检索结果-南通市图书馆

EMC design for actuators in the FAST reflector

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2018年第4期18卷 123-128页

作者： Hai-yan Zhang Ming-Chang Wu You-Ling Yue Heng-Qian Gan hao Hu Shi-Jie Huang National Astronomical Observatories Chinese Academy of Sciences Beijing 100101 China Key Laboratory of Radio Astronomy Chinese Academy of Sciences Nanjing 210034 China

An active reflector is one of the three main innovations incorporated in the Five-hundredmeter Aperture Spherical radio Telescope（FAST）.The deformation of such a huge spherically shaped reflector into different transient parabolic shapes is achieved by using 2225 hydraulic actuators which change the position of the 2225 nodes through the connected down tied *** each different tracking process of the telescope,more than 1/3 of these 2225 actuators must be in operation to tune the parabolic aperture accurately and meet the surface error *** means that some of these actuators are inevitably located within the main beam of the receiver,and Electromagnetic Interference（EMI）from the actuators must be mitigated to ensure the scientific output of the *** on the threshold level of interference detrimental to radio astronomy described in ITU-R Recommendation RA.769 and EMI measurements,the shielding efficiency（SE）requirement for each actuator is set to be 80 d B in the frequency range from 70 MHz to 3 ***,Electromagnetic Compatibility（EMC）was taken into account in the actuator design by measures such as power line filters,optical fibers,shielding enclosures and other structural *** 2015,all the actuators had been installed at the FAST *** now,no apparent EMI from the actuators has been detected by the receiver,which demonstrates the effectiveness of these EMC measures.

关键词： radio telescope — active reflector actuator — electromagnetic compatibility

1980—2020年郑州大都市区“三生”功能演化特征及其优化路径

在线全文

学校读者我要写书评

暂无评论

湖北农业科学 2024年第6期63卷 66-74,115页

作者：贾琦尹泽凯张超玉刘毅洁燕宏宇郑州轻工业大学艺术设计学院郑州450002 山东建筑大学艺术学院济南250101

研究聚焦郑州大都市区1980—2020年“三生”功能的演化特征,以土地利用分类数据为依据,采用GIS空间探索性分析法测度郑州大都市区“三生”功能特征,并分类提出优化调控策略。结果表明,郑州大都市区的生产和生态功能持续下降,以郑州主城... 详细信息

研究聚焦郑州大都市区1980—2020年“三生”功能的演化特征,以土地利用分类数据为依据,采用GIS空间探索性分析法测度郑州大都市区“三生”功能特征,并分类提出优化调控策略。结果表明,郑州大都市区的生产和生态功能持续下降,以郑州主城区为中心的生活功能则快速扩张;都市区生产功能持续东移,生活功能不断聚集在各地市建成区周边,生态功能集中在西部山区和黄河沿线,呈分散和破碎化趋势;郑州大都市区“三生”功能综合水平较高区域多位于由荥阳—新郑—中牟围合而成的区域,且不断向核心区域集聚,指标呈提升趋势。遵循提升复合型功能用地占比,适当扩大生活功能用地,集约利用生产功能用地并加强产城融合功能,科学布局“三生”功能的数量占比等原则,提出了“三生”功能在空间分配上的均衡性布局策略,以期促进郑州大都市区国土空间的可持续利用。

关键词： “三生”功能综合功能水平优化路径郑州大都市区

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

基于多属性融合的火山机构喷发演化规律研究

天然气与石油 2024年第4期42卷 63-72页

作者：崔名喆李超吴春新路研张立安中海石油(中国)有限公司天津分公司渤海石油研究院天津300459

渤海湾盆地渤中34-9油田常规砂岩油藏贯穿火山机构内部,油藏储层叠置连片分布,造成岩相变化快、物性变化大以及不同期次的火山岩叠置。综合利用火山岩岩心、薄片、测井、地震融合等资料,基于神经网络技术对渤中34-9油田不同岩性结构化... 详细信息

渤海湾盆地渤中34-9油田常规砂岩油藏贯穿火山机构内部,油藏储层叠置连片分布,造成岩相变化快、物性变化大以及不同期次的火山岩叠置。综合利用火山岩岩心、薄片、测井、地震融合等资料,基于神经网络技术对渤中34-9油田不同岩性结构化数据进行有效表述和预测,对新生界火成岩发育特征和火山机构时空演化规律进行研究,明确多岩相沉积时期火山活动范围,并建立不同火山岩相识别方式模板。研究认为,渤中34-9油田火成岩相可分为火山通道相、溢流相、爆发相、次火山岩相和火山沉积相;发育5期复合性火山喷发活动,内部发育多个单一火山旋回相序。经78口开发井实施表明,有针对性地进行评价和优化井位,可有效规避钻遇火成岩的风险,提高砂岩油藏钻遇率。研究成果可为渤海乃至国内外类似油田的勘探和开发提供参考。

关键词：渤海湾盆地砂岩油藏神经网络勘探开发火山喷发火山机构

Serum soluble suppression of tumorigenicity 2 as a novel inflammatory marker predicts the severity of acute pancreatitis

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2021年第38期27卷 6489-6500页

作者： yan Zhang Bo Cheng Zhong-Wei Wu Zong-chao Cui Yao-Dong Song San-yang Chen yan-Na Liu Chang-Ju Zhu Department of Emergency the First Affiliated Hospital of Zhengzhou UniversityZhengzhou 450052Henan ProvinceChina

BACKGROUND Acute pancreatitis(AP)is an inflammatory disease in which the regulatory pathway is complex and not well *** suppression of tumorigenicity 2(sST2)protein receptor functions as a decoy receptor for interleukin(IL)-33 to prevent IL-33/suppression of tumorigenicity 2L(ST2L)-pathwaymediated T helper(Th)2 immune *** To investigate the role of sST2 in *** We assessed the association between sST2 and severity of AP in 123 patients enrolled in this *** serum levels of sST2,C-reactive protein(CRP)and Th1-and Th2-related cytokines,including interferon(IFN)-γ,tumor necrosis factor(TNF)-α,IL-2,IL-4,IL-5 and IL-13,were measured by highly sensitive ELISA,and the severity of AP in patients was evaluated by the 2012 Atlanta Classification *** Serum sST2 levels were significantly increased in AP patients,and further,these levels were significantly elevated in severe AP(SAP)patients compared to moderately severe AP(MSAP)and mild AP(MAP)*** regression showed sST2 was a predictor of SAP[odds ratio(OR):1.003(1.001–1.006),P=0.000].sST2 cutoff point was 1190 pg/mL,and sST2 above this cutoff was associated with ***2 was also a predictor of any organ failure and mortality during AP[OR:1.006(1.003–1.009),P=0.000,OR:1.002(1.001–1.004),P=0.012,respectively].Additionally,the Th1-related cytokines IFN-γand TNF-αin the SAP group were higher and the Th2-related cytokine IL-4 in the SAP group was significantly lower than those in MSAP and MAP *** sST2 may be used as a novel inflammatory marker in predicting AP severity and may regulate the function and differentiation of IL-33/ST2-mediated Th1 and Th2 Lymphocytes in AP homeostasis.

关键词： Acute pancreatitis Soluble suppression of tumorigenicity 2 T-helper 1 cells T-helper 2 cells Interleukin-33 Biomarker

Molecular and functional analysis of chitin synthase genes in Chilo suppressalis(Lepidoptera:Crambidae)

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

Insect Science 2023年第3期30卷 661-676页

作者： Bin Zeng Fu-Rong Chen hao Sun yan Liu Shun-Fan Wu Chris Bass Cong-Fen Gao State&Local Joint Engineering Research Center of Green Pesticide Invention and Application/College of Plant Protection Nanjing Agricultural UniversityNanjingChina College of Life and Environmental Sciences BiosciencesUniversity of ExeterPenrynUK

The rice stem borer,Chilo suppressalis,has developed a high level of resistance to many of the compounds currently used for *** is therefore an urgent need to develop novel control methods for *** chitin synthases(CHS)have attracted interest as a potential target for insect pest ***,to date,CHS have not been characterized in *** CHS genes(CsCHSI and CsCHS2)were identified and cloned from *** transcript variants were identified for CsCHS1,CsCHSla and *** expression profiling showed that both transcripts of CsCHS1 are most highly expressed on the last day of each larval instar stage and show the highest expression levels in the *** contrast,CsCHS2 is predominantly expressed during the larval feeding stages and shows the highest expression levels in the *** of CsCHSI by RNA interference significantly inhibited the molting and pupation of ***,and knockdown of CsCHS2 significantly affected growth during the larval stage,but had no significant effect on the ***,knockout of CsCHS1 by CRISPR/Cas9 genome editing severely lowered the hatching rate,larval survivorship,pupation rate,and eclosion rate,but only larval survivorship at the GO generation was lowered after the knockout of *** results demonstrate that CsCHS1 and CsCHS2 play vital roles in the growth and development of ***,and so have potential as insecticidal targets for the control of this highly damaging pest.

关键词： Chilo suppressalis chitin synthase CRISPR/Cas9 pest control RNA interference

Hot Mixing Behavior and Curing Process of Epoxy Asphalt

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

Journal of Wuhan University of Technology(Materials Science) 2020年第3期35卷 605-610页

作者： LI Huawei WEI Wei ZHANG chao XU Feifan LI Xin JING Peng ZHU Quanyao DING Qingjun yan Boxiang School of Materials Science and Engineering Wuhan University of TechnologyWuhan 430070China Department of Physics Changji UniversityChangji 831100China State Key Laboratory of Sil-icate Engineering Center Wuhan University of TechnologyWuhan 430070China

A new hot mixed epoxy asphalt system was developed. The reaction process of epoxy resin was characterized by Fourier transform infrared spectroscopy (FTIR). The viscosity was investigated by Brinell viscometer when epoxy resin was mixed with asphalt. The glass transition temperature (Tg), homogeneity, thermal stability and viscoelasticity of epoxy asphalt were analyzed by differential scanning calorimetry (DSC), metallographic microscope, thermogravimetric (TG) and dynamic mechanical analysis (DMA). The results showed that the viscosity of epoxy resin modified asphalt reached 1000 mPa·s for more than 180 minutes at 180 ℃, while the best construction process is mixing at 180 ℃ for 2 hours and curing at 60 ℃ for 4 days. The particle size of asphalt is less than 50 μm. In addition, the mechanical properties of the materials are uniform within the specified pavement thickness.

关键词： epoxy asphalt FTIR curing process viscosity dispersed

Syntheses,Structures and Luminescent Properties of the Cadmium(Ⅱ)Complex with 3,3'-Thiodipropionic Acid

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Structural Chemistry 2017年第3期36卷 478-484页

作者： GU Chang-Sheng hao Xiao-Min ZHANG Zhu-yan JI Li-Li LI Yong SONG Wen-Dong Department of Applied Chemistry Guangdong Ocean University College of Pharmacy Harbin Medical University Innovation & Application Institute Zhejiang Ocean University

One new luminescent material of complex {[Cd（DPA）（H_2O）_2]·（H_2O）_2}_n（1） was synthesized by evaporation methods using 3,3A-thiodipropionic acid（DPA） and cadmium nitrate as the starting materials. Compound 1 crystallizes in the monoclinic system,space group P2_1/n with a = 7.5460（7）,b = 13.372（3）,c = 12.304（3） A,β = 95.95（3）o,V = 1234.8（4） A^3,D_c = 1.940 g/cm^3,C_6H_（16）O_8 SCd,M_r = 360.65,F（000） = 720,μ（Mo Ka） = 1.960 mm^-1,Z = 4,R = 0.0460 and wR = 0.1185 for 1835 observed reflections（I 〉 2σ（I））,and R = 0.0591,wR = 0.1245 for all data. The complex has been characterized by elemental analysis,FT-IR,TG,PXRD and X-ray single-crystal structure analysis and the fluorescence property has also been studied. As a result,complex 1 possesses a two-dimensional（2-D） structure through DPA ligands interconnecting Cd2＋ ions. Complex 1 emits the intense fluorescence of 420 nm in the solid state at room temperature.

关键词： cadmium complex 3,3'-thiodipropionic acid crystal structure

Development of a novel rat model of heterogeneous hepatic injury by injection with colchicine via the splenic vein

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2018年第44期24卷 5005-5012页

作者： yan-yan Zhang chao-Xu Zhang Yu Li Xuan Jiang Yong-Fang Wang yang Sun Jun Wang Wan-Ying Ji Yi Liu Medical Imaging Center The Affiliated Hospital of Liaoning Traditional Chinese Medical University Department of Radiology The First Hospital of China Medical University Department of Medical Oncology The First Hospital of China Medical University Department of Cardiac Surgery The First Hospital of China Medical University

AIM To develop a novel rat model of heterogeneous hepatic *** Seventy male Sprague-Dawley rats were randomly divided into a control group(n = 10) and a colchicine group(n =60). A 0.25% colchicine solution(0.4 mL/kg) was injected via the splenic vein in the colchicine group to develop a rat model of heterogeneous hepatic injury. An equal volume of normal saline was injected via the splenic vein in the control group. At days 3, 7, and 14 and weeks 4, 8, and 12 after the operation, at least seven rats of the colchicine group were selected randomly for magnetic resonance imaging(MRI) examinations, and then they were euthanized. Ten rats of the control group underwent MRI examinations at the same time points, and then were euthanized at week 12. T2-weighted images(T2 WI) and diffusion weighted imaging(DWI) were used to evaluate the heterogeneous hepatic injury. The heterogeneous injury between the left and right hepatic lobes was assessed on liver sections according to the histological scoring criteria, and correlated with the results of MRI study. RESULTS Obvious pathological changes occurred in the hepatic parenchyma in the colchicine group. Hepatic injury scores were significantly different between the left and right lobes at each time point(P < 0.05). There was a significant difference in apparent diffusion coefficient(ADC) of DWI and liver-to-muscle ratio(LMR) of T2 WI between the left and right lobes of rats in the colchicine group(P < 0.05) at each time point, and similar results were observed between the colchicine and control groups. Besides, there was a significant correlation between hepatic injury scores and ADC values or LMR(r =-0.682, P = 0.000; r =-0.245, P = 0.018).CONCLUSION Injection with colchicine via the splenic vein can be used to successfully develop a rat model of heterogeneous hepatic injury. DWI and T2 WI may help evaluate the heterogeneous injury among liver lobes.

关键词： Heterogeneous hepatic injury Rat model Colchicine T2-weighted images Diffusion weighted imaging

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

自适应建模策略辅助的昂贵多目标进化算法

太原科技大学学报 2024年第2期45卷 113-118页

作者：张国晨樊凯翔王浩秦淑芬孙超利太原科技大学计算机科学与技术学院太原030024 太原科技大学电子信息工程学院太原030024

代理模型辅助的多目标进化算法广泛用于解决计算费时的多目标优化问题,然而现有的大部分建模方法都是为了嵌入到特定算法而设计的,适应于其他算法的能力并不强,为了能够依据数据特征自适应的建立模型,提出了一种基于自适应模型选择的建... 详细信息

代理模型辅助的多目标进化算法广泛用于解决计算费时的多目标优化问题,然而现有的大部分建模方法都是为了嵌入到特定算法而设计的,适应于其他算法的能力并不强,为了能够依据数据特征自适应的建立模型,提出了一种基于自适应模型选择的建模方法。该方法的主要思想为:依据每个目标函数的样本特征,自适应的选择样本建立全局模型或者局部模型。为了验证所提出建模的方法的有效性,将提出的建模方法应用于基于高斯过程辅助的双存档费时多目标优化算法(KAT2)和基于高斯过程辅助的参考向量引导的费时多目标优化算法(K-RVEA),并且在DTLZ测试函数进行测试。通过实验证明,提出的建模方法可以有效的解决费时多目标优化问题。

关键词：模型辅助的进化算法多目标优化克里金模型自适应