MAPK信号通路在动物繁殖中的研究进展

在细胞中存在着各种信号转导通路,不同的信号转导通路相互交叉,形成复杂的信号转导网络系统,参与生物体内的各种生理生化功能,其中部分信号转导通路对动物的生殖生理有着重要作用。丝裂原活化蛋白激酶(mitogen-activated protein kinases,MAPKs)是细胞内重要的信号通路之一,其参与了多种生理过程的调节,对动物的繁殖有重要作用。文章将主要对MAPK信号通路在动物繁殖中的作用进行综述。     

Heat Transfer Performance of Capillary Mats Using Wet Construction in Winter

For the capillary mats using wet construction, a winter experiment designed to investigate the heat transfer performance was described, and the heat transfer performance analysis which contains the comparisons between different pipe space and different thickness of cement mortar surface was carried out. As a result, compared with that of the traditional radiant heating pipes, the capillary mats of wet construction require supply water with lower temperature, and it shows good heat transfer performance and system energy efficiency as well. According to the demand of indoor heat dissipation and human comfort as well as the coupling relationship between the temperature of supply water and surface construction thickness, it is suggested that the proper construction method should be comprehensively considered in practical applications.     

导入内蒙古白绒山羊杂交改良河西绒山羊的效果

以内蒙古白绒山羊良种繁育基地引进绒山羊为父本,河西绒山羊为母本,进行了杂交改良试验。结果表明：河西绒山羊导入内蒙古白绒山羊杂交改良,其杂交后代产绒量显著提高。     

Simulation for the Effect of Building Plan andOrientation on Natural Ventilation

Indoor thermal comfort can be significantly improved by natural ventilation with reasonable architectural design. In order to compare natural ventilation effect, the distribution of velocity field, temperature field and the PMV in different architecture layout and orientation design were analyzed with house types in Best House Type Competition. It was found that indoor natural ventilation effect was obviously improved by means of altering the layout and orientation, where the maximum velocity varied from 0.24m/s to 0.82m/s. And the temperature decreased 0.9℃ and the value of PMV was more approximate to comfort.     

Preconditioned GMRES(m) boundary element method for powerfrequency electric field of key devices within substation

The traditional direct iteration method has low computational efficiency, poor iterative performance and computational difficulties for the analysis of power frequency electric field (PFEF) of key devices within substation, especially involving multi medium.The preconditioning generalized minimal residual (GMRES) boundary element method (BEM) is proposed to enhance computational efficiency of three dimensional PFEF of key devices within substation, where it can’t be solved by the traditional direct iteration method. The basic principle and implementation steps are given. PFEF distribution of switch and break for 500kV substation switch field is presented to demonstrate the efficiency and accuracy of preconditioning GMRES BEM for studying large scale PFEF of key devices within substation. The proposed preconditioning GMRES BEM can not only improve convergence rate and residual convergence rate but also reduce computation cost without decreasing accuracy. Therefore, it is superior to direct iteration method and a suitable algorithm to solve the large scale systems arising from the PFEF of key devices within substation.     

Real-time measurement of the prompt neutron decayconstant based on 252Cf source

Prompt neutron decay constant is a key parameter in neutron action. Due to the real-time measurement demand for prompt neutron decay constant, a measurement method for prompt neutron decay constant is developed based on 252Cf Source and neutron pulse frequency spectrum measurement system. Triggered and initiated by 252Cf random neutron source, the pulse from detector is acquired and real-time converted to multi-channel data up to 1 GHz sample rate. The prompt decay constant can be acquired by utilize least squares of single exponential fitting to prompt decay curve based on prompt decay spectrum. The experimental result shows that prompt decay constant is 1.033μs-1 and the proposed method is a novel method for real-time measurement of prompt neutron decay constant.     

Bamboo simulation based on fractal algorithm

Fractal theories are quite popular in modeling and simulation of objects with irregular shapes. The combination of fractal theories and virtual reality technologies may be used to generate the realistic and complex nature objects. Plants simulation is one of the most important fields in computer graphics. The simulation algorithms of Bamboo are discussed. The conventional L-system modeling approach is improved based on the single-axis characteristics of Bamboo, and the relevant method, e.g. the displacement mapping technique used in Bamboo internodes modeling and rendering is discussed as well. Moreover, based on the basic idea of particle system, an improved simulation approach for distribution pattern of Bamboo is presented.This improved simulation algorithm can make the random distribution of particles break the rules of rectangular shape. Simulation results show that the proposed methods can simulate realistic Bamboo forms and distribution patterns in the nature.     

上楼问题的数学模型建立及其求解

上楼梯问题是一个经典名题,经常出现在各类数学竞赛中。本文利用组合数学及线性代数的方法对上楼梯问题进行了深入的讨论,得到了上楼梯问题中三种情况的通项公式。     

Participatory planning and monitoring of protected landscapes: a case study of an indigenous rice paddy cultural landscape in Taiwan

Paddy and Water Environment - Landscapes can be regarded as ‘a culture–nature link.’ Many examples of ‘living’ landscapes in the world are rich in natural and cultural...     

蒙古冰草MwDREB3基因的克隆及表达分析

以蒙古冰草(Agropyron mongolicum)为研究材料,利用同源序列法克隆得到1个DREB3类转录因子基因,命名为MwDREB3,采用实时荧光定量RT-PCR技术分析MwDREB3 基因的表达特征,为蒙古冰草优异抗性基因的挖掘和利用提供理论依据.结果表明:该基因全长1056bp,包含1个完整的开放阅读框,长度为774bp,编码257个氨基酸,该蛋白近5'端含有1个保守的AP2结构域.系统进化树分析表明MwDREB3 编码的蛋白与小麦(Triticum aestivum)的DREB、山羊草(Aegilops columnaris)DRF1的进化关系较近.该基因在干旱、高盐、ABA诱导条件下,表达量上调;在低温条件下,表达量下调.