Technological condition in slurry electrolysis of high-silver galena concentrate

Effects of various technological conditions such as ρ (Cl -), ρ (Fe) T, pH value and temperature on the cell voltage, lead leaching rate and the cathodic current efficiency of the slurry electrolysis of high silver galena concentrate were studied, and the behavior regularity of lead and silver was investigated. As a result, the suitable condition was determined as: ρ (Cl -) 230?g/L, ρ (Fe) T 15?g/L, pH 1, temperature 70?℃, electrolysis time 6?h. Under such condition, adopting the cathodic current density of 150?A/m 2 and the liquid solid ratio of 15∶1, lead powder with a purity degree of 91.18% was got. At the same time, leaching rate of lead, leaching rate of silver and cathodic current efficiency amounted to 96.88%, 70.88% and 75.68% respectively.

Determination of Technological Condition of Diesel Engine PZ12V190B Using Fuzzy Method

This article has selected useful diagnostic parameters according to the running condition of PZ12V190B diesel, and built fuzzy vectors of this parameter by using the subjection function to establish a technological condition. By using a statistical method the standard vector has been obtained, so the diesel technological level can be determined by calculating the closing degree between the fuzzy vector and the standard fuzzy vector.

Application and Development of Electric Energg Storage Technology in China

This paper describes the background of disseminating and applying electric energy storage technology in China. Its present application status is introduced, including governmental support and guidance, analyses on economic benefits and typical projects, etc.

Effectiveness of Fiber Bragg Grating monitoring in the centrifugal model test of soil slope under rainfall conditions

Centrifugal model testsare playing an increasingly importantrolein investigating slope characteristics under rainfall conditions. However, conventional electronic transducers usually fail during centrifugal model tests because of the impacts of limitedtest space, high centrifugal force, and presence of water, with the result that limited valid data is obtained. In this study, Fiber Bragg Grating(FBG) sensing technology is employed in the design and development of displacement gauge, an anchor force gauge and an anti-slide pile moment gauge for use on centrifugal model slopes with and without a retaining structure. The two model slopes were installed and monitored at a centrifugal acceleration of 100 g. The test results show that the sensors developed succeed in capturing the deformation and retaining structure mechanical response of the model slopes during and after rainfall. The deformation curvefor the slope without retaining structure shows a steepresponse that turns gradualfor the slope with retaining structure. Importantly, for the slope with the retaining structure, results suggest that more attention be paid to increase of anchor force and antislide pile moment during rainfall. This study verifies the effectiveness of FBG sensing technology in centrifuge research and presents a new and innovative method for slope model testing under rainfall conditions.

Complement components of nerve regeneration conditioned fluid influence the microenvironment of nerve regeneration

Nerve regeneration conditioned fluid is secreted by nerve stumps inside a nerve regeneration chamber.A better understanding of the proteinogram of nerve regeneration conditioned fluid can provide evidence for studying the role of the microenvironment in peripheral nerve regeneration.In this study,we used cylindrical silicone tubes as the nerve regeneration chamber model for the repair of injured rat sciatic nerve.Isobaric tags for relative and absolute quantitation proteomics technology and western blot analysis confirmed that there were more than 10 complement components（complement factor I,C1q-A,C1q-B,C2,C3,C4,C5,C7,C8β and complement factor D） in the nerve regeneration conditioned fluid and each varied at different time points.These findings suggest that all these complement components have a functional role in nerve regeneration.

Application of decision tree to selection of MTBM for adverse geological conditions

So many potential risks can be identifed for application of trenchless technology especially using microtunneling methods.Unexpected changes in ground conditions,such as encountering boulders,tree roots,ground water and man-made structures such as old foundations are the principal geotechnical risks,which affect the selection of an appropriate microtunnel boring machine.On the other hand,the performance of each microtunneling technique will differ while encountering such conditions.Hence,predicting the potential hazards provides a better safety and risk management plan.In this study,a couple of potentially hazardous situation,which are commonly associated with ground conditions,were identifed and investigated.A decision tree aid methodology was proposed based on geotechnical risk assessment for selection of proper microtunneling technique.Based on the approach the most appropriate microtunneling technique has the minimum risk level either before or after hazards mitigation measures.In order to check the effciency of the approach in practice,selection of microtunnel boring machine for Hamadan sewerage pipeline project was evaluated.Accordingly,an earth pressure balance(EPB)MTBM was selected for the project.

Optimization of Screening Method for Feed Nutrition and Processing Conditions

On the basis of regressional relationship between nutritional indexes and technological conditions,when confronted with feed quality that contains multiple nutritional indexes,a comprehensive equation of evaluating feed quality was developed by using fuzzy mathematical method at first in this study,and then the optimum technological conditions were established by introduction of statistical frequency analysis method pursuant to the comprehensive evaluating equation mentioned above compared with conventional multi-aim nonlinear programming,this method can lead to easy solutions,and also can make adjustment of the importance of nutritional indexes to feed quality according to practical considerations.An example was given of soybean extruding to show how the method worked.

Preparation of a High-Performance Si_3N_4 Ceramic Using Self-Reinforcing Technology

The self-reinforced Si_3N_4 ceramics which contain Y_2O_3 and La_2O_3 additives have been prepared by hot-pressing. Under the optimum processing conditions, this material has the flexural strength of 960～1050MPa and the fracture toughness of 11.17～12.74MPa·m^(1/2) at room-temperature, and 720～780MPa and 22～24MPa·m^(1/2) at 1350℃. The effects of heat ing rate, sintering temperature, and holding time on the microstructures and mechanical properties are investigated. The experimental results show that an appropriate β-Si_3N_4 grain size and homogeneous microstructure can be obtained under the conditions of a heating rate of 10℃/min, sintering temperature of 1800℃, and holding time of 1h, which are advantageous to enhancing the mechanical properties. Crack deflection in large rodlike β-Si_3N_4 grains is a principle source of toughening.

Volatility spillovers,structural breaks and uncertainty in technology sector markets

This study uses the dynamic conditional correlation to investigate how technology subsector stocks interact with financial assets in the face of economic and financial uncertainty.Our results suggest that structural breaks have diverse effects on financial asset connectedness and that the level of bond linkage increases when the trend breaks.We see a growing co-movement between the technology sector and major financial assets when uncertainty is considered.Overall,our findings indicate that the connectedness response varies depending on the type of uncertainty shock.

Discussion on the Role of Computer Technology in Promoting Students’ Interest in Learning

This paper conducts the discussion on the role of the computer technology in promoting students’ Interest in learning. Students’ interest in learning is constantly evolving from low to high levels, through fun, fun and interest in three stages. In interesting stages, the interest of the student is associated with the external characteristics of the stimulus, such as the interest of the novel and interesting teaching content, and when these factors disappear, the interest will soon drop or even disappear. In the computer aided teaching process, the advancement independent study mechanism founds, this time the student community is regarded as the teaching main body, becomes the study the master, the student may act according to own study progress condition to carry on the content repetition study. From this perspective, this paper proposes the novel idea that will later promote the further development of the related subjects.

Pollution source identification methods and remediation technologies of groundwater: A review

Groundwater is an important source of drinking water.Groundwater pollution severely endangers drinking water safety and sustainable social development.In the case of groundwater pollution,the top priority is to identify pollution sources,and accurate information on pollution sources is the premise of efficient remediation.Then,an appropriate pollution remediation scheme should be developed according to information on pollution sources,site conditions,and economic costs.The methods for identifying pollution sources mainly include geophysical exploration,geochemistry,isotopic tracing,and numerical modeling.Among these identification methods,only the numerical modeling can recognize various information on pollution sources,while other methods can only identify a certain aspect of pollution sources.The remediation technologies of groundwater can be divided into in-situ and ex-situ remediation technologies according to the remediation location.The in-situ remediation technologies enjoy low costs and a wide remediation range,but their remediation performance is prone to be affected by environmental conditions and cause secondary pollution.The ex-situ remediation technologies boast high remediation efficiency,high processing capacity,and high treatment concentration but suffer high costs.Different methods for pollution source identification and remediation technologies are applicable to different conditions.To achieve the expected identification and remediation results,it is feasible to combine several methods and technologies according to the actual hydrogeological conditions of contaminated sites and the nature of pollutants.Additionally,detailed knowledge about the hydrogeological conditions and stratigraphic structure of the contaminated site is the basis of all work regardless of the adopted identification methods or remediation technologies.

TESTING TECHNOLOGY OF OXYGEN IN MINERALS WITH EPMA

EPMA has used to measure oxygen con- tent directly in recentyears. This paper discusses the fac- tors affecting the quantitativeanalysis of oxygen content and the optimal experimental conditions,and gives some measured results of oxygen content in corundums whichare collected from different geological situations.

Analysis and innovation of key technologies for autonomous underwater vehicles

As the mission needs of the autonomous underwater vehicles(AUV) have become increasingly varied and complex,the AUVs are developing in the direction of systematism, multifunction, and clustering technology, which promotes the progress of key technologies and proposes a series of technical problems. Therefore, it is necessary to make systemic analysis and in-depth study for the progress of AUV's key technologies and innovative applications. The multi-functional mission needs and its key technologies involved in complex sea conditions are pointed out through analyzing the domestic and foreign technical programs, functional characteristics and future development plans. Furthermore, the overall design of a multi-moving state AUV is proposed. Then, technical innovations of the key technologies, such as thrust vector, propeller design, kinematics and dynamics, navigation control, and ambient flow field characteristics, are made, combining with the structural characteristics and motion characteristics of the new multi-moving state AUV. The results verify the good performance of the multi-moving state AUV and provide a theoretical guidance and technical support for the design of new AUV in real complex sea conditions.

Indirect measurement technology of new energy vehicles? braking force under dynamic braking conditions

Currently,direct braking-force measurement under dynamic conditions requires a considerable modification to the vehicles and has poor compatibility because there are many types of vehicles.Thus,in this paper,an indirect measurement method of new-energy vehicles,braking force under dynamic braking conditions is proposed.The mechanical wheel and axle model at low/idling/high speeds is established using the piston-pressure formula,force transfer in the brake-wheel cylinder,relative movement between the wheel and the roller,among others.On this basis,the relationship between wheel braking force and roller-linear acceleration is further derived.Our method does not alter existing vehicle structures or sensor types.The standard sealing bolt is temporarily replaced with a hydraulic sensor for coefficient calibration.Afterward,the braking force can be indirectly calculated using the roller-linear velocity data.The method has characteristics of efficiency and high accuracy without refitting vehicles.

Study on Key 750-kV Transmission Technologies

According to the special environment conditions and characteristics of high altitude in Northwest China, the study on key technologies of 750-kV transmission and substation projects has gained fruitful results which are imperative not only to the construction of 750-kV transmission demonstrative project first in China, but also has laid a solid foundation for future UHV transmission constructions.

因地制宜发展新质生产力的必要性、科学性及着力点

因地制宜发展新质生产力是习近平总书记就如何发展新质生产力提出的新要求,为各地发展新质生产力提供了基本遵循、指明了方法路径。因地制宜发展新质生产力重要且迫切,体现在其为实现高质量发展提供强劲推动力、为推进中国式现代化注入新鲜活力、为培育国际竞争新优势把握新机遇、为完善现代化产业体系提供坚实支撑、为贯彻落实新发展理念指明前进方向。因地制宜是习近平总书记始终强调并亲自践行的方法论,是坚持实事求是的重要方法、是立足中国国情的现实选择、是统筹发展全局的前提条件、是避免产能过剩的关键举措。因此,因地制宜发展新质生产力应立足本地资源禀赋和优势条件,以整合科技创新资源,研发通用底层技术;释放数据要素潜能,推进区域协同创新;坚持全面深化改革,打通束缚发展堵点;调整优化金融供给,减轻企业融资压力;完善招才引智体系,锻造人才中坚力量为着力点,加快培育各具特色的新质生产力。

富油煤原位热解技术战略价值与科学探索

【背景】我国油气需求缺口大、供给制约多、煤炭绿色低碳转型任务艰巨,富油煤作为集煤、油、气属性于一体的煤炭资源,具有立足国内增加油气供给的巨大潜力。【进展】富油煤原位热解技术已在陕西榆林成功实施工程试验,目前仍处于探索阶段。其具备两大战略价值:一是弥补我国油气需求缺口,提高油气自主保障能力;二是变革煤炭开采技术,推动煤炭产业绿色、低碳转型发展。富油煤原位热解包括钻孔式和矿井式两种实践途径,目标是持续高效提取煤中油气资源,主要面临热解选区、加热技术与高效传热传质等难题。【展望】“四性”是原位热解技术研发的关键,包括地质条件适宜性、加热技术匹配性、传热传质有效性和热解安全稳定性。主要内容为:(1)从富油煤资源条件、地层封闭条件、水文地质条件和构造条件等方面阐明适宜富油煤原位热解的地质基础,揭示热辐射范围内围岩封闭动态稳定性的约束条件,为原位热解选址和工程设计提供地质依据。(2)深刻认识富油煤在温度、应力约束下的热物理性质演化行为,基于地质−工程条件论证原位加热技术适宜性,并针对煤层低导热特性开展高效加热工艺设计,通过风、光、电多种供能方式互补实现供热能源经济性。(3)地应力、大尺度煤体、焦油高黏度是制约原位热解油气运移、产出的主要因素,煤层致裂、载热介质优化与温压调控、焦油降黏轻质化是改善煤层传热传质性能和提高热解油气可产出性的潜在方法。(4)原位热解持续稳定运行依赖于全过程监测与动态预警,需要监测手段立体化、地质信息反演精准化、多相多场环境模型化、突变阈值预测预警等技术予以支撑。进一步探索与地质条件相匹配的富油煤原位持续高效热解关键技术,破解煤炭资源开发与地质环境之间的制约矛盾,是推动富油煤原位热解技术深入发展的关键。

高职制冷专业科教融汇的实践探索

科教融汇是职业教育发展的新方向。其核心在于如何“融”、怎样“汇”。顺德职业技术学院制冷与空调技术专业在多年政校企合作、产学研结合的实践基础上,初步形成了“产品价值链-人才培养链-技术平台链-创新价值链”四链贯通的科教融汇模式,将人才培养与技术创新有效链接,既实现了教学与科研的协同发展,也实现了专业与产业协同发展。

政府主导型科技基础条件资源融合发展:现状问题及监测体系

科技基础条件资源融合发展是实现高水平科技自立自强的重要保障。目前,我国由政府支持的重大科研基础设施、大型科研仪器、科学数据、生物种质与实验材料、国家野外站等五类科技基础条件资源发展及其开放共享取得了显著进展,但现有科技基础能力建设尚无法满足持续高水平基础研究的现实需要,现有科技基础条件资源的开放共享、融合发展均有待进一步提升。在界定科技基础条件资源融合发展内涵基础上,提出政府主导型科技基础条件资源融合发展的评价体系和分析框架。新时代对科技基础条件资源融合发展提出新的更高要求,应加强对现有科技基础条件资源融合发展状况的监测评估,掌握我国科技基础条件资源融合发展状况,为我国加强科技基础能力建设提供决策咨询和政策参考。