预应力箱梁智能张拉施工控制

结合工程实例,简要介绍了预应力箱梁智能张拉技术的工作原理,从施工准备工作、千斤顶安装、张拉施工三方面阐述了其施工技术要点,并提高了预应力张拉的质量及安全控制措施,提高预应力混凝土箱梁的张拉质量。     

氯化锂湿度计用于高炉鼓风湿度自动调节系统

高炉鼓风不论采用那种方法,都应检测鼓风湿度并保持其稳定,因为大气湿度在冬夏和昼夜之间约在2～20克/标米~3间变动,这种变化会明显地干扰高炉的“热量管理”。湿度每变化10克/标米~3约需要32大卡的热量,这意味着炉膛中熔化温度变动100℃～180℃。显然,这种温度变化必然妨碍高炉熔炼过程的均衡,因而出现加湿或脱湿调剂。目前世界上技术先进的高炉一般都有湿度自动调节系统。而我国一些厂现仍使用苏制ДВ-264型干湿球湿度传送器,这种温度传送器有一系列缺点:精确度低于±5％,滞后性很大,润湿纱布会很快落上灰尘而使仪表指示值发生偏差,由于这种偏差常常觉察不出,而使调节给定值不真实。润湿纱布最     

用198Au示踪法研究季铵盐体系萃取金

The solvent extraction of KAu(CN)2 from alkaline solution by quaternary ammonium salts (trialkylmethylammonium chloride or cetyltrimethylammonium bromide) waw investigated by means of ^198Au radioactive tracer method. Various parameters,such as the gold (I) concentration in aqueous phase,the modiffer,emulsifiation at the interface of two phases, and phase ratio used in the extraction of gold (I) were studied. The results demonstrate that almost all gold (I) in the aqueous phase was practically extracted into the organic phase. The water content in the organic phase decreased significantly with increase of gold (I) concentration using long chain alcohol as modifier,in contrast with the system with tributyl phosphate (TBP) as modifier. Emulsification at the interface of two phases decreases with an increase of modifier concentration in the organic phase or with the addition of a small amount of lysozyme into the aqueous phase. The method with ^198Au tracer can be directly used to determine the Au(I) concentration both in aqueous and organic phases, which is especially suitable for the low concentration of Au(I).     

西南沟1号隧道塌方成因及处治

以西南沟1号隧道塌方事件为背景,全面分析该隧道塌方形成的原因,研究提出针对性的处理方案,并取得了预期效果,为今后同类隧道塌方处理积累了宝贵经验。     

季铵盐体系金的萃取与反萃

在碱性条件下研究了十六烷基三甲基溴化铵(CTAB)微乳液体系萃取KAu(CN)2. 实验考察了水相金浓度、反萃液中卤素离子、NH4SCN及羟乙基硫醚浓度对金萃取和反萃的影响及有机相中水含量与金萃取的关系. 结果表明：CTAB/己醇/庚烷微乳液体系可将绝大部分金从水相萃取到有机相;随着萃入金的增加,有机相水含量减少. 卤素离子的反萃能力顺序为：KI>KBr>KCl;高KI浓度(>2.0 mol/L)可将有机相中绝大部分(94%)的金反萃出来. 羟乙基硫醚及NH4SCN也是金的良好反萃剂,两者混合可以降低反萃液粘度,又可以减小NH4SCN浓度,而保持较高的金反萃率.     

双水相体系从碱性氰化液中萃取分离金研究

报道利用聚乙二醇（ＰＥＧ）／硫酸钠（Ｎａ２ＳＯ４）双水相体系从碱性氰化液中萃取分离金。实验考察初始水相 ｐＨ值,ＰＥＧ及 Ｎａ２ＳＯ４浓度等对 ＫＡｕ（Ｃ）２萃取影响。结果表明：富硫酸钠相（下相）的 ＫＡｕ（ＣＮ）。几乎全部转移到富 ＰＥＧ相（上相）,且与ｐＨ值无关。随ＰＥＧ或Ｎａ２ＳＯ４浓度减小,金的分配系数减小。双水相萃取可能为金分离提供了一种新方法。     

物联网中基于区块链的密态内容审计方案

低功耗广域网技术以功耗低、距离远等优势,已成为当前的一个研究热点。但是,由于低功耗广域网中传感器节点安全防护能力有限、容易老化以及存在恶意节点等问题,导致系统在效率和私密性方面并不是完全可靠。针对上述问题,本文为无线电广域网的媒体介入控制层设计一套密文数据审计算法。通过使用布隆过滤器,加快密文数据处理的效率。此外使用同态加密技术,在保护数据的前提下,实现有效密文数据范围查询功能。最后利用区块链技术实现对通讯数据的溯源,方便日后对问题节点进行追踪。分析结果显示,新方案具有较高的安全性能,并且运行效率能够达到O(logn)。     

构建和谐矿区工会应发挥更重要作用

工会要围绕推动我公司（局）经济和矿区全面发展为工作出发点，为建设和构建和谐矿区发挥重要作用。     

添加剂存在下超临界CO2萃取乙醇的研究

本文报导,加入添加剂后,采用超临界ＣＯ２萃取乙醇,能越过乙醇－水系统的常压恒沸组成,获得无水乙醇,并可显著提高乙醇的萃取得率     

亲和反胶团选择性萃取分离酵母乙醇脱氢酶

The reversed micelles were formed with cationic cetyltrimethylammonium bromide (CTAB) as surfactant and n-hexanol as cosolvent in the CTAB (50mmol L-1)/hexanol (15% by volume)/hexane system. Cibacron Blue 3GA (CB) as an affinity ligand in the aqueous phase was directly introduced to the reversed micelles with electrostatic interaction between anionic CB and cationic surfactant. High molecular weight (Mr) protein, yeast alcohol dehydrogenase (YADH, Mr = 141000) from baker's yeast, has been purified using the affinity reversed micelles by the phase transfer method. Various parameters, such as CB concentration, pH and ionic strength, on YADH forward and backward transfer were studied. YADH can be transferred into and out from the reversed micelles under mild conditions (only by regulation of solution pH and salt concentration) with the successful recovery of most YADH activity. Both forward and backward extractions occurred when the aqueous phase pH>pI with electrostatic attraction between YADH and CTAB. Th