摘要：We develop a new kind of underwater inductive coupling power transfer(ICPT)system to evaluate wireless power transfer in autonomous underwater vehicle(AUV)docking *** that determine the performance of the system are systematically analyzed through mathematical methods.A circuit simulation model and a finite element analysis(FEA)simulation model are developed to study the power losses of the system,including copper loss in coils,semiconductor loss in circuits,and eddy current loss in transmission *** characteristics of the power losses can provide guidelines to improve the efficiency of ICPT *** results and simulation results are validated by relevant experiments of the prototype *** output power of the prototype system is up to 45 W and the efficiency is up to *** preliminary results indicate that the efficiency will increase as the transmission power is raised by increasing the input *** the output power reaches 500 W,the efficiency is expected to exceed *** efficiency can be further improved by choosing proper semiconductors and *** analysis methods prove effective in predicting the performance of similar ICPT systems and should be useful in designing new systems.

摘要：为了提出一种用于新开挖膨胀土路堑边坡加固的方法并揭示其作用机理,设计了一种柔性面层+土钉加固结构,并建立了相应设计方法;依托云南某高速公路弱膨胀土路堑边坡加固工程,进行了加固结构设计计算及现场试验;开展了加固结构的受力及变形监测,探究了加固结构的作用机理。研究结果表明:当柔性面层允许边坡法向发生3.0%的膨胀变形时,所受到的法向膨胀应力可较不允许发生膨胀变形时下降61.1%,设计的柔性加固结构可满足稳定性的要求。一年内,在雨季土钉中部轴力普遍出现增长,在旱季离坡面较近的土钉端头轴力显著减小;土钉轴力沿土钉长度方向总体呈现“中间大,两端小”分布,与锚杆框架梁相比,受力更为均匀;柔性面层网面的最大拉应变均出现在阶段性停雨后,具有明显的滞后性,且远小于材料极限伸长率;坡面土压力变化与高强加筋三维网应变变化规律基本一致,雨季呈波动增长,旱季缓慢回落,坡面土压力增值与计算所得膨胀力接近;随着土体雨季增湿膨胀、旱季干燥收缩,钢缆绳轴力变化呈现出缓慢增长、持续衰减及逐渐稳定3个阶段;3个监测点位中边坡坡顶水平位移最大,为5.4 mm,边坡整体稳定。监测结果综合反映了柔性加固结构“以柔治胀”的作用机理。所得结论可为新开挖膨胀土边坡的加固设计和施工提供参考。

摘要：方面级情感分析是自然语言处理领域中一项具有挑战性的细粒度情感分析任务。以微调预训练语言模型的方式广泛应用于方面级情感分析任务,并取得了明显的效果提升。然而,现有多数研究设计的下游结构较为复杂,甚至与预训练模型部分隐藏层结构重合,从而限制了整体模型性能。由于对比学习方法有助于改善预训练语言模型在词语级别和句子级别的表示,设计了一种结合自监督对比学习与方面级情感分析的联合微调模型(self-supervised contrastive learning aspect-based sentiment analysis,SSCL-ABSA)。该模型以简洁的下游结构联合两种学习任务,实现从不同角度微调预训练基于Transformer的双向编码器(bidirectional encoder representations from Transformers,BERT)模型,有效促进了方面级情感分析效果的提升。具体地,首先在BERT编码阶段,将评论文本与方面词拼接成两个片段输入BERT编码器,得到各词特征表示。之后根据下游结构需求,对不同的词特征采用池化操作。一方面池化所有词特征用于方面级情感分析,另一方面池化两个片段的方面词特征用于自监督对比学习。最终结合两种任务以联合学习的方式微调BERT编码器。在3个公开数据集上进行实验评估,结果表明SSCL-ABSA方法优于其他同类对比方法。借助t-分布随机近邻嵌入(t-distributed stochastic neighbor embedding,t-SNE)方法,形象地可视化了SSCL-ABSA有效改善了BERT模型的实体表示效果。

摘要：本文采用产业专利标准双导航方法,梳理了新能源汽车产业的市场规模、区域分布以及湖州发展现状,明确了产业创新着力点,给出创新布局设计与市场合作策略,为湖州市新能源汽车产业高质量发展提供了有力指引。

摘要：This study presents a robust design method for autonomous photovoltaic (PV)-wind hybrid power systems to obtain an optimum system configuration insensitive to design variable variations. This issue has been formulated as a constraint multi-objective optimization problem, which is solved by a multi-objective genetic algorithm, NSGA-II. Monte Carlo Simulation (MCS) method, combined with Latin Hypercube Sampling (LHS), is applied to evaluate the stochastic system performance. The potential of the proposed method has been demonstrated by a conceptual system design. A comparative study between the proposed robust method and the deterministic method presented in literature has been conducted. The results indicate that the proposed method can find a large mount of Pareto optimal system configurations with better compromising performance than the deterministic method. The trade-off information may be derived by a systematical comparison of these configurations. The proposed robust design method should be useful for hybrid power systems that require both optimality and robustness.

摘要：变形光学系统具有双平面对称性,其在两个对称面内的焦距不同。利用变形光学系统能够在使用常规尺寸传感器的情况下获得更宽的视场。本文根据变形光学系统的一阶像差特性,提出了一种设计折反式变形光学系统的方法。使用双锥面(Biconic Surface)面型设计了一个折反式变形光学系统。系统在X OZ面内的焦距为500 mm,在Y OZ对称面内的焦距为1000 mm。系统F-number为10,全视场角为1°×1°。系统在80 lp/mm处的全视场调制传递函数均值高于0.3。系统整体结构紧凑,成像质量良好。

摘要：为探究并行流道液冷板的散热性能,采用计算流体力学(CFD)数值计算方法对液冷板进行三维稳态分析,对比研究了液冷板在不同冷却液流量、流道宽度、流道深度和强化传热结构下的散热性能、均温性能以及能耗性能。结果表明:增加流量在一定程度上可以提升液冷板的散热性能,但持续增大流量不仅会增加系统能耗,而且改善效果十分受限。流道宽度从中心向两侧递减变化、流道深度减小、布置强化传热结构的设计都有利于提高液冷系统的散热和均温性能;相对于等宽(A5)流道设计,整体布置强化传热结构(S1)的流道设计可使液冷板的平均温度和最大温差分别降低8.9℃和9.06℃。本文研究成果可为电池热管理系统的结构设计提供理论指导。

摘要：目的为了实现钢桶轻量化设计,对考虑流固耦合的钢桶进行跌落仿真分析,在保证其抗跌落性能的条件下,对钢桶关键结构进行优化设计。方法以210 L钢桶为例,利用Ansys Workbench建立有限元模型,进行垂直跌落、棱跌落和角跌落等3种工况下的仿真分析;建立优化设计模型,进行多目标优化设计。结果得到钢桶在3种工况下的总变形量和等效应力情况,并发现钢桶跌落时的薄弱位置位于底部和环筋处,且在角跌落工况下受到的总变形量和等效应力最大;通过改变钢桶的壁厚和环筋距离进行多目标优化设计,得出优化设计点,当壁厚设置为1.1 mm,环筋位置对称且均为233.17 mm时,能够减小钢桶的重量并保证其抗跌落性能。结论通过对钢桶进行跌落强度流固耦合仿真分析和多目标优化设计,获得满足结构强度、减少材料用量的优化结构,降低了包装成本,为包装产品轻量化设计提供理论支持和设计参考。

摘要：Background People recently realized that it is important for artificial vascular biodegradable graft to bionically mimic the functions of the native vessel. In order to overcome the high risk of thrombosis and keep the patency in the clinical small-diameter vascular graft （SDVG） transplantation, a double-layer bionic scaffold, which can offer anticoagulation and mechanical strength simultaneously, was designed and fabricated via electrospinning technique. Methods Heparin-conjugated polycaprolactone （hPCL） and polyurethane （PU）-collagen type I composite was used as the inner and outer layers, respectively. The porosity and the burst pressure of SDVG were evaluated. Its biocompatibility was demonstrated by the 3-（4,5-dimethyl-2-thiazol）-2,5-diphenyl-2H tetrazolium bromide （MTT） test in vitro and subcutaneous implants in vivo respectively. The grafts of diameter 2.5 mm and length 4.0 cm were implanted to replace the femoral artery in Beagle dog model. Then, angiography was performed in the Beagle dogs to investigate the patency and aneurysm of grafts at 2, 4, and 8 weeks post-transplantation. After angiography, the patent grafts were explanted for histological analysis. Results The double-layer bionic SDVG meet the clinical mechanical demand. Its good biocompatibility was proven by cytotoxicity experiment （the cell＇s relative growth rates （RGR） of PU-collagen outer layer were 102.8%, 109.2% and 103.5%, while the RGR of hPCL inner layer were 99.0%, 100.0% and 98.0%, on days 1, 3, and 5, respectively） and the subdermal implants experiment in the Beagle dog. Arteriography showed that all the implanted SDVGs were patent without any aneurismal dilatation or obvious anastomotic stenosis at the 2nd, 4th, and 8th week after the operation, except one SDVG that failed at the 2nd week. Histological analysis and SEM showed that the inner layer was covered by new endothelial-like cells. Conclusion The double-layer bionic SDVG is a promising candidate as a replacement of native smal

摘要：文章针对水库河口消落区普遍存在的污染物削减能力弱问题,提出采用多级潜坝改造水文条件,构建表面流人工湿地,提升对径流净化效能的改造技术,并以碧流河水库八家河河口消落区为对象开展研究,分析改造工程前后区域水质变化。结果表明:随着水文条件的改变,挺水植物在没有人为干预的条件下生长状态良好,滩地植被条件也得到了明显改善;水淹区域本底污染物析出对湿地水质具有明显影响;研究区域对径流中TN和NO_(3)^(-)-N的去除效率在改造后得到了有效提高,对TN和NO_(3)^(-)-N的最高去除率分别达到72.6%和76.0%,但是对TP和NH_(3)^(-)-N去除效率的提升不明显。水文条件的改造能够有效提高水库河口消落区净化能力,有效削减流域入库污染物。