厂房粘钢加固施工技术

本文介绍了在混凝土构件外部用建筑结构胶粘贴钢板或型钢，提高结构承载力的粘钢加固施工技术。该施工技术对构件外形尺寸及正常使用影响较小，施工工艺简便，加固周期短，质量易于控制，加固效果良好。     

HRB400热轧带肋钢筋脆断原因分析

通过对HRB400热轧带肋钢筋外形尺寸、理化指标的一系列检验分析，找出了造成钢筋脆断的原因，有助于今后该产品的质量提高。     

矿用螺旋肋锚杆钢筋的研制开发

为满足煤矿等支护用锚杆钢较高的强度和韧性,以及螺旋肋外形尺寸精度的要求,利用低合金原料和低碳高锰合金原料,采用轧后余热处理和热轧的工艺方法,成功开发出具有高强度和高韧性的矿用螺旋肋锚杆钢筋,满足了煤矿对支护用锚杆的性能、外形要求,为矿用锚杆提供了新的选择。     

浅谈三辊劳特式轧机800齿轮轴的改进

针对影响三辊轧机800齿轮轴使用寿命的原因进行分析，从改进备用齿轮轴：包括提高加工精度、表面硬度，改变外形尺寸等，到改用新材质备件，多方面采取改进措施，提高800齿轮轴使用寿命，满足生产需要。     

稀土复合变质剂对台车箅条使用寿命的影响

通过台车箅条外形尺寸优化、高温合金Mo元素的添加、稀土变质处理的分析,发现外形尺寸的优化和Mo元素的添加可明显提高箅条的高温强度,而采用钇基稀土复合变质处理,能显著提高算条的高温抗氧化能力和耐热性能,可成倍提高台车算条的使用寿命。     

圆钢轧制缺陷分析与处理

针对在轧制圆钢时出现的轧痕、折叠、翘皮、麻面、耳子、轴错、结疤、波浪弯、划伤、不圆度超标等表面和外形尺寸缺陷,分析出其产生原因,提出了相应的调整措施和处理方法,有效控制了圆钢表面和外形尺寸缺陷,提高了圆钢产品质量。     

热轧树脂锚杆钢筋尺寸波动分析及改进措施

针对安钢300半连轧机组生产热轧树脂锚杆钢筋外形尺寸出现持续波动现象,从加热温度、工艺参数设置、成品导卫装置、工艺基础条件等方面进行了系统分析,并提出了相应改进措施,最终取得明显效果。该产品无论从外形尺寸精度,还是钢筋平直度均得到了较大提高,同时锚杆钢筋实际成材率也由改进前95%提高到97%。     

高强度φ9.00mm螺旋肋预应力钢丝的研制

阐述了高强度Φ9.00mm螺旋肋预应力钢丝的生产工艺、力学性能和科学的几何外形。生产该钢丝所用原料是77B-1或S82BΦ13.00高线盘条。该钢丝用于建筑构件,可替代热轧带肋钢筋和冷轧带肋钢筋,简化构件生产工艺,节约钢材,降低构件成本,改善建筑结构,增大建筑物有效空间。     

抚钢3.0 t锭型优化设计

通过以矩形断面代替传统的方形断面，可使钢锭的外形尺寸设计更合理。在不改动轧钢车间原有设备的情况下，能提高产量，提高成坯率。同时，通过对铸模的合理结构设计，可使模耗大幅度降低，经济效益十分显著。     

24MnTi中强预应力钢丝的研制

为了改善建筑构件质量，用２４ＭｎＴｉ钢丝代替国内现行的Ｑ２３５钢丝，节少了钢材，并提高了构件的安全性，本文重点介绍了２４ＭｎＴｉ中强预应力钢丝的生产技术和应用技术。并概述了２４ＭｎＴｉ钢丝向冷轧带肋钢筋转换简况。     

基于ANSYS的高炉推移小车有限元分析

文章对高炉推移小车进行了设计,确定了小车的外形尺寸及选材。通过建立小车的三维模型,本文在ANSYS中对小车进行了有限元静力分析,得到了其在特定载荷下的应力图及车架变形图,进一步校核了小车的强度。最后得出小车满足设计要求的结论。     

The consequences of halo "error" in performance ratings: A field study of the moderating effect of halo on test validation results.

Performance ratings of 294 clerical workers in a validation study of clerical ability tests indicated that halo, measured as the standard deviation across dimensions, consistently moderated the relationships between dimension ratings and scores on valid tests. Greater halo resulted in higher validity coefficients, and also was related to higher performance ratings. In an additional analysis, statistically controlling for the effect of the overall rating on dimension ratings resulted in poorer validation results, with dimension ratings rarely adding additional variance to that of overall ratings. The results of this study contradict the traditionally held view of halo as a rating "error," and are consistent with recent laboratory studies that have found accuracy and halo positively related. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

基于高通量试验原理82B连铸坯组织形貌特征

 凝固组织形貌对铸坯宏观偏析的形成有非常重要的影响,并在一定程度上决定了铸坯后续的加工使用性能。基于高通量试验原理,引入分形维数和无量纲周长对82B帘线钢连铸坯凝固组织形貌特征展开分析。结果表明,对于连铸坯两侧中间区,窄宽度长区域取样方法得到的凝固组织面积率可近似等效为固相率;同时凝固组织整体形貌的分形维数随着固相率的增加而增加,但其无量纲周长呈现相反的趋势,故两者对凝固组织渗透率大小存在相反的影响作用;计算表明,实际铸坯组织的渗透率最小值对应的固相率为0.667。提出了一种基于实际铸坯分析凝固组织形貌特征变化规律的新方法,同时能为连铸末端电磁搅拌与轻压下等偏析控制技术的最佳作用固相率提供参考。     

冶金多孔介质结构的分形现象

采用计盒维数方法对典型冶金多孔介质－焦炭及焦矿床层的结构进行了分形研究,结果表明所研究的多也南结构存在分形现象,其分形计盒维数为１．６６－１．８１,焦炭多孔介质 计盒维数随焦炭孔隙率的降低而增加。     

模具钢电渣重熔铸坯凝固组织形貌的分形特征

为了更为精细化地表达及控制铸坯质量，以H13模具钢电渣重熔铸坯凝固组织为研究对象，引入分形维数对其主体形貌特征进行定量描述。结果表明，基于数盒子法计算得到的分形维数可定量表征凝固组织形貌的自相似复杂程度，其值从柱状晶向中心等轴晶先减小后增大；凝固组织分形维数可作为衡量铸坯偏析程度（偏析率大小）的指标，且分形维数越大，对应区域偏析率越小，偏析越轻；通过凝固组织分形维数、偏析率和偏析点平均面积与二次枝晶间距关系的研究发现，使用二次枝晶间距表征铸坯凝固组织形貌差异并由此反映偏析程度的方法存在局限性。     

125I plaque therapy for uveal melanoma. Analysis of the impact of time and dose factors on local control

BACKGROUND: 125I episcleral plaque therapy has gained wide acceptance for the treatment of uveal melanoma because of its potential to preserve vision, salvage the globe, and provide good local control. A rigorous analysis of the optimum radiation dose, dose rate, and overall treatment time has not been reported with this technique. METHODS: One hundred fifty patients with uveal melanoma treated with 125I plaques between 1982 and 1990 and included in the uveal melanoma study (UMS) database of the Wills Eye Hospital were analyzed. Mean patient age was 60.7 years (range: 17.7-84.6 years). Initial mean tumor size was 9.7 x 8.5 x 3.7 mm with a range of 4.5 to 21.5 mm in basal dimension and 1.2 to 11.8 mm in height. Mean dose to the tumor apex was 94.77 gray (Gy) (29.5-141 Gy). Mean dose rate to the tumor apex was 92.9 cGy/hr (10-292 cGy/hr); the mean dose to the base was 359 Gy (181-692 Gy); the mean dose rate to the base was 348 cGy/hr (112-893 cGy/hr); and mean duration of treatment was 124.7 hours (range: 28-333 hours) RESULTS: With a median follow-up of 68 months, there have been 33 local failures. Mean time to local failure was 19 months (range: 6-78 months). Actuarial local control is 81% at 5 years. Multivariate analysis demonstrates significant correlation of local failure with larger tumor dimension (P = 0.0046), close proximity to the optic disc (P = 0.0029), lower radiation dose to the tumor apex (P = 0.03), lower radiation dose rate to the tumor apex and base (P = 0.01 and 0.03), and longer overall treatment time (P = < 0.0001). CONCLUSIONS: This retrospective analysis reinforces the importance of dose rate, minimum tumor dose, overall treatment time, maximum tumor basal dimension, and proximity to the optic nerve in the treatment of uveal melanoma.     

Goal-directed and stimulus-driven attention in cross-dimensional texture segregation

Goal-directed and stimulus-driven control of attention was examined in a visual texture segregation task. Recent published reports have debated the existence and efficiency of goal-directed guidance of attention. Some of this research has focused on the apparent stimulus-driven attentional priority given to salient distractors, even when they are known to be irrelevant to the task. In the present study, subjects searched a texture array for targets defined along one dimension. These displays also included distractors created by variation in an irrelevant dimension. Targets were of three different overall shapes. On each trial, distractors could be the same shape as the target or one of the other two shapes. In two experiments subjects were informed of the overall shape of the target prior to stimulus presentation. In these experiments, distractors that did not match the overall shape of the target caused less interference than distractors that matched the target's shape. In the third experiment, subjects were not informed of the overall shape of the target. In this experiment all distractors caused roughly equal interference. The results of these experiments demonstrate that if subjects are given information about the overall shape of the target, they are able to use this information to reduce interference from distractors that do not match the overall target shape. While acknowledging some stimulus-driven interference, this illustrates a previously unexplored source of goal-directed guidance that can reduce interfering effects of even salient distractors and argues against purely stimulus-driven control of attention.     

The dynamics of assessment center validity: Results of a 7-year study.

The authors investigated temporal trends in the validity of an assessment center consisting of a group discussion and an analysis–presentation exercise for predicting career advancement as measured by average salary growth over a 7-year period in a sample of 679 academic graduates. The validity of the overall assessment rating for persons with tenure of 7 years, corrected for initial differences in starting salaries and restriction in range, was .39. There was a considerable time variation in the validity of both the overall assessment rating and the assessment center dimensions. In accordance with findings from research in managerial effectiveness and development, the interpersonal effectiveness dimension became valid only after a number of years, whereas the firmness dimension was predictive in the whole period and increased with time. For comparison, validity trends for 2 types of interviews and a mental test were also studied. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

电磁搅拌方式对A356铝合金凝固组织形貌分形维数的影响

利用分形几何中的分形维数定量表征了铝熔体经低过热度浇注和电磁搅拌作用下半固态合金浆料中初生相的尺寸细化和球化程度.通过OM、Matlab软件平台编制计盒维数法计算程序,研究半固态初生相α-Al形貌的分形特征和电磁搅拌方式对其形貌分形维数变化规律的影响.结果表明,合金的凝固组织具有分形特征,可通过分形维数对初生相尺寸细化和球化程度进行定量表征.初生相的形貌分形维数随搅拌方式由无搅拌、单向连续搅拌过渡到双向连续搅拌时,呈逐渐减小的变化规律,是一个降维的过程.在双向连续搅拌作用下初生相的分形维数最小,晶粒细化球化程度达到最佳