检索结果-南通市图书馆

Thermal stability and magnetic properties of Fe–Co–M–Zr–Nb–Ge–B(M=Mo, Cr) bulk metallic glasses

在线全文

学校读者我要写书评

暂无评论

Progress in Natural Science:Materials International 2014年第2期24卷 116-120页

作者： min xu Qunjiao Wang School of Materials and Metallurgy Northeastern University Key Laboratory for Electromagnetic Processing of Materials (ministry of Education) Northeastern University

Fe62Co8 xMxZr6Nb4Ge1B19(M=Mo, Cr) bulk metallic glasses were synthesized in the diameter range up to 2 mm by copper mold casting,which exhibit high thermal stability and large glass-forming ability. The super-cooled liquid region diminishes by the dissolution of Mo. The addition of 2 at% Cr leads to the broading of the liquid region remarkably, resulting in the improvement of thermal stability. The crystallization takes place through a single exothermic reaction, accompanying the precipitation of more than three kinds of crystallized phases such as α-Fe,Fe2Zr and ZrB2. The Fe-based alloys show soft ferromagnetic properties. The saturation magnetization(ss) decreases with increasing Mo or Cr content while the saturated magnetostriction increases with raising Mo or Cr content. There is no evident change in the ssand coercive force(Hc)with annealing temperature below the crystallization temperature, which suggests a more relaxed atomic configuration the glasses have. The crystallization causes a substantial enhancement in both ssand Hc. Each soft magnetic property of the glasses containing Cr with higher thermal stability is superior to that of the alloys containing Mo.

关键词： Bulk metallic glasses Thermal stability Glass-forming ability Crystallization Soft magnetic properties

A NUMERICAL STUDY ON SIDE HULL OPTIMIZATION FOR TRIMARAN

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2011年第2期23卷 265-272页

作者： xu min ZHANG Shi-lian State Key Laboratory of Ocean Engineering Shanghai Jiao Tong University Shanghai 200240 China

Due to the interaction between the main hull and side hulls, different layouts and lengths of side hulls affect the wave loads significantly. Based on three-dimensional potential theory and Green＇s function, this article gives the significant values for wave loads, including vertical shear forces and vertical bending moments at different locations on the main hull, and transverse bending moments at the junction of the cross structure and main hull. In addition, a parametric optimization of wave loads for different layouts and lengths of side hulls were perfomed. Several speeds and wave headings were also considered. Finally, spectral analysis was conducted to attain load distribution. The conclusions of this study are conducive to the design and optimization of this new type of ship

关键词： trimaran three-dimensional potential theory wave loads optimization

The g-Good-Neighbor Conditional Diagnosability of Locally Twisted Cubes

在线全文

学校读者我要写书评

暂无评论

Journal of the Operations Research Society of China 2018年第2期6卷 333-347页

作者： Yu-Long Wei min xu School of Mathematical Sciences Beijing Normal University Laboratory of Mathematics and Complex SystemsMinistry of EducationBeijing 100875China

In the work of Peng et al.(Appl Math Comput 218(21):10406–10412,2012),a new measure was proposed for fault diagnosis of systems:namely g-goodneighbor conditional diagnosability,which requires that any fault-free vertex has at least g fault-free neighbors in the *** this paper,we establish the g-goodneighbor conditional diagnosability of locally twisted cubes under the PMC model and the MM∗model.

关键词： PMC model MM∗model Locally twisted cubes Fault diagnosability

Effect of Gd addition on microstructure and corrosion behaviors of Mg-Zn-Y alloy

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 Magnesium and Alloys 2016年第4期4卷 319-325页

作者： Jinyang Zhang min xu Xinying Teng min Zuo School of Materials Science and Engineering University of JinanNo.336 West Road of Nan XinzhuangJinan 250022China

The Mg_(97-x)Zn_(1)Y_(2)Gd_(x) alloys were prepared by as-casting *** performance of alloys was evaluated by using potentiodynamic polarization,hydrogen evolution rate and mass loss measurements in 3%sodium chloride solution at room *** results shown that the atomic rate of the long period stacking ordered(LPSO)with the composition of Mg_(12)Zn_(1)Y_(1).The microstructure of LPSO phases was lamellar *** the atomic fraction of Zn is 1%and the atomic ratio of Zn/RE(Y,Gd)is 2:5,the volume fraction of LPSO phase can reach the extreme *** corrosion resistance of Mg–Zn–Y alloy improves with the increase of the volume fraction of LSPO *** Mg_(96.5)Zn_(1)Y_(2)Gd_(0.5)(MG0.5)alloy had better corrosion resistance than those of other *** meant that 0.5 at.%gadolinium(Gd)was a suitable addition to Mg_(97)Zn_(2)Y alloy about corrosion resistance.

关键词： Magnesium alloy Gadolinium Microstructure Corrosion

Analysis of good practice of Public Health Emergency Operations Centers

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2015年第8期8卷 665-670页

作者： min xu Shi-xue Li Department of Public Health Shandong University

Objective: To study the public health Emergency Operations Centers(EOCs)in the US, the European Union, the UK and Australia, and summarize the good practice for the improvement of National Health Emergency Response Command Center in Chinese National Health and Family Planning Commission. Methods: Literature review was conducted to explore the EOCs of selected countries. Results: The study focused on EOC function, organizational structure, human resources and information management. The selected EOCs had the basic EOC functions of coordinating and commanding as well as the public health related functions such as monitoring the situation, risk assessment, and epidemiological briefings. The organizational structures of the EOCs were standardized, scalable and flexible. Incident Command System was the widely applied organizational structure with a strong preference. The EOCs were managed by a unit of emergency management during routine time and surge staff were engaged upon emergencies. The selected EOCs had clear information management framework including information collection, assessment and dissemination. Conclusions: The performance of National Health Emergency Response Command Center can be improved by learning from the good practice of the selected EOCs, including setting clear functions, standardizing the organizational structure, enhancing the human resource capacity and strengthening information management.

关键词： Public health Emergency operations center Coordination Command Communication

Dexamethasone prevents vascular damage in earlystage non-freezing cold injury of the sciatic nerve

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Neural Regeneration Research 2016年第1期11卷 163-167页

作者： Hao Li Lei Zhang min xu Department of Neurology the First People’s Hospital of Yibin Department of Pharmacy the First People’s Hospital of Yibin Department of Neurology Xuanwu Hospital Capital Medical University

Non-freezing cold injury is a prevalent cause of peripheral nerve damage, but its pathogenic mechanism is poorly understood, and treatment remains inadequate. Glucocorticoids have anti-inflammatory and lipid peroxidation-inhibiting properties. We therefore examined whether dexamethasone, a synthetic glucocorticoid compound, would alleviate early-stage non-freezing cold injury of the sciatic nerve. We established Wistar rat models of non-freezing cold injury by exposing the left sciatic nerve to cold（3–5°C） for 2 hours, then administered dexamethasone（3 mg/kg intraperitoneally） to half of the models. One day after injury, the concentration of Evans blue tracer in the injured sciatic nerve of rats that received dexamethasone was notably lower than that in the injured sciatic nerve of rats that did not receive dexamethasone; neither Evans blue dye nor capillary stenosis was observed in the endoneurium, but myelinated nerve fibers were markedly degenerated in the injured sciatic nerve of animals that received dexamethasone. After dexamethasone administration, however, endoneurial vasculopathy was markedly improved, although damage to the myelinated nerve fiber was not alleviated. These findings suggest that dexamethasone protects the blood-nerve barrier, but its benefit in non-freezing cold injury is limited to the vascular system.

关键词： nerve regeneration peripheral nerve injury sciatic nerve hypothermia blood-nerve barrier non-freezing cold injury dexamethasone neural regeneration

Periodontally accelerated osteogenic orthodontics with platelet-rich fibrin in an adult patient with periodontal disease:A case report and review of literature

在线全文

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2021年第6期9卷 1367-1378页

作者： min xu Xiao-Yu Sun Jian-Guang xu Stomatological Hospital and College Anhui Medical UniversityHefei 230032Anhui ProvinceChina Department of Orthodontics Anhui Medical UniversityHefei 230032Anhui ProvinceChina

BACKGROUND In the clinical scenario,adult patients with periodontal diseases and dental malformation,characterized by dental crowding in lower anterior teeth with the thin biotype,often require orthodontic *** case report aimed to evaluate the clinical and radiographic outcomes of periodontally accelerated osteogenic orthodontics(PAOO)combined with autologous platelet-rich fibrin(PRF)in an adult patient with class I malocclusion along with dental crowding,a thin periodontal biotype,and buccal plate *** SUMMARY A 32-year-old female complaining of dental crowding and gingival bleeding was referred to the orthodontic *** patient underwent periodontal risk assessment prior to orthodontic *** was diagnosed with a high risk of gingival recession due to dental crowding,root prominence,loss of buccal plates,and a thin gingival tissue *** treatment regimen included PAOO combined with autologous PRF for alveolar augmentation and interproximal enamel reduction for moderate dental ***,PAOO-assisted orthodontic tooth movement in this case showed enhanced periodontium *** outcomes also showed statistically significant improvements(P<0.01)in the mandibular buccal alveolar *** This case report suggests the combination of autologous PRF with PAOO to enhance bone augmentation and long-term tissue support in adult orthodontic patients with periodontal disease.

关键词： Periodontally accelerated osteogenic orthodontics Orthodontic tooth movement Platelet-rich fibrin Bone augmentation Periodontal biotype Case report

Role ofthe IncRNA-p53 regulatory network in cancer

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 Molecular Cell Biology 2014年第3期8卷 181-191页

作者： Ali Zhang min xu Yin-Yuan Mo Division of Hematology/Oncology Northwestern University Feinberg School of Medicine Chicago IL USA Department of 6astroenterology.'Affiliated Hospital of Jiangsu University Zhenjiang 212001 China " Department of Pharmacology/Toxicology and Cancer Institute University of Mississippi Medical Center Jackson MS USA

Advances in functional genomics have led to discovery of a large group of previous uncharacterized long non-coding RNAs （IncRNAs）. Emerging evidence indicates that IncRNAs may serve as master gene regulators through various mechanisms. Dysregulation of IncRNAs is often associated with a variety of human diseases including cancer. Of significant interest, recent studies suggest that IncRNAs participate in the p53 tumor suppressor regulatory network. In this review, we discuss how IncRNAs serve as p53 regulators or p53 effectors. Further characterization of these p53-associated IncRNAs in cancer will provide a better understanding of lncRNA- mediated gene regulation in the p53 pathway. As a result, IncRNAs may prove to be valuable biomarkers for cancer diagnosis or poten- tial targets for cancer therapy.

关键词： p53 IncRNA gene regulation tumor suppressor oncogenes

Electrochemical impedance spectroscopy study on the corrosion of the weld zone of 3Cr steel welded joints in CO_2 environments

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of minerals,Metallurgy and Materials 2015年第5期22卷 500-508页

作者： Li-ning xu Jin-yang Zhu min-xu Lu Lei Zhang Wei Chang Corrosion and Protection Center Key Laboratory for Environmental Fracture (MOE) Institute for Advanced Materials and Technology University of Science and Technology Beijing CNOOC Research Institute

The welded joints of 3Cr pipeline steel were fabricated with commercial welding wire using the gas tungsten arc welding （GTAW） technique. Potentiodynamic polarization curves, linear polarization resistance （LPR）, electrochemical impedance spectroscopy （EIS）, scan- ning electron microscopy （SEM）, and energy-dispersive spectrometry （EDS） were used to investigate the corrosion resistance and the growth of a corrosion film on the weld zone （WZ）. The changes in electrochemical characteristics of the film were obtained through fitting of the EIS data. The results showed that the average corrosion rate of the WZ in CO2 environments first increased, then fluctuated, and finally de- creased gradually. The formation of the film on the WZ was divided into three stages： dynamic adsorption, incomplete-coverage layer forma- tion, and integral layer formation.

关键词： petroleum pipelines steel corrosion welded joints carbon dioxide electrochemical impedance spectroscopy