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This paper considers how to find some joint distributions and their marginal distributions of crossing time and renewal numbers related to two PHrenewal processes by constructing an absorbing Markov process.


Discrete singular convolution method with perfectly matched absorbing layers for the wave scattering by periodic structures


Absorbing water from soil by roots in vascular plants is an important physiological function and plays an essential role on their water balance.


Results showed that compared with farmland watersheds, runoff generation time in forest watersheds was delayed remarkably, and peak flow was reduced greatly, which indicates that vegetation played an important role in holding and absorbing rainfall.


The contents of the tested microelements in soil fauna had significant correlations with their environmental background values, litter decomposition rate, food habit of soil fauna, and its absorbing selectively and enrichment to microelements.

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 In view of the technical economy, this paper made an analysis of the heat loss component between the plate and covers of the medium and low temperature type collectors. Analysis indicated that as a first choice to use the sellecting coating to reduce radiation loss is reasonable. When the sellecting absorbing ratio of the plate is greater than a certain value, we must give attention to reduce the convection loss. When the collector with plate temperature smaller than 85° the reasonable range of absorbing... In view of the technical economy, this paper made an analysis of the heat loss component between the plate and covers of the medium and low temperature type collectors. Analysis indicated that as a first choice to use the sellecting coating to reduce radiation loss is reasonable. When the sellecting absorbing ratio of the plate is greater than a certain value, we must give attention to reduce the convection loss. When the collector with plate temperature smaller than 85° the reasonable range of absorbing ratio is not greater than 10.  从提高技术经济效果出发,本文讨论了中、低温集热器板—罩间热损失的组成。分析表明,首先着眼于采用选择性涂层以减少辐射热损失是合理的;当板的选择吸收比大于一定数值后,应当同时重视减少对流热损失;对于板温小于85℃的集热器,选择吸收比的合理值不大于10。  This paper is concerned with the problem of the radiation heat transfer in a coverglassabsorber system, it is of great importance in the use of solar energy and in the thermal design of building engineering. The first part of the paper presents a method for calculating the absorbed solar energy by the absorber and the transparaent covers in the system. The results of the calculation for two illustrative examples are given. The second part of the paper gives an analysis of the radiation heat loss by the... This paper is concerned with the problem of the radiation heat transfer in a coverglassabsorber system, it is of great importance in the use of solar energy and in the thermal design of building engineering. The first part of the paper presents a method for calculating the absorbed solar energy by the absorber and the transparaent covers in the system. The results of the calculation for two illustrative examples are given. The second part of the paper gives an analysis of the radiation heat loss by the absorber in the system consisting of an absorber with such a cover as has a significant transmittance in the infrared thermal radiation region. The obtained formula for the calculation of radiation heat loss is easy to use. The physical meaning of the formula is also obvious.  本文详细地讨论了太阳能利用及建筑热物理中经常遇到的多层透明盖板吸热板系统的辐射换热问题。文中第一部份提出了任意层透明盖板吸热板系统中,吸热板(墙)和透明盖板所吸收的太阳辐射能的计算方法,并给出了实例计算结果。文中第二部份讨论了在透明盖板对远红外辐射透明时,透明盖板吸热板系统中吸热板的净辐射热损的计算。文中推得的计算公式不仅使用方便,且具有明确的物理意义。  The seasonal heat storage of the nonconvective solar pond and the ground underneath is calculated theoretically according to the model.The results of calculation show that the solar pond and the ground underneath can absorb and store a large amount of solar energy for seasonal storage.Under the steady state of operation,the ground underneath provides an appreciable contribution to the total amount of seasonal heat storage of the solar pond.The results of numerical evaluation show that,if a constant rate... The seasonal heat storage of the nonconvective solar pond and the ground underneath is calculated theoretically according to the model.The results of calculation show that the solar pond and the ground underneath can absorb and store a large amount of solar energy for seasonal storage.Under the steady state of operation,the ground underneath provides an appreciable contribution to the total amount of seasonal heat storage of the solar pond.The results of numerical evaluation show that,if a constant rate of heat extraction from the bottom of the pond is assumed,the total amount of heat stored under the surface of a nonconvective solar pond 1m in depth at Beijing is about 94.6MJ/m,while 55.6% of the total amount is stored in the ground underneath,mainly concentrated in a shallow stratum of soil about 3m deep under the pond.  本文对非对流型太阳池和池下土壤的跨季度蓄热问题进行了理论分析。在稳定工况下,池下土壤对跨季度蓄热能起相当大的作用。若用恒定速率从池底提取热量,则计算表明:建在北京地区1米深的非对流型太阳池,其跨季度蓄热量可达94.6兆卡/米~2,而其中约有55.6％储存在池下土壤中,且主要集中在池底以下3米左右深度的土层内。   << 更多相关文摘 
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