日本金属公司以特殊钢事业更进一步发展为目标

①极薄材料专用冷轧机 1952年该公司在日本最先引进了“ZR-16-111／2型12辊”森吉米尔冷轧机，开始了不锈带钢的生产，现在有6台森吉米尔轧机和KT轧机进行生产。这次新建的轧机是日本森吉米尔公司生产的全部使用最新技术的最新式20辊轧机．使用高刚性的组合式机架和板型传感轧辊、双As-U，是具有超高精度的板厚控制性、板型控制性的极薄材料专用的高速轧机。     

复二重轧机的高刚性改造

利用复二重轧机改造成无上横梁高刚性轧机的情况及实施应用效果。     

用AGC消除轧机刚度对板厚公差的影响

一、轧机刚度 轧机刚度(刚性),又叫轧机模数,也就是轧机刚性系数。轧机承受轧制力后,产生弹性变形,其变形曲线如图1所示,这条曲线称为轧机弹性特性曲线。     

复二重轧机机架改进及实践

通过对韶钢四轧厂复二重轧机进行改进，增加轧机机架的刚性，提高轧制过程稳定性，使产品质量和质量都得到进一步提高，取得较好效果。     

苏联老旧轧机的改造途径

1.800轨梁轧机的改造 据苏联库兹涅茨克钢铁公司报道,1976年该公司与列宁格勒轴承工艺研究所合作,对一台50年代建成的800轨梁轧机作了技术改造,取得了很大的经济效益。 该轧机具有以下特点:1)各工作机座牌坊均为开式结构,刚性很低;2)在中轧机上同时轧制两条轧件,工艺条件比较复杂;3)除精轧机外,所有轧辊轴承均采用     

新型无牌坊高刚度轧机的结构分析与研究

本文通过几种高刚度轧机的介绍，引出了一种新型无牌坊高刚度轧机，论述了该设备的特点，并对其具体结构进行了较详细的分析和研究。此种设备具有结构新颖，刚度更高，重量轻，调整方便，操作简单等特点。可供轧机设计与研究人员参考，有益于钢铁企业老轧机的改造。     

在小辊径多辊轧机上用单端有锥度的工作辊串动轧制法控制复合延伸的板形——难加工钢板高精度轧制控制（Ⅰ）

在轧制不锈钢这种变形抗力大、表面光泽度要求高的难加工材时，一般都用小辊径工作辊(WR)的轧机。小辊径工作辊，由于弯曲刚性低、轧制时容易挠曲．致使板形(平整度)恶化。为此，在选用多辊轧机的同时，还装备有多段支承辊(BUR)等多种板形控制方法。小辊径多辊轧机的板形控制技术，以前曾有过用20辊森吉米尔轧机的双AS-U功能和通过反向凸度辊，增加支承辊中间凸度的调整能力的报告。     

cw—1型无牌坊高刚度轧机

一、设计原理1.轧机的刚性及提高轧机刚性的意义:众所周知,在轧制过程中,轧机在轧制压力作用下,将产生弹性变形。不同结构型式的轧机在相同的轧制压力作用下产生的弹性变形是不同的,这说明不同的轧机抵抗弹     

KZ型高强度轧机性能参数测试的研究

空间自位型高刚度轧机具有空间自位性能，其空间自位性能使轧机四列滚动轴承每列和轧辊和向调节螺纹机构保持均载。因此，该轧机自位性能的自位程序直接影响到轧机轴承和轴向调节螺纹机构的工作寿命。本文作者对２６７２工厂２轧车间３５０空间自位型高刚度轧机轴向串动量和轴承座摆动量进行了现场在线动态实测，并对测试结果进行技术分析，进一步证实该轧机具有良好的自位性能。     

HC轧机——板形技术讲座之五

HC 轧机是七十年代日本日立和新日铁联合研制的新式轧机,所谓“HC”,即“High Crown”,是指该轧机具有优异的凸度和板形控制能力。由于这种轧机所具有的一系列优点,因此受到普遍重视,代表了现代轧机的发展方向。一、问题的提出一般四辊轧机较二辊轧机有一定的优点,四辊轧机的小辊径工作辊提供了降低轧制压力及能耗、减小最小可轧厚度的优点,而大辊径的支撑辊提供了足够的横刚性,使板材横向厚度公差得到改善。但是     

Early endoscopic findings of the upper respiratory and digestive tract in patients undergoing translaryngeal intubation for more than 24 hours

The large number of patients undergoing translaryngeal intubation justifies acquiring full knowledge of the complications that this invasive procedure may produce. The short-term problems that cause immediate complications (esophageal intubation, cuff rupture) are severe and do not escape notice. However, less immediate problems often pass undetected, although their presence may worsen the patient's outcome. Endoscopy allows the condition of the upper respiratory and digestive tract to be examined in order to detect and correct such problems. In this preliminary study, risk factors are analyzed and the lesions are described, classified, and quantified. Forty-seven adult patients were studied prospectively. In the first 24 to 48 hours of intubation, rigid endoscopy was performed under sedation using 0 degree and 30 degrees rigid endoscopes. The high rate of glottic edema (63.8%) was noteworthy because knowledge of this condition can be vital for preventing extubation failure.     

The effects of focal and diffuse brain damage on strategy application: evidence from focal lesions, traumatic brain injury and normal aging

The use of symmetric reversing electric field pulses in electrooptic studies of rigid macromolecules in order to determine the ratio between the permanent and the induced dipole moments is well established. Application of this method to studies of small macromolecules requires a field reversal time of only a few nanoseconds. No high current pulse generator capable of producing symmetric kV pulses with such a short reversal time is available for studies of small macromolecules in physiological salt solutions, but it has long been known how to make such reversing pulses that are asymmetric. In order to take advantage of the opportunity offered by the latter fact, we here present a theoretical analysis in the thermal domain of the electrooptic properties of solutions containing rigid macromolecules with axial symmetry when exposed to asymmetric reversing electric field pulses. The analytical expressions needed for quantitative determination of the ratio between the permanent and the induced electric dipole moments of rigid macromolecules using electrooptic data obtained employing reversing electric pulses with given asymmetry are presented. The feasibility of this new approach is demonstrated by including experimental electric birefringence data for a 12 kDa protein (segment 14 of alpha-spectrin from Drosophila brains) in near physiological salt solutions obtained using a coaxial cable pulser producing 2 microseconds long pulses with a reversal time of about 15 ns.     

Possible explanations for the tooth loss and cardiovascular disease relationship

Dynamics of proteins and membranes are usually investigated by red-edge excitation spectra and fluorescence anisotropy. In a viscous or rigid medium, the fluorescence maximum position changes with the excitation wavelength upon red-edge excitation. In addition to the shift in the emission maximum on red edge excitation, fluorescence anisotropy is also known to be dependent on the excitation and emission wavelengths in viscous media. However, this dependence has always been explained by the fact that the fluorophore is rigid, i.e. it does not display any residual motions. The aim of the present work was to check the validity of this latest assumption and to explain the possible origin of the dependence of the anisotropy on both the excitation and emission wavelengths. Therefore, we compared the results obtained from the fluorescence of the Trp residues of two alpha 1-acid glycoproteins (orosomucoid). One protein was purified by chromatographic methods (orosomucoid(c)) and the other was obtained with ammonium sulfate precipitation (orosomucoid(s)). Trp residues of orosomucoidc display free motions while those of orosomucoids are rigid. The general qualitative feature of the excitation anisotropy spectra recorded on both types of preparation is identical and resembles that obtained for other proteins containing tryptophan residue in protein. The fluorescence anisotropy measured across the emission spectra decreases for both preparations, indicating that this phenomenon is characteristic for fluorophores surrounded by a rigid microenvironment or by a microenvironment that displays motions. The fluorescence anisotropy variation across the emission and the excitation spectra is more important when the fluorophore possesses constrained motions than when it displays a high degree of freedom. Our results clearly demonstrate that the tertiary structure of the protein and the structure and dynamics of the microenvironments of the Trp residues are the origin of the dependence of anisotropy on the excitation and emission wavelengths.     

用于高速电气化铁路的刚性接触线

从刚性接触线与柔性接触线的分类和结构等方面进行了对比分析,提出了适合于地铁、磁悬浮等高速列车用刚性接触线的性能要求。并介绍了一种新型实用刚性接触线的加工工艺及优良性能。     

Spectral parameters for quantitative mobility contrast in NMR imaging of solid polymers

Different procedures based on parameters of the wideline NMR absorption spectrum are presented to obtain localized molecular mobility contrast for imaging of solid polymers. For this purpose a 1H-NMR imaging technique with magic sandwich echoes is used for acquiring localized wideline spectra. With samples composed of polystyrene and high impact strength polystyrene, and polycarbonate and low density polyethylene a spatial difference in NMR absorption spectrum lineshape and linewidth is displayed. Furthermore, the spatial distribution of rigid and mobile domains in a heterogeneous polymer can be derived from the NMR spectral components. It is demonstrated that a van Vleck moment analysis can be performed from spatially resolved magic echo decays. The second (M2) and fourth (M4) moments of the rigid components show considerable variation with the spatial composition of the investigated samples.     

Investigating the Effect of Slag on Decarburization in an AOD Converter Using a Fundamental Model

A high‐temperature thermodynamics model has been coupled with a fundamental mathematical model describing the fluid flow, where boundary conditions were chosen based on data for an industrial AOD converter. Using this model, the effect of both slag phases (a liquid part and a solid part) on the decarburization was studied. More specifically, the separation of chromium oxide to liquid slag as well as the effect of the amount of rigid top slag (solid)on the decarburization was investigated. The liquid slag was considered with respect to the uptake of chromium oxide, while the rigid top slag was only considered with respect to the increase of the metallostatic pressure in the steel melt. The results suggest that separation of chromium oxide to liquid slag results in a decreased decarburization rate. The same conclusion can be drawn with respect to the amount of solid top slag.     

Inclined Plane Studies of the Newmark Sliding Block Procedure

This study considers the shaking-induced displacement and dynamic response of a rigid block and deformable columns of soil on an inclined plane. This work demonstrates that because of the coupled dynamic response and sliding of earth masses, actual deformations in these systems can vary significantly from those computed in a rigid block analysis proposed by Newmark in 1965. The rigid sliding block procedure was found to be generally unconservative when the predominant frequency of the input motion is somewhat less or about equal to the natural frequency of the sliding mass (0.2 ? tuning?ratio ? 1.3). Conversely, the sliding block procedure is generally conservative when the predominant frequency of the input motion exceeds the natural frequency of the mass (tuning?ratio>1.3). While it was found that sliding surfaces might limit transmission of energy, high inertial forces can, nonetheless, develop in a sliding mass because of its stick–slip dynamic response. This was found to occur in many of the soil column tests when accelerations in excess of the yield acceleration were measured at the base of the sliding mass. Based on the results of this study, recommendations are made to aid practitioners in selecting an appropriate seismic slope deformation procedure.     

Theoretical and experimental investigations into dieless drawing

Some experimental and theoretical results are presented for the dieless drawing method. Because of the absence of a rigid die considerable flexibility is reached by this method. For example it is possible to achieve very high strains in one pass. Unlike in conventional drawing it is possible to produce parts with variable cross‐sections along the length by varying the drawing velocity appropriately. This is demonstrated theoretically and experimentally. To model this process a simple one‐dimensional disk model is suggested. The resultant temperature distribution is compared with previous calculations.     

Stability of maxilla downgrafting after rigid or wire fixation

PURPOSE: This article compares the long-term outcomes of rigid internal fixation with wire fixation. PATIENTS AND METHODS: In this retrospective study, nine cases of vertical midface augmentation in which rigid fixation was used were compared with 11 cases with wire fixation. One surgeon completed all cases for the rigid fixation group, and another surgeon completed the cases in the wire fixation group. RESULTS: Follow-up was 16 +/- 11 months for the rigid fixation group and 20 +/- 12 months for the wire fixation group. Inferior movement at the anterior portion of the maxilla was 7.0 +/- 2.9 mm with rigid fixation and 4.5 +/- 3.6 mm with wire fixation (P < .05). Postsurgical superior movement (relapse) was 0.4 +/- 0.4 mm with rigid fixation and 2.4 +/- 2.4 mm with wire fixation (P < .01). Inferior movement at the posterior maxilla was 3.1 +/- 0.2 mm with rigid fixation and 2.8 +/- 2.3 mm with wire fixation. Postsurgical superior movement (relapse) was 0.8 +/- 0.4 mm with rigid fixation and 0.5 +/- 2.3 mm with wire fixation, which was not significantly different. CONCLUSION: This comparison showed downgrafting of the maxilla using autogenous bone harvested from the iliac crest and rigid internal fixation to be a predictable and stable procedure.     

棒材半连轧生产线的技术改造

介绍了深圳华美钢厂棒材半连轧生产线工艺、设备及精轧区电控系统的技术改造。在改造中取消了原生产线上的围盘轧制 ,形成了连轧工艺 ,选用了高刚度短应力线轧机以及西门子全数字 6RA70控制装置。整个改造工程历时三个月 ,投资 30 0万元 ,一次试车成功 ,当月即达到设计能力 ,月产 2 5 0 0 0