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Cushioning Performance of a Novel Polyurethane Foam Material Applied in Fragile Packaging

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Acta Mechanica Solida Sinica 2024年第3期37卷 487-497页

作者： Huifeng Xi Chunqiu Guo Jinbiao Yang xiaogang wang Bowei wang Shiqing Huang Zhiwei wang School of Mechanics and Construction Engineering Jinan UniversityGuangzhou510632China College of Packing Engineering Jinan UniversityZhuhai519070China MOE Key Lab of Disaster Forecast and Control in Engineering Jinan UniversityGuangzhou510632China Foshan Soft Valley Technology Co. Ltd.Foshan528000China

For fragile products,packaging requires cushioning protection to prevent irreversible damage from accidental falls,transportation impacts,and other *** new polyurethane foam(PUF)material demonstrates superior cushioning and vibration isolation performance in practical applications,effectively minimizing damage from *** and vibration experiments were conducted on packages comprising novel PUF,expandable polyethylene,ethylene-vinyl acetate copolymer foam,and *** verify that the new PUF material outperforms in cushioning and vibration isolation,as observed from the acceleration ***,a random vibration analysis of a packaging unit involving different thicknesses of PUF materials and bracelets reveals the enhanced vibration isolation effect within a specific thickness *** vibration results of the bracelet’s outer packaging align closely with finite element simulation results,validating the effectiveness of designing and optimizing the outer *** finite element simulation,deeper understanding and prediction of the bracelet’s vibration response under various conditions is achieved,facilitating optimized packaging design for better protection and vibration damping.

关键词： Flexible polyurethane foam Packaging of fragile goods Nonlinear dynamics Vibration frequency Finite element simulation

Numerical studies for plasmas of a linear plasma device HIT-PSI with geometry modified SOLPS-ITER

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Chinese Physics B 2024年第3期33卷 503-508页

作者：王敏聂秋月黄韬王晓钢张彦杰 School of Physics Harbin Institute of TechnologyHarbin 150001China School of Electrical Engineering and Automation Harbin Institute of TechnologyHarbin 150001China Laboratory for Space Environment and Physical Sciences Harbin Institute of TechnologyHarbin 150001China MOE (Ministry of Education) Key Laboratory of Materials Modification by Laser Ionand Electron BeamsSchool of PhysicsDalian Institute of TechnologyDalian 116024China

The HIT-PSI is a linear plasma device built for physically simulating the high heat flux environment of future reactor divertors to test/develop advanced target plate *** this study,the geometry-modified SOLPS-ITER program is employed to examine the effects of the magnetic field strength and neutral pressure in the device on the heat flux experienced by the target plate of the HIT-PSI *** findings of the numerical simulation indicate a positive correlation between the magnetic field strength and the heat flux ***,there is a negative correlation observed between the heat flux density and the neutral *** the magnetic field strength at the axis exceeds 1 tesla and the neutral pressure falls below 10 Pa,the HIT-PSI has the capability to attain a heat flux of 10 MW·m-2 at the target *** simulation results offer a valuable point of reference for subsequent experiments at HIT-PSI.

关键词： HIT-PSI heat flux linear plasma SOLPS-ITER device

基于皮尔逊相关系数选择的完全广义空间调制可见光通信系统

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光学学报 2024年第4期44卷 108-116页

作者：赵黎王小港王宁王昊西安工业大学电子信息工程学院陕西西安710021

针对传统天线选择算法在完全广义空间调制(FGSM)系统中运用会出现局限性且误码性能不理想等问题,提出一种基于皮尔逊(Pearson)相关系数的选择算法,其基本原理是根据不同位置的光电探测器与发光二极管组合之间的Pearson系数相关性进行天... 详细信息

针对传统天线选择算法在完全广义空间调制(FGSM)系统中运用会出现局限性且误码性能不理想等问题,提出一种基于皮尔逊(Pearson)相关系数的选择算法,其基本原理是根据不同位置的光电探测器与发光二极管组合之间的Pearson系数相关性进行天线选择,能够提升FGSM系统性能及扩大使用范围。结果表明:当误码率为10-3时,在发射天线数量为4、调制方式为脉幅调制的情况下,FGSM系统的传输速率相较于广义空间调制增加了1 bpcu(bit per channel use);采用基于Pearson相关系数选择算法后的完全广义空间调制-多输入多输出(FGSM-MIMO)系统相较于随机选择算法所需信噪比改善了5.1 dB,相较于最大范数选择算法改善了0.8 dB。综上所述,在同一时刻发送相同信息的情况下,基于Pearson相关系数选择算法的FGSM-MIMO系统在光空间通信领域具有更好的发展前景。

关键词：光通信多输入多输出完全广义空间调制天线选择算法皮尔逊相关系数误码率

Systemic therapy in gastrointestinal stromal tumors

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Oncology and Translational Medicine 2024年第3期10卷 110-118页

作者： Shaoli Li Hui wang xiaogang wang Rui Bai Qunan Sun Sujing Jiang Lifeng Sun Youping wang Ying Dong Department of Medical Oncology the Second Affiliated HospitalZhejiang University School of MedicineHangzhou 310009China Cancer Institute Key Laboratory of Cancer Prevention and InterventionMinistry of Educationthe Second Affiliated HospitalZhejiang University School of MedicineHangzhou 310009China Cancer Center Zhejiang UniversityHangzhou 310009China Department of Pathology the Cancer Hospital of the University of Chinese Academy of Sciences(Zhejiang Cancer Hospital)Institute of Basic Medicine and Cancer(IBMC)Chinese Academy of SciencesHangzhou 310022China Department of Pathology the Second Affiliated HospitalZhejiang University School of MedicineHangzhou 310009China Department of Respiratory and Critical Care Medicine the Fourth Affiliated Hospital of Zhejiang University School of MedicineYiwuChina Colorectal Surgery and Oncology the Second Affiliated HospitalZhejiang University School of MedicineHangzhou 310009China.

Gastrointestinal stromal tumors(GISTs)are the most common type of soft tissue sarcoma in the gastrointestinal *** GISTs have been attributed to activated gain-of-function mutations in either KIT or platelet-derived growth factor receptorα,making these molecular features essential targets for therapeutic *** surgery is the standard treatment for localized GISTs,patients often experience relapse and disease progression even after *** recent years,targeted therapy has significantly improved the prognosis of patients with advanced *** mesylate,a KIT inhibitor,is the first-line treatment for advanced GISTs and has revolutionized the treatment of this ***,drug resistance remains a major issue with imatinib treatment,as a significant majority of patients become resistant to imatinib either after initiation or after 2–3 years of ***,novel tyrosine kinase inhibitors such as sunitinib,regorafenib,ripretinib,and avapritinib have been introduced to address drug *** has emerged as a potential approach for the treatment of advanced *** review comprehensively summarizes the pathogenesis of GISTs and the development of targeted therapies and immunotherapies,provides an overview of the emergence of drug resistance in advanced GISTs,and discusses the challenges and prospects associated with the treatment of GISTs.

关键词： Gastrointestinal stromal tumors Pathogenesis Systemic therapy Drug resistance

深埋隧洞地下水分层水力联系地表深孔监测技术与工程应用

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清华大学学报（自然科学版） 2024年第7期64卷 1226-1237页

作者：陈念张强汪小刚王玉杰王鹏王丹中国水利水电科学研究院流域水循环模拟与调控国家重点实验室北京100048 云南省滇中引水工程有限公司昆明650000

外水压力是深埋隧洞建设中面临的一个关键问题,由于深埋隧洞埋深大、地下水位高、地层间水力联系规律复杂,因此给深埋隧洞外水压力确定提出巨大挑战。厘清隧洞全生命周期地下水的水力联系规律,是准确评价深埋隧洞外水压力和隧洞建设影... 详细信息

外水压力是深埋隧洞建设中面临的一个关键问题,由于深埋隧洞埋深大、地下水位高、地层间水力联系规律复杂,因此给深埋隧洞外水压力确定提出巨大挑战。厘清隧洞全生命周期地下水的水力联系规律,是准确评价深埋隧洞外水压力和隧洞建设影响地下水环境的关键。该文采用数值模拟法研究不同地层类型对隧洞开挖后地下水演化规律的影响,在此基础上,提出一种深埋隧洞地下水分层水力联系地表深孔监测技术,并应用于滇中引水工程蔡家村隧洞。数值模拟结果显示:隧洞上方存在隔水地层对开挖后地下水水力联系有显著影响。工程实践应用不仅验证了该技术的可行性,还证实了深埋隧洞地下水水力联系存在分层现象。该文提出的深埋隧洞地下水分层水力联系地表深孔监测技术为深埋隧洞高外水压力的取值研究提供了有效手段。

关键词：深埋隧洞外水压力隔水地层分层水力联系地表深孔数值模拟

乡村振兴背景下“认购碳汇”司法功能定位与路径优化

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农业经济问题 2024年第6期 132-144页

作者：王小钢刘启源天津大学法学院天津300072

“认购碳汇”司法创新既助益于修复生态环境损害,也助力于实现“双碳”目标和乡村振兴。当下“认购碳汇”司法实践成绩显著,但也因过度扩张替代性修复概念外延而使“认购碳汇”司法功能定位模糊不清。在生态环境恢复目标理念观照下,替... 详细信息

“认购碳汇”司法创新既助益于修复生态环境损害,也助力于实现“双碳”目标和乡村振兴。当下“认购碳汇”司法实践成绩显著,但也因过度扩张替代性修复概念外延而使“认购碳汇”司法功能定位模糊不清。在生态环境恢复目标理念观照下,替代性修复所提供的生态环境及其服务功能与受到损害的生态环境及其服务功能理应具有相当程度的等值替代性与地理关联性。为了全面推进乡村振兴,法院应区分“认购碳汇”替代履行生态环境损害赔偿责任与替代性修复生态环境损害这两种功能定位,并在此基础上优化“认购碳汇”司法适用路径。

关键词：乡村振兴认购碳汇替代履行替代性修复双碳

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一种高超声速飞行器固定时间滑模控制方法

宇航学报 2024年第4期45卷 560-570页

作者：许玉龙鄂斌王小刚崔乃刚哈尔滨工业大学航天学院哈尔滨150001

针对高超声速飞行器再入滑翔段的姿态控制问题,提出了一种存在外部扰动、模型不确定和输入饱和约束情况下的固定时间收敛终端滑模控制器。首先,针对固定时间收敛的超螺旋二阶滑模扰动观测器,给出了一个更加精确的固定收敛时间上界。随后... 详细信息

针对高超声速飞行器再入滑翔段的姿态控制问题,提出了一种存在外部扰动、模型不确定和输入饱和约束情况下的固定时间收敛终端滑模控制器。首先,针对固定时间收敛的超螺旋二阶滑模扰动观测器,给出了一个更加精确的固定收敛时间上界。随后,构造了一种改进的变指数系数快速非奇异多变量终端滑模面。进而,基于固定时间观测器和改进的滑模面,提出了一种可以使高超声速飞行器模型在受到外部扰动、模型存在不确定参数和输入饱和约束的情况下,能够实现固定时间收敛的再入滑翔段姿态控制终端滑模控制器,并证明了其在观测器收敛前后的固定时间稳定性。该方法能够在不引入额外测量的前提下,有效避免输入饱和。最后,通过数值仿真验证了所提出的控制方法的有效性。

关键词：高超声速飞行器滑翔再入姿态控制固定时间控制滑模控制

重症监护病房中合并恶性肿瘤的高龄脓毒症患者短期病死率研究

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中华老年医学杂志 2024年第6期43卷 721-726页

作者：王小刚刘韬滔苏州大学附属第二医院急诊与危重症医学科苏州215004 北京医院重症医学科国家老年医学中心中国医学科学院老年医学研究院北京100730

目的:分析恶性肿瘤是否为重症监护病房(ICU)中高龄脓毒症患者短期病死率的独立危险因素,探索该类患者序贯器官衰竭评估(SOFA)评分与短期病死率的剂量反应关系。方法:回顾性分析2008—2019年重症监护医疗信息市场(MIMIC-Ⅳ)数据库中80岁... 详细信息

目的:分析恶性肿瘤是否为重症监护病房(ICU)中高龄脓毒症患者短期病死率的独立危险因素,探索该类患者序贯器官衰竭评估(SOFA)评分与短期病死率的剂量反应关系。方法:回顾性分析2008—2019年重症监护医疗信息市场(MIMIC-Ⅳ)数据库中80岁及以上高龄脓毒症患者资料,根据患者是否合并恶性肿瘤分为肿瘤组与非肿瘤组,比较两组患者基线数据及预后。根据患者入ICU后28 d生存情况分为存活组和死亡组,比较两组患者基线数据,采用Logistic回归分析短期病死率的危险因素。采用概率单位回归拟合SOFA评分与短期病死率的剂量反应关系。结果:共筛选53150份医疗记录,纳入5126例80岁及以上高龄脓毒症患者,其中754例合并恶性肿瘤,264例为转移性肿瘤。肿瘤组患者28 d病死率显著高于非肿瘤组[26.79%(202/754)比18.85%(824/4372),χ^(2)=24.85,P<0.001]。短期病死率的Logistic回归分析结果显示,年龄(OR=1.073、95%CI:1.040~1.108,P<0.001)、除肿瘤外的查尔森合并症指数(CCI)(OR=1.134、95%CI:1.067~1.205,P<0.001)、入ICU血乳酸(OR=1.111、95%CI:1.048~1.179,P<0.001)、机械通气(OR=1.603、95%CI:1.176~2.187,P=0.003)、SOFA评分(OR=1.227、95%CI:1.182~1.273,P<0.001)是短期病死率的危险因素,CCI(OR=0.957、95%CI:0.867~1.057,P=0.380)、使用血管活性药物(OR=1.370、95%CI:0.902~2.081,P=0.140)、合并恶性肿瘤(OR=1.131、95%CI:0.449~2.848、P=0.794)及恶性肿瘤转移(OR=1.799、95%CI:0.930~3.477,P=0.081)则与短期病死率无相关性。剂量反应曲线结果显示,随着SOFA评分的增加,患者的28 d病死率增加,且SOFA评分达到11分时预期病死率达到50%,SOFA评分达到20分时预期病死率超过80%。结论:恶性肿瘤和肿瘤转移均不是ICU中高龄脓毒症患者短期病死率的独立危险因素,该类患者短期病死率与SOFA评分呈剂量反应关系。

关键词：重症监护病房肿瘤脓毒症死亡率

Prediction of soil organic carbon stock combining Sentinel-1 and Sentinel-2 images in the Zoige Plateau, the northeastern Qinghai-Tibet Plateau

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Ecological Processes 2024年第2期 165-176页

作者： Junjie Lei Changli Zeng Lv Zhang xiaogang wang Chanhua Ma Tao Zhou Benjamin Laffitte Ke Luo Zhihan Yang Xiaolu Tang State Key Laboratory of Geohazard Prevention and Geoenvironment Protection Chengdu University of Technology Sichuan Academy of Geological Survey Sichuan Institute of Nuclear Geological Survey College of Earth Sciences Chengdu University of Technology Tianfu Yongxing Laboratory

Background Soil organic carbon（SOC） is a critical component of the global carbon cycle, and an accurate estimate of regional SOC stock（SOCS） would significantly improve our understanding of SOC sequestration and cycles. Zoige Plateau, locating in the northeastern Qinghai-Tibet Plateau, has the largest alpine marsh wetland worldwide and exhibits a high sensitivity to climate fluctuations. Despite an increasing use of optical remote sensing in predicting regional SOCS, optical remote sensing has obvious limitations in the Zoige Plateau due to highly cloudy weather, and knowledge of on the spatial patterns of SOCS is limited. Therefore, in the current study, the spatial distributions of SOCS within 100 cm were predicted using an XGBoost model—a machine learning approach, by integrating Sentinel-1, Sentinel-2 and field observations in the Zoige *** The results showed that SOC content exhibited vertical distribution patterns within 100 cm, with the highest SOC content in topsoil. The tenfold cross-validation approach showed that XGBoost model satisfactorily predicted the spatial patterns of SOCS with a model efficiency of 0.59 and a root mean standard error of 95.2 Mg ha-1. Predicted SOCS showed a distinct spatial heterogeneity in the Zoige Plateau, with an average of 355.7 ± 123.1 Mg ha-1within 100 cm and totaled 0.27 × 10～9 Mg *** High SOC content in topsoil highlights the high risks of significant carbon loss from topsoil due to human activities in the Zoige Plateau. Combining Sentinel-1 and Sentinel-2 satisfactorily predicted SOCS using the XGBoost model, which demonstrates the importance of selecting modeling approaches and satellite images to improve efficiency in predicting SOCS distribution at a fine spatial resolution of 10 m. Furthermore, the study emphasizes the potential of radar（Sentinel-1） in developing SOCS mapping, with the newly developed fine-resolution mapping having important applications in land management, ecological resto

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