青海省旅游资源开发及规划的探讨

青海省的旅游资源丰富而又奇特，从高原的自然风光、奇异的民族风情和古老神秘的宗教文化方面总结了旅游资源的特点．对该区旅游资源开发的现状，开发条件（区位条件、客源市场条件、交通条件和旅游基地条件）作出了初步评价，提出了正确定位客源市场，逐步完善以西宁、格尔木为主的旅游城镇和过境中间站的配套设施及接待条件，集中财力重点建设以西宁为中心的东部综合旅游大区和南部江河源头探险旅游大区及五条旅游线路，大力开展对外宣传工作等措施     

铸造铁水的电渣精炼

本文介绍了电渣精炼铸造铁水的实验室和半工业性实验的结果。结果表明,电渣精炼过程的脱硫、去气、去夹杂对获得优质铁水,提高铸件质量有明显的效果。但脱磷效果不明显。精炼铁水球化效果好并可大量降低球化剂的消耗。因此,新工艺有可能代替传统的铸造铁水熔炼工艺。     

单位质量反应热对铝热法制备钛铁合金的影响

考察了单位质量反应热对不同目标钛铁合金实验结果的影响.利用SEM扫描电镜、EDS能谱分析、氮/氧/氢分析仪及ICP对合金进行了系统分析.结果表明:体系单位质量反应热增加,物料燃烧速率增大,但随着合金中钛质量分数增加而降低.单位质量反应热增加,渣金分离效果变好,有利于Al₂O₃夹杂去除,合金中Al,O质量分数逐渐降低.单位质量反应热一定时,随着合金中钛质量分数增加,渣金分离效果变差,与Ti结合的Al质量分数增加,合金中Al,O质量分数增大.单位质量反应热增加对制备钛质量分数高的钛铁合金反应速率、渣金分离效果及合金收率影响更为显著.     

基于SRCSM的装备无线分布式测试系统数据加密传输

在非对称加密技术的基础上,提出了一种自定位随机编码签名机制(SRCSM)。该方法将LR签名算法与随机编码相结合,通过软件逻辑对移动接收端及接收端通信时所处物理区域划定接收权限,防止无关人员或相关人员在非规定地点接收到加密信息,防止造成无意识泄密。简要介绍了SRCSM的基本内容,并将其与非对称加密技术相结合,搭建了装备分布式测试系统数据加密无线传输框架,实验表明采用SRCSM进行加密传输时,相比于无加密传输,测试最长耗时增加26.67%、测试总时增加46.67%、CPU使用率增加50%,测试可平稳进行;当丢包率较小,同时监听个数较大时,算法可将通信被监听概率降低5个数量级。     

Effect of Cr<Subscript>2</Subscript>O<Subscript>3</Subscript> addition on the oxidation induration mechanism of Hongge vanadium titanomagnetite pellets

As part of a research project to develop a novel clean smelting process for the comprehensive utilization of Hongge vanadium titanomagnetite (HVTM), in this study, the effect of Cr₂O₃ addition on the oxidation induration mechanism of HVTM pellets (HVTMPs) was investigated in detail. The results showed that the compressive strength of the HVTMPs was greatly weakened by the Cr₂O₃ addition, mainly because of a substantial increase in the porosity of the HVTMPs. The Cr₂O₃ addition marginally affected the phase composition but greatly affected the microstructural changes of the HVTMPs. Increased amounts of Cr₂O₃ resulted in a decrease in the uniform distribution of the hematite grains and in an increase in the Fe-Cr solid solutions (Fe_1.2Cr_0.8O₃ and Fe_0.7Cr_1.3O₃) embedded in the hematite grains. Moreover, the compact hematite was destroyed by forming a dispersed structure and the hematite recrystallization was hindered during the oxidation induration, which adversely affected the compressive strength. On the basis of these results, a schematic was formulated to describe the oxidation induration mechanism with different amounts of added Cr₂O₃. This study provides theoretical and technical foundations for the effective production of HVTMPs and a reference for chromium-bearing minerals.     

Temperature field analysis of two rotating and squeezing steel-rubber rollers

Rubber has strong nonlinear viscoelastic characteristic.Under effect of the periodically chan-ging external force, it will show the phenomenon of lagging deformation and mechanical loss, which means deformation lags behind stress changes and the situation of loss of work is caused by the hys-teresis.Loss of work will be transformed into thermal energy and makes the temperature of rubber and the object in contact with it rise, which will thereby affect the dynamic characteristics of the structure.Based on a pair of mutual rotating and squeezing steel-rubber rollers as the research ob-ject, the finite element simulation software Ansys is used in this paper to analyze the temperature field of the structure.As a result, temperature distribution characteristics of two directions are ob-tained.One is squeezing area along the direction of the wall, the other is along the direction of thickness of rubber.Then the influence of the rotating speed and the pressure between two rollers on temperature of rubber is analyzed.The temperature experiment of mutual squeezing contact steel-rubber roller is carried out on the experimental platform via using infrared thermal imager and infra-red thermometer.The experiment data are in accordance with the simulation results on regulation of temperature distribution as well as high degree of similarity on value, which shows the effectiveness of simulation.Research results are of great significance for temperature characteristic analysis of rub-ber structure.     

氯过氧化物酶与苯酚降解菌株的协同降解动力学研究

氯过氧化物酶(CPO)催化苯酚与H_2O_2发生过氧化反应生成邻苯二酚,能减轻苯酚对降解菌株的抑制作用,加快降解菌株对苯酚的生物降解.实验结果表明:在2 h内适量的H2O2存在时10 U/L的CPO可以使300 mg/L苯酚降解率达到67.85%,而CPO与降解菌株协同作用下苯酚降解率则可达到70.72%,比单一菌株降解率8.52%提高了62.2%.在降解体系中补充邻苯二酚进一步揭示了CPO氧化苯酚的中间产物有利于菌体细胞形成共基质效应,提高细胞的苯酚生物降解效率.降解动力学分析显示:在苯酚质量浓度为100~1 200 mg/L时,CPO与菌株协同降解体系的最大比降解速率qmax=0.000195 h-1,基质饱和常数Ks=1.0501 mg/L,基质抑制常数KI=5.1272 mg/L.     

薄板毛细渗透法测定粉体接触角和表面能成分

研究了用薄板毛细渗透技术测定氢氧化镁粉体表面改性前后的接触角和表面能的成分,基于不同探针液体的接触角获得的氢氧化镁固体表面能的成分彼此一致.由于改性氢氧化镁的表面能大大降低,致使除1溴代萘外的多种探针液体不能与其发生毛细渗透,即接触角>90°.依据1溴代萘的接触角可以求得改性氢氧化镁表面能的非极性成分,但要获得极性成分,尚需寻找表面张力更低的探针液体.     

Using Boiling for Treating Waste Activated Sludge

IntroductionSludge produced from treating domestic andindustrial wastewater normally requiresstabilization prior to its final disposal or use[1] .Treatment processes have been proposed either toenhance the efficiency of subsequent anaerobicstabilization a…     

对经济责任审计几个问题的研究

结合审计工作的实践，对目前开展经济责任审计的时机、审计方式方法、审计结果的运用等方面存在的问题，进行了探讨，以便更好的发挥经济责任审计在国民经济发展中的重要作用。