塘子凹矿段通风系统合理性及建设规划研究

通过对塘子凹通风系统存在问题的分析研究。结合矿山实际采用以工作面为服务核心建立通风系统。拟定出了目前、扩产、远景３个生产发展时期通风系统规划。研究结果表明，通风系统整后可取得良好的社会效益和经济效益。     

银山铅锌矿北山区深部通风系统改造

针对银山铅锌矿北山区深部通风困难的状况,分析了北山区通风系统存在的主要问题,为了适应生产发展的需要,结合矿体赋存条件和生产布局对原通风系统进行了改造,新系统投入运行后,深部我条件有较大改善,达到了预期目的。     

红透山铜矿红坑口通风系统剖析

本文叙述了该矿红坑口通风系统的现状、存在问题及解决通风防尘的措施。     

二滩粘土矿通风系统改造节能效果显著

介绍了昆明工学院与二滩粘土矿密切合作，成功地完成了二滩粘土矿通风系统改造。这一实践表明：对通风系统改造所采取的技术先进合理，获得了良好的通风效果和显著的经济效益。     

太阳能通风塔辅助通风的可行性探讨

自然通风具有无能耗、无污染等优点,通过对流体力学及矿井自然通风规律的研究,提出一种新的矿井辅助通风设备——太阳能通风塔,利用太阳能对安装于出风井处的太阳能通风塔内空气进行加热,使矿井进、出风井产生空气压力差,形成自然风流,辅助矿井通风,减少矿井通风机的使用频率,达到节约能源的目的。     

矿用隧道通风方法

本文简要介绍了矿用隧道与一般公路隧道的异同点、主要通风方式和今后的发展方向。     

对桦树沟矿Ⅰ矿体通风系统进行改造的几点建议

本系统阐述了桦树沟矿Ⅰ矿体通风系统目前状况及存在的问题,包括通风系统的运行,维护以及按设计要求随采场变化而调整该通风系统的过程中存在的问题等,并结合目前系统实际情况,应用通风理论的有关原理,提出了改造该系统的建议与方案。     

循环通风在掘进通风中应用可行性的研究

本文从理论上分析了循环通风在掘进通风中应用的可行性;在独头巷道掘进中实行循环通风完全能达到排尘的目的,不会造成烟尘在工作面上的集聚。另外,本文还对传统的局部通风风量计算方法进行了讨论,并提出了计算局部通风所需风量的新观点。     

数字化加热炉煤气和空气压力修正补偿算法及应用

数字化加热炉采用脉冲燃烧控制技术进行控制,与传统的采用比例燃烧控制技术的加热炉相比具有诸多优势。脉冲燃烧控制取消了传统比例控制所需要的流量调节阀和流量孔板等,通过控制煤气和空气主管道的压力来确保各区烧嘴在开启后就能在所设计的额定功率下正常工作。但是,当煤气热值和环境温度等发生变化时,必然会使煤气和空气系统的设计压力在实际生产过程中发生偏离,导致烧嘴功率偏离额定功率。针对此问题笔者提出了修正算法,可对上述因素所造成的压力偏差进行修正和补偿。运行实测结果证明了该算法的正确性和可靠性,同时也为同类加热炉的控制提供了成功的案例。     

冷、热风幕气幕式空调伞的实验研究和对比分析

介绍了一种营造局域舒适性环境的新型空调设备--气幕式空调伞,借助实验手段比较了两种空调伞的流场、温度场以及最佳高径比,并对有效空调区和舒适性进行了分析和比较.     

Effects of lithium on cAMP-dependent protein kinase in rat brain

The essence of the bromodeoxyuridine (BrdUrd)-flow cytometry (FCM) technique is that cells are labelled with the thymidine analogue BrdUrd. They are then allowed to progress through the cell cycle in a BrdUrd-free environment during the postlabelling time period. At a postlabelling time shorter than the length of the S phase (Ts), cells are fixed and prepared for FCM-mediated analysis of BrdUrd and DNA contents. From FCM-derived data, cell cycle kinetic parameters such as labelling index (LI), Ts, and potential doubling time (Tpot) can be calculated. Tpot is believed to be important in the evaluation of tumor aggressiveness and therapy response. Since LI is most commonly used together with Ts to calculate Tpot, it is important that both LI and Ts are independent of the time when cells are sampled. Several formulae to calculate LI and Ts have been presented. In the present paper, we deal with various formulae to calculate LI. These formulae differ in how they take into account unlabelled and BrdUrd-labelled cells in various fractions of the cell cycle. We present a new formula, which takes into consideration cells in the different fractions and thus makes LI theoretically independent of postlabelling time. Our results show that different LI values are obtained when different formulae are used to calculate LI. In addition, we show that the BrdUrd labelling period should be kept as short as possible.     

气流粉碎机在高压高比容钽粉中的应用研究

介绍了用气流粉碎机制备高压高比容钽粉的方法。采用DOE试验设计的方法对气流粉碎机制备高压高比容钽粉过程中的关键参数进气压力和分级轮频率进行全因子试验设计、实施、结果分析,确定了最佳的工艺参数,成功实现了气流粉碎机在高压高比容钽粉制备中的应用。     

Optimal pulmonary arterial blood pressure

Based on the principle of minimum power, a mathematical model of the functional state of the pulmonary circulatory and respiratory systems is presented. The optimization model minimizes the power expended by the right heart and respiratory muscles. The pulmonary diffusing capacity control mechanism is considered. Mean pulmonary arterial blood pressure and ventilation are determined depending on oxygen transport parameters for man under normal and chronic pathological conditions. Theoretical results are compared with clinical data.     

粉末冶金锻造变形力和密度计算

应用粉末烧结材料广义塑性理论,研究和建立了该材料的镦粗、复压、闭式模锻变形力和工件密度、尺寸计算式。分析了粉末烧结材料镦粗和复压工艺的致密效果,提出了闭式模锻工艺设计原则。     

不锈钢钢筋表面的滚压精整

提出了用连续滚压的方法对不锈钢钢筋进行表面精整。该方法具有生产率高、在线连续滚压、表面质量好等优点(滚压后钢筋表面粗糙度Ra0．2～O．4)。介绍了工作原理、运动参数、结构参数和力能参数的计算方法。给出了计算实例与实验结果。     

Transient Flow Caused by Air Expulsion through an Orifice

A pressurized water system may be subjected to high pressure surges because of the expulsion of a trapped air pocket through an orifice at the downstream end of the pipe. Results are presented of laboratory experiments, in which pressure histories were recorded for different upstream heads, air pocket volumes, and orifice sizes. The resulting pressure oscillation pattern was divided into two distinct stages: a first phase of low-frequency pressure oscillation during the air release, followed by a sudden pressure increase with water hammer characteristics when the water column reaches the orifice. The experimental results show that the duration of the first phase decreases substantially with increasing upstream head and orifice size, and increases with air pocket volume. A simple relationship was deduced, which agrees well with experimental data. The maximum pressure peaks, always observed in the water hammer phase, increased with upstream head and orifice size, whereas the volume of the air pocket appeared to be a less significant factor in the range investigated. A simple predictive equation was deduced based on Allievi–Joukowski results.     

蒸汽-空气管壳式换热器设计计算

介绍了蒸汽－空气管壳式换热器设计的主要公式，经实践验证它们有较好的实用性和可靠性。换热器蒸汽入口和出口温差小，压差小，管程传热面积大。     

Identification of the three-element windkessel model incorporating a pressure-dependent compliance

A new one-step computational procedure is presented for estimating the parameters of the nonlinear three-element windkessel model of the arterial system incorporating a pressure-dependent compliance. The data required are pulsatile aortic pressure and flow. The basic assumptions are a steady-state periodic regime and a purely elastic compliant element. By stating two conditions, zero mean flow and zero mean power in the compliant element, peripheral and characteristic resistances are determined through simple closed form formulas as functions of mean values of the square of aortic pressure, the square of aortic flow, and the product of aortic pressure with aortic flow. The pressure across as well as the flow through the compliant element can be then obtained so allowing the calculation of volume variation and compliance as functions of pressure. The feasibility of this method is studied by applying it to both simulated and experimental data relative to different circulatory conditions and comparing the results with those obtained by an iterative parameter optimization algorithm and with the actual values when available. The conclusion is that the proposed method appears to be effective in identifying the three-element windkessel even in the case of nonlinear compliance.