Facial expression analysis and expression-invariant face recognition by manifold-based synthesis

Over the last decades, expression classification and face recognition have received substantial attention in computer vision and pattern recognition with more recent efforts focusing on understanding and modelling expression variations. In this paper, we present an expression classification and expression-invariant face recognition method by synthesising photorealistic expression manifolds to expand the gallery set. By means of synthesising expression images from neutral faces, more within-subject variability can be obtained. Eigentransformation is utilised to generate both shape and expression details for novel subjects. Expression classification and face recognition are then performed on the extended training set with synthesised expressions. Experimental results on various datasets show that the proposed method is robust for recognising various expressions and faces with varying degrees of expression. Comprehensive experiments conducted and comparisons with the existing methods are reported. Cross-database synthesis and effect of landmark quality are also studied.     

NASICON-structured Na_(3.1)Zr_(1.95)Mg_(0.05)Si_2PO_(12) solid electrolyte for solid-state sodium batteries

Using stable inorganic solid electrolyte to replace organic liquid electrolyte could significantly reduce potential safety risks of rechargeable batteries. Na-superionic conductor(NASICON)-structured solid electrolyte is one of the most promising sodium solid electrolytes and can be employed in solid-state sodium batteries. In this work, a NASICONstructured solid electrolyte Na_(3.1)Zr_(1.95)Mg_(0.05)Si_2PO_(12) was synthesized through a facile solid-state reaction, yielding high sodium-ionic conductivity of 1.33×10~(-3) S·cm~(-1) at room temperature. The results indicate that Mg~(2+)is a suitable and economical substitution ion to replace Zr~(4+), and this synthesis route can be scaled up for powder preparation with low cost. In addition to electrolyte material preparation, solid-state batteries with Na_(3.1)Zr_(1.95)Mg_(0.05)Si_2PO_(12) as electrolyte were assembled. A specific capacity of 57.9 mAh·g~(-1) is maintained after 100 cycles under a current density of 0.5 C rate at room temperature. The favorable cycling performance of the solid-state battery suggests that Na_(3.1)Zr_(1.95)Mg_(0.05)Si_2PO_(12) is an ideal electrolyte candidate for solid-state sodium batteries.     

脉冲辐解研究 DNA 羟基加成自由基快速修复过程

脉冲辐解研究ＤＮＡ羟基加成自由基快速修复过程⒇姜岳姚思德林念芸（中国科学院辐射化学开放研究实验室中国科学院上海原子核研究所上海２０１８００）氧自由基由于具有极其活泼的化学活性和致癌、致心血管疾病、感染及促进衰老等作用而引起人们的广泛关注。而羟自由基氧...     

RCS－Ⅰ反应堆堆芯模拟程序

本文介绍堆芯三维物理—热工水力耦台计算程序ＲＣＳ－Ｉ（ＲｅａｃｔｏｒＣｏｒｅＳｉｍｕｌａｔｏｒ）．其中子学模型采用先进的粗网格节块格林函数法，热工水力计算模型采用于通道分析方法．通过考虑多种反馈，该程序比较真实地描述堆芯的燃耗过程，具有临界、燃耗、中毒、跟踪和倒料等多种功能，可用于动力堆和研究堆的设计．     

用灵敏值确定纯β核素的液闪测量效率

纯β核素液闪测量技术应用广泛,实际工作中往往需要确定核素的测量效率;但除~3H、~(14)C等半衰期较长的核素外,多无系列猝灭标准源,给工作带来很多不便。本文根据国外有关方面研究,做了以~3H标准源为基准、通过理论计算求出其它纯β核素在均相条件下的测量效率和猝灭校正曲线,进而求得放射性的活度。本方法使用简便、结果可靠,实用性强。     

飞机撞击下高温气冷堆乏燃料厂房损伤研究

本文针对典型高温气冷堆乏燃料厂房在双发商用飞机撞击载荷下的响应及结构完整性开展研究,并探讨结构特性对撞击损伤的影响。对乏燃料厂房及飞机分别建立有限元模型,通过弹体-目标相互作用分析模拟了飞机撞击过程,综合IAEA与NRC的评价准则对乏燃料厂房在飞机撞击下的损伤程度进行评估。数值结果表明：厂房上对应于机身及发动机的撞击位置发生可接受的局部损伤;乏燃料贮存井墙体对于提高构筑物抗飞机撞击能力有重要作用。此外,构筑物外形对损伤有很大影响,圆柱形壳体的抗飞机撞击能力显著强于方形厂房,是核电厂厂房设计的优化方向之一。     

Cu(II)-Catalyzed Ortho-Selective Amination of Simple Phenols with O-Benzoylhydroxylamines

A Cu(II)-catalyzed ortho-selective amination of simple phenols with O-benzoylhydroxylamines has been developed, which provides access to 2-aminophenols under mild conditions. Various functional groups on the phenol and electrophilic amine are compatible, and the protocol typically delivers the products in moderate to good yields. The mechanistic detail of this process are discussed.     

Recycling of Polyethylene Bags into High-Strength Yarns Without Using Melt Processing

A critical issue facing mankind is how to effectively recycle plastic grocery bags. Currently, the most proven practice for bag recycling is to create numerous returning sites throughout the nation. However, the success is compromised by the voluntary nature of such activities. In this work, we investigate an alternative approach to bag returning, by diverting recycling activities directly to consumers or end users at home. Specifically, a simple process for converting waste bags into high-strength fibers and yarns is designed and tested in an experimental feasibility study. The results from tensile testing and thermal analysis demonstrate that by a combined process sequence of cutting, knotting, twisting, hot drawing, and heat setting, high-strength polyethylene yarns with mechanical properties comparable to those of melt-spun polyethylene fibers can be produced. Without the involvement of melt processing, yarns made of a waste high-density polyethylene grocery bag material were hot drawn and heat set to achieve a tensile strength of 330 MPa. Yarns with such ternacity are expected to find numerous applications in textile, flooring, and leisure products. This may open up a new paradigm in plastic bags recycling and allow part of the recycling burden to be shifted to local residential communities. POLYM. ENG. SCI., 60: 281–287, 2019. © 2019 Society of Plastics Engineers