φ3.3m石灰炉炉底转盘跑偏分析与改进

对φ3.3m石灰炉在生产过程中出现的跑偏现象,进行了现场测试和支承滚轮部件的受力分析,并计算出使炉底转盘径向恢复力大于其偏移力时锥形滚轮的最小锥角。进而依此对炉底转盘机构进行改进,使之在工艺操作因素波动的情况下,设备能保持正常运转。     

武钢高炉炉缸炉底技术管理

对武钢高炉炉缸、炉底技术管理的主要经验进行了总结。武钢通过抓好高炉炉缸炉底设计、高炉操作以及炉缸炉底日常维护管理，使高炉炉缸、炉底各部位热流强度均处在受控范围内，大大延长了高炉炉缸、炉底的使用寿命。     

现代高炉炉底炉缸结构

对高炉炉底、炉缸结构的主要设计趋势进行了阐述,并重点对炭砖炉底、炉缸结构的主要特点进行了讨论。认为德国SGL开发的各种不同高炉用炭砖和石墨砖,如普通炭砖、微孔炭砖、半石墨砖、微孔半石墨砖、石墨砖和低铁石墨砖等,可以适应和满足炉底、炉缸结构的设计和生产要求。     

三高炉炉缸、炉底浸蚀情况预测与分析

为了保障高炉安全生产，根据太钢三号高炉热电偶历史最高数据预测了炉缸炉底浸蚀状况，同时应用该软件分析铁水流动、耐材导热系数、死铁层深度和高炉异常对炉缸炉底的浸蚀影响，并得出炉缸炉底长寿的若干推论，对评价目前浸蚀状况和护炉及未来太钢长寿、高效高炉的建设提出若干参考意见。     

4^#120m^3高炉炉缸炉底侵蚀分析

4^#120m^3高炉停炉大修，其炉缸炉底侵蚀形状较炼铸造铁高炉发生很大变化，研究分析炉缸炉底侵蚀情况，对今后护炉工作具有重要意义。     

高炉炉缸炉底结构设计研究

简述了高炉炉缸炉底结构发展的过程及目前国外高炉炉缸炉底所采用的形式；介绍了鞍钢７号高炉炉缸炉底的设计情况，并总结了其采用的陶瓷杯结构和半石墨化碳砖的优点。     

莱钢2~#高炉炉底炉缸侵蚀分析与长寿改造

莱钢2#高炉因炉缸侧壁温度异常升高而停炉大修,在炉缸炉底拆除过程中,发现炉缸出现象脚侵蚀,炉底出现锅底状侵蚀等异常侵蚀现象。通过选用优质耐材、优化砌筑结构、完善炉底侵蚀监测系统,对高炉炉缸炉底进行了长寿改造,达到了预期效果。     

鞍钢11号高炉炉缸炉底侵蚀模型的开发与应用

对监视炉缸、炉底工作状态数学模型建立方法,如何应用该模型判断炉底、炉缸热面温度变化,推断1150℃等温线位置及炉缸的工作状态进行了介绍,并对该数学模型在鞍钢11号高炉上的应用情况进行了总结,确定鞍钢11号高炉炉缸、炉底温度场工作标准。     

鞍钢4号高炉炉缸炉底破损调查

鞍钢4号高炉采用自焙炭砖加陶瓷砌体的复合炉缸炉底结构,大修时对炉缸炉底的破损情况进行调查,结果如下：炉缸环形炭砖断裂基本不存在,蒜头状侵蚀较轻。破损的主要原因是渣铁熔蚀、冲刷和渗铁。     

环形炉炉底机械托辊异响的消除

分析了某钢管厂在调试过程中的环形炉炉底机械托辊产生异响的原因,对炉底机械的托辊定位进行了适当的调整,从而消除了托辊在调试运行过程中产生的异常声响,使问题得到解决。     

新型多功能液压翻卷机的设计研究

新型多功能翻卷机具有自行取卷、托盘升降、卡钳对中卡紧、钢卷翻转、辊道输送五种功能.介绍了该设备的结构形式和工作原理,并进行了受力分析与研究,对翻转缸的工作长度、作用力及摆角与翻转角间的函数关系进行了公式推导,并对液压系统进行了分析和阐述.     

卡罗塞尔卷取机大转盘力学性能分析

文章利用三维建模软件对结构复杂的卡罗塞尔卷取机大转盘进行了建模。在此基础上,利用有限元分析软件ANSYS对大转盘进行了最恶劣工况下的力学分析,直观展现了大转盘存在的应力、应变,为掌握卡罗塞尔卷取机的力学性能提供了可靠的理论分析依据。     

基于ZnO结瘤下SiC塔盘导热性能研究探讨

为了研究韶关冶炼厂铅塔燃烧室SiC塔盘的外壁在存在ZnO结瘤层下的导热性能 ,根据ZnO结瘤层的不同厚度 ,并结合对塔盘的热工测试 ,对铅塔燃烧室烟气向ZnO结瘤层的外表面的辐射传热以及通过ZnO结瘤层导入塔盘内的热量进行了详细的分析和推导 ,结果发现 :随着ZnO结瘤层的增加 ,ZnO结瘤层外表面的温度升高 ,而沿ZnO结瘤层传入塔盘内的热量急剧减少。当ZnO结瘤层厚度为 3 0mm时 ,传入塔盘内的热量为未结瘤时的 3 0 3 4%。这种情况将在很大程度上减少锌蒸气的产量以及降低锌蒸气的质量     

锌精馏炉平口塔盘的研制与应用

介绍了韶冶锌精馏炉平口塔盘的研制、加工、使用过程中出现的问题及解决措施。     

Placement of multiple and different stent types for very long dissections during coronary angioplasty

A coordinate measurement machine with laser probe was used to measure the vertical distortion of the casts produced by use of three types of impression materials (irreversible hydrocolloid, condensation silicone, and addition silicone) and two types of trays (stock and custom trays). Results indicated that all impression groups showed positive vertical distortion (ranging from 0.00566 to 0.30299 mm) at the edentulous ridges and palatal area. The amount of the vertical distortion was greatest at the palatal area and was followed by the high edentulous ridge and the low edentulous ridge. Addition silicone, with either custom tray or stock tray, was the most accurate impression material. Condensation silicone was more accurate than irreversible hydrocolloid in custom tray impression. However, in stock tray impression the irreversible hydrocolloid was more accurate than the condensation silicone. The results suggest that, with careful manipulation, irreversible hydrocolloid with stock tray impression may provide a satisfactory cast for fabricating the framework of a distal extension removable partial denture.     

锌精馏炉平口塔盘的研制与应用

介绍了韶冶锌精馏炉平口塔盘的研制、加工、使用过程中出现的问题及解决措施。     

Renal expression of parathyroid hormone-related protein (PTHrP) and PTH/PTHrP receptor in a rat model of tubulointerstitial damage

The effect of a meniscal bearing on knee laxity in anterior cruciate ligament-sacrificing total knee arthroplasty was evaluated in 7 cadaver knees using a knee testing device that measured knee flexion angle as well as laxity to medial-lateral, anterior-posterior [AP], and rotational loads. A standard fixed tibial component and mobile tibial components (AP sliding, rotationally sliding, and AP and rotationally sliding) were used to evaluate AP, rotational, and varus-valgus stability and maximal flexion and extension with the neutrally positioned and malrotated tibial tray. The AP movable components increased AP laxity, and the fixed component decreased rotational laxity significantly when compared with the normal knees. The rotationally movable components did not change knee laxities significantly even when the tibial tray was malrotated. No significant difference among the components was detected when the maximal flexion and extension angles were compared in the neutrally positioned tibial tray. Malrotation of the tibial tray decreased the maximal extension angle in the fixed component. This study showed that the rotationally movable component can achieve near-normal laxity regardless of tibial tray rotation, but AP mobility of the bearing produces AP laxity that could lead to implant failure.     

Patellar tracking after total knee arthroplasty. The effect of tibial tray malrotation and articular surface configuration

The effect of total knee arthroplasty (TKA) with neutrally aligned and malrotated tibial trays was studied in five fresh anatomic specimen knees. Patellar shift, tilt, and rotation, and the rotational position of the tibia were measured in normal knees and after TKA with the Ortholoc Modular knee system. Both semiconstrained and unconstrained articular surfaces were assessed in the neutral position and at anatomic, 15 degrees internal, and 15 degrees external rotation of the tibial tray. After TKA, the patellae shifted slightly medially in the early phase of knee flexion because the anterior lateral flange of the femoral component was longer than the lateral trochlea of the femur and because the tibia rotated internally. The raised lateral flange on the femoral component tilted the patella medially at full extension after TKA. The semiconstrained tray allowed minimal tibial rotation because of its articular configuration. As much as 15 degrees malrotation of the unconstrained tibial tray did not affect patellar tracking. The semiconstrained tibial tray in the neutral position had almost the same patellar tracking as the unconstrained tray, but at 15 degrees external rotation, the semiconstrained tray internally rotated the tibia, leading to medial shift of the patella. Although 15 degrees internal rotation caused external rotation of the tibia, the patella did not shift as much laterally, despite the increase in the Q angle.     

Summation in the chimpanzee (Pan troglodytes).

In this research, we asked whether 2 chimpanzee (Pan troglodytes) subjects could reliably sum across pairs of quantities to select the greater total. Subjects were allowed to choose between two trays of chocolates. Each tray contained two food wells. To select the tray containing the greater number of chocolates, it was necessary to sum the contents of the food wells on each tray. In experiments where food wells contained from zero to four chocolates, the chimpanzees chose the greater value of the summed wells on more than 90% of the trials. In the final experiment, the maximum number of chocolates assigned to a food well was increased to five. Choice of the tray containing the greater sum still remained above 90%. In all experiments, subjects reliably chose the greater sum, even though on many trials a food well on the "incorrect" tray held more chocolates than either single well on the "correct" tray. It was concluded that without any known ability to count, these chimpanzees used some process of summation to combine spatially separated quantities. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Reconstruction of mandibular continuity defects in dogs using poly (L-lactide) mesh and autogenic particulate cancellous bone and marrow: preliminary report

PURPOSE: This study evaluated the reconstruction of continuity defects in the canine mandible using a poly [L-lactide] (PLLA) mesh tray and particulate cancellous bone and marrow (PCBM). MATERIALS AND METHODS: Eight adult dogs were divided into two groups of four dogs each. In group A, each dog had a tray fixed with stainless steel wires on each side of the mandibular stumps with the concave surface of the tray attached to the inferior border of the mandible (U-fixation). In group B, the concave surface was attached to the superior border (inverted U-fixation). Each tray was filled with PCBM from the ilium. After the operation, the dogs were radiographed, and specimens were examined histologically at 3-, 6-, and 12-month intervals. RESULTS: All of group A showed good clinical healing and the continuity of the mandibular bone was regained within 3 months postoperatively. However, fibrous tissue had invaded through the area above the tray, resulting in a poorly shaped alveolar ridges. In group B, the dogs showed good bony regeneration with well-shaped alveolar ridges. However, two animals in this group had partial exposure of the PLLA mesh tray into the oral cavity. CONCLUSION: It is suggested that a combination of the PLLA mesh and PCBM grafts might be a useful technique for functional reconstruction of the jaw bone, specifically using method A (U-fixation) as a technique to reconstruct continuity defects of the mandible, and method B (inverted, U-fixation) as a promising method for alveolar reconstruction to make wearing dentures possible.