流动注射技术在土壤压出液系统分析中的应用研究

本文将流动注射分析用于土壤压出液中电导率、pH值、K^+、Na^+、Ca^(2+)、Mg^(2+)、HCO_3^-、Cl^-和SO_4^(2-)含量的连续测定。样品用量仅2—5ml,分析速度快,精密、准确,自动化程度较高。对合成样品分析的结果符合计算值,是少量样品多组份分析的有效方法。

前列腺炎患者前列腺液免疫球蛋白G、A和M测定

本文采用SRID对83例前列腺炎及27例正常对照组EPS中IgG、A、M含量进行了测定。结果表明前列腺炎患者EPS中IgG、IgA和IgM均明显高于对照组（P＜0.005），IgG/IgA显著低于对照组（P＜0.005）。并对25例前列腺炎患者治疗前、后进行了观察，治疗前EPS中三种Ig高于对照组（P＜0.01）和治疗后（P＜0.01），治疗后的三种Ig仍高于对照组（P＜O.01）。治疗前、后的IgG/IgA明显低于对照组（P＜0.01），而治疗前、后无显著区别（P＞0.05）。因此，应将EPS中三种Ig增高及IgG/IgA降低作为前列腺炎的诊断标准，并将EPS中三种Ig及IgG/IgA达到正常水平视为治愈的标准。

Effects of Gas Flow Field on Clogging Phenomenon in Close-Coupled Vortical Loop Slit Gas Atomization

In order to study the basic characteristics of gas flow field in the atomizing chamber near the nozzle outlet of the vortical loop slit atomizer and its influence mechanism on clogging phenomenon,the computational fluid dynamics(CFD)software Fluent is used to conduct a numerical simulation of the gas flow field in the atomizing chamber near the nozzle outlet of this atomizer under different annular slit widths,different atomization gas pressures and different protrusion lengths of the melt delivery tube. The results show that under atomization gas pressure p=4.5 MPa,the greater the annular slit width D,the lower the static temperature near the central hole outlet at the front end of the melt delivery tube,and the smaller the aspirating pressure at the front end of the melt delivery tube. These features can effectively prevent the occurrence of the clogging phenomenon of metallic melt. Under an annular slit width of D=1.2 mm,when the atomization gas pressure satisfies 1 MPa ≤ p ≤ 2 MPa and increases gradually,the aspirating pressure at the front end of the melt delivery tube will decline rapidly. This can prevent the clogging phenomenon of metallic melt. However,when the atomization gas pressure p >2 MPa,the greater the atomization gas pressure,the lower the static temperature near the central hole outlet at the front end of the melt delivery tube,and the greater the aspirating pressure at the front end of the melt delivery tube. Hence,the effect of preventing the solidification-induced clogging phenomenon of metallic melt is restricted. When atomization gas pressure is p =4.5 MPa and annular slit width is D=1.2 mm,the greater the protrusion length H of the melt delivery tube,and the smaller the aspirating pressure at its front end. The static temperature near the central hole that can be observed in its front end is approximate to effectively prevent the occurrence of clogging phenomenon of metallic melt. However,because of the small aspirating pressure,the metallic melt flows into the atomizing chamber from the central hole at the front end of the melt delivery tube at an increasing speed and the gas-melt ratio in the mass flow rate is reduced,which is not conducive to the improvement of atomization performance.

Ag recovery from copper anode slime by acid leaching at atmospheric pressure to synthesize silver nanoparticles

In this paper, recovery of silver from anode slime of Sarcheshmeh copper complex in lran and subsequent synthesis of silver nanoparticles from leaching solution is investigated. Sarcheshmeh anode slime is mainly consisted ofCu, Ag, Pb and Se. Amount of Ag in the considered anode slime was 5.4% （by weight）. The goal was to recover as much as possible Ag from anode slime at atmospheric pressure to synthesize Ag nanoparticles. Therefore, acid leaching was used for this purpose. The anode slime was leached with sulfuric and nitric acid from room to 90 ~C at different acid concentrations and the run which yielded the most recovery of Ag was selected for Ag nanoparticles synthesis. At this condition, Cu, Pb and Se are lea- ched as well as Ag. To separate Ag from leach solution HCI was added and silver was precipitated as AgCl which were then dissolved by ammonia solution. The Ag nanoparticles are synthesized from this solution by chemical reduction method by aid of sodium borohydride in the presence of PVP and PEG as stabilizers. The synthesized Ag nanoparticles showed a peak of 394 nm in UV-vis spectrum and TEM images showed a rather uniform Ag nanoparticles of 12 nm.

A new adding method of foaming agent used for foam dust suppression in underground coal mines

To realize a stable addition of foaming agent used for foam technology, a new adding method using the jet cavitation was introduced, and its performance was investigated experimentally under different operating conditions. Experimental results show that the bubble region in the jet device has a constant vapor pressure, which creates a good condition for liquid absorption, while it shrinks with increasing outlet pressure. The liquid absorption amount keeps unchanged when the outlet pressure is lower than a critical value. The critical outlet pressure increases by 40% with decreasing cavitation absorption amount, which is especially suitable for mini-flow quantitative addition of foaming agent used for foam dust suppression. Its effectiveness on suppressing mine dust was evaluated in a heading face of underground coal mines. Field application indicates that the reliable and simple foaming system adopting the new adding method makes a marked dust suppression effect. The working environment of heading face is significantly improved, ensuring the safe tunneling and personal security.

前列腺液B因子、C反应蛋白、转铁蛋白和免疫球蛋白与慢性非细菌性前列腺炎的关系

为探讨前列腺液 (EPS)中B因子、转铁蛋白 (Tf)、C反应蛋白 (CRP)和免疫球蛋白G、M、A与慢性非细菌性前列腺炎的关系。采用免疫比浊法检测 2 5例慢性非细菌性前列腺炎患者和 8例正常人的EPS标本。结果 ,各指标在二组中无显著差异 (P >0 .0 5 ) ,前列腺炎患者EPS白细胞水平同Tf、CRP和IgA水平均呈负相关 (r值分别为 0 .3372、 0 .36 77、 0 .3383,P均 <0 .0 5 ) ,而与B因子、IgG、IgM含量无相关性 (P >0 .0 5 )。作者认为Tf、CRP和IgA在前列腺慢性炎症病理反应过程中起重要作用 。

The Manuscript Drafting Journey of a NNE Scientific Writer： An Ethnographic Case Study

Given that there is a dramatic increase of the English manuscript submission rate of doctoral students, yet little research effort is devoted to this line, the author investigates the manuscript drafting strategies of one Taiwan Residents hydraulics major doctoral student, who was required by his department to have international publications for the qualifications for the degree. The study employs Ken Hyland＇s social constructionist approach to disciplinary writing and follows an ethnographic research method for the collection/analysis of the data. The results show that the participating student, in order to establish a professional persona for the heightening of manuscript acceptance possibility, followed some prescribed procedures such as citing higher potential journals, adhering to the expert model, and formulizing the research procedures/results. A conflicting rhetorical structure of literature review writing and the favor of doing applied research for publication purpose were also found in his writing. The author addresses the implicated meanings of these writing attempts and concludes that a ＂short-sighted operation＂ of writing attempts may undermine the value of a research. This study contributes to international scientific research communities＇ understanding of this group of writers＇ disciplinary knowledge construction and writing for publication.

Theoretical analysis of output speed of multi-pump and multi-motor driving system

A theory for multi-pump and multi-motor hydraulic systems is presented in this paper based on the analysis of the advantages and disadvantages of the popular hydraulic transmission and the double-stator motor(pump).By taking the single-acting fixed displacement multi-pump and multi-motor driving system as an example,the output speeds in a variety of connections of this novel hydraulic transmission are analyzed theoretically.This research work lays a theoretical foundation for the study of the multi-pump and multi-motor driving system and for the design of the system principle diagram.