检索结果-南通市图书馆

Journal of Materials Science & Technology 2010年第7期26卷 597-600页

作者： Hongchuan Jiang Chaojie Wang wanli Zhang xu Si Yanrong Li State Key Laboratory of Electronic Thin Film and Integrated Devices University of Electronic Science and Technologyof China Chengdu 610054 China

TaNx thin films were deposited on commercial polished Al2O3 ceramic substrates by reactive dc magnetron sputtering. The influences of the film thickness on the electrical properties of the samples were examined in detail. It is found that the film thickness does not influence the phase structures of the TaNx thin films. The sheet resistances of the samples shift from 173 Ω/sq. to 7.5 Ω/sq. with the film thickness shifting from 30 nm to 280 nm. With the increase of the film thickness from 30 nm to 280 nm, the temperature coefficient of resistance （TCR） of the samples shifts from negative value to positive value. When the film thickness is about 100 nm, TaNx thin films exhibits a near-zero TCR value （approximately -15×10^-6/℃）. This fact implies that TaNx thin films with a null TCR can be obtained by adjusting the film thickness. The variation in the electrical properties of the TaNx thin films with the film thickness can be qualitatively explained by the parallel connection of surface layer with high resistivity and negative TCR and TaNx layer with low resistivity and positive TCR.

关键词： TaNx thin films Film thickness Temperature coefficient of resistance (TCR) Sheet resistance

Correlation between level of serum prolactin and epileptic discharges of electroencephalogram from 24 to 36 hours after epileptic onset

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2006年第3期1卷 256-257页

作者： Xiaowei Hu wanli Dong Min xu Department of Neurology First Hospital Affiliated to Soochow University Suzhou 215006 Jiangsu Province China

BACKGROUND： Researchers discovered that serum prolactin could rise following an epileptic seizure. The prolactin level might reach three times more than basic level within 30 minutes and decrease to the normal value 2 hours after the seizure occurred. The mechanism might result in an increase of serum prolactin concentrations with the activation of the hypothalamic-pituitary axis. OBJECTIVE：To probe into the correlation between changes of serum prolactin and incidence of epileptic discharges of electroencephalogram （EEG） at 24-36 hours after epileptic onset of patients with secondary epilepsy. DESIGN ： Clinical observational study SEI-FING： Department of Neurology, First Hospital affiliated to Soochow University PARTICIPANTS： A total of 21 patients with secondary epilepsy were selected from the Department of Neurological Emergency or Hospital Room of the First Hospital affiliated to Soochow University from November 2005 to April 2006. There were 14 males and 7 females aged from 25 to 72 years. All patients met International League Anti-epileptic （ILAE） criteria in 1981 for secondary generalized tonic clonic seizure through CT or MRI and previous EEG. All patients were consent. Primary diseases included cerebral trauma （3 cases）, tumor （2 cases）, stroke （7 cases） and intracranial infeion （9 cases）. METHODS ： Venous blood of all patients was collected at 24-36 hours after epileptic onset. Serum prolactin kit （Beckman Coulter, Inc in USA） was used to measure value of serum prolactin according to kit instruction. Then, value of serum prolactin was compared with the normal value （male： 2.64-13.13 mg/L; female： 3.34- 26.72 mg/L）; meanwhile, EEG equipment （American Nicolet Incorporation） was used in this study. MAIN OUTCOME MEASURES ： ① Abnormal rate of serum prolactin of patients with secondary epilepsy; ②Comparison between normal and abnormal level of serum prolactin and incidence of EEG epileptic discharge of patients with secondary epilepsy. RESULTS：All 21 patients wit

关键词： Correlation between level of serum prolactin and epileptic discharges of electroencephalogram from 24 to 36 hours after epileptic onset EEG

Effect of microparticle properties on erosion in solid-steam mixtures

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2011年第9期56卷 933-937页

作者： xu wanli WANG JiaDao ZHAO Wei CHEN DaRong Beijing Petroleum Oil and Lubricant Institute Beijing 102300 China State Key Laboratory of Tribology Tsmghua University Beijing 100084 China

Based on a custom-built experimental apparatus, irregular microparticles of different sizes and microparticles of the same size but of different shape were added to wet steam, and erosion experiments were performed on polished medium carbon steel specimens. After the experiments, the eroded surfaces were analyzed by scanning electron microscopy and the degree of damage was evaluated by area loss. The results indicated that microparticle size significantly affects the degree of erosion damage. With an increase in size, variations in the method of damage mainly cause different degrees of damage on an eroded surface. Microparticle shape hardly affects the number of craters. Compared with spherical microparticles, irregular microparticles cause indentations more easily and result in more severe abrasion on the material’s surface.

关键词：固体微粒侵蚀实验湿蒸汽混合物扫描电子显微镜分析性能实验装置损害程度

Water erosion mechanism of mild carbon steels induced by micro-particles

在线全文

学校读者我要写书评

暂无评论

Chinese Science Bulletin 2009年第24期54卷 4577-4582页

作者： xu wanli QIN Li WANG JiaDao CHEN HaoSheng CHEN DaRong State Key Laboratory of Tribology Tsinghua University Beijing 100084 China

To clarify the water erosion mechanism of the mild carbon steels, the water erosion experiments were performed by using deionized water as steam source. The results showed that under the damage threshold velocity of liquid impact, the material surface would not be destroyed. However, when the micro-particles were added into the steam, the pits appeared on the surface soon. By comparison, it is found that the pits are quite different from those induced by micro-particles impact without steam, but similar to those induced by cavitation erosion. The results indicated that the water erosion mechanism was similar to that of cavitation erosion under the damage threshold velocity. The micro-particles carry the micro-bubbles to approach the surface of the material, and the micro-bubbles collapse and generate micro-jet to impinge vertically on the surface, which lead to the produce of pits.

关键词：腐蚀机理钢水诱导微颗粒微观粒子碳阈值速度冲击损伤

Lotus root-like RuIr alloys with close-packed(0001)branches:Strain-driven performance for acidic water oxidation

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2024年第5期92卷 579-590页

作者： Mingyue Xiao wanli xu Rongchao Li Yanhui Sun Jingjun Liu Feng Liu Jun Gan Shixin Gao Beijing Key Laboratory of Electrochemical Process and Technology for Materials Beijing University of Chemical TechnologyBeijing 100029China Yunnan Precious Metals Lab Kunming 650100YunnanChina

Achieving composition tunability and structure editability of nanoalloys with high level strain may be an efficient strategy to remarkably boost catalytic performance toward oxygen evolution reaction(OER)in acidic water ***,lotus root-like RuIr alloys with native micro-strain were constructed by an epitaxial growth of Ru-richened hcp-(0001)branches on Ir-richened fcc-(111)seeds using a polyol thermal synthesis *** resultant Ru_(60)Ir_(40) alloy shows an OER overpotential of 197 mV at 10 mA cm^(-2) and a Tafel slope of 46.59 mV dec^(-1),showing no obvious activity decay for 80 h continuous chronopotentiometry test in 0.5 M H_(2)SO_(4).The related characterizations including X-ray absorption fine structure(XAFS)spectroscopy and density functional theory(DFT)calculations show that that the remarkably improved activity of the lotus root-like alloy can be attributed to the(0001)facet-triggered strain,which can efficiently optimize the electronic band structure of the active metal and the weakening of the chemisorption of oxygen-containing substances to boost OER ***,this work provides a new strategy to designing a class of advanced electrocatalysts with high strain using diverse nanostructures as building materials for carbon-free clean energy conversion systems.

关键词： Rulr alloy Lotusroot-like structure Strain Oxygene volution reaction Activity

Effect of Substrate Movement Speed by Synchronous Rolling-casting Freeform Manufacturing for Metal on Microstructure and Mechanical Property of ZLl04 Aluminum Alloy Slurry

在线全文

学校读者我要写书评

暂无评论

Journal of Wuhan University of Technology(Materials Science) 2015年第5期30卷 1056-1060页

作者：罗晓强李正阳 CHEN Guangnan xu wanli 燕青芝 School of Materials Science and Technology University of Science and Technology Beijing Institute of Mechanics Chinese Academy of Sciences

Synchronous rolling-casting freeform manufacturing for Metal(SRCFMM) means that the refined liquid metal is continuously pressed out from the bottom of crucible. There is a horizontal movable plate beneath the outlet. The clearance between the outlet and the plate is about several hundred micrometers. SRCFMM, similar to additive manufacturing, implies layer by layer shaping and consolidation of feedstock to arbitrary configurations, normally using a computer controlled movable plate. The primary dendritic crystal is easily crushed by movement of substrate in the rolling-casting area. ZL104 was used as the test materials, determining the control temperature by differential scanning thermal analysis(DSC), preparing a kind of samples by SR CFMM, then analyzing microstructures and mechanical property of the samples. Characteristics and distribution of the primary particles were assessed by optical microscopy(OM), scanning electron microscopy(SEM), energy dispersive spectrum(EDS) and image analysis software. Mechanical property of the samples was assessed by vickers hardness. The results show that the samples fabricated by SRCFMM have uniform structures and good performances with the velocity of the substrate controlled about 10 cm/s and temperature at about 580 ℃.

关键词： synchronous rolling-casting additive manufacturing technology temperature substrate movement speed

Effects of biochar on water movement characteristics in sandy soil under drip irrigation

在线全文

学校读者我要写书评

暂无评论

Journal of Arid Land 2019年第5期11卷 740-753页

作者： PU Shenghai LI Guangyong TANG Guangmu ZHANG Yunshu xu wanli LIPan FENG Guangping DING Feng College of Water Resources and Civil Engineering China Agriculture UniversityBeijing 100083China Institute of Soil Fertilizer and Agricultural Water Saving Xinjiang Academy of Agricultural SciencesUrumqi 830091China Key Laboratory of Northwest Oasis Agricultural Environment Ministry of Agriculture of ChinaUrumqi 830091China

Biochar addition can improve the physical and hydraulic characteristics of sandy *** study investigated the effects of biochar on water holding capacity and water movement in sandy soil under drip *** indoor simulation experiments,the effects of biochar application at five levels(0%,1%,2%,4%and 6%)on the soil water retention curve,infiltration characteristics of drip irrigation and water distribution were tested and *** results showed that biochar addition rate was positively correlated with water holding capacity of sandy soil and soil available *** the same infiltration time,with an increasing amount of added biochar,the diffusion distance of the horizontal wetting front(HWF)tended to decrease,while the infiltration distance of vertical wetting front(VWF)initially declined and then *** features of wetted bodies changed from"broad-shallow"to"narrow-deep"*** relationship between the transport distances of HWF and VWF and the infiltration time was described by a power *** the same distance from the point source,the larger the amount of added biochar,the higher the soil water *** had a great influence on the water content of the layer with biochar(0–200 mm)and had some effects at 200–250 mm without biochar;but it had less influence on the soil water content deeper than 250 *** the application rate of biochar of 4%,most water was retained within 0–250 mm soil ***,when biochar application amount was high(6%),it would be helpful for water *** the improvement of sandy soil,biochar application rate of 4%in the plow layer had the best effect.

关键词： biochar sandy soil water holding capacity water movement drip irrigation

Electroacupuncture relieves irritable bowel syndrome by increasing expression of nucleotide-binding oligomerization domain protein-like receptor family pyrin domain containing 6 in water-avoidance stress mice

在线全文

学校读者我要写书评

暂无评论

Journal of Traditional Chinese Medicine 2020年第3期40卷 407-413页

作者： Song Yafang Geng Hao Chen Lu Wu Xiaoliang Yuan Mengqian xu wanli Guo Jing Sun Jianhua Pei Lixia Department of acupuncture The Affiliated Hospital of Nanjing University of Chinese MeidicneNanjing 210029China Department of the First Clinical Medical College Nanjing University of Chinese MedicineNanjing 210023China

OBJECTIVE: To investigate the effect of electroacupuncture(EA) on irritable bowel syndrome(IBS) in mice through regulating nucleotide-binding oligomerization domain protein-like receptor family pyrin domain containing 6(NLRP6).METHODS: Water-avoidance stress(WAS) mice model was used to investigate the effects and the mechanism of EA. Abdominal withdrawal reflex test, open field test, and intestinal motility test were used to evaluate visceral sensitivity, anxiety,and intestinal motility in mice. The expressions of NLRP6, Mucin-2(MUC2) and E-cadherin were determined using immunofluorescence and Western blotting ***: EA significantly upregulated the expression of NLRP6 in the intestine of mice. Moreover, EA increased the expressions of MUC2 and E-cadherin in WAS ***: Our study found that the relief of IBS symptoms by EA may involve the increase in the expression of NLRP6 in WAS mice.

关键词： Electroacupuncture Nod signaling adaptor proteins Irritable bowel syndrome

Renal Effects of Prosthetic Abdominal Aortic Aneurysm in Dogs

在线全文

学校读者我要写书评

暂无评论

畜牧与兽医 2012年第S2期44卷 44-45页

作者： LV Yu-huan xu Zai-pin xu wanli MA Zhe PENG Yao DU Peihang SUN Anqiang Deng Xiaoyan LOU Hanjun Department of Animal Medicine Guizhou University College of Biological & Medical Engineering Beihang University

To provide experimental model for abdominal aortic aneurysm research and to optimize design of stent-graft,the authors established an animal models of prosthetic abdominal aortic aneurysm (PAAA) in dogs,evaluated its biofunction,biocompatibility and renal *** PAAA was sutured using aneurysm neck (Φ 6 mm artificial blood vessel) and aneurysm body (Φ 29 and 31mm artificial blood vessel,respectively). Sixteen healthy adult dogs,with weight of 13. 5 ± 0. 66 kg,were randomly divided into 2 groups: group 29 mm and group 31 mm,8 in each group. Infrarenal aortic artery was reconstructed with PAAA to establish abdominal aortic aneurysm (AAA) animal model. Blood coagulation index such as prothrombin time (PT),activated partial thromboplatin time (APTT),thrombin time (TT) and Fibrinogen (Fbg) were detected pre-operation,1,7 and 14 days post-operation,respectively. Blood routine parameters were detected pre-operation 11,3 and 7 days post-operation. Renal function parameters such as blood urea nitrogen (BUN),creatinine (CREA),urea acid (UA) and urea/ creatinine (BU/CREA) were evaluated pre-operation and 30,90,150 days post-operation,respectively. PAAA were removed en bloc to determinine its biofuction and biocompatibility after 5 months of surgery. Kidneys were fixed in neutral buffered formalin solution,pathological slice were conducted to observate pathological changes of kidneys by HE *** results are as follows:1. Animal model: The PAAA was implanted to the infrarenal abdominal aortic artery without extensive bleeding after anastomosis. One dog died 2,25 and 127 days post-operation in group 31 mm,respectively,and the overall success rate was 62. 5%. One dog died 7 days post-operation in group 29 mm,the overall success rate was 87. 5%.2. Biofunction and biocompatibility of PAAA: Autopsy showed that there were no abdominal adhesions around the PAAAs,the lumen was patent without blood clots,there were no bleeding in PAAAs in two groups. Biocompatibility was poor bec

关键词： Abdominal aortic aneurysm Animal model Artificial blood vessel Canine

Nurses’experiences of caring for preterm infants in pain:A metaethnography

在线全文

学校读者我要写书评

暂无评论

International Journal of Nursing Sciences 2022年第4期9卷 533-541页

作者： Tingting Zhao Angela R.Starkweather Adam Matson Shabnam Lainwala wanli xu Xiaomei Cong School of Nursing University of ConnecticutStorrsCTUSA College of Nursing University of FloridaGainesvilleFLUSA Division of Neonatology Connecticut Children’s Medical CenterHartfordCTUSA Department of Pediatrics University of Connecticut School of MedicineFarmingtonCTUSA School of Nursing Yale UniversityOrangeCTUSA

Objective:Preterm infants are subjected to numerous painful procedures during their neonatal intensive care unit(NICU)*** advancements in pain alleviation,nurses remain challenged to provide timely and effective pain management for preterm *** understanding of the lived experience of nurses caring for preterm infants in pain could provide novel insights to improve pain management for this vulnerable *** aim of this meta-ethnography was to synthesize and interpret qualitative findings of nurses’experiences of taking care of preterm infants in ***:An extensive literature search in PubMed,CINAHL,PsycINFO,Scopus,BIOSIS and ProQuest Dissertation and Theses Database was conducted,including studies within the past 10 *** nursing researchers conducted data extraction and analysis *** criteria were applied to search for qualitative studies of nurse participants who worked in the NICU taking care of preterm *** published in a language other than English,articles that did not include qualitative data and qualitative data that could not be extracted from the findings or did not discuss nurses’experiences were *** Appraisal Skills Programme was used for literature quality ***:Eight studies remained after further screening according to inclusion and exclusion *** eight studies were conducted from 2013 to 2018 and totally enrolled 205 nurses from Iran,Canada,the United States,Finland,Sweden,Switzerland,and *** themes emerged on the nurses’perspectives of taking care of preterm infants in pain:1)They sense the neonatal pain;2)Adverse consequences of unrelieved pain;3)Barriers of managing pain;4)Concerns of available approaches for pain relief;5)Failure to work with ***:This meta-ethnography identified nurses’understanding of pain in preterm infants that can be assessed,and they acknowledged that unrelieved pain could cause deve

关键词： Neonatal intensive care units Premature infant Pain measurement Parents Pain Nursing care Nurses