检索结果-南通市图书馆

Acta metallurgica Sinica(English Letters) 2000年第4期13卷 967-973页

作者： Ji, h.B. Xia, L.F. ma, X.X. Sun, Y. Sun, m.R. harbin Inst of Technology Harbin China

The surface properties of Ti-6Al-4V alloy coated with titanium nitride, TiN+TiC+Ti(C,N)/DLC (diamond like carbon), TiN/DLC and TiC/DLC films by plasma-based ion implantation (PBII) with nitrogen, PBII with nitrogen then acetylene, PBII with nitrogen then glow discharge deposition with acetylene plus hydrogen and PBII with acetylene then glow discharge deposition with acetylene plus hydrogen respectively were studied. The corresponding films are found getting dimmer, showing light gold or gold, smoky color (uneven), light red in black (uneven), and graphite black separately. The corresponding film resistivities are given. Antioxidation ability of the titanium nitride film is poor, while the existence of carbon (or carbide) improves the antioxidation ability of the films. having undergone excellent intermediate transitional region of nitrogen and carbon implantation, the top DLC layer of the TiN+TiC+Ti(C,N)/DLC multilayer are formed after the carbon implantation has the best adhesion with the substrate among all the multilayers. Although microhardness of the samples increases in the order of coatings of titanium nitride, TiN/DLC, TiN+TiC+Ti(C,N)/DLC and TiC/DLC, the TiN/DLC and TiC/DLC multilayers have greater brittleness as compared with other films.

关键词： Titanium alloys Titanium nitride Plasmas Ion implantation microhardness Surface properties

肺毛霉菌病:CT动态形态学改变与临床和病理结果的相关性研究

在线全文

学校读者我要写书评

暂无评论

国际医学放射学杂志 2018年第2期 247-248页

作者： B.Da K.T.Jung L.K.Soo K.T.Sung h.Joungho C.m.Jin 吴准 Department of Radiology and Centre for Imaging Science Samsung Medical Centre Sungkyunkwan University School of Medicine

摘要目的评估肺毛霉菌病动态CT征象与外周血中性粒细胞绝对计数(ANC)的相关性。材料与方法于1997年2月—2016年6月间,共纳入20例经组织病理学诊断为肺毛

关键词：肺毛霉菌病形态学改变 ANC CT

Simulation Experiment of Loading Influence to Reinforcement Corrosion Affected by Stray Current and Salt Solution

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

武汉理工大学学报 2010年第17期32卷 147-151页

作者： TENG h W YANG S m ShU Z C hUANG Y hUO D College of Architecture and Civil Engineering Beijing University of TechnologyBeijing 100124China Beijing Key Lab of Earthquake Engineering and Structural Retrofit Beijing University of TechnologyBeijing 100124China

According to the service environment of subway structure,experiment is carried out to simulate influence of different loading levels to reinforcement corrosion of R.C element affected by stray current and chlorine salt solution. The current density of the corrosion is measured with the linear polarization resistance method,together with the qualitative analysis and quantitative calculation. Experiment shows that rebar corrosion current density increase accordingly with the increase of loading level. The quantitative relations and the time of rust corrosion of reinforcement are obtained.

关键词： reinforcement corrosion stray current chloride ion solution loading level simulation experiment

hIGh-CURRENT PULSED ELECTRON BEAm: RAPID SURFACE ALLOYING AND WEAR RESISTANCE ImPROVEmENT

在线全文

学校读者我要写书评

暂无评论

Acta metallurgica Sinica(English Letters) 2003年第4期16卷 276-282页

作者： J.Xu h.W.Liu Z.R.Zhou C.Dong A.m.Wu S.Z.hao A.m.Zhang T.Xu TribologyResearchInstitute SouthwestJiaotongUniversityChengdu610031ChinaManuscriptreceived25November2002 StateKeyLab.formaterialsmodificationbyLaser IonandElectronBeamsDalianUniversityofTech-nologyDalian116024China StateKeyLaboratoryofSolidLubrication LanzhouInstituteofChemicalPhysicsTheChineseAcademyofSciencesLanzhou730000China

The present paper reports the rapid surface alloying induced by the bombardment of high-current pulsed electron beam. Two kinds of substrate materials were examined to show this effect. The first sample was a pure Al metal pre-coated with fine carbon powders prior to the bombardment, and the second alloy is the D2-Crl2molVl mould steel pre-coated with Cr, Ti, and TiN powders. The surface elements diffuse about several micrometers into the substrate materials only after several bombardments. Tribological behaviors of these samples were characterized and significant improvement in wear resistance was found. Finally, a TEm analysis reveals the presence of stress waves generated by coupled thermal and stress fields, which was considered as the main cause of the enhanced properties.

关键词： high-current pulsed electron beam surface alloying tribology fretting wear

Synthesis and reactions of some 6-aryl and 2,6-diaryl-4-(4'-antipyrinyl)-2,3,4,5-tetrahydropyridasin-3-ones and screening for their antibacterial activities

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemistry 1992年第5期10卷 475-480页

作者： SAYED G. h. ShIBA S. A. RADWAN A. m.h.mED S. m. KhALIL m. Chemistry Department Faculty of Science Ain Shams University Abbassia Cairo Egypt Al-Azhar University for Girls Abbassia Cairo Egypt

Some new pyridazinone derivatives(3) were synthesized through addition of antipyrin to β- aroylacrylic acids (1) followed by cyclization of the adducts. Reactions of 3 with ethyl bromoacetate, benzenesulfonyl chloride, benzoyl chloride and POCl_3 give N-substituted products and monochlorosub- stituted pyridazines (4), respectively. The reactions of the latter with thiourea give unexpected dithio- derivatives(5), which react with phenylhydrazine to give pyrazolopyridazino pyridazine derivatives (6). Reactions of 2 with Nh_2Oh in ethanol and pyridine afford oxime and oxazinone derivatives 7 and 8, tespectively. The antibacterial activities of several compounds were screened.

关键词： antipyrinyl tetrahydropyridasin-3-ones and screening for their antibacterial activities Synthesis and reactions of some 6-aryl and 2,6-diaryl-4

cT1a肾细胞癌的经皮微波消融与腹腔镜肾部分切除术:一项1955例病人的倾向性配对队列研究

在线全文

学校读者我要写书评

暂无评论

国际医学放射学杂志 2020年第3期 361-362页

作者： J.Yu X.Zhang h.Liu R.m.Zhang X.L.Yu Z.G.Cheng 王艾博 Department of Interventional Ultrasound State Key Laboratory of Kidney Disease and Department of Urology Surgery Chinese PLA General Hospital

摘要经皮微波消融(mWA)和腹腔镜肾部分切除术(LPN)是早期低侵袭性肾细胞癌(RCC)的2种治疗方法。目的比较经皮mWA与LPN治疗cT1a肾细胞癌的远期疗效。

关键词：

In vitro α-amylase inhibitory activity and in vivo hypoglycemic effect of methanol extract of Citrus macroptera ***

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Biomedicine 2014年第6期4卷 473-479页

作者： Nizam Uddin Rakib hasan monir hossain Arjyabrata Sarker A.h.m.Nazmul hasan A.F.m.m.h.udul Islam m.h..motaher h.Chowdhury Sohel Rana Laboratory of Natural Products Research Department of PharmacyJahangirnagar University

Objective:To investigate the therapeutic effects of methanol extract of Citrus macroptera montr,fruit inα-amylase inhibitory activity(in vitro)and hypoglycemic activity in normal and glucose induced hyperglycemic rats(in vivo).methods:Fruits of Citrus macroptera without rind was extracted with pure methanol following cold extraction and tested for presence of phytochemical constituents,α-amylase inhibitory activity,and hypoglycemic effect in normal rats and glucose induced hyperglycemic ***:Presence of saponin,steroid and terpenoid were identified in the *** results showed that fruit extract had moderateα-amylase inhibitory activity[IC_(50)value=(3.638±0.190)mg/mL]as compared to *** at 500 mg/kg and 1000 mg/kg doses fruit extract significantly(Pmal rats as compared to glibenclamide(5 mg/kg).In oral glucose tolerance test,500 mg/kg dose significantly reduced blood glucose level(Ph but 1000 mg/kg dose significantly reduced blood glucose level at 2 h and 3 h(Phereas glibenclamide(5 mg/kg)significantly reduced glucose level at every hour after *** time effect is also considered extremely significant with F value=23.83 and P value=0.0001 in oral glucose tolerance ***:These findings suggest that the plant may be a potential source for the development of new oral hypoglycemic agent.

关键词： Diabetes mellitus hypoglycemic Citrus macroptera α-Amylase OGTT Glibenclamide

心脏电影mRI评估左心室长轴功能为射血分数减少病人全因死亡率的独立预测因素:一项多中心研究

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

国际医学放射学杂志 2018年第2期 224-225页

作者： S.Romano R.m.Judd R.J.Kim.h.W.Kim I.Klem J.F.heitner 俞翔 Division of Cardiology Department of Medicine University of Illinois at Chicago

摘要目的本多中心研究旨在通过心脏电影mRI评估左心室(LV)长轴功能的一项简单指标——外侧二尖瓣平面收缩位移(mAPSE)评价射血分数(EF)减少病人预后的价值。

关键词： mRI 左心室全因死亡射血分数多中心研究预测因素

重症COVID-19病人的临床特征和胸部CT影像特征

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

国际医学放射学杂志 2021年第1期44卷 117-118页

作者： N.Zhang X.Xu L.Y.Zhou G.Chen Y.Li h.m.Yin 刘晓斌

摘要目的比较确诊为新型冠状病毒(COVID-19)重症病人中生存和死亡病例的临床、实验室和胸部CT检查结果。方法回顾分析60例患有COVID-19肺炎的重症病人,包括

关键词：

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

甲烷预混气螺旋爆轰的定量不稳定性研究

工程科学学报 2016年第11期38卷 1522-1531页

作者：赵焕娟 John h.S.LEE 张英华北京科技大学土木与资源工程学院北京100083 麦吉尔大学机械工程系

针对Ch_4这种特别气体,对其实验结果运用数字化处理方法研究Ch_4稳定性.在内径50.8 mm圆形管道内获得Ch_4+2O_2预混气在不同初始压力条件下的胞格爆轰结果并使用烟膜记录,且测得的平均爆轰速度数据与CJ爆轰速度接近,在初始压力高于5 k P... 详细信息

针对Ch_4这种特别气体,对其实验结果运用数字化处理方法研究Ch_4稳定性.在内径50.8 mm圆形管道内获得Ch_4+2O_2预混气在不同初始压力条件下的胞格爆轰结果并使用烟膜记录,且测得的平均爆轰速度数据与CJ爆轰速度接近,在初始压力高于5 k Pa时爆轰可稳定传播.烟膜上形成的三波点轨迹十分不规则.为减少人为误差,使用改进后的数字化处理烟膜图像的技术方法,从烟膜轨迹中得出柱状图及自相关函数结果,发现Ch_4+2O_2是一种爆轰十分不稳定的气体,并给出Ch_4+2O_2预混气的爆轰胞格尺寸及差距,结果显示人为测量结果偏大而数字化处理方法更为准确.这种方法能计算Ch_4+2O_2预混气胞格尺寸及不稳定度,完善了定量化预混气不稳定程度的方法.

关键词：甲烷爆轰定量分析不规则性图像处理自相关