云南戏曲源流考

云南戏曲从新石器时代或青铜器时代“沧源岩画”展示的原始戏剧开始,经历了部族乐舞、节会歌舞、宫廷乐舞、傩舞等初级戏剧阶段,走过了带有杂剧性质的“五花爨弄”和百戏性质的花灯漫长演变期后,至明代嘉靖年间,以《性天风月通玄记》和《宴清都洞天玄记》等剧本的创作为标志,云南戏曲进入了成熟时期。     

深厚覆盖层上某闸坝工程的应力应变分析

随着水电资源的继续开发,地质条件良好的坝址多已建坝,因此在深厚覆盖层上建坝的趋势日益明显．覆盖层具有结构松散、渗透性强、岩性不均匀等特征,使工程常遇到地基承载力低,不均匀沉降大,渗流不够稳定等问题．本文利用有限元软件对深厚覆盖层上某闸坝工程进行建模、计算,最终对计算结果进行应力应变分析,为工程应用提供有力依据．     

Microstructural evolution and performance of hydrogen storage and electrochemistry of Co-added La0.75Mg0.25Ni3.5−xCox (x = 0, 0.2, 0.5 at%) alloys

Microstructure, hydrogen storage and electrochemical performances of Co-added La_(0.75)Mg_(0.25)Ni_(3.5_x)Co_x(x = 0,0.2, 0.5 at%) alloys are studied. XRD and rietveld refinement results suggest that the samples are mainly composed of(LaMg)Ni_3,(LaMg)_2Ni_7 and LaNi_5 phases, Co substitution for Ni changes the phase abundance,but not the phase composition. With the rising of Co content, the amount of(LaMg)_2 Ni_7 phase decreases, but the amount of LaNi_5 phase increases, while the amount of(LaMg)Ni_3 phase firstly increases and then decreases.The alloys reversibly absorb and desorb hydrogen at 298 K smoothly. When Co content is 0.2 at%, the hydrogen absorption capacity reaches the maximum value of 1.14 H/M, and the absorption capacities reach 1.09 H/M and 1.03 H/M in the first minute at 298 K and 323 K, respectively. Electrochemical performance measurement results show that La_(0.75)Mg_(0.25)Ni_(3.5-x)Co_x alloys are completely activated within 2 cycles, and the cyclic stability of La_(0.75)Mg_(0.25)Ni_(3.3)Co_(0.2) alloy approaches 63.7% after 100 charge/discharge cycles, which is higher than that(S_(100) = 60%) of La_(0.75)Mg_(0.25)Ni_(3.0)Co_(0.5) alloy. Thus, the La_(0.75)Mg_(0.25)Ni_(3.3)Co_(0.2) alloy exhibits optimum comprehensive properties of hydrogen storage and electrochemistry.     

焖井时间对CO2吞吐开发低渗油藏影响机理研究

CO_2吞吐开发低渗透油藏具有投资少、见效快、见效时间长等优点,在开发复杂低渗断块油藏方面,其效果可与压裂法相媲美。影响CO_2吞吐采油效果的因素复杂,焖井时间就是其中一个重要参数。为此,针对室内实验存在最佳焖井时间这一现象,从CO_2移动前缘和开井生产时压力波传播前缘的相对位置关系分析了室内存在最佳焖井时间的原因;即CO_2移动前缘和开井生产时压力波传播前缘的相对位置不同,导致最终采收率及周期换油率不同,从而确定了最佳焖井时间。最佳焖井时间的确定对于提高低渗油藏开发效果具有重要作用。     

一个含有苯并15-冠-5单元的Ru(Ⅱ)多吡啶配合物的合成及性质研究

合成、表征了一个多吡啶配体(L)和相应的Ru(Ⅱ)配合物[(bpy)2RuL](PF6)2.在室温乙腈溶液中,该配合物在452nm显示特征的金属-配体核移跃迁吸收峰,在641nm显示特征发射峰.电化学测试显示配合物有一个基于钌(Ⅱ)的氧化过程和三个基于配体的还原过程.配合物与钠离子的作用通过紫外可见吸收光谱、发射光谱和电化学滴定进行研究.把钠离子加入到配合物的乙腈溶液中,配合物的荧光强度增加、紫外可见吸收蓝移、基于钌(Ⅱ)的氧化峰向阴极移动.     

浅析施工阶段的合同管理工作

针对施工阶段合同管理中存在的普遍问题,结合自己的实践经验,提出了加强施工阶段合同管理工作的具体措施,为施工阶段合同管理提供了可借鉴的经验.     

近56年来中国四季降雨事件演变特征的空间差异分析

全球气候变化背景下不同季节降雨及其贡献率的空间分异特征是学界关注的焦点问题之一。本文采用535个站点的日值降水数据分析了1961-2016年中国四季降雨的空间差异性。结果表明：①中国四季降雨雨量和雨日具有明显的“东南高-西北低”的空间分异特征,而中国四季降雨雨量和雨日贡献率的空间格局相比前者差异较大。②在变化趋势上,中国四季降雨雨量和雨日及其贡献率在冬季增加趋势最明显,夏季减少趋势最明显。在波动特征上,中国四季降雨雨量和雨日及其贡献率波动特征在冬季最大,夏季最小。③不同季节降雨雨量和雨日的差异表明季风边缘区是中国四降雨的重要分界线。四季降雨雨量和雨日贡献率的差异特征与前者相比差异较大。降雨贡献率有助于深化认识全球气候变暖背景下的降雨变化特征。     

茂名高岭土煅烧反应历程浅析

采用粉末衍射法XRD和DTG、DSC热分析法,对茂名高岭土高温煅烧反应历程进行了初步研究.DTG测得总失重率为14.41%;DSC热分析曲线显示在523.42℃和999.96℃有两个相变温度点,XRD检测证实它们分别是由原始晶相变成非晶相,然后再转变为莫来石晶相的相变点.煅烧反应主要经历了先脱除游离水后脱除结构水,即由高岭土→活性高岭土(偏高岭土)→莫来石的反应历程.     

PREDICTIVE STUDY ON THE ECONOMIC VALUE OF RADIO SPECTRUM IN CHINA

Increasing popularity of spectrum-based services brings the striking contradictions between the limited spectrum resource and its increasing demands.This paper puts forward an approach to forecast the future spectrum demand and its economic value,so as to offer a scientific basis for spectrum regulators to resolve this contradiction effectively and make a long-term spectrum-use plan.Specifically,this paper analyzes the driving factors of spectrum demand firstly,based on which a forecasting model is constructed to predict the spectrum demand and its deficit/surplus in the next few years.Then,a forecasting model to measure the economic value of spectrum is proposed based on marginal opportunity cost theory,and the indifference curve is introduced to show the economic value generated by additional spectrum.Additionally,an empirical study is conducted to forecast the spectrum demand and its economic value for China in the next 10 years according to the proposed method.The results of this study show that spectrum deficit is a trend in future and releasing additional spectrum will bring China huge economic benefits.     

试论中国大学“社会文明极”地位及其回归

大学的功能是探索真理、研究学问、创新知识、培养新人,其文明程度和文化程度总是整个社会的制高点;大学通过文化传播、规则传播、人才传播、制度传播等形式,扩散文明、引领社会文明进步,是社会文明极。但过度商业化的侵袭和改革滞后,使中国大学的社会文明极地位有所失落。必须通过重建大学理念、重塑大学宽松自由的办学环境、重构大学内部管理体制、重树大学校长的职务理想和文化自觉、重觅文人的内省传统等,使大学的社会文明极地位得以回归。