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作者： r.s.·劳伦斯(r.s..Lowrence)

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同伴在做什么?

桥牌 2024年第1期 60-61页

作者：迈克·劳伦斯不详

这是一个每天都会发生的常见局势。右手方开叫,你加倍,左手方再加倍表示一手好牌。此时你方已经被对手瞄准了,有可能会面临大麻烦。同伴叫1红桃,右手方不叫,你现在应该叫什么呢?这取决于你对同伴的持牌有何期望。

关键词：同伴加倍右手

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巴菲特:伯克希尔哈撒韦如何打造企业文化

中外企业文化 2024年第4期 66-68页

作者：劳伦斯·坎宁安不详

关于企业文化,巴菲特喜欢引用英国前首相温斯顿·丘吉尔的名言:“我们塑造了建筑,然后建筑开始塑造我们。”那些子公司都是自行选择成为伯克希尔家族一员的。那些企业主,除非他们认可公司文化的规范和标准,否则他们不会把公司卖给伯克... 详细信息

关于企业文化,巴菲特喜欢引用英国前首相温斯顿·丘吉尔的名言:“我们塑造了建筑,然后建筑开始塑造我们。”那些子公司都是自行选择成为伯克希尔家族一员的。那些企业主,除非他们认可公司文化的规范和标准,否则他们不会把公司卖给伯克希尔。2022年4月6日伯克希尔哈撒韦股价517002美元,是历史上股价最高的股票,总市值7616亿美元。2022年“财富世界500强”中伯克希尔哈撒韦列第11位。如果1965年投资1万美元购买伯克希尔(BrK)股票,那么在2021年将拥有3.64亿美元。伯克希尔哈撒韦管理的总资产约1万亿美元,其中1500亿美元是现金或债券等流动性资产,3500亿美元是持仓股票,5000亿美元是股权投资,控制着美国的运输、能源和通讯等关键基础设施以及很多现金流非常充裕的传统企业。而伯克希尔哈撒韦的老板就是大名鼎鼎的巴菲特!

关键词：关键基础设施世界500强流动性资产巴菲特现金流伯克希尔持仓哈撒韦

Nonstationary laser.s..ported ionization wave in layer of porous substance with subcritical density

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Matter and radiation at Extremes 2024年第1期9卷 58-70页

作者： s.Yu Gus’kov r.A.Yakhin P.N.Lebedev Physical Institute of r.s..an Academy of sciences Leninskii Prospect 53Moscow 119991Russia

A time-dependent analytical solution is found for the velocity of a plane ionization wave generated under nanosecond laser pulse action on the surface of a flat layer of low-Z porous substance with density less than the critical density of the produced *** corrections for the two-dimensional nature of the problem when a laser beam of finite radius interacts with a flat target,this solution is in quantitative agreement with measurements of ionization wave velocity in various *** solution compared with experimental data covering wide ranges of performance conditions,namely,(3-8)×10^(14)W cm^(−2)for laser pulse intensity,0.3-3 ns for pulse duration,0.35-0.53μm for laser wavelength,100-1000μm for laser beam radius,380-950μm for layer thickness,4.5-12 mg cm^(−3)for average density of porous substance,and 1-25μm for average pore *** parameters of the laser beam that ensure the generation of a plane ionization wave in a layer of subcritical porous matter are determined for the problem statements and are found to meet the requirements of practical applications.

关键词： laser pulse porous

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梵高和向日葵

小学阅读指南（高年级版） 2024年第8期 7-9页

作者： [英]劳伦斯·安荷特不详

在卡米耶居住的那个地方,长得高高的向日葵,看起来好像真正的太阳,一整片田野都燃烧着黄色的“太阳”。每天放学后,卡米耶都会从向日葵丛中跑过去迎接爸爸。卡米耶的爸爸是一位邮递员。有一天,一个陌生人来到了卡米耶所在的小镇。他戴... 详细信息

在卡米耶居住的那个地方,长得高高的向日葵,看起来好像真正的太阳,一整片田野都燃烧着黄色的“太阳”。每天放学后,卡米耶都会从向日葵丛中跑过去迎接爸爸。卡米耶的爸爸是一位邮递员。有一天,一个陌生人来到了卡米耶所在的小镇。他戴着一顶草帽,留着黄色的胡须,他那灵活的褐色眼睛不停地环顾着四周。

关键词：向日葵陌生人太阳黄色

FEA-based Geometrical Modification of switched reluctance Motor for radial Force reduction

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Chinese Journal of Electrical Engineering 2024年第1期10卷 124-135页

作者： rani s Jayapragash r school of Electrical Engineering Vellore Institute of TechnologyChennai 600127India

switched reluctance motors(sr.s..re becoming increasingly popular in the automotive sector owing to their robust ***,sr.s..re preferred particularly for EV applications owing to their fault tolerance,magnet-free structure,and high power/torque *** main concer.s..f srM compared to other machines include torque ripple and *** primary cause of vibration is the radial force created by the srM.A geometry-based modification of the srM to reduce the radial force without significantly changing the average torque produced is *** primary goal is to design a 4-phase,8/6 srM with a lower radial *** possible geometrical alterations are proposed:one with square windows and the other with circular holes on the rotor *** windows are sized and positioned to avoid flux *** criteria are developed for the optimal window size and *** element analysis(FEA)modelling of the srM is used to validate its *** FEA r.s..ts are compared with the performance parameters obtained using the analytical *** the multiphysics design tool ANsYs to obtain the natural frequencies and associated deformations through modal *** to the conventional geometry,the radial force is significantly reduced by providing windows.

关键词： 8/6 srM radial force modal analysis FEA analysis natural frequencies srM with windows

Kinematic analysis of flexible bipedal robotic systems

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Applied Mathematics and Mechanics(English Edition) 2024年第5期45卷 795-818页

作者： r.FAZEL A.M.sHAFEI s.r.NEKOO Department of Mechanical Engineering Shahid Bahonar University of KermanKerman ***Iran Departamento de Ingenieria de sistemas y Automatica Escuela Técnica Superior de IngenieriaUniversidad de SevillaSeville 41092Spain

In spite of its intrinsic complexities,the passive gait of bipedal robots on a sloping ramp is a subject of inter.s..for numerous *** distinguishes the pr.s..t r.s..rch from similar wor.s..s the consideration of flexibility in the constituent links of this type of robotic *** is not a far-fetched assumption because in the transient(impact)phase,due to the impulsive forces which are applied to the system,the likelihood of exciting the vibration modes increases ***,the human leg bones that are involved in walking are supported by viscoelastic muscles and ***,for achieving more exact r.s..ts,it is essential to model the robot links with viscoelastic *** this end,the Gibbs-Appell formulation and Newton's kinematic impact law are used to derive the most general form of the system's dynamic equations in the swing and transient phases of *** most important issue in the passive walking motion of bipedal robots is the determination of the initial robot configuration with which the system could accomplish a periodic and stable gait solely under the effect of gravitational *** extremely unstable nature of the system studied in this paper and the vibrations caused by the impulsive forces induced by the impact of robot feet with the inclined surface are some of the very serious challenges encountered for achieving the above-mentioned *** overcome such challenges,an innovative method that uses a combination of the linearized equations of motion in the swing phase and the algebraic motion equations in the transition phase is pr.s..ted in this paper to obtain an eigenvalue *** solving this problem,the suitable initial conditions that are necessary for the passive gait of this bipedal robot on a sloping surface are *** effects of the character.s..c parameters of elastic links including the modulus of elasticity and the Kelvin-Voigt coefficient on the walking stability of this type of

关键词： bipedal robot flexible link swing phase transient phase eigenvalue problem Kelvin-Voigt coefficient

行星科学研究中热发射光谱的实验测量与定标方法

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空间科学学报 2024年第2期44卷 270-286页

作者：杨亚洲 MILLIKEN ralph E BrAMBLE Michael s PATTErsON William r 邹永廖刘洋中国科学院国家空间科学中心空间天气学国家重点实验室北京100190 布朗大学地球环境与行星科学学院普罗维登斯02912

准确的物质组成信息是解译行星体形成与演化历史的关键,可见–近红外遥感光谱探测一直是获取行星表面成分的主要技术手段.在热红外谱段光谱特征更为丰富,因此随着探测技术的发展,其在行星探测中得到越来越多的应用.尤其是在目前已经实... 详细信息

准确的物质组成信息是解译行星体形成与演化历史的关键,可见–近红外遥感光谱探测一直是获取行星表面成分的主要技术手段.在热红外谱段光谱特征更为丰富,因此随着探测技术的发展,其在行星探测中得到越来越多的应用.尤其是在目前已经实施与立项的国内外小行星探测任务中,都将热发射光谱仪作为核心载荷之一.为了更好地对将来获取的热发射光谱数据进行解译,建立科学合理的数据处理与定标方案是必不可少的.本文对用于行星科学研究的热发射光谱测量装置的设计、测量及数据处理方法进行了系统分析.针对低温、真空条件下热发射测量过程中样品辐射信号与仪器辐射信号难以分离的问题,提出并论证了基于傅里叶变换红外光谱仪原始测量信号–干涉图的数据处理方法.该方法可以更为有效地分离出样品实际辐射信号,从而获得更为准确的发射率光谱数据.研究结果可为国内相关热发射测量装置的设计与搭建以及未来天问二号等探测数据的处理与科学解译提供参考.

关键词：行星探测热发射光谱实验室测量定标

Parametric investigation on the novel and cost-effective nano fly ash impregnated geopolymer.s..tem for.s..tainable construction

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Frontiers of structural and Civil Engineering 2024年第2期18卷 170-183页

作者： r.MOHANA s.M.Leela BHArATHI Department of Civil Engineering Mepco Schlenk Engineering CollegeSivakasi 626123India

The hazardous environmental effects of greenhouse gas emissions and climate change demand alternative sources for cementitious materials in the construction *** development of geopolymer.s..uctur.s..rovides a way of producing 100%cement-free *** this r.s..rch work,a novel and simple way of deriving nano particles from waste fly ash particles is *** effect of adding the synthesized nano fly ash particles as a filler medium in geopolymer mortars was investigated by considering strength and durability *** optimization was done by using regr.s..on analysis on the geopolymer mortar and the impact of adding nano fly ash particles was studied by varying different percentages of addition ranging from 0 to 7.5%by weight of binder *** the r.s..ts,it was observed that 1%nano fly ash acted not only as a filler but also as nano-sized precursors of the polymerization process,r.s..ting in denser geopolymer *** can explain the extraordinary gain in strength of 72.11 MPa as well as the denser core with negligible level of chloride ion penetration,making the material suitable for the development of structur.s..usceptible to marine environment.

关键词： geopolymer nano fly ash chloride ion penetration durability polymerization fillers

An Efficient Modelling of Oversampling with Optimal Deep Learning Enabled Anomaly Detection in streaming Data

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China Communications 2024年第5期21卷 249-260页

作者： r.rajakumar.s..athiya Devi srinivasa ramanujan Centre SASTRA Deemed UniversityKumbakonamTamil Nadu 612001India University College of Engineering BIT CampusAnna UniversityTiruchirappalli 620024India

recently,anomaly detection(AD)in streaming data gained significant attention among r.s..rch communities due to its applicability in finance,business,healthcare,education,*** recent developments of deep learning(DL)models find helpful in the detection and classification of *** article designs an oversampling with an optimal deep learning-based streaming data classification(Os-ODLsDC)*** aim of the OsODLsDC model is to recognize and classify the pr.s..ce of anomalies in the streaming *** proposed Os-ODLsDC model initially undergoes preprocessing *** streaming data is unbalanced,support vector machine(sVM)-synthetic Minority Over.s..pling Technique(sVM-sMOTE)is applied for oversampling ***,the Os-ODLsDC model employs bidirectional long short-term memory(Bi LsTM)for AD and ***,the root means square propagation(r.s..op)optimizer is applied for optimal hyperparameter tuning of the Bi LsTM *** ensuring the promising performance of the Os-ODLsDC model,a wide-ranging experimental analysis is performed using three benchmark datasets such as CICIDs 2018,KDD-Cup 1999,and NsL-KDD datasets.

关键词： anomaly detection deep learning hyperparameter optimization oversampling sMOTE streaming data