Alkaline pressure oxidative leaching of bismuth-rich and arsenic-rich lead anode slime

A new alkaline pressure oxidative leaching process(with NaNO3 as the oxidant and NaOH as the alkaline reagent)is proposed herein to remove arsenic,antimony,and lead from bismuth-rich and arsenic-rich lead anode slime for bismuth,gold,and silver enrichment.The effects of the temperature,liquid-to-solid ratio,leaching time,and reagent concentration on the leaching ratios of arsenic,antimony,and lead were investigated to identify the optimum leaching conditions.The experimental results under optimized conditions indicate that the average leaching ratios of arsenic,antimony and lead are 95.36%,79.98%,63.08%,respectively.X-ray diffraction analysis indicated that the leaching residue is composed of Bi,Bi2O3,Pb2Sb2O7,and trace amounts of NaSb(OH)6.Arsenic,antimony,and lead are thus separated from lead anode slime as Na3AsO4·10H2O and Pb2Sb2O7.Scanning electron microscopy and energy-dispersive spectrometry imaging revealed that the samples undergo appreciable changes in their surface morphology during leaching and that the majority of arsenic,lead,and antimony is removed.X-ray photoelectron spectroscopy was used to demonstrate the variation in the valence states of the arsenic,lead,and antimony.The Pb(IV)and Sb(V)content was found to increase substantially with the addition of NaNO3.     

Tunable fabrication of single-crystalline CsPbI3 nanobelts and their application as photodetectors

Lead halide perovskites have received increasing attention recently as a candidate material in various optoelectronic areas because of their high performance as light absorbers. Herein, we report the growth of CsPbI3 nanobelts via a solution process. A single-crystalline CsPbI3 nanobelt with uniform morphology can be achieved by controlling the amount of PbI2. A single-crystalline CsPbI3 nanobelt possesses a mean width, length, and thickness of 100 nm, 5 μm, and 20 nm, respectively. In this work, photodetectors (PDs) based on individual CsPbI3 nano-belts are constructed and found to perform well with an external quantum efficiency and responsivity of 2.39 × 105％ and 770 A/W, respect-ively. The PDs also show a high detectivity of up to 3.12 × 1012 Jones, which is at par with that of Si PDs. The PDs developed in this work ex-hibit great promise in various optoelectronic nanodevices.     

面向对象技术在管理信息系统（MIS）中的应用研究

本文分析了现行管理信息系统缺点，给出了一个通用管理信息系统实例，研究了面向对象技术在管理信息系统中的应用。     

缝管捕集原子吸收光谱法测定水样中的微量铅

分别采用普通火焰原子吸收光谱法、石英缝管原子吸收光谱法及缝管捕集原子吸收光谱法，对铅元素的最佳实验条件和灵敏度进行了测定、比较，并应用石英缝管原子捕集法测定了水样中的微量铅，结果令人满意。     

水基热分解法制备钛酸铅系薄膜

采用水基热分解法在ＳｉＯ２／Ｓｉ基底上制备了钛酸铅和掺镧钛酸铅铁电薄膜。详细研究了以水为溶剂，将铅盐和钛醇盐等直接加入到溶剂中制成先体溶液，测量溶液的ＤＴＡ－ＴＧＡ曲线和透光率曲线；对薄膜作ＸＲＤ和ＳＥＭ分析，并对其结果进行了简要讨论了测量了室温下薄膜介电性能和铁电性能。     

越南东山铜鼓再认识与铜鼓分类新说

用国际视野对越南东山铜鼓和东山文化重新考察 ,可以看出 ,东山铜鼓以其强烈的地域特色和重要的历史地位 ,作为铜鼓文化发展中的重要角色参与铜鼓分类是无可置疑的。     

浅谈铅的污染及对人的危害

铅广泛应用于人们的生产、生活领域，但铅又是一种极具污染性的物质。它通过在环境和人体中的循环，对人体的神经系统、血液系统及其它方面产生毒害作用。铅对人体的危害主要有环境类、职业类、生活类、药物类、母源类五种方式。     

L—2（10）—蒎烯四醋酸铅氧化产生扩环产物的结构

在四醋酸铅氧化L-2(10)-蒎烯的产物中,首次分离得到三种扩环产物2、3、4,经HR-MS、EI-MS、NMR(~1H、~(13)C、H-H COSY、H-C COSY)、IR等波谱方法确定,分别为(1S,6S)-7,7-二甲基双环[4.1.1]-3-辛烷酮及其异构体(1R,6S)-7,7-二甲基双环[4.1.1]-2-辛烷酮和(4S)-4-异丙烯基环庚烷酮,文中还讨论了反应机理。     

老年人的脑血流图

本文报道200例60岁以上老年人脑血流图的测定结果,并与184例青年人的脑血流图进行比较分析。老年人脑血流图的特点,主要表现为:波型发生一定变化(转折波增多,乳头、圆顶、平顶等波的比例也有所增多),重搏波减低或消失,波幅下降,两侧波幅的不对称有所增加,上升时间延长,上升角变小,顶夹角变钝,流入容积速度减慢,转折高此值和血管弹力指数变小,紧张度指数和血管阻力指数增大等。     

论管理过程中的柔性化领导

随着科学管理的不断发展,传统的发号施令的领导方式越来越不适应当今社会各种组织发展的需要,柔性化的领导逐渐兴起并占据重要地位。这种以人为本的领导方式,要求领导者自身要有较强的亲和力和协调能力、较高的耐心和责任感、善于进行共情式领导。在管理中领导者要有效地实施柔性化管理,就必须以人为本,建立有效的激励机制;重视调控组织成员的情绪情感;加强人际沟通与协调,团结合作;提高非权力因素的影响力。