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80-639: Eastern Visayas ( Waray : Sinirangan Kabisay-an ; Cebuano : Sidlakang Kabisay-an ; Tagalog : Silangang Kabisayaan ; Filipino : Silangang Visayas ) is an administrative region in the Philippines , designated as Region VIII . It consists of three main islands: Samar , Leyte , and Biliran . The region has six provinces : Biliran , Leyte , Northern Samar , Samar , Eastern Samar , Southern Leyte , one independent city , Ormoc , and one highly urbanized city , Tacloban (its regional center and largest city). The highly urbanized city of Tacloban

160-703: A Turkish Islamic religious authority in Tacloban at 2017 which teaches the scriptures and offers Friday sermons in both Waray and Cebuano in general. Most Waray dialects have three vowel phonemes: /a/ [a] , /i/ [ɛ~i] and /u/ [ɔ~u] . Some dialects have an additional vowel /ə/ [ə] ; words with /ə/ in these dialects have /u/ in the majority dialects. Waray has a total of 16 consonant phonemes: /p, t, k, b, d, ɡ, m, n, ŋ, s, h, l, ɾ~r, w, j, ʔ/ . Two extra postalveolar sounds [tʃ, dʒ] are heard when /i/ occurs after /t, d/ , further proceeding another vowel sound. Waray, like all Philippine languages today,

240-409: A magnesia nigra (the black ore) from magnesia alba (a white ore, also from Magnesia, also useful in glassmaking). Michele Mercati called magnesia nigra manganesa , and finally the metal isolated from it became known as manganese ( German : Mangan ). The name magnesia eventually was then used to refer only to the white magnesia alba (magnesium oxide), which provided the name magnesium for

320-429: A fungicide. Manganese is also an essential human dietary element, important in macronutrient metabolism, bone formation, and free radical defense systems. It is a critical component in dozens of proteins and enzymes. It is found mostly in the bones, but also the liver, kidneys, and brain. In the human brain, the manganese is bound to manganese metalloproteins , most notably glutamine synthetase in astrocytes . It

400-607: A lesser extent as rhodochrosite ( MnCO 3 ). The most important manganese ore is pyrolusite ( MnO 2 ). Other economically important manganese ores usually show a close spatial relation to the iron ores, such as sphalerite . Land-based resources are large but irregularly distributed. About 80% of the known world manganese resources are in South Africa; other important manganese deposits are in Ukraine, Australia, India, China, Gabon and Brazil. According to 1978 estimate,

480-442: A primitive cubic structure with 20 atoms per unit cell at two types of sites, which is as complex as that of any other elemental metal. It is easily obtained as a metastable phase at room temperature by rapid quenching. It does not show magnetic ordering , remaining paramagnetic down to the lowest temperature measured (1.1 K). Gamma manganese (γ-Mn) forms when heated above 1,370 K (1,100 °C; 2,010 °F). It has

560-447: A simple face-centered cubic structure (four atoms per unit cell). When quenched to room temperature it converts to β-Mn, but it can be stabilized at room temperature by alloying it with at least 5 percent of other elements (such as C, Fe, Ni, Cu, Pd or Au), and these solute-stabilized alloys distort into a face-centered tetragonal structure. Delta manganese (δ-Mn) forms when heated above 1,406 K (1,130 °C; 2,070 °F) and

640-509: A total land area of 2,156,285 hectares (5,328,300 acres) or 7.2% of the country's total land area. 52% of its total land area is classified as forestland and 48% as alienable and disposable land. There are two types of climate prevailing in the region under the Coronas system of classification : Type II and Type IV. Type II climate is characterized by having no dry season but a pronounced maximum rainfall from November to January. Samar Island and

720-436: Is MnO 2 . It is the dark brown pigment of many cave drawings but is also a common ingredient in dry cell batteries. Complexes of Mn(IV) are well known, but they require elaborate ligands . Mn(IV)-OH complexes are an intermediate in some enzymes , including the oxygen evolving center (OEC) in plants. Simple derivatives Mn are rarely encountered but can be stabilized by suitably basic ligands. Manganese(III) acetate

800-466: Is a brown pigment for paint and is a constituent of natural umber . Tetravalent manganese is used as an activator in red-emitting phosphors . While many compounds are known which show luminescence , the majority are not used in commercial application due to low efficiency or deep red emission. However, several Mn activated fluorides were reported as potential red-emitting phosphors for warm-white LEDs. But to this day, only K 2 SiF 6 :Mn

880-552: Is a commonly used laboratory reagent because of its oxidizing properties; it is used as a topical medicine (for example, in the treatment of fish diseases). Solutions of potassium permanganate were among the first stains and fixatives to be used in the preparation of biological cells and tissues for electron microscopy. Aside from various permanganate salts, Mn(VII) is represented by the unstable, volatile derivative Mn 2 O 7 . Oxyhalides (MnO 3 F and MnO 3 Cl) are powerful oxidizing agents . The most prominent example of Mn in

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960-457: Is a hard, brittle, silvery metal, often found in minerals in combination with iron . Manganese was first isolated in the 1770s. It is a transition metal with a multifaceted array of industrial alloy uses, particularly in stainless steels . It improves strength, workability, and resistance to wear. Manganese oxide is used as an oxidising agent; as a rubber additive; and in glass making, fertilisers, and ceramics. Manganese sulfate can be used as

1040-549: Is also seen in the mineral rhodochrosite ( manganese(II) carbonate ). Manganese(II) commonly exists with a high spin, S = 5/2 ground state because of the high pairing energy for manganese(II). There are no spin-allowed d–d transitions in manganese(II), which explain its faint color. Manganese forms a large variety of organometallic derivatives, i.e., compounds with Mn-C bonds. The organometallic derivatives include numerous examples of Mn in its lower oxidation states, i.e. Mn(−III) up through Mn(I). This area of organometallic chemistry

1120-776: Is also used in the Mass in the Roman Catholic Church and in the worship services of different Christian sects in the region. Bibles in Waray are also available. In 2019, the New World Translation of the Holy Scriptures was released in Waray-Waray. However, there is a growing population of Muslims in the region with the first mosque, Tacloban Mosque and Islamic Center, through a charity built by

1200-574: Is an oxidant useful in organic synthesis . Solid compounds of manganese(III) are characterized by its strong purple-red color and a preference for distorted octahedral coordination resulting from the Jahn-Teller effect . A particularly common oxidation state for manganese in aqueous solution is +2, which has a pale pink color. Many manganese(II) compounds are known, such as the aquo complexes derived from manganese(II) sulfate (MnSO 4 ) and manganese(II) chloride (MnCl 2 ). This oxidation state

1280-464: Is attractive because Mn is inexpensive and of relatively low toxicity. Of greatest commercial interest is "MMT", methylcyclopentadienyl manganese tricarbonyl , which is used as an anti-knock compound added to gasoline (petrol) in some countries. It features Mn(I). Consistent with other aspects of Mn(II) chemistry, manganocene ( Mn(C 5 H 5 ) 2 ) is high-spin. In contrast, its neighboring metal iron forms an air-stable, low-spin derivative in

1360-483: Is composed of one stable isotope , Mn. Several radioisotopes have been isolated and described, ranging in atomic weight from 46 u ( Mn) to 72 u ( Mn). The most stable are Mn with a half-life of 3.7 million years, Mn with a half-life of 312.2 days, and Mn with a half-life of 5.591 days. All of the remaining radioactive isotopes have half-lives of less than three hours, and the majority of less than one minute. The primary decay mode in isotopes lighter than

1440-421: Is dominant in a given soil. At pH values less than 6 or under anaerobic conditions, Mn(II) dominates, while under more alkaline and aerobic conditions, Mn(III,IV) oxides and hydroxides predominate. These effects of soil acidity and aeration state on the form of Mn can be modified or controlled by microbial activity. Microbial respiration can cause both the oxidation of Mn to the oxides, and it can cause reduction of

1520-586: Is familiar in the laboratory in the form of the deep violet salt potassium permanganate . It occurs at the active sites in some enzymes . Of particular interest is the use of a Mn-O cluster , the oxygen-evolving complex , in the production of oxygen by plants. Manganese is a silvery-gray metal that resembles iron. It is hard and very brittle, difficult to fuse, but easy to oxidize. Manganese and its common ions are paramagnetic . Manganese tarnishes slowly in air and oxidizes ("rusts") like iron in water containing dissolved oxygen. Naturally occurring manganese

1600-545: Is found throughout the world's oceans, 90% of which originates from hydrothermal vents. Particulate Mn develops in buoyant plumes over an active vent source, while the dMn behaves conservatively. Mn concentrations vary between the water columns of the ocean. At the surface, dMn is elevated due to input from external sources such as rivers, dust, and shelf sediments. Coastal sediments normally have lower Mn concentrations, but can increase due to anthropogenic discharges from industries such as mining and steel manufacturing, which enter

1680-508: Is located in the municipality of Palompon , Leyte province. The Eastern Visayas State University is Leyte 's state university with five extension campuses. Southern Leyte State University with five extension campuses, is the only state university in the province of Southern Leyte . In Biliran , Naval State University is the province state university. For Eastern Samar , the Eastern Samar State University

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1760-458: Is low spin, which contrasts with the high spin character of its precursor, MnBr 2 (dmpe) 2 ( dmpe = (CH 3 ) 2 PCH 2 CH 2 P(CH 3 ) 2 ). Polyalkyl and polyaryl derivatives of manganese often exist in higher oxidation states, reflecting the electron-releasing properties of alkyl and aryl ligands. One example is [Mn(CH 3 ) 6 ] . The origin of the name manganese is complex. In ancient times, two black minerals were identified from

1840-408: Is mainly mined in South Africa, Australia, China, Gabon, Brazil, India, Kazakhstan, Ghana, Ukraine and Malaysia. For the production of ferromanganese , the manganese ore is mixed with iron ore and carbon, and then reduced either in a blast furnace or in an electric arc furnace. The resulting ferromanganese has a manganese content of 30–80%. Pure manganese used for the production of iron-free alloys

1920-675: Is one of the many regional languages found in the Philippines and used in local government. It is widely used in media particularly in television and radio broadcasts, however, not in print media because most regional newspapers are published in English. The language is used in education from kindergarten to primary level as part of the Philippine government's K–12 program since 2012 in which pupils from kindergarten to third grade are taught in their respective indigenous languages. Waray

2000-424: Is primarily an agricultural region with rice , corn , coconut , sugarcane and banana as its major crops. Primary sources of revenue are manufacturing, wholesale and retail trade and services. Mining, farming, fishing and tourism contribute significantly to the economy. Manufacturing firms include mining companies, fertilizer plants, sugar central, rice and corn mills and other food processing plants. Tacloban

2080-424: Is produced by leaching manganese ore with sulfuric acid and a subsequent electrowinning process. A more progressive extraction process involves directly reducing (a low grade) manganese ore by heap leaching . This is done by percolating natural gas through the bottom of the heap; the natural gas provides the heat (needs to be at least 850 °C) and the reducing agent (carbon monoxide). This reduces all of

2160-774: Is relatively rare, produced by cosmic rays impact on iron . Manganese isotopic contents are typically combined with chromium isotopic contents and have found application in isotope geology and radiometric dating . Mn–Cr isotopic ratios reinforce the evidence from Al and Pd for the early history of the Solar System . Variations in Cr/ Cr and Mn/Cr ratios from several meteorites suggest an initial Mn/ Mn ratio, which indicate that Mn–Cr isotopic composition must result from in situ decay of Mn in differentiated planetary bodies. Hence, Mn provides additional evidence for nucleosynthetic processes immediately before coalescence of

2240-442: Is stable up to the manganese melting point of 1,519 K (1,250 °C; 2,270 °F). It has a body-centered cubic structure (two atoms per cubic unit cell). Common oxidation states of manganese are +2, +3, +4, +6, and +7, although all oxidation states from −3 to +7 have been observed. Manganese in oxidation state +7 is represented by salts of the intensely purple permanganate anion MnO − 4 . Potassium permanganate

2320-408: Is the hub of investment, trade and development in the region. Other industries include coconut oil extraction, alcohol distilling, beverage manufacture and forest products. Home industries include hat and basket weaving, metal craft, needlecraft, pottery, ceramics, woodcraft, shell craft and bamboo craft. Tinikling , the Philippines' national dance is folkdance that originated from the region. But

2400-519: Is the only state university of the province with four extension campus while Samar State University is Samar's state university with two extension campuses. Northwest Samar State University serves Samar Province's first district. For teacher education, the Leyte Normal University specializes in education courses. Waray language The term Waray comes from the word often heard by non-speakers meaning 'none' or 'nothing' in

2480-632: Is the sole regional center. These provinces and cities occupy the easternmost islands of the Visayas group of islands, hence the region's name. Some historians believe that the oldest ancient kingdom in the Philippines is found in this region, the Lakanate of Lawan, which plays a significant role in the Polynesian and Austronesian intermigration. Eastern Visayas faces the Philippine Sea to

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2560-405: Is unusual among elemental metals in having a very complex unit cell, with 58 atoms per cell (29 atoms per primitive unit cell) in four different types of site. It is paramagnetic at room temperature and antiferromagnetic at temperatures below 95 K (−178 °C). Beta manganese (β-Mn) forms when heated above the transition temperature of 973 K (700 °C; 1,290 °F). It has

2640-412: Is used as a reagent in organic chemistry for the oxidation of benzylic alcohols (where the hydroxyl group is adjacent to an aromatic ring ). Manganese dioxide has been used since antiquity to oxidize and neutralize the greenish tinge in glass from trace amounts of iron contamination. MnO 2 is also used in the manufacture of oxygen and chlorine and in drying black paints. In some preparations, it

2720-469: Is written using the Latin script. There is no officially-approved orthography for the language and different writers may use differing orthographic styles. In general, it has become common to write the language following the current orthographic conventions of Filipino. Waray uses many different words to specify a particular thing. These words might not be the same in spelling and in construction but they share

2800-496: The Middle Ages until modern times and is evident in 14th-century glass from Venice . Because it was used in glassmaking, manganese dioxide was available for experiments by alchemists, the first chemists. Ignatius Gottfried Kaim (1770) and Johann Glauber (17th century) discovered that manganese dioxide could be converted to permanganate , a useful laboratory reagent. Kaim also may have reduced manganese dioxide to isolate

2880-602: The Spartan steel exceptionally hard. Around the beginning of the 19th century, manganese was used in steelmaking and several patents were granted. In 1816, it was documented that iron alloyed with manganese was harder but not more brittle. In 1837, British academic James Couper noted an association between miners' heavy exposure to manganese and a form of Parkinson's disease . In 1912, United States patents were granted for protecting firearms against rust and corrosion with manganese phosphate electrochemical conversion coatings, and

2960-523: The ocean floor has 500 billion tons of manganese nodules . Attempts to find economically viable methods of harvesting manganese nodules were abandoned in the 1970s. In South Africa, most identified deposits are located near Hotazel in the Northern Cape Province , ( Kalahari manganese fields ), with a 2011 estimate of 15 billion tons. In 2011 South Africa produced 3.4 million tons, topping all other nations. Manganese

3040-672: The 'Oktubafest' every October to showcase the best local wine made from coconut palm called tuba . The region's Leyte and Samar islands serve as main link between Luzon and Mindanao by land transport. A total of nine airports, are strategically located in different parts of the six provinces that define the region. Daniel Z. Romualdez Airport in Tacloban is the main gateway by air to the region. There are seaports in Tacloban , Baybay , Laoang , Catbalogan , Calbayog , Borongan , Allen , Ormoc , Bato , Hilongos , Maasin , Sogod , and Naval . The Pan-Philippine Highway passes through

3120-476: The +6 oxidation state is the green anion manganate , [MnO 4 ] . Manganate salts are intermediates in the extraction of manganese from its ores. Compounds with oxidation states +5 are somewhat elusive, and often found associated to an oxide (O ) or nitride (N ) ligand. One example is the blue anion hypomanganate [MnO 4 ] . Mn(IV) is somewhat enigmatic because it is common in nature but far rarer in synthetic chemistry. The most common Mn ore, pyrolusite ,

3200-491: The 2020s. The real mission of Hughes Glomar Explorer was to raise a sunken Soviet submarine, the K-129 , with the goal of retrieving Soviet code books. An abundant resource of manganese in the form of manganese nodules found on the ocean floor. These nodules, which are composed of 29% manganese, are located along the ocean floor . The environmental impacts of nodule collection are of interest. Dissolved manganese (dMn)

3280-479: The 20th century, manganese dioxide was widely used as the cathodic for commercial disposable dry batteries of both the standard (zinc–carbon) and alkaline types. Manganese is essential to iron and steel production by virtue of its sulfur -fixing, deoxidizing , and alloying properties. This application was first recognized by the British metallurgist Robert Forester Mushet (1811–1891) who, in 1856, introduced

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3360-481: The Biliran Bridge, constructed in 1975, connects Biliran to the island of Leyte. The Wawa Bridge also connects Panaon Island to the island of Leyte. The region is the top producer of geothermal energy supply in the country. The province of Leyte hosts the biggest geothermal plant in the Philippines. Still, geothermal exploration is ongoing in the nearby province of Biliran . With abundance of river system,

3440-471: The Solar System. Four allotropes (structural forms) of solid manganese are known, labeled α, β, γ and δ, and occurring at successively higher temperatures. All are metallic, stable at standard pressure, and have a cubic crystal lattice, but they vary widely in their atomic structures. Alpha manganese (α-Mn) is the equilibrium phase at room temperature. It has a body-centered cubic lattice and

3520-567: The alloys particularly useful in harsh automotive and industrial environments. Manganese oxide and sulfate are components of fertilizers. In the year 2000, an estimated 20,000 tons of these compounds were used in fertilizers in the US alone. A comparable amount of Mn compounds was also used in animal feeds. Methylcyclopentadienyl manganese tricarbonyl is an additive in some unleaded gasoline to boost octane rating and reduce engine knocking . Manganese(IV) oxide (manganese dioxide, MnO 2 )

3600-718: The east-central section of the Philippine archipelago. It consists of three main islands, Leyte, Biliran, and Samar, which form the easternmost coasts of the archipelago. It is bounded on the east and north by the Philippine Sea with the San Bernardino Strait separating Samar from southeastern Luzon ; on the west by the Camotes and Visayan seas, and on the south by the Bohol Sea with the Surigao Strait separating Leyte from northeastern Mindanao . It has

3680-612: The east. The region's most famous landmark is the San Juanico Bridge , which links the islands of Samar and Leyte . As of 2020, the Eastern Visayas region has a population of 4,547,150 inhabitants, making it the least populous region in the Visayas. The current name of the region was derived from the position of its islands, which are all situated in the easternmost part of the Visayas . Eastern Visayas lies on

3760-539: The eastern part of Leyte Island fall under this type of climate. Type IV, on the other hand, has an even distribution of rainfall year-round and a short period of dry season that can be observed starting in February up to May. This type of climate is well exhibited in the western half of Leyte Island and in some portions of Samar, which covers the municipality of Motiong up to San Isidro in Northern Samar. As

3840-481: The element, in the form of Spiegeleisen . Manganese comprises about 1000  ppm (0.1%) of the Earth's crust and is the 12th most abundant element. Soil contains 7–9000 ppm of manganese with an average of 440 ppm. The atmosphere contains 0.01 μg/m . Manganese occurs principally as pyrolusite ( MnO 2 ), braunite (Mn Mn 6 )SiO 12 ), psilomelane (Ba,H 2 O) 2 Mn 5 O 10 , and to

3920-548: The entire province, starting from Allen in Northern Samar until Liloan in Southern Leyte, where it continues in Mindanao through a ferry service. The Palo-Carigara-Ormoc road is a spur of the aforementioned highway, connecting Cebu City to the network through a ferry ride from Ormoc. Bridges connect all the islands in the region. Apart from the famed San Juanico Bridge, which connects the islands of Samar and Leyte,

4000-491: The form of ferrocene ( Fe(C 5 H 5 ) 2 ). When conducted under an atmosphere of carbon monoxide , reduction of Mn(II) salts gives dimanganese decacarbonyl Mn 2 (CO) 10 , an orange and volatile solid. The air-stability of this Mn(0) compound (and its many derivatives) reflects the powerful electron-acceptor properties of carbon monoxide. Many alkene complexes and alkyne complexes are derived from Mn 2 (CO) 10 . In Mn(CH 3 ) 2 (dmpe) 2 , Mn(II)

4080-465: The free element when it was isolated much later. Manganese dioxide, which is abundant in nature, has long been used as a pigment. The cave paintings in Gargas that are 30,000 to 24,000 years old are made from the mineral form of MnO 2 pigments. Manganese compounds were used by Egyptian and Roman glassmakers, either to add to, or remove, color from glass. Use as "glassmakers soap" continued through

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4160-667: The language; similarly, Cebuanos are known in Leyte as mga Kana and their language as Kana (after the oft-heard word kana , meaning 'that' in the Cebuano language ). The Cebuano pronunciation of Waray is walay with the same meaning. During the Spanish period, texts refer to the language as simply being a dialect of "Visayan". In contrast, most contemporary linguists consider many of these "Visayan dialects" (e.g., Cebuano, Hiligaynon, Karay-a, etc.) to be distinct languages, and

4240-412: The manganese content reaches 4%, the embrittlement of the steel becomes a dominant feature. The embrittlement decreases at higher manganese concentrations and reaches an acceptable level at 8%. Steel containing 8 to 15% of manganese has a high tensile strength of up to 863 MPa. Steel with 12% manganese was discovered in 1882 by Robert Hadfield and is still known as Hadfield steel (mangalloy) . It

4320-503: The manganese ore to manganese oxide (MnO), which is a leachable form. The ore then travels through a grinding circuit to reduce the particle size of the ore to between 150 and 250 μm, increasing the surface area to aid leaching. The ore is then added to a leach tank of sulfuric acid and ferrous iron (Fe ) in a 1.6:1 ratio. The iron reacts with the manganese dioxide (MnO 2 ) to form iron hydroxide (FeO(OH)) and elemental manganese (Mn). This process yields approximately 92% recovery of

4400-460: The manganese. For further purification, the manganese can then be sent to an electrowinning facility. In 1972, the CIA 's Project Azorian , through billionaire Howard Hughes , commissioned the ship Hughes Glomar Explorer with the cover story of harvesting manganese nodules from the sea floor. That triggered a rush of activity to collect manganese nodules, which was not actually practical until

4480-633: The metal, but that is uncertain. By the mid-18th century, the Swedish chemist Carl Wilhelm Scheele used manganese dioxide to produce chlorine . First, hydrochloric acid , or a mixture of dilute sulfuric acid and sodium chloride was made to react with manganese dioxide, and later hydrochloric acid from the Leblanc process was used and the manganese dioxide was recycled by the Weldon process . The production of chlorine and hypochlorite bleaching agents

4560-573: The metals and organic compounds can then cause them to be oxidized while the Mn(III,IV) oxides are reduced to Mn (e.g., Cr to Cr(VI) and colorless hydroquinone to tea-colored quinone polymers). Manganese is essential to iron and steel production by virtue of its sulfur -fixing, deoxidizing , and alloying properties. Manganese has no satisfactory substitute in these applications in metallurgy. Steelmaking , including its ironmaking component, has accounted for most manganese demand, presently in

4640-418: The most abundant stable isotope, Mn, is electron capture and the primary mode in heavier isotopes is beta decay . Manganese also has three meta states . Manganese is part of the iron group of elements, which are thought to be synthesized in large stars shortly before the supernova explosion. Mn decays to Cr with a half-life of 3.7 million years. Because of its relatively short half-life, Mn

4720-580: The most number of baccalaureate and post-baccalaureate courses among universities in the region. The Zonal Agricultural University for the Visayas under the National Agriculture Education System concept, Visayas State University (VSU) is also in the region, located in Baybay . Also, the region is home to Palompon Institute of Technology , a maritime school in the Philippines providing deck and engine cadet. Its main campus

4800-483: The most popular cultural dance among Waraynon s is the Kuratsa , danced during feast celebrations and special gatherings. The Leyte Kalipayan Dance Company , a local cultural group, held highly successful performances around the world. Waray people are music lovers whose folkloric music are mostly ballads in form, famous of which is Iroy nga Tuna (Motherland), a patriotic song. Since 2018, Eastern Visayas has held

4880-472: The needs of medium and heavy industries. Eastern Visayas consists of 6 provinces , 1 highly urbanized city , 1 independent component city, 5 component cities, 136 municipalities and 4,390 barangays .  †  Tacloban is a highly-urbanized city ; figures are excluded from Leyte province. The native languages of Eastern Visayas are: Poverty incidence of Eastern Visayas Source: Philippine Statistics Authority Eastern Visayas

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4960-524: The ocean from river inputs. Surface dMn concentrations can also be elevated biologically through photosynthesis and physically from coastal upwelling and wind-driven surface currents. Internal cycling such as photo-reduction from UV radiation can also elevate levels by speeding up the dissolution of Mn-oxides and oxidative scavenging, preventing Mn from sinking to deeper waters. Elevated levels at mid-depths can occur near mid-ocean ridges and hydrothermal vents. The hydrothermal vents release dMn enriched fluid into

5040-415: The old ones, are spoken alongside the Spanish counterparts. Waray has borrowed vocabulary extensively from other languages, especially from Spanish. These words are being adopted to fill lexical gaps of the recipient language. Spanish colonialization introduced new systems to the Philippine society. Manganese Manganese is a chemical element ; it has symbol Mn and atomic number 25. It

5120-441: The oxides to the divalent cation. The Mn(III,IV) oxides exist as brownish-black stains and small nodules on sand, silt, and clay particles. These surface coatings on other soil particles have high surface area and carry negative charge. The charged sites can adsorb and retain various cations, especially heavy metals (e.g., Cr , Cu , Zn , and Pb ). In addition, the oxides can adsorb organic acids and other compounds. The adsorption of

5200-576: The process has seen widespread use ever since. The invention of the Leclanché cell in 1866 and the subsequent improvement of batteries containing manganese dioxide as cathodic depolarizer increased the demand for manganese dioxide. Until the development of batteries with nickel–cadmium and lithium, most batteries contained manganese. The zinc–carbon battery and the alkaline battery normally use industrially produced manganese dioxide because naturally occurring manganese dioxide contains impurities. In

5280-488: The provinces of Samar and Eastern Samar , but not Northern Samar ), as well as in all of the Waray-speaking areas of Leyte , except the towns of Javier and Abuyog . However, this sound change is an areal feature rather than a strictly genetic one (Lobel 2009). Most Waray dialects in northeastern and Eastern Samar have the close central unrounded vowel /ɨ/ as a reflex of Proto-Austronesian *e. Waray

5360-400: The range of 85% to 90% of the total demand. Manganese is a key component of low-cost stainless steel . Often ferromanganese (usually about 80% manganese) is the intermediate in modern processes. Small amounts of manganese improve the workability of steel at high temperatures by forming a high-melting sulfide and preventing the formation of a liquid iron sulfide at the grain boundaries. If

5440-534: The region directly faces the Philippine Sea, typhoons coming from the east frequently strike the region, often at their peak intensities. This, along with the Bicol Region , are the most typhoon-prone areas in the Philippines. In 2013, the region was struck by Typhoon Haiyan , locally known as Super Typhoon Yolanda, which later became the deadliest and most destructive typhoon to hit the Philippines in

5520-651: The region has potential in hydroelectric production. The strait of San Juanico between Leyte and Samar islands has been declared as potential source for water current and tidal energy sources. Eastern Visayas is home to several state universities, including the prestigious University of the Philippines Tacloban College . The region is also home to the University of Eastern Philippines (UEP), located in Catarman , Northern Samar , which holds

5600-481: The regions of the Magnetes (either Magnesia , located within modern Greece, or Magnesia ad Sipylum , located within modern Turkey). They were both called magnes from their place of origin, but were considered to differ in sex. The male magnes attracted iron, and was the iron ore now known as lodestone or magnetite , and which probably gave us the term magnet . The female magnes ore did not attract iron, but

5680-415: The same basic reaction, but a different electrolyte mixture. In 2002, more than 230,000 tons of manganese dioxide was used for this purpose. Copper alloys of manganese, such as Manganin , are commonly found in metal element shunt resistors used for measuring relatively large amounts of current. These alloys have very low temperature coefficient of resistance and are resistant to sulfur. This makes

5760-537: The same meaning, making it a very diverse language. Here are some examples of demonstratives and adverbs together with their equivalent definition in Waray-Waray: Native numbers are used for numbers one through ten. From eleven onwards, Spanish numbers are exclusively used in Waray today, their native counterparts being almost unheard of by the majority of native speakers (except for gatos for hundred and yukot for thousand ). Some, especially

5840-570: The satellite era. The region's sea and inland waters are rich sources of salt, freshwater fish, and other marine products. It is one of the main fish-exporting regions of the country. There are substantial forest reserves in the interiors of the islands. Its mineral deposits include chromite , uranium (in Samar), gold , silver , manganese , magnesium , bronze , nickel , clay , coal , limestone , pyrite and sand and gravel . It also has abundant geothermal energy and water resources to support

5920-430: The speech of "Sámar and Leyte". Linguist Jason Lobel (2009) considers there are 25 dialects and subdialects of Waray-Waray. Many Waray dialects feature a sound change in which Proto-Bisayan *s becomes /h/ in a small number of common grammatical morphemes. This sound change occurs in all areas of Samar south of the municipalities of Santa Margarita , Matuginao , Las Navas , and Gamay (roughly corresponding to

6000-462: The term Visayan is usually taken to refer to what is called Cebuano in contemporary linguistic literature. Domingo Ezguerra's 1663 (reprinted 1747) Arte de la lengua bisaya de la provincia de Leyte refers to the "Visayan tongue of the province of Leyte", Figueroa's Arte del idioma Visaya de Samar y Leyte refers to the "Visaya language of Samar and Leyte". Antonio Sanchez's 1914 Diccionario español-bisaya (Spanish-Visayan Dictionary) refers to

6080-589: The water. The dMn can then travel up to 4,000 km due to the microbial capsules present, preventing exchange with particles, lowing the sinking rates. Dissolved Mn concentrations are even higher when oxygen levels are low. Overall, dMn concentrations are normally higher in coastal regions and decrease when moving offshore. Manganese occurs in soils in three oxidation states: the divalent cation, Mn and as brownish-black oxides and hydroxides containing Mn (III,IV), such as MnOOH and MnO 2 . Soil pH and oxidation-reduction conditions affect which of these three forms of Mn

6160-482: Was a large consumer of manganese ores. Scheele and others were aware that pyrolusite (mineral form of manganese dioxide) contained a new element. Johan Gottlieb Gahn isolated an impure sample of manganese metal in 1774, which he did by reducing the dioxide with carbon . The manganese content of some iron ores used in Greece led to speculations that steel produced from that ore contains additional manganese, making

6240-572: Was used for British military steel helmets and later by the U.S. military. Manganese is used in production of alloys with aluminium. Aluminium with roughly 1.5% manganese has increased resistance to corrosion through grains that absorb impurities which would lead to galvanic corrosion . The corrosion-resistant aluminium alloys 3004 and 3104 (0.8 to 1.5% manganese) are used for most beverage cans . Before 2000, more than 1.6 million tonnes of those alloys were used; at 1% manganese, this consumed 16,000 tonnes of manganese. Manganese(IV) oxide

6320-414: Was used in the original type of dry cell battery as an electron acceptor from zinc, and is the blackish material in carbon–zinc type flashlight cells. The manganese dioxide is reduced to the manganese oxide-hydroxide MnO(OH) during discharging, preventing the formation of hydrogen at the anode of the battery. The same material also functions in newer alkaline batteries (usually battery cells), which use

6400-438: Was used to decolorize glass. This female magnes was later called magnesia , known now in modern times as pyrolusite or manganese dioxide . Neither this mineral nor elemental manganese is magnetic. In the 16th century, manganese dioxide was called manganesum (note the two Ns instead of one) by glassmakers, possibly as a corruption and concatenation of two words, since alchemists and glassmakers eventually had to differentiate

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