检索结果-南通市图书馆

Accurate prediction method for the microstructure of amorphous alloys without non-metallic elements

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2021年第11期30卷 440-444页

作者： Wei Zhao jia-lin cheng Gong Li Xin Wang School of Materials Science and Engineering Nanjing Institute of TechnologyNanjing 211167China State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004China jiangsu Key Laboratory of Advanced Structural Materials and Application Technology Nanjing 211167China School of Materials Science and Engineering Harbin University of Science and TechnologyHarbin 150080China

A new structural parameter of amorphous alloys called atomic bond proportion was proposed, and a topological algorithm for the structural parameter was proven feasible in the previous work. In the present study, a correction factor, λ,is introduced to optimize the algorithm and dramatically improve the calculation accuracy of the atomic bond *** correction factor represents the ability of heterogeneous atoms to combine with one another to form the metallic bonds and it is associated with the uniformity of the master alloy, mixing enthalpy, cooling rate during preparation, and annealing time. The correction factor provides a novel pathway for researching the structures of the amorphous alloys.

关键词： atomic bond proportion correction factor amorphous materials microstructure

Isothermal oxidation behavior of a new Re-free nickel-based single-crystal superalloy at 950℃

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2017年第8期36卷 617-621页

作者： Xue-Feng Zhou Guang Chen Ya-Ya Feng Zhi-Xiang Qi Min-Zhi Wang Pei Li jia-lin cheng Engineering Research Center of Materials Behavior and Design Ministry of Education Nanjing University of Science and TechnologyNanjing 210094China School of Chemistry and Materials Engineering Changshu Institute of TechnologyChangshu 215500China School of Materials Science and Engineering Nanjing Instituteof TechnologyNanjing 211167China

The isothermal oxidation behavior of a new Refree nickel-based single-crystal superalloy in air at 950 ℃ for 200 h was studied by scanning electron microscopy（SEM）with energy-dispersive spectroscopy（EDS）and X-ray diffraction（XRD）.The results indicate that oxidation kinetics obeys parabolic law approximately,and the mass gain increases rapidly during initial oxidation stage and then gradually slows *** oxidation scales are composed of three layers：the outer layer mainly consists of NiO with a small amount of CoO;the intermediate layer is mainly composed of Cr_2O_3 with a small amount of spinel compounds such as CrTaO_4,NiCr_2O_4,CoCrAl_2O_4,CoAl_2O_4,and NiAl_2O_4;and the inner layer is composed of Al_2O_*** Al_2O_3 layer suppresses the diffusion of elements between oxygen and alloy elements,slows down the alloy oxidation speed,and also suppresses the growth of the oxide scale and reduces the oxidation rate,which is agreeable with the oxidation kinetics.

关键词： Nickel-based single-crystal superalloy Isothermal oxidation Oxidation kinetic Surfacemorphology

Surgical method choice and coincidence rate of pathological diagnoses in transduodenal ampullectomy: A retrospective case series study and review of the literature

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2019年第6期7卷 717-726页

作者： Feng Liu jia-lin cheng Jing Cui Zong-Zhen Xu Zhen Fu Ju Liu Hu Tian Department of General Surgery Shandong Provincial Qianfoshan HospitalShandong University Taishan Medical University Department of Pathology Shandong Provincial Qianfoshan HospitalShandong University Medical Research Center Shandong Provincial Qianfoshan HospitalShandong University

BACKGROUND Transduodenal ampullectomy(TDA) is not in wide clinical use due to its low radical effect and a high recurrence rate of tumors. However,TDA is still an effective treatment method; it has great clinical value in cases of duodenal benign tumors,precancerous lesions,and benign and malignant borderline tumors,and can avoid the risks associated with pancreaticoduodenectomy with larger resection range and greater thoroughness than endoscopic *** To investigate the surgical method choice and the coincidence rate of pathological diagnoses in TDA for ampullary *** Ten patients with ampullary neoplasms underwent TDA based on the fact that their endoscopic biopsy results suggested benign lesions,and the endoscopic ultrasound(EUS)-assessed tumors were resectable. All cases underwent duodenal ampullary lesion endoscopic biopsy,intraoperative frozen-section pathological examination,and postoperative pathological *** study included seven patients with benign tumors and three with malignant tumors(1 pTis,2 pT1),according to the postoperative pathology results. The coincidence rate of the postoperative pathology results with the intraoperative frozen-section biopsy results was 100%(10/10),and the coincidence rate with the endoscopic biopsy results was 70%(7/10) based on pathological *** endoscopic biopsy false-negative rate was 30%(3/10). All patients were followed for 6 to 70 mo without tumor recurrence or *** The coincidence rate of postoperative pathology results,intraoperative frozensection pathology results,and endoscopic biopsy results is the restraining factor of TDA clinical application. Endoscopic biopsy results and EUS have importance relevance to surgical planning. Intraoperative frozen-section pathology results have a significant influence on the choice of surgical procedure.

关键词： Ampulla of Vater Ampullary neoplasm Transduodenal ampullectomy Pathological diagnoses

Unicentric Castleman disease presenting as a retroperitoneal peripancreatic mass:A report of two cases and review of literature

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

World Journal of Gastroenterology 2018年第34期24卷 3958-3964页

作者： jia-lin cheng Jing Cui Yi Wang Zong-Zhen Xu Feng Liu Shu-Bin Liang Hu Tian Taishan Medical University Tai’an 271016Shandong ProvinceChina Department of General Surgery Shandong Provincial Qianfoshan HospitalShandong UniversityJinan 250014Shandong ProvinceChina Department of Pathology Shandong Provincial Qianfoshan HospitalShandong UniversityJinan 250014Shandong ProvinceChina Department of Medical Imaging Shandong Provincial Qianfoshan HospitalShandong UniversityJinan 250014Shandong ProvinceChina

Castleman disease(CD) is a rare disorder of lymph nodes and related tissues. CD generally occurs in the mediastinum, as well as in cervical, retroperitoneal and axillary regions. The disease is classified into two major types: unicentric CD(UCD) and multicentric CD. The occurrence of UCD in the retroperitoneal peripancreatic region is quite rare. We encountered two cases of retroperitoneal peripancreatic UCD in our hospital during the past three years. Following a series of medical examinations, including magnetic resonance imaging, computed tomography, ultrasonography and postoperative histopathological examination, these two patients were diagnosed with UCD,which presented as a retroperitoneal peripancreatic *** mass in each patient was completely excised,and no postoperative radiochemotherapy was *** patients recovered well without recurrence during a follow-up period of 30 mo and 8 mo.

关键词： Unicentric Castleman disease Peripancreatic Retroperitoneal Tumor

Effect of casting methods on microstructure and mechanical properties of ZM5 space flight magnesium alloy

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

China Foundry 2018年第6期15卷 418-421页

作者： Xu-liang Zhang Guo-kang Yu Wen-bing Zou Yan-shuo Ji Ying-zhuo Liu jia-lin cheng Shanghai Spaceflight Precision Machinery Institute Shanghai 201600China School of Materials Engineering Nanjing Institute of TechnologyNanjing 211167China

The counter-gravity casting methods have been developed to remove the casting defects of Mg based alloys. However, the effects of different counter-gravity casting methods on the microstructure and mechanical properties have not been studied in detail. ZM5 alloys were prepared by gravity casting, low-pressure casting and counter-pressure casting, respectively. The mechanical properties, microstructure and fracture morphologies were examined and compared by means of optical microscopy, scanning electron microscopy methods and tensile testing. Results show that casting defects such as gas pore, shrinkage porosity and cavity can be eliminated by counter-pressure casting. The grain size of α-Mg is decreased significantly by counterpressure casting. Moreover, the precipitated particles are more uniform and finer in the counter-pressure casting sample. As a result, the mechanical properties of the alloys are greatly improved. The tensile strength and elongation of the samples by counter-pressure casting are 285 MPa and 13.9%, respectively, which are much higher than those of the low pressure casting and gravity casting.

关键词： counter-pressure casting ZM5 alloy microstructure mechanical properties

A small-dose naloxone infusion alleviates nausea and sedation without impacting analgesia via intravenous tramadol

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2010年第13期123卷 1695-1698页

作者： jia Dong-lin NI cheng XU Ting ZHANG Li-ping GUO Xiang-yang Department of Anesthesiology Peking University Third Hospital Beijing 100191 China

Background Early studies showed that naloxone infusion decreases the incidence of morphine-related side effects from intravenous patient-controlled analgesia. This study aimed to determine whether naloxone preserved analgesia while minimizing side effects caused by intravenous tramadol administration. Methods Eighty patients undergoing general anesthesia for cervical vertebrae surgery were randomly divided into four groups. All patients received 1 mg/kg tramadol 30 minutes before the end of surgery, followed by a continuous infusion with 0.3 mg-kg1.h^-1 tramadol with no naloxone （group I, n=20）, 0.05 μ***.^-1.h^-1 naloxone （group Ⅱ, n=20）, 0.1 ***^-1.h^-1 naloxone （group Ⅲ, n=-20） and 0.2 μ***^-1.h^-1 naloxone （group Ⅳ, n=20）. Visual analog scales （VAS） for pain during rest and cough, nausea five-point scale （NFPS） for nausea and vomiting, and ramsay sedation score （RSS） for sedation were assessed at 2, 6, 12, 24 and 48 hours postoperatively. Analgesia and side effects were evaluated by blinded observers. Results Seventy-eight patients were included in this study. The intravenous tramadol administration provided the satisfied analgesia. There was no significant difference in either resting or coughing VAS scores among naloxone groups and control group. Compared with control group, sedation was less in groups Ⅱ, Ⅲ, and Ⅳ at 6, 12, and 24 hours （P 〈0.05）; nausea was less in groups Ⅱ, Ⅲ and Ⅳ than group I at 2, 6, 12, 24 and 48 hours postoperatively （P 〈0.05）. The incidence of vomiting in the control group was 35% vs. 10% for the highest dose naloxone group （group Ⅳ）（P 〈0.01）. Conclusion A small-dose naloxone infusion could reduce tramadol induced side effects without reversing its analgesic effects.

关键词： tramadol naloxone analgesia nausea sedation

Effect of aeration on fast gas pressure tests

在线全文

学校读者我要写书评

暂无评论

Mining Science and Technology 2009年第6期19卷 756-760页

作者： CHEN Yu-jia jiaNG cheng-lin LI Xiao-wei TANG Jun WANG Chen YANG Fei-long WANG Fa-kai ZHANG Chao-jie DENG Shu-hua School of Safety Engineering China University of Mining ＆ Technology Xuzhou Jiangsu 221008 China

Given the problem of the long time required for testing gas pressure, we propose a fast-test method in which we used a technique of fast borehole sealing and air replenishing. Based on the characteristics of gas emission from boreholes to be tested, we built a theoretical model for calculating parameters during the process of increasing natural pressure and aeration. Using this model, we investigated the effect of different aeration conditions on velocity of pressure tests. The result shows that: 1) aerating air into boreholes can speed up gas pressure tests and 2) the more similar the pressure of the aerated air to the original gas pressure, the smaller the gas volume absorbed by coal and the shorter the time needed in pressure test. A case study in the Lu’an mining area shows that the time needed for gas pressure test is only 4 h using our method of aeration and 29 h under conditions of increasing natural pressure, saving time by 86.2%. This case study also indicates that, by using the aeration method, only one hour is needed for gas pressure to reach a stable state, which breaks the record of the shortest time needed for gas pressure tests in China.

关键词： aeration gas pressure fast test aeration pressure adsorption quantity

Dielectric-ion-conductive ZnNb2O6 layer enabling rapid desolvation and diffusion for dendrite-free Zn metal batteries

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2025年第1期100卷 693-701页

作者： Haifeng Yang jian Wang Panpan Zhang Xiaomin cheng Qinghua Guan Jing Dong Bixian Chen Lujie jia Jing Zhang Yongzheng Zhang Yunjian Liu Hongzhen lin School of Materials Science and Engineering Jiangsu University i-Lab & CAS Key Laboratory of Nanophotonic Materials and Devices Suzhou Institute of Nano-Tech and Nano-Bionics Chinese Academy of Sciences Helmholtz Institute Ulm (HIU) Karlsruhe Institute of Technology (KIT) School of Materials Science and Engineering Xi'an University of Technology State Key Laboratory of Chemical Engineering East China University of Science and Technology

Rechargeable aqueous zinc-metal batteries （AZMBs） are promising candidates for large-scale energy storage systems due to their low cost and high ***,their performance and sustainability are significantly hindered by the sluggish desolvation kinetics at the electrode/electrolyte interface and the corresponding hydrogen evolution reaction where active water molecules tightly participate in the Zn（H2O）62+solvation ***,learnt from self-generated solid electrolyte interphase （SEI） in anodes,the dielectric but ion-conductive zinc niobate nanoparticles artificial layer is constructed on metallic Zn surface （ZNB@Zn）,acting as a rapid desolvation *** zincophilic and dielectric-conductive properties of ZNB layer accelerate interfacial desolvation/diffusion and suppress surface corrosion or dendrite formation,achieving uniform Zn plating/stripping behavior,as confirmed by electronic/optical microscopies and interface spectroscopical measurements together with theoretical ***,the as-prepared ZNB@Zn electrode exhibits excellent cycling stability of over 2000 h and robust reversibility （99.54%） even under high current density and depth of discharge ***,the assembled ZNB@Zn-based full cell displays high capacity-retention rate of 80.21%after 3000 cycles at 5 A g-1and outstanding rate performance up to 10 A *** large-areal pouch cell is stabilized for hundreds of cycles,highlighting the bright prospects of the dielectric but ion-conductive layer in further application of AZMBs.

关键词： Zn metal battery Dielectric artificial layer Rapid ion diffusion Zincophilic diffusion Active water inhibition

EB病毒蛋白BNLF2a阻止抗原转运蛋白TAP的构象变化

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

微生物学通报 2019年第6期46卷 1443-1451页

作者：尹利敏林嘉成福建医科大学基础医学院消化道恶性肿瘤教育部重点实验室肿瘤微生物福建省重点实验室病原生物学系

【背景】EB病毒是一个常见的病原,它能引起霍奇金淋巴瘤、伯基特淋巴瘤以及胃癌、鼻咽癌。该病毒编码的膜蛋白BNLF2a抑制抗原转运蛋白TAP (Transporter associated with antigen processing)从而逃逸T细胞的清除。TAP属于ABC(ATP-bindin... 详细信息

【背景】EB病毒是一个常见的病原,它能引起霍奇金淋巴瘤、伯基特淋巴瘤以及胃癌、鼻咽癌。该病毒编码的膜蛋白BNLF2a抑制抗原转运蛋白TAP (Transporter associated with antigen processing)从而逃逸T细胞的清除。TAP属于ABC(ATP-bindingcassette)转运蛋白超家族,是由TAP1和TAP2两个亚基构成的。TAP通过ATP提供能量,跨膜转运抗原多肽,这一过程伴随着构象变化。【目的】旨在揭示BNLF2a是否影响TAP的构象变化。【方法】TAP蛋白核酸结合结构域的二聚体界面的D-loop进行点突变,引入半胱氨酸。在表达和不表达BNLF2a情况下,采用氧化性的二价铜离子交联半胱氨酸,并通过Westernblot对比TAP的半胱氨酸形成二硫键的比例。【结果】BNLF2a表达使TAP被交联的比例增高。【结论】BNLF2a可能将TAP稳定在核苷酸结合结构域二聚化的构象,从而同时抑制ATP和抗原多肽结合到TAP上来。

关键词： EB病毒 BNLF2a TAP ABC转运蛋白抗原多肽