检索结果-南通市图书馆

Typical synergistic effect of graphite nanoplatelets and carbon nanotubes and its influence on polymer-based dielectric composites

在线全文

学校读者我要写书评

暂无评论

High Voltage 2016年第4期1卷 140-145页

作者： Hang zhao Minhao Yang delong He Yu Liu Jintao Bai Hui Wang Haowei Chen Jinbo Bai Laboratoire Mécanique des Sols Structures et MatériauxCNRS UMR 8579Ecole CentraleSupelecUniversitéParis SaclayGrande Voie des Vignes92290Chatenay-MalabryFrance State Key Lab Incubation Base of Photoelectric Technology and Functional Materials International Collaborative Center on Photoelectric Technology and Nano Functional MaterialsNorthwest UniversityXi’an 710069People’s Republic of China

Graphite nanoplatelets(GNPs)with their intrinsic two-dimensional structure make an excellent compromise of advantages of both graphite and *** to their outstanding inherent properties,GNPs have been widely used as the functional fillers to improve certain performances of polymer-based ***,the multi-layer stacked construction of GNPs could form aggregations easily,which limits their application in polymer-based dielectric ***,the authors exhibit a polydimethylsilicone(PDMS)-based nanocomposite which loading equivalent carbon nanotubes(CNTs)and GNPs as co-loading fillers,whose dielectric properties are improved *** composites were fabricated through a highly-shearing mechanical mixing *** the mixing process,both intrinsic CNTs entanglements and GNPs stacked aggregation could be ameliorated due to the interaction between these two types of *** with the GNPs solely loaded composites,a small quantity of CNTs addition endows GNPs/CNTs/PDMS ternary composites with a significantly decreased percolation threshold(f_(c)∼1.7 vol.%).Both GNPs and CNTs,these two representative conductive carbon constructions with high aspect ratios are able to effectively enhance the establishing efficiency of internal conductive network inner *** results indicate that the development of internal conductive network and dielectric performance of nanocomposites are able to be optimised through the strategy of taking advantage of the synergistic effect of multi-type fillers reasonably.

关键词： composites dielectric carbon

Comparing 11 early warning scores and three shock indices in early sepsis prediction in the emergency department

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Emergency Medicine 2024年第4期15卷 273-282页

作者： Rex Pui Kin Lam Zonglin Dai Eric Ho Yin Lau Carrie Yuen Ting Ip Ho Ching Chan Lingyun zhao Tat ChiTsang Matthew Sik Hon Tsui Timothy Hudson Rainer Department of Emergency Medicine School of Clinical MedicineLi Ka Shing Faculty of Medicinethe University of Hong KongHong KongChina School of Public Health Li Ka Shing Faculty of Medicinethe University of Hong KongHong KongChina Accident and Emergency Department Queen Mary HospitalHong KongChina

BACKGROUND:This study aimed to evaluate the discriminatory performance of 11 vital sign-based early warning scores(EWSs)and three shock indices in early sepsis prediction in the emergency department(ED).METHODS:We performed a retrospective study on consecutive adult patients with an infection over 3 months in a public ED in Hong *** primary outcome was sepsis(Sepsis-3 definition)within 48 h of ED *** c-statistics and the delong test,we compared 11 EWSs,including the National Early Warning Score 2(NEWS2),Modified Early Warning Score,and Worthing Physiological Scoring System(WPS),etc.,and three shock indices(the shock index[SI],modified shock index[MSI],and diastolic shock index[DSI]),with Systemic Inflammatory Response Syndrome(SIRS)and quick Sequential Organ Failure Assessment(qSOFA)in predicting the primary outcome,intensive care unit admission,and mortality at different time ***:We analyzed 601 patients,of whom 166(27.6%)developed ***2 had the highest point estimate(area under the receiver operating characteristic curve[AUROC]0.75,95%CI 0.70-0.79)and was significantly better than SIRS,qSOFA,other EWSs and shock indices,except WPS,at predicting the primary ***,the pooled sensitivity and specificity of NEWS2≥5 for the prediction of sepsis were 0.45(95%CI 0.37-0.52)and 0.88(95%CI 0.85-0.91),*** discriminatory performance of all EWSs and shock indices declined when used to predict mortality at a more remote time ***:NEWS2 compared favorably with other EWSs and shock indices in early sepsis prediction but its low sensitivity at the usual cut-off point requires further modification for sepsis screening.

关键词： Sepsis Emergency department Clinical prediction rule Early warning score Shock index

东天山北克孜尔卡拉萨依二长花岗岩锆石U-Pb年代学、地球化学及地质意义

在线全文

学校读者我要写书评

暂无评论

矿产与地质 2020年第6期34卷 1112-1122页

作者：陈红旗焦建刚王祚鹏刘海生何碧尹高攀赵得龙甘肃省地质矿产勘查开发局第二地质矿产勘查院甘肃兰州730020 长安大学地球科学与资源学院/西部矿产资源与地质工程教育部重点实验室陕西西安710054 国土资源部岩浆作用成矿与找矿重点实验室陕西西安710054

东天山大南湖岛弧带分布有大量的中酸性侵入体,克孜尔卡拉萨依岩体位于大南湖岛弧带中部,岩石类型主要由二长花岗岩、正长花岗岩和花岗闪长岩组成,为同一期次岩浆产物。为厘定该岩体的形成时代及岩石成因,对其二长花岗岩进行了LA-ICP-M... 详细信息

东天山大南湖岛弧带分布有大量的中酸性侵入体,克孜尔卡拉萨依岩体位于大南湖岛弧带中部,岩石类型主要由二长花岗岩、正长花岗岩和花岗闪长岩组成,为同一期次岩浆产物。为厘定该岩体的形成时代及岩石成因,对其二长花岗岩进行了LA-ICP-MS锆石U-Pb年代学、主量元素、微量元素研究。结果表明:克孜尔卡拉萨依二长花岗岩成岩年龄为(372.3±2.5)Ma,属于晚泥盆世早期。岩石主量元素和微量元素测试结果显示:二长花岗岩具有高的SiO 2(70.68%~77.45%)、K 2 O+Na 2 O(6.72%~8.64%),低的Al 2 O 3(12.14%~17.45%)、MgO(0.12%~1.34%)、TiO 2(0.13%~0.41%)和Mg#(21.34~47.33),为高钾钙碱性系列;A/CNK值为0.96~1.42,显示准铝质到过铝质特征,属I型花岗岩;稀土含量较高,为55.93×10–6~186.71×10–6,平均值为111.27×10–6,(La/Yb)N=5.56~18.12,具有显著富集轻稀土而相对亏损重稀土的特征,负Eu异常(δEu为0.37~0.76)明显;富集Rb、Ba、U和K等大离子亲石元素,亏损Nb、Ta、P和Ti等高场强元素。结合区域构造演化,认为东天山北克孜尔卡拉萨依晚泥盆世花岗岩类主要与古天山洋向大南湖岛弧带之下俯冲导致的地壳物质的部分熔融有关。

关键词： I型花岗岩锆石U-Pb年代学地球化学晚泥盆世克孜尔卡拉萨依东天山

在线全文

学校读者我要写书评

暂无评论

非开挖水平定向钻行业分析与技术进展

地质装备 2024年第S1期25卷 1-9页

作者：赵志涛颜纯文贺云超张德龙徐军军北京探矿工程研究所北京100083 中国地质学会非开挖技术专业委员会北京100083

我国是水平定向钻装备的最大生产国,行业集中度较高,低端市场产品同质化严重,价格竞争较为激烈。随着我国地下管网里程和投入增加,水平定向钻进的发展也面临很多新的机遇和挑战。为此归纳分析了非开挖水平定向钻行业的发展形势,阐述了... 详细信息

我国是水平定向钻装备的最大生产国,行业集中度较高,低端市场产品同质化严重,价格竞争较为激烈。随着我国地下管网里程和投入增加,水平定向钻进的发展也面临很多新的机遇和挑战。为此归纳分析了非开挖水平定向钻行业的发展形势,阐述了钻机、钻头与钻杆等水平定向钻装备的现状,探讨了岩屑运移、孔壁稳定、钻柱力学、扩孔和回拖力计算等理论成果中的关键问题,论述了导孔轨迹控制、硬岩冲击钻进、大口径长距离水平定向钻进及管线探测技术等水平定向钻集成应用技术的主要进展,提出了继续开展安全、高效、精准的水平定向钻技术理论研究,进一步加强非开挖装备的迭代升级,以及设备供应商和工程承包商业务发展方向等方面的建议。

关键词：水平定向钻进行业分析技术进展大口径长距离

All-optical PtSe2 silicon photonic modulator with ultra-high stability

在线全文

学校读者我要写书评

暂无评论

Photonics Research 2020年第7期8卷 1189-1196页

作者： Kangkang Wei delong Li Zhitao Lin zhao Cheng Yuhan Yao Jia Guo Yunzheng Wang Yupeng Zhang Jianji Dong Han Zhang Xinliang Zhang Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China Institute of Microscale Optoelectronics Collaborative Innovation Centre for Optoelectronic Science&TechnologyKey Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong ProvinceCollege of Physics and Optoelectronic EngineeringShenzhen Key Laboratory of Micro-Nano Photonic Information TechnologyGuangdong Laboratory of Artificial Intelligence and Digital Economy(SZ)Shenzhen UniversityShenzhen 518060China

All-optical modulation based on the photothermal effect of two-dimensional(2 D)materials shows great promise for all-optical signal processing and *** this work,an all-optical modulator with a 2 D Pt Se2-onsilicon structure based on a microring resonator is proposed and demonstrated utilizing the photothermal effect of Pt Se2.A tuning efficiency of 0.0040 nm·m W-1 is achieved,and the 10%–90%rise and decay times are 304μs and 284μs,*** fabricated device exhibits a long-term air stability of more than 3 *** experimental results prove that 2 D Pt Se2 has great potential for optical modulation on a silicon photonic platform.

关键词： modulator optical tuning

Microstructural evolution of h-BN matrix composite ceramics with La-Al-Si-O glass phase during hot-pressed sintering

在线全文

学校读者我要写书评

暂无评论

Journal of Advanced Ceramics 2021年第3期10卷 493-501页

作者： Baofu QIU Xiaoming DUAN Zhuo ZHANG Chen zhao Bo NIU Peigang HE delong CAI Lei CHEN Zhihua YANG Yujin WANG Dechang JIA Yu ZHOU Key Laboratory of Advanced Structural-Functional Integration Materials&Green Manufacturing Technology Harbin Institute of TechnologyHarbin 150001China Institute for Advanced Ceramics School of Materials Science and EngineeringHarbin Institute of TechnologyHarbin 150001China State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

BN/La-Al-Si-O composite ceramics were fabricated by hot-pressed sintering using hexagonal boron nitride(h-BN),lanthanum oxide(La_(2)O_(3)),aluminia(Al_(2)O_(3)),and amorphous silica(SiO_(2))as the raw *** effects of sintering temperature on microstructural evolution,bulk density,apparent porosity,and mechanical properties of the h-BN composite ceramics were *** results indicated that La-Al-Si-O liquid phase was formed during sintering process,which provided an environment for the growth of h-BN *** increasing sintering temperature,the cristobalite phase precipitation and h-BN grain growth occurred at the same time,which had a significant influence on the densification and mechanical properties of h-BN composite *** best mechanical properties of BN/La-Al-Si-O composite ceramics were obtained under the sintering temperature of 1700℃.The elastic modulus,flexural strength,and fracture toughness were 80.5 GPa,266.4 MPa,and 3.25 MPa·m^(1/2),respectively.

关键词： h-BN matrix composite ceramics La-A1-Si-O glass phase microstructural evolution nanocrystalline precipitation mechanical properties

改性防护蜡对轮胎胎侧胶性能的影响及蜡膜表征

在线全文

学校读者我要写书评

暂无评论

橡胶科技 2024年第6期22卷 323-328页

作者：赵红霞董瑞国马德龙崔亭亭李云峰山东阳谷华泰化工股份有限公司山东阳谷252300 国家橡胶助剂工程技术研究中心山东阳谷252300

研究不同类型防护蜡在半钢子午线轮胎胎侧胶中的应用性能以及蜡膜的表征方法。结果表明:添加不同类型防护蜡的胶料硫化特性及物理性能差异较小,选用不同类型防护蜡对轮胎的使用性能基本无影响;通过表面喷霜以及蜡膜分析得出,改性防护蜡... 详细信息

研究不同类型防护蜡在半钢子午线轮胎胎侧胶中的应用性能以及蜡膜的表征方法。结果表明:添加不同类型防护蜡的胶料硫化特性及物理性能差异较小,选用不同类型防护蜡对轮胎的使用性能基本无影响;通过表面喷霜以及蜡膜分析得出,改性防护蜡在橡胶表面形成的蜡膜薄而致密、结晶尺寸小,对橡胶的防护效果极佳,有效提升了轮胎的外观质量。

关键词：防护蜡物理性能防护效果天候老化喷霜晶型蜡膜

维普期刊数据库博看期刊

在线全文

学校读者我要写书评

暂无评论

西北太平洋公海远东拟沙丁鱼渔业生物学特征

海洋渔业 2024年第1期46卷 20-31页

作者：杨超赵国庆韩海斌张衡商宸苏冰刘思源蒋佩雯相德龙罗民波上海海洋大学海洋科学学院上海201306 青岛海洋科学与技术试点国家实验室山东青岛266071 中国水产科学研究院东海水产研究所农业农村部远洋与极地渔业创新重点实验室上海200090 大连海洋大学船舶与工程学院辽宁大连116000 安徽师范大学生态与环境学院安徽芜湖241000

为了解西北太平洋远东拟沙丁鱼(Sardinops sagax)的渔业生物学特征,基于2020年4-12月、2021年4-11月在西北太平洋公海采集的样品(共2664尾),对其群体结构、性腺成熟度、初次性成熟叉长、摄食等级和肥满度进行了研究。结果表明,远东拟沙... 详细信息

为了解西北太平洋远东拟沙丁鱼(Sardinops sagax)的渔业生物学特征,基于2020年4-12月、2021年4-11月在西北太平洋公海采集的样品(共2664尾),对其群体结构、性腺成熟度、初次性成熟叉长、摄食等级和肥满度进行了研究。结果表明,远东拟沙丁鱼叉长范围为85~240 mm,优势叉长组为160~200 mm,不同性别的个体叉长差异不显著(P>0.05);体质量范围为5.6~144.6 g,优势体质量组为35~75 g,不同性别个体的体质量差异不显著(P>0.05);年龄组成为0^(+)~6^(+),优势年龄组为1^(+)~3^(+)。叉长与体质量关系符合幂函数指数方程,生长参数b=3.1538,符合正向异速生长。性成熟度以Ⅱ期为主(占比90%以上),叉长组95~104 mm与105~114 mm的鱼体性腺成熟度差异极显著(P<0.01),叉长组205~224 mm与225~245 mm的性成熟差异显著(P<0.05);初次性成熟叉长(L_(50))为178.1 mm。摄食强度以0~2级为主,不同叉长组的摄食强度差异显著(P<0.05)。鱼体肥满度系数范围为0.82~1.42,肥满度随着叉长增加先升高再降低,在叉长组135~164 mm时肥满度系数最高,不同月份之间肥满度系数有所不同,10月其个体肥满度系数达到最高值1.25。研究结果丰富了西北太平洋远东拟沙丁鱼生物学特征资料,可为其种群鉴定、生活史研究、资源开发和合理利用等提供基础和重要依据。

关键词：西北太平洋远东拟沙丁鱼生物学特征

Mouse macrophage specific knockout of SIRT1 influences macrophage polarization and promotes angiotensin Ⅱ-induced abdominal aortic aneurysm formation

在线全文

学校读者我要写书评

暂无评论

Journal of Genetics and Genomics 2018年第1期45卷 25-32页

作者： Zhuqin Zhang Jing Xu Yue Liu Tingting Wang Jianfei Pei Liqin Cheng delong Hao Xiang zhao Hou-Zao Chen De-Pei Liu State Key Laboratory of Medical Molecular Biology Department of Biochemistry and Molecular Biology Institute of Basic Medical Sciences Chinese Academy of Medical Sciences Peking Union Medical College No.5 Dong Dan San Tiao Beijing 100005 China

Abdominal aortic aneurysm （AAA） is a vascular degenerative disease. Macrophage polarization and the balance between classically activated macrophages （M1） and alternatively activated macrophages （M2） are crucial for AAA pathogenesis. The present study aims to investigate the roles of macrophage SIRTI in AAA formation and macrophage polarization. We found that in mouse peritoneal macrophages, SIRT1 expression was decreased after M1 stimulation, but was enhanced after M2 stimulation. Results from SIRT1flox/flox mice and macrophage specific SIRT1 knockout mice with treatment of angiotensin II （Ang 11） for 4 weeks showed that macropbage specific deficiency of SIRT1 increased the incidence of AAA and exacerbated the severity, including more severe aneurysm types, enlarged diameter of the aneurysm and increased degradation of elastin. In mouse aortas, SIRT1 deficiency increased the pro- inflammatory M1 molecule inducible nitric oxide synthase （iNOS）, and decreased M2 molecules such as arginase 1 （Argl） and mannose receptor （MR）. Furthermore, in peritoneal macrophages, SIRT1 deficiency increased the expression of M1 inflammatory molecules, but decreased the expression of M2 molecules. Overexpression of SIRT1 had the opposite effects. Thus, macrophage specific knockout of SIRT1 influences macrophage polarization and accelerates Ang II-induced AAA formation.

关键词： SIRT1 Inflammation Macrophage polarization Abdominal aortic aneurysm