摘要：A prototype thick-GEM-based cooling storage ring external-target experiment(CEE) time projection chamber(TPC) is constructed and tested with the pulsed ultraviolet laser beams. The results indicate that the prototype TPC has a good performance in three-dimensional track resolution. In X direction the position resolution is about 0.2 mm, and in Y direction the position resolution is about 0.5 mm. The results also determine that the energy resolution is about 5.4%, which achieve the requirements of the CEE experiment and can be used to study the nuclear state equation and the quantum chromo dynamics.

摘要：分析虚拟样机技术在液压设备设计中应用的可行性,开发出基于SolidEdge、Ansys、Matlab、Access等功能软件,能完成元件选型、二维系统原理图和工程图、三维模型图设计、辅助装配、性能仿真、三维虚拟产品网络发布等功能的液压设备虚拟样机设计平台软件,并将其应用于攀枝花钢铁集团公司液压中心柱塞式伺服液压缸试验系统设计,结果表明该平台软件能有效缩短开发周期、提高设计质量。

摘要：The internal flow field of an axial-flow pump under low flow rate conditions is extremely turbulent. The unstable flow region is formed due to the tip leakage and the rotating stall, and is distinguished by a saddle patterned zone in its flow-head curve that demonstrates restrictions in its workable flow range. It is therefore important to understand and improve the operational characteristics of an axial-flow pump under low flow rate conditions. In this study, experiments are performed for the performances of an axial-flow pump at the flow rate in a range between 0.8Qd and 1.2Qd, with the internal flow field measured by the particle image velocimetry (PIV), and with the pump performances and the internal flow field simulated by the Ansys CFX. The simulation results agree well with the experimental results. From the predicted heads at the flow rate in the range between 0.1Qd and 0.7Qd by the numerical simulation, the complete flow-head curves are obtained. The streamlines and the velocity contours in the region in front of the impeller leading edge under different flow conditions are analyzed. By adopting the double-inlet structures, the flow-head characteristics are studied by varying the values of δ and σ respectively, where δ denotes the gap between the inner cylinder end and the impeller leading edge, and σ denotes the gap between the inner cylinder and the outer cylinder. The findings indicate that with the double-inlet design, the velocity distribution can be effectively improved in the region in front of the impeller leading edge, as well as the head performance under the low flow rate conditions, and the positive slope value of the head curve is reduced in the unstable flow range. The optimal δ and σ values are determined.

摘要：介绍了EPQ测试的原理、实施方法和评价方法 ,并由传统实施方法的局限性引出了计算机为测试工具的现代测试手段。主要从系统平台的选择、系统的功能模块设计、数据库设计和系统所使用的主要变量等几方面介绍了该系统的设计与开发。

摘要：基于电磁学原理,设计了一种液体粘度测量装置,介绍了其测量原理,搭建了测量装置,并对几种常见液体进行了测试实验。实验结果表明:测得的数据与液体粘度具有良好的相关性,反映了液体的粘度。该粘度测量装置结构简单,易于实现,由一对电磁线圈控制磁性活塞在液体中往复运动,通过测量活塞的运动时间来获取液体粘度。

摘要：This paper presents an efficient method for globally optimizing and automating component sizing for rotary traveling wave oscillator arrays. The lumped equivalent model of transmission lines loaded by inverter pairs is evaluated and posynomial functions for oscillation frequency, power dissipation, phase noise, etc. are formulated using transmission line theory. The re- sulting design problem can be posed as a geometric programJning problem, which can be efficiently solved with a convex opti- mization solver. The proposed method can compute the global optima more efficiently than the traditional iterative scheme and various design problems can be solved with the same circuit model. The globally optimal trade-off curves between competing objectives are also computed to carry out robust designs and quickly explore the design space.

摘要：为了解不同网箱参数下的流场适渔性情况,基于Realizable k-ε湍流模型,结合多孔介质理论,建立某深远海项目网衣的三维水动力模型。验证计算方法的可靠性,进一步分析在养殖海域中,流速、网衣线径、目脚长度、网衣间距等参数对流场适渔性的影响,并评估设计网衣的适渔性。结果表明,一定范围内较大的来流速度更有利于网后流场适渔性;网衣线径与目脚尺寸对适渔性的影响效果截然相反,线径越小,目脚长度越大,流场的适渔性一般越好;网衣间距变化对于网片间流场适渔性影响不大;设计网衣选型符合在养殖海域中的适渔性要求。

摘要：This article presents the design of a new implantable axial-flow blood pump. The special feature of the flow channel inside the blood pump is that the blood is driven by a big-small tandem impeller installed in the inner hole of the cylinder magnet of a brushless direct current motor. The inner hole makes the main flow channel possible, while the gap between the inner end of the stator and the outer end of the cylinder magnet gives the shape of the tributary flow channel. There is no motor magnet inside the main flow channel, therefore, more blood can pass through it. The gap of the tributary flow channel is very small, but the blood flow in it is not blocked. Thus, the efficiency is increased and the volume and weight of blood pump can be reduced greatly. The outer diameter, length and weight of the manufactured implantable axial-flow blood pump are 29.6 mm, 76 mm and 158 g, respectively. The impeller spins at the speed of 9000 rpm and can generate a pressure head of 100 mmHg and a flow rate of 8 L/rain. In an animal experiment, the blood pump has been successfully applied as a Ventricular Assist Device （VAD） in the chest of a small cow. Besides a mathematical model is established to simulate the flow inside an axial-flow blood pump of implantable VAD. The numerical studies on the performance of the implantable axial-flow blood pump are carried out by combining this mathematical model and the Fluent software. The numerical results agree well with those of experiments, with the maximum error less than 10%.

摘要：The integration and accommodation of the wind and solar energy pose great challenges on today’s power system operation due to the intermittent nature and volatility of the wind and solar *** efficient large-scale electrical energy storage is one of the most effective and economical solutions to those *** the comprehensive review of the existing storage technologies,this paper proposes an overall design scheme for the Non-supplementary Fired Compressed Air Energy Storage(NFCAES)system,including system design,modeling and efficiency assessment,as well as protection and ***,the design principles of the multistage regenerative,*** recovery system which is used to fully recycle and utilize the waste heat from compression are provided,so as the overall system efficiency evaluation *** paper theoretically ascertains the storage decoupling rules in the potential and internal energy of molecular compressed air and reveals the conversion mechanism of gas,heat,power,electricity and other forms of *** this basis,a 500-k W physical simulation system of CAES system(TICC-500,Tsinghua-IPCCAS-CEPRI-CAES)is built,which passed a system-wide 420-k W load power generation test with less pollution and zero carbon ***,the multi-form energy conversion of multi-stage regenerative CAES and storage efficiency is verified,especially its incomparable superiority in solving the uncertainty problem in wind and solar power ***,the propaganda and application scenario of the CAES system in China is introduced.

摘要：[目的]探索浸种和增温播种影响赤皮青冈种子萌发特征及相关内含物含量和酶活性变化的生理机制,为提高其发芽率和整齐度提供科学依据。[方法]以成熟的赤皮青冈种子为试验材料,设置2种播种温度和4个浸种时长的两因素析因设计实验,播种后定期观测种子发芽情况,并随机选取种子测定其内含物含量和酶活性。[结果]不同浸种水平下增温播种的赤皮青冈种子初始萌发时间提前,长时间浸种加增温播种能有效提高种子平均发芽速度,缩短平均发芽时间,提高种子发芽率。赤皮青冈种子萌发过程中内含物含量和酶活性在不同浸种和播种温度处理下变化规律基本一致,淀粉含量呈先升高后降低趋势,可溶性糖和可溶性蛋白呈先下降后上升趋势,氨基酸含量和CAT、POD、PPO活性总体呈波动下降趋势,SOD活性则保持动态平衡。浸种处理对赤皮青冈种子萌发过程中内含物含量和酶活性无显著影响,增温播种能有效将POD活性到达峰值时间提前,且浸种时间越长到达峰值时间越早,同时淀粉水解速率更快,氨基酸波动变小消耗变大,促使种子更易于打破休眠,更快萌发。4月种子集中萌发期,可溶性糖含量越高萌发整齐势越差,氨基酸含量和PPO活性越高初始发芽时间越早且发芽持续时间越短,此外PPO活性越高发芽势越大。[结论]长时间浸种配合增温播种能有效加快发芽速度,提高发芽率和整齐性。赤皮青冈种子在苗床加小拱棚增温播种条件下,浸种48 h种子初始发芽时间最早(82 d),发芽率最高(71.00%),萌发指数最大,萌发能力最强。