CDY-25型电液锤参数的计算与分析

本文对CDY-25型电液锤的打击过程中下行参数与回程参数进行了分析和计算，重点计算打击能量，并与实验所得数据相比较，结果接近。     

苏家围子铁锌钼矿床铁矿体储量核算

本文介绍了苏家围子铁锌钼矿床铁矿体储量核算，工业指标的确定，储量计算方法，矿体的圈定，储量计算参数及计算方法。     

矿热炉参数计算的探讨

从传统的电炉参数计算公式出发，推导出符合实际的新参数计算方法，新方法大大减少了传统选择电炉参数的随意性，与实际紧密结合，可以有预见地设计和优化电炉参数，从而使电炉参数达到最佳的冶炼效果。     

径节制齿轮的参数还原与计算

介绍了齿轮测绘的一般方法和注意事项，对齿轮参数进行了计算，并与标准参数进行对比和确认。     

H型钢计算机辅助孔型设计系统的开发

采用模块编程技术，应用金属加工学原理、针对鞍山第一轧钢厂的现场条件，用ＶＢ语言开发了一个基于Ｗｉｎｄｏｗｓ平台的功能较强的Ｈ型钢计算机辅助孔型系统主要包括 和何参数计算、力参参数计算及ＣＡＤ参数化科等功能。     

浅谈排水管道水力计算参数的制约

本文分析了排水管道水力计算过程中所涉及到的参数。及各参数设计时相互之间的约束，并探讨了排水管道水力计算程序的研制及应用中应注意的问题。     

用Excel电子表格设计轻钢檩条

利用Excel电子表格进行一些复杂的计算，使得轻钢结构利用查表选型，变成公式计算，只要输入相关参数，所需的力学参数通过列出的公式自动计算出来，同时进行一些构造判断，并且结果能显示或打印成计算书，使枯燥复杂的查表计算变成更为精确的公式计算。     

钢丝电接触加热炉电热段的计算及其结构优化探讨

主要是建立钢丝电接触加热炉电热炉电热段各参数间定量关系式，同时对该段不同保温结构的热效率进行计算。在电热段选择各参数时，提出了新的计算程序，为达到电热段结构优化提供依据和方法。     

送粉式激光熔覆稀释率的分析模型及其影响因素

在分析送粉式激光熔覆过程中能量分配和粉末颗粒云对激光束衰减规律的基础上，通过建立能量平衡方程，推导出熔覆层稀释率与工艺参数、材料参数之间的定量关系表达式，系统分析了影响熔覆层稀释率的因素。结合相关的物理参数、工艺参数和金相检测的熔覆层宏观参数，用方程对稀释率进行了计算。与用金相法实际检测的稀释率相比，上述计算值虽高于实测值，但两者反映的规律是一致的，都客观地反映了激光熔覆工艺参数与工艺结果的关系，为熔覆工艺参数的优化、熔覆层质量的预测、评定和现场控制系统的设计提供了理论依据。     

园型散料起重电磁铁的优化设计

将园型电磁铁结构参数框图化简，推导出结构参数电磁力公式，做静态分析，提出铁芯磁化曲线工作点优选和极掌的参数优选、设计、计算，提高了园型电磁铁效率。     

Cardiopulmonary effects of a combination of medetomidine and butorphanol in atropinized pigs

Cardiopulmonary effects of a combination of medetomidine and butorphanol were evaluated in atropinized pigs. This combination unchanged the cardiac output and significantly lowered the oxygen consumption compared with base-line values. Although some statistically significant changes were recorded, both medetomidine and butorphanol did not have a marked effect on the cardiopulmonary parameters in atropinized pigs. It was indicated that the administration of the combination of medetomidine and butorphanol is relatively safe in atropinized pigs.     

提高难选锡铜硫化矿铜精矿品位初探

结合新型组合捕收剂Mac-10特性,针对现生产工艺中存在问题,开展了不同技术参数试验研究,并对局部流程进行整改,以提高铜精矿品位。在试验工作中进行了一系列试验研究,取得了一定效果。     

控轧控冷工艺对HQ钢组织性能的影响

实验用ＨＱ钢的控轧控冷实验表明，典型组织为多边形铁素体＋粒状贝氏体。终轧温度、终冷温度和冷却速度等工艺参数对钢材的组织性能有很大的影响，可以通过各参数的合理组合，在提高强度的同时又提高韧性。     

Effect of Thermomechanical Controlled Processing Parameters on the Microstructure and Properties of Q460q Steel

 Thermal mechanical control processing (TMCP), the combination of controlled rolling and controlled cooling, provides a powerful means of developing high-strength low alloy (HSLA) steels by intensive microstructural control. In the present investigation, the effects of TMCP parameters, consisting of the finish cooling temperature and the start rolling temperature in non-recrystallization region, on the final microstructure and mechanical properties of Q460q steel have been studied by tensile, Charpy impact tests, optical microscopy. The TMCP parameters for Q460q steel have been optimized by laboratory experiments. And the microstructure and properties of industrial product were coincident with the results of laboratory experiments.     

Evaluation of the genotoxicity data on caffeine

The potential health effects of caffeine have been investigated for over two decades in a variety of model systems including limited human populations. Thus, it is probably one of the most extensively studied natural occurring dietary chemicals. One area which has received a great deal of attention is the potential genotoxic property of caffeine. To better understand whether caffeine itself or in combination with other agents exhibits genotoxic effects, hundreds of research studies published over the past 5 years have been reviewed. These studies have utilized a number of animal, prokaryotic, eukaryotic, and mammalian cell culture model systems. They have investigated the effects of caffeine alone or in combination with other physical and chemical agents on many aspects of cell division, chromosome stability, toxicity, and mutagenicity. A number of effects have been observed. However, they usually appear after very high doses (> 1 mM) of caffeine in combination with genotoxins, and are usually specific to certain cell types and/or cellular parameters. Humans, on the other hand, consume much less caffeine in the diet, with peak serum levels in the micromolar range 10- and 1000-fold higher compared to levels in animal and cell culture models. Thus, it is difficult to implicate caffeine, even at the highest levels of dietary consumption, as a genotoxin to humans.     

Assessment of the effects of combination therapy with ciprofloxacin and fenbufen on the central nervous systems of healthy volunteers by quantitative electroencephalography

The potential effects of concurrent administration of fenbufen and ciprofloxacin on central nervous system activity in healthy young subjects were investigated by electroencephalography (EEG). Visual analog scales (VAS) were used to assess subjective measures of concentration, vigilance, tension, and irritability. When ciprofloxacin was administered in combination with fenbufen, none of the EEG parameters or VAS ratings measured were significantly different from those measured when the drugs were administered alone.     

Safety profile of the combination of verapamil and trandolapril

ADVANTAGES OF DRUG COMBINATIONS: The particular advantage usually sought with antihypertensive drug combinations is an improvement in blood pressure control. However, at least as important is a consideration of adverse reactions and the safety of the combination compared to monotherapy. VERAPAMIL AND TRANDOLAPRIL: The fixed-dose combination of the calcium antagonist verapamil and the angiotensin converting enzyme (ACE) inhibitor trandolapril consists of a sustained-release (SR) tablet formulation of verapamil, and an instant-release granulation of trandolapril, a prodrug of the active metabolite trandolaprilat. The two drugs are suitable for combined administration since the half-life, time to maximal plasma concentration and peak: trough ratio are very similar for each drug. ADVERSE EFFECT PROFILE: In randomized placebo-controlled studies adverse events were observed in 25.6% of patients on placebo, 34.2% on verapamil SR, 27.3% on trandolapril and 27.9% on the combination of 180 mg verapamil + 2 mg trandolapril per day. Constipation and cough, which are considered to be specific adverse effects, occurred in 3.4% and 2.4% of patients on monotherapy with verapamil and trandolapril, respectively, but in only 2.9% and 1.9% of patients on combination therapy, respectively. Electrocardiograph recordings have not shown a prolongation of the P-Q interval to > 200 ms (placebo 1.1%, verapamil 1.2%, trandolapril 1,8%, combination 1.2%). No specific changes were found in the laboratory parameters. CONCLUSIONS: In summary, the profile of adverse drug reactions of a fixed-dose combination of verapamil and trandolapril consists the typical side effects of the monocompounds. The frequencies of adverse events were equal to or even lower than those for the monocompounds or of placebo.     

The cardiovascular interaction between caffeine and nicotine in humans

In a placebo-controlled, double-blind randomized design, we investigated the cardiovascular interaction between caffeine (250 mg intravenously) and nicotine (4 mg chewing gum) in 10 healthy volunteers, both under baseline conditions and during physical and mental stress (standing up and mental arithmetic). Caffeine alone induced a significant increase in blood pressure associated with a decrease in heart rate, whereas nicotine alone increased both blood pressure and heart rate. The combination of caffeine and nicotine increased systolic and diastolic blood pressure by 10.8 +/- 2.0 and 12.4 +/- 1.9 mm Hg, respectively. This pressor response did not differ significantly from the calculated additive effects of caffeine and nicotine on blood pressure, measuring 12.9 +/- 2.0 and 14.2 +/- 2.1 mm Hg, respectively. Heart rate and forearm blood flow also showed a similar response when the combination of caffeine and nicotine was compared with the calculated sum. During physical stress (standing up), blood pressure, heart rate, and plasma catecholamines increased in the placebo test. The pressor response to standing up was less pronounced after the combination of caffeine and nicotine compared with the sum of the separate effects (combination versus sum: delta diastolic blood pressure, 24.7 +/- 1.9 versus 35.2 +/- 2.6 mm Hg [p < 0.01]; delta mean arterial pressure, 22.1 +/- 2.0 mm Hg versus 28.6 +/- 1.6 mm Hg [p < 0.05]). The plasma catecholamine response did not differ between the combination and the sum of both drugs. During mental arithmetic, blood pressure, heart rate, and forearm blood flow increased in the placebo test. The forearm vasodilator response to mental stress was attenuated by the combination of caffeine and nicotine compared with the sum of both drugs (combination versus sum: delta forearm blood flow, -0.1 +/- 0.3 versus 1.4 +/- 0.5 ml/100 ml/min [p < 0.05]). We conclude that the combined administration of caffeine and nicotine shows additive effects on cardiovascular parameters during baseline conditions but less than additive effects during sympathoadrenal stimulation.     

The combination of testosterone undecanoate with tamoxifen citrate enhances the effects of each agent given independently on seminal parameters in men with idiopathic oligozoospermia

OBJECTIVE: To evaluate the effects of combined tamoxifen citrate and T undecanoate treatment on seminal parameters in men with idiopathic oligozoospermia. DESIGN: Prospective randomized clinical study. SETTING: A state hospital tertiary clinic. PATIENT(S): Eighty oligozoospermic men were included in the protocol. INTERVENTION(S): Patients were randomized to receive placebo, T undecanoate (40 mg three times per day), tamoxifen citrate (10 mg two times per day), or T undecanoate plus tamoxifen citrate. RESULT(S): Tamoxifen citrate plus T undecanoate treatment produced a satisfactory improvement of total sperm number, motility, and functional sperm fraction after 3 and 6 months. Comparisons with other active treatment groups showed significantly higher increment values for motility and functional fraction, whereas aniline, acrosine, and free L-carnitine also were markedly better in the combination treatment group. CONCLUSION(S): These results indicate that the combination of tamoxifen citrate with T undecanoate not only improves significantly important seminal parameters but also compares favorably with the single treatments used. Therefore, this combination deserves a place as a first line of treatment in idiopathic oligozoospermia.     

The microstructure and properties of a quenched and tempered low-carbon-manganese-niobium steel

The effects of rolling parameters (deformation schedule and finishing temperature), cooling rate (direct quench and air cool), and heat treatment have been investigated for a low carbon-manganese-niobium steel. Microstructure was characterized by optical and transmission electron microscopy, and correlated with tensile and impact properties. The best combination of strength and toughness was obtained by controlled rolling low in the austenite temperature range, finishing close to the austenite-ferrite transformation temperature, and direct quenching. Such a treatment produces a fine acicular ferrite containing a substructure of subgrains and a high density of mobile dislocations. Subsequent heat treatment effects a very small strength increase due to the limited amount of niobium available for precipitation and due to partial recovery of the random dislocation substructure during aging.