Monday, August 31, 2015

Pomeranian (dog)

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Pomeranian (dog)

This article is about the dog breed. For other uses, see Pomeranian.
Pomeranian
Pomeranian 600.jpg
Other names Deutscher Spitz; Zwergspitz; Spitz nain; Spitz enano; Pom; Zwers
Nicknames Pompom, Pom, Tumbleweed
Country of origin Germany
(Modern-day North-Eastern Germany and North-Western Poland)
[hide]Traits
Life span 12–16
Dog (Canis lupus familiaris)
The Pomeranian (often known as a Pom or Pom Pom) is a breed of dog of the Spitz type, named for the Pomerania region in Central Europe (today part of northern Poland and eastern Germany). Classed as a toy dog breed because of its small size, the Pomeranian is descended from the larger Spitz type dogs, specifically the German Spitz. It has been determined by the Fédération Cynologique Internationale to be part of the German Spitz breed; and in many countries, they are known as the Zwergspitz ("Dwarf-Spitz").
The breed has been made popular by a number of royal owners since the 18th century. Queen Victoria owned a particularly small Pomeranian and consequently the smaller variety became universally popular. During Queen Victoria's lifetime alone, the size of the breed decreased by 50%. Overall, the Pomeranian is a sturdy, healthy dog. The most common health issue is Luxating patella. Tracheal collapse can also be an issue. More rarely, the breed can suffer from a skin condition colloquially known as "black skin disease", or Alopecia X. This is a genetic disease which causes the dog's skin to turn black and lose all or most of its hair.[1] As at 2013, in terms of registration figures, since at least 1998, the breed has ranked among the top twenty most popular breeds in the USA, and the current fashion for small dogs has increased their popularity worldwide.

Contents

Appearance

An Orange black Pomeranian.
A tricolored Pomeranian.
Pomeranians are small dogs weighing 1.9–3.5 kilograms (4.2–7.7 lb) and standing 5.0–11 inches (13–28 cm) high at the withers.[2] They are compact but sturdy dogs with an abundant textured coat with a highly plumed tail set high and flat.[3] The top coat forms a ruff of fur on the neck, which Poms are well known for, and they also have a fringe of feathery hair on the hindquarters.[4]
The earliest examples of the breed were white or occasionally brown or black. Queen Victoria adopted a small red Pomeranian in 1888, which caused that color to become fashionable by the end of the 19th century.[5] In modern times, the Pomeranian comes in the widest variety of colors of any dog breed, including white, black, brown, red, orange, cream, blue, sable, black and tan, brown and tan, spotted, brindle, plus combinations of those colors.[6] The most common colors are orange, black or cream/white.[3]
The merle Pomeranian is a recent color developed by breeders. It is a combination of a solid base color with lighter blue/grey patch which gives a mottled effect. The most common base colors for the effect are red/brown or black, although it can also appear with other colors. Combinations such as brindle merle or liver merle are not accepted in the breed standard. In addition, the eye, nose and paw pad are marshmallow color, changing parts of the eye to blue and the color on the nose and paw pads to become mottled pink and black.[7]
Pomeranians have a thick double coat, and while grooming is not difficult, breeders recommend that it be done daily to maintain the quality of the coat and because of its thickness and the constant shedding, with trimming every 1–2 months. The outer coat is long, straight, and harsh in texture while the undercoat is soft, thick and short. The coat knots and tangles easily, particularly when the undercoat is being shed, which happens twice a year.[8]

Temperament

Pomeranians are typically a very friendly, playful and lively breed of dog, but are often aggressive to other dogs[9][10] They love to be around their owners and are known to be protective of them.[11] Pomeranians are alert and aware of changes in their environment and barking at new stimuli can develop into a habit of barking excessively in any situation. They are somewhat defensive of their territory and will thus bark a lot when they encounter any outside noises.[12] Pomeranians are intelligent dogs, respond well to training, and can be very successful in getting what they want from their owners.[11] They are extroverted and enjoy being the center of attention but can become quite aggressive and dominant if not well trained.[11] The use of toys can be an effective tool in encouraging pomeranians to spend time alone.

Health

A black and tan Pomeranian

Overall health

The life expectancy of a Pomeranian is 12 to 16 years.[13] A well-bred dog on a good diet with appropriate exercise will have few health problems; and, if kept trim and fit, a Pomeranian is a sturdy dog.[14] The breed does have similar health issues to many dog breeds, although some issues such as hip dysplasia are uncommon because of the Pomeranian's lightweight build.[15] Some health issues can develop as a result of lack of attention to grooming and teeth-, ear-, and eye-cleaning. With routine care, these problems can be avoided.[16] They are prone to early tooth loss, and dry food is recommended.[17] Poms are one of the breeds with the smallest average litter size, with various source giving numbers of between 1.9 and 2.7 puppies per litter.[18]

Common problems

A white Pomeranian.
Merle colored dogs may suffer from mild to severe deafness, increased intraocular pressure, ametropia, microphthalmia, and colobomas. Merle dogs born from parents who are also both merles may additionally suffer from abnormalities of the skeletal, cardiac and reproductive systems.[19]
Luxating patella is another health issue in the Pomeranian breed.[15] It occurs when, through either malformation or trauma, the ridges forming the patellar groove in the knee are not prominent and are too shallow to allow the patella to properly sit securely. This can cause the patella to "luxate" (jump out of the groove) sideways which will cause the leg to lock up with the foot off the ground.[20] While the muscles are contracted the patella cannot return to the correct position. The initial pain is caused by the knee cap sliding across the ridges of the femur. Once out of position, the dog does not feel any pain caused by the slipped disc.[20]
Tracheal collapse is caused by a weakening of the tracheal rings in the windpipe. It occurs when the rings that normally hold the shape of the windpipe collapse, closing the airway. The symptoms of a collapse include a honking cough that can sound similar to a goose honk, an intolerance to exercise, fainting spells and a cough that is worsened by hot weather, exercise and excitement.[21]
In Pomeranians, a condition often called "black skin disease" occurs which is a combination of alopecia (hair loss) and hyperpigmentation (a darkening of the skin).[22] Other names for this condition include woolly coat, coat funk, pseudo-Cushing's disease, or severe hair loss syndrome. This condition affects male Pomeranians more than females, and may be inherited.[1] Although most affected dogs show signs following puberty, it can occur at any age. Other conditions can mimic this condition including Cushing's syndrome, hypothyroidism, chronic skin infections, and reproductive hormone disorders.[1]
Another common disorder in male Pomeranians is cryptorchidism.[23] This is when either one or both of the testicles do not descend into the scrotum.[23] It is treated through surgical removal of the retained testicle.[23]

History

Origins

A miniature Pomeranian from 1915.
The forerunners of today's Pomeranian breed were large working dogs from the Arctic regions. These dogs are commonly known as the Wolfspitz or Spitz type, which is German for "sharp point" which was the term originally used by Count Eberhard zu Sayn in the 16th Century as a reference to the features of the dog's nose and muzzle. The Pomeranian is considered to be descended from the German Spitz.[24]
The breed is thought to have acquired its name by association with the area known as Pomerania which is located in northern Poland and Germany along the Baltic Sea. Although not the origin of the breed, this area is credited with the breeding which led to the original Pomeranian type of dog. Proper documentation was lacking until the breed's introduction into the United Kingdom.[24]
An early modern recorded reference to the Pomeranian breed is from 2 November 1764, in a diary entry in James Boswell's Boswell on the Grand Tour: Germany and Switzerland. "The Frenchman had a Pomeranian dog named Pomer whom he was mighty fond of."[25] The offspring of a Pomeranian and a wolf bred by an animal merchant from London is discussed in Thomas Pennant's A Tour in Scotland from 1769.[26]
Two members of the British Royal Family influenced the evolution of the breed. In 1767, Queen Charlotte, Queen-consort of King George III of England, brought two Pomeranians to England.
"A man and a woman walking next to a wood with their white dog. The woman is dressed in a white 18th century gown and a black hat, and the man is dressed in a black suit with white stockings."
Portrait of Mr and Mrs William Hallett by Thomas Gainsborough, 1785. The painting features a larger type of Pomeranian than is now common.
Named Phoebe and Mercury, the dogs were depicted in paintings by Sir Thomas Gainsborough. These paintings depicted a dog larger than the modern breed, reportedly weighing as much as 30–50 lb (14–23 kg), but showing modern traits such as the heavy coat, ears and a tail curled over the back.[24]
Queen Victoria, Queen Charlotte's granddaughter, was also an enthusiast and established a large breeding kennel. One of her favoured dogs was a comparatively small red sable Pomeranian which she named "Windor's Marco" and was reported to weigh only 12 lb (5.4 kg). When she first exhibited Marco in 1891, it caused the smaller type Pomeranian to become immediately popular and breeders began selecting only the smaller specimens for breeding. During her lifetime, the size of the Pomeranian breed was reported to have decreased by 50%.[24] Queen Victoria worked to improve and promote the Pomeranian breed by importing smaller Pomeranians[27] of different colors from various European countries to add to her breeding program.[28] Royal owners during this period also included Joséphine de Beauharnais, the wife of Napoleon I of France, and King George IV of England.
The first breed club was set up in England in 1891, and the first breed standard was written shortly afterwards.[29] The first member of the breed was registered in America to the American Kennel Club in 1898, and it was recognized in 1900.[24]
In 1912, two Pomeranians were among only three dogs to survive the sinking of RMS Titanic. A Pomeranian called "Lady", owned by Miss Margaret Hays, escaped with her owner in lifeboat number seven, while Elizabeth Barrett Rothschild took her pet to safety with her in lifeboat number six.[30]
Glen Rose Flashaway won the Toy Group at the Westminster Kennel Club Dog Show in 1926, the first Pomeranian to win a group at Westminster.[24] It would take until 1988 for the first Pomeranian, "Great Elms Prince Charming II", to win the Best in Show prize from the Westminster Kennel Club.[31]
In the standard published in 1998, the Pomeranian is included in the German Spitz standard, along with the Keeshond, by the Fédération Cynologique Internationale.[32] According to the standard "Spitz breeds are captivating" and have a "unique characteristic, cheeky appearance."[32]

Popularity

Pomeranian.
The Pomeranian has been among the more popular dog breeds in the United States, featuring consistently in the top 20 of registered AKC dog breeds since at least 1998, when it was ranked #10; the breed was #17 in the 2011 rankings, dropping two spots from the previous year.[33] In 2012 and 2013 it remained in the top twenty and was ranked at #19.[34]
It is not listed in the top 20 breeds in the UK in either 2007 or 2008.[35] In Australia their popularity has declined since 1986, with a peak of 1128 Pomeranians registered with the Australian National Kennel Council in 1987; only 577 were registered in 2008. However, this is an increase from 2004, when only 491 dogs were registered.[36]
It is more popular in American cities in 2008, ranking joint tenth (with American Bulldog) in Detroit[37] and Orlando,[38] ninth in Los Angeles,[39] a joint seventh in Seattle (again, with the American Bulldog),[40] but third in Honolulu, only bested by the Labrador Retriever and the German Shepherd Dog.[37]

 

Friday, July 31, 2015

CHEMISTRY

What Is Chemistry?

 
 
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Chemistry is the study of matter, its properties, how and why substances combine or separate to form other substances, and how substances interact with energy. Many people think of chemists as being white-coated scientists mixing strange liquids in a laboratory, but the truth is we are all chemists.
Doctors, nurses and veterinarians must study chemistry, but understanding basic chemistry concepts is important for almost every profession. Chemistry is part of everything in our lives.
Every material in existence is made up of matter — even our own bodies. Chemistry is involved in everything we do, from growing and cooking food to cleaning our homes and bodies to launching a space shuttle. Chemistry is one of the physical sciences that help us to describe and explain our world.

Five branches

There are five main branches of chemistry, each of which has many areas of study.
Analytical chemistry uses qualitative and quantitative observation to identify and measure the physical and chemical properties of substances. In a sense, all chemistry is analytical.
Physical chemistry combines chemistry with physics. Physical chemists study how matter and energy interact. Thermodynamics and quantum mechanics are two of the important branches of physical chemistry.
Organic chemistry specifically studies compounds that contain the element carbon. Carbon has many unique properties that allow it to form complex chemical bonds and very large molecules. Organic chemistry is known as the “Chemistry of Life” because all of the molecules that make up living tissue have carbon as part of their makeup.
Inorganic chemistry studies materials such as metals and gases that do not have carbon as part of their makeup.
Biochemistry is the study of chemical processes that occur within living organisms.

Fields of study

Within these broad categories are countless fields of study, many of which have important effects on our daily life. Chemists improve many products, from the food we eat and the clothing we wear to the materials with which we build our homes. Chemistry helps to protect our environment and searches for new sources of energy.

Food chemistry

Food science deals with the three biological components of food — carbohydrates, lipids and proteins. Carbohydrates are sugars and starches, the chemical fuels needed for our cells to function. Lipids are fats and oils and are essential parts of cell membranes and to lubricate and cushion organs within the body. Because fats have 2.25 times the energy per gram than either carbohydrates or proteins, many people try to limit their intake to avoid becoming overweight. Proteins are complex molecules composed of from 100 to 500 or more amino acids that are chained together and folded into three-dimensional shapes necessary for the structure and function of every cell. Our bodies can synthesize some of the amino acids; however eight of them, the essential amino acids, must be taken in as part of our food. Food scientists are also concerned with the inorganic components of food such as its water content, minerals, vitamins and enzymes.
Food chemists improve the quality, safety, storage and taste of our food. Food chemists may work for private industry to develop new products or improve processing. They may also work for government agencies such as the Food and Drug Administration to inspect food products and handlers to protect us from contamination or harmful practices. Food chemists test products to supply information used for the nutrition labels or to determine how packaging and storage affects the safety and quality of the food. Flavorists work with chemicals to change the taste of food. Chemists may also work on other ways to improve sensory appeal, such as enhancing color, odor or texture.

Environmental chemistry

Environmental chemists study how chemicals interact with the natural environment. Environmental chemistry is an interdisciplinary study that involves both analytical chemistry and an understanding of environmental science. Environmental chemists must first understand the chemicals and chemical reactions present in natural processes in the soil water and air. Sampling and analysis can then determine if human activities have contaminated the environment or caused harmful reactions to affect it.
Water quality is an important area of environmental chemistry. “Pure” water does not exist in nature; it always has some minerals or other substance dissolved in it. Water quality chemists test rivers, lakes and ocean water for characteristics such as dissolved oxygen, salinity, turbidity, suspended sediments, and pH. Water destined for human consumption must be free of harmful contaminants and may be treated with additives like fluoride and chlorine to increase its safety.

Agricultural chemistry

Agricultural chemistry is concerned with the substances and chemical reactions that are involved with the production, protection and use of crops and livestock. It is a highly interdisciplinary field that relies on ties to many other sciences. Agricultural chemists may work with the Department of Agriculture, the Environmental Protection Agency, the Food and Drug Administration or for private industry. Agricultural chemists develop fertilizers, insecticides and herbicides necessary for large-scale crop production. They must also monitor how these products are used and their impacts on the environment. Nutritional supplements are developed to increase the productivity of meat and dairy herds.
Agricultural biotechnology is a fast-growing focus for many agricultural chemists. Genetically manipulating crops to be resistant to the herbicides used to control weeds in the fields requires detailed understanding of both the plants and the chemicals at the molecular level. Biochemists must understand genetics, chemistry and business needs to develop crops that are easier to transport or that have a longer shelf life.

Chemical engineering

Chemical engineers research and develop new materials or processes that involve chemical reactions. Chemical engineering combines a background in chemistry with engineering and economics concepts to solve technological problems. Chemical engineering jobs fall into two main groups: industrial applications and development of new products.
Industries require chemical engineers to devise new ways to make the manufacturing of their products easier and more cost effective. Chemical engineers are involved in designing and operating processing plants, develop safety procedures for handling dangerous materials, and supervise the manufacture of nearly every product we use. Chemical engineers work to develop new products and processes in every field from pharmaceuticals to fuels and computer components.

Geochemistry

Geochemists combine chemistry and geology to study the makeup and interaction between substances found in the Earth. Geochemists may spend more time in field studies than other types of chemists. Many work for the U.S. Geological Survey or the Environmental Protection Agency in determining how mining operations and waste can affect water quality and the environment. They may travel to remote abandoned mines to collect samples and perform rough field evaluations, and then follow a stream through its watershed to evaluate how contaminants are moving through the system. Petroleum geochemists are employed by oil and gas companies to help find new energy reserves. They may also work on pipelines and oil rigs to prevent chemical reactions that could cause explosions or spills.
Further reading:

Editor's Recommendations

FOOD CORPORATION OF INDIA

Food Corporation of India

From Wikipedia, the free encyclopedia
Food Corporation of India
भारतीय खाद्य निगम
Government-owned corporation
Industry PSU
Founded 1964
Founder Govt of India
Headquarters New Delhi, India
Area served
All India
Key people
Shri C. Viswanath (wef 28/5/2013 A/N) (I.A.S), Chairman & MD
Products Mainly Wheat & Rice
Services Govt Policy Execution
Number of employees
Sanctioned:- 36515 In position:- 26716 (as on 31/3/2013)
Website http://www.fciweb.nic.in/
Footnotes / references
It pay through IDA pattren not in CDA
Food Corporation of India (Hindi: भारतीय खाद्य निगम) was set up on 14 January 1965 having its first District Office at Thanjavur - rice bowl of Tamil Nadu - and headquarters at Chennai under the Food Corporations Act 1964 to implement the following objectives of the National Food Policy :
  1. Effective price support operations for safeguarding the interests of the farmers
  2. Distribution of foodgrains throughout the country for Public Distribution System
  3. Maintaining satisfactory level of operational and buffer stocks of foodgrains to ensure National Food Security
  4. Regulate market price to provide foodgrains to consumers at a reliable price

Contents

Statistics

It is one amongst the largest corporations in India and doubtless the largest supply chain management in Asia (Second in world ).[1] It operates through 5 zonal offices and 24 regional offices. Each year, the Food Corporation of India purchases roughly 15 to 20 per cent of India's wheat output and 12 to 15 per cent of its rice output. The purchases are made from the farmers at the rates declared by the Govt. of India. This rate is called as MSP (Minimum Support Price). There is no limit for procurement in terms of volume, any quantity can be procured by FCI(Food Corporation of India) provided the stock satisfies FAQ (Fair Average Quality) specifications with respect to FCI.

Organizational Structure

Food Corporation of India operates through it Field Offices/District Offices which are headed by an Assistant General Manager, designated as Area Manager.Under his control there are Managers to deal with each and every section viz.,sales, contracts, movement,establishment,quality control,operational Accounts etc., who consolidate the field level operations and through the Area Managers authorization, they transmit the necessary information and periodical statements to Regional offices of their respective regions.Regional Offices are headed by a General Manager who is in most of the cases from Indian Administrative Service/All India Services under deputation. Under his control Deputy General Managers who are FCI's officers coordinate with daily operations through the Assistant General Managers who were posted in various sections to oversee the functions of District offices units of their particular section. All these Officers appraise the General Manager periodically on various issues pertaining to district offices of that particular region. FCI had 5 zones i.e. North, South, East, West & North-East.[2] All the Regional Offices are under the control of Zonal Offices which are headed by an Executive Director who is in most of the cases from Indian Administrative Service/All India Services under deputation. Under his control three or more than three General Managers coordinate with all regional Offices of their particular zone through subordinate officers like Deputy General managers and Assistant General Managers dealing with their allotted operational sections in their zone. All the Zonal Offices are under the control of Head Quarters, New Delhi which is headed by Chairman & Managing Director who is an Indian Administrative Officer of Secretary Rank on Central Deputation.Head Quarters instruct, communicate, consolidate and refine the voluminous information required for the streamlined execution of day to day operations and coordinates with Ministry of Food, Consumer Affairs and Public Distribution and Food Secretary and various sister corporations like Central Warehousing Corporation, Indian Railways in formulating food policy or amending the existing policy to suit the emerging challenges in managing Food Security scenario of the nation.

Human Resources

Food Corporation of India has Following categories of Employees : 1. Category-I -Designation - Assistant General Manager, Deputy General Manager, General Manager. 2. Category-II -Designation - Manager 3. Category-III - Assistant Grade-I,Assistant Grade-II,Assistant Grade-III 4. Category-IV - Dusting operator & Picker etc.

Operations

The stocks are transported throughout India and issued to the State Government nominees at the rates declared by the Govt of India for further distribution under the Public Distribution System (PDS) for the consumption of the ration card holders. (FCI itself does not directly distribute any stock under PDS and its operations end at the exit of the stock from its depots). The difference between the purchase price and sale price, along with internal costs, are reimbursed by the Union Government in the form of Food Subsidy. At present the annual subsidy is around $10 billion. FCI by itself is not a Decision making authority, it does not decide anything about the MSP, Imports or Exports. It just implements the decisions made by the Ministry of Food and Ministry of Agriculture.

References


Form-16

Understanding Your Form-16

Your Form-16 contains details you need to file your Income Tax Return. Having a basic understanding about your Form-16 goes a long way to help you file your tax return.
See the below annotated image to understand some of the most relevant portions of your Form-16. It is a very brief form packed with information.
After reading this guide, you will be able to understand how the information from the Form-16 is entered in ClearTax.
Weighed down by too much tax rules, deductions and laws?
We’ll spare you the headache and give you access to our short and simple guide to tax planning and filing.

Form-16 Part B / Annexure / Salary Statement

When you fill your I-T Return, you need to enter the following details.

1 Taxable Salary

3 Aggregate of Section 80C Deductions
(Gross & Deductible Amount)

5 Tax Payable or Refund Due

2 Breakup of Section 80C Deductions

4 TDS (Tax Deducted at Source)

Form-16 Part A / Traces Form-16

When you fill your I-T Return, you need to enter the following details.

1 TDS Deducted by Employer

3 PAN of Employer

5 Current Assessment Year

7 Your PAN

2 TAN of Employer

4 Name and Address of Employer

6 Your (Taxpayer's) Name and Address


Information your Employer Provides

Taxable Salary

Your employer will provide key information such as Gross Salary, Perquisites, Various allowances and deductibles.
From a tax perspective Field-6, Income Chargeable under the head 'Salaries' is relevant. This is your taxable salary.

Tax Deducted at Source (TDS)

The other relevant information your employer will tell you is Tax deducted at source. This is field-18(a). This tax deducted is what you have paid to the Income Tax Department already.

The Income Tax Department provides Form-26 AS.
This is a Tax Credit Statement. This statement tells you how much Tax was deposited on your behalf with the Income Tax department. It is strongly recommended that you check your Form-26AS before you file your tax return.



Information you already have

Deductions

Deductions under Section 80C, 80D, 80E, 80CCF, 80G, 80DD, 80U, etc are reported by you to your Employer.
You may or may not have reported all deductions to your employer. That is no problem. You can still claim them in your Income Tax Return by filling up the relevant columns in ClearTax.
In general, its a good idea to report your tax deductions to your employer to minimize the TDS by employer.

Income other than Salary

If you receive any other Income, like interest from a bank account or rent, etc. You may have informed your employer about it. This is mentioned in Field-7.
Most commonly, people who have a housing loan report it to their employers for less tax deduction at source. Don't worry if you have not reported income to your employer
You can add additional Income to your Income Tax Return in the relevant columns of ClearTax.


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Frequently

Bulldozer

  1. Bulldozer

    From Wikipedia, the free encyclopedia
    For other uses, see Bulldozer (disambiguation).
    A working bulldozer from the First Tractor Company, on Xinbu Island, Hainan, China.
    A bulldozer is a crawler (continuous tracked tractor) equipped with a substantial metal plate (known as a blade) used to push large quantities of soil, sand, rubble, or other such material during construction or conversion work and typically equipped at the rear with a claw-like device (known as a ripper) to loosen densely compacted materials.
    Bulldozers can be found on a wide range of sites, mines and quarries, military bases, heavy industry factories, engineering projects and farms.
    The term "bulldozer" refers only to a tractor (usually tracked) fitted with a dozer blade.

    Contents

    Description

    A Caterpillar D10N bulldozer equipped with a single shank ripper.
    Most often bulldozers are large and powerful tracked heavy equipment. The tracks give them excellent ground holding capability and mobility through very rough terrain. Wide tracks help distribute the bulldozer's weight over a large area (decreasing ground pressure), thus preventing it from sinking in sandy or muddy ground. Extra wide tracks are known as swamp tracks or LGP (low ground pressure) tracks. Bulldozers have transmission systems designed to take advantage of the track system and provide excellent tractive force.
    Because of these attributes, bulldozers are often used in road building, construction, mining, forestry, land clearing, infrastructure development, and any other projects requiring highly mobile, powerful, and stable earth-moving equipment.
    Another type of bulldozer is the wheeled bulldozer, which generally has four wheels driven by a 4-wheel-drive system and has a hydraulic, articulated steering system. The blade is mounted forward of the articulation joint, and is hydraulically actuated.
    The bulldozer's primary tools are the blade and the ripper.

    Blade

    Bulldozer blade
    The bulldozer blade is a heavy metal plate on the front of the tractor, used to push objects, and shove sand, soil and debris. Dozer blades usually come in three varieties:
    1. A straight blade ("S blade") which is short and has no lateral curve and no side wings and can be used for fine grading.
    2. A universal blade ("U blade") which is tall and very curved, and has large side wings to carry more material.
    3. An "S-U" combination blade which is shorter, has less curvature, and smaller side wings. This blade is typically used for pushing piles of large rocks, such as at a quarry.
    Blades can be fitted straight across the frame, or at an angle, sometimes using additional 'tilt cylinders' to vary the angle while moving. The bottom edge of the blade can be sharpened, e.g. to cut tree stumps.
    Sometimes a bulldozer is used to push another piece of earth moving equipment known as a "scraper". The towed Fresno Scraper, invented in 1883 by James Porteous, was the first design to enable this to be done economically, removing the soil from the cut and depositing it elsewhere on shallow ground (fill). Many dozer blades have a reinforced center section with this purpose in mind, and are called "bull blades".
    In military use, dozer blades are fixed on combat engineering vehicles and can optionally be fitted on other vehicles, such as artillery tractors such as the Type 73 or M8 Tractor. Dozer blades can also be mounted on main battle tanks, where it can be used to clear antitank obstacles, mines, and dig improvised shelters. Combat applications for dozer blades include clearing battlefield obstacles and preparing fire positions.[1]

    Ripper

    Multi-shank ripper
    The ripper is the long claw-like device on the back of the bulldozer. Rippers can come as a single (single shank/giant ripper) or in groups of two or more (multi shank rippers). Usually, a single shank is preferred for heavy ripping. The ripper shank is fitted with a replaceable tungsten steel alloy tip. Ripping rock breaks the ground surface rock or pavement into small rubble easy to handle and transport, which can then be removed so grading can take place. With agricultural ripping, a farmer breaks up rocky or very hard earth (such as podzol hardpan), which is otherwise unploughable, in order to farm it. For example, much of the best land in the California wine country consists of old lava flows. The grower shatters the lava with heavy bulldozers so surface crops or trees can be planted. A less common rear attachment is a stumpbuster, which is a single spike that protrudes horizontally and can be raised to get it (mostly) out of the way. A stumpbuster is used to split a tree stump. A bulldozer with a stumpbuster is used for landclearing operations, and probably has a brush-rake blade.

    Modifications

    A tracked loader
    Bulldozers have been further modified over time to evolve into new machines which can work in ways that the original bulldozer cannot.
    One example is that loader tractors were created by removing the blade and substituting a large volume bucket and hydraulic arms which can raise and lower the bucket, thus making it useful for scooping up earth and loading it into trucks, these are often known as a Drott.
    Other modifications to the original bulldozer include making it smaller to let it operate in small work areas where movement is limited, such as in mining. A very small bulldozer is sometimes called a calfdozer.
    Some lightweight form of bulldozer are commonly used in snow removal and as a tool for preparing winter sports areas for ski and snowboard sports.
    In an angledozer (image here) the blade can be pushed forward at one end to make it easier to push material away to the side.
    Nevertheless, the original earthmoving bulldozers are still irreplaceable as their tasks are concentrated in deforestation, earthmoving, ground levelling, and road carving. Heavy bulldozers are mainly employed to level the terrain to prepare it for construction. The construction, however, is mainly done by small bulldozers and loader tractors.

    Armored bulldozers

    Main article: Armored bulldozers
    An armored Caterpillar D9R Bulldozer used by Israel Defense Forces
    Some bulldozers, especially bulldozers in military usage, have been fitted with armor to protect the driver from enemy fire, enabling the bulldozer to operate in battle zones. The best-known use of an armored bulldozer is probably the use by the Israeli Defence Forces (IDF) of the IDF Caterpillar D9, for earth moving, clearing terrain obstacles, opening routes, detonating explosive charges, and demolishing Palestinian homes. The extensive use of armored bulldozers during the Second Intifada drew controversy and criticism from human rights organizations while military experts saw it as a key factor in reducing IDF casualties.
    Some bulldozers have been fitted with armor by non-government civilian operators to prevent bystanders or police from interfering with the work performed by the bulldozer, as in the case of strikes or demolition of condemned buildings. This has also been done by civilians with a dispute with the authorities, such as Marvin Heemeyer, who outfitted his Komatsu D355A bulldozer with homemade composite armor to then demolish government buildings.

    History

    A Liebherr bulldozer with a multi-shank ripper.
    Bulldozer for solid waste management.
    The first bulldozers were adapted from Holt farm tractors that were used to plow fields. The versatility of tractors in soft ground for logging and road building contributed to the development of the armoured tank in World War I.
    In 1923, a young farmer named James Cummings and a draftsman named J. Earl McLeod made the first designs for the bulldozer. A replica is on display at the city park in Morrowville, Kansas where the two built the first bulldozer.[2] On December 18, 1923, Cummings and McLeod filed U.S. patent #1,522,378 that was later issued on January 6, 1925 for an "Attachment for Tractors."[3]
    By the 1920s, tracked vehicles became common, particularly the Caterpillar 60. Rubber-tired vehicles came into use in the 1940s. To dig canals, raise earth dams, and do other earth-moving jobs, these tractors were equipped with a large thick metal plate in front. (The blade got its curved shape later). In some early models the driver sat on top in the open without a cabin. There are three main types of bulldozer blades: a U-blade for pushing and carrying dirt relatively long distances, a straight blade for "knocking down" and spreading piles of dirt, and a brush rake for removing brush and roots. These attachments (home-built or built by small equipment manufacturers of attachments for wheeled and crawler tractors and trucks) appeared by 1929.
    Widespread acceptance of the bull-grader does not seem to appear before the mid-1930s. The addition of power down-force provided by hydraulic cylinders instead of just the weight of the blade made them the preferred excavation machine for large and small contractors alike by the 1940s, by which time the term "bulldozer" referred to the entire machine and not just the attachment.
    Over the years, bulldozers got bigger and more powerful in response to the demand for equipment suited for ever larger earthworks. Firms like Caterpillar, Komatsu, Case, Euclid,[4] Allis Chalmers, Liebherr, LiuGong, Terex, Fiat-Allis, John Deere, BEML, XGMA and International Harvester manufactured large tracked-type earthmoving machines. R.G. LeTourneau and Caterpillar manufactured large rubber tired bulldozers.[5]
    Bulldozers grew more sophisticated as time passed. Improvements include drivetrains analogous to (in automobiles) an automatic transmission instead of a manual transmission such as the early Euclid C-6 and TC-12 or Model C Tournadozer, blade movement controlled by hydraulic cylinders or electric motors instead of early models' cable winch/brake, and automatic grade control. Hydraulic cylinders enabled the application of down force, more precise manipulation of the blade and automated controls.
    A more recent innovation is the outfitting of bulldozers with GPS technology, such as manufactured by Topcon Positioning Systems, Inc., Trimble Inc, or Leica Geosystems for precise grade control and (potentially) "stakeless" construction. As a response to the many, -and often varying claims about these systems, The Kellogg Report[6] published in 2010 a detailed comparison of all the manufacturers' systems, evaluating more than 200 features for dozers alone.
    The best-known maker of bulldozers is probably Caterpillar in the US, which earned its reputation by making tough, durable, reliable machines. Komatsu, Liebherr, Case and John Deere are present-day competitors. Although these machines began as modified farm tractors, they became the mainstay for big civil construction projects, and found their way into use by military construction units worldwide. The best-known model, the Caterpillar D9, was also used to clear mines and demolish enemy structures.

    Manufacturers

    Industry statistics based on 2010 production published by Off-Highway Research showed Shantui was the largest producer of bulldozers, making over 10,000 units that year or 2 in 5 crawler-type dozers made in the world.[7] The next largest producer by number of units is Caterpillar Inc., which produced 6,400 units.[7]

    History of the word

    • 19th century: term used in engineering for a horizontal forging press.
    • Around 1880: In the USA, a "bull-dose" was a large dose (namely, one large enough to be literally or figuratively effective against a bull) of any sort of medicine or punishment. 'Bull-dosing' meant a severe whipping or coercion, or other intimidation such as at gunpoint.[8]
    • 1886: "bulldozer" meant a large-caliber pistol and the person who wielded it.[8]
    • Late 19th century: "bulldozing" meant using brute force to push over or through any obstacle.[8]
    • 1930s: applied to the vehicle.
    These appeared as early as 1929, but were known as "bull grader" blades, and the term "bulldozer blade" did not appear to come into widespread use until the mid-1930s. "Bulldozer" now refers to the whole machine not just the attachment. In contemporary usage, "bulldozer" is often shortened to "dozer".

    See also

    • Athanas for the 'bulldozer shrimp' (from the way it pushes sand about)
    • Marvin Heemeyer, known for his rampage with a modified bulldozer.

    References


  2. Trewhitt, Philip (1999). Armoured Fighting Vehicles. Dempsey-Parr. ISBN 1-84084-328-4.

  3. Kansas Curiosities: Quirky Characters, Roadside Oddities & Other Offbeat Stuff. Retrieved 2012-04-01.

  4. Patent 1522378, Attachment For Tractors, John E McLeod and James D Cummings, Filed December 18, 1923.

  5. Haddock, Keith. "Euclid-General Motors' Crawler Tractor". PEI Tractor Club. Retrieved 11 September 2011.

  6. "Tournadozer Built for Speedy Earthmoving". Construction Equipment. Retrieved 11 September 2011.

  7. The Kellogg Report LLC (2010). Article: The Kellogg Report. Retrieved December 15, 2010 from kelloggreport.com

  8. "Shantui officially largest dozer producer in the world". The Earthmover & Civil Contractor. May 2011.

  9. "History of the Bulldozer". Retrieved 2008-12-17.