检索结果-南通市图书馆

Current oscillations and low-frequency noises in GaAs MESFET channels with sidegating bias

在线全文

学校读者我要写书评

暂无评论

Journal of Zhejiang University-Science C(Computers and Electronics) 2011年第7期12卷 597-603页

作者： Yong ding ,xiao-hua LUO ,xiao-lang YAN (Institute of VLSI Design,Zhejiang University,Hangzhou 310027,China) Institute of VLSI Design Zhejiang University

Low-frequency noises (LFN) and noise-like oscillations (NLO) in GaAs metal semiconductor field effect transistor (MESFET) channel current were investigated under sidegating bias *** was found that the fluctuations of the channel current were directly dependent upon the sidegating *** the sidegating bias decreased,the amplitudes of the oscillations would increase ***,the LFN and NLO would attenuate sharply when the sidegating bias increased to more than a certain *** mechanisms are presented to demonstrate that the effective substrate resistivity or the channel-substrate junction modulated by sidegating bias and deep level traps would take responsibilities for the LFN and NLO.

关键词： Low-frequency noises (LFN) Effective substrate resistivity Channel-substrate junction Sidegating bias

声音对NICU早产儿生长发育影响的系统评价再评价

在线全文

学校读者我要写书评

暂无评论

中国疗养医学 2024年第1期33卷 12-18页

作者：马子怡丁晓华王玥苗俊芳曹昕怡马国婧甘肃中医药大学护理学院甘肃兰州730000 甘肃省妇幼保健院护理部甘肃兰州730000 兰州大学护理学院甘肃兰州730000

目的检索并再评价声音对NICU早产儿生长发育影响的系统评价,为临床医务人员临床决策及早产儿健康干预策略的持续改进提供参考。方法计算机检索The Cochrane Library、Embase、PubMed、Web of Science、万方、中国知网、维普和中国生物... 详细信息

目的检索并再评价声音对NICU早产儿生长发育影响的系统评价,为临床医务人员临床决策及早产儿健康干预策略的持续改进提供参考。方法计算机检索The Cochrane Library、Embase、PubMed、Web of Science、万方、中国知网、维普和中国生物医学文献数据库,检索关于声音对NICU早产儿影响的系统评价/Meta分析/荟萃分析,检索时间为建库至2023年5月。2名研究人员应用AMSTAR对文献进行方法学质量评价后,通过GRADE进行证据整理与分级。结果初检文献405篇,最终纳入文献20篇,AMSTAR质量评价结果表明,高等质量文献有5篇,其余15篇均为中等质量,纳入文献的总体方法学质量较低。采用GRADE系统对20篇系统评价的79条结局指标的证据质量评价结果显示,12条证据为中等质量,34条证据为低等质量,33条证据为极低质量。结论声音干预有利于改善NICU早产儿的相关生理指标、睡眠效率、行为状态、神经行为及大脑发育,可促进早产儿健康恢复,但系统评价的方法学质量和证据的质量均较低,临床实践需谨慎采纳有关证据,并逐步进行更加规范、严谨的研究。

关键词：声音新生儿重症监护室早产儿生长发育系统评价再评价循证护理学

Analysis of key technologies and development of integrated digital processing system for cast blasting design

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2015年第3期22卷 1037-1044页

作者：丁小华李克民肖双双狐为民 School of Mines China University of Mining & Technology State Key Laboratory of Coal Resources and Safe Mining (CUMT) Department of Computer North China Institute Science of Technology

Casting blast can greatly reduce the stripping cost and improve the production capacity of opencast coal mines. Key technologies including high bench blasting, inclined hole, millisecond blasting, pre-splitting blasting and casting blast parameters determination which have influence on the effect of casting blast have been researched with the combination of the ballistic theory and experience in mines. The integrated digital processing system of casting blast was developed in order to simplify the design process of casting blast, improve working efficiency and veracity of design result and comprehensively adopt the software programming method and the theory of casting blast. This system has achieved five functions, namely, the 3D visualization graphics management, the intelligent management of geological information, the intelligent design of casting blast, the analysis and prediction of the blasting effect and the automatic output of the design results. Long-term application in opencast coal mines has shown that research results can not only reduce the specific explosive consumption and improve the blasting effect, but also have high value of popularization and application.

关键词： opencast coal mine cast blasting key technology digital processing system

Stepwise sedation for elderly patients with mild/moderate COPD during upper gastrointestinal endoscopy

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2013年第29期19卷 4791-4798页

作者： Can-Xia Xu Xiong Chen Yan Jia ding-hua xiao Hui-Fang Zou Qin Guo Fen Wang xiao-Yan Wang Shou-Rong Shen Ling-Ling Tong Ke Cao xiao-Ming Liu Department of Gastroenterology Third Xiangya Hospital of Central South University Department of Health Statistics University of South China Department of Oncology Third Xiangya Hospital of Central South University

AIM: To investigate stepwise sedation for elderly patients with mild/moderate chronic obstructive pulmonary disease (COPD) during upper gastrointestinal (GI) endoscopy. METHODS: Eighty-six elderly patients with mild/moderate COPD and 82 elderly patients without COPD scheduled for upper GI endoscopy were randomly assigned to receive one of the following two sedation methods: stepwise sedation involving three-stage administration of propofol combined with midazolam [COPD with stepwise sedation (group Cs), and nonCOPD with stepwise sedation (group Ns)] or continuous sedation involving continuous administration of propofol combined with midazolam [COPD with continuous sedation (group Cc), and non-COPD with continuous sedation (group Nc)]. Saturation of peripheral oxygen (SpO 2 ), blood pressure, and pulse rate were monitored, and patient discomfort, adverse events, drugs dosage, and recovery time were recorded. RESULTS: All endoscopies were completed successfully. The occurrences of hypoxemia in groups Cs, Cc, Ns, and Nc were 4 (9.3%), 12 (27.9%), 3 (7.3%), and 5 (12.2%), respectively. The occurrence of hypoxemia in group Cs was significantly lower than that in group Cc (P < 0.05). The average decreases in value of SpO 2 , systolic blood pressure, and diastolic blood pressure in group Cs were significantly lower than those in group Cc. Additionally, propofol dosage and overall rate of adverse events in group Cs were lower than those in group Cc. Finally, the recovery time in group Cs was significantly shorter than that in group Cc, and that in group Ns was significantly shorter than that in group Nc (P < 0.001). CONCLUSION: The stepwise sedation method is effective and safer than the continuous sedation method for elderly patients with mild/moderate COPD during upper GI endoscopy.

关键词： Upper gastrointestinal endoscopy Adverse events Sedation Monitoring Chronic obstructive pulmonary disease

A brand new green coating technology for realizing the regulation of spherical propellant energy release process

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

Defence Technology（防务技术） 2024年第6期36卷 78-94页

作者： Wenhao Fan Yajun ding Zhongliang xiao School of Chemistry and Chemical Engineering Nanjing University of Science and TechnologyNanjing210094China Key Laboratory of Special Energy Materials Nanjing University of Science and TechnologyMinistry of EducationNanjing 210094China

To achieve the controllable release of energy of nitrocellulose-based propellants,this paper combines the cellulose-based nanocomposites aqueous coating(Surelease®-NC)with fluidized bed coating equipment to successfully prepare the coated spherical propellant for the first *** effects of fluidized bed coating temperature,air velocity,flow speed and atomization pressure on the adhesion rate,coating integrity and coating uniformity of the coated spherical propellant were investigated,and the preparation of coated spherical propellant with homogeneous size and structural integrity was achieved for the first *** microscopic morphology,chemical structure,water vapor adsorption behavior,combustion performance,and ageing resistance property of the coated spherical propellant were systematically investigated by,Fourier transforms infrared spectroscopy(FTIR),Micro confocal raman spectrometer,field scanning electron microscopy(SEM),dynamic vapor adsorption techniques,and closed bomb test,confirming the surface core-shell structure and the tightly bonded interfacial structure of coated spherical ***,the coated spherical propellant has good hygroscopic,excellent progressive burning and long storage stability.

关键词： Nanocomposites aqueous coating Fluidized bed coating equipment Coated spherical propellant Controllable release of energy Long storage stability

Physical simulation test of soil-rock mixture from synthetic transparent soil

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2018年第12期25卷 3085-3097页

作者： ding xiao-hua ZHOU Wei LU Xiang GAO Yan School of Mines China University of Mining&TechnologyXuzhou221116China State Key Laboratory of Coal Resources and Safe Mining China University of Mining&TechnologyXuzhou221116China

The waste dump of open-pit coal mine is remade of soil-rock mixture under the action of gravity,dynamic load of transportation equipment and earthquake,*** using artificial synthetic transparent soil,the developing process and migration law for soil-rock mixture are observed in the remade *** mixture of fused quartz sand,liquid paraffin and n-tridecane is chosen as the material for synthetic transparent soil which is mixed with liquid paraffin and n-tridecane at a mass ratio of4.4at room temperature of17℃.Physical and mechanical properties of transparent soil are determined by physical test and compared with those in natural sandy *** results show that transparent soil and sandy soil have high similarity,in other words,transparent soil can be used for similar simulation experiments of soil-rock mixture.

关键词： transparent soil waste dump soil-rock mixture physical test

Transcatheter arterial chemoembolization combined with PD-1 inhibitors and Lenvatinib for hepatocellular carcinoma with portal vein tumor thrombus

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2024年第8期30卷 843-854页

作者： Hong-xiao Wu xiao-Yan ding Ya-Wen Xu Ming-hua Yu xiao-Mi Li Na Deng Jing-Long Chen Cancer Center Beijing Ditan HospitalCapital Medical UniversityBeijing 100015China

BACKGROUND Hepatocellular carcinoma(HCC)patients complicated with portal vein tumor thrombus(PVTT)exhibit poor prognoses and treatment *** To investigate efficacies and safety of the combination of PD-1 inhibitor,transcatheter arterial chemoembolization(TACE)and Lenvatinib in HCC subjects comorbid with *** From January 2019 to December 2020,HCC patients with PVTT types Ⅰ-Ⅳ were retrospectively enrolled at Beijing Ditan *** were distributed to either the PTL or TACE/Lenvatinib(TL)*** median progression-free survival(mPFS)was set as the primary endpoint,while parameters like median overall survival,objective response rate,disease control rate(DCR),and toxicity level served as secondary *** Forty-one eligible patients were finally recruited for this study and divided into the PTL(n=18)and TL(n=23)*** a median follow-up of 21.8 months,the DCRs were 88.9%and 60.9%in the PTL and TL groups(P=0.046),***,mPFS indicated significant improvement(HR=0.25;P<0.001)in PTL-treated patients(5.4 months)compared to TL-treated(2.7 months)*** were no treatment-related deaths or differences in adverse events in either *** A triplet regimen of PTL was safe and well-tolerated as well as exhibited favorable efficacy over the TL regimen for advanced-stage HCC patients with PVTT types Ⅰ-Ⅳ.

关键词： Hepatocellular carcinoma Transcatheter arterial chemoembolization Lenvatinib PD-1 inhibitor Portal vein tumor thrombus

Analytical model for predicting time-dependent lateral deformation of geosynthetics-reinforced soil walls with modular block facing

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 Rock Mechanics and Geotechnical Engineering 2024年第2期16卷 711-725页

作者： Luqiang ding Chengzhi xiao Feilong Cui School of Civil and Transportation Engineering Hebei University of TechnologyTianjin300401China

To date,few models are available in the literature to consider the creep behavior of geosynthetics when predicting the lateral deformation(d)of geosynthetics-reinforced soil(GRS)retaining *** this study,a general hyperbolic creep model was first introduced to describe the long-term deformation of geosynthetics,which is a function of elapsed time and two empirical parameters a and *** conventional creep tests with three different tensile loads(Pr)were conducted on two uniaxial geogrids to determine their creep behavior,as well as the a-Pr and b-Pr *** test results show that increasing Pr accelerates the development of creep deformation for both ***,a and b respectively show exponential and negatively linear relationships with Pr,which were confirmed by abundant experimental data available in other *** on the above creep model and relationships,an accurate and reliable analytical model was then proposed for predicting the time-dependent d of GRS walls with modular block facing,which was further validated using a relevant numerical investigation from the previous *** evaluation and comparison of the proposed model with six available prediction models were *** a parametric study was carried out to evaluate the effects of wall height,vertical spacing of geogrids,unit weight and internal friction angle of backfills,and factor of safety against pullout on d at the end of construction and 5 years *** findings show that the creep effect not only promotes d but also raises the elevation of the maximum d along the wall ***,the limitations and application prospects of the proposed model were discussed and analyzed.

关键词： Geosynthetics Creep behavior Geosynthetics-reinforced soil(GRS)walls Lateral deformation Analytical model

Detection of QTLs for Important Agronomic Traits and Analysis of Their Stabilities Using SSSLs in Rice

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

Agricultural Sciences in China 2007年第7期6卷 769-778页

作者： ZHAO Fang-ming ZHU Hai-tao ding xiao-hua ZENG Rui-zhen ZHANG Ze-min LI Wen-tao ZHANG Gui-quan Guangdong Provincial Key Laboratory of Plant Molecular Breeding South China Agricultural University Guangzhou 510642 P.R.China

Single segment substitution lines （SSSLs） each with a single chromosome segment from a donor under the same genetic background as the recipient were developed in rice by advanced backcrossing and molecular marker-assisted selection. Using the SSSLs, the QTLs for the important agronomic traits in rice would be detected under different environmental conditions. Detection of the QTLs controlling 22 important traits in rice was done with 32 SSSLs by the randomized block design in 2-4 cropping seasons. 59 QTLs were detected and distributed on chromosomes 1, 2, 3, 4, 6, 7, 8, 10, and 11, of which 18 QTLs were detected more than twice. Only 30.5% of the QTLs were detected repeatedly in different cropping seasons. Most of the QTLs of important agronomic traits were of little additive effects and instability. The QTLs controlling the traits, such as grain weight, grain length, ratio of grain length to width, and heading date were relatively stable. The stable QTLs usually had larger additive effects and were less affected by environment. The QTLs for the important agronomic traits were detected using the SSSLs in rice with high resolution under different environmental conditions. The instability of the QTLs may be the basis of the variation of rice plants during growth and development. It would be the genetic basis for improving yield and quality in rice cultivars by farming methods.

关键词： rice single segment substitution line quantitative trait locus agronomic trait