Misplaced Pages

#437562

107-511: Yamunanagar ( pronunciation ), is a city and a municipal corporation in Yamunanagar district in the Indian state of Haryana . This town is known for the cluster of plywood units and paper factories. It provides timber to larger industries. The older town is called Jagadhri . The Yamunanagar-Jagadhri railway station (YJUD) services the city. Despite its name, Jagadhri Railway

214-413: A composite material . The sheets of wood are stacked such that each layer has its grain set typically (see below) perpendicular to its adjacent layers. This alternation of the grain is called cross-graining and has several important benefits: it reduces the tendency of wood to split when nailed at the edges; it reduces thickness swelling and shrinkage, providing improved dimensional stability; and it makes

321-428: A caveat along the lines of "not suitable for boat In India,marine ply is popularly called "Kitply" after the brand which popularised the concept of water proof marine plywood in the 1980"s. Other types of plywoods include fire-retardant, moisture-resistant, wire mesh, sign-grade, and pressure-treated. However, the plywood may be treated with various chemicals to improve the plywood's fireproofing. Each of these products

428-577: A central area containing buildings with special economic, political, and religious significance. Archaeologists refer to this area by the Greek term temenos or if fortified as a citadel . These spaces historically reflect and amplify the city's centrality and importance to its wider sphere of influence . Today cities have a city center or downtown , sometimes coincident with a central business district . Cities typically have public spaces where anyone can go. These include privately owned spaces open to

535-665: A central authority. The term can also refer either to the physical streets and buildings of the city or to the collection of people who dwell there and can be used in a general sense to mean urban rather than rural territory . National censuses use a variety of definitions – invoking factors such as population , population density , number of dwellings , economic function, and infrastructure – to classify populations as urban. Typical working definitions for small-city populations start at around 100,000 people. Common population definitions for an urban area (city or town) range between 1,500 and 50,000 people, with most U.S. states using

642-461: A central point. This form could evolve from successive growth over a long time, with concentric traces of town walls and citadels marking older city boundaries. In more recent history, such forms were supplemented by ring roads moving traffic around the outskirts of a town. Dutch cities such as Amsterdam and Haarlem are structured as a central square surrounded by concentric canals marking every expansion. In cities such as Moscow , this pattern

749-552: A combination of these. Societies that live in cities are often called civilizations . The degree of urbanization is a modern metric to help define what comprises a city: "a population of at least 50,000 inhabitants in contiguous dense grid cells (>1,500 inhabitants per square kilometer)". This metric was "devised over years by the European Commission , OECD , World Bank and others, and endorsed in March [2021] by

856-620: A continuous urban landscape called urban agglomeration , conurbation , or megalopolis (exemplified by the BosWash corridor of the Northeastern United States .) The emergence of cities from proto-urban settlements , such as Çatalhöyük , is a non-linear development that demonstrates the varied experiences of early urbanization . The cities of Jericho , Aleppo , Byblos , Faiyum , Yerevan , Athens , Matera , Damascus , and Argos are among those laying claim to

963-430: A distinctive elite social class, but it should indeed be considered a city based on a functional redefinition of urban development. In particular, Jenné-Jeno featured settlement mounds arranged according to a horizontal, rather than vertical, power hierarchy, and served as a center of specialized production and exhibited functional interdependence with the surrounding hinterland. More recently, scholars have concluded that

1070-642: A fuselage made of birch plywood sandwiching a balsa core, and using plywood extensively for the wings. Plywood was also used for the hulls in the hard-chine Motor Torpedo Boats (MTB) and Motor Gun Boats (MGB) built by the British Power Boat Company and Vosper 's, American PT boats , and the Higgins landing craft critical to the D-Day landings. The American designers Charles and Ray Eames are known for their plywood-based furniture, as

1177-401: A good log, called a peeler, which is generally straighter and larger in diameter than one required for processing into dimensioned lumber by a sawmill . The log is laid horizontally and rotated about its long axis while a long blade is pressed into it, causing a thin layer of wood to peel off (much as a continuous sheet of paper from a roll). An adjustable nosebar, which may be solid or a roller,

SECTION 10

#1732772525438

1284-477: A grid plan with specialized districts used across the Hellenistic Mediterranean . The urban-type settlement extends far beyond the traditional boundaries of the city proper in a form of development sometimes described critically as urban sprawl . Decentralization and dispersal of city functions (commercial, industrial, residential, cultural, political) has transformed the very meaning of

1391-511: A key role in both the economy and government. Late antique cities in the East were also undergoing intense transformations, with increased political participation of the crowds and demographical fluctuations. Christian communities and their doctrinal differences increasingly shaped the urban fabric. The locus of power shifted to Constantinople and to the ascendant Islamic civilization with its major cities Baghdad , Cairo , and Córdoba . From

1498-402: A large number of other hardwoods. Flexible plywood is designed for making curved parts, a practice which dates back to the 1850s in furniture making. At 3 ⁄ 8 inch (9.5 mm) thick, mahogany three-ply "wiggle board" or "bendy board" come in 4 by 8 feet (1.2 m × 2.4 m) sheets with a very thin cross-grain central ply and two thicker exterior plies, either long grain on

1605-531: A minimum between 1,500 and 5,000 inhabitants. Some jurisdictions set no such minima. In the United Kingdom , city status is awarded by the Crown and then remains permanent. (Historically, the qualifying factor was the presence of a cathedral , resulting in some very small cities such as Wells , with a population of 12,000 as of 2018 , and St Davids , with a population of 1,841 as of 2011 .) According to

1712-431: A press at a temperature of at least 140 °C (284 °F), and at a pressure of up to 1.9 MPa (280 psi) (but more commonly 1.4 MPa [200 psi]) to form the plywood panel. The panel can then be patched, have minor surface defects such as splits or small knot holes filled, re-sized, sanded or otherwise refinished, depending on the market for which it is intended. Plywood for indoor use generally uses

1819-703: A privileged elite among towns having won self-governance from their local lord or having been granted self-governance by the emperor and being placed under his immediate protection. By 1480, these cities, as far as still part of the empire, became part of the Imperial Estates governing the empire with the emperor through the Imperial Diet . By the 13th and 14th centuries, some cities become powerful states, taking surrounding areas under their control or establishing extensive maritime empires. In Italy, medieval communes developed into city-states including

1926-498: A result, many manufacturers are turning to low formaldehyde-emitting glue systems, denoted by an "E" rating. Plywood produced to "E0" has effectively zero formaldehyde emissions. In addition to the glues being brought to the forefront, the wood resources themselves are becoming the focus of manufacturers, due in part to energy conservation, as well as concern for natural resources. There are several certifications available to manufacturers who participate in these programs. Programme for

2033-495: A rule cannot produce their own food and therefore must develop some relationship with a hinterland that sustains them. Only in special cases such as mining towns which play a vital role in long-distance trade, are cities disconnected from the countryside which feeds them. Thus, centrality within a productive region influences siting, as economic forces would, in theory, favor the creation of marketplaces in optimal mutually reachable locations. The vast majority of cities have

2140-519: A single thick layer of wood. Understanding the industrial potential of laminated wood, he invented the rotary lathe . There is little record of the early implementation of the rotary lathe and the subsequent commercialization of plywood as we know it today, but in its 1870 edition, the French dictionary Robert describes the process of rotary lathe veneer manufacturing in its entry Déroulage . One can thus presume that rotary lathe plywood manufacturing

2247-452: A small proportion of humanity overall, but following two centuries of unprecedented and rapid urbanization , more than half of the world population now lives in cities, which has had profound consequences for global sustainability . Present-day cities usually form the core of larger metropolitan areas and urban areas —creating numerous commuters traveling toward city centres for employment, entertainment, and education. However, in

SECTION 20

#1732772525438

2354-549: A super-wealthy elite living in gated communities and large masses of people living in substandard housing with inadequate infrastructure and otherwise poor conditions. Cities around the world have expanded physically as they grow in population, with increases in their surface extent, with the creation of high-rise buildings for residential and commercial use, and with development underground. Urbanization can create rapid demand for water resources management , as formerly good sources of freshwater become overused and polluted, and

2461-423: A temple. A minority viewpoint considers that cities may have arisen without agriculture, due to alternative means of subsistence (fishing), to use as communal seasonal shelters, to their value as bases for defensive and offensive military organization, or to their inherent economic function. Cities played a crucial role in the establishment of political power over an area, and ancient leaders such as Alexander

2568-567: A workers' town associated with the pyramid of Senusret II , and the religious city Amarna built by Akhenaten and abandoned. These sites appear planned in a highly regimented and stratified fashion, with a minimalistic grid of rooms for the workers and increasingly more elaborate housing available for higher classes. In Mesopotamia, the civilization of Sumer , followed by Assyria and Babylon , gave rise to numerous cities, governed by kings and fostered multiple languages written in cuneiform . The Phoenician trading empire, flourishing around

2675-471: A world of intensifying globalization , all cities are to varying degrees also connected globally beyond these regions. This increased influence means that cities also have significant influences on global issues , such as sustainable development , climate change , and global health . Because of these major influences on global issues, the international community has prioritized investment in sustainable cities through Sustainable Development Goal 11 . Due to

2782-409: Is Finnish Architect Alvar Aalto and his firm Artek , while Phil Bolger has designed a wide range of boats built primarily of plywood. Jack Köper of Cape Town designed the plywood Dabchick sailing dinghy , which as of 2015 is still sailed by large numbers of teenagers. Plywood is often used to create curved surfaces because it can easily bend with the grain. Skateboard ramps often utilize plywood as

2889-399: Is also a common European size for Baltic birch ply, and aircraft ply. Sizes on specialised plywood for concrete-forming can range from 15 ⁄ 64 to 13 ⁄ 16  in (6 to 21 mm), and a multitude of formats exist, though 15 × 750 × 1,500 mm (.59in × 30 × 59 in) (19/32in × 2 ft-6in × 4 ft-11in)

2996-407: Is attributed to the easy accessibility of primary raw material – poplar tree . It has also one of India's largest railways, carriage and wagon repair workshops . Recently, Reliance Infrastructure has also installed Deenbandhu Chhotu Ram Thermal Power Station in the town. Haryana Urban Development Authority has done major development work in the land stretch linking the city with Jagadhri ,

3103-552: Is common in December, January and February. The Western Yamuna Canal of the river Yamuna flows on one side of the city. This canal serves the irrigation needs of the farmers. The canal has century-old path ways, known locally as pattris , on both sides, which serve as connecting routes between villages even today and also help the irrigation department to maintain the canal and serve as a perfect scenic walk—with water on one side and green lush farms on other. The Yamuna river marks

3210-533: Is designed to fill a need in industry. Baltic Birch plywood is a product of an area around the Baltic Sea. Originally manufactured for European cabinet makers but now popular in the United States as well. It is very stable composed of an inner void-free core of cross-banded birch plys with an exterior grade adhesive. The face veneers are thicker than traditional cabinet grade Plywood production requires

3317-702: Is extremely strong and light. Howard Hughes' H-4 Hercules was constructed of plywood. The plane was built by the Hughes Aircraft Company employing a plywood-and-resin Duramold process. The specialized wood veneer was made by Roddis Manufacturing in Marshfield, Wisconsin . Usually faced with hardwood , including ash , oak , red oak , birch , maple , mahogany , shorea (often called lauan, meranti, or Philippine mahogany, though having no relation to true mahogany), rosewood , teak and

Yamunanagar - Misplaced Pages Continue

3424-509: Is from 1 ⁄ 8  to 3 inches (3.2–76.2 mm). The sizes of the most commonly used plywood sheets are 4 by 8 feet (1,220 mm × 2,440 mm) which was first used by the Portland Manufacturing Company, who developed modern veneer core plywood for the 1905 Portland World Fair. A common metric size for a sheet of plywood is 1200 × 2400 mm. 5 × 5 feet (1,500 × 1,500 mm)

3531-573: Is higher in the center of the panel, and at the outer fibres. Within Europe basic plywood can be divided into three main categories: birch plywood (density approx. 680 kg/m ), mixed plywood (density approx. 620 kg/m ) and conifer plywoods (density 460– 520 kg/m ). Different varieties of plywood exist for different applications: Softwood plywood is usually made either of cedar , Douglas fir or spruce , pine , and fir (collectively known as spruce-pine-fir or SPF) or redwood and

3638-506: Is made of mixed hardwood species of tropical timber . Originally from the Asian region, it is now also manufactured in African and South American countries. Tropical plywood is superior to softwood plywood due to its density, strength, evenness of layers, and high quality. It is usually sold at a premium in many markets if manufactured with high standards. Tropical plywood is widely used in

3745-508: Is made out of wood from dicot trees (oak, beech and mahogany) and used for demanding end uses. Hardwood plywood is characterized by its excellent strength, stiffness, durability and resistance to creep. It has a high planar shear strength and impact resistance, which make it especially suitable for heavy-duty floor and wall structures. Oriented plywood construction has a high wheel-carrying capacity. Hardwood plywood has excellent surface hardness, and damage- and wear-resistance. Tropical plywood

3852-564: Is manufactured to a number of specifications including those outlined since 1931 in the Germanischer Lloyd Rules for Surveying and Testing of Plywood for Aircraft and MIL-P-607, the latter of which calls for shear testing after immersion in boiling water for three hours to verify the adhesive qualities between the plies meets specifications. Aircraft grade plywood is made from three or more plies of birch, as thin as 0.40 millimetres ( 1 ⁄ 64  in) thick in total, and

3959-480: Is named after Shyama Prasad Mukherjee . Yamunanagar is well-connected to Delhi and other cities in Haryana such as Panipat , Karnal , Ambala , Kurukshetra , Kaithal and Rohtak . Four-laning of the highway connecting Yamunanagar to the state capital of Chandigarh via Panchkula was recently completed. Colleges and other educational institutes include: City Historically, city dwellers have been

4066-539: Is pressed against the log during rotation, to create a "gap" for veneer to pass through between the knife and the nosebar. The nosebar partly compresses the wood as it is peeled; it controls vibration of the peeling knife; and assists in keeping the veneer being peeled to an accurate thickness. In this way the log is peeled into sheets of veneer, which are then cut to the desired oversize dimensions, to allow it to shrink (depending on wood species) when dried. The sheets are then patched, graded, glued together and then baked in

4173-583: Is situated in Yamunanagar. There is also another railway station called Jagadhri Workshop in Yamunanagar. This town was part of Ambala district before it was made as separate district in November 1989. The town was formerly known as Abdullahpur and Jamnanagar. Before the Independence, it was a small village with most of the population lived around the railway station, which increased as a result of

4280-517: Is still clearly visible. A system of rectilinear city streets and land plots, known as the grid plan , has been used for millennia in Asia, Europe, and the Americas. The Indus Valley Civilization built Mohenjo-Daro , Harappa , and other cities on a grid pattern, using ancient principles described by Kautilya , and aligned with the compass points . The ancient Greek city of Priene exemplifies

4387-420: Is the most urban continent, with four-fifths of its population living in cities, including one-fifth of the population said to live in shantytowns ( favelas , poblaciones callampas , etc.). Batam , Indonesia , Mogadishu , Somalia , Xiamen , China , and Niamey , Niger , are considered among the world's fastest-growing cities, with annual growth rates of 5–8%. In general, the more developed countries of

Yamunanagar - Misplaced Pages Continue

4494-530: Is typically used for construction and industrial purposes. The most common dimension is 1.2 by 2.4 metres (3 ft 11 in × 7 ft 10 in) or the slightly larger imperial dimension of 4 feet × 8 feet. Plies vary in thickness from 1.4 mm to 4.3 mm. The number of plies—which is always odd—depends on the thickness and grade of the sheet. Roofing can use the thinner 16-millimetre ( 5 ⁄ 8  in) plywood. Subfloors are at least 19 millimetres ( 3 ⁄ 4  in) thick,

4601-438: Is very commonly used. Aircraft plywood is available in thicknesses of 1 ⁄ 8 inch (3 mm) (3-ply construction) and upwards; typically aircraft plywood uses veneers of 0.5 mm (approx 1/64 in) thickness although much thinner veneers such as 0.1 mm are also used in construction of some of the thinner panels. Grading rules differ according to the country of origin. The most popular standards are

4708-603: The Republic of Venice and the Republic of Genoa . In Northern Europe, cities including Lübeck and Bruges formed the Hanseatic League for collective defense and commerce. Their power was later challenged and eclipsed by the Dutch commercial cities of Ghent , Ypres , and Amsterdam . Similar phenomena existed elsewhere, as in the case of Sakai , which enjoyed considerable autonomy in late medieval Japan. In

4815-947: The United Nations ... largely for the purpose of international statistical comparison". The word city and the related civilization come from the Latin root civitas , originally meaning 'citizenship' or 'community member' and eventually coming to correspond with urbs , meaning 'city' in a more physical sense. The Roman civitas was closely linked with the Greek polis —another common root appearing in English words such as metropolis . In toponymic terminology, names of individual cities and towns are called astionyms (from Ancient Greek ἄστυ 'city or town' and ὄνομα 'name'). Urban geography deals both with cities in their larger context and with their internal structure. Cities are estimated to cover about 3% of

4922-505: The Uruk period . In the fourth and third millennium BC , complex civilizations flourished in the river valleys of Mesopotamia , India , China , and Egypt . Excavations in these areas have found the ruins of cities geared variously towards trade, politics, or religion. Some had large, dense populations , but others carried out urban activities in the realms of politics or religion without having large associated populations. Among

5029-730: The civilization of Djenne-Djenno was likely established by the Mande progenitors of the Bozo people . Their habitation of the site spanned the period from 3rd century BCE to 13th century CE. Archaeological evidence from Jenné-Jeno, specifically the presence of non-West African glass beads dated from the third century BCE to the fourth century CE, indicates that pre-Arabic trade contacts probably existed between Jenné-Jeno and North Africa. Additionally, other early urban centers in West Africa, dated to around 500 CE, include Awdaghust , Kumbi Saleh ,

5136-622: The commune ( in France and Chile ; or comune in Italy). Plywood Plywood is a composite material manufactured from thin layers, or "plies", of wood veneer that have been stacked and glued together. It is an engineered wood from the family of manufactured boards, which include plywood, medium-density fibreboard (MDF), oriented strand board (OSB), and particle board (or chipboard). All plywoods bind resin and wood fibre sheets ( cellulose cells are long, strong and thin) to form

5243-427: The government workers . (This arrangement contrasts with the more typically horizontal relationships in a tribe or village accomplishing common goals through informal agreements between neighbors, or the leadership of a chief.) The governments may be based on heredity, religion, military power, work systems such as canal-building, food distribution, land-ownership, agriculture, commerce, manufacturing, finance, or

5350-538: The knowledge economy . A new smart city paradigm, supported by institutions such as the RAND Corporation and IBM , is bringing computerized surveillance , data analysis, and governance to bear on cities and city dwellers. Some companies are building brand-new master-planned cities from scratch on greenfield sites. Urbanization is the process of migration from rural to urban areas, driven by various political, economic, and cultural factors. Until

5457-564: The service economy and public-private partnerships , with concomitant gentrification , uneven revitalization efforts , and selective cultural development. Under the Great Leap Forward and subsequent five-year plans continuing today, China has undergone concomitant urbanization and industrialization and become the world's leading manufacturer . Amidst these economic changes, high technology and instantaneous telecommunication enable select cities to become centers of

SECTION 50

#1732772525438

5564-535: The " Global North " remain more urbanized than the less developed countries of the " Global South "—but the difference continues to shrink because urbanization is happening faster in the latter group. Asia is home to by far the greatest absolute number of city-dwellers: over two billion and counting. The UN predicts an additional 2.5 billion city dwellers (and 300 million fewer country dwellers) worldwide by 2050, with 90% of urban population expansion occurring in Asia and Africa. Megacities , cities with populations in

5671-539: The "functional definition", a city is not distinguished by size alone, but also by the role it plays within a larger political context. Cities serve as administrative, commercial, religious, and cultural hubs for their larger surrounding areas. The presence of a literate elite is often associated with cities because of the cultural diversities present in a city. A typical city has professional administrators , regulations, and some form of taxation (food and other necessities or means to trade for them) to support

5778-532: The 18th century), Ile-Ifẹ̀ (70,000 to 105,000 inhabitants in the 14th and 15th centuries), Niani (50,000 inhabitants in 1400 AD) and Timbuktu (100,000 inhabitants in 1450 AD). In the West, nation-states became the dominant unit of political organization following the Peace of Westphalia in the seventeenth century. Western Europe's larger capitals (London and Paris) benefited from the growth of commerce following

5885-420: The 18th century, an equilibrium existed between the rural agricultural population and towns featuring markets and small-scale manufacturing. With the agricultural and industrial revolutions urban population began its unprecedented growth, both through migration and demographic expansion . In England , the proportion of the population living in cities jumped from 17% in 1801 to 72% in 1891. In 1900, 15% of

5992-718: The 30th and 18th centuries BC. Mesoamerica saw the rise of early urbanism in several cultural regions, beginning with the Olmec and spreading to the Preclassic Maya , the Zapotec of Oaxaca, and Teotihuacan in central Mexico. Later cultures such as the Aztec , Andean civilizations , Mayan , Mississippians , and Pueblo peoples drew on these earlier urban traditions. Many of their ancient cities continue to be inhabited, including major metropolitan cities such as Mexico City , in

6099-697: The 9th through the end of the 12th century, Constantinople , the capital of the Eastern Roman Empire , was the largest and wealthiest city in Europe, with a population approaching 1 million. The Ottoman Empire gradually gained control over many cities in the Mediterranean area, including Constantinople in 1453 . In the Holy Roman Empire , beginning in the 12th century, free imperial cities such as Nuremberg , Strasbourg , Frankfurt , Basel , Zürich , and Nijmegen became

6206-566: The Andes, the first urban centers developed in the Norte Chico civilization , Chavin and Moche cultures, followed by major cities in the Huari , Chimu , and Inca cultures. The Norte Chico civilization included as many as 30 major population centers in what is now the Norte Chico region of north-central coastal Peru . It is the oldest known civilization in the Americas, flourishing between

6313-539: The British Standard (BS) and the American Standard (ASTM). Joyce (1970), however, list some general indication of grading rules: Plywood is used in many applications that need high-quality, high-strength sheet material. Quality in this context means resistance to cracking, breaking, shrinkage, twisting and warping. Exterior glued plywood is suitable for outdoor use, but because moisture affects

6420-538: The Endorsement of Forest Certification (PEFC) Forest Stewardship Council (FSC), Leadership in Energy and Environmental Design (LEED), Sustainable Forestry Initiative (SFI), and Greenguard are all certification programs that ensure that production and construction practices are sustainable. Many of these programs offer tax benefits to both the manufacturer and the end user. The most commonly used thickness range

6527-529: The Great founded and created them with zeal. Jericho and Çatalhöyük , dated to the eighth millennium BC , are among the earliest proto-cities known to archaeologists. However, the Mesopotamian city of Uruk from the mid-fourth millennium BC (ancient Iraq) is considered by most archaeologists to be the first true city, innovating many characteristics for cities to follow, with its name attributed to

SECTION 60

#1732772525438

6634-608: The UK, Japan, United States, Taiwan, Korea, Dubai, and other countries worldwide. It is used for construction purposes in many regions due to its low cost. However, many countries' forests have been over-harvested, including the Philippines, Malaysia and Indonesia, largely due to the demand for plywood production and export. High-strength plywood, also known as aircraft plywood, is made from mahogany, spruce and/or birch using adhesives with an increased resistance to heat and humidity. It

6741-482: The Yamuna river enters the plain area for the first time. The historical river Saraswati also originates from Adi badri , also located in the district. Towards its northern edge is a sub-mountainous region, which has more forest cover and many streams; it is the area where the river Yamuna flows out of the hills and into the plains. The northern boundary is also an interstate boundary with the state of Himachal Pradesh to

6848-526: The ancient Greek verb πλέκω . The ancient Egyptians and Greeks cut wood thinly and glued it together in layers with the grain in perpendicular directions as fine wood was in short supply. This is believed to have been done purely for cosmetic and economical purposes but it turned out to be a great alternative to pure wood as it reduced flex, making it a versatile building material. In 1797 Samuel Bentham applied for patents covering several machines to produce veneers. In his patent applications, he described

6955-536: The ancient capital of Ghana, and Maranda , a center located on a trade route between Egypt and Gao. The dissolution of the Roman Empire in the West was connected with profound changes in urban fabric of western Europe. In places where Roman administration quickly weakened urbanism went through a profound crisis, even if it continued to remain an important symbolic factor. In regions like Italy or Spain cities diminished in size but nevertheless continued to play

7062-464: The athletic, artistic, spiritual, and political life of the polis. Rome was the first city that surpassed one million inhabitants. Under the authority of its empire , Rome transformed and founded many cities ( Colonia ), and with them brought its principles of urban architecture, design, and society. In the ancient Americas , early urban traditions developed in the Andes and Mesoamerica . In

7169-407: The benefit of mitigating the urban heat island effect, especially in cities that are in warmer climates. These spaces prevent carbon imbalances, extreme habitat losses, electricity and water consumption, and human health risks. The urban structure generally follows one or more basic patterns: geomorphic, radial, concentric, rectilinear, and curvilinear. The physical environment generally constrains

7276-405: The boundary of the district with the state of Uttar Pradesh , which borders the city on the eastern side. The neighbouring city is Saharanpur in the state of Uttar Pradesh. The district borders the state of Himachal Pradesh , Sirmaur being the district and the towns of Nahan and Paonta Sahib being the towns nearby. Tajewala headworks—from where the Yamuna canal is diverted—also lies north of

7383-447: The chance of trapping water in the plywood and hence providing a solid and stable glue bond. It uses an exterior Weather and Boil Proof (WBP) glue similar to most exterior plywoods. Marine plywood can be graded as being compliant with BS 1088 , which is a British Standard for marine plywood and IS:710 is Bureau of Indian Standards (BIS) for marine grade plywood. There are few international standards for grading marine plywood and most of

7490-561: The city. Jagadhri is an adjoining town famous for its industrial brass sheet and stainless steel industry. Religion in Yamunanagar City (2011) As per provisional data of census 2011, Yamunanagar urban agglomeration had a population of 383,318, out of which males were 205,346 and females were 177,972. The population in the age range 0 to 6 years was 40,950. The total number of literates were 293,475, of which males were 163,791 and females were 129,684. The effective literacy rate of

7597-574: The concept of laminating several layers of veneer with glue to form a thicker piece – the first description of what we now call plywood. Bentham was a British naval engineer with many shipbuilding inventions to his credit. Veneers at the time of Bentham were flat sawn , rift sawn or quarter sawn ; i.e. cut along or across the log manually in different angles to the grain and thus limited in width and length. About fifty years later Immanuel Nobel , father of Alfred Nobel , realized that several thinner layers of wood bonded together would be stronger than

7704-542: The early Old World cities, Mohenjo-daro of the Indus Valley civilization in present-day Pakistan , existing from about 2600 BC, was one of the largest, with a population of 50,000 or more and a sophisticated sanitation system . China's planned cities were constructed according to sacred principles to act as celestial microcosms . The Ancient Egyptian cities known physically by archaeologists are not extensive. They include (known by their Arab names) El Lahun ,

7811-671: The efficiency of transportation and the smaller land consumption , dense cities hold the potential to have a smaller ecological footprint per inhabitant than more sparsely populated areas. Therefore, compact cities are often referred to as a crucial element in fighting climate change. However, this concentration can also have some significant negative consequences, such as forming urban heat islands , concentrating pollution , and stressing water supplies and other resources. A city can be distinguished from other human settlements by its relatively great size, but also by its functions and its special symbolic status , which may be conferred by

7918-484: The emergence of an Atlantic trade. However, most towns remained small. During the Spanish colonization of the Americas, the old Roman city concept was extensively used. Cities were founded in the middle of the newly conquered territories and were bound to several laws regarding administration, finances, and urbanism. The growth of the modern industry from the late 18th century onward led to massive urbanization and

8025-812: The first millennium AD, the Khmer capital of Angkor in Cambodia grew into the most extensive preindustrial settlement in the world by area, covering over 1,000 km and possibly supporting up to one million people. West Africa already had cities before the Common Era , but the consolidation of Trans-Saharan trade in the Middle Ages multiplied the number of cities in the region, as well as making some of them very populous, notably Gao (72,000 inhabitants in 800 AD), Oyo-Ile (50,000 inhabitants in 1400 AD, and may have reached up to 140,000 inhabitants in

8132-440: The form in which a city is built. If located on a mountainside, urban structures may rely on terraces and winding roads. It may be adapted to its means of subsistence (e.g. agriculture or fishing). And it may be set up for optimal defense given the surrounding landscape. Beyond these "geomorphic" features, cities can develop internal patterns, due to natural growth or to city planning . In a radial structure, main roads converge on

8239-412: The form of an alcoholic solution or powder, which, however, did not provide sufficient accuracy of application. Around 1930 a dry process of gluing veneers to plywood with phenolic resin in form of a film has begun to spread in the production of waterproof plywood. A typical plywood panel has face veneers of a higher grade than the core veneers. The principal function of the core layers is to increase

8346-472: The land surface of the Earth. Town siting has varied through history according to natural, technological, economic, and military contexts. Access to water has long been a major factor in city placement and growth, and despite exceptions enabled by the advent of rail transport in the nineteenth century, through the present most of the world's urban population lives near the coast or on a river. Urban areas as

8453-469: The less expensive urea-formaldehyde glue, which has limited water resistance, while outdoor and marine-grade plywood are designed to withstand moisture, and use a water-resistant resorcinol-formaldehyde or phenol-formaldehyde glue to prevent delamination and to retain strength in high humidity . The adhesives used in plywood have become a point of concern. Both urea formaldehyde and phenol formaldehyde are carcinogenic in very high concentrations. As

8560-475: The longest continual inhabitation . Cities, characterized by population density , symbolic function, and urban planning , have existed for thousands of years. In the conventional view, civilization and the city were both followed by the development of agriculture , which enabled the production of surplus food and thus a social division of labor (with concomitant social stratification ) and trade . Early cities often featured granaries , sometimes within

8667-464: The migration of refugees from West Punjab after the partition. Yamunanagar has the river Yamuna (its namesake) running through the district, which forms the eastern boundary with the neighbouring Saharanpur district. This boundary is also a state boundary, as Saharanpur is in the state of Uttar Pradesh . The district also separates the Yamuna system from the Satluj river system. From Yamunanagar,

8774-497: The multi-millions, have proliferated into the dozens, arising especially in Asia, Africa, and Latin America. Economic globalization fuels the growth of these cities, as new torrents of foreign capital arrange for rapid industrialization, as well as the relocation of major businesses from Europe and North America, attracting immigrants from near and far. A deep gulf divides the rich and poor in these cities, which usually contain

8881-656: The north. Sirmour in Himachal is the district to its north with the towns of Nahan and Paonta Sahib close to the boundary with Yamunanagar. Record High – 47.9 degrees Record Low – -0.5 degrees Record rainfall (24 hours) – 383mm in Jagadhri on 14 July 2016 . Average Rainfall of Monsoon – 891 mm. Chhachhrauli and Bilaspur tehsils are the rainiest Tehsils in Haryana. They are known as "The Cherapunjjis of Haryana". Loo blows generally between 15 May to 20 June. Fog

8988-461: The original material was not strictly plywood, but a single sheet of veneer. Marine plywood is manufactured from durable face and core veneers, with few defects so it performs longer in both humid and wet conditions and resists delaminating and fungal attack. Its construction is such that it can be used in environments where it is exposed to moisture for long periods. Each wood veneer will be from tropical hardwoods and have negligible core gap, limiting

9095-542: The other part of Twin city which is known for its brass and stainless steel utensils. Located at the base of Shivalik Hills , Yamuna Nagar has moderately developed tourism industry. Yamunanagar has Two Railway station named Yamuna Nagar-Jagadhri & Jagadhri Workshop Railway station. It is on the popular direct route Amritsar – Kolkata Main Line. The 1,042 metres (3,419 ft) long Railway Bridge on River Yamuna connects Yamuna Nagar-Jagadhri with Saharanpur . The bridge

9202-432: The population above 7 years of age was 85.72 per cent. The Yamunanagar-Jagadhri Municipal Corporation is headed by Municipal Commissioner Ayush Sinha, IAS . The elected head is Mayor Madan Chauhan. The city is divided into 22 wards for the purpose of development, each of which is represented by a municipal councillor. Yamuna Nagar is well known for its industries. It has emerged as an important industrial destination in

9309-500: The public as well as forms of public land such as public domain and the commons . Western philosophy since the time of the Greek agora has considered physical public space as the substrate of the symbolic public sphere . Public art adorns (or disfigures) public spaces. Parks and other natural sites within cities provide residents with relief from the hardness and regularity of typical built environments . Urban green spaces are another component of public space that provides

9416-810: The rise of new great cities, first in Europe and then in other regions, as new opportunities brought huge numbers of migrants from rural communities into urban areas. England led the way as London became the capital of a world empire and cities across the country grew in locations strategic for manufacturing . In the United States from 1860 to 1910, the introduction of railroads reduced transportation costs, and large manufacturing centers began to emerge, fueling migration from rural to city areas. Some industrialized cities were confronted with health challenges associated with overcrowding , occupational hazards of industry, contaminated water and air, poor sanitation , and communicable diseases such as typhoid and cholera . Factories and slums emerged as regular features of

9523-698: The same location as Tenochtitlan ; while ancient continuously inhabited Pueblos are near modern urban areas in New Mexico , such as Acoma Pueblo near the Albuquerque metropolitan area and Taos Pueblo near Taos ; while others like Lima are located nearby ancient Peruvian sites such as Pachacamac . From 1600 BC, Dhar Tichitt , in the south of present-day Mauritania , presented characteristics suggestive of an incipient form of urbanism. The second place to show urban characteristics in West Africa

9630-445: The separation between the outer layers where the bending stresses are highest, thus increasing the panel's resistance to bending . As a result, thicker panels can span greater distances under the same loads. In bending, the maximum stress occurs in the outermost layers, one in tension , the other in compression . Bending stress decreases from the maximum at the face layers to nearly zero at the central layer. Shear stress , by contrast,

9737-548: The sheet, or cross grain. Wiggle board is often glued together in two layers once it is formed into the desired curve, so that the final shape will be stiff and resist movement. Often, decorative wood veneers are added as a surface layer. In the United Kingdom single-ply sheets of veneer were used to make stove pipe hats in Victorian times, so flexible modern plywood is sometimes known there as "hatters ply", although

9844-421: The standards are voluntary. Some marine plywood has a Lloyd's of London stamp that certifies it to be BS 1088 compliant. Some plywood is also labeled based on the wood used to manufacture it. Examples of this are Okoumé or Meranti . In the UK, one can find builders' merchants advertising a grade of ply as "marine ply" that does not conform to BS 1088 - generally online adverts for these products will include

9951-446: The state. This has been despite its relatively isolated location within the state. Due to expanding industries, the city kept on extending geographically. The main crops produced are sugarcane, wheat, and rice. The city also produces sugar machinery, paper machinery, and highly efficient equipment for petrochemical plants, which are shipped to various refineries across the country. The city is also known for its plywood industries, which

10058-410: The strength of the panel consistent across all directions. There is usually an odd number of plies, so that the sheet is balanced, that is, the surface layers have their grains set parallel to one another. This balance reduces warping. Because plywood is bonded with grains running against one another and with an odd number of composite parts, it has high stiffness perpendicular to the grain direction of

10165-501: The strength of wood, optimal performance is achieved where the moisture content remains relatively low. Subzero conditions do not affect the dimensional or strength properties of plywood, making some special applications possible. Plywood is also used as an engineering material for stressed-skin applications. It has been used for marine and aviation applications since WWII. Most notable is the British de Havilland Mosquito bomber, with

10272-453: The surface ply. Smaller, thinner, and lower-quality plywoods may only have their plies (layers) arranged at right angles to each other. Some better-quality plywood products by design have five plies in steps of 45 degrees (0, 45, 90, 135, and 180 degrees), giving strength in multiple axes. The word ply derives from the French verb plier , "to fold", from the Latin verb plico , from

10379-489: The term and has challenged geographers seeking to classify territories according to an urban-rural binary. Metropolitan areas include suburbs and exurbs organized around the needs of commuters , and sometimes edge cities characterized by a degree of economic and political independence. (In the US these are grouped into metropolitan statistical areas for purposes of demography and marketing .) Some cities are now part of

10486-404: The thickness depending on the distance between floor joists . Plywood for flooring applications is often tongue and groove (T&G); This prevents one board from moving up or down relative to its neighbor, providing a solid-feeling floor when the joints do not lie over joists. T&G plywood is usually found in the 13-to-25-millimetre ( 1 ⁄ 2 to 1 in) range. Hardwood plywood

10593-443: The top smooth surface over bent curves to create transition that can simulate the shapes of ocean waves. Typical end uses of spruce plywood are: There are coating solutions available that mask the prominent grain structure of spruce plywood. For these coated plywoods there are some end uses where reasonable strength is needed but the lightness of spruce is a benefit, e.g.: Phenolic resin film coated (Film Faced) hardwood plywood

10700-412: The turn of the first millennium BC , encompassed numerous cities extending from Tyre , Cydon , and Byblos to Carthage and Cádiz . In the following centuries, independent city-states of Greece , especially Athens , developed the polis , an association of male landowning citizens who collectively constituted the city. The agora , meaning "gathering place" or "assembly", was the center of

10807-446: The urban landscape. In the second half of the 20th century, deindustrialization (or " economic restructuring ") in the West led to poverty , homelessness , and urban decay in formerly prosperous cities. America's "Steel Belt" became a " Rust Belt " and cities such as Detroit , Michigan, and Gary, Indiana began to shrink , contrary to the global trend of massive urban expansion. Such cities have shifted with varying success into

10914-589: The volume of sewage begins to exceed manageable levels. The local government of cities takes different forms including prominently the municipality (especially in England , in the United States , India , and other British colonies ; legally, the municipal corporation ; municipio in Spain and Portugal , and, along with municipalidad , in most former parts of the Spanish and Portuguese empires) and

11021-523: The world's population lived in cities. The cultural appeal of cities also plays a role in attracting residents. Urbanization rapidly spread across Europe and the Americas and since the 1950s has taken hold in Asia and Africa as well. The Population Division of the United Nations Department of Economic and Social Affairs reported in 2014 that for the first time, more than half of the world population lives in cities. Latin America

11128-543: Was Dia , in present-day Mali , from 800 BC. Both Dhar Tichitt and Dia were founded by the same people: the Soninke , who would later also found the Ghana Empire . Another ancient site, Jenné-Jeno , in what is today Mali , has been dated to the third century BCE. According to Roderick and Susan McIntosh, Jenné-Jeno did not fit into traditional Western conceptions of urbanity as it lacked monumental architecture and

11235-693: Was an established process in France in the 1860s. Plywood was introduced into the United States in 1865 and industrial production there started shortly after. In 1928, the first standard-sized 4 ft by 8 ft (1.22 m by 2.44 m) plywood sheets were introduced in the United States for use as a general building material. Artists use plywood as a support for easel paintings to replace traditional canvas or cardboard. Ready-made artist boards for oil painting in three-layered plywood (3-ply) were produced and sold in New York as early as 1880. There were experiments with gluing plywood with phenolic resins, mostly in

11342-490: Was formed in two separate mirror-image halves, using curved moulds. Structural aircraft-grade plywood is most commonly manufactured from African mahogany, spruce or birch veneers that are bonded together in a hot press over hardwood cores of basswood or poplar or from European Birch veneers throughout. Basswood is another type of aviation-grade plywood that is lighter and more flexible than mahogany and birch plywood but has slightly less structural strength. Aviation-grade plywood

11449-439: Was used in the construction of air assault gliders during World War II and also several fighter aircraft , most notably the multi-role British Mosquito . Nicknamed "The Wooden Wonder", plywood was used for the wing surfaces, and also flat sections such as bulkheads and the webs of the wing spars. The fuselage had exceptional rigidity from the bonded ply-balsa-ply 'sandwich' of its monocoque shell; elliptical in cross-section, it

#437562