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Dynamic Plastic Analysis of Ship-Platform Collision

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China Ocean Engineering 1998年第1期13卷 23-32页

作者： Bao, YB Li, rp Gu, YN Shanghai Jiao Tong Univ Sch Naval Architecture & Ocean Engn Shanghai 200030 Peoples R China

This paper studies intensively the problems of ship-platform collision. The ship and platform are treated as one structural system connected with spring elements and then motion equation of the collision system is established. A nonlinear force-displacement relationship is derived for the simulation of local dent in a hit member and the yield surface of a dented tubular section is developed to consider the reduction of load carrying capacity of hit members. Large deformations, plasticity and strain-hardening of the beam-column element are taken into account by combining the elastic large displacement analysis theory with the plastic node method. The effect of the hydrodynamic forces acting on the platform, the rubber fender the property of the local dent and the buckling behavior of beam-column on collision are analyzed. The numerical simulation of the nonlinear dynamic response is carried out by Wilson theta method with updated Newton-Raphson iteration. And the numerical example of the dynamic response of a offshore platform in ship-platform collision is also present.

关键词： offshore platform collision strain-hardening dynamic plasticity

塞拉鲁替尼治疗成人动脉性肺动脉高压(TORREY):一项随机、双盲、安慰剂对照2期试验

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中华结核和呼吸杂志 2024年第9期47卷 895-895页

作者： Frantz rp McLaughlin VV Sahay S 陈日垦姚卫民不详广东医科大学附属第二医院呼吸与危重症医学科广州524003

背景:动脉性肺动脉高压(PAH)的发病率和病死率仍然很高。血小板源性生长因子受体、集落刺激因子1受体和肥大细胞或干细胞生长因子受体激酶的激活会刺激炎症、增殖和纤维化途径,从而驱动PAH中的肺血管重塑。塞拉鲁替尼(Seralutinib)是一... 详细信息

背景:动脉性肺动脉高压(PAH)的发病率和病死率仍然很高。血小板源性生长因子受体、集落刺激因子1受体和肥大细胞或干细胞生长因子受体激酶的激活会刺激炎症、增殖和纤维化途径,从而驱动PAH中的肺血管重塑。塞拉鲁替尼(Seralutinib)是一种吸入性激酶抑制剂,针对这些途径。该研究的目的是评估塞拉替尼对接受标准背景治疗的PAH患者的疗效和安全性。方法:TORREY试验是一项2期、随机、多中心、跨国、双盲、安慰剂对照研究。来自40家医院和社区站点的PAH患者通过交互式响应技术以1∶1的比例随机分配接受塞拉鲁替尼(60 mg,2次/d,持续2周,然后根据耐受性增加至90 mg,2次/d),或通过干粉吸入器每天两次接受安慰剂,持续治疗24周。根据基线肺血管阻力(PVR<800 dyn·s^(-1)·cm^(-5)和≥800 dyn·s^(-1)·cm^(-5))对随机分组进行分层。如果患者被归类为WHO第1组PH(PAH)、WHO功能等级Ⅱ或Ⅲ,且PVR为400 dyn·s^(-1)·cm^(-5)或以上,6 min步行距离在150~550 m之间,则患者符合入组资格。

关键词：安慰剂对照肺血管阻力干细胞生长因子动脉性激酶抑制剂肺血管重塑肺动脉高压肥大细胞

A NEW CYCLOPEPTIDE FROM VACCARIA SEGETALIS

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Chinese Chemical Letters 1995年第8期6卷 681-682页

作者： Zhang, rp Zou, C Chai, YK Zhou, J Acad Sinica Kunming Inst Bot Lab Phytochem Kunming 650204 Peoples R China

A new cyclopeptide designated as vaccarin A were isolated from the seeds of Vaccaria segetalis, Its structure was obtained by spectral evidence.

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On the Methods of Beam Direction and MisorientationAngle/Axis Determination by Systematic Tilt

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Journal of Materials Science & Technology 1999年第5期15卷 410-414页

作者： Rong, YH He, G Chen, SP Hu, GX Gao, M Wei, rp Shanghai Jiao Tong Univ Sch Mat Sci & Engn Shanghai 200030 Peoples R China Lehigh Univ Dept Mech Engn & Mech Bethlehem PA 18015 USA

The methods for determining electron beam direction and misorientation angle/axis of grain boundaries are described in this paper. The present methods are based on a series of diffraction spot patterns obtained by systematic tilt of the crystal, combined with simple mathematical calculations. Instead of the use of Kikuchi patterns, the limitations resulting from the visibility or sharpness of Kikuchi lines and the number of Kikuchi pole(s) existed are avoided and a sufficient accuracy of determination has been achieved.

关键词： Transmission electron microscopy

Extended Global Convergence Framework for Unconstrained Optimization

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Acta Mathematica Sinica,English Series 2004年第3期20卷 433-440页

作者： rpád BRMEN Franc BRATKOVI Janez PUHAN Iztok FAJFAR Tadej TUMA University of Ljubljana Faculty of Electrical EngineeringTr■aka Cesta 25SI-1000 LjubljanaSlovenia

An extension of the global convergence framework for unconstrained derivative-free op- timization methods is *** extension makes it possible for the framework to include opti- mization methods with varying cardinality of the ordered direction ***-based search methods are shown to be a special case of the more general extended global convergence ***, the required properties of the sequence of ordered direction sets listed in the definition of grid-based methods are relaxed and simplified by removing the requirement of structural equivalence.

关键词： Derivative free optimization Descent methods Convergence analysis Grid-based optimization

Structure of Ag/Bi multilayers

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Chinese Science Bulletin 1997年第16期42卷 1350-1353页

作者： Zhang, M Yu, W Liu, rp He, DW Wang, WK Chinese Acad Sci Inst Phys Beijing 100080 Peoples R China Chinese Acad Sci Int Ctr Mat Phys Shenyang 110015 Peoples R China

MULTILAYERS are often formed from two elemental layers deposited alternately. In recent years, multilayer thin films have been used increasingly in both basic research and technological fields because of their specific properties in electricity, light, magnetism and mechanics as well as their high interfacial density. In many applications, one has to consider the effects arising from microstructure. If the thickness of sublayers is very small (several nanometers),multilayers may exhibit a dimensional periodic structure (modulation structure) in the

关键词： Ag/Bi multilayers interface.

Predictors of long-term anxiety and depression in discharged COVID-19 patients:A follow-up study

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World Journal of Clinical Cases 2022年第22期10卷 7832-7843页

作者： Rabia Kevser Boyraz Ebru Sahan Muhammed Emin Boylu İsmet Kırpınar Department of Psychiatry Basaksehir Cam and Sakura Research and Training HospitalIstanbul 34480Turkey Department of Psychiatry Marmara Universityİstanbul 34854Turkey Department of Psychiatry Bezmialem Vakıf Universityİstanbul 34093Turkey

BACKGROUND Patients who were hospitalized for coronavirus disease 2019(COVID-19)faced an extremely stressful experience that challenged their mental health and the longterm effects are not definitely known *** To identify both the course of mental symptoms(anxiety and depressive symptoms)and the related risk factors of recovered patients at the 20-22 mo *** One hundred and seventy-two patients were *** patients were evaluated with a telepsychiatry interview and the Hospital Anxiety and Depression Scale(HADS).Sociodemographic and clinical features were analyzed by regression *** The mean HADS-Anxiety(HADS-A)score was 9.08±4.90,and the mean HADSDepression(HADS-D)score was 8.55±*** mean HADS-A(P=0.484)and HADS-D(P=0.011)scores were increased compared to scores during *** over 50 years old,having lower financial status,and being vaccinated were associated with symptoms of depression(adjusted R2=0.168)while being over 50 years old,female sex,being vaccinated,and dyspnea were associated with higher anxiety(adjusted R2=0.245).CONCLUSION To prevent the deterioration of mental health,psychiatrists should play an active role in identifying emerging mental problems as soon as possible,more vulnerable groups should be characterized,and psychological support should be sustained after discharge.

关键词： Coronavirus Anxiety disorders Depressive disorders Tele medicine Psychiatry