检索结果-南通市图书馆

Adiabatic shear banding of hot-extruded tungsten heavy alloy under cryogenic temperature

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2012年第1期31卷 17-21页

作者： Liu, Jinxu yang, jia Zhou, Jingyi Li, Shukui Guo, Wenqi School of Materials Science and Engineering Beijing Institute of Technology Beijing 100081 China

The effect of cryogenic temperature on adiabatic shear banding (ASBing) of tungsten heavy alloy (WHA) processed by hot-hydrostatic ex-trusion was *** show that,when the initial temperature is decreased,the dynamic flow stress,the critical failure time,and the dynamic failure energy of specimens show an increasing tendency,while the susceptibility to ASB of WHA shows a decreasing tendency,which is characterized by decreased shear strain and increased width of shear *** analysis shows that the number of mi-crocracks within ASB exhibits an increasing tendency with decreased initial temperature,and the dynamic recrystallization (DRX) process within ASB is evidently suppressed at the lower *** a result of the lower temperature,the motion and rearrangement of disloca-tion are effectively suppressed,which is mainly responsible for the incomplete DRX process within ASB and decreases susceptibility to ASB.

关键词： adiabatic shear bands dynamic behaviors tungsten heavy alloys microstructure evolution dynamic recrystallization

Combined Hangzhou criteria with neutrophillymphocyte ratio is superior to other criteria in selecting liver transplantation candidates with HBV-related hepatocellular carcinoma

在线全文

学校读者我要写书评

暂无评论

Hepatobiliary & Pancreatic Diseases International 2015年第6期14卷 588-595页

作者： Guang-Qin Xiao jia-Yin yang Lu-Nan Yan Liver Transplantation Center West China HospitalSichuan University Department of Biliary-Pancreatic Surgery Tongji Hospital of Tongji Medical CollegeHuazhong University of Science and Technology

BACKGROUND： The elevation of neutrophil-lymphocyte ratio （NLR） has adverse effects on the prognosis of patients with hepatocellular carcinoma （HCC） who have received liver transplantation （LT）. The Hangzhou criteria are set for selecting HCC patients for LT. The present study aimed to establish a set of new criteria combining the NLR and Hangzhou crite- ria for selecting HCC patients for LT.

关键词： Hangzhou criteria hepatocellular carcinoma liver transplantation neutrophil-lymphocyte ratio hepatitis B virus biomarker

Paleoenvironment reconstruction of the Middle Ordovician thick carbonate from western Ordos Basin, China

在线全文

学校读者我要写书评

暂无评论

Petroleum Science 2023年第1期20卷 48-59页

作者： jia-Qi yang Jun-Tao Zhang Zhi-Liang He Tao Zhang School of Energy Resources China University of GeosciencesBeijing100083China SINOPEC Exploration and Production Research Institute Beijing100083China China Petrochemical Corporation Ltd. Beijing100728China

Reconstructing paleoenvironments has long been considered a vital component for understanding the development and evolution of carbonate *** Middle Ordovician Period is considered the archetypical greenhouse interval,and also a critical period in biological *** Middle Darriwilian isotope carbon excursion has been observed in many areas of the world and may be related to the biological explosions caused by decreases in the *** thick carbonate rocks in the fifth member of the Middle Ordovician Majiagou Formation in the Dingbei area of the Ordos Basin were chosen as an example,based on the concentration of major,trace and rare earth elements as well as C,O and Sr isotopic analyses,the paleoenvironment was *** its impact on natural gas exploration was *** results show that the seawater paleotemperature was 29℃,suboxicanoxic paleoredox conditions were observed,and the seawater paleosalinity was high.A large number of plankton in the biological explosion caused a rapid increase in the total organic carbon in carbonate rocks,which provided natural gas as supplemental source *** by early meteoric water,the dissolution of gypsum laid the foundation for high-quality reservoirs,and the residual gypsum also further preserved natural *** study provides new data for the paleoenvironment and a theoretical basis for further natural gas exploration.

关键词： Middle darriwilian isotope carbon excursion Paleoenvironment Natural gas exploration Middle ordovician Ordos basin

DNA Hydrogels Formed of Bended DNA Scaffolds and Properties Study

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2017年第10期35卷 1307-1314页

作者： hao-yang jia jie-zhong shi yu shao 刘冬生 Key Laboratory of Organic Optoelectronics & Molecular Engineering of the Ministry of Education Department of Chemistry Tsinghua University Beijing 100084 China

In recent years, DNA supramolecular hydrogels have attracted much attention due to their injectability, biocompatibility, responsiveness and self-healing properties. In this work, we designed a linear DNA brick containing one duplex with two cytosine（C）-rich sequence on both ends. This brick can first assemble to form duplex under p H 8 condition. After adjusting the p H to 5, the C-rich sequence tends to form intermolecular i-motif structure, which joins the linear DNA molecules together to form interlocked cyclic structures and yield the DNA hydrogel. By adjusting the length and bending curvature of the duplex part of the molecule, one can change the basic unit of the hydrogel structure to tune the properties of the DNA hydrogel.

关键词： Linear DNA Hydrogel Bended structures

A Layer-Structured Metal-Organic Framework-Derived Mesoporous Carbon for Efficient Oxygen Reduction Reaction

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Physics 2016年第6期29卷 693-698,I0001页

作者： Hong-guang Song Yan-iun Ding jia yang Hang-xun Xu CA5KeyLaboratoryofSoftMatterChemistry DepartmentofPolymerScienceandEngineeringUniversityofScienceandTechnologyofChinaHefei230026China

Developing highly active and durable electrocatalysts for the oxygen reduction reaction （ORR） is crucial to large-scale commercialization of fuel cells and metal-air batteries. Here we report a facile approach for the synthesis of nitrogen and oxygen dual-doped meso-porous layer-structured carbon electrocatalyst embedded with graphitic carbon coated cobalt nanoparticles by direct pyrolysis of a layer-structured metal-organic framework. The elec- trocatalyst prepared at 800℃ exhibits comparable ORR performance to Pt/C catalysts but possesses superior stability to Pt/C catalysts. This synthetic approach provides new prospects in developing sustainable carbon-based electrocatalysts for electrochemical energy conversion devices.

关键词： Electrocatalysis Oxygen reduction reaction Mesoporous carbon Cobaltnanoparticles

Coupling of small-and large-scale filament eruptions

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

Research in Astronomy and Astrophysics 2016年第1期16卷 23-30页

作者： jia-Yan yang Yun-Chun jiang Bo yang Jun-Chao Hong Zhe Xu Yunnan Observatories Chinese Academy of Sciences Kunming 650011 China University of Chinese Academy of Sciences Beijing 100049 China

We present observations of the eruption of a large-scale quiescent filament （LF） that is associated with the formation and eruption of a miniature filament （MF）. As a result of convergence and subsequent cancelation of opposite-polarity magnetic flux, MF was formed just below the spine of the LF＇s right seg- ment. Probably triggered by a nearby newly emerging flux, MF underwent a failed eruption immediately after its full development, which first ejected away from the spine of LF and then drained back to the Sun. This eruption no sooner started than the overlying LF＇s right segment began to rise slowly and the LF＇s other parts were also disturbed, and eventually the whole LF erupted bodily and quickly. These observa- tions suggest that the MF can serve as an intermediary that links the photospheric small-scale magnetic-field activities to the eruption of the overlying large filament. It appears that, rather than directly interacting with the supporting magnetic field of LF, small-scale flux cancelation and emergence in the LF＇s channel can manifest themselves as the formation and eruption of MF and so indirectly affect the stability of LE

关键词： Sun: activity -- Sun: filaments -- Sun: magnetic fields

P16 gene hypermethylation and hepatocellular carcinoma:A systematic review and meta-analysis

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2011年第25期17卷 3043-3048页

作者： jia-Jie Zang Feng Xie Jin-Fang Xu Ying-Yi Qin Rong-Xi Shen jia-Mei yang jia He Department of Health Statistics Second Military Medical Univer-sity Shanghai 200433 China Department of Special Treatment and Liver Transplantation Eastern HepatobiliarySurgery Hospital Second Military Medical University Shanghai200438 China

AIM:To quantitatively investigate the effect of p16 hypermethylation on hepatocellular carcinoma (HCC) and hepatocirrhosis using a meta-analysis of available casecontrol ***:Previous studies have primarily evaluated the incidence of p16 hypermethylation in HCC and corresponding control groups,and compared the incidence of p16 hypermethylation in tumor tissues,pericancer liver tissues,normal liver tissues and non-tumor liver tissues with that in other *** regarding publication information,study characteristics,and incidence of p16 hypermethylation in both groups were collected from these studies and ***:Fifteen studies,including 744 cases of HCC and 645 non-tumor cases,were identified for *** significant odds ratios (ORs) of p16 hypermethylation were obtained from tumor tissues and non-tumorous liver tissues of HCC patients (OR 7.04,95% CI:3.87%-12.78%,P < 0.0001),tumor tissues of HCC patients and healthy liver tissues of patients with other diseases (OR 12.17,95% CI:6.64%-22.31%,P < 0.0001),tumor tissues of HCC patients and liver tissues of patients with non-tumorous liver diseases (OR 6.82,95% CI:4.31%-10.79%,P < 0.0001),and cirrhotic liver tissues and non-cirrhotic liver tissues (OR 4.96,95% CI:1.45%-16.96%,P=0.01).The pooled analysis showed significantly increased ORs of p16 hypermethylation (OR 6.98,95% CI:4.64%-10.49%,P < 0.001) from HCC tissues and cirrhotic ***:P16 hypermethylation induces the inactivation of p16 gene,plays an important role in hepatocarcinogenesis,and is associated with an increased risk of HCC and liver cirrhosis.

关键词： P16 hypermethylation Hepatocellular carci-noma Liver cirrhosis Meta-analysis Odds ratio

Effects of spinning parameters on microstructures of ellipsoidal heads during marginal-restraint mandrel-free spinning

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

Advances in Manufacturing 2020年第4期8卷 457-472页

作者： jia-yang Chen Yong-Cheng Lin Guo-Dong Pang Xin-He Li School of Mechanical and Electrical Engineering Central South UniversityChangsha 410083People's Republic of China State Key Laboratory of High Performance Complex Manufacturing Changsha 410083People's Republic of China

Marginal-restraint mandrel-free spinning is an advanced technology for manufacturing ellipsoidal heads with large diameter-thickness *** effects of spinning parameters on the forming accuracy of ellipsoidal heads have been studied,and optimized spinning parameters have been *** microstructure evolution of a workpiece is usually very complicated in the spinning *** this work,the influence of spinning parameters on the microstructures of two-pass spun ellipsoidal heads is *** is found that the forming angle and feed rate of the first pass,angle between passes,and feed rate of the second pass significantly affect the ***,the evolution rule of the microstructures near the inner and outer surfaces of the spun parts is almost consistent.A large forming angle,large angle between passes,or large feed rate of the second pass are beneficial to obtain uniform microstructures.A small or large feed rate of the first pass reduces the microstructure *** improve the microstructure uniformity between the inner and outer surfaces,the optimized spinning parameters are determined.

关键词： Spinning Thin-walled ellipsoidal heads Spinning parameters Microstructure evolution

Radiomics in the diagnosis and treatment of hepatocellular carcinoma

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

Hepatobiliary & Pancreatic Diseases International 2023年第4期22卷 346-351页

作者： Chun jiang Yi-Qi Cai jia-jia yang Can-Yu Ma jia-Xi Chen Lan Huang Ze Xiang jian Wu Department of Clinical Laboratory The Affiliated Suzhou Hospital of Nanjing Medical UniversitySuzhou Municipal HospitalGusu SchoolNanjing Medical UniversitySuzhou 215008China Zhejiang University School of Medicine Hangzhou 310030China Department of Infection Management The Affiliated Suzhou Hospital of Nanjing Medical UniversitySuzhou Municipal HospitalGusu SchoolNanjing Medical UniversitySuzhou 215008China

Hepatocellular carcinoma(HCC)is a common malignant *** present,early diagnosis of HCC is dif-ficult and therapeutic methods are *** can achieve accurate quantitative evaluation of the lesions without invasion,and has important value in the diagnosis and treatment of *** fea-tures can predict the development of cancer in patients,serve as the basis for risk stratification of HCC patients,and help clinicians distinguish similar diseases,thus improving the diagnostic ***-more,the prediction of the treatment outcomes helps determine the treatment *** is also helpful in predicting the HCC recurrence,disease-free survival and overall *** review summa-rized the role of radiomics in the diagnosis,treatment and prognosis of HCC.

关键词： Hepatocellular carcinoma Radiomics Diagnosis Prognosis Treatment