摘要：Exploring and designing a high-performance non-noble metal catalyst for hydrogen evolution reaction(HER)are crucial for the large-scale application of H2 by water ***,novel catalysts with NiMo nanoparticles decorated on reduced graphene oxide(NiMo@r GO)synthesized by a two-step hydrothermal method were *** characterization results showed that the prepared NiMo@r GO-1 had an irregular lamellar structure,and the NiMo nanoparticles were uniformly dispersed on the ***@rGO-1 exhibited outstanding HER performance in an alkaline environment and required only 93 and 180 mV overpotential for HER in 1.0 M KOH solution to obtain current densities of-10 and-50 mA·cm^(-2),*** tests showed that NiMo@rGO-1 had a certain operating stability for32 *** the same condition,the performance of NiMo@rGO-1 can be comparable with that of commercial Pt/C catalysts at high current *** synergistic effect between NiMo particles and lamellate graphene can remarkably promote charge transfer in electrocatalytic *** a result,NiMo@rGO-1 presented the advantages of high intrinsic activity,large specific surface area,and small electrical *** lamellar graphene played a role in dispersion to prevent the aggregation of *** prepared NiMo@rGO-1 can be used in anion exchange membrane water electrolysis to produce *** study provides a simple preparation method for efficient and low-cost water electrolysis to produce hydrogen in the future.

摘要：为了明确农田灌溉系统中渠道衬砌设计方法和温度应力分布,本文结合实际工程以过水能力和结构可靠性作为衬砌设计核心要素,采用有限元数值模拟方法给出了渠道衬砌设计方案以及不同衬砌厚度对温度应力极值出现时间的影响机制。结果表明U形混凝土衬砌在满足渠道过水能力的同时可满足结构强度需求。当衬砌厚度在10~12cm之间时,最大温度应力出现时间较早。该结论对于选择合适的衬砌厚度以及保温时间具有重要的工程意义,确保了渠道衬砌的质量和稳定性。

摘要：医疗数据是医疗体系最重要的支柱和驱动力,对于健康医疗领域的发展至关重要。针对目前医院存在的医疗数据造假、医疗诊断错误等问题,提出了一种基于区块链的医疗数据审计方法。从审计的视角出发,采用IPFS和区块链相结合的方式存储医疗数据,并借助智能合约进行医疗数据的存取和访问控制,保证医疗数据真实可靠和公开透明;然后,设计了一种基于注意力机制的深度学习医疗数据审计模型,自动提取医疗数据的关键特征,以求更精准地定位医疗数据审计线索。实验结果表明,构建的基于区块链的医疗数据审计方法不但能够保证医疗数据的可靠性,而且在审计线索定位的准确率和精确率上,相比现有审计模型均有一定程度的提升。

摘要：基于并联式轮毂电动机驱动实车构型,分析影响制动能量回收效率的主要因素,采用联邦卡尔曼滤波纵向车速估计算法,提出了三层式复合制动控制策略.该策略中的制动决策层根据踏板输入信号和行驶状态来识别制动工况,并进入相应的制动模式.制动控制层根据制动决策层的指令,在常规制动工况下通过粒子群优化(PSO)算法优化前、后轮电制动力矩分配,实现电池有效回收效率最大化;紧急制动工况下,通过模糊自整定PID算法实现车辆在不同附着路面上各轮滑移率的安全有效控制,优化了制动防抱死控制的鲁棒性,提高制动安全性.制动执行层响应制动控制层的指令,设计了电制动补偿机制,以迅速补偿调节各轮轮缸的压力误差,提高车辆制动稳定性.最后实车验证了该复合控制策略的有效性.

摘要：以海上风电工程的风机基础导管架吊装为研究对象,开展导管架吊耳设计及吊装技术研究,并采用有限元方法进行结构验证。结果表明,针对不同的吊装方法与不同的导管架结构形式,选择合理位置设置吊耳,可降低导管架吊装的施工难度,降低吊装风险,提高施工效率。

摘要：利用自主研发的煤体“吸附-力学-渗流”耦合特性测试系统,实验研究了瓦斯对煤体强度和吸附膨胀变形特征的影响,设计了不同围压和瓦斯压力条件下的三轴加载实验。实验结果显示,瓦斯显著削弱了煤体的强度,其中游离瓦斯的影响大于吸附瓦斯。煤体强度的削弱程度与瓦斯压力呈正相关关系,而围压变化对其影响较小。另外,通过对比分析发现,实验室实验法测得的含瓦斯煤体体积应变比理论计算法更为准确。实验室实验法能够为确定煤基质的吸附膨胀最大应变和吸附变形朗格缪尔压力提供可靠依据。

摘要：以深圳市某复杂地质条件的深基坑工程为例,详细介绍了该项目的设计全过程,包括设计重难点分析、支护方案选型、midas GTS三维有限元及理正深基坑整体计算分析,并与监测结果做了对比,表明本项目支护体系能有效控制基坑的变形,对于沿海地区复杂地质条件的深基坑工程具有一定的借鉴作用。

摘要：Wireless sensor networks have already enabled numerous embedded wireless applications such as military, environmental monitoring, intelligent building, etc. Because micro-sensor nodes are supposed to operate for months or even years with very limited battery power source, it is a challenge for researchers to obtain long operating hour without scarifying original system performances. In this paper, the energy consumption sources of the wireless sensor networks are firstly analyzed, with the digital processing and radio transceiver units being emphasized. Then, we introduce the design scheme of our energy-aware wireless sensor network (GAINS). In GAINS, techniques to conserve the energy are exploited including the energy optimization node, software and energy-efficient communication protocol. The design architecture of our ultra low power wireless sensor network (WO-LPP) is specially presented.

摘要：Water and sediment in four-inlet river system and the water level at Chenglingji reflect the current relationship between Yangtze River and Dongting Lake. Since the flow in four-inlet river system is reduced gradually, the lake water level is also reduced, resulting in shrunk lake area, channelized lake, narrowed channel and reduced rfve beach. Facing the changed relationship the River and the Lake after the utilization of Three Gorges Project, the Chenglingji control engineering at the outlet of Dongting Lake and the dredging of four-inlet river system are car- ried out. Thus the roles of flood control （1.67x101~ m3） and water amount regulation （2.3~101~ m3） of Dongting Lake are fully played. The Dongting Lake plays compen- sating and scheduling roles in the flood control and water storage of the Three Gorges Reservoir. It can reduce a volume of 4.0x109 m3 of excess flood around Chenglingji. In addition, it can also provide a water supply of 5 000 m3/s to the lower reaches of Yangtze River during the dry season for about 30 d. The Dongt- ing Lake plays an important role in the stabilization of ecological environment in the watershed, the regional water resources security and the protection of Dongting Lake and Yangtze River.

摘要：基于埃博拉病毒跨膜单链糖蛋白(single glycoprotein of ebolavirus,EBOV-sGP)为靶标,运用类药性评估、分子对接、ADME预测、结合自由能计算、分子动力学模拟等计算机虚拟筛选技术,从中药数据库TCMSP中挖掘抗病毒天然产物活性分子。以药效分子托瑞米芬(toremifene)为阳性对照,最终筛选出4个类药性良好的先导化合物MOL006834、MOL000174、MOL002192、MOL012524,它们与EBOV-sGP亲和力及相互作用基团均接近于toremifene。该研究结果可促进从中药天然产物库中提取、设计以及实验合成抗埃博拉病毒的药效分子。