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Effect of the sloping seabed on 3D soil-spudcan interaction using a material point-finite element(MPM-FEM)model

Journal of Rock Mechanics and Geotechnical Engineering 2024年第4期16卷 1436-1454页

作者： zhengda lei Guangtian Zeng Huaihui Ren Bisheng Wu Yuxin Jie State Key Laboratory of Hydroscience and Engineering Department of Hydraulic EngineeringTsinghua UniversityBeijingChina Key Laboratory of the Hydrosphere Sciences of the Ministry of Water Resources BeijingChina Institute of Ocean Engineering Tsinghua UniversityBeijingChina Longyuan (Beijing) Wind Power Engineering Technology Co. Ltd.BeijingChina

The sloping seabed affects the bearing capacity and failure mechanism of soil,which may compromise the stability and safety of offshore structures such as jack-up *** paper employs a coupled model combining the material point method and finite element method(MPM-FEM)to analyze the impact of sloping seabeds on the three-dimensional soil-spudcan *** MPM-FEM model implements the B¯approach to solve the challenge of volumetric locking due to the incompressibility constraints imposed by yield *** is validated against the centrifuge *** effects of sloping seabeds on penetration resistance,soil flow pattern,lateral response,stress distribution,and failure mechanism are *** soil mainly undergoes overall failure when the ratio of penetration depth to spudcan diameter(i.e.D P/D)is between 0 and *** the slope angle increases,the soil on the side of lower slope is expelled further,resulting in an asymmetric stress distribution and a larger horizontal sliding force of *** D P/D increases to 0.75,the soil transitions to localized plastic flow failure,and the range of soil flow affected by the spudcan penetration *** results show that,when the slope angle increases,the lateral displacement and stress distribution on the lower slope of a sloping seabed is significantly larger than that of a horizontal seabed,impacting the spudcan and surrounding soil *** study suggests that the seabed slope significantly affects the range of soil flow and failure at shallow penetration,indicating that the slope angle should be taken into account in the design and installation of offshore jack-up rigs,particularly in areas with sloping seabeds.

关键词： Soil-spudcan interaction Centrifuge tests MPM-FEM model B—approach Sloping seabeds Offshore structures

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Effect of Rapeseed Straw on Growth and Slaughter Performance of Sichuan White Goose

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Animal Husbandry and Feed Science 2017年第6期9卷 360-362页

作者： Yang Ting lei zhengda Zhang Yishu Yu Zhiqiang Wang Dayi Sichuan Cereals and Oil Research Institute

[ Objective ] The paper was to study the effects of rapeseed straw on growth and slanghter performance of Sichuan white goose. [ Method ] Totally 400 3-day-old Sichuan white geese were randomly divided into four groups ; geese in control group were fed with the fundamental diet ; geese in group 1, group 2 and group 3 were fed with the fundamental diet containing 5%, 10% and 10% rapeseed straw instead of equal amount of wheat bran, respectively. The body weight and slaughter performance of Sichuan white geese in control group, group 1 and group 2 were determined at 10 weeks of age, while those in group 3 were determined at 14 weeks of age. [ Result] There was no significant difference in gross weight, slaughter weight, eviscerated weight with giblet, head weight, sole weight, wing weight, neck weight, muscular stomach weight and intestine indexes of 10-week-old white geese between group 1 and control group, and between group 2 and con- trol group （ P 〉 0.05 ） ; the live weight slightly decreased. The growth and slaughter performance of 14-week-old Sichuan white geese were significantly higher fllan that of 10-week-old geese （P 〈0.05）, with better meat and flavor, but relatively low average daily gain （P 〈0.05 ） ; there was no significant impact on muscular stomach pH and intestinal pH （P 〉 0.05 ）. [ Conclusion] Substituting partial wheat bran with rapeseed straw can satisfy the diet requirement of Sichuan white geese, but has no significant impact on its growth and slaughter performance （ P 〉 0.05）.

关键词： Rapeseed straw Sichuan white geese Growth performance Slaughter performance Meat quality

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碲铋基热电材料的制备工艺

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热加工工艺 2013年第4期42卷 82-85页

作者：雷正大林国英张勇陈振瑞华南师范大学物理与电信工程学院广东广州510006 华南师范大学化学与环境学院广东广州510066

综述了主要的碲铋热电合金的制备工艺,分析了各种制备方法的优点和存在的问题,展望了今后材料制备的研究方向。

关键词：碲铋合金热电制备工艺

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稻谷中镉的测定及加工精度对镉含量的影响研究

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粮食科技与经济 2020年第6期45卷 91-94页

作者：何瑞雷正达龚洋李莉李进春四川省粮油科研所四川成都611130

本研究对比3种不同前处理方法(硝酸直接浸提、微波消解、干法灰化)对稻谷中镉含量测定的影响,以找到一种操作简单、快速、准确的前处理方法,在此基础上研究加工精度对稻谷中镉含量的影响。结果表明,这3种方法测定试验结果无显著差异,但1... 详细信息

本研究对比3种不同前处理方法(硝酸直接浸提、微波消解、干法灰化)对稻谷中镉含量测定的影响,以找到一种操作简单、快速、准确的前处理方法,在此基础上研究加工精度对稻谷中镉含量的影响。结果表明,这3种方法测定试验结果无显著差异,但1%硝酸直接浸提法操作简单、快速,该方法相对标准偏差RSD为2.05%~6.34%,检出限为2.49μg/kg,能满足稻谷中镉含量快速测定。通过砻谷、碾米得到不同加工精度大米,并测定其镉含量,结果表明,镉在稻谷中的含量基本呈现糙米>精米>稻壳的趋势,碾米15s镉去除率为4.97%,碾米25s镉去除率为6.35%,碾米35s镉去除率为8.56%。随着加工精度的增加,稻谷中镉含量呈下降趋势,适当提高加工精度可降低大米中的镉含量,但是当镉含量严重超标时,进一步提高碾米精度会减少米中的营养物质,建议采用其他方式降低大米中镉含量。

关键词：直接浸提加工精度稻谷镉

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不同储藏条件下可发芽糙米品质变化的研究

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粮食科技与经济 2018年第7期43卷 49-51页

作者：李莉税丹龚洋何瑞李进春雷正达四川省粮油科研所四川成都610017

针对可发芽糙米在储存过程中的主要问题,本文通过研究不同储存条件对糙米品质变化的影响,寻求最佳的储存条件,保持可发芽糙米的品质以及胚体活力。采用单因素方法,研究温度、水分对可发芽糙米的脂肪酸值以及发芽率的影响。找到最佳储存... 详细信息

针对可发芽糙米在储存过程中的主要问题,本文通过研究不同储存条件对糙米品质变化的影响,寻求最佳的储存条件,保持可发芽糙米的品质以及胚体活力。采用单因素方法,研究温度、水分对可发芽糙米的脂肪酸值以及发芽率的影响。找到最佳储存条件为低温(5℃)条件下水分含量控制在13.5%以内,可以保证可发芽糙米的品质。

关键词：可发芽糙米储藏温度储藏水分脂肪酸值发芽率

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微波消解-原子荧光光谱法测定大米中总砷含量

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粮食科技与经济 2023年第2期48卷 82-84页

作者：何瑞李莉李进春龚洋李华英闫文婧雷正达四川省粮油科研所四川成都611130

采用微波消解-原子荧光光谱法测定大米中总砷含量,研究了微波消解时消解体系的配比、消解浸泡时间和试剂选择对大米中总砷含量的影响。结果表明:在HNO3用量为8 mL,H2O2用量为3 mL,浸泡时间为15 h的条件下,实验测量值与真实值最接近。总... 详细信息

采用微波消解-原子荧光光谱法测定大米中总砷含量,研究了微波消解时消解体系的配比、消解浸泡时间和试剂选择对大米中总砷含量的影响。结果表明:在HNO3用量为8 mL,H2O2用量为3 mL,浸泡时间为15 h的条件下,实验测量值与真实值最接近。总砷含量在0~10μg/L的质量浓度范围内具有良好的线性关系,相关系数为0.9996,检出限为0.0018 mg/kg,利用该方法对不同大米样进行测定,测定值在真实值不确定范围内,相对标准偏差在5.5%以下,样品加标回收率为89%~95%。该方法可用于大米总砷含量的测定。

关键词：总砷原子荧光光谱法大米微波消解

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CBX4 deletion promotes tumorigenesis under Kras^(G12D) background by inducing genomic instability

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Signal Transduction and Targeted Therapy 2023年第10期8卷 4877-4888页

作者： Fangzhen Chen Wulei Hou Xiangtian Yu Jing Wu zhengda Li Jietian Xu Zimu Deng Gaobin Chen Bo Liu Xiaoxing Yin Wei Yu lei Zhang Guoliang Xu Hongbin Ji Chunmin Liang Zuoyun Wang Department of Human Anatomy and Histoembryology School of Basic Medical Sciences and Shanghai Xuhui Central HospitalShanghai Medical CollegeFudan UniversityShanghai 200030China Shanghai Xuhui Central Hospital Zhongshan-Xuhui HospitalFudan UniversityShanghai 200031China Clinical Research Center Shanghai Jjiao Tong University Affliated Sixth People's HospitalShanghaiChina State Key Laboratory of Cell Biology CAS Center for Excellence in Molecular Cell ScienceShanghai Institute of Biochemistry and Cell BiologyChinese Academy of SciencesShanghaiChina CAS Key Laboratory of Molecular Virology and Immunology Institute Pasteur of ShanghaiChinese Academy of SciencesShanghaiChina Department of General Surgery Jing'an District Central Hospital of ShanghaiFudan UniversityShanghaiChina Key Laboratory of Respiratory Disease People's Hospital of YangjiangYangjiangGuangdongChina

Chromobox protein homolog 4(CBX4)is a component of the Polycomb group(PcG)multiprotein Polycomb repressive complexes 1(PRC1),which is participated in several processes including growth,senescence,immunity,and tissue ***4 has been shown to have diverse,even opposite functions in different types of tissue and malignancy in previous studies.

关键词： immunity malignancy opposite

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Einstein Probe discovery of EP240408a:A peculiar X-ray transient with an intermediate timescale

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Science China(Physics,Mechanics & Astronomy) 2024年

作者： Wenda Zhang Weimin Yuan Zhixing Ling Yong Chen Nanda Rea Arne Rau Zhiming Cai Huaqing Cheng Francesco Coti Zelati Lixin Dai Jingwei Hu Shumei Jia Chichuan Jin Dongyue Li Paul O’Brien Rongfeng Shen Xinwen Shu Shengli Sun Xiaojin Sun Xiaofeng Wang lei Yang Bing Zhang Chen Zhang Shuang-Nan Zhang Yonghe Zhang Jie An David Buckley Alexis Coleiro Bertrand Cordier Liming Dou Rob Eyles-Ferris Zhou Fan Hua Feng Shaoyu Fu Johan P. U. Fynbo Lluis Galbany Saurabh W. Jha Shuaiqing Jiang Albert Kong Erik Kuulkers Weihua lei Wenxiong Li Bifang Liu Mingjun Liu Xing Liu Yuan Liu Zhu Liu Chandreyee Maitra Alessio Marino Itumeleng Monageng Kirpal Nandra Jeremy Sanders Roberto Soria Lian Tao Junfeng Wang Song Wang Tinggui Wang Zhongxiang Wang Qingwen Wu Xuefeng Wu Dong Xu Yanjun Xu Suijian Xue Yongquan Xue Zijian Zhang Zipei Zhu Hu Zou Congying Bao Fansheng Chen Houlei Chen Tianxiang Chen Wei Chen Yehai Chen Yifan Chen Chenzhou Cui Weiwei Cui Yanfeng Dai Dongwei Fan Ju Guan Dawei Han Dongjie Hou Haibo Hu Maohai Huang Jia Huo Zhenqing Jia Bowen Jiang Ge Jin Chengkui Li Junfei Li Longhui Li Maoshun Li Wei Li zhengda Li Tianying Lian Congzhan Liu Heyang Liu Huaqiu Liu Fangjun Lu Laidan Luo Jia Ma Xuan Mao Haiwu Pan Xin Pan Liming Song Hui Sun Yunyin Tan Qingjun Tang Yihan Tao Hao Wang Juan Wang lei Wang Wenxin Wang Yilong Wang Yusa Wang Qinyu Wu Haitao Xu Jingjing Xu Xinpeng Xu Yunfei Xu Zhao Xu Changbin Xue Yulong Xue Ailiang Yan Haonan Yang Xiongtao Yang Yanji Yang Juan Zhang Mo Zhang Wenjie Zhang Zhen Zhang Zhen Zhang Ziliang Zhang Donghua Zhao Haisheng Zhao Xiaofan Zhao Zijian Zhao Hongyan Zhou Yilin Zhou Yuxuan Zhu Zhencai Zhu Institut d’Estudis Espacials de Catalunya (IEEC) Max Planck Institute for Extraterrestrial Physics Innovation Academy for Microsatellites Chinese Academy of Sciences Department of Physics University of Hong Kong School of Physics and Astronomy University of leicester School of Physics and Astronomy Sun Yat-sen University National Astronomical Observatories Department of Physics Anhui Normal University Shanghai Institute of Technical Physics Chinese Academy of Sciences Physics Department Tsinghua University Nevada Center for Astrophysics University of Nevada Las Vegas Department of Physics and Astronomy University of Nevada Las Vegas Chinese Academy of Sciences South African Astronomical Observatory Department of Astronomy University of Cape Town Department of Physics University of the Free State Universite' Paris Cite' CNRS Astroparticule et Cosmologie Universite' Paris Cite' CEA Paris-Saclay School of Astronomy and Space Sciences IRFU/DAp-AIM Department of Astronomy Guangzhou University Cosmic Dawn Center (DAWN) Niels Bohr Institute University of Copenhagen Department of Physics and Astronomy Rutgers the State University of New Jersey Institute for Cosmic Ray Research University of Chinese Academy of Sciences The University of Tokyo ESA/ESTEC Noordwijk 2201 AZ The Netherlands Department of Astronomy School of Physics Huazhong University of Science and Technology INAF-Osservatorio Astrofisico di Torino Sydney Institute for Astronomy School of Physics Key Laboratory of Particle Astrophysics The University of Sydney Department of Astronomy Xiamen University Institute for Frontiers in Astronomy and Astrophysics Beijing Normal University Department of Astronomy University of Science and Technology Hefei School of Astronomy and Space Sciences University of Science and Technology of China Institute of High Energy Physics Institute of Deep Space Sciences Deep Space Exploration Laboratory Department of Astronomy School of Physics and Astronomy Yunnan University Shanghai Astronomical Observatory Chinese Academy of Science

We report the discovery of a peculiar X-ray transient,EP240408a,by Einstein Probe （EP） and follow-up studies made with EP,Swift,NICER,GROND,ATCA and other ground-based multiwavelength *** new transient was first detected with Wide-field X-ray Telescope （WXT） on board EP on April 8th,2024,manifested in an intense yet brief X-ray flare lasting for *** flare reached a peak flux of 3.9×10-9erg cm-2s-1in 0.5-4 keV,300 times brighter than the underlying X-ray emission detected throughout the *** and more precise follow-up observations by EP/FXT,Swift and NICER confirmed the finding of this new *** X-ray spectrum is non-thermal in 0.5-10 keV,with a power-law photon index varying *** X-ray light curve shows a plateau lasting for4d,followed by a steep decay till becoming undetectable10 d after the initial *** on its temporal property and constraints from previous EP observations,an unusual timescale in the range of 7-23 d is found for EP240408a,which is intermediate between the commonly found fast and long-term *** counterparts have been found in optical and near-infrared,with the earliest observation at 17 h after the initial X-ray detection,suggestive of intrinsically weak emission in these *** demonstrate that the remarkable properties of EP240408a are inconsistent with any of the transient types known so far,by comparison with,in particular,jetted tidal disruption events,gamma-ray bursts,X-ray binaries and fast blue optical *** nature of EP240408a thus remains an *** suggest that EP240408a may represent a new type of transients with intermediate timescales of the order of10 *** detection and follow-ups of more of such objects are essential for revealing their origin.

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一种大动态惯导技术在旋转弹上的仿真与实验研究

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弹箭与制导学报 2009年第2期29卷 4-8页

作者：王磊郝永平肖长韩政达沈阳理工大学微系统技术中心沈阳110168 北京航空航天大学机械工程与自动化学院北京100191

针对大动态环境下旋转弹的特点,在无陀螺惯性测量系统的基础上,采用一种基于MEMS双陀螺多加速度计的捷联惯导方案。该方案可以克服单纯加速度计的惯导方案对加速度测量和安装精度的苛刻要求,实现对弹轴方向角速度的解算。计算机仿真结... 详细信息

针对大动态环境下旋转弹的特点,在无陀螺惯性测量系统的基础上,采用一种基于MEMS双陀螺多加速度计的捷联惯导方案。该方案可以克服单纯加速度计的惯导方案对加速度测量和安装精度的苛刻要求,实现对弹轴方向角速度的解算。计算机仿真结果表明,导航解算的误差可以满足旋转弹的精度要求。在仿真分析基础上,给出了一种面向炮弹系统,基于FPGA双核处理器结构惯导系统的硬件实现方案。

关键词：大动态无陀螺捷联惯导系统姿态角速度双核系统 FPGA

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PLC通信复用的研究与应用

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丽水学院学报 2014年第2期36卷 20-22页

作者：雷伟敏洪龙辉胡正大丽水学院工学院浙江丽水323000

在通用串口上实现实时性不高的透明数据传送,具有直接读取多个开关量并直接传送的能力。充分利用现有滑触线路实现数据的传送,信号复用电路在接收到数据后还原成开关量信号传回PLC,大大提高了现有线路上的PLC信号的传输能力。

关键词： PLC 通信 MCU 复用

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