Momentum-Space Topology of Standard Model

The momentum-space topological invariants, which characterize the ground state of the Standard Model, are continuous functions of two parameters, generated by the hypercharge and by the weak charge. These invariants provide the absence of the mass of the elementary fermionic particles in the symmetric phase above the electroweak transition (the mass protection). All the invariants become zero in the broken symmetry phase, as a result all the elementary fermions become massive. Relation of the momentum-Space invariants to chiral anomaly is also discussed.     

Simulation Model of a Carrier Standard

A model is described for simulating the functioning process of a carrier standard in a system for transferring the sizes of units of physical quantities. The model is intended for obtaining values of a probability series characterizing the carrier standard being located at different stages of a standard functioning cycle.     

标准样件的计量确认方法

标准样件在科研生产过程中用于量值传递,它的性能直接关系着产品的质量。本文结合我院标准样件的具体情况,提出了标准样件计量确认方法,给出了详细的测试实施步骤,总结出了标准样件计量确认的注意事项,通过这项工作使标准样件的计量进一步规范化。     

The Standard Model and the neutron β-decay

This article reviews the relationship between the observables in neutron β-decay and the accepted modern theory of particle physics known as the Standard Model. Recent neutron-decay measurements of various mixed American–British–French–German–Russian collaborations try to shed light on the following topics: the coupling strength of charged weak currents, the universality of the electroweak interaction and the origin of parity violation.     

标准驱动产业升级的理论与模式研究

产业升级是个永恒的主题,是科技发展和社会进步的必然要求,也是应对当前国际金融危机的有效手段。在知识经济和经济全球化时代,标准,尤其是技术标准已经成为引领产业升级的一种新模式。通常情况下,尚未形成标准的技术创新,影响的只是一个或若干个企业,而标准影响的则是一个产业,甚至是一个国家的竞争力。本文从标准、产业链和产业升级概念阐明出发,在分析标准对社会、经济和产业发展作用基础上,提出标准驱动产业升级的三大模式,即上游产业的引领带动型——拉动模式、中游产业的主导提升型——驱动模式、下游产业的推动促进型——推动模式,最后对标准驱动产业升级的理论进行思考,认为应从产业链的整体角度考虑标准驱动产业升级以及辩证看待标准在产业升级中的作用。     

Outstanding questions: physics beyond the Standard Model

The Standard Model of particle physics agrees very well with experiment, but many important questions remain unanswered, among them are the following. What is the origin of particle masses and are they due to a Higgs boson? How does one understand the number of species of matter particles and how do they mix? What is the origin of the difference between matter and antimatter, and is it related to the origin of the matter in the Universe? What is the nature of the astrophysical dark matter? How does one unify the fundamental interactions? How does one quantize gravity? In this article, I introduce these questions and discuss how they may be addressed by experiments at the Large Hadron Collider, with particular attention to the search for the Higgs boson and supersymmetry.     

Physics Beyond the Standard Model with Trapped Cold Atoms

The motivation to study physics beyond the Standard Model of weak interactions is presented and ways to carry out such studies using cold atoms are described. Measurements leading to searches for non-Standard Model scalar and tensor interactions, searches for right-handed neutrinos and for time-reversal violations are described. The searches are done using precision measurements of β decay of cold trapped radioactive atoms and cold neutrons.     

航空模型联盟标准促进产业技术标准升级

珠海是航空模型器材产业航模制造较集中的城市,但由于技术标准缺乏,发展受到限制。珠海市航空模型联盟标准的制定,将促进产业技术标准升级,带动航模器材产业集群的发展。     

Provably Secure APK Redevelopment Authorization Scheme in the Standard Model

The secure issues of APK are very important in Android applications. In order to solve potential secure problems and copyrights issues in redevelopment of APK files, in this paper we propose a new APK redevelopment mechanism (APK-SAN). By exploring sanitizable signature technology, APK-SAN allows the original developer to authorize specified modifier who can redevelop the designated source code of APK files. Our scheme does not require interactions between the developer and modifiers. It can reduce the communication overhead and computational overhead for developers. Especially, the signature of redeveloped APK files is valid and maintains the copyrights. The proposed APK-SAN signature can effectively protect the security of the redeveloped APK files and copyrights of the developer and modifier.     

化工品实验室参考标准和标准物质的类别及控制要点

本文阐述了化工品实验室参考标准和标准物质的类别及其验证、制备、储存、期间核查、有效期等方面的控制要点.     

关于计量标准考核

本文介绍了计理标准考核的主要内容和必要性以及撰写《建标报告》的意义。     

标准恒温槽的应用与研究

标准恒温槽是用于-100～300℃范围温度标准配套设备.广泛应用于法定计量机构、电力、石化、航空航天、铁路、机械制造等领域的温度计量.近年来恒温槽产品的结构和性能都有了非常大的变化,无论是安全性能还是计量特性都有了明显的提高.对标准恒温槽产品的结构、加热器、导热介质和温场性能等进行了介绍和分析.     

Standard Model Treatment of the Radiative Corrections to Neutron β-Decay

Starting with the Standard Model electroweak Lagrangian, the radiative corrections to neutron β-decay are obtained. Nucleon compositeness is considered by appropriate parameterization of the nucleon weak transition current and electromagnetic form factors.     

Mathematical Model of a Territorially Distributed Collective Time and Frequency Standard

A method for combining remote atomic clocks into one collective network is described. A synthesized model gives the uncertainty of the collective standard as a function of the frequency instability versus the number of clocks in the network and the measuring time. The results of an investigation of that model are reported.     

基于复合混沌模型的高级加密标准图像加密算法

为提高图像加密算法的安全性能,提出了一种基于复合混沌系统的改进的高级加密标准加密算法。该算法将Logistic混沌序列与Chebyshev混沌序列相结合,产生2种新的混沌映射。一种复合混沌矩阵作为高级加密标准的轮密匙,进行像素置乱;另一种复合混沌矩阵组成S盒,进行位置置乱。另外,对图像像素点进行位移及列混合操作,进一步达到位置置乱的目的,实现动态变换密钥的高级加密标准图像的加密。实验结果表明,该算法具有较高的密钥敏感性、良好的置乱效果及高效性。     

标准气体配制装置

对采用重量法配制特气的装置进行了阐述,对装置中各部件的选择、操作过程中应注意的问题提出了一些见解。     

一种新型DC100A电流源标准的设计

介绍了一种利用最新研发的电子元件和电流检测技术设计的DC 100A直流电流标准装置.该标准采用"ZERO-FLUK"技术解决了电流采样单元的零温漂、零功耗问题;采用高分辨力数模转换控制电路解决了系统控制精度和稳定性的问题.     

产品质量标准数据清洗模型及应用研究

本文针对当前国内外对产品质量标准数据清洗问题研究的局限,基于人工智能学科中的BP人工神经网络理论,用L-M算法改进的BP人工神经网络构建了产品质量标准数据清洗模型,并以洗衣机产品质量标准数据为实例,用所设计模型进行了产品质量标准数据清洗实验验证。经实验验证发现,本研究给出的模型是一种具有普适意义、符合科学理论、合理的产品质量标准数据清洗模型,支持绝大部分产品质量标准数据清洗,既丰富了产品质量标准数据清洗理论,又能应用于经济社会发展实践。模型支持产品质量标准数据自动化、智能化、高速度清洗,为国家质量基础设施(NQI)共性技术的研究提供了重要的方法论。