马鹿的起源进化与遗传多样性研究进展

马鹿是非常重要的物种资源,由于栖息地的流失和人为干扰进行近亲繁殖等导致野生马鹿数量急剧减少,而家养马鹿多经过改良,因此马鹿的纯种数量锐减。对马鹿进行分子遗传学研究不仅可以加深人们对马鹿起源和物种形成的认识,还能帮助开展遗传多样性保护研究。随着高通量测序技术、分子生物学和生物信息学的迅速发展,马鹿的起源进化研究已发展到全基因组水平,并取得了一定的成果。马鹿的起源进化研究从最初对体态外貌和染色体核型的研究逐渐发展到对DNA序列与生理指标的研究。文章回顾了近年来国内外对马鹿起源进化和遗传多样性方面的研究,从起源时间、起源地和迁徙路线等方面揭示了马鹿的演化历史,介绍了父系、母系和常染色体研究方面分析了马鹿遗传多样性选取的不同分子标记,为进一步揭示马鹿种群的遗传变异、分化情况、迁徙路线和系统发育关系等提供基础信息,同时为马鹿遗传资源的利用和保护以及马鹿产业的良性发展提供重要的借鉴与参考。     

湖南洋泉水库调度的最优气候决策方法探讨

充分利用气候资源作好水库水位（量）调度、提高水库在抗旱和发电中的经济效益,是当今水库调度决策亟待解决的一个重要课题.本文根据气象经济学原理,运用连续函数求极值方法,利用洋泉水库有关经济参数,建立水库气候最优调度决策,在水库的实际调度中应用,可取得明显的社会经济效益.     

青贮玉米蠕形菌的分离鉴定及其致病性分析

本研究为初步明确引起青贮玉米(Zea Mays L.)叶斑病的蠕形菌种类,采集疑似病斑叶片样本,对病原菌进行分离纯化,形态特征观察,ITS-rDNA序列和GADPH基因序列系统发育分析及致病性测定。形态学和分子生物学鉴定结果表明分离得到的142株病原菌为3属6种真菌,其中麦根腐平脐蠕孢(Bipolaris sorokiniana)和玉米生平脐蠕孢(B.zeicola)为优势病原菌,分别为77株和48株;其次为大斑病菌(Exserohilum turcicum)9株,疣状弯孢(Curvularia verruculosa)2株,新月弯孢(C.lunata)3株,穗状弯孢(C.spicifera)3株。致病性测定发现麦根腐平脐蠕孢和玉米生平脐蠕孢对青海省8个主栽青贮玉米品种均有致病性,其余4种病原菌的致病性各有差异。本研究初步明确引起青贮玉米叶斑病的蠕形菌种类及其致病性,为后续开展病害诊断及其综合防控奠定了基础。     

Penetration behavior of bath induced by top-blown gas jets for steelmaking converter

The cavity induced by top-blow gas jets impinging on the bath surface is one of most important parameters, which has overwhelming influence on the rate of slag formation and metallurgical performance. Water model experiments are conducted through a 1/10 scaled-down top-blown convertor. Effects of lance height and gas flow rate on penetration behavior are studied, and also the influence mechanism of liquid surface tension on penetration depth is addressed based on the experiments and theory analysis. An energy utilization index (EUI) is defined to reflect how much the impinging kinetic energy of gas jets are transferred into bath for formation of cavity, and an improved model is proposed to predict penetration depth of jets. The results show that penetration depth increases with lowering lance height and increasing gas flow rate, and impact diameter increases with increasing lance height, but is little affected by gas flow rate. Influence of liquid surface tension on penetration depth is enhanced with increasing surface tension and penetration depth. The EUI increases with increasing lance height, and a function relationship of it with lance height is obtained based on the experiments.     

Study on DAQ System by Using LabVIEW

Dong village is very valuable for research work because of its special regional and national character and rich cultural implication. In this paper, some information about the location, form and features of Dong village is given. Then, the relationship between the culture and the settlement is analyzed, which provides a clue for understanding Dong village and will be beneficial to creating modern human settlements.     

Seismic Behavior of Asymmetric Building under Pushover Analysis

Pushover analysis is a tool to study the inelastic behavior of structures under strong seismic action. The 3D-pushover analysis was performed to analyze the inelastic lateral-torsional coupled response of multistory asymmetric structures. The symmetric frame and frame-wall systems were studied in this paper, and the capability curve of the top displacement and base shear,the story drift and the position of rotation center were compared with reference to corresponding symmetric structures. The characters of inelastic response of multistory asymmetric structures were found. The conclusion provides reference for performance-based seismic design of asymmetric structures.     

基于圆盘渗透仪常用计算模型的比较和分析

圆盘渗透仪已成为一种常用的田问测定土壤导水参数的仪器，基于圆盘渗透仪在某一选定点测量的入渗时间以及与入渗时间相对应的入渗量，利用一些常用的计算模型来计算低基模吸力土壤表层的导水参数，如吸水系数、导水率和宏观毛管上升高度等。本研究在总结一些常用的计算模型的基础上，并结合实验和模拟的数据对其进行比较和分析，为利用圆盘渗透仪进行土壤水力特性的估算提供了一定的参考作用。     

弧形钢闸门抗滑稳定可靠性分析

以弧形钢闸门自重、静水压力、闸墩及护坡自重、闸墩基础与地基间的摩擦系数和基底粘着力等因素作为随机变量,探讨了弧形钢闸门抗滑稳定可靠性分析方法,建立了抗滑稳定极限状态方程。结合工程实例对弧形钢闸门抗滑稳定可靠性进行了定量分析,可靠性指标b为4.1688,失效概率Pf为6.717×10-5,并与传统的容许应力法作了比较。结果表明,该方法更科学、更合理、更具有实际意义。     

井灌水稻区渠道增温效果与其影响因素关系试验研究

通过田间试验 ,探求了三江平原井灌水稻区渠道内井水增温与其几个影响因素的函数关系 ,建立了经验模型 ,可供灌溉管理者及有关人士参考。