高职院校辅导员素质结构分析与研究

基于问卷调查及统计分析,将高职院校辅导员素质分为：思政管理素质、职业指导和个人能力素质专业能力素质.在此基础上构建了象限模型,包括价值观维度、知识能力维度、社会认知维度和专业能力维度4个方面.其中价值观维度描述思想政治素质;知识能力维度描述个人综合素质;社会认知维度描述行业企业需求;专业能力维度描述专业技能要求.     

求解非线性方程的修正斯蒂芬森方法

提出了一种求解非线性方程的三阶收敛的修正斯蒂芬森方法.新的迭代公式每步仅需计算三次函数值,数值实验表明算法是有效的.     

Analysis of drilling failure in soft and hard sandwiching of coal seam

The severe abrasion of drill bits will be confronted during drilling in soft and hard sandwiching of coal seam. Not only does this failure result in the increasing consumption of bits, but also it delays the construction period, significantly extending the duration of the delay, even causing borehole instability, resulting in a catastrophic buried well accident. In order to reveal the failure causes, the authors of this paper researched the wear properties of the tooth of bit. As the thermal damage is one of the main threats to drilling failure in soft and hard sandwiching, thermal related effects on the wear performance of polycrystalline diamond compacts (PCD) were studied by an Amsler friction and wear testing machine. Meanwhile, silica sands were added to the interface of wear couples throw a funnel instrument to meet the demand that wear conditions correspond more closely to those in actual coal seam drilling. The friction coefficient and wear rates was measured. The X-ray diffraction analysis was used to investigate the chemical composition and crystal structure of the PCDs soaked at different temperatures. The morphologies of the surface of PCDs were examined by metalloscope and scanning electron microscopy. The results show that the wear rate and wear coefficient all rose with the increase of wear load. So the drilling load over proper operation limits especially when the equipment stuck happened is the primary threat to bit failure. On the other hand, the wear coefficient is not sensitive to the soaking temperature when it is under 700 °C. But it decreases obviously when the temperature was over 800 °C, which seems to be corresponding to the graphitization of diamond and the oxidation of Co. This phenomenon indicates that the high temperature over 700 °C is the main cause of the drilling failure.     

Effect of V content on microstructure and mechanical property of a TiVCuNiAl composite fabricated by spark plasma sintering

Ultrafine-grained (Ti₄₀Cu_22.9Ni_19.4Al_17.7)_x(Ti₈₀V₂₀)_1−x (x = 0.35 and 0.55) composites were fabricated by spark plasma sintering and crystallization of amorphous phase. Outstanding difference in microstructure and mechanical property is found for the two composites. Microstructure observation shows that the two composites all consist of body-centered cubic β-Ti and face-centered cubic (Cu, Ni)–Ti₂ regions but have opposite matrix and reinforcing phases. Meanwhile, mechanical property examination indicates that the composites for x = 0.35 exhibit far higher fracture strength and far larger fracture strain compared with the composites for x = 0.55 fabricated under the same parameter conditions. The different mechanical properties for the two composites can be explained by the different fracture mechanisms resulted from their different microstructures.     

Highly efficient solution-processed small-molecule white organic light-emitting diodes

Solution-processed small-molecule white organic light-emitting diodes (WOLEDs) were fabricated with a co-host of hole-transporter 4,4′,4″-Tris(carbazol-9-yl)triphenylamine (TCTA) and electron-transporter 2,7-Bis(diphenylphosphoryl)-9,9'-spirobifluorene (SPPO13). By doping 15 wt% FIrpic or F₃Irpic and 0.5 wt% Ir(MDQ)₂(acac) in to the TCTA/SPPO13 host, highly efficient white OLEDs have been achieved which exhibit nearly identical emission spectra at different luminance. The F₃Irpic and Ir(MDQ)₂(acac)-based WOLED shows maximum efficiencies of 40.9 cd/A, 36.7 lm/W and 16.9%, and even high efficiencies of 30.1 cd/A and 12.3% at the practical luminance of 1000 cd/m², which are among the highest efficiencies of the solution-processed small-molecule WOLEDs. These results demonstrate a convenient way to realize solution-processed WOLEDs with high efficiency and high spectral stability through full small-molecule materials system.     

Residual coal exploitation and its impact on sustainable development of the coal industry in China

Although China owns large coal reserves, it now faces the problem of depletion of its coal resources in advance. The coal-based energy mix in China will not change in the short term, and a means of delaying the coal resources depletion is therefore urgently required. The residual coal was exploited first with a lower recovery percentage and was evaluated as commercially valuable damaged coal. This approach is in comparison to past evaluations when the residual coal was allocated as exploitation losses. Coal recovery rates, the calculation method of residual coal reserves and statistics of its mines in China were given. On this basis, a discussion concerning the impacts on the delay of China's coal depletion, development of coal exploitation and sustainable developments, as well as technologies and relevant policies, were presented. It is considered that the exploitation of residual coal can effectively delay China's coal depletion, inhibit the construction of new mines, redress the imbalance between supply and demand of coal in eastern China, improve the mining area environment and guarantee social stability. The Chinese government supports the exploitation technologies of residual coal. Hence, exploiting residual coal is of considerable importance in sustainable development of the coal industry in China.     

基于RBF神经网络的FeO-MnO渣系ZGMn13堆焊焊条的设计

为设计一种ZGMn13堆焊焊条,提出了一种基于RBF神经网络的FeO-MnO渣系焊条配方优化设计方法.利用试验采集的数据对网络进行训练,以加工硬化后的硬度为优化目标,得到最优的焊条配方.试验结果表明:优化后熔敷金属的动载加工硬化性能和静载加工硬化性能良好.     

真空联合堆载预压下竖井地基固结解析解

考虑真空度沿竖井的发展是一个深度的函数,同时堆载所引起的附加应力既随时间变化也随深度变化,还考虑了地基的径竖向渗流以及扰动区土体水平渗透系数的3种变化模式,推导了真空联合堆载预压下竖井地基固结度的一个较普遍的解析解,并分析了在真空度沿竖井线性下降,堆载线性施加和附加应力沿深度梯形分布等情况下的地基固结性状。结果表明,荷载线性施加时,真空度对地基固结度有较大影响,真空度越大,沿深度衰减越慢,固结越快;而在荷载瞬时施加时,真空度对固结度没有影响。在地基井径比和水平渗透系数与竖向渗透系数之比较小时,地基的竖向渗流对地基的固结度有较大的影响。     

变热流条件下XPS板辐射引燃特性试验研究

为研究XPS保温板在变化热流作用下的引燃特性,对10组变热流条件下2.2,4.5cm厚XPS保温板辐射引燃特性进行了试验.测量了XPS保温板表面接受到的热辐射强度、引燃时间、表面温度以及质量损失速率.结果表明：0.0194kW/（m2·s）热流变化率不足以引燃XPS保温板试样;当热流变化率大于0.0373kW/（m2·s）时,在热流的作用下XPS保温板表面温度逐渐升高;当温度达到临界着火点时,XPS保温板瞬间燃烧,发出耀眼火焰和黑色浓烟,同时温度闪升至970.5℃左右;当有焰燃烧结束时,表面温度突降,燃烧过程结束;在有焰燃烧阶段,XPS板质量呈线性递减;临界着火点温度为336.0~387.0℃,且XPS保温板引燃时间与热流变化率具有乘幂关系,幂指数约为-0.765.     

外露式钢柱脚节点抗震性能试验研究

为了研究外露式钢柱脚节点抗震性能和提高外露式柱脚抗震设计的可靠性,本文针对外露式柱脚连接节点的抗震性能进行了试验研究,将两组不同的柱脚试件在循环反复荷载作用下的整体响应和各组成单元的局部响应情况进行对比。根据试验结果,分析柱脚节点在地震作用下的破坏特征、滞回特性、骨架曲线、延性及耗能指标。试验结果表明:两个试件的初始刚度基本接近,但是无翼缘支撑板的柱脚刚度退化要明显快于有翼缘支撑板的柱脚;有翼缘支撑板的柱脚的延性系数比无翼缘支撑板的柱脚提高约28.7%,而耗能系数提高约10.1%;翼缘支撑板可以提高柱脚的连接强度和承载能力,使得节点区域各构件的协同作用加强;柱脚区域的力学特性表明其破坏形式为半刚性特性且在柱根部出现塑性铰。