四溴双酚S的合成

25g双酚S与38 4g溴素、32g双氧水在30℃反应3h,80℃反应1h,可得55 6g四溴双酚S,熔点289～290℃。使用H2O2氧化工艺过程中产生的Br-,使用氯苯代替甲醇作溶剂,避免了溴甲烷的生成,提高了溴素的利用率。     

中碳锰铁矿中锰和铁的连续测定研究

文章就中锰矿中锰和铁的测定进行了研究。在pH为5．4的六亚甲基四胺-盐酸缓冲介质中,以Cu＋EDTA—PAN-6S作混合指示剂,用EDTA络合滴定锰;在pH为5．0的HAc-NaAc缓冲介质中,以PAN-6S为指示刺,甩EDTA络合滴定铁;终点变色敏锐,准确度高,锰、铁比例在1：10～10：1范围之间相互无影响。此方法可用于中锰矿中锰和铁的连续测定,结果令人满意。     

Predicting external sulphur requirement of alfalfa from sulphate sorption isotherm of Tanzanian soils

For Tanzanian soils dominant in hydrous oxides of iron and amorphous ferri-alumino silicate, a 48-hour (hr) mixing period with the sulphate (SO₄) solution was adequate for a near-equilibrium condition. Although differing in their SO₄ sorption capacity, all the soils sorbed SO₄ at or beyond 1µg ml^–1 sulphur (S) concentration in the supernatant. Hydroxyl (OH) ions were displaced during SO₄ sorption as indicated by a significant positive correlation between the amount of sorbed SO₄ and the difference in pH values determined in 0.1N K₂ SO₄ and 0.1N KCl, i.e. the dpH values.In a greenhouse experiment, alfalfa was grown on eight soils at six adjusted S concentrations. Sulphur deficiency symptoms appeared in the control pots of those soils which were low in native sorbed SO₄, SO₄ sorption capacity and initial soil solution S concentration. Sulphur fertilization increased dry matter (DM) yield as well as response to applied S. The external S concentration, i.e. adjusted S concentration required for 95% of the maximum DM yield, ranged from 0.8 to 8.2µg S ml^–1 with values less than 2.0 on most of the soils. The external S concentration decreased hyperbolically as the SO₄ sorption capacity of the soils increased. The total amount of fertilizer S required to obtain the external S concentration in solution, and at the same time satisfy the SO₄ sorption capacity of the soil at the external S concentration (determined from the sorption isotherm) was defined as the external S requirement for the specified yield level of alfalfa. The external S requirement for 95% of the maximum yield of alfalfa varied from soil to soil due to differences in their capacity and intensity for S nutrition.Part of a thesis by the senior author for the MSc (Agric) degree of the University of Dar es Salaam     

天然气库上方土壤微生物群落研究

通过基于16S rRNA基因克隆文库的方法研究了天然气库上方土壤的微生物群落结构。针对大港油田板876气库上方同一取样点1.0 m和2.0 m的土壤样品构建了16S rDNA克隆文库DGS1和DGS2,并对其150个阳性克隆进行限制性酶切片段长度多样性分析(ARDRA)。结果表明,克隆文库DGS1有40个操作分类单元(OTU),克隆文库DGS2有39个OTU,该天然气库上方土壤中微生物较丰富;但由于土壤深度的不同两个土壤样品微生物群落结构存在着差异。每个OTU的代表克隆序列分析结果表明,克隆文库DGS1中优势菌群为芽单胞菌(Gemmatimonadetes)28%、绿弯菌(Chloroflexi)23%和放线菌(Actinobacterium)21%;克隆文库DGS2菌群分布较平均,其中Chloroflexi19%、硫氧化菌(Sulfur-oxidizing)12%、酸酐菌(Acidobacteria)10%、Gemmatimonadetes10%。天然气库上方土壤微生物多样性的分子分析可为开展微生物油气勘探(MPOG)技术奠定基础。     

超级奥氏体不锈钢S31254的焊接

S31254（1.4547/254SMO）是一种新型超级奥氏体不锈钢,因其具有优良的耐腐蚀性能,已逐渐取代普通的奥氏体不锈钢,广泛运用于工业生产中。本文详细分析了254SMO的焊接特点,并通过焊接工艺评定试验确定了合理的焊接工艺。     

S8000状态监测系统在空压机组上的应用

介绍了大型旋转机械在线状态监测系统S8000的特点、体系结构和软硬件环境,以及该系统在空压机组上的应用.     

The crucial role of cadmium acetate-induced conformational restriction in microscopic structure and stability of polystyrene-block-polyvinyl pyridine thin films

Block copolymers (BCPs) with inorganic components gained ground as a useful material with a broad range of applications. It is still a matter of discussion what influences of inorganic components on block copolymer structures. In this work we present the critical role of conformationally restricted effect by cadmium acetate (Cd(Ac)₂) on microscopic structure and film stability of polystyrene-block-poly(2-vinylpyridine) (S2VP) and polystyrene-block-poly(4-vinylpyridine) (S4VP). The influence of ion concentration, coordination type, as well as physical ageing on micelles and films were investigated and discussed. It was revealed that the coordination type played a critical role in both micelle and thin film morphology. As ion concentration increased, the intermolecular coordination between Cd(Ac)₂ and S4VP led to significant micelle coalescence and a decrease of film stability. However, intramolecular coordination between Cd(Ac)₂ and S2VP only affected the micelle size. The film prepared from a physically aged low Cd²⁺ concentration S4VP solution formed mesoporous structure. AFM and GISAXS results showed excellent lateral ordering within mesoporous films. These results suggest a facile procedure for the preparation of block copolymer mesoporous structures which can provide the base for highly functional materials such as highly efficient catalysts, photonic devices, and photovoltaic films.     

基于GNSS的农机自动导航控制系统设计

以New Holland T1554为平台,采用RTK-GNSS技术,设计了一种农机自动导航控制系统。系统包括基准站、接收机、无线电台、工控机、触摸屏、切换方向盘、电控比例液压阀和角度传感器。简述了系统各个模块的功能、安装位置和原农机油路的改造方法。样机的试验结果表明:直线和曲线行驶时,最大跟踪误差分别为0.16m和0.32m。     

硫化体系对CM/EPDM共混胶性能的影响

研究了不同硫化体系及过氧化物硫化体系中硫化剂用量对CM/EPDM共混胶性能的影响。结果表明,过氧化物(DCP/S)硫化体系的胶料具有适宜正硫化时间和较好综合物理机械性能;采用RCAD配方优化设计中的均匀设计法进行了实验设计,并根据优选结果绘制了等高线图;在实验范围内,DCP比CAMV的影响显著;当DCP用量为2.8～4份且CAMV用量为3～5份时,共混胶硫化胶具有较高拉伸强度和撕裂强度、较低压缩永久变形和较好耐磨性能。     

C4A3S̄ hydration,ettringite formation,and its expansion mechanism: III. Effect of CaO,NaOH and NaCl; conclusions

C₄A₃S? hydration, the mechanism of C₄A₃S? expansion, and ettringite formation have been examined in a 3-part study. In this part, the amount of ettringite formed and the degree of C₄A₃S? hydration were determined in systems deficient in Ca(OH)₂ and in NaOH- and NaCl-containing systems. Effects of hydration temperature (27, 45, and 60°C) were examined, and mechanisms were compared.     

影响塔后煤气含H_2S的主要因素及控制措施

对净化车间氨-硫化氢法(AS)煤气脱硫工艺中塔后煤气含H2S偏高的问题进行了分析,通过采用洗氨塔碱洗段二次洗涤煤气、提高洗涤贫液中NH3/H2S质量比、控制吸收操作温度、提高洗涤贫液流量等措施,使塔后煤气含H2S的指标达到了规定的要求。     

WSA硫回收工艺应用小结

低温甲醇洗装置分离出来的含H2S气体采用湿法制硫酸工艺(WSA硫回收工艺)生产质量分数98%的硫酸,硫回收率达99%以上,并副产中压蒸汽,经回收H2S后的清洁气达到国家排放标准。介绍了WSA硫回收工艺的原理、生产运行情况及改造措施。     

H2S在线分析仪的开发与研究

介绍基于比尔定律开发的H2S在线分析仪。该仪器主要应用于克劳斯硫磺回收系统，替代价格昂贵的进口仪表。     

普光气田酸压施工对硫化氢的安全防护

普光气田为高含硫干气天然气藏。由于H2S的危害,使开发难度加大,如何安全高效的开发含硫气田是个系统工程,本文着重讨论了气田开发的重要措施酸压施工过程的安全防护及应对措施,对可能发生的问题采取了相应的防护措施,保证酸压施工的安全。     

气体脱硫装置设备腐蚀原因分析及防护对策

对一催化气体脱硫装置设备腐蚀原因进行了分析,并从工艺过程、设备材质选型及监测等方面提出了相应的防护措施,以利于设备的安全监护和延缓设备使用周期,保障安全生产,减少损失。     

熟料液相对C3S矿物的影响

通过分析熟料液相对C3S矿物及熟料性能的影响，并根据有关数据建立了C3S与液相量的回归方程，提出增加生料中Fe^3 离子的加入，能够促进C3S的形成。     

改性半焦负载铁酸锌脱除高温煤气中的H2S

廉价半焦经硝酸活化及高温焙烧后,制得活性半焦负载铁酸锌脱硫剂,利用固定床反应器对其进行活性评价,并通过X射线衍射仪(XRD),BET等手段对znFe2O4/AC与ZnFe2O4脱硫剂的尖晶石结构、物性参数进行分析表征.结果表明,改性半焦的添加有助于活性组分的高度分散;在相同的活性组分含量下,添加改性半焦的铁酸锌的脱硫活...     

硫化氢废气处理新方法研究

酸性铁盐溶液氧化脱H2S是目前世界上比较先进的技术，其具有反应速度快、副反应少、硫磺回收率高和回收剂价格便宜等优点，是目前很有发展前途的H2S脱除方法。主要通过对该方法的原理及影响因素进行分析和研究，提出了最佳的工艺条件：酸性吸收液Fe^3＋浓度〉0．5mol／L，吸收温度60℃，吸收液高度1m，气嘴直径0．05mm，使废气H2S脱除率达99％以上，用于吸收镓生产尾气完全可以实现达标排放。工艺简单，消耗组分价格低廉，具有一定的应用价值。     

以黄铜矿为主的低品位硫化铜矿生物浸出体系中的细菌优势菌群

通过对以黄铜矿为主的低品位硫化铜矿中温硫杆菌生物浸矿体系的细菌优势菌群的研究,探讨了黄铜矿的细菌作用机理. 采用9K培养基从细菌浸出矿浆中分离出了14株中温硫杆菌,其浸矿能力都弱于分离前的自然混菌菌种,在浸矿过程中自然形成的混菌群落中各菌株之间存在着协同效应. 从上述菌株中随机挑选出氧化浸出能力有较大差异的YK8, YK12和YK14进行了16S rDNA克隆测序分析,显示它们与Acidithiobacillus ferrooxidans的同源性均达到99%,为嗜酸氧化亚铁硫杆菌. 由此说明该浸矿体系的优势菌群为嗜酸氧化亚铁硫杆菌,细菌氧化作用机理以直接作用为主. 各纯菌株对Fe2+的氧化率存在较大差异,对菌浸矿浆用不同能源诱导培养后的混菌浸矿能力有显著变化.