检索结果-南通市图书馆

Research on Quartz Ceramic Crucible Wastes Applied in Jewelry Casting

在线全文

学校读者我要写书评

暂无评论

Research on Quartz Ceramic Crucible Wastes Applied in Jewelr...

Environmental exposure and flux of thallium by industrial activities utilizing thallium-bearing pyrite

2.11 IEEE International Conference on Waste Recycling,Ecology and Environment(ICWREE 2.11)

作者： Zhifan XU1 yongheng ZHOU1* Shaoxing chen2.Keya SHEN2.Chang CHAN2.1 School of Photo Electronic Science and Technology South{2. Normal university guangzhou china 2.Jewelry Institute of guangzhou Panyu Polytechnic guangzhou china

The method of production of cristobalite was based on the use of quartz ceramic crucible wastes as the basic raw material. The gypsum casting material was prepared by mixing cristobalite powder, gypsum and silica powder. Calorific properties were tested and the results showed that when the content of cristobalite was more than 50% , the gypsum casting material showed obvious cracks, which was removed into the air from resistance furnace at 600℃ after the baking process was over. The gypsum casting material showed better therma crack resistance, when 0.3 g glass fiber were added into per 100 g mixed powder, with the content of cristobalite controlled between 40%-30%. In 300-600℃, about 0.4% thermal expansion occurred which effectively compensated for the cooling contraction of jewelry alloy making the casting sample meet production needs.

关键词： quartz ceramic crucible cristobalite therma expansion jewelry casting

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Science china Earth Sciences 2013年第9期56卷 1502-1509页

作者： chen yongheng {2. ChunLin LIU Juan {2. Jin QI JianYing WU YingJuan Key Laboratory of Waters Safety & Protection in the Pearl River Delta Ministry of EducationGuangzhou University Guangdong Provincial Academy of Environmental Science department of Geosciences Taiwan University South china Institute of Environmental Science Ministry of Environmental Protection

Thallium(Tl) is a typical toxic heavy metal,with higher toxicity to mammals than Hg,Cd,and *** assessments of its environmental exposure and flux are central to effective management and control of Tl *** paper first presents in detail the environmental exposure and flux of Tl by typical industrial activities utilizing Tl-bearing pyrite minerals to produce sulfuric *** this purpose,sequential extraction and Inductively Coupled Plasma Mass Spectrometry(ICP-MS) were used to investigate total content and geo-chemical partitioning of Tl in raw pyrite ores and solid roasting wastes,thereby uncovering Tl distribution and transformation during the production *** showed that some portions of Tl bearing in the minerals went into vapor,which transferred Tl into different processes;and some portions of Tl went into water during the gas washing procedure,leaving some other portions remained in the solid *** importantly,detailed investigation revealed that 40% of Tl in the pyrite minerals was active,among which 2.% of Tl originally in the pyrite minerals was washed into water during gas cleaning process and 15% of active Tl retained in the *** latter portion of active Tl could be possibly transferred to the soil or water with the slag deposal or being reused;and 60% of Tl remained relatively stable in the residual phase.

关键词： Environmental exposure and flux of thallium by industrial activities utilizing thallium-bearing pyrite

Circular RNA circStag1 promotes bone regeneration by interacting with HuR

在线全文

学校读者我要写书评

暂无评论

Bone Research 2022年第3期10卷 565-577页

作者： Gaoyang chen Canling Long Shang wang Zhenmin wang Xin chen Wanze Tang Xiaoqin He Zhiteng Bao Baoyu Tan Jin Zhao yongheng Xie Zhizhong Li Dazhi Yang Guozhi Xiao Songlin Peng department of Spine Surgery and Institute for Orthopaedic Research the Second Clinical Medical College of Jinan University(Shenzhen People’s Hospital)Shenzhen Key Laboratory of Musculoskeletal Tissue Reconstruction and Function RestorationShenzhen 518020China The First Affiliated Hospital Southern University of Science and TechnologyShenzhen 518055China The First Affiliated Hospital Jinan UniversityGuangzhou 510630China School of Medicine Southern University of Science and TechnologyGuangdong Provincial Key Laboratory of Cell Microenvironment and Disease ResearchShenzhen Key Laboratory of Cell MicroenvironmentShenzhen 518055China

Postmenopausal osteoporosis is a common bone metabolic disorder characterized by deterioration of the bone microarchitecture,leading to an increased risk of ***,circular RNAs(circ RNAs)have been demonstrated to play pivotal roles in regulating bone ***,the underlying functions of circ RNAs in bone metabolism in postmenopausal osteoporosis remain ***,we report that circ Stag1 is a critical osteoporosis-related circ RNA that shows significantly downregulated expression in osteoporotic bone marrow mesenchymal stem cells(BMSCs)and clinical bone tissue samples from patients with *** of circ Stag1 significantly promoted the osteogenic capability of ***,we found that circ Stag1 interacts with human antigen R(Hu R),an RNA-binding protein,and promotes the translocation of Hu R into the cytoplasm.A high cytoplasmic level of Hu R led to the activation of the Wnt signaling pathway by stabilizing and enhancing low-density lipoprotein receptor-related protein 5/6(Lrp5/6)andβ-catenin expression,thereby stimulating the osteogenic differentiation of ***,overexpression of circ Stag1 in vivo by circ Stag1-loaded adeno-associated virus(circ Stag1-AAV)promoted new bone formation,thereby preventing bone loss in ovariectomized ***,we show that circ Stag1 plays a pivotal role in promoting the regeneration of bone tissue via Hu R/Wnt signaling,which may provide new strategies to prevent bone metabolic disorders such as postmenopausal osteoporosis.

关键词： metabolism thereby promoted

Synthesis, Antibacterial Activities and Nuclease Properties of Ternary Copper（II） Complex Containing 2.（2.-Pyridyl）benzothiazole and Glycinate

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of chemistry 2012年第2期30卷 303-310页

作者： Lu,Yanmei chen,yongheng ou,Zhibin chen,Shi Zhuang,Chuxiong Le,Xueyi department of Applied chemistry South China Agricultural UniversityGuangzhouGuangdong 510642China College of Life-Science South China Agricultural UniversityGuangzhouGuangdong 510642China Institute of Biomaterial South China Agricultural UniversityGuangzhouGuangdong 510642China

A new ternary complex [Cu（PBT）（Gly）（H2.）]ClO4 （PBT=2.（2.-pyridyl）benzothiazole, and Gly=glycinate） has been synthesized and characterized by elemental analysis, molar conductivity, and IR methods. The complex, structurally characterized by single-crystal X-ray crystallography, shows a slightly distorted square-pyramidal coordination geometry in which two nitrogen atoms of PBT and the carboxylate oxygen atom O and the amino nitrogen atom N of Gly bind at the basal plane, a water molecule is coordinated at the apical position. The complex, Cu（ClO4）2.and flee PBT were each tested for their ability to inhibit the growth of two Gram（--）（Escherichia coil, Salmonella） and two Gram（＋）（Bacillus subtilis, Staphylococcus aureus） microorganisms. The complex showed good antibacterial activities against the microorganisms compared with free PBT and Cu（C104）2. The interaction between the complex and calf thymus DNA in aqueous solution was investigated using electronic spectroscopy, fluorescence spectroscopy, circular dichroic spectroscopy, and viscosity measurements. Results suggest that the complex could bind to DNA by an intercalative mode. In addition, the result of agarose gel electrophoresis showed that the complex can cleave the plasmid DNA by hydroxyl radicals and singlet oxygen-like species under the condition of physiological pH and room temperature.

关键词： copper(II) complex 2.(2.-pyridyl)benzothiazole glycinate DNA antibacterial activity

上腔静脉支架置入术联合DEB-BACE治疗难治性NSCLC合并上腔静脉综合征11例诊治报告

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

国际呼吸杂志 2024年第8期44卷 958-964页

作者：邓屹崔伟许荣德孙元亮陈兢兢崔景华叶苏意陈俞溪陈泳衡李静昆明理工大学附属医院云南省第一人民医院呼吸与危重症医学科昆明650032 南方医科大学附属广东省人民医院(广东省医学科学院)微创介入科广州510080 南方医科大学附属广东省人民医院(广东省医学科学院)呼吸与危重症医学科广州510080

目的:分析11例上腔静脉支架置入术联合载药微球支气管动脉化疗栓塞(DEB-BACE)治疗的难治性非小细胞肺癌(NSCLC)合并上腔静脉综合征(SVCS)患者的诊治情况。方法:本研究为观察性研究,采用非随机抽样的方法选取2.2.年11月至2.2.年4月南方... 详细信息

目的:分析11例上腔静脉支架置入术联合载药微球支气管动脉化疗栓塞(DEB-BACE)治疗的难治性非小细胞肺癌(NSCLC)合并上腔静脉综合征(SVCS)患者的诊治情况。方法:本研究为观察性研究,采用非随机抽样的方法选取2.2.年11月至2.2.年4月南方医科大学附属广东省人民医院微创介入科收治的11例上腔静脉支架置入术联合DEB-BACE治疗的难治性NSCLC合并SVCS患者为研究对象。通过医院电子病历系统收集患者性别、年龄、肿瘤最大径、病理类型、临床分期、临床症状、体征、影像学资料、治疗方案、不良事件等临床资料。观察手术前后的临床表现和影像学表现变化,评估近期疗效和不良事件,通过查阅住院病历、门诊病历或电话随访,随访终点时间为2.2.年5月30日。结果:11例患者中,男9例,女2.;年龄范围38~73岁;肿瘤最大径范围(2.~12.)mm;鳞癌6例,腺癌5例;临床分期Ⅲ期5例,Ⅳ期6例;3例有神经症状,11例有血流动力学症状,10例有呼吸症状;SVCS分级2.7例,3级4例;术前72.h Kishi评分≥4分11例;TypeⅠ型1例,TypeⅡ型1例,TypeⅢ型0例,TypeⅣ型9例;Grade A型0例,Grade B型7例,Grade C型4例。术后72.h,11例患者中4例患者无明显症状体征,5例表现为咳嗽,1例表现为咯血,1例表现为咳嗽伴气促,所有患者均无神经症状和血流动力学症状;SVCS分级均为0级;Kishi评分均降至4分以下。11例患者术前颈部增强CT均提示上腔静脉血流受阻,侧支循环明显,胸部增强CT均可见肺或纵隔占位性病变侵犯上腔静脉,侧支循环明显。所有患者均一次性成功置入上腔静脉支架,技术成功率100%,上腔静脉支架置入术后即刻造影,观察到受累上腔静脉明显扩张,血流通畅。术后1个月复查颈部和胸部增强CT均提示上腔静脉血流通畅,侧支循环减少,仅1例患者肿瘤较前增大,其余患者肿瘤较前缩小或保持不变。术后1个月评估近期疗效,客观缓解率为2..3%,疾病控制率为90.9%。11例患者中仅有1例(9.1%)术后72.h内出现胸痛,为轻度不良事件,予对症处理后胸痛症状缓解。截至随访结束所有患者均支架通畅且生存。结论:上腔静脉支架置入术联合DEB-BACE治疗难治性NSCLC合并SVCS患者,可迅速缓解临床症状,同时还可对原发部位肿瘤进行局部治疗,使肿瘤缩小或保持稳定,从而改善支架通畅和生存情况。

关键词：癌非小细胞肺上腔静脉综合征上腔静脉支架置入术载药微球支气管动脉化疗栓塞血管内操作

Preliminary Study on the Release of Uranium of Uranium Tailings under Simulated Natural Environment Conditions

在线全文

学校读者我要写书评

暂无评论

Preliminary Study on the Release of Uranium of Uranium Taili...

悬浮固化分散液液微萃取-高效液相色谱法测定水体中邻苯二甲酸酯

Environmental Pollution and Public Health(EPPH 2.12.

作者： Zhu Li wang Jin Liu Juan chen {2. Li Hongchun Qi Jianying Fu Shanming Li Xiangping School of Environmental Science and Engineering guangzhou university department of Geosciences National Taiwan University South china Institute of Environmental Science Ministry of Environmental Protection School of chemistry and Chemical Engineering guangzhou {2.

Radioactive and toxic uranium from the open-air uranium tailings dam could enter into aquatic environment due to long-term intermittent leaching and erosion of rain, especially for acid rain, leading to radioactive pollution which endangered the local groundwater and the ecological environment. In this paper, a semi-dynamic leaching test was carried out for studying migration and release characteristics of uranium over a 49 day period. It simulated natural environment conditions in an open system, with variable slag particle sizes, soak time, pH values, aimed to provide theoretical basis for maximizing prevention of uranium into surface water and groundwater. The gross uranium and the release rate of uranium from samples were calculated. The results showed the pH value of solvent and the particle size are the critical factors which influence the uranium lease from the tailings.

关键词： uranium tailings mobile uranium migration and release radioactive pollution

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

色谱 2018年第5期36卷 452-457页

作者：吴翠琴李颖常淑萍陈永亨陈迪云龚剑许良智广州大学环境科学与工程学院珠江三角洲水质安全与保护教育部重点实验室广东省放射性核素污染控制与资源化重点实验室广东广州510006 四川大学华西第二医院妇产科四川成都610041

建立了悬浮固化分散液液微萃取(SFO-DLLME)结合高效液相色谱(HPLC)快速测定水样中6种邻苯二甲酸酯(PAEs)的分析方法。通过对影响萃取效率因素的优化,确定了最佳萃取条件:十二烷醇萃取剂2.μL、萃取温度60℃、离子强度2. g/L、萃取时间1 ... 详细信息

建立了悬浮固化分散液液微萃取(SFO-DLLME)结合高效液相色谱(HPLC)快速测定水样中6种邻苯二甲酸酯(PAEs)的分析方法。通过对影响萃取效率因素的优化,确定了最佳萃取条件:十二烷醇萃取剂2.μL、萃取温度60℃、离子强度2. g/L、萃取时间1 min。6种PAEs在2.2.000μg/L范围内呈良好的线性关系,相关系数(r)为0.999 5~0.999 9,检出限(S/N=3)为0.3~0.6μg/L。对自来水、湖水、江水、污水、海水、市售塑料瓶装纯净水和矿泉水进行测定,能检测到部分PAEs。对加标水样进行回收率试验(10、100和1 000μg/L),6种PAEs的回收率为84.9%~94.5%,相对标准偏差为4.1%~6.8%(n=5)。该法环保、简单,可用于实际水样中6种PAEs的检测分析。

关键词：高效液相色谱分散液液微萃取悬浮固化邻苯二甲酸酯水样

回顾性分析人工全膝关节置换术后早中期胫骨平台骨小梁方向变化

在线全文

学校读者我要写书评

暂无评论

实用医学杂志 2019年第20期35卷 3264-3268页

作者：刘明昊何沛恒刘勇陈伟之叶永恒李伟徐栋梁中山大学附属第一医院关节外科

目的测量在的站立位下肢全长X片中人工全膝关节置换术(total knee arthroplasty,TKA)后早中期胫骨平台假体周围的骨小梁方向,分析其变化规律和机制。方法回顾性分析2.12.6月至2.16年5月于我院进行TKA治疗的病例12.例,收集病例术后、术... 详细信息

目的测量在的站立位下肢全长X片中人工全膝关节置换术(total knee arthroplasty,TKA)后早中期胫骨平台假体周围的骨小梁方向,分析其变化规律和机制。方法回顾性分析2.12.6月至2.16年5月于我院进行TKA治疗的病例12.例,收集病例术后、术后3个月、术后1、3、5年的固定旋转方向站立正位下肢全长X光照片,在所得照片上测量胫骨平台内外侧骨小梁角度、术后下肢力线、胫骨假体力,收集患者年龄、性别、BMI,并进行统计分析。结果病例胫骨平台内侧假体周围骨小梁角度于术后3个月平均减小了5.3°±2.65°,至术后1年平均减小8.3°±3.03°,外侧骨小梁角度于术后3个月平均减小了4.5°±1.71°,至术后1年平均减小7.6°±2.43°,1年后至术后3年、5年并无显著变化。术后下肢力线与胫骨平台内外侧骨小梁角度之间于术后1、3、5年均呈现出弱至中等程度的相关性。结论TKA术后下肢力线的纠正导致了胫骨平台骨小梁方向的改变,术后1年内胫骨平台骨小梁整体向垂直于胫骨假体平台的方向重构。

关键词：人工全膝关节置换术骨小梁方向下肢力线 Wolff定律