Search

为积极响应国家走绿色可持续发展道路的号召，北京冬奥会采用了大量支承架体用于临时看台或舞台的搭建。为研究赛后的临时看台支承架体能否安全合理地被再次使用，以索氏不锈钢插销式节点临时看台支承架体为研究对象，设计并制作了一个横纵均为2跨且跨度为2 m的足尺模型试件，共进行了两次试验，即在首次水平加载试验结束后，将该试验架体搭建在室外，经历长时间严寒风雪后再重复做一次试验，重点对比分析了其在4种不同恒载与水平荷载组合作用下的整体结构变形模式、力学性能及典型位置峰值应变等。研究结果表明：在恒载为0.0 kN∙m-2、0.5 kN∙m-2、2.0 kN∙m-2和3.5 kN∙m-2的工况下，两次试验中架体结构的试验现象及变形模式基本相同，力学性能差值在5%以内，典型位置处峰值应变差值在10%以内，累计损伤较小。两次试验结束后结构均未出现明显损伤，仍具有较大安全储备，所以在经历长时间的严寒风雪后，临时看台支承架体仍可以被重复使用。研究结果可为北京冬奥会临时设施架体的赛后利用等研究提供参考。

为解决刚接柱脚自复位装配式钢框架结构在中震或大震下底层柱可能发生较大的塑性变形的问题，设计一种半刚接柱脚自复位装配式钢框架结构。对其子结构进行拟动力试验，对比框架在Taft地震波、LOS000地震波和El-Centro地震波输入及不同等级地震下的节点开口、耗能能力、刚度退化、预应力损失和应变变化。试验结果表明，钢框架在大震作用下具有良好的自复位功能和耗能能力。钢绞线平均预应力损失最多仅为1.58%，说明施加预应力的方法是可靠的。钢框架柱脚能够始终保持弹性状态，因此震后仅需修复钢梁，大大降低了修复成本。

为解决钢管混凝土柱与柱连接节点现场焊接带来的污染严重、建设效率低等问题，融合十字形芯筒方便加工和施工的优点，在课题组提出的自攻螺栓芯筒式柱节点基础上，提出一种新型连接节点，即内置十字形芯筒方钢管混凝土柱全螺栓装配式连接节点。基于该连接节点拟静力试验结果，利用ABAQUS软件建立数值分析模型，验证模拟方法的可靠性，并针对自攻螺栓、加劲肋和十字形芯筒不同构造组合开展参数化分析。研究结果表明：数值分析结果与试验结果吻合较好，验证了数值分析方法的可靠性；自攻螺栓有效抑制了法兰板的翘曲变形和相对开口，使节点抗弯承载力平均提高19.94%，延缓了节点的刚度退化；加劲肋抑制了法兰板变形，使节点抗弯承载力平均提高3.70%，但增大了法兰板发生相对开口的可能；十字形芯筒有效抑制了法兰板的翘曲变形和柱壁局部鼓曲，提高了节点承载力和刚度，延缓刚度退化。总体来说，加劲肋对该节点抗弯承载力影响不大，且增大上下法兰板的相对开口。因此可将方钢管混凝土柱全螺栓装配节点优化为芯筒和自攻螺栓的组合形式，十字形芯筒与自攻螺栓和混凝土之间具有良好的协同工作机制，优化前后的节点均能实现“强节点、弱构件”的性能化设计目标，在工程应用中值得推荐使用。

为了适应装配式自复位空间钢框架的节点开口和框架整体膨胀效应，提出一种带滑动次梁构造的装配式自复位空间钢框架。采用ABAQUS软件对装配式自复位空间钢框架进行有限元数值模拟对比分析，并在数值模拟基础上完成了新型滑动次梁的可行性分析。结果表明：数值模拟结果在节点开口、滞回曲线、索力变化和应变等方面均与试验结果吻合良好，验证了采用有限元方法研究的可行性；新型滑动次梁的设计有效地放松了楼板对装配式自复位空间钢框架的约束作用，达到了新型滑动次梁与自复位节点同步开口的目标，顺利实现了开口-闭合机制。

实效性临床试验（pragmatic clinical trials，PCT）作为真实世界研究的重要构成，在临床研究设计中越来越受到关注和重视。然而，目前对PCT的理解和应用仍存在的一些误区。因此，本文首先从PCT的概念、研究策划与设计、研究目的、常见的设计类型和核心特征等方面进行阐述，使读者全面和正确地认识PCT。其次，本文详述了PCT的使用范围、基本的统计分析原则与各类型试验设计的分析要求。最后，本文明确了此类研究的报告规范。 Abstract: Pragmatic clinical trials (PCT), as a important component of real-world research, attracted more and more attention in clinical study design. However, there exists some confusions in understanding and application of PCT. Therefore, this article provided technical specifications of PCT in terms of the concept, study planning and design, purpose, design types and core features, to make readers have a comprehensive and correct understanding of PCT; in addition, the application scope, basic statistical analysis principles, analysis requirements for various types of study design, and the report standards of PCT were also elaborated.

为了分析水貂源致病性大肠杆菌对喹诺酮类药物耐药表型与耐药基因型相关性，采用KB药敏纸片法和PCR法分别检测临床分离的15株水貂源致病性大肠杆菌耐药性与耐药表型。结果表明，15株水貂源致病性大肠杆菌对恩诺沙星、诺氟沙星、氧氟沙星、环丙沙星耐药率为467%—267%，呈现多重耐药性；耐药基因gyrA、gyrB 、qnrA、pare、qnrB检出率为80%—100%，其他耐药基因检出率为7%—40%，呈现多种耐药基因型；恩诺沙星、诺氟沙星、氧氟沙星、环丙沙星耐药表型与耐药基因gyrA、gyrB 、qnrA、par的符合率为40%—553%，与其他耐药基因复合较低。说明临床分离的15株水貂源致病性大肠杆菌对喹诺酮类药物产生多重耐药性，携带多种耐药基因，呈现多种耐药基因型，恩诺沙星、诺氟沙星、氧氟沙星、环丙沙星耐药表型与耐药基因gyrA、gyrB 、qnrA、par具有一定相关性。

The errors of DST-17 stress meter were analyzed by using compared with standard sample.The experimental results indicated that the number of angles has little influence on the fluctuation of measurement errors,but the measurement errors decrease slightly and finally tend to be stable with the increase of the number of angles.However,the diameter of collimating tube has obvious influence on measurement error of residual stress.The measurement error and error fluctuation of 1 mm diameter collimating tube are large.The measurement error of 2 mm diameter collimating tube is basically the same as that of 3 mm diameter collimating tube.The measurement error of SDD detector is smaller than that of linear array detector.The type of detector has little effect on the error fluctuation.

提出一种新型外挂蒸压加气混凝土墙板(ALC墙板)连接节点——钢管锚滑移节点(NDR滑移节点),该节点在传统钢管锚节点基础上改进,安装简便且无需预埋件,便于标准化生产。设计了5层1/4缩尺带外挂墙板钢框架模拟地震振动台试验,将其与两种传统刚性连接节点——钢管锚节点和钩头螺栓节点进行对比,研究外挂墙板节点的破坏形式及传力模型。试验选用El-Centro波,地震动加速度峰值APG从0.14g到2.00g逐级增加,结果表明:随着APG的增大,NDR滑移节点外挂墙板在节点连接处未发生明显破坏,与其对应的传统连接节点外挂墙板在节点连接处出现贯穿裂缝,局部有混凝土碎块脱落;该新型连接节点外挂墙板在8度多遇、罕遇地震动及9度极罕遇地震动时能够与主体结构协同工作,具有随动性;节点通过预留长孔的方式,依靠连接件的滑移机制有效保护了墙板,避免连接处遭到严重破坏;在试验基础上对该节点进行力学分析并得出相应的理论公式,为节点的工程应用提供了设计参考依据。

为了鉴定乌苏里母貉腹泻性疾病病原，采集患腹泻母貉的肛拭子及粪便样品，通过胶体金试纸条、卵囊分离法、PCR法和细菌分离鉴定等方法对采集的病料进行病原检测。结果显示，犬瘟热病毒、细小病毒、冠状病毒抗原检测为阴性，分离鉴定的病原为钩口线虫和大肠杆菌，通过致病性试验验证其致病性，分离的大肠杆菌对小白鼠具有很强的致病性。引起貉腹泻的病原为钩口线虫和大肠杆菌混合感染，且分离的致病性大肠杆菌对头孢曲松、头孢噻呋、美罗培南、左氧氟沙星4种药物敏感，其他的药物具有不同的耐药性。为貉腹泻病的防控提供研究基础。

为研究重力-抗侧力可分钢框架体系的受力性能,以某个实际工程为建筑方案,利用ETABS和PKPM软件建立了15层的重力-抗侧力可分钢框架体系和刚接钢框架体系的结构模型,在地震作用下对2种体系进行弹性和弹塑性分析。经过对比分析后得到了以下结论:在用钢量基本相同的情况下,重力-抗侧力可分钢框架体系的抗侧刚度和结构性能与刚接钢框架体系的抗侧刚度和结构性能相近;重力-抗侧力可分钢框架体系的抗弯框架受力充分,塑性铰较少,能够更好地耗散地震能量;重力-抗侧力可分钢框架体系内侧梁柱的截面较小,能够有效解决钢结构建筑露梁露柱的问题;重力-抗侧力可分钢框架体系与刚接钢框架体系相比拥有大量的铰接节点,能够降低施工难度,大大缩短建设周期,具有更好的经济效益和社会效益。

区域能源互联网综合效益的评估涉及对多种因素之间复杂反馈关系的处理，而传统评价方法一般局限于某一方面，未能全方位评估区域能源互联网发展带来的综合效益。提出了一种基于系统动力学的区域能源互联网综合效益评价模型。首先分析了区域互联网的构建带来的经济、社会、资源和环境4个方面的效益及相关影响因素；其次分析归纳了各因素间关系和反馈机制，并以此为基础构建了基于系统动力学的区域能源互联网综合效益评价模型；最后以东南亚地区为案例进行了多场景仿真分析，结果表明该模型可实现区域能源互联网综合效益量化评价，为区域能源互联网的规划和发展研究提供工具。

在4个箱形柱拼接节点低周往复加载试验研究基础上,采用ABAQUS有限元软件对4个箱形柱拼接节点的低周往复试验进行模拟分析,得到了节点的承载力、力-位移滞回曲线、骨架曲线和刚度退化规律。对比数值模拟结果与试验结果表明:在滞回曲线、骨架曲线、刚度退化和应变变化方面,数值模拟结果与试验结果吻合较好,箱形柱内套筒式全螺栓拼接节点在保证与柱焊接拼接节点相近的节点力学性能基础上实现了钢框架竖向试件的高效连接和绿色建造。

针对提出的可恢复功能的装配式预应力钢框架结构体系,依据已完成的梁柱节点、框架试验和整体结构的分析结果,结合我国现行建筑抗震设计规范,提出了腹板摩擦耗能的可恢复功能的装配式预应力钢框架"多遇地震无开口、无损伤,设防地震开口耗能且主体结构无损伤、罕遇地震主体结构损伤较小且仍能正常使用"的性能化设计目标,同时提出了性能化设计准则和设计流程,并通过设计算例验证了该方法的可行性,证明了提出的装配式预应力钢框架的结构响应估算方法具有一定的可靠性。

【目的】探讨Guidezilla延长导管在复杂冠状动脉病变介入治疗中的安全性和有效性。【方法】回顾性 分析深圳市孙逸仙心血管医院2015年8月至2017年9月间复杂冠脉病变采用Guidezilla延长导管辅助进行经皮 冠状动脉介入治疗（PCI）的72例患者，观察手术成功率和并发症发生率，随访术后主要心脏不良事件发生率。 【结果】71例（98.6%）经Guidezilla延长导管辅助下成功冠脉支架植入， 1例支架脱载。慢性闭塞病变（CTO） 4例， 钙化病变44例，迂曲病变30例，严重成角病变15例。65例（90.3%）经桡动脉途径， 7例经股动脉途径。术中术后 无严重并发症，无死亡病例。术后1个月随访无不良心脏事件发生。【结论】对于介入治疗复杂冠脉病变，采用 Guidezilla延长导管辅助介入治疗安全有效。

光纤光栅位移传感器具有精度高、本质安全、体积小和易复用等特点,但受到敏感材料的局限,大量程光纤光栅位移传感器很难获得。针对该问题,提出并实现了一种大量程的光纤光栅位移传感器,其采用行星轮系与粘贴光纤光栅悬臂梁相结合的结构,通过变换减速比来获得各种大量程;利用有限元分析法对传感器悬臂梁材料和结构进行了优化设计,研究了不同量程时该类传感器的输出特性。结果显示,该传感器输出信号的波长漂移量与位移量有着很好的线性关系,最大量程可达2 000mm。

采用有限元方法对3个混合结构T形新型墙梁半刚接耗能节点的构造及受力性能进行了分析,并与试验结果进行了比较。揭示了新型全栓接半刚性节点弯矩-转角关系、承载力、延性、耗能能力等力学性能。分析结果表明:通过合理选择有限元分析数值模型,可较好地预测该新型节点的受力性能,为今后进行数值、试验和分析影响因素奠定了基础;通过拆换该节点的顶、底角钢来满足"中震可修"的抗震性能目标;解决了墙梁刚性节点施工中的困难,完全避免了现场焊接,具有低碳和环保的优点。

1994年北岭地震和1995年阪神地震后,大量钢结构梁柱节点发生了脆性破坏,采取构造措施使塑性铰外移从而保护梁端焊缝成为震后改进钢框架梁柱节点的主要思想。将加强型和削弱型两种方式相结合,采用钢框架梁柱加强与削弱并用节点,对其中2类3种钢框架梁端加强与翼缘削弱梁柱节点进行了大比例尺试验和有限元分析。研究结果表明,3种钢框架梁端加强与翼缘削弱梁柱节点均实现了塑性铰外移,保护了梁端焊缝,具有良好的塑性转动能力和耗能能力。研究成果为该2类节点用于工程实际提供了参考。

2011年4月24～5月15日,在黑龙江省岭峰自然保护区对春季兴安落叶松林鸟类群垂直结构进行了研究,共观察到鸟类36种,分属6目17科,非雀形目鸟类6科13种,雀形目鸟类11科23种。雀形目鸟类的种类最多,占总数的63.89%,这和我国北方地区鸟类组成相一致。研究结果显示大兴安岭春季兴安落叶松林中,鸟类垂直分层现象较为明显,林冠层和地面（或水面）鸟类多样性较高,而乔木层和灌木层鸟类丰富度较高;草本层鸟类较少。分析显示造成这种结果的原因不仅与鸟类的食物资源分布有关,而且与鸟类的求偶、领域以及防御行为具有密切关系。本研究结果为鸟类保护和森林管理提供了依据。

文章针对平行光束反射式光纤位移传感器存在接收光强与被测位移量间双值对应问题,提出在试件表面设置光敏元件指示试件移动范围的方法来解决双值问题;并提出了双光路结构传感器设计方案,以消除光源波动、反射面反射率差异等因素对测量结果的影响;设计了基于C8051F410/2单片机的信号检测硬件电路。

光子晶体光纤（PCF）是一种新型光纤,其结构和导光机理都与普通光纤不同,呈现出许多在传统光纤中难以实现的特性,并因此受到广泛关注。PCF具有的特殊的性质扩大了光纤的应用领域。利用PCF的某些特性,可以制作性能优良的传感器。文章首先介绍了PCF的基本概念和主要特性,然后介绍了PCF在传感方面的几种应用。

【目的】比较不同区域猪晶状体上皮细胞的基因表达在转录组水平上的差异。【方法】解剖显微镜下分离晶状体前囊膜, 将附着于其上的上皮细胞分为中央( 直径为 10.56 mm) 和周边两部分。分别提取两个样本的总 RNAs 并经 PCR 扩增, 以 Cy3 和 Cy5 分别标记扩增的中央与周边部分的 cDNA, 与含 7548 个基因的表达谱芯片杂交, 经图像分析, 生物信息学处理获得基因表达在转录水平差异的相关信息。【结果】中央与周边区域的猪晶状体上皮细胞在转录组水平共鉴定出952个有效表达的基因点, 其中差异表达基因 261 个, 以中央区域为参照, 周边上皮细胞 mRNA 上调 137 个, 下调 124 个。差异表达基因主要涉及的功能有: 细胞周期与凋亡、细胞骨架蛋白及细胞外基质、转录、细胞信号分子等。【结论】中央与周边区域猪晶状体上皮细胞基因表达在转录组水平上差异明显。这类差异呈明显的功能聚类。

On the basis of the molecular- field theory and thermodynamics of magnetic system, the relation between heat and magnetic entropy change of the regenerative room - temperature magnetic Ericsson refrigeration cycle was analyzed in our study. Moreover, the influence of the temperature of heat reservoir on the performance of ferromagnetic magnetic Ericsson refrigeration cycle was investigated. The numerical simulation for the magnetic refrigeration cycle with typical ferromagnetic material Gadolinium was conducted. The results show that there will be an important turn of the cycle performance near the Curie temperature. Whenever temperature is higher than Curie temperature, only the condition of occurs, otherwise, both conditions appear. In addition, the maximum of high- temperature heat reservoir increases with the increase of low- temperature heat reservoir. And for the same heat reservoir, the increase rate ofde-creases while magnetic field strength increases.

提出一种基于双包层光纤和耦合器的双包层光纤微弯传感器结构及暗场检测方法。通过理论和仿真分析,建立了双包层光纤弯曲损耗的理论模型;通过对光纤结构参数与传感器灵敏度关系的仿真,获得了实验用光纤最佳结构参数;理论和仿真分析了变形器的最佳周期、齿间距和齿数问题;对双包层光纤微弯传感器及其暗场检测方法进行了实验研究,结果显示,传感器输出光场与光纤形变之间有着较好的线性关系。

黑龙江省地处祖国东北部,地理位置为东经121°13′135°05′,北纬43°35′53°36′,土地面积达45.46万km2。黑龙江省幅员辽阔,生境多样,沼泽湖泊遍布全省,为水禽提供了良好的栖息、繁衍生境,是水禽的乐园。为开展生态旅游提供了良好的条件。

塑料光纤以其芯径大、柔韧性好、连接方便和耦合效率高等优点,为光纤到户（FTTH）接入问题提供了很好的解决方案。文章通过MATLAB对塑料光纤连接器中的光纤耦合效率问题进行了模拟仿真。提出了一种用于FTTH的实用塑料光纤连接器结构,该连接器具有连接损耗低、操作简单、安装方便和性价比高等特点。

三江平原地区位于中国东北角,地理座标N 43°49＇ 55＂～48°27＇ 40＂,E129°11` 20＂～135°05＇10＂,总面积为1.089×105km2.为中

Copyright of Journal of Food Safety & Quality is the property of Journal of Food Safety & Quality Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Objective: The aim of this study was using multimodality echocardiographic parameters to evaluate early changes in systolic and diastolic functions of left ventricle in patients with hypertrophic cardiomyopathy (HCM) . Methods: A total of 54 HCM patients were selected, including 34 with non ⁃ obstructive HCM patients and 20 with obstructive HCM patients, who visited the outpatient department of the First Affiliated Hospital of Nanjing Medical University from October 2019 to June 2021. Additionally, 30 healthy individuals were chosen as a control group. Multimodality echocardiographic parameters were used to compare the changes in left ventricular systolic and diastolic functions among three groups. Results: HCM patients exhibited reduced left ventricular systolic and diastolic function. Obstructive HCM patients showed more significant reduction in global longitudinal strain (GLS), global work index (GWI), global constructive work (GCW), and global work efficiency (GWE) . The difference in global waste work (GWW) among the three groups was not statistically significant. Conclusion: Multimodality echocardiographic parameters can comprehensively evaluate the early impairment of left ventricular systolic and diastolic functions in HCM patients, providing important basis for clinical diagnosis, treatment, and prognosis as early as possible. [ABSTRACT FROM AUTHOR]

Copyright of Electric Power Automation Equipment / Dianli Zidonghua Shebei is the property of Electric Power Automation Equipment Press and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Aesthetic & Plastic Surgery is the property of Chinese Journal of Aesthetic & Plastic Surgery Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Frontiers of Computer Science & Technology is the property of Beijing Journal of Computer Engineering & Applications Journal Co Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Shipin Kexue/ Food Science is the property of Food Science Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Shipin Kexue/ Food Science is the property of Food Science Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Continue Education Research is the property of Harbin Normal University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of e-Education Research is the property of Northwest Normal University and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Anhui Agricultural Sciences is the property of Journal of Anhui Agricultural Sciences Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Objective To explore and analyze the application value of patient demand-oriented refined nursing intervention in the perioperative period of interventional surgery for lower limb deep vein thrombosis. Methods A total of 79 patients with lower limb deep vein thrombosis who underwent interventional surgery in our hospital were selected from March 2023 to January 2024 and randomly divided into two groups by digital table method, including 39 cases in the control group (routine nursing intervention) and 40 cases in the observation group (demand-oriented refined nursing intervention). The intervention outcomes of the two groups were compared and analyzed. Results After intervention, compared with the control group, the observation group had higher compliance rate[97.50% (39/40) vs. 82.05% (32/39）],lower complication rate[2.50% (1/40) vs. 20.51% (8/39）],higher the World Health Organization Quality of Life Scale Short Form (WHOQOL-BREF) score and higher satisfaction[95.00% (38/40) vs. 76.92% (30/39）],and the differences were statistically significant (P＜0.05). Conclusion The application of demand-oriented refined nursing in the perioperative period of lower limb deep vein thrombosis intervention surgery is helpful to improve patient compliance, reduce perioperative complications, and improve their quality of life and satisfaction. [ABSTRACT FROM AUTHOR]

Copyright of Shipin Kexue/ Food Science is the property of Food Science Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)