In Situ Artificial Hybrid SEI Layer Enabled High-Performance Prelithiated SiOx Anode for Lithium-Ion Batteries

Considered the promising anode material for next-generation high-energy lithium-ion batteries, SiO_x has been slow to commercialize due to its low initial Coulombic efficiency (ICE) and unstable solid electrolyte interface (SEI) layer, which leads to reduced full-cell energy density, short cycling lives, and poor rate performance. Herein, a novel strategy is proposed to in situ construct an artificial hybrid SEI layer consisting of LiF and Li₃Sb on a prelithiated SiO_x anode via spontaneous chemical reaction with SbF₃. In addition to the increasing ICE (94.5%), the preformed artificial SEI layer with long-term cycle stability and enhanced Li⁺ transport capability enables a remarkable improvement in capacity retention and rate capability for modified SiO_x. Furthermore, the full cell using Li(Ni_0.8Co_0.1Mn_0.1)O₂ and a pre-treated anode exhibits high ICE (86.0%) and capacity retention (86.6%) after 100 cycles at 0.5 C. This study provides a fresh insight into how to obtain stable interface on a prelithiated SiO_x anode for high energy and long lifespan lithium-ion batteries.     

Validating and Scaling the MicroGrid: A Scientific Instrument for Grid Dynamics

Large-scale Grids that aggregate and share resources over wide-area networks present major challenges in understanding dynamic application and resource behavior for performance, stability, and reliability. Accurate study of the dynamic behavior of applications, middleware, resources, and networks depends on coordinated and accurate modeling of all four of these elements simultaneously. We have designed and implemented a tool called the MicroGrid which enables accurate and comprehensive study of the dynamic interaction of applications, middleware, resource, and networks. The MicroGrid creates a virtual Grid environment – accurately modeling networks, resources, the information services (resource and network metadata) transparently. Thus, the MicroGrid enables users, Grid researchers, or Grid operators to study arbitrary collections of resources and networks. The MicroGrid includes the MaSSF online network simulator which provides packet-level accurate, but scalable network modeling. We present experimental results with applications which validate the implementation of the MicroGrid, showing that it not only runs real Grid applications and middleware, but that it accurately models both their and underlying resource and network behavior. We also study a range of techniques for scaling a critical part of the online network simulator to the simulation of large networks. These techniques employ a sophisticated graph partitioner, and a range of edge and node weighting schemes exploiting a range of static network and dynamic application information. The best of these, profile-driven placement, scales well to online simulation of large networks of 6,000 nodes using 24 simulation engine nodes.     

洪水期水库调水调沙与黄河下游河道排沙分析

从1973～1990年期间，选取了60个洪峰时段的实测资料，分析了黄河下游河道的泥沙淤积和排沙比，得出结论为，如果洪水期三门峡出库平均含沙量为100～200kg／m3时，出库洪峰流量在4000～5000m3／s之间，可把50％～80％左右0．025～0．05mm和0．05～0．1mm的两级中粗沙排入海里；洪水期出库平均含沙量为50～100kg／m3，出库洪峰流量为3500～4000m3／s左右时，可把50％～190％的0．025～0．05mm和0．05～0．1mm的两级中粗沙排入海里．     

新型高亮度、高分辨率双束电子光学系统

由三基色显示管投影来实现大屏幕显示仍是首选方案 ,为了提高投影质量 ,缓解亮度与分辨率间的矛盾 ,采取了三项主要措施 :1、采用双束扫描荧光屏 ;2、在发射系统采用层流枪的优点 ;3、采用电阻螺旋线形成的多极透镜与外磁透镜相配合作为主聚焦结构     

高对比度滤光片的研制

本文介绍自行研制的高对比度滤光片。它具有较低的表面光反射率、选择性透过率和电磁屏蔽特性。     

激光显像管的初步研究

用高能电子束作泵浦源 ,去激励半导体晶体屏 ,可以产生激光 ,实现高亮度高清晰显示     

Grain Refinement of Aluminium by Master Alloy AlTi6C1

For the grain refinement of super pure aluminium and commercial pure aluminium,Al-Ti-C master al-loy is better than Al-Ti alloy.It was shown by scanning electron microscope(SEM)and electron-probe mi-croanalyser(EPMA)that when the amount of titanium added is less than 0.15%,grain refinement of superpure aluminium is due to TiC particles rather than peritectic reaction.In addition,the presence of impurityelements in commercial pure aluminium plays an important role in grain refinement.The process of grain re-finement of aluminium by TiC is discussed in light of the TiC thesis.     

Sintering behaviour of hydroxyapatite reinforced with 20 wt % Al2O3

Hydroxyapatite reinforced with 20 wt% Al₂O₃ was sintered at 1200, 1300 and 1400°C. The sintering behaviour was investigated using X-ray diffraction and electron microscopy. Calcium aluminate phases were observed to be produced by the solid-state reaction between Al₂O₃ and hydroxyapatite. As a hard phase these phases influence the densification of hydroxyapatite with 20 wt% Al₂O₃ due to different sintering rates between the matrix and calcium aluminate.