The Science and Engineering of Materials

About Absorption Chiller

noreply@blogger.com (Admin) — Tue, 03 Jan 2012 13:45:00 +0000

An absorption chiller is a refrigeration machine, in which, in contrast to the compression refrigeration machine compaction influenced by temperature of the refrigerant solution. This is also known as a thermal compressor. The refrigerant is absorbed into a solvent circuit at low temperature in a second material and desorbed at higher temperatures. In the process, the temperature dependence of the physical solubility of two materials is used. Prerequisite for the process is that the two substances are mutually soluble in the temperature interval used in any ratio.
The absorption refrigeration cycle is considered the oldest known industrial process refrigeration, and originally was a request for freezing the main reason why in 1755 to deal with the development of heat pumps. In the first experiments of William Cullen (born April 15, † February 5, 1790), a physician and chemist, water was frozen with the aid of a vacuum. A continuously operating whole process was not developed.

Only 22 years later, in 1777, the principles of absorption were discovered and understood. John Leslie's 1810, an absorption refrigeration system with the refrigerant and the water absorbent sulfuric acid. The first reliable working refrigerator, with essential parts of cold steam engine in 1834 by Jacob Perkins (born July 9, 1766; † July 30, 1849) built a mechanically operated compressor. These advances have been filed in his patent No. 6662 "Apparatus for Producing Cold and Cooling Fluids". The explosive refrigerant ethyl ether hindered the development of so much only after his death, the economic interest of this invention to increase.
In 1840 one of John Leslie Perkins built on patent-based functioning ice machine. Then in 1850 produced one of Carré in sulfuric acid and water as working fluid based industrial ice machine. The development has been replaced by the working fluid pair Carré by ammonia and water, and written down in his patent 1859th In this and the following patents F. Carré described for a periodically operating machines for very small capacities and on the other machine with great performance. These patents laid the foundation for further development and were the first industrially important.
William Thomson, also 1 Baron Kelvin was called to demonstrate in 1852 that chillers can be used for heating rather than cooling. In its publication "Heating Machine" has been demonstrated to be devoted to a motor-driven heat pump is less primary energy, as in direct heating. Another pioneer in the field of absorption machines was Charles Tellier, who built his plant in 1864 with methyl ether. These developments were continued until 1927, until the first refrigerator was in Germany on the market.
Carrier Corporation, the company began in 1940 with research on a lithium bromide / water absorption chiller and 1945, led the first major investment. These units were designed to 100-700 tons capacity and working with low-pressure steam as the heat source.

Nowadays, in almost every camper an absorption refrigerator is installed in order to be independent of electrical supply. In these refrigerators, the heat required is generated by gas. Furthermore, these fridges are also used in hotel rooms, but here is supplied with electrical energy, and guarantee the desired quietness during continuous cooling.

Since few years, absorption heat pumps for domestic and industrial use in the area are available from a few kilowatts to several megawatts. These are available in different versions for different applications. Pure heat pumps serve the heating, cooling, or a combination of both. The absorption chiller combines the following fundamental ideas: The temperature required to vaporize a liquid decreases with decreasing pressure, ie the refrigerant evaporates at low temperatures due to the low absolute pressure in the evaporator. In the case of LiBr-water absorption refrigeration system is used as a refrigerant and sprayed in a almost evacuated container at a coil and vaporized at about 3 ° C. Which is required for the evaporation latent heat removed from the building's cold water in the coil, which is useful as refrigerants available. The evaporation process would stop when the saturation pressure of the refrigerant would be reached in the evaporator. Therefore, the refrigerant vapor is continuously removed in a second step. This makes you look at the properties of certain salt solutions advantage, refrigerant vapor from the air to prevent, ie to absorb. Hence the name "absorption chiller". The move comes in the so-called absorber. The absorption process would stop when the salt solution is saturated with refrigerant. Therefore, in the third step of the salt solution, the refrigerant will be removed permanently. This enriched with refrigerant salt solution in the so-called generator or expeller is pumped, in which the moisture by heating (80 ° - 120 ° C) is evaporated by boiling, and again - but at a much higher temperature and pressure level. The concentrated salt solution is in the closed circuit re-routed back to the absorber. The refrigerant vapor from the expeller is the last step in the condenser using cooling water from a cooling system (eg cooling tower) cooled back down to baseline levels, condensed, and then to the evaporator.

Materials Innovations for Industry and Society

noreply@blogger.com (Admin) — Sun, 09 Oct 2011 13:56:00 +0000

A program of the Federal Ministry for Education and Research

New materials are the engine for new production processes and products. In addition, new materials make a significant contribution to cost reduction in production. After all, the share of material costs is the cost of production in the manufacturing industry, around 50 percent. Savings through the efficient use of resources can lead to considerable competitive advantage.
With the "Materials Innovations for Industry and Society - WING", which was launched in early 2004, will give the Federal Ministry for Education and Research (BMBF), the interdisciplinary materials technologies new impetus. Both the classical material development as well as the material-based chemical technology and nanotechnology materials concepts in their program and provide synergy effects will be felt for a new wave in industrial product development.

Worker village

noreply@blogger.com (Admin) — Sat, 01 Oct 2011 07:54:00 +0000

Today worker village is a must for big companies. Especially if you are mine company kind, you must create non-permanent buildings.

Conditions where your workers eat or sleep is directly associated to your work quality. But if you are a miner company in example you must think that you may move if you can’t find anything where you dig.

Worker village’s must be on quality of living containers style. All worker village houses must have a toliet, kitchen, a place to sit,a place to eat and a place to sleep. Quality span is also important in non-permanent buildings. You can stay the head of masters and a worker on the same type of house. This buildings give you change the style quickly and give a honor to master workers. Building company workers also use these worker villages. It’s very important to make this villages easy to move, cost saving and lighter.

Prefabricated Dormitories

noreply@blogger.com (Admin) — Wed, 28 Sep 2011 07:42:00 +0000

Prefabricated Dormitories are too important for lots of countries. Today one of the humanity’s biggest problem is illiteracy. In Africa there are 10 million children waiting for prefabricated dormitories. It’s so important because dormitory means hot meal and a safe place to sleep for school children in Africa.

It’s not possible to build school and dormitory to every little city. It’s some easy to give lesson for children in a single floor place. But it’s very hard to send them back their home everyday.

Africa also need prefabricated schools and prefabricated hospitals. They are calling especially Turkish and European prefabricated buildings companies to their cities. Because Turkey’s prefabricated building companies and their products like living containers, labor camp buildings and more are well known in the world and widely using in places. Turkey’s prefabricated building companies are also creating new conspepts for low cost buildings every year.

Pre-engineered Churchs

noreply@blogger.com (Admin) — Mon, 26 Sep 2011 17:37:00 +0000

Today it’s very famous on America and other Christian countries to create churchs on pre-engineered buildings. It has lots of reasons.

But first of all Churchs are very crowded places. People have to sit there. In an earthquake people are in danger.
But Churches of pre-engineered buildings are light weight structures . They are lighter than conventional buildings but too strong on an earthquake or storm.

Design is also important. A church must be a place where people like design. People like to come pre-engineered Churchs. They cost lower than conventional churchs. It’s important because poor places also need churchs but it’s very hard to collect money for building a church. Working with the only one structual build company means no need to talk with lots of people about problems. It’s easy to solve the problems also. If you are working in a conventional church you have to close it for repair.

Non-permanent buildings

noreply@blogger.com (Admin) — Fri, 23 Sep 2011 17:33:00 +0000

Non-permament buildings are energy and cost savers. They are more important today than ever. Government’s new style on nature policy and tax makes them vital.

Non-permament buildings today have a wide span of usage.You can use them as prefabricated schools, prefabricated dormitories, gsm shelters, shops, showroom, restaurants and more.

But there are some lack of information about non-permament buildings. They are especially in laws about them. First of all you have to take permissions to settle and use them. You must have building license and land must be converted. You may need aprrove of fire departmen authorities and pollution center. You need to go electricity department to use electricity. Today in Africa, especially prefabricated dormitories, prefabricated schools and more are non-permanent buildings. They need this prefabricated buildings every more and our companies are going there to settle non-permanent buildings and its products to there everyday more.

Modular steel buildings

noreply@blogger.com (Admin) — Thu, 22 Sep 2011 07:32:00 +0000

Modular steel buildings are the best way to add a steel garage or workshop to their houses. It’s easy to settle and quick ready time.

When you want to buy modular steel building, you must search and think on lots of things.First thing you must decide is why you need a modular buildings and what you are expecting from it. You may choose doors and windows side and size on modular steel building.

Modular steel building is choosable because first of all it’s low cost and easy to afford. It’s also very easy to design. You can use prefabricated buildings efficiently on all costs. This building will last on one week with all doors, windows and more. It’s energy and time saving. You can choose the quailty, color and more for your modular steel building. It’s also very safe on earthquakes and you change to stay il life is more accurate.

Modular Buildings

noreply@blogger.com (Admin) — Mon, 19 Sep 2011 17:25:00 +0000

Modular buildings have three components dimensionally. They made in factory. Simple modular builsings consists only a single structure. But more complex buildings need attach of several sections. Modular buildings today has a large span of usage.

They are using especially on storm ready countries. It’s very important having a house after a big natural disaster.Govertment may also build prefabricated dormitories, prefabricated schools, prefabricated hospitals, ablution units, gsm shelters because of vital needs.

A modular building is a custom instruction. You may change dimensions and places of rooms and more. In a modular building, all modules are totally self contained. This includes wiring, roof and more. Dimensions of module is only limited for easy carry rules. Because creating too large or heavy modules are hard to move, hard to settle and dangerous to carry. You may decide if you use modular buildings as permanent or non-permanent buildings.

Cost of prefabricated buildings

noreply@blogger.com (Admin) — Wed, 14 Sep 2011 17:12:00 +0000

Customers always ask about a prefabricated buildings’ part price. Because customers research for the parts but not all prefabricated buildings.

He may find cheapest prices than a prefabricated buildings company gives. But it’s only a part’s price.A prefabricated building is not only what parts costs total. There are lots of workaround besides parts. A prefabricated or modular building gives customer a change to choose what it will be looking.

Experience of handyman and constructor is also important for prefabricated buildings. Every kind of prefabricated buildings like prefabricated schools, labor camp buildings, accommodation container or other needs some product related skill. Today it’s hard to say every kind of these buildings will live on a lifespan. But technology on prefabricated buildings is raising everyday. Future’s buildings will be more safer, more custom and less cost. Also today’s complicated building instructions will be easier and more understandable.

Advantages of prefabricated dormitories

noreply@blogger.com (Admin) — Sat, 10 Sep 2011 06:54:00 +0000

Prefabricated dormitories are very advantageous to conventional dormitories. First of all you can make some changes on them on future requirements.

Also they are rapid to build. Prefabricated dormitories may build on normal times. But nature of making prefabricated dormitories is building them after a storm or earthquake. After a disease life is still going.So children need education still. Prefabricated schools for educating children in this bad situations. But a prefabricated school also need prefabricated dormitories.

Especially girl dormitories are important in Africa. African countries requires more prefabricated school and dormitories every year. There are lots of Turkish and European companies that making prefabricated buildings, pre-engineered buildings, light weight structures and more. African countries are paying good fot this type of buildings. African people also don’t have any prejudice about prefabricated buildings. So it’s very easy to work there and sell more prefabricated buildings to them.

Natural radionuclides in building materials

noreply@blogger.com (Admin) — Mon, 05 Sep 2011 10:57:00 +0000

With the use of rocks and soils for construction purposes may result in these materials contained on or made them released radionuclides to the exposure of the population. Of particular importance are the radionuclides from the radioactive decay series of uranium-238 and thorium-232 and the potassium-40.

The cause is due to natural radionuclides in building materials caused by radiation exposure during their stay in buildings:

by the radionuclides in building materials emanating from outside the body to gamma radiation, acting
from the inhalation of the materials in the rooms released radon and its decay products.

Investigation and assessment

For more than 20 years in Germany conducted studies and assessments of radioactive substances in building materials. The Federal Office for Radiation Protection (BfS) are of more than 1500 samples of stone, building materials and mineral residues data for the specific activities of the relevant radionuclides. At a large number of samples was also determined that radon release.

The mean of the natural radionuclides in building materials by the related local gamma dose rate (ODL) in buildings is about 80 nano-Sievert per hour (nSv / h). Values of dose rate above 200 nSv / h are rare.

The radioactive decay of radium-226 is produced from radon-222 from the viewpoint of radiation protection is of particular interest. According to recent findings in Germany a few percent of the population of lung cancer from exposure to radon and its decay products are attributed to buildings.

Radon is of particular importance

The radon release from building materials is determined by the specific activity of radium-226 and others, determining the radon transport material properties (eg porosity) determined. Studies show that in Germany not in large quantities traditionally used building materials concrete, brick, aerated concrete and calcium-generally the cause of the overruns by the Federal Office for Radiation Protection recommended annual average value of radon concentration in living areas. This is 100 Bq / m³ not exceed (see Fact Sheet Natural radioactivity in building materials). The contribution of radon-222 is made of building materials for radon concentration in dwellings with a maximum of 70 Bq / m³. In current commercially available materials values well below 50 Bq/m3 were determined.
Higher radon concentrations at various construction materials

Rates of release of radon, the higher concentrations in the area may result, were in Germany isolated residues of combustion of coal with increased Uran-/Radiumkonzentration (formerly known as "coal slag" regionally used as a filling of ceilings), and in exceptional cases, natural stones measured with increased specific activities of radium-226. Elevated levels of radon in houses of Mansfeld copper slag, despite the relatively high specific activity of radium-226 is not determined in this material. In some countries, higher levels of radon have been found in houses, those found in so-called chemical gypsum (the residue Phosphoritverarbeitung) and also in lightweight concrete produced using alum. Occasionally there are also above-average radon concentrations in the traditional areas of mining, overburden or waste materials if the ore was used as a building material with enhanced radium concentration, as concrete or mortar and aggregate for foundations and backfill in house construction.

According to information currently used in Germany were no materials for building purposes, which could result from increased concentrations of thorium relevant from the viewpoint of radiation protection, exposure to radon-220 (thoron) and its decay products indoors.
Industrial residues as secondary raw material

In some residues from industrial processes to enrich the natural radioactive substances. When using these residues, such as their use as secondary raw materials in the construction industry are increased radiation exposure of the population can not be excluded. To avoid this, in Part A of Annex XII of the Radiation Protection Ordinance (Ordinance) called [1], the residues at the landfill or recycling aspects of radiation protection should be considered. The also in Appendix XII of the Radiation Protection Ordinance established control limits for the recycling of these materials is ensured that the applicable guideline for members of the public, the effective dose of 1 mSv per year is not exceeded.

According to the Construction Products Directive (89/106/EEC) [2] a construction may not be placed on the market in the Member States of the European Union if it meets the essential requirements of hygiene, health and environmental protection, among other things regarding the release of dangerous radiation, met . This policy is being implemented with the Construction Act [3].

Natural radionuclides in natural stones

Because today in all areas of construction inside the house and outdoor amplified natural stones are used, was investigated by the BFS, with the support of the German Natural Stone 'Association in 2006, a number of commercially available tiles and other sheet materials of different origins on the levels of natural radioactivity and radiation protection point of view evaluated.

The focus was on gamma-spectrometric measurements of the specific activities of radium-226, potassium-40 and thorium-232. The results are summarized in the graph. The median values shown (central values) mean, which is half of the samples tested above this level and 50% below.

The material breakdown is at this point to the rock. It must be pointed out that are used commercially for reasons which are geared to the specific applications, the processing and maintenance of materials, not always correct rock names. It must be for "granite" is not necessarily about granite, but this term is also used for gneisses, diorites, granodiorites and other rocks.
Specific activities of the examined natural stones

The specific activities of the examined natural stones are available for potassium-40 in the range between 10 Bq / kg and 1600 Bq / kg, for radium-226 from less than 10 Bq / kg and 355 Bq / kg and for thorium-232 from less than 10 Bq / kg and 330 Bq / kg.

For comparison and will complement the above table and from the Pavlidou et al. [4] published values noted.
The potential radiation exposure from the different materials depends not only on the concentration of radionuclides and radon release from the nature of their usage.
EU recommendation "Radiation Protection 112"

For their evaluation, there is no binding legal basis. However, in the EU Recommendation "Radiation Protection 112" [5] one has simply been recommended to-use method that allows on the basis of the determined specific activities of the above radionuclides and an exploratory assessment of specific modeling assumptions. If you're in this to the generally accepted value of the effective dose of 1 mSv / yr for members of the population from radionuclides of natural origin (except radon) is oriented to determine that the investigated current building materials - even in large-scale applications - even the tested natural stones in buildings are fully used.

[1] Verordnung über den Schutz vor Schäden durch ionisierende Strahlen (Strahlenschutzverordnung - StrlSchV) vom 20. Juli 2001 (BGBl. I S. 1714)

[2] Lutz, H.; Springborn, M.: Die Bauproduktenrichtlinie - Gegenüberstellung und Abweichungen, Ernst & Sohn, Verlag für technische Wissenschaften GmbH, Berlin

[3] Gesetz über das Inverkehrbringen von und den freien Warenverkehr mit Bauprodukten zur Umsetzung der Richtlinie 89/106 EWG des Rates vom 21. Dezember 1988 zur Angleichung der Rechts- und Verwaltungsvorschriften der Mitgliedsstaaten über Bauprodukte (Bauproduktengesetz - BauPG) vom 10. August 1992 (BGBl. I, S.149)

[4] Pavlidou, S.;Koroneos, A.; Papastefanou, C.; Christofides, G.; Stoulos, S.; Vavelides, M. : Natural Radioacvtivity of Granites Used as Building Materials in Greece. Bulletin of the Geological Society of Greece, Vol. XXXVI, 2004

[5] European Commission: Radiation Protection 112 „Radiological protection principles concerning the natural radioaactivity of building materials“, Luxembourg: Office for Official Publications of the European Communities, 2000, ISBN 92-828-8376-0

One Example about Structural Materials

noreply@blogger.com (Admin) — Wed, 24 Aug 2011 08:53:00 +0000

1661 in Sweden as the first banknotes in Europe were put into circulation, the Chinese could already look back on about a thousand years of history they invented paper money.

But already they have no real paper used to produce their bills, but they made from a mixture of bark, hemp and rags to make them stronger and more durable.

Similarly, with today's modern banknotes, such as the euro. They are made of cotton, more precisely from the very short hairs of the cotton plant seeds that are incurred in the cotton production as a byproduct. Mixed with various adhesives for secret recipe, from the blank "sheets of paper" for printing the note produced.

While most industrialized countries can afford the cotton bank notes with modern safety features, is in many poorer countries are still "real" paper money in circulation. For about 20 years, there are also plastic banknotes. These so-called polymer bank notes do offer a longer durability and greater protection against forgery than the cotton bills, but they are also more expensive to manufacture and tend to heat sensitivity. You have not yet been set, but introduced worldwide in more countries one by one.

Advantages of Prefabricated Houses

noreply@blogger.com (Admin) — Mon, 22 Aug 2011 11:27:00 +0000

- Robust. Against earthquake risk, which is the largest natural disaster, Prefabricated Steel Building Systems of the same size but much stronger reinforced concretestructure. Total weight of the reinforced concrete building structure is approximately 80% due to slight lateral seismic loads greatly reduced.Earthquake is the fear of your life.

- Economical. Stage of price, quality, materials and brand is clear. No encounter with a surprise. Easy financing provides you with the shortest construction time.

- It is without error. Prefabricated Steel Building carrier panels that make up the entire computer-controlled manufacturing facility has been constructed there is a margin of error. The system allows for quality control at every stage of production.

- It's quick. Prefabricated Steel Building 150 m2 excavation phase of a turn-key condition of the building time of only 60 days of arrival. Reinforced concrete construction for the building of the same size is only 6 months in duration.

- Long-lasting. Prefabricated Steel Building all profiles zinc-coatedgalvanized high-or double-layer coating material is made from paint, applied during mounting structure providing a long life thanks to superior insulation technique.

- Attractive.Prefabricated Steel Building Systems offers the structures essential forearthquake zones. Fracture, work, rotation, does not crack. Steel structuredoes the risk of lightning grounding feature.

- Healthy. Prefabricated Steel Building provides high heat and sound insulation, water and corrosion will isolate your building. The upper level of firesafety.

Iron alloys

noreply@blogger.com (Admin) — Mon, 22 Aug 2011 08:36:00 +0000

Construction
Pure iron

Pure iron (Fe) is made in the micrograph composed of individual grains. These arise from the fact that the freely mobile in the melt during solidification of iron atoms arranged in a spatial lattice structure. Iron crystallizes in a cubic system at room temperature in the body-centered cubic (bcc) lattice. This is located at the middle of a cubic unit cell of another atom.

Centered cubic lattice

With increasing temperature, the lattice structure transforms to the face-centered cubic (fcc) lattice, is here in the middle of each side surface of another atom.

Face-centered cubic lattice
Alloys

For the practical application of the iron is alloyed with various elements, so as to obtain the desired properties. The various materials are usually prepared by melting together. These are formed depending on the alloy element out different lattice structures.
Storage mixed crystals / add mixed crystals

Mixed crystal deposition

The atoms of the alloying element are stored in the gaps of the iron lattice (interstitial). For this, the atoms of the alloying element can be much smaller than the iron atoms, eg Carbon, nitrogen, hydrogen and oxygen.
Substitution solid solution

The atoms of the alloying element replace individual iron atoms within the iron lattice, the atoms must be similar to the iron atom, eg Chrome.

Connection mixed crystals

The iron atoms with the atoms form new crystals of the alloy element, often with a different lattice structure. This requires an integer ratio. Carbon and nitrogen can form solid solutions with iron, both storage and connection mixed crystals.

Structure of iron-carbon alloys

The largest share of steel production, the so-called 'non-alloy structural steels'. These are iron-carbon alloy with a carbon content of from 0.06 to 0.3%. The quenched and tempered steels are a carbon content of 0.3-0.5%, tool steels with a carbon content of 0.5-1.5%.
Ferritic steels (ferrite - C content <0.02%)

Homogeneous solid solution, when cooled below 723 ° excretion of Fe3C
Hypoeutectoid steels (ferrite and perlite - C content of 0.02 - <0.8%)

On cooling, the γ-solid solution in α-solid solution is formed with a low C content, the remaining γ-solid solutions to increase their carbon content. When they reach 723 ° C and 0.8% perlite to disintegrate.
Eutectoid steels (pearlitic - C content = 0.8%)

On cooling, the eutectoid reaction takes place, is divided into α-iron and Fe3C. The mixture is lamellar pearlite.
Hypereutectoid steel (pearlite and cementite - C content of> 0.8-2%)

On cooling, formed initially Fe3C (cementite), the γ-solid solution depleted of carbon, until the eutectic reaction begins.
Austenitic steels (austenite)

Austenitic steels have always further alloying elements, since the γ-phase of pure Fe-C at room temperature is not stable.
Martensitic steels

Above the line ABCD (liquidus) of the material is molten. With increasing carbon content decreases the melting point of 1536 ° C to 1147 ° C (for cast iron at 1153 ° C), from 4.3% by mass, it increases again.

In the area above the line campaign AHIECF the material consists of a mixture of crystals and melt, below the 'solidus' is the solid state. On further cooling to room temperature still here instead of grid changes and formation of cementite.

In the area enclosed by the line NIESGN area consists of the Materials on the austenite in which the carbon is dissolved interstitially.

At point E, represents the maximum solubility of carbon, one with 2.06 mass% at 1147 ° C. Based on the so-called A3 line (GSE) can be the resistance of the austenite read: the temperature up remains to that of the austenite decreases with increasing carbon content up to 723 ° C (Perlitpunkt) and then again with further increasing carbon content to increase .

Below the GS line gradually decreases during the A1 and A3 temperatures by the limited range of the fcc lattice of austenite, the bcc lattice of the ferrite. The excess carbon is released into the austenite, because the ferrite can hold a maximum of 0.02 mass% of carbon interstitial. At 723 ° C, the austenite reaches a carbon concentration of 0.8% by mass and is transformed into the eutectoid pearlite structure. These are within the individual ferrite cementite with 6.7 mass% carbon.

Effect sizes

Alloying elements

The various alloying elements influence the transformation behavior and the regions of existence of the structural components. Here, solving elements that crystallize in the bcc lattice itself, preferably in the α-iron, fcc γ-iron in the crystallized elements (except aluminum). All atoms dissolve interstitially dissolved preferably in γ-iron. By the alloying elements, the temperature range in which there exists the γ-phase (increased Cu, Au, Ni, γ-Mn (fcc) C, N (interstitial) or reduced (Ti, V, Cr, Mo, Nb, W (bcc) Al (fcc) Si (kdp), P).

Cooling

Already a cooling rate of more than 1 ° / s affects the conversion processes, since rapid cooling of austenite required to segregate the carbon diffusion is hindered.

Manufacturing Progress of Prefabricated Building

noreply@blogger.com (Admin) — Sat, 20 Aug 2011 10:44:00 +0000

Prefabrication is manufacturing and producing of the components of a structure before building it and transporting complete produced pieces to the construction site where the structure is to be located. The term prefabrication also applies to the manufacturing of things other than structures at a fixed site.

The term is used to distinguish this process from the more conventional construction practice of transporting the basic materials to the construction site where all assembly is carried out.

It is frequently used when fabrication of a section of a machine or any movable structure is shifted from the main manufacturing site to another location, and the section is supplied assembled and ready to fit. It is not generally used to refer to electrical or electronic components of a machine, or mechanical parts such as pumps, gearboxes and compressors which are usually supplied as separate items, but to sections of the body of the machine which in the past were fabricated with the whole machine. Prefabricated parts of the body of the machine may be called 'sub-assemblies' to distinguish them from the other components.

What does Steel Construction Building Mean?

noreply@blogger.com (Admin) — Thu, 18 Aug 2011 10:39:00 +0000

Superior mechanical properties compared to other carrier systems,steel structures, has the static capabilities and ease of application. Steel construction, steel buildings, steel homes, steel building steel structures, such asa fast, safe and economical, and rapidly spreading due to the steel building system with specific standards.

Mostly steel structures, factory buildings, steel construction, steel, industrial buildings, aircraft hangars, sports facilities, hangars, steel construction, steel construction workshops, warehouses are steel construction.

Advantages of Prefabricated Buildings:

- Creating a modular construction system with the desired plan,

- Low-cost provision

- Quick and easy installation

- Easy transportation and storage

- Ensure the production of multi-storey

- Time and time again to be pluggable (assembly-disassembly feature)

- High insulation due to the energy savings provided by

- The modification of the plan and then add the facility to provide

- Ground for the basic require, there is sufficient grobetonun

- Environmentally-sensitive manufacturing and assembly is provided without anydamage

- Compatible with Human health and needs

- Prefabricated houses are good

Prefabricated and Non-Permanent Buildings

noreply@blogger.com (Admin) — Tue, 16 Aug 2011 08:56:00 +0000

Prefabricated buildings, electrical wiring, plumbing, paint, such as glass can be delivered, including, electrical, plumbing, paint, glass, except the delivery can be achieved. All materials used, and many are ISO 9001 certified by TSE. Raw materials used in the TSE and DIN norms.

Prefabricated buildings and container exterior, interior wall, ceiling and flooring as a coating material used in intermediate fiber cement sheets, brand of cement, silicate, and cellulose formed, is produced at high pressure and temperature ovens. Differences in temperature and climatic conditions on the sheet is deformed by this method are avoided.

Pre-manufactured light prefabricated buildings are pre-assembled on aconcrete floor. Prefabricated steel structure of the system to be the biggestadvantage is that earthquake-resistant and lightweight. Be made as soon as possible and provide rapid assembly of prefabricated structures, disassembled and reassembled many times under-Omas, the cause of these structures increases the preference.

Considerations When Buying Prefabricated Building

noreply@blogger.com (Admin) — Sun, 14 Aug 2011 08:53:00 +0000

Stock structure of a company producing company is stable. Prefabricated structure with high-quality steel construction and completely manufactured for use in buildings. It should resistant to harsh natural conditions. Ready-building IP component manufacturer and warranty service opportunityafter selling the company's product.

Purchased prefabricated structure, aesthetic, economic, and being modular,can be installed easily in the future where a spike should be removed.
Prefabricated structure extends a variety of special needs such as relocation and to respond to your requests. Prefabricated building materials must not be harmful to human health and the environment, definitely needs to address the material used in human health.

Prefabricated buildings and designs are produced to the extent requested. Ascan be single-storey structures can be produced in two or three floors. Productshipments in trucks, ships, cargo containers, rail or cargo aircraft and can be made. Plate panel system for downloading and installation of fiber cementstructures do not have to crane. Fiber cement sheet panel system buildings,cranes and building type should be bolted. Overseas packed in accordance with the rules of the international transportation and packaging

Prefabricated House Word Meaning

noreply@blogger.com (Admin) — Fri, 12 Aug 2011 08:50:00 +0000

The real meaning of the word as prefabricated, pre-production means a smallprefabricated house, despite the pre-production, and portable, ready-made,appealing to this sector also includes many component.

To give an example ofthis prefabricated house, prefabricated villa, prefab building, prefabricated building, prefab housing, prefab site, prefabricated social facilities, prefab shed, prefab construction, prefabricated field of study, prefabricated off site, prefabricated factory can speak as little short. Depending on the application of the word prefab cabins and prefab prefabricated containers covered by the pre-manufactured ready these structures.

Prefabricated Buildings

noreply@blogger.com (Admin) — Wed, 10 Aug 2011 08:46:00 +0000

Prefabricated buildings are ready, according to the purpose of variable width and length as applicable to any residential area, taking into consideration environmental conditions, internal plumbing, ready to be manufactured.

Prefabricated houses, are prepared according to international standards of sound and heat insulation, fire and earthquake durability. Upon request, variousalternative materials are used. Earthquake-resistant, practical and functional use of the prefabricated houses, prefabricated one-story, two-story prefabricated buildings offer opportunities for prefabricated and without bow windowed.

Prefabricated and Non-Permanent Buildings

Construction companies, prefer prefabricated construction site buildings to start more quickly. Prefabricated buildings are built in our factory is verycomprehensive. We are expert in the field of permanent and portable modularprefabricated buildings, designs and construction projects, fast, superior qualityand offer an economical solution with the expert team. Panelize Modular Buildings are designed according to all kinds of climatic conditions. These buildings are scalable by virtue of being dismantled and reused many times. Bolt-nut connection and mounting is very easy due to the being mild-contrcuted. These buildings can be shipped anywhere in the world very easily.

Statistical Treatment of Fracture

noreply@blogger.com (Admin) — Tue, 05 Jul 2011 08:34:00 +0000

This happens because the tensile properties of ceramics depend so critically on the size and geometry of the ever present flaws, there is considerable scatter in the values for the strength determined from a tensile, bending, or fatigue test. Ceramic parts produced from identical materials by identical methods fail at very different applied loads.

In order to design structural parts using ceramics, the probability that a flaw is present that will cause failure to occur at any given stress must be known.
The Weibull distribution and Weibull modulus provide one statictical approach to designing with ceramics.
The Weibull distrubition describes the fraction of samples that fail at different applied stresses. At low stresses, a small fraction of samples contain flaws large enough o cause fracture; most fail at an intermediate applied stress; and a few contain only small flaws and do not fail until large stresses and applied. To provide predictability, we prefer a very narrow distribution.

Toughening Methods 1

noreply@blogger.com (Admin) — Wed, 15 Jun 2011 08:31:00 +0000

Several methods are used to improve fracture toughness, which in turn leads to higher fracture strengths and higher service stresses. One traditional method for improving toughness is to surround the brittle ceramic particles with a softer, tougher matrix material. This is done in producting cermet cutting tools and abrasives, which are really composite materials. As an example, very hard tungsten carbide ( WC ) particles are embedded in a matrix cobalt metal.

The composite part retains the high hardness and cutting ability of WC, but the softer, more ductile cobalt deforms and absorbs energy.
Other cermets, such as TiC particles in a nickel matrix or TiB in a cobalt matrix, provide good high-temperature strength and corrosion resistance for applications such as rocket motors, and UO2 in an aluminum matrix serves as a nuclear fuel.
Another approach is to create ceramic matrix composites ( CMCs ) by introducing ceramic fibers or agglomerates into the ceramic matrix. When a crack tries to propagate in the matrix, it encounters the interface between the matrix and the ceramic fiber; the interface helps block the propagation of the crack.

Residual Stresses And Cracking

noreply@blogger.com (Admin) — Thu, 12 May 2011 08:28:00 +0000

Residual stresses are also produced because of the volume change.The surface of the quenched steel cools rapidly and transforms to martensite. When the austenite in the center later transforms, the hard surface is placed in tension, while the center is compressed. If the residual stresses exceed the yield strength, quench cracks form at the surface.

However; if we first cool to just above the Ms (Martensite Start) and hold until the temperature equalizes in the steel, subsequent quenching permits all of the steel to transform to martensite at about the same time. This heat treatment is called marquenching or martempering.

2011 Infiniti G25 Car Model

noreply@blogger.com (Admin) — Tue, 12 Apr 2011 08:25:00 +0000

The 2011 Infiniti G25 price was announced today as the new sedan that just joined the automaker’s G Line will be available at dealerships across US starting from September.

The 2011 Infiniti G25 shares its exterior appearance with the G37 while under the bonnet it features a smaller engine, which is a 2.5-litre DOCH 24-valve V6 that delivers a 218 HP punch with 187 lb-ft of torque. Power is sent to the wheels by a seven-speed automatic gearbox, and both RWD and AWD (intelligent all-wheel-drive) versions are available.

The three models that are offered are the G25 Sedan, G25 Sedan Journey and G25x Sedan AWD and on the standard equipment list customers will find leather seatings, aluminium interior trim, Automatic Temperature Control, a 6-speaker premium sound system, 17 inch alloys, Xenon lights, Vehicle Dynamic Control and the Traction Control System.

The 2011 Infiniti G25 price starts at 30,950 USD.

Infiniti press release :

Infiniti today announced a new addition to the popular Infiniti G Line, the G25 Sedan, which features a 2.5-liter V6 engine. It is scheduled to go on sale at Infiniti retailers nationwide in September, joining the Infiniti G37 Sedan, G37 Coupe and G37 Convertible. It will have a starting Manufacturer’s Suggested Retail Price* (MSRP) of $30,950 USD.

“With the new G25 Sedan, we’re broadening the appeal of the G Line with amodel designed to provide an additional choice for buyers looking for atrue luxury sedan, but who might not need the higher levels of performance provided by our larger engine-equipped G37 models,” said Infiniti Vice President Ben Poore, speaking at a media event at the 60th
annual Pebble Beach Concours d’Elegance. “The G25 is positioned in the heart of the luxury sport sedan market, allowing us to bring Infiniti’s Inspired Performance to a wider selection of buyers.”

The new 2011 Infiniti G25 Sedan shares the same dynamic exterior, interior and chassis as the G37, but with a smaller displacement engine.The 2.5-liter DOHC 24-valve V6 produces 218 horsepower and 187 lb-ft oftorque, versus the G37′s 3.7-liter DOHC 24-valve V6′s 328 horsepower and 269 lb-ft of torque. The G25 Sedan comes with a standard 7-speed automatic transmission and is available in both rear-wheel drive and intelligent all-wheel drive. Three models are offered: G25 Sedan, G25 Sedan Journey and G25x Sedan AWD.

The G25 Sedan’s extensive list of standard equipment includes leather-appointed seating, Shodo aluminum interior trim, 8-way power driver’s seat and 4-way power front passenger’s seat, Automatic Temperature Control, premium audio system with six speakers, XM® Satellite Radio (XM® subscription required, sold separately) and much more.
Other standard features range from 17-inch aluminum-alloy wheels, High Intensity Discharge (HID) Xenon headlights, 4-wheel Anti-lock Disc Braking System (ABS), Vehicle Dynamic Control (VDC) and Traction ControlSystem (TCS).

The G25 Journey model adds RearView Monitor, heated front seats, heated outside mirrors, auto on/off headlights, Dual Zone Automatic TemperatureControl and more.

“While the G25 Sedan serves as the entry into the G line, it still offers an impressive array of luxury features – from leather-appointed seats to satellite radio,” said Poore. “With inspired style and performance – backed by our unique customer care philosophy, the Infiniti Total Ownership Experience® – we are confident the new G25 willattract a lot of attention in the marketplace.”

Classic Design Concepts Firebreather price

noreply@blogger.com (Admin) — Tue, 15 Mar 2011 08:23:00 +0000

As we’ve mentioned before the Classic Design Concepts Firebreather is powered by a supercharged 6.2-litre V8 that produces 600 horses and at the exterior the car features a special treatment that reminds a little of the Pontiac Firebird.

You’ve seen the crew from The Smoking Tire play with it the video we presented a few days ago, now its time to find you what the Chevrolet Camaro based Classic Design Concepts Firebreather price is.
We won’t get into details as you can just view the photo gallery below the jump, but for those that are interested in getting personal with the Classic Design Concepts Firebreather then you should know each of the 50 units that will get assembled carries a price tag of 60,000 USD.