摘要：针对表层土壤水分测量速度慢效率低等问题,设计一种基于电容法的表层土壤水分传感器。区别于传统的插入式测量方式,设计并制作出共面交指型电容探头,实现表层土壤水分的快速测量。以河北廊坊地区的沙壤土作为实验样土,通过多项式拟合对传感器输出值进行标定,决定系数达到了0.98177,传感器的动态响应、稳定性以及灵敏度试验均能满足监测要求。分析环境温度变化对传感器输出的影响,对传感器输出结果与温度进行线性拟合,决定系数为0.98457。进一步测量传感器的测量敏感区域Ke,通过试验的方式确定了其纵向影响范围为4 cm。与TRIME-PICO64型插入式土壤水分传感器对比实验结果表明,设计的传感器与国外类似产品在性能上相当,但具有更高的性价比。最后通过对比实验分析得出,设计的土壤水分传感器能够实现土壤表层水分的快速测量,可有效解决表层土壤流动水分测量效率低的问题。

摘要：　　在一次题为经济新闻与改革发展的研讨会上,凤凰卫视分管财经节目副台长的发言引起了与会者的关注.他的一个论点就是电视日渐退出专业财经领域,他用凤凰卫视财经节目在2004年的实践说明了这一点:苦心经营的专业财经节目收视率非常低,吸引广告的效果也不好,凤凰将全面退出专业财经领域,转而改为社会财经.……

摘要：Covalent organic frameworks(COFs)have lately emerged as a blooming class of potential materials for photocatalytic water splitting because of their high crystallinity,huge surface areas,and structural ***,the photocatalytic performance for most pure COFs face some limitations factors,such as the significant recombination of photogenerated carriers and slow charge ***,a novel thioether-functionalized pyrene-based COF(S_(4)-COF)was effectively produced and chosen as a support for the immobilization of ultrafine gold nanoparticles(Au NPs).S_(4)-COF photocatalyst with Au as cocatalyst demonstrates remarkable photocatalytic activity with a H_(2) generation rate of 1377μmol g^(−1) h^(−1) under visible light(>420 nm),which is ca.4.5-fold increase comparing to that of pure S_(4)-COF(302μmol g^(−1) h^(−1)).Au NPs anchored on S_(4)-COF possess an ultrafine size distribution ranging from 1.75 to 6.25 nm with an average size centered at 3.8 nm,which benefits from the coordination interaction between thioether groups and ***,the produced Au@S_(4)-COF can generate a stable photocatalytic H_(2) generation during the four recycles and preserve its crystallinity structure after the stability *** Au NPs anchored on the S_(4)-COF photocatalyst can greatly accelerate the separation of photogenerated carriers and increase charge transfer because of the combined function of Au NPs and thioether *** a method can not only prevent the aggregation of Au NPs onto thioether-containing COFs to achieve long-term photostability but also allow uniform dispersion for an ordered structure of *** work provides a rational strategy for designing and preparing COF-based photocatalysts for solar-driven H_(2) production.

摘要：远程开放教育教学过程的设计以及教学过程质量管理,是现代远程教育中的核心问题。文章论述了教学过程优化设计的原则与具体的设计方法,并对开放教育教学过程的质量管理进行了全面阐述。

摘要：采用Fluent对4种选择性催化还原(SCR,selective catalytic reduction)脱销系统烟道弯曲段导流板设置方案进行了模拟,模拟过程基于标准K-ε湍流模型和2D模型,通过对速度分布图和进出口压力降的分析,探讨了导流板设置对烟道出口速度分布、压差和能量损耗的影响,得出结论:在烟道中设置导流板,可以显著改善流场的分布。而合理的导流板设计不仅能使流速变得均匀,而且还可以降低烟道的能量损失和压降。当导流板设计过大时,虽能更好的改善流场,但因其本身对流体阻力的增大,将导致烟道的能量损失和压降增大。研究结果对SCR脱销系统的研发提供了参考。

摘要：针对发动机冷却风扇支架在使用过程中出现异常断裂的问题,采用疲劳试验测试分析方法,采集了风扇支架的应力和发动机转速进行分析。通过color-map图分析出支架应力与发动机转速有关,并对不同阶次进行切片,发现发动机转速、支架应力以及模态频率之间的关系,利用提高风扇支架模态频率的方法改善了原方案并达到设计目标。

摘要：文章对学习资源建设相关文献进行了梳理,分析了学习资源建设流程和框架,以成人学习理论为支撑,结合大型企业学习资源建设经验与教训,对企业数字化学习资源建设进行了初步研究,构建了企业数字化学习资源建设框架(833框架),并对其中的需求、规划、分析、设计、开发、审核、应用、评价8个环节进行了阐述。

摘要：Solar-driven water splitting is considered as a promising method to mitigate the energy crisis and various environmental *** vanadate(BiVO_(4))is photoanode material with tremendous potential for photoelectrochemical(PEC)water ***,its PEC performance is severely hindered owing to poor surface charge transfer,surface recombination at the photoanode/electrolyte junction,and sluggish oxygen evolution reaction(OER)*** this regard,a novel solution was developed in this study to address these issues by decorating the surface of BiVO_(4)with cobalt sulfide,whose attractive features such as low cost,high conductivity,and rapid charge-transfer ability assisted in improving the PEC activity of the BiVO_(4)*** fabricated photoanode exhibited a significantly enhanced photocurrent density of 3.2 m A cm^(-2)under illumination at 1.23 V vs.a reversible hydrogen electrode,which is more than 2.5 times greater than that of pristine BiVO_(4).Moreover,the Co S/BiVO_(4)photoanode also exhibited considerable improvements in the charge injection yield(75.8%vs.36.7%for the bare BiVO_(4)film)and charge separation efficiency(79.8%vs.66.8%for the pristine BiVO_(4)film).These dramatic enhancements were primarily ascribed to rapid charge-transport kinetics and efficient reduction of the anodic overpotential for oxygen evolution enabled by the surface modification of BiVO_(4)by Co *** study provides valuable suggestions for designing efficient photocatalysts via surface modification to improve the PEC performance.

摘要：对国家实用新型专利“控制式无级变速装置”（专利号ＺＬ９５２４５５９１．９颁证日期９６－０９－１４），进行了运动学、动力学和机构学的分析研究，提供了该项专利技术的合理应用范围作为技术设计的依据。

摘要：通过元江～磨黑高速公路建设过程中 ,利用土石混合材料填筑路堤的尝试 ,对其设计方法和施工工艺进行探索 ,为进一步的专题研究提出一种思路。