摘要：This paper aims at probing the flow characteristics of a jet in supersonic crossflow(JISC)by installing a vortex generator(VG)upstream of the jet *** planar laser scattering(NPLS)and stereo-particle image velocimetry(SPIV)technologies were employed to observe the flowfield,and three cases were designed for ***0 stands for JISC without passive *** CASE1 and CASE2,VG is installed at 20 mm and 80 mm upstream away from the jet orifice,*** flow structures show that two flow modes exist when the VG wake interacts with the *** CASE1,vortices are induced from both sides of the jet plume because of the VG *** leads to a complex streamwise vortex *** and lateral diffusion are *** CASE2,intermittent large-scale eddies in the VG wake cause large streamwise vortices at the windward side of the *** penetration depth is also enhanced while the lateral diffusion is *** addition,experimental results show that the penetration depth is approximately 8.5%higher in CASE1 than that in CASE0,and the lateral diffusion is larger by about 17.0%.In CASE2,the penetration is increased by about 26.2%,while the lateral diffusion is enhanced by just 0.5%.

摘要：Based on the height of back-filled materials, thickness of ore body, height of boundary pillar and dipping angle of ore body and water pressure, the safety factors of all the pillars are calculated with the limit equilibrium method. The calculation results present that the safety factors of pillars in Sections 19, 20, 24, 28 are less than 1.3, and those of unstable sections are identified preliminarily. Further, a numerical investigation in Sections 18, 20, 22, 24, 25 and 28 implemented with numerical code RFPA20 is employed to further validate the pillar performance and the stability of stopes. The numerical results show the pillars in Sections 18, 22 and 24 are stable and the designed pillar size is suitable. The width of the ore body near Section 28 averages 20 m, failure occurs in the left stope, but the boundary pillars near Section 28 maintain good performance. The pillars in Sections 20 and 25 are unstable which are mainly affected by the Faults F8 and F18. The existence of faults alters the stress distribution, failure mode and water inrush pathway. This work provides a meaningful standard for boundary pillar and stope design in a mine as it transitions from an open pit to underground.

摘要：For the issue of nuclear radiation detection,this paper designs a remote control nuclear radiation detector which can trace a pre-determined route,avoid obstacles effectively,and can be controlled remotely by users wirelessly or through voice *** can effectively replace manual probing due to convenience,flexibility and *** system mainly consists of a nuclear detection module,a voice control module,a route tracing module,an obstacle avoidance module,a data transmission module,storage and a display module,and a *** MSP430 microcontroller is used as a control chip to control the motor and the system uses infrared technology and ultrasonic sensors to achieve intelligent tracing and obstacle ***,it applies a voice module and data transmission module to remotely controlling the *** radiation data is shown on an LCD screen.

摘要：烧绿石基陶瓷材料是理想的核废物固化基材,本研究采用燃烧反应结合快速加压工艺,以Cu O为氧化剂、Ti为还原剂,在5 min内快速制备出烧绿石基Y2-xGdxTi2O7/Cu复合材料固化体。以Gd作为三价锕系核素的模拟物,设计Gd取代Y2-xGdxTi2O7烧绿石中的Y位。结果表明,Gd能完全取代Y位形成Gd2Ti2O7烧绿石,所得产物没有杂质相出现,且在烧绿石基体中没有出现相分离现象。选择Gd1.0样品进行浸出试验,结果表明该样品具有优异的水热稳定性,Cu、Y和Gd元素的42d归一化浸出率分别低至2.4×10^-2、1.1×10^-5和5.3×10^-6 g·(m2·d)-1。

摘要：p-type技术能够简化低温多晶硅TFT的制作过程。基于这个原因,本文提出了一种改进的利用p-type多晶硅TFT构成的移位寄存器结构,它可以作为AMOLED或者AMLCD外围驱动电路的一部分被集成到显示屏的衬底上。改进的移位寄存器由6个时钟控制,每个单元包含6个p-type多晶硅TFT。本文利用HSPICE进行仿真,验证了电路功能的正确性。利用韩方在多晶硅制作方面的优势,已经利用以上技术完成了96×3×128的AMOLED显示屏的制作。

摘要：The detent force of a permanent magnet linear synchronous motor （PMLSM） is analyzed and the corresponding optimization methods are presented to reduce it. The detent force, which is divided into two components, i.e. resulting from the end effect and resulting from the slotting effect, can be analyzed respectively by the finite element method （FEM）. To reduce the detent force arising from the end effect, several optimal design techniques are utilized, namely, adopting the suitable length and end shape of the primary armature. The detent force resulting from the slotting effect is reduced by means of skewing and adjusting the width of the magnets mounted on the secondary armature, and adopting the fractional slots of the primary armature. The validity of the analytical detent force predictions and the effectiveness of the detent force reduction techniques are verified by the experimental measurements.

摘要：Radon is a polluting and radioactive gas released by rock fracture. Shear fracture is widely developed in surrounding rock mass of deep engineering. Nevertheless, the correlation between radon release and the shear fracture is undefined. In this study, the intact Jinping marble and Baihetan basalt were adopted as samples. Based on radionuclide content analysis, the intrinsic characteristics of radon emission were analyzed. Then a direct shear testing system was designed to synchronously measure radon release during rock fracture. The direct shear tests were carried out under different normal stresses. The relationship between shear fracture process and cumulative radon concentration was explored. The results indicated that radon release varied with the increase of shear displacement under the same normal stress. The general pattern showed a slight increase and fell in the initial loading phase, then increased rapidly to the peak release approximately corresponding to the peak of shear stress, and finally decreased to a stable level with the development of shear displacement after sample failure. The initial and peak radon concentrations increased linearly with the increase of normal stress. The same trend was found in shear failure surface area and cumulative radon concentration according to the rise angle(RA) value-average frequency(AF) distribution.

摘要：多硫离子穿梭和锂枝晶生长严重阻碍了锂硫电池的实际应用进程,而合理的隔膜结构可以达到一石二鸟的作用.本工作设计了一种携带有分散性TiN/CoO颗粒的氮掺杂碳纳米管结构(TCCNT),并将其用于锂硫电池隔膜修饰层.TCCNT的多孔结构和表面/内部携带的TiN/CoO颗粒不但实现了对多硫化物的物理、化学吸附和快速催化转化作用,其高导电性的空腔结构和亲锂作用还能够均化锂离子流,在5 mA cm^(-2)的电流密度下实现长达2000 h的均匀锂沉积/剥离过程.TCCNT合理的结构设计有利于各材料组分之间最大限度地发挥协同效应.采用改性隔膜所组装的锂硫电池在常规和高硫载量两种情况下均表现出较好的电化学性能,表明其具有一定的实际应用潜力.

摘要：The isothermal sections of Al-Fe-Sn ternary system at 973 and 593 K were determined experimentally by the equilibriated alloy method using scanning electron microscopy coupled with energy-dispersive spectrometry and X-ray diffractometry. Experimental results show that no ternary compound is found on these two sections. The maximum solubility of Fe in the liquid phase is 1.6%（mole fraction） at 973 K and those of Fe and Al in the liquid phase are 0.6% and 5.1%（mole fraction） at 593 K, respectively. The maximum solubility of Sn in the Fe-Al compounds is 4.2%（mole fraction） at 973 K and 2.3%（mole fraction） at 593 K. All the Fe-Al compounds can be in equilibrium with the liquid phase.

摘要：Multifunctional catalysts that integrate high efficiency hydrogen evolution reaction(HER), oxygen evolution reaction(OER) and oxygen reduction reaction(ORR) catalytic activity in a single material are attractive for unitized regenerative fuel cells and overall water splitting technologies. As the best-known HER and ORR electrocatalysts, Pt and its alloys have only moderate OER activity. Ruthenium and iridium oxides exhibit the highest OER activities but not as active as Pt for HER and ORR. Here, we proposed a general principle for achieving trifunctional electrocatalysis for three reactions in a single material. Using the newly-synthesized pyrazine-modified graphdiyne(PR-GDY) as an example, we demonstrated that the synergistic effect of the pyridinic nitrogen and anchored transition-metal(TM) single atoms renders highly-efficient HER/OER/ORR trifunctional electrocatalytic activity. For the Ni-doped PR-GDY, the overpotentials for HER, OER and ORR can be respectively as low as -0.05, 0.29 and 0.38 V, which are comparable or even superior to the best-known single-functional and bi-functional precious *** computational results offer not only a promising trifunctional electrocatalyst but also a strategy for the design of multifunctional electrocatalysts.