the deterioration and preservation of paper: some,the rate and severity of deterioration result from internal and external factors: most importantly, the composition of the paper and the conditions under which the paper is stored. paper is made of cellulose -- a repeating chain of glucose molecules -- derived from plant cell walls..external factors influencing shelf life of bakery products,the extent of a cold shock depends on several factors such as the type of micro-organisms, temperature differential and the rate of cooling is essential (in both cases the larger it is, the greater the damage) 5. 3.1.3. freezing. during freezing, formation of ice crystals within the product changes the availability of water to participate in reactions..
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sulfate attack is one of the most damaging causes of concrete deterioration, causing either softening and decay of the concrete matrix (the ‘acid’ type of sulfate attack) or expansive cracking and other disruption associated with the formation of ettringite (calcium sulfoaluminate hydrate) and other reaction products within the hardened concrete.
pal natural environmental factors affecting the deterioration of materials include, but are not limited to, moisture, temperature, solar radiation, air movement and pressure, precipitation, chemical and biochemical attack, and intrusion by micro-and macro-organisms. natural factors, together with those expected to be a part
the first stage elicits the most common defects, their contribution to failure, symptoms of poor and critical roofs, and impact of roof deterioration on other components.
the screening of factors potentially associated with the deterioration rate of fresh cut lettuce in map provided further evidence of critical involvement of storage temperature and wounding on the rate of deterioration and identified the effect of other factors, such as leaf maturity, sample loading size, humidity, ethanol, and hexanal, on deterioration.
factors affecting deterioration of materials and components in structures mab1033 structural assessment & repair faculty of civil engineering, universiti teknologi malaysia category types sub-types weathering factors radiation solar nuclear thermal temperature elevated depressed cycles water solid (e.g. ice, snow)
except for the decay caused by cataclysmic events, the principal natural environmental factors affecting the deterioration of materials include, but are not limited to, moisture, temperature, solar radiation, air movement and pressure, precipitation, chemical and biochemical attack, and intrusion by micro and macro-organisms.
the radiation that penetrates the atmosphere can result in the deterioration of organic materials. though the penetrating powers are not great, the action tends to be confined to surface layers. for example, many organic dyes are degraded by ultraviolet light, as are
the rate of seed deterioration is highly influenced by environmental (temperature, relative humidity and seed moisture content) and biological factors (such as fungi that create their own biological niche) (ghassemi- golezani et al., 2010). seed longevity is determined by seed moisture, temperature and seed attributes that are influenced by genetic and environmental interactions during seed maturation,
predictive factors affecting early deterioration of axial symptoms after subthalamic nucleus stimulation in parkinson's disease. umemura a(1), oka y, okita k, toyoda t, matsukawa n, yamada k. author information: (1)department of neurosurgery, nagoya city university graduate school of medicine, mizuho-ku, nagoya 467-8601, japan. [email protected]
it was also demonstrated that mechanical circulation of fat, as required in an externally heated fat system, significantly increased that rate of fat deterioration when compared to fat heated by conventional direct gas-heat, if both were heated and maintained at 375f for identical periods of time.
the factors discussed include oxygenation, infection, age and sex hormones, stress, diabetes, obesity, medications, alcoholism, smoking, and nutrition. a better understanding of the influence of these factors on repair may lead to therapeutics that improve wound healing and resolve impaired wounds.
• the most important of the natural influences are geological, hydrological and climatic, since these • affect the quantity and the quality of water available. • their influence is generally greatest when available water quantities are low and maximum use must be made of the limited resource; for example, high salinity is a frequent problem in arid and coastal areas.
the rate of mechanical deterioration of cellulose insulation is dependent on the conditions of its use. those factors of major importance are the temperature applied and the presence of oxygen and moisture. moisture even in small amounts greatly affects the mechanical stability of the cellulose insulation. in general, the mechanical life of the insulation is reduced by half for each doubling
technical paper the effects of deterioration and technological levels on pollutant emission factors for gasoline light-duty trucks qingyu zhang a, juwang fan , weidong yang a, bixin chen , lijuan zhang , jiaoyu liu , jingling wang , chunyao zhou, and xuan chenb acollege of environmental and resources sciences, zhejiang university, hangzhou, people’s republic of china; bchinese research academy
environmental or biological factors that promote or contribute to deterioration processes of the fabric of heritage sites. since effects of decay cannot be attributed to a single factor, consider all elements. use “air pollution” for air pollution. use “climate change and severe weather events” for severe weather, including flooding.
microorganisms, action of enzymes, chemical reactions, physical changes, time, and. insects and/or rodents. these causes are not isolated in nature. bacteria, insects, and. light, for example, can all be operating simultaneously to deteriorate food in the field or. in a warehouse.
2. storage conditions. 3. deterioration. 4. expiration. drug quality influences treatment efficacy and safety. quality depends on correct manufacturing and storage: high-quality drugs are available when using rational buying procedures and when suppliers are reliable. it is also essential to ensure optimum transportation and storage conditions.
cracks. these factors, in turn, lead to pumping and crack deterioration through faulting and spalling. continued pump ing eventually leads to a loss of support beneath the slabs, which greatly increases load-related stresses in the slab and can result in fatigue cracking. thus, the transverse cracks must
it has been found that the major causes of pavement deterioration are structural factors which are interlinked with excessive traffic and loading. moreover, the sub soil factors and drainage conditions also affect the pavement condition considerably.
factors affecting deterioration of transverse cracks in jointed reinforced concrete pavements jointed reinforced concrete pavement (jrcp) develops transverse cracks as the drying and thermal shrinkage of the concrete is resisted by friction with the supporting layers.
the four major factors which affect nutrient degradation and can be controlled to varying extents by packaging are light, oxygen concentration, temperature and water activity.
we here investigated the pattern of relapse and potential factors affecting disease progression with ps deterioration during the first-line egfr-tki therapy. methods: consecutive 48 pts with advanced egfr-mutant nsclc who had had ps of 0-2 and then recurred after the initiation of egfr-tki therapy in the first-line setting between 2003 and 2012 were retrospectively assessed.
factors and type of stone deterioration phenomena affecting nikka stone at present include detachment, flaking, powdering, and cracking caused by the decay of components; these lead to changes, such as hardening of the stones (nakamura et. al., 2012 and young et. al. 2004). there are also several types of detachment caused by changes in stone
based on domestic large-scale underground powerhouse cases in the past two decades, key factors affecting the deformation and failure of the surrounding rock mass are summarized in this paper. among these factors, the two most fundamental factors are the rock mass properties and in situ stress, which impart tremendous impacts on surrounding rock mass stability in a number of cases.