切分轧制技术在生产中的应用

概述了切分轧制的意义、切分轧制的方法及生产中实际应用的情况，最后对采用切分轧制提出了几点看法。     

切分轧制技术在钢坯生产中的开发应用

综述了切分轧制技术的发展历史及切分轧制新技术在钢坯生产中的开发和应用情况,说明了切分轧制的各种方法、特点及适用范围。     

切分轧制在围盘轧制生产线中的探索及运用

对于围盘轧制生产线，通过分析设备能力，解决好具体技术细节，加强切分工艺的技术知识培训，对暴露出的问题进行相应的剖析和改进、完善，借助于连轧切分轧制、老复二重双线轧制等成熟的技术，同样也能稳定运用切分轧制生产工艺，达到增产、节能、降低成本的目的。     

最佳辊楔切分轧制效果的研究

通过模拟实验和理论分析研究了各种参数对切分时轧件尾部不开裂，切分宽展，切分弯曲和切口质量的影响，并给出变形的计算式，从而可以获得最佳切分轧制效果。     

切分轧制技术的发展及应用

说明了切分轧制的技术特点,意义以及切分轧制的各种方法及其适应范围,综述了切分轧制技术的发展历史及国内外开发和推广应用切分轧制新技术的情况。     

圆钢切分轧制的孔型设计

基于金属塑性变形基本理论,以圆钢双线切分为基本实体模型,结合生产实践,对切分位置、切分方式的选择和切分孔型系统的设计参数进行了分析,并建立了预切分轧件和切分轧件的面积计算模型.     

三线切分时影响棒材张开角的几个因素

为稳定小规格带肋钢筋的三线切分轧制 ,对涉及棒材张开角的切分孔孔型诸角度进行了分析 ,通过对轧件受力状态的讨论 ,提出了诸因素与棒材张开角之间的解析式 ,指出满足三线切分稳定轧制时的棒材张开角应为 2°～ 3°,相应的孔型切分角为 30°左右 ,孔型外侧壁倾角应在 4 5°～ 5 0°之间 ,咬入角可控制在 7°～ 8°之间等。     

切分轧制在半连续轧机上的应用

分析了切分轧制的原理及其实施条件，介绍了半连轧机进行切分轧制的工艺，针对采用切分轧制工艺中出现的故障多、产品质量不稳定等现象，提出了各工艺环节应注意的问题。     

φ10mm螺纹钢三切分轧制的生产实践

简要介绍了淮钢集团连轧生产线φ10mm螺纹钢三切分轧制工艺，阐明了该规格三切分轧制地的工艺、调整、设备等方面的注意事项，指出了下一步改进和提高的措施。     

切分轧制技术的发展与应用

简要回顾了近年来切分轧制技术的发展过程，着重介绍了几种典型的切分轧制工艺及其应用，并分析了该技术的发展动向。     

Three-dimensional model of the fibrin(ogen) molecule and fibrin fibril

The paper deals with the three-dimensional model of fibrin(ogen) molecule and fibrin fibril, based on the electron microscopy data on fibrin(ogen) molecule and on fibrin fibril structure, data on symmetry of fibrinogen primary structure, on domain structure of molecule, on location of sites of polymerization and on the data on polymerization mechanism of fibrin.     

Expression of HLA-ABC and -DR locus antigens on human kidney, endothelial, tubular and glomerular cells

The distribution of the major histocompatibility complex antigens on the various cellular structures of the human kidney was analysed by using a modified Staphylococcus aureus Cowan 1 method. Conventional alloantisera and heterologous antisera raised against isolated molecules were used for the HLA-ABC antigens, whereas the HLA-DR (Ia) antigens were detected with heterologous antisera only. The HLA-ABC antigens were expressed on all types of kidney passenger leucocytes, on vascular endothelial cells, and on kidney tubular cells, but not substantially on the glomerular podocytes. The DR antigens were strongly expressed on (a fraction of) the passenger lymphocytes and on the kidney vascular endothelial cells, weakly on the passenger monocytes, but not measurably on the urine-producing apparatus of the kidney--that is, on the glomerular and tubular cells.     

Oxidative stress is found in amyloid deposits in systemic amyloidosis

PURPOSE: To investigate a method of diagnosing angiomyolipoma that contains minimal fat. MATERIALS AND METHODS: In six cases of angiomyolipoma with minimal fat, the attenuation on contrast material-enhanced and unenhanced computed tomographic (CT) images, the echogenicity on sonograms, the signal intensity on T2-weighted magnetic resonance (MR) images, and the gross configuration of the lesion were retrospectively analyzed. In 100 cases of renal cell carcinoma, the same parameters were analyzed, and results were compared with those of angiomyolipoma. RESULTS: When compared with the surrounding renal parenchyma, all six angiomyolipomas showed homogeneously high attenuation on unenhanced CT images, homogeneous enhancement on contrast-enhanced CT images, and homogeneous isoechogenicity on sonograms. Of the five angiomyolipomas examined with MR imaging, four were hypointense and one was isointense on T2-weighted images. All six angiomyolipomas protruded from the renal margin. None of the 100 renal cell carcinomas showed homogeneously high attenuation on unenhanced CT images, homogeneous enhancement on contrast-enhanced CT images, or homogeneous isoechogenicity on sonograms. CONCLUSION: In the kidney, homogeneously high attenuation on unenhanced CT images, homogeneous enhancement on contrast-enhanced CT images, and homogeneous isoechogenicity on sonograms are suggestive of angiomyolipoma that contains abundant muscle and minimal fat.     

炼钢厂生产管理信息系统的设计与实现

炼钢厂生产管理信息系统包括制造命令管理子系统、生产辅助管理子系统和工艺质量管理子系统.本文从软件工程理论出发,围绕数据库应用系统的开发,结合制造命令管理子系统的具体实现,主要介绍了生产管理系统在Oracle Developer中的设计思想及开发方法.     

Proliferation and differentiation of human trabecular osteoblastic cells on hydroxyapatite

In order to evaluate whether human osteoblastic cells differentiate normally on hydroxyapatite, we have compared the adhesion, proliferation, and differentiation of human trabecular (HT) osteoblastic cells on synthetic-dense hydroxyapatite and on standard plastic culture. We show here that initial HT cell attachment was 4-fold lower on hydroxyapatite than on plastic after 4 h of culture, and that normal cell attachment on hydroxyapatite was restored after 18 h of culture. HT cell proliferation was similar on the two substrates at 2-8 days of culture, but was lower on hydroxyapatite compared to plastic after 15 and 28 days of culture, as evaluated by DNA synthesis or cell number. HT cells cultured on both substrates produced an abundant extracellular matrix which immunostained for Type I collagen. The levels of carboxyterminal propeptide of Type I procollagen (P1CP) in the medium were lower in HT cell cultures on hydroxyapatite than on plastic. In addition, (3H)-proline incorporation into matrix proteins and the mean thickness of matrix layers were 52% and 26% lower, respectively, on hydroxyapatite compared to plastic after 4 weeks of culture, indicating that the total collagenous matrix synthesized by HT cells was lower on hydroxyapatite. However, (3H)-proline and calcium uptake expressed per cell was higher on hydroxyapatite than on plastic. The results show that human osteoblastic cells attach, proliferate, and differentiate on dense hydroxyapatite with a sequence similar to that of plastic. However, the growth of human osteoblastic cells is lower on hydroxyapatite in long-term culture, which results in a reduced amount of extracellular matrix, although matrix production per cell may be increased.     

Effects of ionizing radiation on cartilage: emphasis on effects on the extracellular matrix

In this report, we review data dealing with radiation effects on cartilage. More specifically, we emphasize on alterations caused in the extra-cellular cartilage matrix. Although radiation studies predominantly describe the effect on the structure of DNA and on the mitotic activity of cells, alterations caused by the effect on the non-mitotic activity can also be important. Cartilage, having an extracellular matrix composed of 2 major components, aggrecan and collagen, provides a good model to study this kind of radiation effects. The following topics concerning literature data are summarized: effects on the amount of matrix synthesized, effects on the activity of certain enzymes and effects on the structure and morphology of the matrix. Some new findings concerning the radiation effect on the size distribution of aggrecan-aggregate populations, de novo synthesized by chondrocyte cultures, either derived from calcifying or from non-calcifying cartilage, are given.     

热轧带钢头尾宽度模型控制优化

从带钢头尾宽度的工艺原理出发,从工艺、现场、设备特点及控制原理等方面对短行程控制(SSC)进行了分析,并针对太钢产品的实际特点,研究出不同种类的控制曲线,取得了明显效果。     

Delaying colostrum intake by one day has important effects on metabolic traits and on gastrointestinal and metabolic hormones in neonatal calves

Effects on metabolic and endocrine traits of feeding colostrum on d 1 and 2, then mature milk up to d 7, or glucose or water on d 1, colostrum on d 2 and 3 and then mature milk up to d 7 were studied in calves. Calves fed colostrum within the first 24 h after birth had significantly higher rectal temperatures, heart rates and respiratory frequencies than calves provided only water or glucose. Significantly elevated plasma nonesterified fatty acid and bilirubin concentrations on d 1 and 2 of life in calves fed only water on d 1 compared with calves of the other groups mirrored reduced energy intake. Fecal consistency was significantly higher during wk 1 of life, and gastrin and glucose-dependent insulinotropic polypeptide increased only on d 1 and/or 2 of life in calves already fed colostrum on d 1, expressing improved functioning of the gastrointestinal tract. Significantly higher plasma globulin levels up to d 7 in calves fed colostrum on d 1 than in those starting colostrum intake only on d 2 demonstrated significantly enhanced efficiency of gamma-globulin absorption. Furthermore, significantly higher circulating glucose, albumin, insulin, insulin-like growth factor-I concentrations and significantly lower urea levels in calves fed colostrum on d 1 compared with those fed colostrum starting on d 2 of life indicated stimulation of anabolic processes. In conclusion, colostrum intake by calves within the first 24 h of life is needed not only for an adequate immune status, but also to produce the additional important and favorable effects on metabolic and endocrine traits and on vitality.     

丹宁酸对锌电解电流效率的影响

对存在于硫酸锌溶液中的丹宁酸有机物对锌电解电流效率的影响进行了试验研究,结合生产实际对建矿以来工业生产中有关锌电解电流效率的相关数据进行分析,认为存在于硫酸锌溶液中的丹宁酸有机物极易在氧化介质和高温环境中被破坏除去,不会对锌电解造成危害和降低锌电解电流效率。     

利用自身优势谋求最大的发展空间

面对激烈竞争的市场,阐述了企业图生存发展必须发挥自身优势,走科技创新之路,不断进行技术改造与更新,实施产品的规模化、系统化和配套化生产,运用正确的经营战略开拓市场,靠质量和品种占领市场,靠技术进步扩大市场,靠严格的管理赢得市场,靠售后服务巩固市场,从而使企业不断发展壮大,永远立于不败之地。