108-585: Latvian Naval Forces ( Latvian : Latvijas Jūras spēki ) is the naval warfare branch of the National Armed Forces . It is tasked with conducting military, search and rescue operations, mine and explosive sweeping on the Baltic Sea , as well as ecological monitoring activities. The Naval Forces have participated in international NATO / Partnership for Peace operations and various exercises with great success. The main development priorities of
216-650: A caron , ⟨č, š, ž⟩ , they are pronounced [tʃ] , [ʃ] and [ʒ] respectively. The letters ⟨ģ, ķ, ļ, ņ⟩ , written with a comma placed underneath (or above them for lowercase g ), which indicate palatalized versions of ⟨g, k, l, n⟩ representing the sounds [ɟ] , [c] , [ʎ] and [ɲ] . Latvian orthography also contains nine digraphs, which are written ⟨ai, au, ei, ie, iu, ui, oi, dz, dž⟩ . Non-standard varieties of Latvian add extra letters to this standard set. Latvian spelling has almost one-to-one correspondence between graphemes and phonemes. Every phoneme corresponds to
324-520: A dead key (usually ', occasionally ~). Some keyboard layouts use the modifier key AltGr (most notably the Windows 2000 and XP built-in layout (Latvian QWERTY), it is also default modifier in X11R6, thus a default in most Linux distributions). In the 1990s, lack of software support of diacritics caused an unofficial style of orthography, often called translits , to emerge for use in situations when
432-757: A broad system of education in Russian existed). The Official Language Law was adopted on 9 December 1999. Several regulatory acts associated with this law have been adopted. Observance of the law is monitored by the Latvian State Language Center run by the Ministry of Justice. To counter the influence of English , government organizations (namely the Terminology Commission of the Latvian Academy of Science and
540-486: A cedilla; and the postalveolars Š , Č and Ž are written with h replacing the háček , as in English. Sometimes the second letter, the one used instead of a diacritic, is changed to one of two other diacritic letters (e.g. š is written as ss or sj, not sh), and since many people may find it difficult to use these unusual methods, they write without any indication of missing diacritic marks, or they use digraphing only if
648-420: A chemically pure compound, such as nitroglycerin , or a mixture of a fuel and an oxidizer , such as black powder or grain dust and air. Some chemical compounds are unstable in that, when shocked, they react, possibly to the point of detonation. Each molecule of the compound dissociates into two or more new molecules (generally gases) with the release of energy. The above compositions may describe most of
756-405: A child, Kuldi Medne, born in 2020 is reported to be a native speaker of Livonian. Her parents are Livonian language revival activists Jānis Mednis and Renāte Medne. The Latvian Government continued attempts to preserve the dialect following the restoration of independence in 1990 and currently it is learned by some people as a hobby. The Central dialect spoken in central and Southwestern Latvia
864-933: A classic Indo-European (Baltic) system with well developed inflection and derivation. Word stress, with some exceptions in derivation and inflection, more often is on the first syllable . There are no articles in Latvian; definiteness is expressed by an inflection of adjectives. Basic word order in Latvian is subject–verb–object ; however, word order is relatively free. There are two grammatical genders in Latvian (masculine and feminine) and two numbers , singular and plural. Nouns, adjectives, and declinable participles decline into seven cases: nominative , genitive , dative , accusative , instrumental , locative , and vocative . There are six declensions for nouns. There are three conjugation classes in Latvian. Verbs are conjugated for person, tense, mood and voice. Latvian in Latin script
972-634: A degree of water resistance. Explosives based on ammonium nitrate have little or no water resistance as ammonium nitrate is highly soluble in water and is hygroscopic. Many explosives are toxic to some extent. Manufacturing inputs can also be organic compounds or hazardous materials that require special handling due to risks (such as carcinogens ). The decomposition products, residual solids, or gases of some explosives can be toxic, whereas others are harmless, such as carbon dioxide and water. Examples of harmful by-products are: "Green explosives" seek to reduce environment and health impacts. An example of such
1080-458: A further eleven characters by modification. The vowel letters ⟨ a ⟩ , ⟨ e ⟩ , ⟨ i ⟩ and ⟨ u ⟩ can take a macron to show length, unmodified letters being short; these letters are not differentiated while sorting (e.g. in dictionaries). The letters ⟨ c ⟩ , ⟨ s ⟩ and ⟨ z ⟩ are pronounced [ts] , [s] and [z] respectively, while when marked with
1188-478: A language of its size, whereby many non-native speakers speak it compared to native speakers. The immigrant and minority population in Latvia is 700,000 people: Russians , Belarusians , Ukrainians , Poles , and others. The majority of immigrants settled in Latvia between 1940 and 1991; supplementing pre-existing ethnic minority communities ( Latvian Germans , Latvian Jews , Latvian Russians ). The trends show that
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#17328022490001296-603: A letter so that the reader can almost always pronounce words by putting the letters together. There are only two exceptions to this consistency in the orthography: the letters ⟨e, ē⟩ represent two different sounds: /ɛ æ/ and /ɛː æː/ . The second mismatch is that letter ⟨o⟩ indicates both the short and long [ɔ] , and the diphthong [uɔ] . These three sounds are written as ⟨o⟩ , ⟨ō⟩ and ⟨uo⟩ in Standard Latgalian , and some Latvians campaign for
1404-728: A mine off Riga on October 29 1917. She was raised in 1918 and taken back to Riga for repairs, but was later seized by forces of the Latvian Socialist Soviet Republic in 1919, before being recaptured by Germany. Upon the conclusion of the Latvian War of Independence , and the victory of the Latvian Provisional Government , M68 was formally commissioned into the Latvian Naval Forces as Virsaitis . She would remain
1512-646: A more rapid development. In addition, there is some disagreement whether Standard Latgalian and Kursenieki , which are mutually intelligible with Latvian, should be considered varieties or separate languages . However, in Latvian linguistics, such hypotheses have been rejected as non-scientific. Latvian first appeared in print in the mid-16th century with the reproduction of the Lord's Prayer in Latvian in Sebastian Münster 's Cosmographia universalis (1544), in Latin script . Latvian belongs to
1620-433: A number of more exotic explosive materials, and exotic methods of causing explosions. Examples include nuclear explosives , and abruptly heating a substance to a plasma state with a high-intensity laser or electric arc . Laser- and arc-heating are used in laser detonators, exploding-bridgewire detonators , and exploding foil initiators , where a shock wave and then detonation in conventional chemical explosive material
1728-685: A practical measure, primary explosives are sufficiently sensitive that they can be reliably initiated with a blow from a hammer; however, PETN can also usually be initiated in this manner, so this is only a very broad guideline. Additionally, several compounds, such as nitrogen triiodide , are so sensitive that they cannot even be handled without detonating. Nitrogen triiodide is so sensitive that it can be reliably detonated by exposure to alpha radiation . Primary explosives are often used in detonators or to trigger larger charges of less sensitive secondary explosives . Primary explosives are commonly used in blasting caps and percussion caps to translate
1836-461: A radical vowel, a short vowel in the suffix, and vowel with a diacritic mark in the ending indicating two accents. Consonants were written using multiple letters following the example of German. The old orthography was used until the 20th century when modern orthography slowly replaced it. In late 1992, the official Latvian computing standard LVS 8-92 took effect. It was followed by LVS 24-93 (Latvian language support for computers) that also specified
1944-399: A reaction to be classified as a detonation as opposed to just a deflagration, the propagation of the reaction shockwave through the material being tested must be faster than the speed of sound through that material. The speed of sound through a liquid or solid material is usually orders of magnitude faster than the speed of sound through air or other gases. Traditional explosives mechanics
2052-735: A smaller number are manufactured specifically for the purpose of being used as explosives. The remainder are too dangerous, sensitive, toxic, expensive, unstable, or prone to decomposition or degradation over short time spans. In contrast, some materials are merely combustible or flammable if they burn without exploding. The distinction, however, is not very clear. Certain materials—dusts, powders, gases, or volatile organic liquids—may be simply combustible or flammable under ordinary conditions, but become explosive in specific situations or forms, such as dispersed airborne clouds , or confinement or sudden release . Early thermal weapons , such as Greek fire , have existed since ancient times. At its roots,
2160-618: A thermodynamically favorable process in addition to one that propagates very rapidly. Thus, explosives are substances that contain a large amount of energy stored in chemical bonds . The energetic stability of the gaseous products and hence their generation comes from the formation of strongly bonded species like carbon monoxide, carbon dioxide, and nitrogen gas, which contain strong double and triple bonds having bond strengths of nearly 1 MJ/mole. Consequently, most commercial explosives are organic compounds containing –NO 2 , –ONO 2 and –NHNO 2 groups that, when detonated, release gases like
2268-605: A unified political, economic, and religious space in Medieval Livonia . The oldest known examples of written Latvian are from a 1530 translation of a hymn made by Nikolaus Ramm [ lv ] , a German pastor in Riga . The oldest preserved book in Latvian is a 1585 Catholic catechism of Petrus Canisius currently located at the Uppsala University Library . The first person to translate
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#17328022490002376-709: Is mining . Whether the mine is on the surface or is buried underground, the detonation or deflagration of either a high or low explosive in a confined space can be used to liberate a fairly specific sub-volume of a brittle material (rock) in a much larger volume of the same or similar material. The mining industry tends to use nitrate-based explosives such as emulsions of fuel oil and ammonium nitrate solutions, mixtures of ammonium nitrate prills (fertilizer pellets) and fuel oil ( ANFO ) and gelatinous suspensions or slurries of ammonium nitrate and combustible fuels. In materials science and engineering, explosives are used in cladding ( explosion welding ). A thin plate of some material
2484-782: Is a standard language , i.e., the Standard Latgalian, another historic variety of Latvian, which is based on deep non-Selonic varieties spoken in the south of Latgale . The term "Latgalic" is sometimes also applied to all non-Selonic varieties or even the whole dialect. However, it is unclear if using the term for any varieties besides the standard language is accurate. While the term may refer to varieties spoken in Latgale or by Latgalians , not all speakers identify as speaking Latgalic, for example, speakers of deep Non-Selonic varieties in Vidzeme explicitly deny speaking Latgalic. It
2592-427: Is a pure substance ( molecule ) that in a chemical reaction can contribute some atoms of one or more oxidizing elements, in which the fuel component of the explosive burns. On the simplest level, the oxidizer may itself be an oxidizing element , such as gaseous or liquid oxygen . The availability and cost of explosives are determined by the availability of the raw materials and the cost, complexity, and safety of
2700-495: Is also used. There are several contests held annually to promote the correct use of Latvian. One of them is "Word of the year" ( Gada vārds ) organized by the Riga Latvian Society since 2003. It features categories such as the "Best word", "Worst word", "Best saying" and " Word salad ". In 2018 the word zibmaksājums ( instant payment ) won the category of "Best word" and influenceris ( influencer ) won
2808-594: Is an East Baltic language belonging to the Indo-European language family and it is spoken in the Baltic region . It is the language of Latvians and the official language of Latvia as well as one of the official languages of the European Union . There are about 1.5 million native Latvian speakers in Latvia and 100,000 abroad. Altogether, 2 million, or 80% of the population of Latvia, spoke Latvian in
2916-402: Is an important consideration in selecting an explosive for a particular purpose. The explosive in an armor-piercing projectile must be relatively insensitive, or the shock of impact would cause it to detonate before it penetrated to the point desired. The explosive lenses around nuclear charges are also designed to be highly insensitive, to minimize the risk of accidental detonation. The index of
3024-440: Is an important element influencing the yield of the energy transmitted for both atmospheric over-pressure and ground acceleration. By definition, a "low explosive", such as black powder, or smokeless gunpowder has a burn rate of 171–631 m/s. In contrast, a "high explosive", whether a primary, such as detonating cord , or a secondary, such as TNT or C-4, has a significantly higher burn rate about 6900–8092 m/s. Stability
3132-520: Is based on the shock-sensitive rapid oxidation of carbon and hydrogen to carbon dioxide, carbon monoxide and water in the form of steam. Nitrates typically provide the required oxygen to burn the carbon and hydrogen fuel. High explosives tend to have the oxygen, carbon and hydrogen contained in one organic molecule, and less sensitive explosives like ANFO are combinations of fuel (carbon and hydrogen fuel oil) and ammonium nitrate . A sensitizer such as powdered aluminum may be added to an explosive to increase
3240-443: Is created by laser- or electric-arc heating. Laser and electric energy are not currently used in practice to generate most of the required energy, but only to initiate reactions. To determine the suitability of an explosive substance for a particular use, its physical properties must first be known. The usefulness of an explosive can only be appreciated when the properties and the factors affecting them are fully understood. Some of
3348-452: Is evaluated by a tailored series of tests to assess the material for its intended use. Of the tests listed below, cylinder expansion and air-blast tests are common to most testing programs, and the others support specific applications. In addition to strength, explosives display a second characteristic, which is their shattering effect or brisance (from the French meaning to "break"). Brisance
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3456-472: Is important in determining the effectiveness of an explosion in fragmenting shells, bomb casings, and grenades . The rapidity with which an explosive reaches its peak pressure ( power ) is a measure of its brisance. Brisance values are primarily employed in France and Russia. The sand crush test is commonly employed to determine the relative brisance in comparison to TNT. No test is capable of directly comparing
3564-400: Is placed atop a thick layer of a different material, both layers typically of metal. Atop the thin layer is placed an explosive. At one end of the layer of explosive, the explosion is initiated. The two metallic layers are forced together at high speed and with great force. The explosion spreads from the initiation site throughout the explosive. Ideally, this produces a metallurgical bond between
3672-479: Is pronounced as /sː/ , šs and žs as /ʃː/ . Latvian has six vowels, with length as distinctive feature: /ɔ ɔː/ , and the diphthongs involving it other than /uɔ/ , are confined to loanwords. Latvian also has 10 diphthongs , four of which are only found in loanwords ( /ai ui ɛi au iɛ uɔ iu (ɔi) ɛu (ɔu)/ ), although some diphthongs are mostly limited to proper names and interjections. Standard Latvian and, with some exceptions in derivation and inflection, all of
3780-418: Is spoken by approximately 15% of Latvia's population, but almost all of its speakers are also fluent in the standard Latvian language and they promote the dialect in popular culture in order to preserve their distinct culture. The Latvian Government since 1990 has also taken measures to protect the dialect from extinction. The history of the Latvian language (see below) has placed it in a peculiar position for
3888-473: Is the ability of an explosive to be stored without deterioration . The following factors affect the stability of an explosive: The term power or performance as applied to an explosive refers to its ability to do work. In practice it is defined as the explosive's ability to accomplish what is intended in the way of energy delivery (i.e., fragment projection, air blast, high-velocity jet, underwater shock and bubble energy, etc.). Explosive power or performance
3996-728: Is the basis of standard Latvian. The dialect is divided into the Vidzeme variety, the Curonic variety and the Semigallic variety. The Vidzeme variety and the Semigallic variety are closer to each other than to the Curonic variety, which is more archaic than the other two. There are three syllable intonations in some parts of Vidzeme variety of the Central dialect, extended, broken and falling. The Curonic and Semigallic varieties have two syllable intonations, extended and broken, but some parts of
4104-411: Is the lead-free primary explosive copper(I) 5-nitrotetrazolate, an alternative to lead azide . Explosive material may be incorporated in the explosive train of a device or system. An example is a pyrotechnic lead igniting a booster, which causes the main charge to detonate. The most widely used explosives are condensed liquids or solids converted to gaseous products by explosive chemical reactions and
4212-407: Is used to describe an explosive phenomenon whereby the decomposition is propagated by a shock wave traversing the explosive material at speeds greater than the speed of sound within the substance. The shock front is capable of passing through the high explosive material at supersonic speeds — typically thousands of metres per second. In addition to chemical explosives, there are
4320-629: The Indo-European language family. It is classified as a part of the Baltic branch of the family. It is one of two living Baltic languages with an official status, the other being Lithuanian . The Latvian and Lithuanian languages have retained many features of the nominal morphology of Proto-Indo-European , though their phonology and verbal morphology show many innovations (in other words, forms that did not exist in Proto-Indo-European), with Latvian being considerably more innovative than Lithuanian. However, Latvian has mutual influences with
4428-580: The Livonian , Curonian , Semigallian and Selonian languages. The Livonic dialect (also called Tamian or tāmnieku ) of Latvian was more affected by the Livonian language substratum than Latvian in other parts of Latvia. It is divided into the Vidzeme variety and the Courland variety (also called tāmnieku ). There are two syllable intonations in the Livonic dialect, extended and broken. In
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4536-462: The Livonian language . According to some glottochronological speculations, the East Baltic languages split from West Baltic (or, perhaps, from the hypothetical proto-Baltic language ) between 400 and 600 CE. The differentiation between Lithuanian and Latvian started after 800 CE. At a minimum, transitional dialects existed until the 14th century or 15th century, and perhaps as late as
4644-699: The Windows-1252 coding, it is possible to input those two letters using a numerical keypad . Latvian language code for cmd and .bat files - Windows-1257 For example, the Lord's Prayer in Latvian written in different styles: Consonants in consonant sequences assimilate to the voicing of the subsequent consonant , e.g. a p gabals [ˈa b ɡabals] or la b s [ˈla p s] . Latvian does not feature final-obstruent devoicing . Consonants can be long (written as double consonants) mamma [ˈmamːa] , or short. Plosives and fricatives occurring between two short vowels are lengthened: upe [ˈupːe] . Same with 'zs' that
4752-524: The 17th century. Latvian as a distinct language emerged over several centuries from the language spoken by the ancient Latgalians assimilating the languages of other neighboring Baltic tribes— Curonian , Semigallian , and Selonian —which resulted in these languages gradually losing their most distinct characteristics. This process of consolidation started in the 13th century after the Livonian Crusade and forced christianization , which formed
4860-574: The 19th century, the Latvian written language was influenced by German Lutheran pastors and the German language , because Baltic Germans formed the upper class of local society. In the middle of the 19th century the First Latvian National Awakening was started, led by " Young Latvians " who popularized the use of Latvian language. Participants in this movement laid the foundations for standard Latvian and also popularized
4968-510: The 2000s, before the total number of inhabitants of Latvia slipped to 1.8 million in 2022. Of those, around 1.16 million or 62% of Latvia's population used it as their primary language at home, though excluding the Latgale and Riga regions it is spoken as a native language in villages and towns by over 90% of the population. As a Baltic language , Latvian is most closely related to neighboring Lithuanian (as well as Old Prussian , an extinct Baltic language); however, Latvian has followed
5076-420: The 2011 census Latvian was the language spoken at home by 62% of the country's population. After the re-establishment of independence in 1991, a new policy of language education was introduced. The primary declared goal was the integration of all inhabitants into the environment of the official state language while protecting the languages of Latvia's ethnic minorities. Government-funded bilingual education
5184-698: The Bible into Latvian was the German Lutheran pastor Johann Ernst Glück ( The New Testament in 1685 and The Old Testament in 1691). The Lutheran pastor Gotthard Friedrich Stender was a founder of Latvian secular literature. He wrote the first illustrated Latvian alphabet book (1787), the first encyclopedia " The Book of High Wisdom of the World and Nature [ lv ] " ( Augstas gudrības grāmata no pasaules un dabas ; 1774), grammar books and Latvian–German and German–Latvian dictionaries. Until
5292-544: The Latvian Naval Forces Southern Region have participated in numerous international exercises (U.S. BALTOPS , COOPERATIVE JAGUAR, AMBER SEA, OPEN SPIRIT, etc.). These exercises have been conducted to NATO standards, which Latvian ships have successfully met. The main tasks of Naval Forces are to: Latvian language Latvian ( endonym : latviešu valoda , pronounced [ˈlatviɛʃu ˈvaluɔda] ), also known as Lettish ,
5400-477: The Latvian Navy's only warship until 1926. In 1926, two new Viesturs -class minesweepers , Viesturs and Imanta were ordered from France and commissioned later that year. The same year, two Ronis -class submarines ; Ronis and Spīdola , also ordered from France, were commissioned. A sixth vessel, the former German icebreaker Passat became the submarine tender Varonis . The six ships consisted of
5508-417: The Latvian dialects have fixed initial stress. Long vowels and diphthongs have a tone, regardless of their position in the word. This includes the so-called "mixed diphthongs" composed of a short vowel followed by a sonorant . During the period of Livonia , many Middle Low German words such as amats (profession), dambis (dam), būvēt (to build) and bikses (trousers) were borrowed into Latvian, while
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#17328022490005616-454: The Latvian language phonemically. Initially, it was used to write religious texts for German priests to help them in their work with Latvians. The first writings in Latvian were chaotic: twelve variations of writing Š . In 1631 the German priest Georg Mancelius tried to systematize the writing. He wrote long vowels according to their position in the word – a short vowel followed by h for
5724-472: The Latvian-speaking linguistic majority and for the sake of facilitating academic and professional achievements. Since the mid-1990s, the government may pay a student's tuition in public universities only provided that the instruction is in Latvian. Since 2004, the state mandates Latvian as the language of instruction in public secondary schools (Form 10–12) for at least 60% of class work (previously,
5832-543: The Latvianization of loan words. However, in the 1880s, when Czar Alexander III came into power, Russification started. According to the 1897 Imperial Russian Census , there were 505,994 (75.1%) speakers of Latvian in the Governorate of Courland and 563,829 (43.4%) speakers of Latvian in the Governorate of Livonia , making Latvian-speakers the largest linguistic group in each of the governorates. After
5940-398: The Livonic dialect, short vowels at the end of words are discarded, while long vowels are shortened. In all numbers, only one form of the verb is used. Due to migration and the introduction of a standardised language, this dialect has declined. It arose from assimilated Livonians , who started to speak in Latvian. Although initially its last native speaker, Grizelda Kristiņa , died in 2013,
6048-621: The Naval Forces Headquarters, Naval Forces Flotilla HQ with subunits and the Coast Guard Service. The new structure organizes personnel training and specialization better than before, as well as shares greater responsibility between commanders. As part of the program to equip the Naval Forces with modern assets, the first of a new generation of nationally made patrol vessels, made with German assistance,
6156-479: The Naval Forces are to expand their activities within the Baltic States ’ Ship Squadron BALTRON and to develop a Sea Surveillance System. They pay a great deal of attention to professionally specialized training and English-language teaching. The Latvian Naval Forces were founded on 10 August 1919 with its first ship being the former Imperial German minesweeper SMS M68 . Previously, M68 had been sunk by
6264-796: The Naval Forces were composed of the Southern Region (in Liepāja ), the Central Region (in Riga ), the Coastal Defense Battalion (in Ventspils ) and the Training Center (in Liepāja ). The most important naval event of these early days of the re-established Latvian Republic occurred on 11 April 1991 when the Latvian flag was hoisted on the re-established Navy's first ship "SAMS". This date is now recognized as
6372-462: The Soviet Union followed, primarily as a result of Stalin's plan to integrate Latvia and the other Baltic republics into the Soviet Union through colonization . As a result, the proportion of the ethnic Latvian population within the total population was reduced from 80% in 1935 to 52% in 1989. In Soviet Latvia, most of the immigrants who settled in the country did not learn Latvian. According to
6480-601: The State Language Center) popularize the use of Latvian terms. A debate arose over the Latvian term for euro . The Terminology Commission suggested eira or eirs , with their Latvianized and declinable ending, would be a better term for euro than the widely used eiro , while European Central Bank insisted that the original name euro be used in all languages. New terms are Latvian derivatives, calques or new loanwords. For example, Latvian has two words for "telephone"— tālrunis and telefons ,
6588-645: The Vidzeme variety has extended and falling intonations. In the Curonic variety, ŗ is still used. The Kursenieki language , a historic variety of Latvian, which used to be spoken along Curonian Spit , is closely related to the varieties of the Central dialect spoken in Courland . High Latvian dialect is spoken in Eastern Latvia. It is set apart from the rest of the Latvian by a number of phonological differences. The dialect has two main varieties – Selonic (two syllable intonations, falling and rising) and Non-Selonic (falling and broken syllable intonations). There
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#17328022490006696-412: The adoption of this system in standard Latvian. However, Latvian grammarians argue that ⟨o⟩ and ⟨ō⟩ are found only in loanwords, with the /uɔ/ sound being the only native Latvian phoneme. The digraph ⟨uo⟩ was discarded in 1914, and the letters ⟨ō⟩ and ⟨ŗ⟩ have not been used in the official Latvian language since 1946. Likewise,
6804-413: The aforementioned (e.g., nitroglycerin , TNT , HMX , PETN , nitrocellulose ). An explosive is classified as a low or high explosive according to its rate of combustion : low explosives burn rapidly (or deflagrate ), while high explosives detonate . While these definitions are distinct, the problem of precisely measuring rapid decomposition makes practical classification of explosives difficult. For
6912-479: The capacity of an explosive to be initiated into detonation in a sustained manner. It is defined by the power of the detonator which is certain to prime the explosive to a sustained and continuous detonation. Reference is made to the Sellier-Bellot scale that consists of a series of 10 detonators, from n. 1 to n. 10 , each of which corresponds to an increasing charge weight. In practice, most of
7020-474: The category of "Worst word". The word pair of straumēt ( stream ) and straumēšana (streaming) were named the best words of 2017, while transporti as an unnecessary plural of the name for transport was chosen as the worst word of 2017. There are three dialects in Latvian: the Livonic dialect, High Latvian and the Central dialect. Latvian dialects and their varieties should not be confused with
7128-486: The chemical reaction moves faster through the material than the speed of sound ) are said to be "high explosives" and materials that deflagrate are said to be "low explosives". Explosives may also be categorized by their sensitivity . Sensitive materials that can be initiated by a relatively small amount of heat or pressure are primary explosives and materials that are relatively insensitive are secondary or tertiary explosives . A wide variety of chemicals can explode;
7236-425: The choice being determined by the characteristics of the explosive. Dependent upon the method employed, an average density of the loaded charge can be obtained that is within 80–99% of the theoretical maximum density of the explosive. High load density can reduce sensitivity by making the mass more resistant to internal friction . However, if density is increased to the extent that individual crystals are crushed,
7344-449: The country's only official language and other changes in the society after the fall of the Soviet Union that mostly shifted linguistic focus away from Russian . As an example, in 2007, universities and colleges for the first time received applications from prospective students who had a bilingual secondary education in schools for minorities. Fluency in Latvian is expected in a variety of professions and careers. Latvian grammar represents
7452-465: The death of Alexander III at the end of the 19th century, Latvian nationalist movements re-emerged. In 1908, Latvian linguists Kārlis Mīlenbahs and Jānis Endzelīns elaborated the modern Latvian alphabet, which slowly replaced the old orthography used before. Another feature of the language, in common with its sister language Lithuanian, that was developed at that time is that proper names from other countries and languages are altered phonetically to fit
7560-421: The development of pressure within rounds of ammunition and separation of mixtures into their constituents. Volatility affects the chemical composition of the explosive such that a marked reduction in stability may occur, which results in an increase in the danger of handling. The introduction of water into an explosive is highly undesirable since it reduces the sensitivity, strength, and velocity of detonation of
7668-448: The diacritic mark in question would make a semantic difference. Sometimes an apostrophe is used before or after the character that would properly need to be diacriticised. Also, digraph diacritics are often used and sometimes even mixed with diacritical letters of standard orthography. Although today there is software support available, diacritic-less writing is still sometimes used for financial and social reasons. As š and ž are part of
7776-423: The digraph ⟨ch⟩ was discarded in 1957, although ⟨ō⟩ , ⟨ŗ⟩ , and ⟨ch⟩ are still used in some varieties and by many Latvians living beyond the borders of Latvia. The letter ⟨y⟩ is used only in Standard Latgalian, where it represents / ɨ / , a sound not present in other dialects. The old orthography was based on German and did not represent
7884-498: The energy of the detonation. Once detonated, the nitrogen portion of the explosive formulation emerges as nitrogen gas and toxic nitric oxides . The chemical decomposition of an explosive may take years, days, hours, or a fraction of a second. The slower processes of decomposition take place in storage and are of interest only from a stability standpoint. Of more interest are the other two rapid forms besides decomposition: deflagration and detonation. In deflagration, decomposition of
7992-604: The energy released by those reactions. The gaseous products of complete reaction are typically carbon dioxide , steam , and nitrogen . Gaseous volumes computed by the ideal gas law tend to be too large at high pressures characteristic of explosions. Ultimate volume expansion may be estimated at three orders of magnitude, or one liter per gram of explosive. Explosives with an oxygen deficit will generate soot or gases like carbon monoxide and hydrogen , which may react with surrounding materials such as atmospheric oxygen . Attempts to obtain more precise volume estimates must consider
8100-535: The entirety of the Latvian Naval Forces during its first incarnation, as The Great Depression hindered further expansion. The Navy saw no action during its early existence. In August 1940, the Soviet Union invaded and occupied Latvia , and thus, seized all six Latvian warships. All were incorporated into the Baltic Fleet . Both submarines retained their names, but Virsaitis was renamed T-297 (her name
8208-562: The evacuation of the Soviet garrison on the Hanko Peninsula in late 1941. On December 2 1941, she struck a mine and sank off Hanko. T-298 was the only former Latvian warship to survive World War II and was later converted to a survey ship in 1948. Her final fate is unknown. When Latvia regained its independence in 1991, it began recreating the Latvian Naval Forces under the command of Admiral (then Captain) Gaidis Zeibots . In 1994
8316-445: The explosive material is propagated by a flame front which moves relatively slowly through the explosive material, i.e. at speeds less than the speed of sound within the substance (which is usually still higher than 340 m/s or 1,220 km/h in most liquid or solid materials) in contrast to detonation, which occurs at speeds greater than the speed of sound. Deflagration is a characteristic of low explosive material. This term
8424-651: The explosive material, but a practical explosive will often include small percentages of other substances. For example, dynamite is a mixture of highly sensitive nitroglycerin with sawdust , powdered silica , or most commonly diatomaceous earth , which act as stabilizers. Plastics and polymers may be added to bind powders of explosive compounds; waxes may be incorporated to make them safer to handle; aluminium powder may be introduced to increase total energy and blast effects. Explosive compounds are also often "alloyed": HMX or RDX powders may be mixed (typically by melt-casting) with TNT to form Octol or Cyclotol . An oxidizer
8532-442: The explosive may become more sensitive. Increased load density also permits the use of more explosive, thereby increasing the power of the warhead . It is possible to compress an explosive beyond a point of sensitivity, known also as dead-pressing , in which the material is no longer capable of being reliably initiated, if at all. Volatility is the readiness with which a substance vaporizes . Excessive volatility often results in
8640-414: The explosive properties of two or more compounds; it is important to examine the data from several such tests (sand crush, trauzl , and so forth) in order to gauge relative brisance. True values for comparison require field experiments. Density of loading refers to the mass of an explosive per unit volume. Several methods of loading are available, including pellet loading, cast loading, and press loading,
8748-409: The explosive. Hygroscopicity is a measure of a material's moisture-absorbing tendencies. Moisture affects explosives adversely by acting as an inert material that absorbs heat when vaporized, and by acting as a solvent medium that can cause undesired chemical reactions. Sensitivity, strength, and velocity of detonation are reduced by inert materials that reduce the continuity of the explosive mass. When
8856-429: The explosives on the market today are sensitive to an n. 8 detonator, where the charge corresponds to 2 grams of mercury fulminate . The velocity with which the reaction process propagates in the mass of the explosive. Most commercial mining explosives have detonation velocities ranging from 1,800 m/s to 8,000 m/s. Today, velocity of detonation can be measured with accuracy. Together with density it
8964-413: The first time in warfare. The Chinese would incorporate explosives fired from bamboo or bronze tubes known as bamboo firecrackers. The Chinese also inserted live rats inside the bamboo firecrackers; when fired toward the enemy, the flaming rats created great psychological ramifications—scaring enemy soldiers away and causing cavalry units to go wild. The first useful explosive stronger than black powder
9072-432: The former being a direct translation into Latvian of the latter international term. Still, others are older or more euphonic loanwords rather than Latvian words. For example, "computer" can be either dators or kompjūters . Both are loanwords; the native Latvian word for "computer" is skaitļotājs , which is also an official term. However, now dators has been considered an appropriate translation, skaitļotājs
9180-532: The history of chemical explosives lies in the history of gunpowder . During the Tang dynasty in the 9th century, Taoist Chinese alchemists were eagerly trying to find the elixir of immortality. In the process, they stumbled upon the explosive invention of black powder made from coal, saltpeter, and sulfur in 1044. Gunpowder was the first form of chemical explosives and by 1161, the Chinese were using explosives for
9288-450: The manufacturing operations. A primary explosive is an explosive that is extremely sensitive to stimuli such as impact , friction , heat , static electricity , or electromagnetic radiation . Some primary explosives are also known as contact explosives . A relatively small amount of energy is required for initiation . As a very general rule, primary explosives are considered to be those compounds that are more sensitive than PETN . As
9396-436: The moisture content evaporates during detonation, cooling occurs, which reduces the temperature of reaction. Stability is also affected by the presence of moisture since moisture promotes decomposition of the explosive and, in addition, causes corrosion of the explosive's metal container. Explosives considerably differ from one another as to their behavior in the presence of water. Gelatin dynamites containing nitroglycerine have
9504-443: The molecule is said to have a zero oxygen balance. The molecule is said to have a positive oxygen balance if it contains more oxygen than is needed and a negative oxygen balance if it contains less oxygen than is needed. The sensitivity, strength , and brisance of an explosive are all somewhat dependent upon oxygen balance and tend to approach their maxima as oxygen balance approaches zero. A chemical explosive may consist of either
9612-457: The more important characteristics are listed below: Sensitivity refers to the ease with which an explosive can be ignited or detonated, i.e., the amount and intensity of shock , friction , or heat that is required. When the term sensitivity is used, care must be taken to clarify what kind of sensitivity is under discussion. The relative sensitivity of a given explosive to impact may vary greatly from its sensitivity to friction or heat. Some of
9720-686: The period of Swedish Livonia brought loanwords like skurstenis (chimney) from Swedish . It also has loanwords from the Finnic languages , mainly from Livonian and Estonian . There are about 500 to 600 borrowings from Finnic languages in Latvian, for example: māja ‘house’ (Liv. mōj ), puika ‘boy’ (Liv. pūoga ), pīlādzis ‘mountain ash’ (Liv. pī’lõg ), sēne ‘mushroom’ (Liv. sēņ ). Loanwords from other Baltic language include ķermenis (body) from Old Prussian , as well as veikals (store) and paģiras (hangover) from Lithuanian . The first Latvian dictionary Lettus compiled by Georg Mancelius
9828-562: The phonological system of Latvian, even if the original language also uses the Latin alphabet. Moreover, the names are modified to ensure that they have noun declension endings, declining like all other nouns. For example, a place such as Lecropt (a Scottish parish) is likely to become Lekropta; the Scottish village of Tillicoultry becomes Tilikutrija. After the Soviet occupation of Latvia ,
9936-706: The policy of Russification greatly affected the Latvian language. At the same time, the use of Latvian among the Latvians in Russia had already dwindled after the so-called 1937–1938 Latvian Operation of the NKVD , during which at least 16,573 ethnic Latvians and Latvian nationals were executed. In the 1941 June deportation and the 1949 Operation Priboi , tens of thousands of Latvians and other ethnicities were deported from Latvia. Massive immigration from Russian SFSR , Ukrainian SSR , Byelorussian SSR , and other republics of
10044-410: The possibility of such side reactions, condensation of steam, and aqueous solubility of gases like carbon dioxide. Oxygen balance is an expression that is used to indicate the degree to which an explosive can be oxidized. If an explosive molecule contains just enough oxygen to convert all of its carbon to carbon dioxide, all of its hydrogen to water, and all of its metal to metal oxide with no excess,
10152-426: The production of light , heat , sound , and pressure . An explosive charge is a measured quantity of explosive material, which may either be composed solely of one ingredient or be a mixture containing at least two substances. The potential energy stored in an explosive material may, for example, be: Explosive materials may be categorized by the speed at which they expand. Materials that detonate (the front of
10260-480: The proficiency of Latvian among its non-native speakers is gradually increasing. In a 2009 survey by the Latvian Language Agency 56% percent of respondents with Russian as their native language described having a good knowledge of Latvian, whereas for the younger generation (from 17 to 25 years) the number was 64%. The increased adoption of Latvian by minorities was brought about by its status as
10368-729: The rebirth of the Latvian Naval Forces. In 1999 the Baltic Naval Squadron ( BALTRON ) was created with ships from the Lithuanian , Latvian and Estonian Navies. Latvian Navy Captain Ilmars Lesinskis, then the Commander of the Southern District, was appointed to serve as the first commander of this multi-national force. On 1 July 1999 Latvian Naval Forces were reorganized. The present structure
10476-492: The sum of the masses of the two initial layers. There are applications where a shock wave, and electrostatics, can result in high velocity projectiles such as in an electrostatic particle accelerator . An explosion is a type of spontaneous chemical reaction that, once initiated, is driven by both a large exothermic change (great release of heat) and a large positive entropy change (great quantities of gases are released) in going from reactants to products, thereby constituting
10584-499: The test methods used to determine sensitivity relate to: Specific explosives (usually but not always highly sensitive on one or more of the three above axes) may be idiosyncratically sensitive to such factors as pressure drop, acceleration, the presence of sharp edges or rough surfaces, incompatible materials, or even — in rare cases — nuclear or electromagnetic radiation. These factors present special hazards that may rule out any practical utility. Sensitivity
10692-425: The two layers. As the length of time the shock wave spends at any point is small, we can see mixing of the two metals and their surface chemistries, through some fraction of the depth, and they tend to be mixed in some way. It is possible that some fraction of the surface material from either layer eventually gets ejected when the end of material is reached. Hence, the mass of the now "welded" bilayer, may be less than
10800-477: The user is unable to access Latvian diacritic marks (e-mail, newsgroups, web user forums, chat, SMS etc.). It uses the basic Modern Latin alphabet only, and letters that are not used in standard orthography are usually omitted. In this style, diacritics are replaced by digraphs – a doubled letter indicates a long vowel (as in Finnish and Estonian); a following j indicates palatalisation of consonants, i.e.,
10908-452: The way Latvian language (alphabet, numbers, currency, punctuation marks, date and time) should be represented on computers. A Latvian ergonomic keyboard standard LVS 23-93 was also announced several months later, but it did not gain popularity due to its need for a custom-built keyboard. Nowadays standard QWERTY or the US keyboards are used for writing in Latvian; diacritics are entered by using
11016-799: Was nitroglycerin , developed in 1847. Since nitroglycerin is a liquid and highly unstable, it was replaced by nitrocellulose , trinitrotoluene ( TNT ) in 1863, smokeless powder , dynamite in 1867 and gelignite (the latter two being sophisticated stabilized preparations of nitroglycerin rather than chemical alternatives, both invented by Alfred Nobel ). World War I saw the adoption of TNT in artillery shells. World War II saw extensive use of new explosives (see: List of explosives used during World War II ) . In turn, these have largely been replaced by more powerful explosives such as C-4 and PETN . However, C-4 and PETN react with metal and catch fire easily, yet unlike TNT, C-4 and PETN are waterproof and malleable. The largest commercial application of explosives
11124-429: Was available in primary schools for ethnic minorities until 2019 when Parliament decided on educating only in Latvian. Minority schools are available for Russian , Yiddish , Polish , Lithuanian , Ukrainian , Belarusian , Estonian and Roma schools. Latvian is taught as a second language in the initial stages too, as is officially declared, to encourage proficiency in that language, aiming at avoiding alienation from
11232-961: Was established on the basis of previous regional units – the War Ships Flotilla (HQ is in Liepāja), the Coast Guard Ships Flotilla in Riga (subunits are in Liepāja and Ventspils), the Coastal Defense Battalion in Ventspils (subunits are along the coast of the Baltic Sea and Riga Bay), the Training Center in Liepāja, the Logistic Base in Liepāja (subunits are in Riga and Ventspils). On 1 July 2004 Latvian Naval Forces were reorganized again and since that time they consist of
11340-497: Was first based upon the German orthography , while the alphabet of the Standard Latgalian variety was based on the Polish orthography . At the beginning of the 20th century, it was replaced by a more phonologically consistent orthography. Today, the Latvian standard orthography employs 33 characters: The modern standard Latvian alphabet uses 22 unmodified letters of the Latin alphabet (all except ⟨q, w, x, y⟩ ). It adds
11448-523: Was launched in 2011. The Naval Force provides defense of the national territorial waters, carries out explosive ordnance disposal activities at sea and harbors, co-ordinates and carries out human search and rescue operations at sea within the national responsibility area. Warships of the Republic of Latvia have repeatedly made visits to foreign countries and have supported the visits of foreign warships and naval representatives in Latvia. The warships of
11556-454: Was published in 1638. The first grammar of the Latvian language is a short “Manual on the Latvian language” ( Latin : Manuductio ad linguam lettonicam ) by Johans Georgs Rehehūzens [ lv ] , published in 1644 in Riga. Explosive An explosive (or explosive material ) is a reactive substance that contains a great amount of potential energy that can produce an explosion if released suddenly, usually accompanied by
11664-493: Was restored the following year), Viesturs was renamed T-298 , Imanta was renamed T-299 , and Varonis was renamed Ural. All six ships served in World War II in various roles. Ronis and Spīdola were scuttled in Liepāja on June 24 1941 to prevent their capture by German forces. T-299 struck a mine and sank off Saaremaa on July 1 1941. Ural struck a mine and sank on 28 August 1941. Virsaitis took part in
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