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cold environment
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  环境冷
    The availability of the rate of heat loss (H, kcal·h~(-1))of a small black bulb for the assessment of the severity of cold environment was studied.
    本文目的为探讨小黑球散热率(H,kcal.h~(-1))作为环境冷强度综合评价指标的可行性。
短句来源
    STUDY ON HEAT LOSS RATE OF SMALL BILACK-BULB FOR EVALUATION OF COLD ENVIRONMENT
    小黑球散热率综合评价环境冷强度的探讨
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  cold environment
In many applications of piezoelectrically controlled smart structures, the functionality of the system has to be ensured even in an extremely hot and cold environment.
      
Sympathetic denervation of IBAT prevented the effect of the cold environment on GABA content and impaired that on GABA accumulation.
      
Polar organisms should have mechanisms to survive the extremely cold environment.
      
A theoretical study shows that when a thermally thick sample is allowed to radiate instantaneously into a cold environment, then the resulting transient surface temperature depends solely on its hemispherical total emissivity and effusivity.
      
Survival of young and old rats in a cold environment
      
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The availability of the rate of heat loss (H, kcal·h~(-1))of a small black bulb for the assessment of the severity of cold environment was studied. A hollow red copper bulb with the wall thickness of 1 mm and outer diameter of 6 cm was used. It contained 105 ml of water and its outer surface was coated with a thin layer of non-reflecting paint. From the time (h) required for the decrement of water temperature from 25 to 15℃, the H was calculated. Using the data of 86 measurements conducted in a field study,...

The availability of the rate of heat loss (H, kcal·h~(-1))of a small black bulb for the assessment of the severity of cold environment was studied. A hollow red copper bulb with the wall thickness of 1 mm and outer diameter of 6 cm was used. It contained 105 ml of water and its outer surface was coated with a thin layer of non-reflecting paint. From the time (h) required for the decrement of water temperature from 25 to 15℃, the H was calculated. Using the data of 86 measurements conducted in a field study, the regression equation between H and meteorological parameters,i.e. air temperature (Ta, ℃), wind velocity (V, m/s) and solar radiation (R, kcal.m~(-2).h~(-1)), was established. H = 1.8586- .14337Ta + .079929V~(1/2) (25 - Ta) -.020406RIa, r=.936, R~2=.875, where Ia is insulative value (clo) of air boundary layer and can be obtained by well known equation. From above formula an air temperature of equal H can be yielded by following equation assuming that the solar radiation is absent and the air is calm (V=.35 m/s), and we called this temperature The Equivalent Heat Loss Temperature (EHLT,℃). EHLT=15.948-5.2449H. Further analysis indicated that being assembled the effects of Ta, V and R, the H and/or EHLT could be used as a single indice to appraise the stress of the cold environments.

本文目的为探讨小黑球散热率(H,kcal.h~(-1))作为环境冷强度综合评价指标的可行性。紫铜质小黑球壁厚1mm,外径6cm,外喷无反光黑漆,内注105ml水,由水温自25℃降至15℃时间(h),求出H_。H与气温(Ta,℃)、风速(V,m/s)及太阳辐射(R,kcal.m~(-2).h~(-1))的回归方程为H=1.8586-.14337 Ta+.079929√(?)(25-Ta)-.020406RIa,r=.936,R~2=.875,Ia为空气隔热值(clo),可由通用方程求得。由此推导出无太阳辐射、无风情况下,H相同时的Ta,称为“等散热温度”(Equivalent Heat Loss Temperature,EHLT),EHLT=15.94-5.2449H。H及EHLT受Ta,V,R三者综合影响,作为环境冷强度综合评价指标的可行性是存在的。

A high resolution record from a 78 cm long lake sediment core from northern China on the basis of 210Pb and AMS 14C dating is presented. The hydrological closed Daihai Lake is located in a transitional zone of semi arid and semi humid which is sensitive to environmental change around the watershed. The pollen assemblages, calcareous shell of ostrocodes and geochemical record since the last 500 years indicate a rapid response of chemical weathering and biocommunity to the Little Ice Age climate oscillation....

A high resolution record from a 78 cm long lake sediment core from northern China on the basis of 210Pb and AMS 14C dating is presented. The hydrological closed Daihai Lake is located in a transitional zone of semi arid and semi humid which is sensitive to environmental change around the watershed. The pollen assemblages, calcareous shell of ostrocodes and geochemical record since the last 500 years indicate a rapid response of chemical weathering and biocommunity to the Little Ice Age climate oscillation. Our results show decrease of both pollen and chemical weathering intensity (higher Rb/Sr ratios in the lake sediments), and prosperous Limnocythere inopinata recorded in lake sediments during the Little Ice Age. These phenomena suggest the Little Ice Age is characterized by arid and cold, resulting in a lake water with a higher degree of mineralization (4 245 mg/L) of lake water. Under arid and cold environment, decline of vegetation results in weaker chemical weathering and stronger dust storm around the watershed. The respond of variations of ostrocodes abundance and species to environmental change is the most rapid, whereas plant growth regulation to it is relatively slow. This cold event recorded in the lake sediments appears to be contemporaneous with the events identified in the decrease of lake level in the African lakes, and in other independent signals from the glacier advance in the Qinghai Xizang Plateau and South Norway, and in the sea surface temperature decrease of North Atlantic, further suggesting that these cold fluctuations should be resulted from a larger regionally atmospheric circulation change during the Little Ice Age.

岱海近500年沉积物的孢粉、介形类和地球化学记录表现了流域生物、化学风化对全球性小冰期气候波动明显而快速的响应。孢粉量的下降、化学风化强度的减弱(高Rb/Sr比值)以及意外湖花介(Limnocythereinopinata)的繁盛反映了小冰期最盛期岱海地区以干旱为特征的气候环境及其造成的高矿化度湖水。其中,介形类丰度及种类对环境变化的反应最迅速,植被生长的调节则要缓慢一些。内陆湖泊流域植被的衰弱与干旱环境下化学风化强度的减弱以及风尘作用的加强是相辅相成的。

The progress of the experimental study of the vegetation restoration and revegetation during the constructing of the Qinghai-Tibet Railway is stated in this article. The statement includes the background, the study purpose, the experimental technical method, the result analyses and the primary results. The study focuses on a field investigation project in Tuotuo River and a vegetation revegetation project. The study results indicate that the soil quality is largely changed by human activities during constructing...

The progress of the experimental study of the vegetation restoration and revegetation during the constructing of the Qinghai-Tibet Railway is stated in this article. The statement includes the background, the study purpose, the experimental technical method, the result analyses and the primary results. The study focuses on a field investigation project in Tuotuo River and a vegetation revegetation project. The study results indicate that the soil quality is largely changed by human activities during constructing and the soil quality is degrading obviously. For the vegetation restoration and revegetation during the constructing of the Qinghai-Tibet Railway, the surface earth should be backfilled. The field investigation indicates that Elymus sp. and Poa. Sp. , etc. are adapted to the high and cold environment around the railway, and they can grow naturally in the growing seasons. Raining season, i.e. the warming season, is the good time of vegetation restoration and reyegetation. In this way a high success percentage of vegetation restoration and revegetation can be seen.

对青藏铁路高寒草原植被恢复与再造的试验研究工作进行了综述分析,通过对青藏铁路建设中沱沱河试验段工程取土场的现场调查和植被恢复试验研究,结果表明:工程活动后取土场的土壤条件变化很大,质量明显下降,为做好青藏线建设过程中的植被恢复与重建,应切实作好表土回填工作。从现场试验结果来看,披碱草、早熟禾等均能较好地适应高寒草原的取土场环境,植物在生长季节能正常生长。在植被恢复的时间选择上应尽量利用青藏高原雨热同季的特点,可提高植被恢复的成功率。

 
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