Feasibility study for thermal protection by microencapsulated phase change micro/nanoparticles during cryosurgery

Although considerable progresses have been made in cryosurgery to treat tumor, thermal injury to collateral structures is still a known complication of cryosurgery. In this study, a new method was proposed to prevent the healthy tissue around the cancerous tissue from thermal injury by microencapsulated phase change micro/nanoparticles, in which the phase change materials (PCMs) with large latent heat and low thermal conductivity are microencapsulated by liposome and delivered to the healthy tissue by mainline, arterial injection, hypodermic injection or direct injection. The three-dimensional transient temperature field in human body containing one tumor and embedded PCMs in the surrounding healthy tissue was numerically studied. The effects of the PCMs concentration, the phase change temperature, the temperature range near the phase change point, the latent heat and the PCMs distribution (especially the number of sides that PCMs cover, and the distance between the PCMs domain and the cancerous domain) were further discussed. The computational analysis showed that embedding PCMs in the healthy tissue around the cancerous tissue can significantly reduce the cryoinjury to the surrounding healthy tissue. The result also suggested that not embedding the PCMs directly adjacent to the cancerous tissue will help to improve the protection efficacy.     

Densification of hot-pressed composite materials for diamond tools

A set of compaction equations suitable for final stage of hot-press forming and sintering is deduced, all physical parameters are analyzed, the analysis results are consistent with a part of empirical formulas. Composites for diamond tools are taken as the subject of the investigation. Under the conditions of hot-forming sintering, the priority is given to the research of the relation between heat capacity C _p at constant pressure. By combining analysis of the set of compaction equations, we performed differential thermal analysis (DTA) in the differential scanning calorimetry (DSC) mode of heat capacity at constant pressure of pure Co powder, composite powder that consists of 663Cu and 35% Fe-based powder, analyzed the relationship between C _p and composite densification, and modified C _p of matrix composites containing 35% Fe-based composite powder for diamond tools in the mode of mixing a rare earth to make it as similar to C _p of pure Co as possible. Such modified powder is used in practical hot pressing of diamond tool composites and guides it with a set of compaction dynamical equations to radically improve the stability of practical performance (bending strength, hardness, impact ductility, porosity) of powder metallurgy composites and compaction of diamond tool composites.     

Fabrication of carbon nanomaterials by atmospheric pressure microplasma

Atmospheric pressure microplasma was produced in a scanning electron microscope (SEM) chamber for synthesising carbon nanomaterials. The SEM observation is convenient for both adjusting the gap length and observing the electrode surface before and after experiments. After adjusting the gap length, the electrodes were housed in a small removable gas cell equipped in the SEM chamber and CH₄ discharge gas was introduced into the gas cell. It was found that the discharge was pulsated automatically because of slow discharge through a large ballast resistor and fast discharge through gas breakdown, even though a DC voltage was applied. The peak pulse current density was almost 60 kA/cm², the peak power density in the microplasma volume was approximately 555 MW/cm³ and the pulse width was 10 ns typically. Spherical and nanotube-like carbon nanomaterials were found on the cathode surface after microplasma discharge for 1? 5 s.With the discharge time increasing, the spherical substance changes into nanotube-like carbon nanomaterials.     

地震炮井综合测井仪的研制

地震炮井综合测井仪的成功开发使地震勘探钻井施工质量及HSE纳入了科学的量化管理,可以对井深、井位、炸药、雷管、环境污染及耕地损坏面积等进行量化监测,自动采集、存储、处理数据,并可通过移动通信或互联网将各种监测数据及时传送到主管部门.本文分析了地震炮井综合测井仪的结构,从数据采集、图像采集和数据的显示与传输等方面对综合测井仪进行了全面地介绍,并阐述了各种测量数据、井口现场图像数据的采集、传输方法.     

凡口铅锌矿井下主要工序的节电潜力分析

本通过对矿山井下主要用电工序的理想能耗和额定电耗的理论计算并与相应工序的实际电耗对比，取得量化后各工序节电潜力值，为矿山的节电技术管理和技术措施项目的制订及节电计划的拟定提供了具体的科学依据。     

对注射模配合零件中“避空”的分析

例举了注射模各配合零件中，20多例“避空”的实例，用以阐明“避空结构”在注射模各配合零件中的具体位置、尺寸、功能以及对模具质量和对制品质量的影响。     

Comprehensive Evaluation of Tahe Medium Gravity Crude

The comprehensive evaluation of Tahe medium gravity crude has demonstrated that this type of crude belongs to a intermediate base sour crude, featuring high vanadium content （103ppm）, high carbon residue content, low pour point, and low acid value. Based on the crude processing conditions at SINOPEC Luoyang Petrochemical Branch Company, a proposal on the appropriate process flow scheme for processing Tahe crude oil has been raised with the main ideas presented as follows. The IBP--175℃ fraction is not an ideal feedstock for catalytic reforming; the 75--250℃ fraction is a qualified feedstock for zeolite de-waxing; the 140--230℃ fraction can be used to manufacture the No. 3 jet fuel through appropriate distillation range adjustment and product refining; the 175--350℃ fraction can be directly used to manufacture No.-10 diesel through proper refining; the atmospheric resid boiling over 350℃is not suited to be used as the RFCC feedstock; the 350--520℃ vacuum distillate oil can be used as the FCC feedstock; and the vacuum residuum boiling over 520℃ is a good feedstock for manufacture of asphalt.     

A Comprehensive Utilization Process for Black Manganese-silver Ores by Pyrite Reducing Method

Accordng to many authors' Previous stUdies[l--41, Mn-Ag ores can be made use of by pyro-metallurgical and hydrometallurgical processes.The attfactive way to lltilize these ores is to dis-solve the manganese as soluble sulPhate, Purifyand use it to produce manganese or battery gr8demanganese dioxide. Manganese dioxide ores arestable in acid or alkaline oxidizing conditions,so the extraction of manganese must be carriedOu in reducing condition. Manganese can be ex-tracted frOm its dioxide ore…     

A comparison of CFD‐simulations and measurements of the temperature stratification in a mixing box of an air‐handling unit

This paper presents a comparison between CFD‐simulations and measurements of the temperature stratification in a mixing box of an air‐handling unit. We have used data from field measurements during a period of over a year for different outside temperatures. We performed two‐dimensional CFD‐simulations for four different outside temperatures with commercially available software. The measurements as well as the simulations show that the temperature difference between the upper part and the lower part of the duct downstream of the mixing box is considerable. It increases, as the outside temperature decreases. However, the discrepancies between the measurements and the simulations are large. The reasons for this are uncertain boundary conditions and modelling errors leading to an inaccurate simulation result. The stratification downstream of the mixing box implies large sensor errors and the use of the mixed air temperature for control and fault detection must therefore be questioned. Averaging sensors, which take a mean value over the duct section, can be used but do not consider differences in velocities and are therefore not accurate either. In order to, for example, use CFD as a tool to decide the optimal sensor location a more accurate model and more information regarding the boundary conditions is needed. Copyright © 2001 John Wiley & Sons, Ltd.     

基于SP2.0的输油管道泄漏定位系统

为减少输油管道泄漏造成的国家财产流失,解决不法分子打孔窃油不能被及时发现、定位的问题,研发基于SP2·0的泄漏定位系统。该系统通过负压波法、流量平衡法进行耦合并综合神经网络智能辨识的方法,准确判断出管道是否有盗油现象并准确定位出盗油点。在实际应用中技术效果良好,产生较大的社会经济效益,具有远大的推广前景。