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跨坐式单轨车辆走行轮系刚度优化分析

内燃机与配件 2024年第4期 45-47页

作者：张钟园重庆交通大学机电与车辆工程学院重庆400074

为了改善跨坐式单轨车辆的曲线通过性能,对跨坐式单轨车辆的结构进行简单分析,采用动力学仿真软件SIMPACK建立动力学仿真模型,通过多目标优化软件ISIGHT对部分刚度参数进行灵敏度分析,得到对车辆过弯时对导向力矩和走行轮轮重减载率影... 详细信息

为了改善跨坐式单轨车辆的曲线通过性能,对跨坐式单轨车辆的结构进行简单分析,采用动力学仿真软件SIMPACK建立动力学仿真模型,通过多目标优化软件ISIGHT对部分刚度参数进行灵敏度分析,得到对车辆过弯时对导向力矩和走行轮轮重减载率影响较大的参数,并采用多岛遗传算法对目标参数进行优化分析,优化后的导向力矩比优化前减少了12.52%,走行轮轮重减载率比优化前减小了15.98%,在一定程度上提高了跨坐式单轨车辆的曲线通过性能。

关键词：跨坐式单轨车辆导向力矩减载率多岛遗传算法

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辉光放电质谱法测定高温合金中的氧氮元素

分析测试学报 2024年第9期43卷 1370-1375页

作者：李晓旭王长春李辉张重远中国科学院金属研究所辽宁沈阳110016

通过优化放电参数,分析质谱干扰,校正相对灵敏度因子(RSF),对高温合金中的氧和氮元素进行测试,并将结果与氧氮氢分析仪检测结果进行比较。结果显示,使用辉光放电质谱仪和氧氮氢分析仪测定高温合金中氧和氮元素结果的偏差分别为小于10%... 详细信息

通过优化放电参数,分析质谱干扰,校正相对灵敏度因子(RSF),对高温合金中的氧和氮元素进行测试,并将结果与氧氮氢分析仪检测结果进行比较。结果显示,使用辉光放电质谱仪和氧氮氢分析仪测定高温合金中氧和氮元素结果的偏差分别为小于10%和小于5.0%,且结果稳定性的相对标准偏差小于5.0%。校正后的RSF值可信,测试结果稳定可靠。

关键词：辉光放电质谱法高温合金氧氮元素测定 RSF校正

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Propagation of a Rectangular Pulse in an Anomalous Dispersive Medium

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Communications in Theoretical Physics 2002年第8期38卷 224-226页

作者： HUANG Chao-Guang zhang yuan-zhong Institute of High Energy Physics the Chinese Academy of Sciences P.O. Box 918 Beijing 100039 China Institute of Theoretical Physics the Chinese Academy of Sciences P.O. Box 2735 Beijing 100080 China Institute of Theoretical Physics the Chinese Academy of Sciences P.O. Box 2735 Beijing 100080 China CCAST (World Laboratory) P.O. Box 8730 Beijing 100080 China

The pulse with a rectangular envelop propagating through the caesium vapour with two gain lines used inthe Wang, Kuzmich, and Dogariu [Nature (London) 406 (2000) 277] experiment is studied. It is shown that there exis... 详细信息

关键词： propagation of rectangular pulse, anomalous dispersive medium

Proposed New Test of Equivalence Principle from Rotating Bodies

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Chinese Physics Letters 2000年第5期17卷 324-325页

作者： zhang yuan-zhong LUO Jun NIE Yu-Xin Institute of Theoretical Physics Chinese Academy of SciencesBeijing 100080 Department of Physics Huazhong University of Science and TechnologyWuhan 430074 Institute of Physics Chinese Academy of SciencesBeijing 100080

We study a new kind of equivalence principle for rotating bodies and propose a test of the equivalence principle by comparing free-fall gravitational accelerations of two gyroscopes or a rotating and a non-rotating ex... 详细信息

关键词： rotating equivalence acceleration

A New Estimate for the Dispersion Velocity of Galactic Dark Matter Particles

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Chinese Physics Letters 1998年第8期15卷 617-619页

作者： ZHU Zong-hong WU Jiang-hua zhang yuan-zhong Institute of Theoretical Physics Chinese Academy of SciencesBeijing 100080 Department of Astronomy Beijing Normal UniversityBeijing 100875

An independent method is proposed to estimate the dispersion velocity of galactic dark matter *** method is based on the observed quasar-galaxy association samples that are caused by gravitational *** resulting dispersion velocities are much higher than-220km·s^(-1),a value expected from the virial theorem,which shows that the conventional assumption of virialization may be invalid in the halo regions of galaxies.

关键词： particles. dispersion Dispersion

On Representation Transformation in Einstein Quantum Cosmology

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Chinese Physics Letters 1993年第4期10卷 201-204页

作者： DING Haogang HUANG Chaoguang zhang yuan zhong Department of Physics Peking UniversityBeijing 100871 Institute of High Energy Physics Academia SinicaBeijing 100039 Center of Theoretical Physics CCAST(World Laboratory)Beijing 100080 Institute of Theoretical Physics Academia SinicaBeijing 100080

We consider invertibility and consistency conditions in representation transformation in quantum cosmology,which is regarded as a necessary condition to pick up physical states of the *** of approaches to construct a ... 详细信息

关键词： theory Einstein quantum

Robustness of the Sunyaev-Zel’dovich Effect as a Measure of the Hubble Constant

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Chinese Physics Letters 2001年第4期18卷 622-624页

作者： CAO Li zhang yuan-zhong ZHU Zong-Hong Beijing Astronomical Observatory Chinese Academy of SciencesBeijing 100012 National Astronomical Observatories Chinese Academy of SciencesBeijing 100012 Institute of Theoretical Physics Chinese Academy of SciencesBeijing 100080

After inversing the x-ray surface brightness of the cooling flow cluster Abell 1689 through the isothermal β model,the isothermal double β model and the x-ray surface brightness distribution model derived from the universal dark matter density profile,we calculate the electron distribution and the Sunyaev-Zel'dovich(SZ)effect of the *** resulting temperature decrements,which are inversely proportional to the square root of H0,are very different for the three models,with uncertainty of 15%.Thus,the SZ/x-ray route can not be taken as a precise measurement of H0 until further observations(*** the satellite AXAF)constrain well the amount and distribution of cluster gas.

关键词： distribution cluster isothermal

Numerical simulation of transient characteristics in a bulb turbine during the load rejection process

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Journal of Hydrodynamics 2024年第1期36卷 170-183页

作者： Yue Lu Yu-quan zhang zhong-wei He yuan Zheng College of Water Conservancy and Hydropower Engineering Hohai UniversityNanjing210098China College of Energy and Electrical Engineering Hohai UniversityNanjing210098China Huadong Engineering Corporation Ltd. Hangzhou311122China

To evaluate the safety of the bulb tubular turbine,the dynamic hydraulic characteristics of a hydropower station system during the load rejection process are studied through numerical simulations and a prototype *** the developed model,a dynamic grid technology(DGT)controls the closure of the guide vane and the blade,whilst the moment balance equation and the user-defined function(UDF)provide the runner’s rotation *** 3-D transient simulation method can well predict the rotation speed and mass flow curves in the state of load *** simulation outcomes of the system performance are basically consistent with the measurement data of the *** observed,the runner is subjected to the reversely increased torque and axial force,the system is in a braking phase,and the maximum speed peaks at 144.6%of the rated ***,the internal flow of the runner is greatly affected by the closure of the guide vane,and the draft tube forms an eccentric spiral vortex *** breaks downstream,aggravating the instability of the draft ***,the transient characteristics span for the first five seconds,demonstrating the importance of establishing an efficient governing *** obtained results are useful for designing the turbine’s flow channel with a double regulating function and comprehending the turbine’s transient characteristics.

关键词： Bulb tubular turbine load rejection numerical simulation dynamic grid prototype test

Effect of wall-disruption on nutrient composition and in vitro digestion of camellia and lotus bee pollens

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Food Science and Human Wellness 2024年第3期13卷 1567-1577页

作者： yuan yuan Shun zhong Zeyuan Deng Guangyan Li Jinwu zhang Hongyan Li State Key Laboratory of Food Science and Resources Nanchang UniversityNanchang 330047China Nanchang Tongxin Zichao Biological Engineering Co. Ltd.Nanchang 330052China

The nutrient digestion,absorption and biological activity of bee pollen may be limited due to the complex pollen ***,the effect of superfine grinding technology on the release of nutrients from bee pollen were investigated,and their antioxidant activities and in vitro digestion were explored in this *** showed that the content of nutrients in bee pollen increased after wall *** them,fat content increased by 22.55%-8.31%,protein content increased by 0.54%-4.91%,starch content increased by 36.31%-48.64%,soluble sugar content increased by 20.57%-29.67%,total phenolic acid content increased by 11.73%-86.98%and total flavonoids content increased by 14.29%-24.79%.At the same time,the antioxidant activity increased by 14.84%-46.00%.Furthermore,the active components such as phenolic compounds in the wall-disruption bee pollen were more readily to be released during the in vitro digestion,and easier to be absorbed because of their higher *** activities during in vitro digestion were also improved in walldisruption bee *** findings provide evidence that bee pollen wall disruption was suggested,thus,it is more conducive to exerting the value of bee pollen in functional foods.

关键词： Bee pollen Nutrients Wall disruption Phenolic compounds In vitro digestion

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