张八岭隆起南缘早白垩世火山岩稀土元素对比研究

张八岭隆起南缘早白垩世火山岩与北大别山东部、庐枞盆地、鲁西同期火山岩同属于中国东部岩石圈伸展减薄背景下形成的火山岩。然而稀土元素地球化学特征却反映出，张八岭隆起南缘火山岩来源于壳幔过渡带。而北大别山东缘同期火山岩与岩浆上升过程中地壳物质的混染有关，庐枞盆地火山岩岩浆来自与俯冲洋壳有关的富集地幔部分熔融，鲁西地区火山岩岩浆与俯冲的陆壳在地幔源区发生混染和交代形成的富集型地幔部分熔融有关。稀土元素研究的结果与构造背景、微量元素以及Sr，Nd同位索等研究相吻合，进一步表明稀土元素在火山岩岩浆来源方面有很好的示踪作用。岩浆的来源不同以及研究区大型断裂的作用正是张八岭隆起地区成为金矿成矿远景区的重要原因。     

紧急锁止式安全带卷收器带感锁止触发过程的运动学研究

对某型号紧急锁止式安全带卷收器的带感锁止触发进行了研究.在阐明安全带带感锁止机构工作原理的基础上,重点研究了带感锁止触发过程的运动学特性.针对非线性触发锁止特性,分别推导了带感锁止触发的接触力-加速度-时间及加速度-分离角度-时间的运动学方程.结合卷收器设计参数方程进行了数值求解,得到了锁止触发的两阶段运动学特性.研究...     

航炮链带运动的计算机模拟

本文首先运用动力学理论对航炮弹带进行了动力学和撞击动力学的理论建模,然后再借助计算机技术对弹带的运动进行了数值和图形模拟。     

Proton loss of inner radiation belt during geomagnetic storm of 2018 based on CSES satellite observation

The proton distribution in inner radiation belt is often affected by strong geomagnetic storm disturbance. Based on the data of the sun-synchronous CSES satellite, which carries with several high energy particle payloads and was launched in February 2018, we analyzed the extensive proton variations in the inner radiation belt in a wide energy range of 2 MeV-220 MeV during 2018 major geomagnetic storm. The result indicates that the loss mechanism of protons was energy dependence which is consistent with some previous studies. For protons at low energy 2 MeV-20 MeV, the fluxes were decreased during main phase of the storm and did not come back quickly during the recovery phase, which is likely to be caused by Coulomb collision due to neutral atmosphere density variation. At higher energy 30 MeV-100 MeV, it was confirmed that the magnetic field line curvature scattering plays a significant role in the proton loss phenomenon during this storm. At highest energies > 100 MeV, the fluxes of protons kept a stable level and did not exhibit a significant loss during this storm.     

长治水泥厂区域地震地质环境评价

长治水泥厂位于山西隆起区南部长治盆地, 长治盆地属中强潜在震原区。场地附近晋获断裂现代活动相对较弱, 晚更新后断裂基本停止活动, 对水泥厂场地无直接影响。     

“一带一路”沿线国家通货膨胀周期的协动性研究

本文通过研究“一带一路”沿线国家通货膨胀周期的协动性及其影响因素,发现“一带一路”沿线国家通货膨胀周期波动存在较强的协幼性,究其原因很大程度上是源自发展中国家综合因素和贸易互补性因素.利用双重差分模型,文章进一步探索了“一带一路”政策的区域性和时效性,从统计分析的角度验证了该政策是切实有效的,为“一带一路”沿线国家在未来加强经济合作和政策协调提供了依据.     

Modeling of large scale solar cell handling robot with belt-driven flexible arms

To increase the competition of the solar energy collection system, the size of the solar panel module during the manufacturing process is being increased continuously. As the size of the solar panel increases, the size of the robot to handle the panel increased also. The change in scale of the robot inevitably results in the amplification of the adverse effect of the flexure. The main source of the flexure in the large scale solar cell panel handling system is the long and thin fork fingers of the hand and the solar cell panel. In addition, the belt-driven actuator system used by most of the large scale panel handling robot is another significant source of the vibration. In this paper, the flexible multi body dynamic model of a large scale solar cell panel handling robot, which is being designed and constructed with the help of Kyung Hee University, is developed. The belt-driven system in the robot is also modeled as flexible system and included in the robot to represent the actual vibration characteristics of the actuator system.     

AN APPLICATION OF MULTI‐CRITERIA DECISION MAKING INCORPORATING STOCHASTIC PRODUCTION FRONTIERS: A CASE STUDY OF ORGANIC COFFEE PRODUCTION IN KONA,HAWAII

Abstract In this paper, we develop a land use allocation model to search for the optimal ratio of organic (nonchemical) and conventional (chemical‐use) farming acreage. The idea is to incorporate stochastic production frontiers (SPFs) to a multi‐criteria decision making (MCDM) model as technological constraints. The objectives of this model are to maximize net returns, minimize chemical inputs, and optimize organic inputs given environmental and ecological concerns. The compromise solutions suggest the desirable ratio of organic and conventional farming acreage and targetable operations for each farming system to improve regional welfare. This method was applied to the Kona coffee belt, Hawaii, and the analysis determined the optimal proportion of organic and conventional Kona coffee farming fields as 0.265 to 0.735 in terms of optimizing community benefits or regional welfare.     

Observational Results of Space Energetic Particles Made by the Chinese Satellite Fengyun-1(B)

This paper presents the observational results of space energetic particles obtained by the Cosmic Ray Composition Monitor (CRCM)onboard the Chinese satellite, Fengyun-1(B). These results, including those of a few solar proton events, the geomagnetically trapped particles and the anomalous cosmic ray components, were obtained from 3 September 1990 to 15 February 1991. The observed elements include H, He, C, N, O and Fe of energies from 4—23 MeV/n. It was found that the proton fluxes of the Inner Radiation Belt (IRB) increased obviously during the period of solar proton event (SPE). A few kinds of heavy ions (Z≥6) were also detected in the IRB. As to the anomalous cosmic ray component (ACRC), in addition to C, N and O, anomalous iron particles were also recorded. Moreover, the effects of space particle radiation on the satellite are analyzed.