Adsorption of Cu^2 ＋, Zn^2＋ and Cd^2＋ on Bacillus subtilis

A process of biosorption of Cu2 , Zn2 and Cd2 on Bacillus subtilis was investigated. The experiments show that the process of biosorption is quite fast. The maximum adsorption was reached after 5 min and hardly changed with time. The experimental data was analyzed using four sorption kinetic models: the pseudo-first-order, the Ritchie second-order, the modified second-order and the Elovich equations, which helped to determine the best-fit equation for the sorption of metal ions onto biomass. The results show that both the Ritchie second-order and modified second-order equations can fit the experimental data. The Langmuir model is able to accurately describe adsorption of Cu2 and Zn2 on B. subtilis. The experimental data points of adsorption Cd2 and Zn2 on B. subtilis are described by Freundlich isotherms model.     

碳中和背景下我国典型战略性金属中长期可持续供给路径

矿产资源是经济社会发展的重要物质基础,不合理开采、利用、消费不仅会影响产业链和供应链的安全,而且会对生态环境造成严重污染。新一轮科技革命和碳中和战略正在重塑全球创新版图和技术格局,伴随着我国经济社会发展进入后疫情阶段,战略性金属的供需结构正发生深刻变化。一方面,其产业链和供应链面临的安全挑战从传统的资源产品获取能否得到保障,蔓延至开采、加工、应用、循环利用等全产业链条。另一方面,我国固体废物产生量迅速增长,但其作为二次金属的循环利用率仍然不高,这将导致大量资源损失。面向未来,国家（政府）应尽快建立二次金属的资源量和储量精细分类分级管理体系,健全二次金属的收集和资源化体系,促进制订资源高效利用制度及标准,保障国内战略性金属的高效内循环及自给自足,彻底摆脱战略性金属受制于人的局面。     

全球主要铂族金属需求预测及供需形势分析

铂族金属是现代工业中不可或缺的矿产,广泛应用于首饰、汽车尾气催化剂、电子元件、化工催化剂等领域,美国、欧盟、英国等发达国家都将其作为战略性矿产。本文对2016-2030年铂族金属中消费量最大的铂、钯的全球需求量进行了分区域预测,同时预测了未来10年铂族金属二次资源的全球回收量,并对未来全球铂族金属的原矿供应及供需形势进行了判断。在未来全球铂族金属需求量增长,回收量提高,供需整体平衡的背景下,指出了中国铂族金属稀缺,产量难以增长,对外依存度居高不下,进口量将在一定范围内继续增长,未来满足需求将依赖二次资源回收。针对这些问题,放眼未来,提出了与主要供应国达成长久稳定的供应协议和加强铂族金属二次资源的回收利用等对策建议。     

高纯度偏三甲苯生产工艺的应用

以兰州石油化工公司的10万吨/年重芳烃分离装置为例,论述了原料、技术方案、工艺流程、关键设备和加热热源等装置的主要工艺技术,介绍了装置特点和开工试生产情况,以及开工过程出现的问题和对策.     

凤眼莲对铜、铅和镉离子的耐受性及短期富集机制研究

凤眼莲对Cu2 、Pb2 、Cd2 等离子的耐受性为:Cd＞Pb＞Cu.短期累积去除率为Pb＞Cu＞Cd;表明凤眼莲在快速高效去除低浓度含铅废水、治理含镉废水和作为铜污染废水的指示性植物等方面有良好的应用前景.     

重金属废水的治理和回收综述

综述重金属废水的治理方法及回收技术的一般原理，介绍化学法、物理化学法，尤其是生物化学法的研究现状及应用前景，最后指出生物化学法处理重金属废水是一种长期、高效、经济、可靠的方法。     

福建临港工业发展存在的问题与对策

以福建港口开发区的历史和现实为立足点,根据产业集聚发展规律和特点,以及福建临港工业发展的现状,分析目前其存在的问题,并提出针对性的对策措施。福建应以临海工业区开发建设为突破口,充分发挥港口连接产业的效应,重点发展以建筑材料、电力、轻纺、船舶修造和食品加工为主导的临港工业群,形成以港口工业带动经济发展的新格局。     

Nonparametric inferences for kurtosis and conditional kurtosis

Under the assumption of strictly stationary process, this paper proposes a nonparametric model to test the kurtosis and conditional kurtosis for risk time series. We apply this method to the daily returns of S&P500 index and the Shanghai Composite Index, and simulate GARCH data for verifying the efficiency of the presented model. Our results indicate that the risk series distribution is heavily tailed, but the historical information can make its future distribution light-tailed. However the far future distribution's tails are little affected by the historical data.     

论重量弹奏在钢琴演奏中的重要性

钢琴音乐形象的塑造 ,是通过丰富多变的音色和适当的节奏来完成的。合理运用重量弹奏 ,是钢琴表现音色的关键。各种风格的音乐作品 ,都应通过运用自如的重量弹奏给予准确的艺术表现。     

The Effect of Bilingualism on the Measured Intelligence of Elementary School Children of Italian Parentage

The recency of the community college movement has prevented large scale organization and dissemination of knowledge concerning the processes and steps required to establish a community college. There is, therefore, a need for means to incorporate contemporary evidence into the curriculum of prospective administrators of higher education. The purpose of this study was to compare Higher Education Administration students’ peceptions of a logical sequence of events for establishing a community college with a sequence of events for establishing a community college as determined by practice. The Edwards’ matched-pair technique was used to rank the perceptions of the students. A sequence of twenty-nine events was selected from the literature. Each event was matched with every other, thus providing 406 decision situations. From these decisions an ordering was obtained. Using the Spearman rho correlation technique, a coefficient of 0.82 was found between the sequence of events taken from the literature and rank ordering of these events as determined by the Edwards’ matched-pair technique.