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These may be biological like fungi, insects, birds, and animals or physical like shocks, abrasion, wear and tear, fire, water, or weathering agents such as pollution, rain and other atmospheric conditions.
These were generally classified into three categories (1) oil type like creosote compounds, (2) water soluble type like copper sulphate, mercuric chloride, with non-leaching additives like potassium chromate and (3) organic solvents like chlorinated phenols etc.
By utilizing specially innovative methods like chemical treatments, or impregnating the timbers with resins and compressing them, "modified woods" or "improved woods" could be produced to improve dimensional stability, water repellency, resistance to acids and alkalis, ultraviolet radiation, bio-deterioration, or thermal degradation.
Even today, in some countries hand tools are used commonly by professional experts and craftsmen.
Some innovative basic studies known as "nourishment theory" [29] are already available for understanding how density of wood depends on the interrelation between soil fertility, water transpiration and assimilation Some information is also available on the variation of density on other growth factors of trees.

Poly (vinyl alcohol) is one of the polymers of great importance in many applications, especially in commercial plastic uses, as it possesses a solubility in water.
As well as being soluble in water, slightly soluble in ethanol, however Insoluble in other organic solvents[9][10].
PVA it is an organic polymer and has a wide range of applications in the biochemistry, biomedical and pharmaceutical sectors, and the production sectors such as packaging due to its good compatibility with some substances, its ability to soluble in water and its relatively high ability to biodegrade in some environments, and it is considered one of the most studied materials for its use as an electrical insulating material and use in the applications , industrial , military, and space[11].
PVA polymer samples was dissolved for each sample in (15) mm of distilled water, and to ensure complete solubility of the polymer, a magnetic Heater Stirrer device from (LASSCO) brand of Indian origin was used.
Prentice Hall Professional, (2004) 16-21.

Through the close interaction with the manufacturing enterprises and ultimate consumers, the producer service providers form the manufacturing enterprise's producer service value network, coordinate different activities of the value network members, promote the professional knowledge and technology transfer, and increase the efficiency, quality and competitiveness of products and services.
The index value for logistics service factor is the added value of Transport, Storage and Post Industry; the index value for information service factor is the added value of Information Transmission, Computer Services and Software Industry; the index value for financial service factor is the added value of Financial Intermediation Industry; the index value for scientific research and technical service factor is the added value of Scientific Research, Technical Services and Geologic Prospecting Industry; the index value for business service factor is the added values’ sum of Wholesale and Retail Trades Industry and Leasing and Business Services Industry; the index value for ecological and environmental protection service factor is the added value of Management of Water Conservancy, Environment and Public Facilities Industry; the index value for education service factor is the added value of education Industry; the index value for public management service factor is the sum of Expenditure

However, contrary to the popular belief which tends to associate professional risk solely with oral communication, the use of natural written language in the workplace can introduce much higher risks than those of oral language because the writer and the receiver are not necessarily in direct contact where misunderstandings can be resolved.
Dynamic control rule: use of Arabic numerals 2(a) Refroidir la peau sous l'eau froide pendant 15 minutes (Cool skin under cold water during 15 minutes).

The advanced modeling tools can be used to produce the mountains, water, ripples, waves, particles and irregular shape, such as: the human body, plants, etc.
The high-quality film or video can be generated in a short time using other professional animation.

Despite to the decision of Russian Federation Health Ministry [15], many enterprises use sand as an abrasive material, banned in European countries as early as the 1950s – 60s of the 20th century, due to the high dusting and carcinogenicity of quartz dust for people (the professional disease of sandblasting operators is pneumoconiosis of the lungs [16]).
With the dynamic effect of solid particles on the metal surface and the presence of water, metal may corrode according to the reaction: Me + H2O = MeO + H2.

.- Part of the SAM Campania Ateco Code Investment (M€) Impact (M€) Occupation activated (Units of work) ∆GDP WORK 0,00 0,68   0,002% CAPITAL 0,00 0,77   FAMILY 0,00 2,50     BUSINESSES 0,00 0,57     01 Agricultural and hunting products and related services 0,00 0,02 0   40 Electricity, gas and steam 0,00 0,05 0   41 Collection and distribution of water 0,00 0,01 0   45 Construction 1,37 2,01 14   50 Trade, maintenance and repair of motor vehicles and motorcycles 0,00 0,03 0   51 Wholesale trade, excluding motor vehicles and motorcycles 0,00 0,04 0   52 Retail trade, excluding motor vehicles and motorcycles 0,00 0,07 0   55 Hotels and restaurants 0,00 0,01 0   60 Land Transport 0,00 0,05 1   73 Research and development (R&D) 0,00 0,00 0   74 Professional activities 0,00 0,15 1   75 Public administration and defense, compulsory social security 0,00 0,17 4   80 Education 0,00 0,13 4   85 Health and social services 0,00 0,07 1   90 Waste disposal, sewerage and similar services

It will bring the enterprise with double benefits while at significantly reduced cost by utilizing project consulting service offered by the external expert or the professional organization and facilitate successful informatization construction.
CHANG: China Water Transport, Vol. 10 (2003), p. 51-52 [5] Q.S.

The major issue that is behind the sustainable buildings is to moderate the negative impact of construction industry on environment such as ozone layer depletion, global warming, acid rain, acidification, water and air pollution and depletion of natural resources all of have importance in our daily life [11].
The professional organization and the construction stakeholders also stress on the benefits that are associated with sustainable design such as American institute of architect (AIA), National association of home builder (NAHB), American society of civil engineering (ASCE), and American society of heating, refrigerating and air conditioning engineer (ASHRAE).

Establishment of Mitra Bahari as a forum for cooperation between governments, local governments, universities, NGOs, professional organizations, community leaders and the business world 14.
Mayor authorized to provide HP3 in the Coastal Waters 1/3 of provincial jurisdiction Aspects of disaster mitigation in WP3K - 24.