检索结果-南通市图书馆

Chinese Physics B 2012年第2期21卷 521-525页

作者： zhang hong-lin Hu Bin-Jie zhang Xiu-Yin School of Electronic and Information Engineering South China University of TechnologyGuangzhou 510640China

A compact and broadband circularly polarized （CP） annular ring antenna with wide beam-width is proposed for multiple global navigation satellite systems （GNSS） in the L1 band. The annular ring is excited by two modified L-probes with quadrature phase difference. It has a 36.3% 10-dB return loss bandwidth and a 13% 3-dB axial ratio bandwidth, because of the orthogonal L-probes with 90° phase difference. The measured peak gain of the antenna is 3.9 dBic. It can detect the satellites at lower elevation as its half power beam-width （HPBW） is 113° in both the x-z and y-z planes, achieving a cross-polarization level of larger than 25 dB. Noticeably, the antenna achieves 89% size reduction compared with the conventional half wavelength patch antennas. It can be used in hand-held navigation devices of multiple GNSS such as COMPASS, Galileo, GPS and GLONASS.

关键词： global navigation satellite system annular ring antenna circular polarization wide beam-width

Transformation of Structure and Properties of Vesicles Induced by Transition Metal Ions

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2005年第12期16卷 1667-1670页

作者： hong Tao GUO Fei XU Xiao Hai ZHOU Jin Feng DONG Gao Yong zhang Xin lin hong College of Chemistry and Molecular Sciences Wuhan University Wuhan 430072

This paper proved that octodecyl propylenediamine could form vesicles in pure water and aqueous solution of CuCl2 or Cu（NO3）2. The structure and morphology of vesicles were different when the copper （Ⅱ） salt was added to the solution. The results showed that both the counterions and the ligands had strong influence on the configuration of coordinated structures and packing model in bilayer membrane of vesicles.

关键词： Octodecyl propylenediamine copper (Ⅱ) ions vesicle bilayer membrane counterions coordinated structure

Research on Crystal Orientation Evolvement of Continuously Unidirectionally Solidified Copper Rods during Working Process

在线全文

学校读者我要写书评

暂无评论

稀有金属材料与工程 2011年第S3期40卷 216-219页

作者： zhang hong, Wang Zidong, lin Guobiao, Chen Mingwen, Wang Shigang, Yuan Baolong University of Science and Technology Beijing, Beijing 100083, China Univ Sci & Technol Beijing Beijing 100083 Peoples R China

Copper rods with diameter of 17.0 mm have been fabricated by Continuous Unidirectional Solidification (CUS) process. The metallographic results show that the microstructures of the rods are longitudinal columnar crystals and the crystal sizes range roughly among 100-200 μm. The copper rod can be worked to ultra-fine wires 19.7 μm diameter at room temperature without any heat treatments, and the size of the microstructure of the wires obtains nanometer scale. During working process, the elongation multiple of the rod is as high as 740 000 and total deformation true strain over 13.5. The copper rod containing continuous columnar crystals has exhibited excellent cold elongation deformation ability. The results of the texture tests show that the rod has strong fiber texture. After worked at room temperature, texture variants of strong and less strong evolve in the copper wires. With increasing deformation level, the contour of fiber texture decreases while increases. The excellent cold elongation deformation ability and high strength of copper wires is considered to be a result of the strong fiber texture, work hardening and a small quantity of

关键词： copper continuous unidirectional solidification texture microstructure deformation

Flexible Graphene Field‑Effect Transistors and Their Application in Flexible Biomedical Sensing

在线全文

学校读者我要写书评

暂无评论

Nano-Micro Letters 2025年第2期17卷 252-313页

作者： Mingyuan Sun Shuai Wang Yanbo Liang Chao Wang Yunhong zhang hong Liu Yu zhang lin Han Institute of Marine Science and Technology Shandong UniversityQingdao 266237ShandongPeople’s Republic of China State Key Laboratory of Crystal Materials Shandong UniversityJinan 250100ShandongPeople’s Republic of China School of Integrated Circuits Shandong UniversityJinan 250100ShandongPeople’s Republic of China Shandong Engineering Research Center of Biomarker and Artificial Intelligence Application Jinan250100ShandongPeople’s Republic of China

Flexible electronics are transforming our lives by making daily activities more *** to this innovation are field-effect transistors(FETs),valued for their efficient signal processing,nanoscale fabrication,low-power consumption,fast response times,and ***,known for its exceptional mechanical properties,high electron mobility,and biocompatibility,is an ideal material for FET channels and *** combination of graphene and FETs has given rise to flexible graphene field-effect transistors(FGFETs),driving significant advances in flexible electronics and sparked a strong interest in flexible biomedical ***,we first provide a brief overview of the basic structure,operating mechanism,and evaluation parameters of FGFETs,and delve into their material selection and patterning *** ability of FGFETs to sense strains and biomolecular charges opens up diverse application *** specifically analyze the latest strategies for integrating FGFETs into wearable and implantable flexible biomedical sensors,focusing on the key aspects of constructing high-quality flexible biomedical ***,we discuss the current challenges and prospects of FGFETs and their applications in biomedical *** review will provide valuable insights and inspiration for ongoing research to improve the quality of FGFETs and broaden their application prospects in flexible biomedical sensing.

关键词： Flexible Graphene Field-effect transistor Wearable Implantable Biosensor

在线全文

学校读者我要写书评

暂无评论

侵蚀燃烧在发射装药内弹道中的应用研究

兵工学报 2008年第2期29卷 129-133页

作者：张洪林南京理工大学化工学院

侵蚀燃烧是具有内孔燃烧火药的一种普遍现象,应用侵蚀燃烧可改变火药燃烧的规律。由于火炮发射装药装填密度的变化,不同装填密度发射药所受的内孔与外部压力也不同,这种压力差使发射药内孔在火炮膛内燃烧时发生侵蚀燃烧。利用发射药内... 详细信息

侵蚀燃烧是具有内孔燃烧火药的一种普遍现象,应用侵蚀燃烧可改变火药燃烧的规律。由于火炮发射装药装填密度的变化,不同装填密度发射药所受的内孔与外部压力也不同,这种压力差使发射药内孔在火炮膛内燃烧时发生侵蚀燃烧。利用发射药内孔燃气流动的流速、传热和冲刷对燃速的影响,研究了火炮发射装药的侵蚀燃烧对发射药燃速的影响,建立了发射装药侵蚀燃烧数学模型,分析了发射药装填密度、内孔的孔径、药粒长度等变化所引起的侵蚀燃烧变化及对发射装药内弹道性能的影响。提出了在变装药中,利用侵蚀燃烧提高小装药量、小射程用发射装药膛压的方法。

关键词：航空航天科学技术基础学科发射装药侵蚀燃烧数学模型应用

A follow-up study of women with a history of severe preeclampsia： relationship between metabolic syndrome and preeclampsia

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2011年第5期124卷 775-779页

作者： LU Jie ZHAO Yang-yu QIAO Jie zhang hong-jun GE lin WEI Yuan Department of Gynecology & Obstetrics Peking University Third Hospital Beijing 100191 China

Background Women with a history of preeclampsia have twice the risk of cardiovascular diseases, and there is a graded relationship between the severity of preeclampsia and the risk of cardiac disease. Moreover, metabolic scores are associated with developing preeclampsia. However, since there are no diagnostic criteria for metabolic syndrome during pregnancy and pregnant women undergo metabolic changes, it is difficult to elucidate the relationship between preeclampsia and metabolic syndrome. We carried out a cross-sectional study to investigate the relationship between metabolic syndrome and preeclampsia among women with a history of severe preeclampsia shortly after an indexed *** We recruited 62 women with a history of severe preeclampsia 1 to 3 years after an indexed pregnancy. Blood pressure and body compositional indices were recorded. Fasting blood samples were tested for glucose, total cholesterol high density lipoprotein-cholesterol, low density lipoprotein-cholesterol, triglycerides, and insulin. A questionnaire was used to collect demographic data including pre-pregnancy weight and family history of diseases associated with cardiovascular diseases. Criteria for metabolic syndrome were defined by the National Cholesterol Education Program, Adult Treatment Panel III 2001 （NCEP III） and International Diabetes Federation 2005 （IDF）. Data were analyzed by the （α2 test and multivariate Logistic *** According to NCEP III and IDF standards, 17 （27%） and 24 （39%） women, respectively, were identified as having metabolic syndrome. Being overweight pre-pregnancy and currently overweight were risk factors, and currently overweight was an independent risk factor. A combination of blood pressure and waist circumference was predictive of metabolic syndrome with a sensitivity of 91.67% and specificity of 94.74%. Conclusions An unfavorable metabolic constitution in women may lead to metabolic syndrome, preeclampsia, and long-term cardiovascular

关键词： metabolic syndrome severe preeclampsia cardiovascular disease

基于AVO属性体的含气指数反演在致密砂岩储层的应用

在线全文

学校读者我要写书评

暂无评论

物探化探计算技术 2016年第5期38卷 647-655页

作者：张红霖中国石化中原油田分公司物探研究院濮阳457001

川东北须家河组为一套砂泥岩互层的陆相碎屑岩沉积,砂岩极其发育,但物性差,属于特低孔低渗储层,此类砂岩储层含气后,纵横波速度、密度等弹性参数没有明显变化,地震波形等异常特征微弱,仅利用叠后地震属性不能有效地进行含气检测;此外,... 详细信息

川东北须家河组为一套砂泥岩互层的陆相碎屑岩沉积,砂岩极其发育,但物性差,属于特低孔低渗储层,此类砂岩储层含气后,纵横波速度、密度等弹性参数没有明显变化,地震波形等异常特征微弱,仅利用叠后地震属性不能有效地进行含气检测;此外,通过流体替换试验以及正演模拟证实了该区地层含气后所引起的AVO异常较为微弱,对含气区域的刻画能力也有限。根据钻、测井资料分析可知,该区砂岩储层含气之后会引起声波时差测井值一定程度的增大,中子明显下降,有较为明显的挖掘效应。因此,这里利用中子-声波测井曲线交汇重构含气指数曲线,在AVO属性体的基础上进行含气指数反演,突出AVO属性异常,增强了AVO属性对含气性的预测能力。

关键词： AVO反演流体替换正演模拟测井曲线重构含气检测致密砂岩

Synthesis and characterization of stable osmafuran starting from HC≡CCH(OH)C≡CH and OsHCl(CO)(PPh_3)_3

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2010年第9期53卷 1978-1981页

作者： zhang hong,lin Ran,LUO Ming & XIA HaiPing State Key Laboratory for Physical Chemistry of Solid Surfaces College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,China 1. State Key Laboratory for Physical Chemistry of Solid Surfaces College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China

This paper presents a new convenient route to prepare osmafuran starting from readily accessible HC≡C CH(OH)C≡CH and OsHCl(CO)(PPh3)*** of a solution of OsHCl(CO)(PPh3)3 in dichloromethane with HC≡C CH(OH)C≡CH,followed by the addition of acetic acid,produced osmafuran [Os(CHC(PPh3)CO(CH2CH3))Cl(CO)(PPh3)2]Cl(2).2 has been isolated in good yield and fully characterized.1H and 13C NMR spectra show the characteristic downfield chemical shifts of the ring hydrogen and carbon *** and X-ray diffraction data provide strong evidence for the aromatic nature of *** due to the effect of the phosphonium substituent,2 exhibits remarkable thermal stability,air stability and lower reactivity.

关键词： osmafuran metallaaromatics phosphonium salt synthesis stability

在线全文

学校读者我要写书评

暂无评论

论赌博罪的完善——法经济学的视角

河北法学 2007年第8期25卷 76-79页

作者：张林鸿中南财经政法大学法学院湖北武汉430060

我国刑法已明确地将赌博作为一种犯罪进行处罚。但由于我国法律没有很好地考虑刑罚的效率性和经济性,在赌博犯罪立法上还存在着一定的缺陷和漏洞。通过法经济学方法,对赌博犯罪立法的正当性和效率性进行分析,提出完善我国赌博犯罪立法... 详细信息

我国刑法已明确地将赌博作为一种犯罪进行处罚。但由于我国法律没有很好地考虑刑罚的效率性和经济性,在赌博犯罪立法上还存在着一定的缺陷和漏洞。通过法经济学方法,对赌博犯罪立法的正当性和效率性进行分析,提出完善我国赌博犯罪立法的建议。

关键词：赌博罪法经济学刑罚成本

在线全文

学校读者我要写书评

暂无评论

清代四川井盐引岸法制的运行

现代法学 2011年第6期33卷 37-46页

作者：张洪林华南理工大学法学院广东广州510640

清代盐法施行的是纲盐法,纲盐法的基本建制是引岸制度,为了施行引岸制度,建立了一套较为完备的法制,但这一法制在不同盐区的具体运行又存在着较大的差别。本文将研究引岸法制在四川井盐中食盐销区的划分、运销中的官督商销法和官运商销... 详细信息

清代盐法施行的是纲盐法,纲盐法的基本建制是引岸制度,为了施行引岸制度,建立了一套较为完备的法制,但这一法制在不同盐区的具体运行又存在着较大的差别。本文将研究引岸法制在四川井盐中食盐销区的划分、运销中的官督商销法和官运商销法的具体运行,从而剖析引岸法制在四川的施行对国家和地方税收的保障、民众的就业与食盐秩序的稳定、榷盐对商品经济的发展和官吏的腐败所产生的影响,并提出清代盐法对食盐进行法律规制,对民众生活必需品的保障和维护社会基本秩序的稳定是有借鉴意义的。

关键词：清代四川井盐引岸制运行