气相色谱法测定环境中微量甲醇色谱柱的选择

甲醇是一种重要的化工原料,也是大气、水环境中一项重要的环境指标.本文主要针对气相色谱法分离柱及分离条件的选择进行论述,采用GDX-102(60-80)/2m色谱柱,在进样温度150 ℃、柱温100 ℃,载气N2流速为45 ml/min,H2/Air比为1/10的条件下,有效分离了甲醇、水及其它可能存在的干扰组分,如甲醛、乙醇、丙酮等.具有简便、快捷、灵敏度高、选择性好的优点.同时,对该色谱柱也作为甲醛的常量分析方法进行了探讨.     

Pilot Scale Evaluation of Ozone and Other Drinking Water Disinfectants Using Mutagenicity Testing

Mutagenicity produced by the oxidants chlorine, chloramines, chlorine dioxide and ozone when used in drinking water treatment was examined in a pilot scale study conducted at Edmonton, Canada. Both the Ames test, and a yeast assay using Saccharomyces cerevisiae (strain D7144–2) were employed. In the Ames test, chlorination produced utagenicity the most frequently; samples obtained following ozonation rarely were mutagenic. In the yeast assay, utagenicity was seen only infrequently. Granular activated carbon effectively removed mutagenicity for a long period of time.     

工艺参数对T91/102TLP接头显微组织与性能的影响

在氩气保护下,用FeNiCrSiB非晶合金中间层对T91和102异种耐热钢管进行了瞬时液相扩散连接.通过接头力学性能、显微硬度、组织以及元素扩散的检测,分析了三种工艺参数对接头显微组织和力学性能的影响并得出了最佳工艺.结果表明,瞬时液相扩散连接可实现T91与102的成功连接,并且当连接温度在1 230 ℃,等温凝固时间为4 min,压力为4 MPa时,接头两侧晶粒跨界面生长,组织均匀,焊缝变形小,强度高于母材.     

航天器DC-DC模块电源电磁兼容设计

针对航天器用DC-DC模块电源电磁兼容设计中的发射干扰(RE102和CE102),探寻其产生发射干扰的根源,并分析了DC-DC模块电源输入输出端EMI的产生原因,阐述了工程中常用的抑制EMI的方法:滤波器设计法、印制板EMC设计法.对干扰测试结果超标的DC-DC模块电源采取相应的抑制措施后,测试结果有了显著的改善.     

经长时运行的T91与G102异种钢焊接接头寿命分析

对运行78000 h的T91与12Cr2MoWVTiB(G102)异种钢焊接接头进行了寿命分析.估算其剩余寿命为24500h.鉴于强度校核所需最小壁厚已远超过管子实测壁厚,建议尽快更换此类异种钢焊接接头.     

文11联原油脱水与注入水处理技术

针对文１１联合站原油脱水与注入水处理简易流程,在室内筛选出反相破乳剂ＲＤ－１以聚代原用破乳剂ＤＲ９５１,又筛选了阻垢剂ＨＥＤＰ、净水剂聚合氯化铁＋聚合氯化铝、杀菌剂ＨＣＢ－２,在文１１联矿场简易程试验中使用这一组化学剂,使破乳剂加量由２８．６ｍｇ／Ｌ降到８．７ｍｇ／Ｌ,脱水电流由１５Ａ降到５Ａ,电脱水温度由７０℃降至６０℃,脱出污水含油由１３７１ｍｇ／Ｌ降至４５－５０ｍｇ／Ｌ,消除了系统结垢,净化     

修饰的COF-102吸附和分离CO2/CH4的计算机模拟（英文）

Covalent organic framework (COF) is a porous material with low density and large BET (Brun-auer-Emmett-Teller) surface area. They have great potential in gas adsorption and separation. In this work, the ad-sorption of pure CO2 and CO2/CH4 mixture on modified COF-102 was simulated by using GCMC (grand canonical Monte Carlo). Metal Li was incorporated into COF-102 through three doping methods, including charge exchange, O--Li+ dipolar interaction and O--Li+ chemical bonding. The influence of Li doping on the adsorption of CO2 was studied. The results showed that among the three methods, the dipole doping is the best way to improve CO2 ad-sorption performance. Further, the ligands of COF-102 were replaced by extended aromatic moieties, such as di-phenyl and pyrene. The adsorption capacity of CO2 and CH4, and the selectivity of CO2/CH4 on the ligand-replaced COF-102 were studied. The capacity of CO2 and CH4 on the ligand-replaced COF-102 had obvious changes; hence the selectivity of CO2/CH4 can be adjusted accordingly.     

Numerical Solution to Space-Angle Energy-Dependent Neutron Integral Transport Equation

A numerical approach to the steady-state, space-, angle- and energy-dependent neutron transport equation is presented for neutron shielding calculations. The scattering integral, with anisotropic treatment of elastic scattering and isotropic treatment of inelastic scattering, is evaluated by the use of Gaussian and straightforward quadratures. A system of coupled one-group integral equations for all the energy meshes of interest, converted from the energy-dependent integral transport equation, is calculated by performing a line integration along the neutron path in the direction of motion. For this purpose the direction of neutron motion is represented by discrete-ordinate directions Ω_pq on the unit sphere.

The final presentation of the integral transport equation is derived in a difference form convenient for machine computation. A computation program PALLAS has been written in Fortran IV for IBM 360-75 computer to perform neutron transport calculations based on this approach.

Comparisons are given of the numerical solutions with analytical solutions for unscattered fluxes in various geometries such as plane, spherical and two-dimensional cylindrical, for volume sources with self absorption, and with experimental spectra for angular neutron fluxes in graphite-, polyethylene- and water-shield. Excellent agreement is obtained between the present calculations and analytical or experimental results.     

牛102井欠平衡泡沫水平井钻井技术

介绍了吐哈三塘湖油田牛102井利用泡沫流体以欠平衡钻井方式钻水平井段的钻井设计及施工情况.将欠平衡钻井、水平井钻井技术两种工艺相结合并且成功应用在牛102井.着重论述了水平井段欠平衡钻井负压差值的选择依据,以及泡沫流体各参数的设计方法.该项技术在牛102井的成功实践为今后同类条件油田的勘探开发提供了宝贵的经验和借鉴.     

甘肃小厂坝铅锌矿石选矿试验

甘肃小厂坝铅锌矿石属原生硫化铅锌矿石,主要含铅矿物方铅矿大部分与闪锌矿嵌布关系密切,单体解离难度大、微细粒回收效果不理想是导致铅回收率较低的主要原因。以D102为浮铅捕收剂,采用1粗2扫3精优先浮铅、1粗2扫3精再浮锌流程处理该矿石,最终可获得铅品位为59.72%、回收率73.52%、含锌14.56%的铅精矿,锌品位为52.97%、回收率92.12%、含铅1.60%的锌精矿,在锌回收率略有提高的情况下将铅回收率提高了2.04个百分点。