小议自动衡器在能源计量中的作用

“自动衡器”概念,在称量过程中不需要操作者干预,按照预定的处理程序自动工作的衡器。自动衡器是衡器产品中的一个重要组成部分,由于其有称量速度快、自动化程度高等优势,被广泛应用于大宗物料交接等称重计量。我国能源消耗是煤碳,特别是火力发电、钢铁、有色金属、建材、石油加工、化工等高耗能行业,煤炭基本上是这些行业能源消耗的唯一选择。煤炭贸易计量的主要手段就是电子皮带秤,它是自动衡器的一种,而电子皮带秤的准确度高低是耗能行业节能减排的关键。因此,需要加强自动衡器在能源计量中的作用。

电能自动抄表系统在电力营销计量中的作用探析

随着社会的进步与发展,人们的生活质量日益提高,再加上科技也在不断进步,人们对电量的需求越来越大,所以电能自动抄 表系统随之得到了广泛的使用,电力营销使用信息化之后得到了很大程度的提高。在电力营销中传统的抄表系统非常复杂,为了解决存在 的问题,研发出了电能自动抄表系统,电能自动抄表系统使用方便,其功能符合现代社会的发展需求,会在一定程度上保证电网企业的可 持续发展,本文主要研究电能自动抄表系统在电力营销计量中的作用。

计量——质量提升的技术基础

目的:论述计量在推动社会经济高质量发展中的作用.方法:从计量定义、计量体系和计量作用三方面阐述计量在质量提升及国家质量基础设施建设中的基础作用与核心地位.结果:世界各国高度重视计量发展,日益完善计量体系,赋予计量新的使命和内涵.计量作为国家发展质量的战略基础,是科技进步、社会发展和国防安全的重要技术支撑,已成为国家核心竞争力的重要标志.结论:计量、标准和合格评定共同构成国家质量技术基础,是经济可持续发展的三大支柱,其中计量是标准、合格评定的基础,是质量提升的技术基础,是推动高质量发展的核心要素.

名量词在“一+X+N”结构中的两个作用

“数+量+名”是现代汉语的常用结构。当数词为“一”时,出现在“名量词”位置上的可以是一些“名词/动词/形容词”,构成“一+X+N”结构。这三类词以不同方式、在不同程度上扩大了“名量词”语法位的职能:X不仅能发挥计量作用,还能描摹出N所代表的事物的形象和色彩。

高度重视新发展格局下外需和外循环的作用

正确认识外需和外循环对经济增长的作用,是贯彻落实党中央为加快构建以国内大循环为主体、国内国际双循环相互促进的新发展格局所作战略部署的重要前提。然而,按照传统支出法测算,外需对经济增长的贡献明显偏低,这严重背离经济现实,容易造成忽视外需的误导。为此,必须科学构建衡量外需和外循环作用的计量方法和评价体系,理性看待和高度重视我国新发展格局下外需和外循环作用,在此基础上,坚持以国内大循环为主体,坚持全面扩大对外开放、全方位参与和促进国际循环,形成国内国际双循环相互促进的良性局面。

基于微课的计量经济学课程设计与教学改革研究

本文在对计量经济学内容模块及课程体系进行梳理的基础上,基于新兴的教学方式——微课,以经典计量经济学中单方程模型最小二乘估计量的最优线性无偏性质为例,进行了具体的微课教学设计,并且在微课设计的过程中,融入了"互联网+"的思想。在此基础上,本文还对传统的计量经济学教学方式和教学方法进行了反思,认为传统教学过程中存在着理论与应用脱节、学生理解效果较差等一系列问题,而基于微课的计量经济学教学设计可以在教学安排、教学方式等多个方面弥补传统教学方式的缺陷,在一定程度上提高学生的学习效果。

关于医学计量工作重要性的思考

大家知道,医学计量关系到人身的健康与生命安全,关系到医疗技术进步,关系到医疗卫生实业的健康发展,无论在全球经济的发展中,还是在我国法制计量的工作中,医学计量发挥着及其重要的作用。本文通详细阐述医学计量的重要性与计量检定工作的意义,希望通过本文论述使读者对医学计量工作的重要性有所认知。

Circular Rydberg States of Atomic Hydrogen in an Arbitrary Magnetic Field

We report a theoretical scheme using a B-spline basis set to improve the poor computational accuracy of circular Rydberg states of hydrogen atoms in the intermediate magnetic field. This scheme can produce high accuracy energy levels and valid for an arbitrary magnetic field. Energy levels of hydrogen are presented for circular Rydberg states with azimuthal quantum numbers ｜m｜ =10-70 as a function of magnetic field strengths ranging from zero to 2.35 × 10^9 T. The variation of spatial distributions of electron probability densities with magnetic field strengths is discussed and competition between Coulomb and magnetic interactions is illustrated.

A Multiple Functional Protein:the Herpes Simplex Virus Type 1 Tegument Protein VP22

The herpes simplex virus type 1 （HSV-1） VP22, is one of the most abundant HSV-I tegument proteins with an average stoichiometry of 2 400 copies per virion and conserved among alphaherpesvirinae. Many functions are attributed to VP22, including nuclear localization, chromatin binding, microtubule binding, induction ofmicrotubule reorganization, intercellular transport, interaction with cellular proteins, such as template activating VP16, pU factor I （TAF-I） and nonmuscle myosin II A （NMIIA）, and viral proteins including pUS9 and pUL46, glycoprotein E （gE） and gD. Recently, many novel functions perform tegument protein ed by the HSV-1 VP22 protein have been shown, including promotion of protein synthesis at late times in infection, accumulation of a subset of viral mRNAs at early times in infection and possible transcriptional regulation function .

First and Others credit-assignment schema for evaluating the academic contribution of coauthors

Credit-assignment schemas are widely applied by providing fixed or flexible credit distribution formulas to evaluate the contributions of coauthors of a scientific publication. In this paper, we propose an approach named First and Others （F＆O） counting. By introducing a tuning parameter a and a weight β, two new properties are obtained： （1） flexible assignment of credits by modifying the formula （with the change of a） and applying preference to the individual author by adjusting the weights （with the change ofβ）, and （2） calculation of the credits by separating the formula for the first author from others. With formula separation, the credit of the second author shows an inflection point according to the change ofa. The developed theorems and proofs concerning the modification of a and fl reveal new properties and complement the base theory for informetrics. The F＆O schema is also adapted when considering the policy of＇first-corresponding-author-emphasis＇. Through a comparative analysis using a set of empirical data from the fields of chemistry, medicine, psychology, and the Harvard survey data, the performance of the F＆O approach is compared with those of other methods to demonstrate its benefits by the criteria of lack of fit and coefficient of determination.

Study on the Mechanism of Compound Mistletoe Fluidextract in Relieving Hypertension

To observe the effect of Fufang Jisheng Liujin Gao （复方寄生流浸膏 Compound Mistletoe Fluidextract） on blood pressure in the spontaneous hypertensive rats （SHR） and the renal hypertensive dogs （RHD）. Methods： The blood pressure-decreasing effects of single administration and 14-day consecutive administration of Compound Mistletoe Fluidextract （CMF） in SHR and RHD were investigated and compared with that of Niuhuang Jiangya Wan （牛黄降压丸 Bezoar Hypertension-relieving Pills）. Results： Both single administration and 14-day consecutive administration of CMF had significant hypotensive effects in SHR and RHD. Conclusion： The hypotensive action of CMF is gradual, but lasts for a longer period, with a dose-effect relationship in a range of doses.

Experimental demonstration of nonlinear quantum metrology with optimal quantum state

Nonlinear quantum metrology may exhibit better precision scalings. For example, the uncertainty of an estimated phase may scale as △φ∝ 1/N2 under quadratic phase accumulation, which is 1/N times smal-ler than the linear counterpart, where N is probe number. Here, we experimentally demonstrate the non-linear quantum metrology by using a spin-I（I 〉 1/2） nuclear magnetic resonance （NMR） ensemble that can be mapped into a system ofN = 2I spin-1/2 particles and the quadratic interaction can be utilized for the quadratic phase accumulation. Our experimental results show that the phase uncertainty can scale as △φ∝1/（N2-1） by optimizing the input states, when N is an odd number. In addition, the interferomet-tic measurement with quadratic interaction provides a new way for estimating the quadrupolar coupling strength in an NMR system. Our system may be further extended to exotic nonlinear quantum metrology with higher order many-body interactions.

Computational studies of the structure and cation-anion interactions in 1-ethyl-3-methylimidazolium lactate ionic liquid

Quantum chemical calculations of the structures and cation-anion interaction of 1-ethyl-3-methylimidazolium lactate ([Emim][LAC]) ion pair at the B3LYP/6-31++G** theoretical level were performed. The relevant geometrical characteristics, energy properties, intermolecular H-bonds (H-bonds), and calculated IR vibrations with respect to isolated ions were systematically discussed. The natural bond orbital (NBO) and atoms in molecule (AIM) analyses were also employed to understand the nature of the interactions between cation and anion. The five most stable geometries were verified by analyzing the relative energies and interaction energies. It was found that the most of the C-H···O intermolecular H-bonds interactions in five stable conformers have some covalent character in nature. The elongation and red shift in IR spectrum of C-H bonds which involve in H-bonds is proved by electron transfers from the lone pairs of the carbonyl O atom of [LAC] to the C-H antibonding orbital of the [Emim]+. The interaction modes are more favorable when the carbonyl O atoms of [LAC] interact with the C2-H of the imidazolium ring and the C-H of the ethyl group through the formation of triple H-bonds.

Low rank approximation in G0W0 calculations

The single particle energies obtained in a Kohn-Sham density functional theory(DFT) calculation are generally known to be poor approximations to electron excitation energies that are measured in transport,tunneling and spectroscopic experiments such as photo-emission spectroscopy. The correction to these energies can be obtained from the poles of a single particle Green's function derived from a many-body perturbation theory. From a computational perspective, the accuracy and efficiency of such an approach depends on how a self energy term that properly accounts for dynamic screening of electrons is approximated. The G_0W_0 approximation is a widely used technique in which the self energy is expressed as the convolution of a noninteracting Green's function(G_0) and a screened Coulomb interaction(W_0) in the frequency domain. The computational cost associated with such a convolution is high due to the high complexity of evaluating W_0 at multiple frequencies. In this paper, we discuss how the cost of G_0W_0 calculation can be reduced by constructing a low rank approximation to the frequency dependent part of W_0. In particular, we examine the effect of such a low rank approximation on the accuracy of the G_0W_0 approximation. We also discuss how the numerical convolution of G_0 and W_0 can be evaluated efficiently and accurately by using a contour deformation technique with an appropriate choice of the contour.