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Alteration and mineralization styles of the orogenic disseminated Zhenyuan gold deposit,southeastern Tibet: Contrast with carlin gold deposit 预览
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作者 Huajian Li Qingfei Wang +3 位作者 Jun Deng Lin Yang Chaoyi Dong Huazhi Yu 《地学前缘:英文版》 CAS CSCD 2019年第5期1849-1862,共14页
Orogenic disseminated and Carlin gold deposits share much similarity in alteration and mineralization.The disseminated orogenic Zhenyuan Au deposit along the Ailaoshan shear zone,southeastern Tibet,was selected to cla... Orogenic disseminated and Carlin gold deposits share much similarity in alteration and mineralization.The disseminated orogenic Zhenyuan Au deposit along the Ailaoshan shear zone,southeastern Tibet,was selected to clarify their difference.The alteration and mineralization from the different lithologies,including meta-quartz sandstone,carbonaceous slate,meta-(ultra)mafic rock,quartz porphyry and lamprophyre were researched.According to the mineral assemblage and replacement relationship in all types of host rocks,two reactions show general control on gold deposition:(1) replacement of earlier magnetite by pyrite and carbonaceous material;(2) alteration of biotite and phlogopite phenocrysts in quartz porphyry and lamprophyre into dolomite/ankerite and sericite.Despite the lamprophyre is volumetrically minor and much less fractured than other host rocks,it contains a large portion of Au reserve,indicating that the chemically active lithology has played a more important role in gold precipitation compared to structure.LA-ICP-MS analysis shows that Au mainly occurs as invisible gold in fine-grained pyrite disseminated in the host rocks,with Au content reaching to 258.95 ppm.The diagenetic core of pyrite in meta-quartz sandstone enriched in Co,Ni,Mo,Ag and Hg is wrapped by hydrothermal pyrite enriched in Cu,As,Sb,Au,Tl,Pb and Bi.Different host rock lithology has much impact on the alteration and mineralization features.Carbonate and sericite in altered lamprophyre show they have higher Mg than those developed in other of host rocks denoting that the carbonate and sericite incorporated Mg from phlogopite phenocrysts in the primary lamprophyre during alteration.The ore fluid activated the diagenetic pyrite in meta-quartz sandstone leading the hydrothermal pyrite enriched in Cu,Mo,Ag,Sb,Te,Hg,Tl,Pb and Bi,but the hydrothermal pyrite in meta-(ultra)mafic rock is enriched in Co and Ni as the meta-(ultra)mafic rock host rock contain high content of Co and Ni.However,Au and As shear similar range in both types of host rocks i 展开更多
关键词 Zhenyuan GOLD DEPOSIT DISSEMINATED OROGENIC GOLD DEPOSIT Host-rock ALTERATION Mineralization style Carlin GOLD DEPOSIT
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造锍熔炼富集含砷难处理金矿中金的研究 预览
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作者 杨天足 卢一帆 +3 位作者 张杜超 刘伟锋 陈霖 令红斌 《贵金属》 CAS CSCD 北大核心 2019年第2期5-11,共7页
在含砷难处理金矿中添加氧化铜造锍熔炼,将金和银富集在铜锍中。通过单因素实验法研究了造锍熔炼过程中主要元素的行为,得到造锍熔炼的最佳条件为:质量比m(CaO)/m(SiO2)=0.5、m(FeO)/m(SiO2)=2.0,物料中铜的总含量为5%,熔炼温度为1300℃... 在含砷难处理金矿中添加氧化铜造锍熔炼,将金和银富集在铜锍中。通过单因素实验法研究了造锍熔炼过程中主要元素的行为,得到造锍熔炼的最佳条件为:质量比m(CaO)/m(SiO2)=0.5、m(FeO)/m(SiO2)=2.0,物料中铜的总含量为5%,熔炼温度为1300℃,保温时间为60 min,此时金银在铜锍中得到有效富集。金在锍相中的品位为78.3 g/t,回收率可达到99.98%;锍相中铜的回收率为98.64%;渣相中砷和硫含量都很低。物相分析表明铜锍相中的铜和铁主要是以CuFeS2、FeS、Cu2S和Cu存在,对金具有富集作用。 展开更多
关键词 黄金 含砷难处理金矿 造锍熔炼 低品位铜锍
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硫代硫酸盐回收废弃印刷线路板中金的研究新进展 预览
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作者 傅开彬 汤鹏成 +3 位作者 秦天邦 徐信 侯兰杰 莫晓兰 《应用化工》 CAS CSCD 北大核心 2019年第8期1994-1999,共6页
查明WPCBs中金赋存特点、硫代硫酸盐浸金的原理和WPCBs中金的硫代硫酸盐浸出及其回收研究现状,能更好地为硫代硫酸盐回收WPCBs中金的应用发展指明方向。研究表明,WPCBs中金主要有以电触点材料、导电材料、金基焊料和电子浆料等金属形态... 查明WPCBs中金赋存特点、硫代硫酸盐浸金的原理和WPCBs中金的硫代硫酸盐浸出及其回收研究现状,能更好地为硫代硫酸盐回收WPCBs中金的应用发展指明方向。研究表明,WPCBs中金主要有以电触点材料、导电材料、金基焊料和电子浆料等金属形态存在;硫代硫酸盐浸金体系以O2为氧化剂、S2O3^2-为配位基、Cu^2+和NH4^+作为催化剂,Cu(NH3)4^2+既是氧传输载体,也是金氧化还原的关键,S2O3^2-为亚稳态的物质,易与溶液中其他离子反应,导致溶液成份复杂;为减小其他金属对后续金浸出的影响,应先脱除WPCBs中铜、铁和铝等;硫代硫酸盐浸金体系主要有“Na2S2O3+Cu^2+”、“(NH4)2S2O3+Cu^2+”和“S2O3^2-+NaCl”等三类。从硫代硫酸盐浸金液中回收金的方法有置换沉淀法、树脂吸附法、活性炭吸附法、微生物吸附法、溶剂萃取法、液膜分离法和电积冶金法等。 展开更多
关键词 硫代硫酸盐 废弃印刷线路板 赋存状态 浸金原理
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黄金战略重要性的变化与展望 预览
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作者 王寿成 王京 《中国国土资源经济》 2019年第5期33-37,共5页
从黄金在国际货币体系变革中的战略地位演变看,随着美元的衰落、人民币国际化进程的加速,未来将形成几种货币相互制衡的局面,各国央行为自己的货币信用背书而显著增持黄金,表明信用货币制度下黄金的货币属性仍然没有消失,黄金的战略重... 从黄金在国际货币体系变革中的战略地位演变看,随着美元的衰落、人民币国际化进程的加速,未来将形成几种货币相互制衡的局面,各国央行为自己的货币信用背书而显著增持黄金,表明信用货币制度下黄金的货币属性仍然没有消失,黄金的战略重要性凸显。黄金矿产的勘查开发对黄金储备有着重要的作用。增加我国黄金储量和产量、实现我国黄金全球配置是一种储金于民,储金于国的策略。并且提升我国在全球金融体系中的实力,需要强有力的黄金战略——加强黄金储备与黄金矿产勘查开发,这也是维护国家经济、金融安全的手段之一。 展开更多
关键词 黄金 国际货币体系 黄金战略性
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Triazole-gold (TAAu) catalyzed three-component coupling (A3 reaction) towards the synthesis of 2,4-disubstituted quinoline derivatives
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作者 Fusong Zhang Qi Lai +1 位作者 Xiaodong Shi Zhiguang Song 《中国化学快报:英文版》 SCIE CAS CSCD 2019年第2期392-394,共3页
A gold-catalyzed three-component coupling reaction (A3 reaction) was developed as an efficient approach for the synthesis of challenging 2, 4-disubstituted quinoline derivatives. Compared to previously reported Cu/Au ... A gold-catalyzed three-component coupling reaction (A3 reaction) was developed as an efficient approach for the synthesis of challenging 2, 4-disubstituted quinoline derivatives. Compared to previously reported Cu/Au bi-catalyst system, this protocol enables achieving A3 reaction only in the presence of triazole-gold catalyst. Notably, 4-alkyl substituted or 2-alkyl substituted quinoline derivatives were obtained with good yields, which highlighted the unique advantage of this new strategy. 展开更多
关键词 QUINOLINE Gold CATALYSIS A3 REACTION Triazole-gold
慢性阻塞性肺疾病稳定期中医证候分布规律与GOLD2017综合评估的相关性探讨 被引量:1
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作者 吴孝政 王振兴 +1 位作者 刘丽耘 王飞 《辽宁中医杂志》 CAS 2019年第3期562-566,共5页
目的:探讨慢性阻塞性肺疾病(COPD)稳定期GOLD2017综合评估与证候分布规律的关系。方法:收集2017年6月-2018年1月期间COPD稳定期患者共189例,调查其一般资料并进行GOLD2017分级,统计分析COPD稳定期GOLD2017分级与证候分布之间的关系。结... 目的:探讨慢性阻塞性肺疾病(COPD)稳定期GOLD2017综合评估与证候分布规律的关系。方法:收集2017年6月-2018年1月期间COPD稳定期患者共189例,调查其一般资料并进行GOLD2017分级,统计分析COPD稳定期GOLD2017分级与证候分布之间的关系。结果:189例患者13种证候,以虚证居多。虚证类证候以肺肾气虚(17. 96%)和肺脾肾气虚(15. 87%)最多,实证类证候以痰瘀阻肺(15. 87%)、血瘀证(13. 47%)和痰湿阻肺(12. 57%)最多。肺气虚证患者CAT较低、m MRC较低,急性发作次数少,综合评估分布于各组;肺脾气虚证患者CAT增高、m MRC增高,急性发作次数相对增多,综合评估主要分布于B组和D组;肺肾气虚、肺脾肾气虚、阳虚水泛证患者CAT高、m MRC高,急性发作次数多,综合评估主要分布于D组;肺肾气阴两虚患者CAT高、急性发作次数多,虽然m MRC相对肺脾气虚稍低,但综合评估主要分布于D组。5组实证类患者虽然CAT、m MRC,急性发作次数,各有不同,总体以痰湿阻肺、痰热壅肺证较低,痰瘀阻肺、血瘀证、痰热瘀肺证较高,但综合评估都主要集中在D组;兼夹血瘀的患者明显在各类评估中高于兼夹痰湿、痰热的患者;痰热壅肺证患者综合评估差异不明显。结论:肺气虚贯穿于COPD稳定期的始终,症状相对较少,风险小,预后相对较好,但亦会出现明显加重趋势;肺脾气虚证患者症状较多,急性加重次数相对较多,提示风险相对较高,如不积极控制预后不佳;肺肾气虚、肺脾肾气虚、阳虚水泛、肺肾气阴两虚证患者患者病情重,风险高,预后不佳;脾气虚、肾气虚是影响病情严重程度的关键因素。兼夹痰湿、血瘀、热邪各类实邪的患者,都有临床症状加重、呼吸困难程度加重、急性发作增多的趋势,患者病情重,风险高,预后不佳;血瘀是影响病情严重程度的主要兼夹因素;痰热壅肺证病情严重程度不明显,有可能是患者病情加重的始动因 展开更多
关键词 慢性阻塞性肺疾病 稳定期 GOLD 综合评估 证候分布
Geological and geochemical characteristics of the Baogudi Carlintype gold district(Southwest Guizhou, China) and their geological implications
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作者 Songtao Li Yong Xia +9 位作者 Jianzhong Liu Zhuojun Xie Qinping Tan Yimeng Zhao Minghua Meng Lijin Tan Rong Nie Zepeng Wang Guanghong Zhou Haiyan Guo 《中国地球化学学报:英文版》 EI CAS CSCD 2019年第4期587-609,共23页
The newly discovered Baogudi gold district is located in the southwestern Guizhou Province,China,where there are numerous Carlin-type gold deposits.To better understand the geological and geochemical characteristics o... The newly discovered Baogudi gold district is located in the southwestern Guizhou Province,China,where there are numerous Carlin-type gold deposits.To better understand the geological and geochemical characteristics of the Baogudi gold district,we carried out petrographic observations,elemental analyses,and fluid inclusion and isotopic composition studies.We also compared the results with those of typical Carlin-type gold deposits in southwestern Guizhou.Three mineralization stages,namely,the sedimentation diagenesis,hydrothermal(main-ore and late-ore substages),and supergene stages,were identified based on field and petrographic observations.The main-ore and late-ore stages correspond to Au and Sb mineralization,respectively,which are similar to typical Carlin-type mineralization.The mass transfer associated with alteration and mineralization shows that a significant amount of Au,As,Sb,Hg,Tl,Mo,and S were added to mineralized rocks during the main-ore stage.Remarkably,arsenic,Sb,and S were added to the mineralized rocks during the late-ore stage.Element migration indicates that the sulfidation process was responsible for ore formation.Four types of fluid inclusions were identified in ore-related quartz and fluorite.The main-ore stage fluids are characterized by an H2O–NaCl–CO2–CH4±N2system,with medium to low temperatures(180–260℃)and low salinity(0–9.08%NaCl equivalent).The late-ore stage fluids featured H2O–NaCl±CO2±CH4,with low temperature(120–200℃)and low salinity(0–7.48%Na Cl equivalent).The temperature,salinity,and CO2and CH4concentrations of ore-forming fluids decreased from the main-ore stage to the late-ore stage.The calculated δ^13C,d D,and δ^18O values of the ore-forming fluids range from-14.3 to-7.0%,-76 to-55.7%,and 4.5–15.0%,respectively.Late-ore-stage stibnite had δ^34S values ranging from-0.6 to 1.9%.These stable isotopic compositions indicate that the ore-forming fluids originated mainly from deep magmatic hydrothermal fluids,with minor contributions from strata.Collec 展开更多
关键词 ELEMENTAL geochemistry Fluid inclusions Stable isotopes CARLIN-TYPE GOLD deposits Baogudi GOLD DISTRICT SOUTHWESTERN GUIZHOU
粤海关与晚清宫廷的购金
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作者 滕德永 《中国经济史研究》 CSSCI 北大核心 2019年第1期146-155,共10页
咸丰朝始,清宫既有的黄金来源因战争而中断。至同治朝,为了满足宫中用金需要,内务府令粤海关购金,解交宫中应用。由此,粤海关成为晚清宫廷黄金最为重要的来源。粤海关购金被广泛地用于宫中敬神、后妃分例等,更为重要的则是制作各项礼器... 咸丰朝始,清宫既有的黄金来源因战争而中断。至同治朝,为了满足宫中用金需要,内务府令粤海关购金,解交宫中应用。由此,粤海关成为晚清宫廷黄金最为重要的来源。粤海关购金被广泛地用于宫中敬神、后妃分例等,更为重要的则是制作各项礼器,维系了各项典礼制度。因购金价格高昂,粤海关承受了巨大的经济压力,这是晚清被卷入世界经济的结果。 展开更多
关键词 粤海关 黄金 晚清 宫廷 金器
Geochronology and Geochemistry of the Granites from the Longtoushan Hydrothermal Gold Deposit in the Dayaoshan Area,Guangxi:Implication for Petrogenesis and Mineralization
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作者 Lihua Qian Jianqing Lai +3 位作者 Lifang Hu Rong Cao Shilong Tao Bei You 《地球科学学刊:英文版》 SCIE CAS CSCD 2019年第2期309-322,共14页
The gold mineralization in the Longtoushan hydrothermal gold deposit is concentrated within the contact zone of the granitic complex. Whole rock geochemistry and in-situ U-Pb and Hf isotopic data were used to constrai... The gold mineralization in the Longtoushan hydrothermal gold deposit is concentrated within the contact zone of the granitic complex. Whole rock geochemistry and in-situ U-Pb and Hf isotopic data were used to constrain the genesis and age of the granites and related Cu-Au mineralization in the Longtoushan Deposit. The granites mainly consist of the granite porphyry, rhyolite porphyry, porphyritic granite and quartz porphyry. LA-ICP-MS U-Pb dating of zircons from the granite porphyry, rhyolite porphyry and quartz porphyry indicates that they intruded from ca. 94 to 97 Ma. These intrusions exhibit similar trace element characteristics, i.e., right-dipping REE patterns, depletion of Ba, Sr, P and Ti, and enrichment of Th, U, Nd, Zr and Hf. The εHf(t) values of zircons from the granite porphyry, rhyolite porphyry and quartz porphyry range from-26.81 to-8.19,-8.12 to-5.33, and-8.99 to-5.83, respectively, suggesting that they were mainly derived from the partial melting of the Proterozoic crust. The Cu-Au mineralization is mainly related to the rhyolite porphyry and porphyritic granite, respectively. The Longtoushan granites were most likely formed in a post-collisional extensional environment, and the deposit is a part of the Late Yanshanian magmatism related mineralization in the Dayaoshan area and its adjacent areas. 展开更多
关键词 Longtoushan gold deposit RHYOLITE PORPHYRY zircon U-Pb dating Hf ISOTOPES PETROGENESIS CU-AU mineralization
选铜含氰废水处理试验研究 预览
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作者 王彦隽 张志刚 贾丽 《黄金》 CAS 2019年第3期80-82,共3页
为实现选铜含氰废水的达标排放,以及有价金属的回收,采用过氧化氢氧化—改性活性炭吸附法进行处理,并对试验条件进行了优化。结果表明:在p H=10、过氧化氢用量25 m L/L、搅拌速度200 r/min、反应时间120 min,改性活性炭用量20 g/L的最... 为实现选铜含氰废水的达标排放,以及有价金属的回收,采用过氧化氢氧化—改性活性炭吸附法进行处理,并对试验条件进行了优化。结果表明:在p H=10、过氧化氢用量25 m L/L、搅拌速度200 r/min、反应时间120 min,改性活性炭用量20 g/L的最佳条件下,氰化物去除率高达99. 91%,铜去除率达98. 83%,金回收率95. 56%,载金炭金品位0. 022 mg/g。该研究有效解决了水循环利用'疲劳'问题,为工业应用提供参考。 展开更多
关键词 含氰废水 过氧化氢 改性活性炭 去除率
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甘肃省合作市德合山金矿地质特征及找矿标志 预览
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作者 曹成雁 《世界有色金属》 2019年第7期57-58,共2页
德合山金矿处在夏河-合作金铜成矿带。区内AuAsSbAg组合异常及控矿断裂构造发育。圈定金矿体6条,矿体控制程度低。目前部分化探异常尚未查证,具有一定找矿潜力。
关键词 德合山 金矿 地质特征 找矿标志
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富贵锑控电位氯化浸出选择性分离贱金属 预览
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作者 刘伟锋 刘好男 +3 位作者 孙百奇 陈霖 张杜超 杨天足 《中国有色金属学报》 EI CAS CSCD 北大核心 2019年第2期396-403,共8页
为实现从富贵锑中富集提取金的目的,提出采用控电位氯化浸出方法选择性分离富贵锑中贱金属。详细考察了各因素对贱金属浸出率的影响,查明了最优条件下贵金属的溶解行为,采用富贵锑粉置换回收浸出液中的贵金属。结果表明:提高盐酸浓度、... 为实现从富贵锑中富集提取金的目的,提出采用控电位氯化浸出方法选择性分离富贵锑中贱金属。详细考察了各因素对贱金属浸出率的影响,查明了最优条件下贵金属的溶解行为,采用富贵锑粉置换回收浸出液中的贵金属。结果表明:提高盐酸浓度、增加液固比、提高反应温度和减小双氧水的加入速度均可以提高贱金属的浸出率;但增大双氧水过量系数会导致金属氧化沉淀。在最优条件下,铜、镍、锑和铅的浸出率均大于99.0%,金和银的浸出率分别为0.16%和84.40%,浸出渣中金含量达到96.0%。浸出液冷却结晶过程会析出氯化铅,金和银的置换率均达到99.0%以上。该方法实现了富贵锑中贱金属有效分离和金高效富集的双重目的。 展开更多
关键词 富贵锑 氯化浸出 控电位 贱金属
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SiO2负载Au-Pd双金属纳米颗粒催化甲醇选择性氧化合成甲酸甲酯 预览
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作者 武建兵 师瑞萍 +5 位作者 秦张峰 刘欢 李志凯 朱华青 赵永祥 王建国 《燃料化学学报》 EI CAS CSCD 北大核心 2019年第7期780-790,I0001共12页
甲醇选择氧化制备甲酸甲酯(MF)是延伸甲醇产业链、开发高附加值下游产品的有效途径之一,负载型Au及Pd催化剂在这一反应中表现出优异的低温催化性能。为探索实用、高效和易再生的甲醇选择氧化催化剂,同时揭示双金属颗粒中Au和Pd的协同效... 甲醇选择氧化制备甲酸甲酯(MF)是延伸甲醇产业链、开发高附加值下游产品的有效途径之一,负载型Au及Pd催化剂在这一反应中表现出优异的低温催化性能。为探索实用、高效和易再生的甲醇选择氧化催化剂,同时揭示双金属颗粒中Au和Pd的协同效应及甲醇氧化反应机理,本研究制备了一系列二氧化硅负载的Au-Pd催化剂(Au-Pd/SiO2),详细研究了其对甲醇选择氧化制甲酸甲酯的催化性能。结果表明,Au和Pd总负载量为0.6%、且Au/Pd质量比为2时,所制备的Au2-Pd1/SiO2催化剂表现出优异的甲醇氧化催化性能;在130℃下,甲醇转化率达到57.0%,MF选择性为72.7%。多种表征结果显示,Au-Pd双金属纳米颗粒粒径为2-4nm,高度分散于SiO2载体表面,倾向于生成孪晶结构并暴露(111)晶面,这些因素是Au-Pd/SiO2具有优异催化性能的主要原因。通过DRIFTS表征研究,提出了一个可能的MF生成机理:即甲醇首先与处于Au-Pd纳米粒子界面的表面氧作用,生成化学吸附的甲氧基;随后,甲氧基经去质子作用生成吸附的甲醛物种,后者与相邻的甲氧基物种亲核反应,并经β-H消除后得到目标产物MF。 展开更多
关键词 甲醇选择性氧化 甲酸甲酯 二氧化硅 双金属纳米粒子
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Concealed porphyry delineation based on nonlinear three-dimensional densitydifference inversion: An example in the Beiya mine area, Western Yunnan, China 预览
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作者 Jian Yang Sheng-xian Liang +3 位作者 Qiao Wang Wei Zhang Jing Guo Guo-zhong Liao 《中国地质(英文)》 2019年第3期342-353,共12页
Intermediate acid-complex rock masses with low-density characteristics are the most important prospecting sign in the Beiya area, of western Yunnan province, and provide a physical basis for good gravity exploration. ... Intermediate acid-complex rock masses with low-density characteristics are the most important prospecting sign in the Beiya area, of western Yunnan province, and provide a physical basis for good gravity exploration. It is usually difficult to obtaining solutions in connection with actual geological situations due to the ambiguity of the conventional gravity-processing results and lack of deep constraints. Thus, the three-dimensional (3D) inversion technology is considered as the main channel for reducing the number of solutions and improving the vertical resolution at the current stage. The current study starts from a model test and performs nonlinear 3D density-difference inversion called “model likelihood exploration”, which performs 3D inversion imaging and inversion of the known model while considering the topographic effects. The inversion results are highly consistent with those of the known models. Simultaneously, we consider the Beiya gold mine in Yunnan as an example. The nonlinear 3D densitydifference inversion technology, which is restricted by geological information, is explored to obtain the 3D density body structure below 5 km in the mine area, and the 3D structure of the deep and concealed rock masses are obtained using the density constraints of the intermediate-acid-complex rock masses. The results are well consistent with the surface geological masses and drilling-controlled deep geological masses. The model test and examples both show that the 3D density-difference nonlinear inversion technology can reduce inversion ambiguity, improve resolution, optimize the inversion results, and realize “transparency” in deeply concealed rock masses in ore-concentrated areas,which is useful in guiding the deep ore prospecting. 展开更多
关键词 THREE-DIMENSIONAL density INVERSION Concealed PORPHYRY Gold deposit MINERAL resources exploration engineering Beiya mine area YUNNAN Province China
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Study on Rapid Detection of Tetracyclines,Fluoroquinolones and Sulfonamides in Milk 预览
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作者 Yuping WAN Xiaosheng WU +5 位作者 Tingting CUI Dongshan CAO Zhaoqin WANG Linchen WANG Chunyan YANG Fangyang HE 《农业生物技术:英文版》 CAS 2019年第1期241-245,共5页
Aiming at the market demand for rapid detection of tetracyclines,fluoroquinolones and sulfonamides in milk,a golloidal gold immunochromatography test strip for simultaneous detection of tetracyclines,fluoroquinolones ... Aiming at the market demand for rapid detection of tetracyclines,fluoroquinolones and sulfonamides in milk,a golloidal gold immunochromatography test strip for simultaneous detection of tetracyclines,fluoroquinolones and sulfonamides in milk was prepared based on the principle of competitive inhibition immunochromatography.The performance indicators of the test strip were verified.The results showed that the test strip can simultaneously detect 4 tetracyclines,13 fluoroquinolones and 13 sulfonamides,and the detection limits all can meet the national residue limits;the tests strip exhibited false positive rate≤5%and false negative rate=0;and no cross-reaction with other drugs was commonly found in milk,indicating good specificity.The method is simple,rapid,and has low cost and easy popularization.It provides a means for realizing on-site rapid detection and is of important practical significance to guarantee of safety of milk and dairy products in China. 展开更多
关键词 MILK TETRACYCLINES FLUOROQUINOLONES SULFONAMIDES COLLOIDAL gold IMMUNOCHROMATOGRAPHY assay
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矿石中金铂钯联测新方法研究 预览
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作者 虞洁 《当代化工研究》 2019年第10期60-61,共2页
金元素在自然界含量极低,地壳丰度为1ng/g,在自然界主要以自然金产出,部分与铂族元素形成合金存在于自然界中,铂钯为铂族元素,在地壳中含量极微,属于超痕量元素.目前铂族元素的分析,由于其含量极低,基体复杂,背景干扰严重,是当代岩石矿... 金元素在自然界含量极低,地壳丰度为1ng/g,在自然界主要以自然金产出,部分与铂族元素形成合金存在于自然界中,铂钯为铂族元素,在地壳中含量极微,属于超痕量元素.目前铂族元素的分析,由于其含量极低,基体复杂,背景干扰严重,是当代岩石矿物分析公认的难题,目前国内尚且没有一个合适的方法可以同时测定出矿石中的金,铂,钯三种元素的含量.本方法采用金属锑富集矿石中的金,铂,钯三种元素,再利用浓王水解析,解析后的溶液定容至10毫升比色管中,用原子吸收分光光度计测定溶液中的金元素,用电感耦合等离子体质谱测定溶液中的铂钯元素,本方法分析结果准确,分析速度快,并且同时测定出矿石中的金,铂,钯三种元素,极大地提高了分析速度,便于大批次样品的普查和详查. 展开更多
关键词 矿石 原子吸收分光光度计 电感耦合等离子体质谱
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LyP-1 peptide-functionalized gold nanoprisms for SERRS imaging and tumor growth suppressing by PTT induced-hyperthermia
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作者 Xi Huang Yanlong Yin +2 位作者 Min Wu Wang Zan Qian Yang 《中国化学快报:英文版》 SCIE CAS CSCD 2019年第6期1335-1340,共6页
Gold-based nanomaterials with plasmonic properties exhibit various potentials for biomedical applications. In this work, gold nanoprisms (GNPs) was synthesized and then modified with LyP-1, a tumor-homing peptide, to ... Gold-based nanomaterials with plasmonic properties exhibit various potentials for biomedical applications. In this work, gold nanoprisms (GNPs) was synthesized and then modified with LyP-1, a tumor-homing peptide, to improve the affinity of the GNPs to tumor cells, thus, to improve the efficacy of tumor-targeted photothermal therapy. The introduction of NIR dye IR780 not only enabled the GNPs-based nanosystem with the surface-enhanced resonant Raman scattering (SERRS) property, but also enhanced the plasmonic photothermal property which delivering therapeutic heating by 660 nm laser irradiation. The obtained GNPs/IR780-LyP-1 presented significantly increased of photothermal conversion in vitro and in vivo, which resulted in enhanced tumor-targeting photothermal therapeutic efficacy after laser irradiation. Hence, the GNPs/IR780-LyP-1 prepared in this study can be served as a Raman-encoded molecular imaging candidate and photothermal therapy agents for future cancer treatment. 展开更多
关键词 GOLD NANOPRISMS SERRS IMAGING LyP-1 PEPTIDE Tumor targeting Photothermal therapy
Genetic algorithm aided density functional theory simulations unravel the kinetic nature of Au(100) in catalytic CO oxidation
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作者 Yi Fang Xueqing Gong 《中国化学快报:英文版》 SCIE CAS CSCD 2019年第6期1346-1350,共5页
Heterogeneous catalysis is of tremendous importance to modern industries. Exposed atoms of heterogeneous catalysts are heavily involved in surface processes such as the adsorption, activation, diffusion and reaction o... Heterogeneous catalysis is of tremendous importance to modern industries. Exposed atoms of heterogeneous catalysts are heavily involved in surface processes such as the adsorption, activation, diffusion and reaction of substrate molecules. Surfaces of metal or metal oxide based catalysts are usually taken as hard templates that only undergo limited relaxation during catalytic reactions, especially in theoretical simulations. In this work, by using genetic algorithm (GA) aided density functional theory (DFT) calculations, we studied the surface processes involved in CO oxidation on the Au(100) surface. The use of GA greatly improves the capacity of DFT calculations in locating the potential energy surface (PES) of the surface reactions, and surprisingly, it has been found that the Au(100) surface can undergo drastic reconstruction under the influence of O adsorption and the adapted partially oxidized Au surface exhibits unique activities for subsequent adsorptions and reactions. This work depicts the kinetic nature of the Au (100) surface in its catalyzed reactions and also significantly expands our understanding of how surface atoms act in heterogeneous catalysis. 展开更多
关键词 Gold CATALYSTS GENETIC algorithm Density functional theory Potential energy SURFACE SURFACE reconstruction
甘肃阳山金矿岩(矿)石中金的化学相态分析
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作者 陆继龙 范玉超 +2 位作者 熊玉新 尹业长 赵玉岩 《吉林大学学报:地球科学版》 CAS CSCD 北大核心 2019年第4期992-1000,共9页
本文采用石墨炉原子吸收光度计测定了甘肃阳山金矿岩(矿)石中金的5种化学相态(可溶相、游离自然金、碳酸盐相、硫化物相和硅酸盐相)的质量分数,并分析了其在不同类型的岩(矿)石和不同时代地层中的分布特征。结果表明:区域岩石中的金主... 本文采用石墨炉原子吸收光度计测定了甘肃阳山金矿岩(矿)石中金的5种化学相态(可溶相、游离自然金、碳酸盐相、硫化物相和硅酸盐相)的质量分数,并分析了其在不同类型的岩(矿)石和不同时代地层中的分布特征。结果表明:区域岩石中的金主要以硅酸盐相存在,占总量的57.6%;矿石中的金主要以硫化物相存在,占总量的56.9%;与岩石中金的相态分布对比,矿石中硫化物相金、游离自然金和碳酸盐相金所占比例明显偏高;可溶相、游离自然金、碳酸盐相和硫化物相是阳山金矿成矿有利相态;赋矿地层金的成矿有利相态所占比例明显高于其他地层,即使金的合计与其他地层相近甚至较低。可根据成矿有利相态所占比例判断地层成矿潜力,这为岩石地球化学的异常评价提供了新的依据。 展开更多
关键词 类卡林型金矿 化学相态分析 硫化物相 阳山金矿
Mass-production of flexible and transparent Te-Au nylon SERS substrate with excellent mechanical stability
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作者 Wei-Ran Huang Cheng-Xin Yu +4 位作者 Yi-Ruo Lu Hassan Muhammad Jin-Long Wang Jian-Wei Liu Shu-Hong Yu 《纳米研究:英文版》 SCIE EI CAS CSCD 2019年第6期1483-1488,共6页
In the past two decades,the field of surface-enhanced Raman scattering (SERS) has flourished and many rational strategies have been reported for the successful construction of SERS substrates.However,it still lacks th... In the past two decades,the field of surface-enhanced Raman scattering (SERS) has flourished and many rational strategies have been reported for the successful construction of SERS substrates.However,it still lacks the mass-production and programmability for practical applications with arbitrary configurations,and it is highly desirable to develop SERS substrates with strong signal enhancement,large-scale surface area,easy fabrication and low cost.Herein,we demonstrate a large-area fabrication (1.5 m × 5 m) of low-cost (18.8 dollars per square meter),highly sensitive,flexible and transparent SERS substrate by a simple solution process.The high sensitivity of SERS substrate using 3,3'-diethylthiatricarbocyanine iodide (DTTCI) as probe molecules is strongly dependent on the density and diameter of gold nanoparticles (NPs) on the surface of nylon mesh with the best enhancement factor (EF) of 9.17 × 10^10 and the SERS detection limit of DTTCI molecules is as low as 10-14 M which shows no obvious degradation even after 10,000 cycles of fatigue test,high temperature (above than 160 ℃) and acid-alkali treatment,indicating their excellent stability for the performance in all climates. 展开更多
关键词 MASS-PRODUCTION FLEXIBLE TRANSPARENT surface-enhanced Raman scattering gold nanoparticles
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