变频器在企业生产中的应用

从变频器的使用入手,多角度分析了在使用变频器的过程中出现的一些故障和相应的处理方法,并对使用变频器提出了一些方法和建议。     

圆孔孔型设计构成方法探讨——指出几部孔型设计教材的几点失误

探讨圆孔的两种构成方法及其使用效果,指出圆孔构成方法的使用趋势。     

清洁手术抗菌药物预防使用情况分析

目的:了解清洁手术抗菌药物预防使用情况,分析存在问题,以促进抗菌药物的合理使用.方法:采用回顾性调查方法,对3种清洁手术(甲状腺手术、乳腺手术、疝气修补术)186例中预防用抗菌药物的使用品种、使用频率、使用时间等进行调查分析.结果:清洁手术抗菌药物预防使用存在多方面不合理性.结论:清洁手术抗菌药物预防使用需进一步规范管理.     

片状管式换热器在鞍钢的应用

介绍片状管换热器在鞍钢的使用情况。包括换热器型号、配置方法及其相应的使用效果,同时以两个使用实例逐一分析了换热器材质的金相组织、制造工艺、使用方法及破损原因,对如何提高片状管换热器的质量和正确地加以使用提供了依据。     

门禁控制器在机床使用权限中的应用

本文提出一种在门禁控制器基础上进行改进以用于机床使用权限管理的方法,改进内容包括对输入脉冲的去噪化,输出信号的放大化,翻转电路的设计,以及后台对机床运行状态监控的实现。使用结果表明,该方法稳定可靠,能有效地进行机床使用权限的管理。     

提高铸轧辊辊套使用效果的分析

在分析影响铸轧辊辊套使用效果因素的基础上,提出了提高铸轧辊套使用效果的方法和生产中的使用和维护措施。     

用Excel计算金属电热元件

介绍了应用Excel计算金属电热元件规格和长度的方法,并详细分析了三个可多次使用的工作表及使用方法.     

对企业合理纳税方法的探讨

针对当前企业进行合理避税中存在的一些错误认识,简要介绍合理避税与偷税的区别,并就企业进行合理避税常使用的8种方法进行了论述,以使企业在使用这些方法时把握前提、界线和尺度,防止和避免由于使用合理避税不当转变为偷税的情况.     

立式液压半连续铸造机的使用、维护及其改进

介绍我公司目前使用的立式液压半连续铸造机之结构特点,依据三年多的生产实践,总结该设备的使用维护方法,并针对存在的问题提出相应的改进方法。     

某矿高溜井刷扩施工方法的研究和应用

在高溜井施工中采用普通法、吊罐法等施工方法使用的越来越少,天井钻机施工溜井的方法使用的越来越多,目前基本上得到了推广和使用[1-3]。对于高度超过50m的溜井,本文通过分析研究,提出了溜井刷扩的新方法,较好的解决了传统方法的循环作业效率低、施工工期长的弊端。通过多次现场施工,实践证明该方法安全、高效的完成了高溜井刷扩。     

矿井通风中的回风井经济风速

通过理论研究,分别得出回风井通风费用和基建投资的计算公式,二者的和为回风井通风的综合费用。再依据以回风井断面为变量的建设投资函数,得到回风井经济断面以及经济风速的计算公式。以某矿山为例,根据国内现有经济技术条件计算得出一般条件下回风井的经济风速为8~11 m/s。     

Evaluation of plaque pH changes following oral rinse with eight infant formulas

Inappropriate feeding habits have been identified as major factors associated with the development of baby bottle tooth decay or nursing caries. An in vivo/in vitro combination technique was developed to investigated the plaque pH changes associated with rinsing with eight different infant formulas. These eight formulas represented four categories: 1) formulas with iron, 2) formulas with low iron, 3) soy formulas 4) and protein hydrolyzate formulas (from the manufacturers Mead Johnson Nutritionals and Ross Laboratories). All formulas had the ability to reduce the pH significantly below the pre-rinse plaque pH. Furthermore, the average minimum pH for formulas from the two manufacturers did not differ within each formula category except for the soy-based formulas, where, rinsing with Isomil produced a significantly lower plaque pH than ProSobee. These results suggest that infant formulas are acidogenic and therefore may play a significant role in the development of baby bottle tooth decay.     

Standard formulas of parenteral nutrition. A study of their use in a general hospital

The goal of the study was to evaluate the use of parenteral nutrition formulas with standardized g. of nitrogen, carbohydrates and lipids, and to analyze whether the nutritional requirements of the patients treated in our hospital were covered by said formulas or whether it was necessary to change and/or standardize a new formula. To do so, a review was made of 5.646 parental nutrition mixtures prepared in the Pharmacy Service and patterned by the Nutrition Service from April, 1991, to May, 1992, for 308 adult patients. The distribution of the mixtures by services, diagnoses and the frequency of the different standard formulas were studied, comparing standard formula frequency with that of non-standard formulas. Findings showed that 41.9% of nutrition mixtures were patterned in surgery, and the most common diagnosis, cancer, appeared in 24%. Of the mixtures, 67.6% were preestablished formulas, and 32.4% were non-standard formulas. The order of frequency among standard formulas was: basic standard formulas, stress formulas, initial formulas, peripheral formulas, hemodialysis formulas and low-volume formulas. All covered the nutritional needs of a large share of the patients for the different pathologies in which they were indicated. Nevertheless the question of designing a new formula to cover a greater number of situations was raised. Protocolization should take place rationally, to meet the hospital's most frequent pathologies, and effectiveness should be evaluated after tracking and checking each patient.     

An intraocular lens power calculation for high myopia

The accuracy of intraocular lens power calculation formulas for the axial high myopia were examined, especially regarding the point of the predictive refraction. We examined 170 eyes with axial lengths of 27 mm or longer, with postoperative visual acuity of 0.5 or more, and postoperative astigmatism of less than +/- 2D. Five formulas were tested for accuracy in predicting postoperative refraction. They were the L-SRK, SRK, SRK II, SRK/T, and Binkhorst formulas. The SRK formula tended to predict less myopia than the actual postoperative refraction. The SRK II and Binkhorst formulas predicted more myopia than the actual postoperative refraction. The best results were produced by the L-SRK and SRK/T formulas. The accuracy of the L-SRK formula predictions were measured for each of the four myopic levels. The same was done for the SRK/T formula. For both formulas, there was no statistically significant difference in accuracy of prediction for the four myopic categories. The two formulas are considered to be useful for high myopic cases.     

简便测定天文方位角公式的推证及方法探讨

根据天体定位三角形和球面三角公式、推导出一般天体地平坐标与赤道坐标表示的方位均公式，并利用计算儒略目的方法，推导出一般天体方位角计算公式中的有关参数．从而给出了测线方位角的实用公式．用该公式计算测线方位角简单、方便，有现代计算手段的配合，比常规靠查天文年历求算测线方位角效率要提高几倍到十几倍、生产、经济效益显著．利用该方法在线状工程测量中求定端边方位角具有很大的实用价值和推广、普及使用的意义．最后给出了利用该公式测算方位角的具体操作步骤．为生产单位应用该方法提供了方便条件。     

Iterative Formulas and Estimation Formulas for Computing Normal Depth of Horseshoe Cross-Section Tunnel

This note presents iterative formulas that can be used to calculate the normal depth for all types of horseshoe cross sections. Based on the principle of gradual optimization fitting, general estimation formulas were developed for direct computation of the normal depth for all types of the standard horseshoe cross sections. The estimation formulas have high accuracy for hydraulic designers to use in comparison with the accurate normal depths determined from iterative formulas, and the maximum relative error is less than 0.5%.     

Isoflavones, soy-based infant formulas, and relevance to endocrine function

For more than 60 years, soy-based infant formulas have been fed to millions of infants worldwide and studied in controlled clinical research. These products provide essential nutrients required for normal growth and development. The safety of isoflavones in soy-based products, including infant formulas, has been questioned recently owing to reports of possible endocrine effects in animals and in cultured cells. The literature offers no evidence of endocrine effects in humans from infant consumption of modern soy-based formulas. Growth is normal and no changes in the timing of puberty or in fertility rates have been reported in humans who consumed soy formulas as infants. Consequently, soy-based infant formulas continue to be a safe, nutritionally complete feeding option for most infants.     

Assessment of Time of Concentration Formulas for Overland Flow

Despite the importance of overland time of concentration on the design discharge, engineers are often bewildered by the array of formulas available in the literature without knowing the accuracy of each formula. This assessment covers nine formulas published between 1946 and 1993, which are intended for overland flow only that is subjected to uniform rain. The assessment compares the estimates from the formulas with experimental values that are derived under the same conditions for two surfaces: concrete and grass. The assessment shows that formulas that do not account for the rainfall intensity are only valid for a limited range of rainfall intensities. The formulas that account for the rainfall intensity generally show better agreement with the experimental data. Finally, the assessment gives two rankings of the formulas for the two surfaces in accordance to their accuracy as compared to the experimental data. The formula that has the best accuracy for both surfaces is the Chen and Wong formula.     

Role of hydrolyzed formulas in nutritional allergy prevention in infants

BACKGROUND: In recent years, more and more discussions have arisen with regard to the role of (partially) hydrolyzed formulas as standard feedings for infants with a high risk to have allergy. METHODS: This review is based on an extensive overview of the literature dealing with the subjects of allergy prevention and hydrolyzed formulas. RESULTS: Although breast-feeding should receive absolute priority in the nutrition of infants, the existence of artificial milk formulas as an addition to or replacement of breast milk is a necessity. In high-risk infants with a family history of allergy, we might consider a hypoallergenic formula instead of the classical start formulas to reduce the risk of allergy. From a nutritional point of view, these formulas should only be hydrolyzed as much as necessary. On the other hand, for the treatment of food allergies, the peptides of the semi-elementary infant formulas should be as short as possible. This can, however, have an impact on the nutritional value of the formula. Therefore, a difference is made between partial and complete hydrolysates. CONCLUSION: While a firm recommendation is not yet possible, physicians might consider partial hydrolysate formulas in high-risk infants if parents can afford the higher-cost option.