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Editorial:Industrial relevance of molybdenum in China 认领
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作者 Tim Outteridge Nicole Kinsman +1 位作者 Gaetano Ronchi Hardy Mohrbacher 《先进制造进展:英文版》 SCIE CAS CSCD 2020年第1期35-39,共5页
About 80%of all molybdenum mined in the world(not including units recovered via recycling)is used as an alloying element in iron and steel.In general,the intensity of molybdenum use in China is still lower than in mor... About 80%of all molybdenum mined in the world(not including units recovered via recycling)is used as an alloying element in iron and steel.In general,the intensity of molybdenum use in China is still lower than in more highly developed regions such as the USA and Europe.This difference is manifest in both carbon steels and stainless steels,suggesting a significant opportunity for more widespread use of molybdenum in the future as China follows its self-reliance policy,calling for more sophisticated materials.Active market development,as being pursued by the International Molybdenum Association(IMOA),is a key asset in that respect.This article summarizes some key facts on molybdenum mining,use and market development in China. 展开更多
关键词 China molybdenum industry Global molybdenum reserves Molybdenum applications Enduser markets Molybdenum alloying Market development
稀有金属钼资源回收现状及进展 认领
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作者 张汉鑫 李慧 +1 位作者 梁精龙 张立生 《矿产综合利用》 CAS 北大核心 2020年第1期47-49,共3页
金属钼作为一种稀有金属,在含钼的废弃物中回收钼,不仅可以降低钼矿的开采率,也可以将废弃物进行有效利用。介绍了对含钼废弃物进行回收的必要性,以废催化剂、选钼尾矿和含钼废水为主要回收原料,列举了多种不同回收金属钼的方法,如:Na2... 金属钼作为一种稀有金属,在含钼的废弃物中回收钼,不仅可以降低钼矿的开采率,也可以将废弃物进行有效利用。介绍了对含钼废弃物进行回收的必要性,以废催化剂、选钼尾矿和含钼废水为主要回收原料,列举了多种不同回收金属钼的方法,如:Na2CO3焙烧-水浸取法、焙烧-有机物萃取法、溶剂萃取法、离子交换法等。并且比较了这些方法的优缺点,其中Na2CO3焙烧-水浸取法和离子交换法的钼回收率更高且对环境友好。综述了回收金属钼的研究现状,对我国钼产业及钼回收工艺流程的研究发展进行展望。 展开更多
关键词 废催化剂 选钼尾矿 含钼废水 研究现状 展望
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Preparation of a New Solid-State Molybdenum-Selective Electrode and Application 认领
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作者 krü Kalayci 《美国分析化学(英文)》 2020年第5期221-231,共11页
A new solid state molybdenum-selective electrode has been developed. The electrode is composed of 20% MoS2, 60% Ag2S, and 20% Cu2S. An analytically useful potential change occurred, from 1 × 10-5 to 1 × 10-1... A new solid state molybdenum-selective electrode has been developed. The electrode is composed of 20% MoS2, 60% Ag2S, and 20% Cu2S. An analytically useful potential change occurred, from 1 × 10-5 to 1 × 10-1 M molybdenum ion. The slope of the linear portion (1 × 10-1 - 1 × 10-5 M) was about 45 ± 2 mV/10-fold concentration changes in molybdenum. It was found that pH change between 1 and 12 had no effect on the potential of the electrode. There was no interference of most common cations such as K+, Na+, Ca2+, Mg2+, Cu2+ and Fe3+ anions such as Cl-, ,? and . The lifetime of the electrode was more than 2 years, when used at least 4 - 5 times a day, and the response time was about 30 s. This electrode has been used for the determination of molybdenum ion in wine using standard addition method. The validation of the electrode has been made with a commercial molybdenum DP polarography and high consistency was obtained. 展开更多
关键词 MOLYBDENUM ELECTRODE Determination Solid State ELECTRODE DP POLAROGRAPHY SPINACH
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Effects of the Catalytic System MoO<sub>2</sub>(acac)<sub>2</sub>-TBHP in Polyisoprene Epoxidation Using Experimental Design 认领
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作者 José R. Gregório Elisa Barbosa-Coutinho +2 位作者 Annelise E. Gerbase Márcia Pires Fortes Ferreira Marly A. M. Jacobi 《材料科学与化学工程(英文)》 2020年第3期39-51,共13页
The epoxidation of polydienes yields materials with improved properties, which can be tuned by the control of the epoxidation degree. In this work, we retake a known process, the epoxidation of polyisoprene, by a diff... The epoxidation of polydienes yields materials with improved properties, which can be tuned by the control of the epoxidation degree. In this work, we retake a known process, the epoxidation of polyisoprene, by a different approach, in which the quantification of parameters influencing the epoxidation, such as temperature, oxidant and catalyst concentration, and reaction time degree is evaluated. We measured the influence of each parameter, allowing anyone who aims a polymer with a certain degree of epoxidation to choose which conditions are best suitable for reaching his goal. 展开更多
关键词 EPOXIDATION MOLYBDENUM POLYISOPRENE Experimental Design
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Separation of Molybdenum Isotopes at Supercritical Fluid Extraction with Carbon Dioxide in a Vertical Gradient Field of Temperatures 认领
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作者 Boris Viktorovich Borts Stella Fedorovna Skoromnaya Viktor Ivanovich Tkachenко 《金属学报(美国)》 2020年第1期1-15,共15页
Separation of molybdenum isotope complexes by supercritical fluid extraction (SFE) with carbon dioxide was studied experimentally. The extraction of molybdenum isotope complexes was carried out in the updated extracti... Separation of molybdenum isotope complexes by supercritical fluid extraction (SFE) with carbon dioxide was studied experimentally. The extraction of molybdenum isotope complexes was carried out in the updated extraction chamber (reactor) of the SFE-U installation, which provided an initial pressure of P ≤ 20 MPa at constant temperatures of the upper T1 = 35&deg;C and bottom T2 = 45&deg;C flanges. The device, through which the eluent was discharged, involved a set of four thin tubes of different lengths located inside the reactor. The axes of the tubes and the reactor are parallel and the tubes are equally spaced circumferentially inside the reactor. The extract was removed from each tube through channels isolated from each other and located in the bottom flange with cylindrical expansion, in which several layers of filter paper were placed. After passing through the filters the extract entered a restrictor designed to remove the eluent from the reactor. The initial pressure of carbon dioxide and the holding time of the extract were specified in the experiments. The level of the eluent sampling was set by the lengths of the tubes depending on the reactor height. A method of producing molybdenum complexes was described. It was experimentally shown that at an initial pressure of 20 MPa and a given holding time a difference from the natural content of Mo isotopes for given heights of extract sampling depending on the reactor height was observed in extracts removed through filters. The ranges of deviation of the content of molybdenum isotopes in extracts from natural one were determined. 展开更多
关键词 Carbon Dioxide SUPERCRITICAL Fluids Extraction MOLYBDENUM ISOTOPES SEPARATION
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硫酸亚铁铵氧化还原滴定法测定钼精矿中钼 认领
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作者 郭兵 《世界有色金属》 2020年第10期155-156,共2页
本文主要研究了钼精矿中常量钼的分析方法,并应用于我公司实际生产实践,建立的方法适合公司目前生产现状。此方法主要的内容是:钼精矿先用硝酸—氯酸钾饱和溶液低温加热溶解,再用硫酸、浓磷酸、高氯酸混酸高温加热消解,然后在酸性介质中... 本文主要研究了钼精矿中常量钼的分析方法,并应用于我公司实际生产实践,建立的方法适合公司目前生产现状。此方法主要的内容是:钼精矿先用硝酸—氯酸钾饱和溶液低温加热溶解,再用硫酸、浓磷酸、高氯酸混酸高温加热消解,然后在酸性介质中,以盐酸氯丙嗪作为指示剂,抗坏血酸还原掩蔽高价铬、锰、铈等金属离子,用硫酸亚铁铵直接滴定钼(VI)。从磷酸用量、硫酸用量、抗坏血酸用量、指示剂用量以及滴定温度等方面进行了实验条件的优化,取得了理想的效果。测定钼含量范围为10%以上的钼精矿,误差均在0.4%以内。 展开更多
关键词 钼精矿 硝酸-氯酸钾 硫酸亚铁铵
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Hydrochemical Evaluation of Molybdenum Content of the Groundwater Aquifer System in Northern Jordan 认领
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作者 Tasneem H Hiasat Omar A. Rimawi Issa M. Makhlouf 《水资源与保护(英文)》 2020年第3期223-239,共17页
The groundwater quality of Wadi Al Arab aquifer, northwest Jordan, was assessed for its high molybdenum concentrations, which reach 1.62 mg/L. This value of Mo-concentration was far beyond the Jordan Institution for S... The groundwater quality of Wadi Al Arab aquifer, northwest Jordan, was assessed for its high molybdenum concentrations, which reach 1.62 mg/L. This value of Mo-concentration was far beyond the Jordan Institution for Standards and Metrology (JISM) and World Health Organization (WHO) guidelines. Hydro-geochemical studies were carried out in order to assess the chemistry of the groundwater quality focusing on identifying the hydrogeochemical processes and mechanisms that are involved in the high Mo concentration. The water quality data of Wadi Al Arab boreholes (1986-2018) was collected, and the dataset analyzed. Interpretation of hydrochemical data showed that the anions are dominated by? ?with abundance order of?, while the main cation is Ca2+, with abundance order of Ca2+ > Mg2+ > Na+ > K+;water type is . The reason is the passage of groundwater through carbonate rocks. The distribution of the sampling points in the Gibbs diagram showed that the majority of samples are plotted within the field of rock weathering, which indicates that the main factor controlling dissolved hydrochemical components of the water samples is the dissolution of the rock-forming minerals. The scattered plot of the Mo with other critical heavy metals shows two different trend lines suggesting initiation of molybdenum to groundwater which is probably derived from oil shale and phosphate. The effects of pH and redox potential on Mo mobility in water are reviewed using the paurbaix diagram. The Mo species of the sampled wells are confined to the field of : anoxic/non-sulfidic condition (Fe reduction) which is located in the unconfined part of the aquifer, and which is sulfidic condition (low and high) in the confined aquifer. 展开更多
关键词 MOLYBDENUM Hydrogeochmistry GROUNDWATER WADI Al-Arab
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钼在合金钢冶炼中的应用现状和发展前景 认领
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作者 张朝晖 李东林 +3 位作者 邢相栋 刘世锋 张光曦 鲁慧慧 《钢铁研究学报》 CAS CSCD 北大核心 2020年第1期1-8,共8页
综述了目前国内外钼在合金钢冶炼中的应用现状,介绍了传统钼铁生产工艺,并明确了传统工艺能耗较高、污染严重的弊端。系统分析了采用工业氧化钼直接合金化生产含钼合金钢的方法和优势,针对该工艺存在的氧化钼易挥发等关键问题进行总结,... 综述了目前国内外钼在合金钢冶炼中的应用现状,介绍了传统钼铁生产工艺,并明确了传统工艺能耗较高、污染严重的弊端。系统分析了采用工业氧化钼直接合金化生产含钼合金钢的方法和优势,针对该工艺存在的氧化钼易挥发等关键问题进行总结,阐述了国内外该领域的研究进展和解决途径,即利用在氧化钼合金化过程中配加CaO等碱金属或碱土金属的方式能够有效抑制氧化钼挥发。最后,进一步分析了钼在不锈钢、低合金钢、工模具钢及其他合金钢中的应用现状和研究进展,提出了钼在合金钢冶炼中的未来发展方向。 展开更多
关键词 钼铁 工业氧化钼 合金钢
文章速递Design and modulation principles of molybdenum carbide-based materials for green hydrogen evolution 认领
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作者 Jing-Qi Chi Min Yang +3 位作者 Yong-Ming Chai Zhi Yang Lei Wang Bin Dong 《能源化学:英文版》 SCIE EI CAS CSCD 2020年第9期398-423,I0012,共27页
The green production of hydrogen from electrocatalytic water splitting is an important base and promising direction for the future of the large-scale application of hydrogen energy.The key of green hydrogen evolution ... The green production of hydrogen from electrocatalytic water splitting is an important base and promising direction for the future of the large-scale application of hydrogen energy.The key of green hydrogen evolution depends on the development of low-cost and highly active electrocatalysts.Molybdenum carbides(MoxC),as a typical of earth-abundant transition-metal material,have accumulated great attention due to their low cost,earth abundance,electrical conductivity,similar d-band state to Pt,and regulated morphology/electronic structures.In this paper,recent researches focusing on MoxC for efficient HER in a wide pH range are summarized from respects of modulation of unique morphology,electronic structure,and electrode interface step by step.Briefly,modulation of morphology influence the apparent activity of catalyst,modulation of electronic structure of active sites by heteroatom doping and designing heterointerface boost intrinsic HER kinetics,and modulation of electrode interface via hybridization of MoxC structures with carbon materials can ensure the fast electron transfer and boost the activity.Besides the above methods discussed,perspective and challenges of designing MoxC as the substitute of Pt-based electrocatalyst for practical hydrogen generation in a wide pH range are pointed out. 展开更多
关键词 Molybdenum carbides Classification Electrocatalyst Modulation strategy Hydrogen evolution
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文章速递Temperature-switching logic in MoS2 single transistors 认领
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作者 陈孝章 顾乐华 +4 位作者 刘岚 陈华威 栗敬俣 刘春森 周鹏 《中国物理B:英文版》 SCIE EI CAS CSCD 2020年第9期464-469,共6页
Due to their unique characteristics,two-dimensional(2D)materials have drawn great attention as promising candidates for the next generation of integrated circuits,which generate a calculation unit with a new working m... Due to their unique characteristics,two-dimensional(2D)materials have drawn great attention as promising candidates for the next generation of integrated circuits,which generate a calculation unit with a new working mechanism,called a logic transistor.To figure out the application prospects of logic transistors,exploring the temperature dependence of logic characteristics is important.In this work,we explore the temperature effect on the electrical characteristic of a logic transistor,finding that changes in temperature cause transformation in the calculation:logical output converts from‘AND’at 10 K to‘OR’at 250 K.The transformation phenomenon of temperature regulation in logical output is caused by energy band which decreases with increasing temperature.In the experiment,the indirect band gap of MoS2 shows an obvious decrease from 1.581 eV to 1.535 eV as the temperature increases from 10 K to 250 K.The change of threshold voltage with temperature is consistent with the energy band,which confirms the theoretical analysis.Therefore,as a promising material for future integrated circuits,the demonstrated characteristic of 2D transistors suggests possible application for future functional devices. 展开更多
关键词 molybdenum disulfide(MoS2) logic temperature dependence mobility
钼离子增强β-NaRMF 4纳米线的光致发光性能 认领
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作者 蔡冠宇 熊金平 《北京化工大学学报:自然科学版》 CAS CSCD 北大核心 2020年第3期67-75,共9页
采用共沉淀-溶剂热-离子交换(CSIE)法制备了0~20%(摩尔分数,下同)的钼离子(Mo 3+)掺杂的稀土氟化物上转换纳米线(UCNW)β-NaRMF 4。X射线衍射(XRD)分析表明,Mo 3+掺杂可以改变β-NaRMF 4纳米线的晶格结构,导致其(201)晶面衍射峰发生偏... 采用共沉淀-溶剂热-离子交换(CSIE)法制备了0~20%(摩尔分数,下同)的钼离子(Mo 3+)掺杂的稀土氟化物上转换纳米线(UCNW)β-NaRMF 4。X射线衍射(XRD)分析表明,Mo 3+掺杂可以改变β-NaRMF 4纳米线的晶格结构,导致其(201)晶面衍射峰发生偏移。透射电子显微镜(TEM)结果显示,通过控制Mo 3+掺杂量,改变纳米线在三维方向的生长速度,进而调控β-NaRMF 4纳米线的形貌,可使得其直径在20~50 nm范围内变化,长径比在20~500之间变化。荧光光谱显示,在980 nm近红外光激发下,10%Mo 3+掺杂导致β-NaRMF 4纳米线的上转换发光(UCL)增强了10倍。复合材料的上转换发光测试结果表明,β-NaRMF 4:Mo 3+纳米线增强体可赋予聚氨酯(PU)优异的光致发光性能,同时使聚氨酯的抗拉强度提高了99.30%,断裂伸长率提高了25.34%。 展开更多
关键词 稀土 氟化钆钠 离子交换 上转换 光致发光
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Phytic acid-derived fabrication of ultra-small MoP nanoparticles for efficient CO methanation: Effects of P/Mo ratios 认领
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作者 Jun Zhao Zijia Yin +3 位作者 Baowei Wang Zhenhua Li Yan Xu Xinbin Ma 《能源化学:英文版》 SCIE EI CAS CSCD 2020年第8期248-255,I0009,共9页
Molybdenum phosphide(MoP) catalyst has been widely applied in hydrogenation reactions, while the preparation of unsupported MoP catalysts with ultra-small size and large specific surface area(SBET) is still challengin... Molybdenum phosphide(MoP) catalyst has been widely applied in hydrogenation reactions, while the preparation of unsupported MoP catalysts with ultra-small size and large specific surface area(SBET) is still challenging. Herein, we have provided a facile method for preparing a series of MoP-x(x=P/Mo ratios ranging from 1 to 5) catalysts by pyrolyzing phytic acid(PA)-derived Mo complexes in a H2 atmosphere. The physicochemical properties and the catalytic activity of MoP catalysts were investigated. The results showed that the obtained MoP-5 catalyst had the largest SBETand exhibited ultra-small nanoparticle diameter of 3.6 nm, which ascribed to the chelation of PA and the confinement of deposited products.As the content of PA increased, the synthetic mechanism of MoP was also affected, which led to the difference in the valence of surface Mo species. The characterization results further confirmed that Moδ+ sites in MoP catalysts are active sites for methanation reaction and its content on the surface of MoP-x catalysts determines the catalytic activity. 展开更多
关键词 Molybdenum phosphide Phytic acid P/Mo ratios Ultra-small nanoparticle CO methanation
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Application of molybdenum target X-ray photography in imaging analysis of caudal intervertebral disc degeneration in rats 认领
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作者 Qi-Hang Su Yan Zhang +2 位作者 Bin Shen Yong-Chao Li Jun Tan 《世界临床病例杂志》 SCIE 2020年第16期3431-3439,共9页
BACKGROUND Conventional plain X-ray images of rats,the most common animals used as degeneration models,exhibit unclear vertebral structure and blurry intervertebral disc spaces due to their small size,slender vertebra... BACKGROUND Conventional plain X-ray images of rats,the most common animals used as degeneration models,exhibit unclear vertebral structure and blurry intervertebral disc spaces due to their small size,slender vertebral bodies.AIM To apply molybdenum target X-ray photography in the evaluation of caudal intervertebral disc(IVD)degeneration in rat models.METHODS Two types of rat caudal IVD degeneration models(needle-punctured model and endplate-destructed model)were established,and their effectiveness was verified using nuclear magnetic resonance imaging.Molybdenum target inspection and routine plain X-ray were then performed on these models.Additionally,four observers were assigned to measure the intervertebral height of degenerated segments on molybdenum target plain X-ray images and routine plain X-ray images,respectively.The degeneration was evaluated and statistical analysis was subsequently conducted.RESULTS Nine rats in the needle-punctured model and 10 rats in the endplate-destructed model were effective.Compared with routine plain X-ray images,molybdenum target plain X-ray images showed higher clarity,stronger contrast,as well as clearer and more accurate structural development.The McNemar test confirmed that the difference was statistically significant(P=0.031).In the two models,the reliability of the intervertebral height measured by the four observers on routine plain X-ray images was poor(ICC<0.4),while the data obtained from the molybdenum target plain X-ray images were more reliable.CONCLUSIONMolybdenum target inspection can obtain clearer images and display fine calcification in the imaging evaluation of caudal IVD degeneration in rats,thus ensuring a more accurate evaluation of degeneration. 展开更多
关键词 Molybdenum target inspection Routine plain X-ray Intervertebral disc degeneration model Animal experiment Imaging analysis McNemar test
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叶面喷施不同元素水溶肥料对花生产量的影响 认领
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作者 张庆豫 张宇 +3 位作者 黄宗营 沙文忠 贾明浩 黄晗达 《安徽化工》 CAS 2020年第2期23-24,35共3页
在夏花生下针期和结荚期喷施水溶肥料,考查不同元素对花生产量的影响.结果表明,花生喷施水溶肥料具有较好的增产效果,含钼元素水溶肥料增产效果优于不含钼元素水溶肥料,高钾对花生增产有利.与清水对照相比,含钼高钾型大量元素水溶肥料... 在夏花生下针期和结荚期喷施水溶肥料,考查不同元素对花生产量的影响.结果表明,花生喷施水溶肥料具有较好的增产效果,含钼元素水溶肥料增产效果优于不含钼元素水溶肥料,高钾对花生增产有利.与清水对照相比,含钼高钾型大量元素水溶肥料、含钼微量元素水溶肥料和不含钼中量元素水溶肥料增产率分别为68.41%、28.58%和18.59%,产投比分别为40.2:1,22.7:1和17.9:1. 展开更多
关键词 花生 水溶肥料 产量
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碱熔-强酸型阳离子交换树脂分离-电感耦合等离子体质谱法测定地质样品中硼锗钼锡碘钨 认领
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作者 金倩 李晓敬 +3 位作者 陈庆芝 孙孟华 王文娟 张雪梅 《冶金分析》 CAS 北大核心 2020年第7期52-59,共8页
B、Ge、Mo、Sn、I和W是区域地质调查样品54种元素必测项目,目前对这6种元素的测定广泛使用的方法基本是单独或两项结合进行样品的制备和测定,分析效率较低。实验建立了Na2O2熔融样品,强酸型阳离子树脂交换分离高含量钠盐,电感耦合等离... B、Ge、Mo、Sn、I和W是区域地质调查样品54种元素必测项目,目前对这6种元素的测定广泛使用的方法基本是单独或两项结合进行样品的制备和测定,分析效率较低。实验建立了Na2O2熔融样品,强酸型阳离子树脂交换分离高含量钠盐,电感耦合等离子体质谱法(ICP-MS)同时测定地质样品中B、Ge、Mo、Sn、I和W的方法。通过试验确定了对于0.5000g地质样品,以3.0g Na2O2为熔剂于750℃熔融8min,样品可熔解完全;对于引入的钠盐,通过对待测溶液使用强酸型阳离子交换树脂动态交换振荡30min可消除Na+对待测元素的影响;且测试时在每2个待测液之间以0.5%(V/V)氨水作清洗液可降低B、I的记忆效应。采用校正方程在线校正了74Ge的同量异位素干扰;选用碰撞模式测定Mo和W,消除多原子离子干扰;B、Ge、Sn和I选用普通模式测定。结果表明,在优化的条件下,B、Ge、Mo、Sn、I和W的检出限在0.092~0.57μg/g之间。按照实验方法对土壤成分分析标准物质GBW07451和水系沉积物成分分析标准物质GBW07362中B、Ge、Mo、Sn、I和W进行测定,相对误差和相对标准偏差均满足DZ/T 0258—2014《多目标区域地球化学调查规范》的要求。优化后的方法用于实际地质样品的分析,测定值与经典方法的结果一致,实现了B、Ge、Mo、Sn、I和W的同时测定,提高了测试效率。 展开更多
关键词 碱熔 过氧化钠 强酸型阳离子交换树脂 电感耦合等离子体质谱法(ICP-MS) 地质样品
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Atomic layer deposited 2D MoS2 atomic crystals:from material to circuit 认领
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作者 Hao Liu Lin Chen +4 位作者 Hao Zhu Qing-Qing Sun Shi-Jin Ding Peng Zhou David Wei Zhang 《纳米研究:英文版》 SCIE EI CAS CSCD 2020年第6期1644-1650,共7页
Atomic layer deposition(ALD)can be used for wafer-scale synthesis of 2D materials.In this paper,a novel,reliable,secure,low-cost,and high-efficiency process for the fabrication of MoS2 is introduced and investigated.T... Atomic layer deposition(ALD)can be used for wafer-scale synthesis of 2D materials.In this paper,a novel,reliable,secure,low-cost,and high-efficiency process for the fabrication of MoS2 is introduced and investigated.The resulting 2D materials show high carrier-mobility as well as excellent electrical uniformity.Using molybdenum pentachloride(MoCl5)and hexamethyldisilathiane(HMDST)as ALD precursors,thickness-controlled MoS2 films are uniformly deposited on a 50 mm sapphire and a 100 mm silica substrate.This is done with a high growth-rate(up to 0.90Å/cycle).Large-scale top-gated FET arrays are fabricated using the films,with a room-temperature mobility of 0.56 cm2/(V·s)and a high on/off current ratio of 106.Excellent electrical uniformity is observed in the whole sapphire wafer.Additionally,logical circuits,including inverters,NAND,AND,NOR,and OR gates,are realized successfully with a high-k HfO2 dielectric layer.Our inverters exhibit a fast response frequency of 50 Hz and a DC-voltage gain of 4 at VDD=4 V.These results indicate that the new method has the potential to synthesize high quality MoS2 films on a large-scale,with hypo-toxicity and enhanced efficiency,which can facilitate a broader range of applications in the future. 展开更多
关键词 atomic layer deposition molybdenum disulfide electrical uniformity field effect transistors logical circuits
在线稀释-预富集-ICP-MS法同时测定海水中钴和钼 认领
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作者 徐诗琴 符式锦 《广东化工》 CAS 2020年第10期156-157,155,共3页
建立了在线稀释-预富集-ICP-MS法同时测定海水中钴和钼的方法,并对方法的线性范围、检出限和定量限、精密度、准确度等进行了考察。结果显示:钴、钼的标准曲线线性良好,相关系数r均大于0.999;钴、钼的检出限分别为0.006μg/L、0.020μg... 建立了在线稀释-预富集-ICP-MS法同时测定海水中钴和钼的方法,并对方法的线性范围、检出限和定量限、精密度、准确度等进行了考察。结果显示:钴、钼的标准曲线线性良好,相关系数r均大于0.999;钴、钼的检出限分别为0.006μg/L、0.020μg/L,定量限分别为0.024μg/L、0.080μg/L;测定结果相对标准偏差(RSD)范围分别为6.5%~7.3%、4.1%~5.1%,精密度良好;加标回收率范围分别为86%~110%、84%~108%,标准物质相对误差范围分别为-7.4%~8.4%、-5.9%~4.9%,准确度良好。该法实现了海水样品的全自动前处理和多元素同时测定,操作简单、检测快捷、灵敏准确,方法可行。 展开更多
关键词 在线稀释-预富集 ICP-MS
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内蒙古自治区三号店594高地钼矿点地质条件及物化探特征 认领
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作者 王轩 王立佳 《世界有色金属》 2020年第6期279-280,共2页
通过对594高地的区域地质条件分析,包括地质背景、侵入岩岩性及接触关系、物探、化探、构造等方面;确定了矿体特征及找矿标志。钼矿体多发于在侵入体接触带部位,围岩蚀变主要有硅化、黄铁矿化等。硅化呈网脉状发育,黄铁矿化星点状分布... 通过对594高地的区域地质条件分析,包括地质背景、侵入岩岩性及接触关系、物探、化探、构造等方面;确定了矿体特征及找矿标志。钼矿体多发于在侵入体接触带部位,围岩蚀变主要有硅化、黄铁矿化等。硅化呈网脉状发育,黄铁矿化星点状分布于石英脉中或呈膜状、浸染状充填于硅化花岗岩裂隙面中;具高阻中高极化率特征,化探异常以Mo、Cu套合较好,浓集中心明显,异常呈条带状北西展布。 展开更多
关键词 594高地 侵入岩 物化探特征
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Interlayer-expanded MoS2 assemblies for enhanced electrochemical storage of potassium ions 认领
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作者 Sijia Di Pan Ding +4 位作者 Yeyun Wang Yunling Wu Jun Deng Lin Jia Yanguang Li 《纳米研究:英文版》 SCIE EI CAS CSCD 2020年第1期225-230,共6页
Potassium-ion batteries are regarded as the low-cost alternative to lithium-ion batteries.However,their development is hampered by the lack of suitable electrode materials.In this work,we demonstrate that MoS2 with ex... Potassium-ion batteries are regarded as the low-cost alternative to lithium-ion batteries.However,their development is hampered by the lack of suitable electrode materials.In this work,we demonstrate that MoS2 with expanded interlayers represents a promising candidate for the electrochemical storage of potassium ions.Hierarchical interlayer-expanded MoS2 assemblies supported on carbon nanotubes are prepared via a straightforward solution method.The increased interlayer spacing not only enables the better accommodation of foreign ions,but also lowers the diffusion energy barrier and improves diffusion kinetics of ions.When investigated as the anode material of potassium ion batteries,our interlayer-expanded MoS2 assemblies exhibit an excellent electrochemical performance with large capacity(up to∼520 mAhg^−1),good rate capability(∼310 mAhg^−1 at 1,000 mAg^−1)and impressive cycling stability,superior to most competitors. 展开更多
关键词 molybdenum disulfide interlayer expansion potassium ion batteries hierarchical structure
钼镉联合诱导对鸭抗氧化指标及脾脏凋亡基因mRNA表达的影响 认领
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作者 韦泽晶 陈花 +5 位作者 张彩英 胡国良 代雪艳 汪畅 皮少星 张萌萌 《中国兽医学报》 CAS CSCD 北大核心 2020年第5期993-999,共7页
为了研究钼镉联合诱导对鸭抗氧化指标和脾脏凋亡基因mRNA表达的影响,以(NH4)6Mo7O24·4H2O和3CdSO4·8H2O分别作为钼源和镉源,将120只11日龄体质量相近、体况健康的鸭随机分为对照组、低钼组、高钼组、镉组、低钼镉组和高钼镉组... 为了研究钼镉联合诱导对鸭抗氧化指标和脾脏凋亡基因mRNA表达的影响,以(NH4)6Mo7O24·4H2O和3CdSO4·8H2O分别作为钼源和镉源,将120只11日龄体质量相近、体况健康的鸭随机分为对照组、低钼组、高钼组、镉组、低钼镉组和高钼镉组,每组20只,对照组给予基础饲料,处理组在每千克基础饲料中分别添加钼15 mg、钼100 mg、镉4 mg、钼15 mg+镉4 mg、钼100 mg+镉4 mg,试验期为60 d。于试验30,60 d,各组取10只鸭,收集血液及脾脏组织,检测血清中抗氧化指标、脾脏组织CP基因和凋亡有关基因mRNA表达水平及观察其超微结构。结果显示:30 d,MDA含量联合组显著高于对照组(P<0.05),T-AOC高钼镉组显著低于其余各组(P<0.05),XOD活性联合组显著低于对照组(P<0.05);60 d,SOD活性、T-AOC处理组有下降趋势,且联合组显著低于对照组、单独组(P<0.05或P<0.01),XOD活性联合组显著低于对照组(P<0.05),而NOS、CAT活性和MDA含量有升高趋势,且联合组显著高于其他各组(P<0.05);60 d,除低钼组外,其余各组CP mRNA表达量显著低于对照组(P<0.05),而联合组Bak-1、Caspase-3 mRNA表达量极显著高于对照组、单独组(P<0.01);各组之间Bcl-2 mRNA表达量无显著差异(P>0.05);同时,电镜观察发现处理组脾脏组织细胞发生核变形、固缩,线粒体肿胀、嵴断裂、甚至空泡化等超微结构变化。结果表明,钼镉及其联合均可引起机体发生氧化应激,降低机体抗氧化能力,并激活线粒体介导的凋亡通路,从而导致脾脏组织的氧化损伤,并且钼和镉具有协同效应。 展开更多
关键词 氧化应激 凋亡 脾脏
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