天铁5#高炉强化冶炼实践

天铁集团对5^#高炉进行了大修改造，高炉大修改造后，具备了优化操作的条件，高炉利用系数已由大修前平均2．5t/m^3．d达到3．20t／m^3．d的水平，煤比达到了150kg／t．Fe以上，实现了强化冶炼。     

山东石横特钢450m^3高炉利用系数达到3．92t／m^3．d

2005年10月份，山东石横特钢集团有限公司450m^3高炉利用系数达到3．92t／m^3．d，比全国平均水平高出0．64t／m^3．d，位居全国第3名。     

泰钢450m3高炉设计特点

泰钢450m^3高炉设计采用了炉缸陶瓷杯，无料钟炉顶，外滤式布袋除尘，高炉监控系统等先进实用的技术。高炉投产后，利用系数达到3．17t／(m^3．d)，超过设计指标。     

太钢4350m^3高炉强化冶炼初探

通过加强进厂原燃料管理、强化炉前出铁管理、实施大富氧率喷吹技术和优化高炉基本操作制度，太钢4350m^3高炉的燃料比降到500kg／t以下，利用系数达到了2．4t／m^3·以上，实现了高炉稳定、均衡和高效生产。     

泰钢2号450m^3高炉连续5个月利用系数超过4．0

2005年12月落千丈投产的泰钢2号450m^3高炉连续5个月利用系数超过4．0，利用系数最好的一天达到4．45，利用系数最差的一天也达到3．87，5个月这座高炉共生产生铁26．78万t，不管是利用系数还是其它指标都达到了全国同类型高炉的先进水平。在高炉生产中，他们的基本做法一是坚持大批料、正分装、全风温，稳定炉况，活跃炉缸，提高煤气利用的高炉操作基本方针；二是强化冶炼，提高炉顶压力；三是加强设备的维护保养，提高设备运转率；四是严格培训，提高职工的操作水平。     

莱钢喷煤技术进步

分析了莱钢高炉喷煤特点，通过采取改善原燃料条件，加强高炉操作，提高风温等措施，莱钢750m^3高炉煤比达到了180kg／t，高炉利用系数达2．7。     

4^#高炉设备长寿管理浅谈

介绍炼铁厂4^#高炉设备管理特点；阐述4^#高炉通过其成功完善的设备管理综合措施的实施，达到高炉长寿目的的同时，利用系数达到3．4t/m^3．d以上，休风率0．65％以下。     

莱钢3#750m3高炉开炉操作及快速达产分析

莱钢3^#750m^3高炉由于开炉准备工作充分，选择合适的开炉料和送风参数，送风后尽快降硅，高炉开炉5天时间即达产，其间无悬料、坐料，当月利用系数达到2．14t／m^3．d。     

太钢4350m^3高炉提高利用系数的生产实践

太钢4350m^3高炉通过提升原燃料质量管理,采取高富氧率操作,控制合理的煤气流分布和加强炉前作业等生产管理,2008年12月后连续6个月实现高炉有效容积利用系数2．40t/（m^3·d）,炉缸截面积利用系数达66．0t／（m^3·d）以上。     

高炉利用系数的确定

根据近年来我国高炉技术经济指标的统计数据，对各级高炉利用系数的确定进行了广泛的研究。认为1000m^3级高炉的设计年平均利用系数为2．00～2．40；2000m^3级高炉的设计年平均利用系数为2．00～2．35；3000m^3级高炉设计年平均利用系数上限为2．30。各级高炉都应在降低燃料比的基础上来提高利用系数，这样才符合科学发展观的要求。     

Regional mapping panels for chromosomes 3, 4, 5, 11, 15, 17, 18, and X

The erm family of 23S rRNA adenine-N6-methyltransferases confers resistance to all macrolide-lincosamide-streptograminB (MLS) antibiotics, but not all MLS antibiotics induce synthesis of Erm methyltransferase with equal efficiency in a given organism. The induction efficiency of a test panel of MLS antibiotics was studied by using two translational attenuator-lac reporter gene fusion constructs, one based on ermSV from Streptomyces viridochromogenes NRRL 2860 and the other based on ermC from Staphylococcus aureus RN2442. Four types of responses which were correlated with the macrolide ring size were seen, as follows: group 1, both ermSV and ermC were induced by the 14-membered-ring macrolides erythromycin, lankamycin, and matromycin, as well as by the lincosamide celesticetin; group 2, neither ermSV nor ermC was induced by the 12-membered-ring macrolide methymycin or by the lincosamide lincomycin or the streptogramin type B antibiotic ostreogrycin B; group 3, ermSV was selectively induced over ermC by the 16-membered-ring macrolides carbomycin, chalcomycin, cirramycin, kitasamycin, maridomycin, and tylosin; and group 4, ermC was selectively induced over ermSV by the 14-membered-ring macrolide megalomicin. These data suggest that the leader peptide determines the specificity of induction by different classes of MLS antibiotics and that for a given attenuator, a major factor which determines whether a given macrolide induces resistance is its size.     

Increased-contrast, high-spatial-resolution, diffusion-weighted, spin-echo, echo-planar imaging

An insertable head gradient coil with a maximum gradient amplitude of 45 mT/m and a rise time of 150 musec along all three major axes was used to collect high-spatial-resolution, single-shot, spin-echo, echo-planar, diffusion-weighted magnetic resonance images with b values ranging from 0 to 2,200 sec/mm2. Improvements in spatial resolution allowed better visualization of large white matter tracts and their relation to adjacent anatomic structures. Excellent contrast and anatomic detail were revealed for most structures in the brain when a sufficient number of acquisitions were collected.     

ICP-AES法测定铍铜合金中Be, Ni, Ti, Co, Fe, Al, Si, Mg和Pb

通过操作条件的试验研究，用基体匹配法校正基体干扰，并选择了最佳工作条件。样品加标回收率为96％～110％，方法快速、简便、可靠，适用于铍铜合金的快速检验。     

Susceptibilities of non-Pseudomonas aeruginosa gram-negative nonfermentative rods to ciprofloxacin, ofloxacin, levofloxacin, D-ofloxacin, sparfloxacin, ceftazidime, piperacillin, piperacillin-tazobactam, trimethoprim-sulfamethoxazole, and imipenem

Agar dilution MICs of 10 agents against 410 non-Pseudomonas aeruginosa gram-negative nonfermentative rods were determined. MICs at which 50 and 90% of the isolates were inhibited, respectively, were as follows (in micrograms per milliliter): sparfloxacin, 0.5 and 8.0; levofloxacin, 1.0 and 8.0; ciprofloxacin, 2.0 and 32.0; ofloxacin, 2.0 and 32.0; D-ofloxacin, 32.0 and > 64.0; ceftazidime, 8.0 and 64.0; piperacillin with or without tazobactam, 16.0 and > 64.0; trimethoprim-sulfamethoxazole, 0.5 and > 64.0; imipenem, 2.0 and > 64.0. With the exception of those for Stenotrophomonas maltophilia, Burkholderia cepacia, and Alcaligenes faecalis-A. odorans, agar dilution MICs for all strains tested were within 1 dilution of inhibitory (bacteriostatic) levels as determined by time-kill methodology.     

原子荧光光谱法测定土壤中的铅、铬、镉、汞、砷、锌、铜、镍等元素研究

土壤无机污染物铅、铬、镉、汞、砷、锌、铜、镍这八大重金属,是一般土壤检测中的必检项目。金属元素在土壤中积累富集后,有可能通过雨水迁移,造成地下水,地表水污染,或者通过农作物进入食物链,进而影响食品安全和人体健康,因此,对这些元素的检测显得尤为重要。本文采用原子荧光光谱法对土壤中的金属元素进行测量,同时结合微波消解技术对样品进行处理,确保测量数据的准确性。     

铂饰品中Pt, Pd, Au, Ag, Cu, Ni, Zn, Fe的测定

试验研究建立了同一试料溶液连续、同时测定铂饰品中各成分的分析方法。主体Pt以氯铂酸铵称量法及火焰原子吸收光谱(FAAS)法或电感耦合等离子发射光谱(ICP-AES)法测定滤液中残留Pt进行补差而测定。主成分Pd,Au,Ag,Cu和焊料成分Ni,Zn,Fe以FAAS法或ICP-AES法测定。其方法回收率分别为:Pt99.9%~100%;Pd99.3%~99.7%;Au99.5%~l01.5%;Ag98.0%~100%;Cu97.7%~99.3%;Zn98.0%~99.0%;Ni94.0%~105%;Fe95.0%~99.0%。实际试样分析时,各成分质量分数之和一般在99.12%~l01.2%之间,接近于100%,间接说明方法的可靠性。本法适用于Pt-Pd二元体系和Pt-Pd-Au-Cu多元复杂体系的铂饰品的破坏分析,可用于校正X荧光光谱法无损检测铂饰品的分析结果。     

稀土金属中14种非稀土杂质的ICP-MS法同时测定

本文研究了用 ICP- MS仪器同时测定稀土金属中 Mg、Al、Ti、Cr、Mo、Mn、Co、Ni、Cu、Zn、Pb、W、Nb、Ta等 14种非稀土杂质。研究了各稀土基体对被分析元素的基体效应 ,选择了相匹配的内标元素。比较了标准曲线法与标准加入法的测定结果。确定了用内标元素校正基体效应及仪器漂移 ,以标准曲线法直接测定。进行了加料回收和精密度实验 ,回收率在 94%～ 113%之间 ,RSD<10 %。被分析元素的检出限为 0 .0 1～ 0 .2 0 ng/ m L,测定下限为1～ 2 0 μg/ g。