Precise analysis of H, C, N, and O as dominant impurities in Cu films: complementary use of SIMS and GDMS

Secondary ion mass spectrometry (SIMS) and glow discharge mass spectrometry (GDMS) were used to determine the impurity concentrations of hydrogen, carbon, nitrogen, and oxygen elements in Cu films, and the results of SIMS and GDMS were carefully interpreted. The Cu films were deposited on Si (100) substrates at substrate bias voltages ranging from 0 V to −150 V using a non-mass separated ion beam deposition method. From the results of SIMS using a Cs⁻ ion beam, as a whole, many high intensity peaks were observed in the Cu films deposited without substrate bias voltage. From the quantitative GDMS results, these peaks were determined to be signals detected as a cluster state such as C_xH_x, O_xH_x, C_xO_xH_x. Therefore, using a combination of these dominant impurities, all the unknown peaks observed in the SIMS results could be interpreted. Moreover, it was found that the dominant impurities having a great influence on the film purity were hydrogen, carbon, nitrogen, and oxygen.     

钒钛磁铁矿为氧载体的生物质气化转化特性

采用钒钛磁铁矿为氧载体对生物质的气化转化行为进行研究,系统考查转化温度、氧载体比例等关键因素的影响。借助热重-差热分析(TG-DSC)、傅里叶红外光谱(FTIR)、气相色谱-质谱联用(GC-MS)、X射线衍射(XRD)等分析测试手段对气化过程产物特性进行表征并揭示生物质转化机制。结果表明：温度升高有利于生物质的气化转化,所得气相产率和气相产物中CO及H₂占比皆显著增大;气相产物的释放主要集中在转化过程的前20min,CH₄、C₂H₄和CO₂等成分的析出率先达到峰值,CO和H₂的析出率达到峰值略有滞后;氧载体的加入可加快生物质各基团的裂解,促进固、液相产物向气相产物的转化。生物质的裂解转化历程可概括为—OH、—C=O、—C=C→—CH₃→—CH→—CO,此过程中钒钛磁铁矿逐渐被还原为金属化产品(金属化率可达80%以上)。     

HPLC-UV法测定大鼠体内S-腺苷蛋氨酸浓度及其药动学研究

目的: 建立HPLC-UV法测定大鼠血浆中S-腺苷蛋氨酸(S-Adenosylmethionine, SAMe)浓度,并用此法研究静脉给药后的大鼠体内药代动力学特征。方法: 色谱柱:大连依利特Kromasil C₁₈ 柱(4.6 mm×200 mm, 5 μm),流动相:甲醇∶0.3%三氟乙酸溶液(含1%磷酸二氢钠盐)=2∶98,等浓度洗脱,紫外检测波长:260 nm,流速:0.6 mL/min,柱温:30 ℃。大鼠(n=6)经静脉给予 140 mg/kg SAMe并测定血浆药物浓度,采用DAS 2.0 软件进行药动分析。结果: SAMe能完全分离,线性范围:10~2000 μg/mL,回归方程为Y=30241X+256204,r=0.9991, 日内精密度分别为 2.6%,3.6%,3.9%;日间精密度分别为 6.3%,4.9%,7.9%;回收率分别为107%,101%,98.3%。静脉给予 140 mg/kg SAMe药动学参数,血浆药物浓度-时间曲线下面积AUC_(0-t)为(569.52±174.87) mg·L^-1·h,半衰期(t_1/2)为(2.03±0.96) h,清除率(CL)为(0.21±0.13)L·h^-1·kg^-1,表观分布容积(V_d)为(0.53±0.31) L/kg。结论: 本实验方法专属性好,灵敏度高,可靠性强,可用于SAMe药动学分析。     

Vanadium recovery from clay vanadium mineral using an acid leaching method

A technique including direct acid leaching,vanadium precipitation with alkaline,sodium hydroxide releaching,impurity removing by adjusting pH value,precipitation vanadium with ammonium chloride,and vanadium pentoxide by roasting steps was proposed according to the characteristic of Xichuan clay vanadium mineral.The factors influencing leaching vanadium such as temperature and the concentration of sulfuric acid were investigated and optimized.The experimental results indicate that the extract ratios of V2O5 can reach 94% and 92% at a sodium chlorate ratio of 3% and a manganese dioxide ratio of 3%,respectively.A completely chemical precipitation method was adopted to decontaminate and enrich the vanadium in the acid leaching solution.The X-ray diffraction (XRD) pattern and the purity analysis of vanadium pentoxide indicate that the purity of final vanadium pentoxide can reach 99% and meet the standard specifications.The total recovery can reach about 75%.The technique has the characteristics of simplicity,less investlnent,and more environment safety as compared with the traditional salt roasting method.     

超细V_8C_7和Cr_3C_2粉末的制备方法

制备V8C7和Cr3C2粉末的传统方法是将V(Cr)氧化物与固体碳球磨混合﹑二次碳化而成,此方法存在碳化温度高﹑粉末粒度粗等缺点。本文介绍了几种国外制备超细V8C7和Cr3C2粉末的制备方法。     

氮化烧结V(C,N)颗粒增强铁基复合材料的研究

用热力学计算证明了氮化反应的可行性，用DTA确定了VN反应的温度范围。通过XRD和SEM比较了两种烧结气氛（真空和氮气）制备的颗粒增强复合材料烧结体的相组成、颗粒大小和形态分布。实验表明，由于V与N的亲合力大于V与C的亲合力，这导致了压坯的增强相由V6C5、V4C3向VN的转变；同时在1200℃（α-Fe→γ-Fe的相变为剩余的C的固溶创造了条件。     

乏燃料水池转运舱氦质谱检漏技术的应用

乏燃料水池转运舱是核电站乏燃料水池的组成部分,用于存放燃料组件倒料设备和水。监测乏燃料水池转运舱的水的泄漏率,通过气体和水的泄漏率转换,分析和计算出氦气检漏的泄漏率范围,并建立检测区域模型,优化检测范围和流程,通过范围查找和精确查找的结合,快速和准确地找到泄漏位置,以为乏燃料水池的查漏工作提供经验。     

氮化烧结V(C,N)颗粒增强铁基复合材料的研究

用热力学计算证明了氮化反应的可行性,用D TA确定了V N反应的温度范围。通过X RD和SEM比较了两种烧结气氛(真空和氮气)制备的颗粒增强复合材料烧结体的相组成、颗粒大小和形态分布。实验表明,由于V与N的亲合力大于V与C的亲合力,这导致了压坯的增强相由V 6C5、V 4C3向V N的转变;同时在1 200℃α-Fe!γ-Fe的相变为剩余的C的固溶创造了条件。     

热电池用锂钒氧化物正极材料的放电模式

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盐酸伊伐布雷定片人体药动学研究

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Enhanced oxygen exchange and incorporation at surface grain boundaries on an oxide ion conductor

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Comparative study of LNO, LSCO and LSMO as electrode layers for microelectronic capacitors by dynamic SIMS

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钒渣钙镁复合焙烧-浸出提钒（英文）

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含钒溶液萃取分离富集钒的研究进展

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LC-APCI-MS/MS法研究维氨酯在大鼠体内的排泄

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Role of second-phase particles in the oxidation of Al-Li alloys

Oxidation behavior of Al-Li alloys, containing a high volume fraction of Ferich second-phase particles, was studied at 530°C and 200°C. Morphological studies showed enhanced growth of Li-rich oxides in the vicinity of the insoluble second-phase particles. Microanalytical depth profiling of the oxide layer with a high resolution scanning ion microprobe indicated rapid diffusion and subsequent oxidation of Li at the free surface. Examination of the alloy surface after removal of the oxide layer suggested that the initial oxide growth occurred in the lateral direction. Secondary ion image depth profiling of the alloy surface after oxide removal revealed Li segregation to the alloy/second-phase interface, supplying Li for accelerated oxidation. A microstructural model of the oxidation process in this case is presented.