摘要：The super-high speed high temperature superconductor （HTS） maglev evacuated tube transport （ETT） is a promising transport mode for the future. As a key component of the HTS maglev vehicle, the permanent magnet guide- ways （PMGs） with different geometrical configurations and iron yoke widths are analyzed by finite element method （FEM）. The levitation force of a single onboard HTS maglev device over the designed PMG at different field cooling heights （FCH） is measured by magnetic levitation measurement system. Based on the designed PMG and experimental results, a preliminary scheme of subterranean super-high speed HTS maglev ETT is described in this paper. The HTS maglev ETT is mainly composed of an evacuated tube, HTS maglev vehicle, PMG, propulsion system, station, emergency rescue system, etc. In addition, a subterranean tube that consists of foundation tube and vacuum airproof layer is introduced. In order to convert the stress caused by the air pressure difference between inside and outside of the vehicle, a multi-circular vehicle body is designed. The vehicle is driven by a linear motor propulsion system under the control of a ground controlling system. The scheme of long-distance super-high speed passenger transportation is accomplished by the connection of different vehicles.

摘要：In the design of a hypersonic inward-turning inlet by applying the traditional basic flowfield, a reflected shock-wave is formed in the isolator due to the continuous reflection of the cowlreflected shock wave in the basic flow-field, which interacts with the boundary layer to produce a considerable influence on the performance of the inlet. Here, a basic flow-field design method that can control the velocity direction at the throat section is developed, and numerical simulations are conducted to demonstrate the effectiveness of this method. The method presented in this paper can achieve the absorption of the reflected waves at the shoulder of the basic flow-field by adjusting the variation law of the center radius in the basic flow-field, and a smooth transition between the compression surface and the isolator can also be produced. The Mach number and total pressure recovery coefficient of the inlet designed according to this method are 3.00 and 0.657, respectively, at design point(the incoming flow Mach number Ma1= 6.0). The results show that with this method, the inlet can efficiently weaken both the reflection of the shock wave and the interaction between the boundary layer and the reflected shock waves, which improves the aerodynamic performance of the inlet.

摘要：Starting from the stage characteristics of children's cognitive development, the types of performance related to cognitive function and the design points involved in outdoor landscape entertainment facilities were sorted out and analyzed, and the design strategies of landscape entertainment facilities based on cognitive function were put forward in this paper, so as to make public toys more appropriate to promote children's all-round development of cognitive ability.

摘要：Cities are co-built spaces by natural environment and human activities, and their formation and development rely on human activities. City spaces, according to Henri Lefebvre, are not only tangible and perceivable, but also heterogeneous, which can be reconstructed. London, as the most ancient city and the political, economic and cultural center of Britain, was depicted in verses of different periods, within which its landscape and city spaces took on different visions and had been endowed with various meanings. The heterogeneous London city spaces reveal historical changes, and, at the same time, reflect how the literary writers understand, perceive and expect from the city. From the Renaissance verses, readers can not only see what the London city was like in realistic writings, but also the imagined spaces based on the reconstructed history, which are the embodiment of the writers’ geopolitical imagination.

摘要：In this paper,a physical base friction test model of a slope is *** model is based on similarity principles and the geological conditions of a complicated bridge slope during construction,deformation and *** behavior of the slope in both its natural state and during excavation loading is qualitatively analyzed through base friction *** base friction test results are then subjected to comparison and analysis using finite element numerical *** findings show that the whole engineered slope tends to stabilize in its natural state,whereas instabilities will arise at faulted rock masses located near bridge piers during excavation ***,to ensure normal construction operation of bridge works,it is suggested that pre-reinforcement of faulted rock masses be performed.

摘要：GPR40 has emerged as an attractive drug target for the treatment of type 2 diabetes due to its role in the enhancement of insulin secretion with glucose dependency. With the aim to improve the metabolic and safety profiles, a series of novel phenylpropionic acid derivatives were synthesized. Extensive structural optimization led to identification of compounds 22 g and 23 e as potent GPR40 agonists with moderate liver microsomal stability. All the discovery supported further exploration surrounding this scaffold.

摘要：侧风作用是影响高速磁浮系统动力设计的重要因素之一。为获得侧风作用下高速磁浮列车-轨道梁耦合振动响应,首先,建立了风-静悬磁浮列车-轨道梁(WSMG)和风-移动磁浮列车-轨道梁(WMMG)空间耦合分析模型。然后,通过风洞试验对磁浮车辆的气动特性进行测试。磁浮列车的控制系统采用比例-积分-微分(PID)控制器和加速度反馈相结合的比例-积分-微分-加速度(PIDA)控制算法进行调控。最后,分析了平均风、脉动风、风速和车速对磁浮系统动力响应的影响。结果表明:PIDA控制算法可以消除侧风引起的磁浮间隙稳态误差,并减小大约40%的车体横向位移;均匀风只改变列车的平衡位置,脉动风和轨道不平整是引起磁浮列车-轨道系统振动的主要原因;风速对车辆的横向振动的影响更为敏感,当风速超过30 m/s时,高速磁浮列车应停止运行。

摘要：TiO2 pigments are typically coated with inert layers to suppress the photocatalytic activity and improve the weatherability. However, the traditional inert layers have a lower refractive index compared to TiO2, and therefore reduce the lightening power of TiO2. In the present work, a uniform, amorphous, 2.9-nm-thick TiO2 protective layer was deposited onto the surface of anatase TiO2 pigments according to pulsed chemical vapor deposition at room temperature, with Ti Cl4 as titanium precursor. Amorphous TiO2 coating layers exhibited poor photocatalytic activity, leading to a boosted weatherability. Similarly, this coating method is also effective for TiO2 coating with amorphous SiO2 and SnO2 layers. However, the lightening power of amorphous TiO2 layer is higher than those of amorphous SiO2 and SnO2 layers. According to the measurements of photoluminescence lifetime, surface photocurrent density, charge-transfer resistance, and electron spin resonance spectroscopy, it is revealed that the amorphous layer can prevent the migration of photogenerated electrons and holes onto the surface, decreasing the densities of surface electron and hole, and thereby suppress the photocatalytic activity.

摘要：开发高性能、稳定的双功能电催化剂是一个具有挑战性的课题.本工作基于界面工程和空位工程,通过电沉积成功构建了一种富含氧空位的异质结催化剂.所制备的催化剂V_(O)-Co(OH)_(2)/CoN在碱性电解质中具有良好的双功能催化活性和稳定性,在10 mA cm^(-2)条件下,析氢反应的过电位为52 mV,析氧反应的过电位为206 mV,且其全水分解电压仅为1.518 V.更重要的是,实验和密度泛函理论计算都证实了V_(O)-Co(OH)_(2)/CoN优异的双功能活性归因于异质界面和氧空位的协同催化.在异质界面附近,一个Co原子和一个氧空位共同形成一个活性Co空位对,通过改变反应路径协同促进水分解.氧空位不仅作为活性位点直接参与催化过程,还能有效调节电子密度,提高催化剂的导电性.本工作对于指导高性能催化剂的设计和深入了解催化机理具有重要意义.

摘要：Physical model test is an effective way to unveil the dynamic response of a slope under seismic *** similarity design is the key of physical model *** isolated similarity design method for shaking table tests was proposed and verified in this *** this method,the relevant physical quantities were divided into several subsystems and subcharacteristic equations for each subsystem were then established based on the Buckingham similarity ***-scale shaking table tests on a reinforced slope were adopted herein to illustrate the application of the proposed isolated similarity design *** similarity system for the studied slope was divided into four parts in the process of similarity *** geometrical dimension L,densityρand gravity g were selected as fundamental quantities for the similarity design,and four subcharacteristic equations were established for each *** dynamic responses of the recorded acceleration and axis force show that the seismic waves propagate well in the model *** proposed isolated similarity design method solves the conflict between the similarity requirement for all relevant physical quantities and the difficulty of test model fabrication to satisfy all similarity relations.