热风点火在济钢320m2烧结机的应用实践

介绍了济钢第二炼铁厂320m2烧结机实施热风点火的原因及改造过程,对项目实施过程中遇到的问题进行分析并提出了解决办法,对实施效果进行了评价.     

烧结热风点火助燃技术

通过对烧结机两种热风点火助燃方式的项目总结，简要介绍了烧结余热用于点火炉进行热风点火助燃的研究和实际效果。     

热风点火技术在济钢400m~2烧结机的应用

结合现场实际情况,对济钢400m2烧结机实施了热风点火工程改造。在环冷机2#和3#烟囱之间的烟罩上开口,安装管道,新增高温除尘器、高效耐高温助燃风机、调节阀门、钢结构支架、电气及仪表设备等。热风点火系统投用后,热风温度稳定在240～300℃,点火温度提高到了1100℃以上,混合煤气单耗降低了20.09%,年效益达370.33万元。     

利用热风降低300m^2烧结机点火能耗的探讨

介绍了燃料气的化学组成和煤气热值，通过热工计算，探讨利用热风降低点火能耗的途径。     

长寿热风阀的设计与研究

提出了长寿热风阀的设计概念,通过计算分析及工业实践,深入研究了与长寿热风阀有关的水冷却,耐火衬,密封及阀板结构等问题,讨论了长寿热风阀的相关问题。     

热风炉掉砖处理技术实践

高炉热风炉蓄热室、隔墙、拱顶等耐材,长期受温度应力作用,运行多年后极易出现掉落现象,掉落的耐火砖及破碎耐材,被高压热风吹送至热风阀阀槽内部,导致热风阀无法关闭,高炉被迫休风处理.本文对热风阀卡砖问题进行深入探讨,提出了一套创新的解决方案,为同行提供技术借鉴.     

风冷热风阀的开发

蒂森公司经过五年的研究,开发了一种用风冷热风阀代替水冷热风阀的新技术。1987年9月汉伯恩8号热风炉安装了一套风冷热风闷样品进行工业试验,一年后拆除,检查时发现设备完好。试验期间,对主要部位进行测量未发现异常。风冷热风阀的冷空气是从进入热风炉设备之前的冷风中分流出的,然后适当加压,以克服冷风经过热风阀时的压力损失。风冷热风阀的主要优点是:冷风在流过热风阀时被加热后,又能马上回到热风中去。因而,冷却热风阀时从热风中散发出的能量依然存留在热风炉系统中。     

莱钢提高热风阀寿命的实践

莱钢从1977年第一代620m~3高炉开始,热风阀就一直采用汽化冷却。热风阀由于其结构及冷却系统设计不合理,寿命一直较短,基本都在一年左右,最短的仅半年,最长的不过一年半。1993年6月,2号高炉(750m~3)投产,由于对热风阀及冷却系统作了改进,热风阀寿命大大提高,除1号热风阀因意外原因于1996年损坏外,2号、3号热风     

包钢5号、6号焦炉荒煤气放散自动点火的改造

针对20世纪90年代建成投产的包钢5号、6号焦炉现状,根据焦炉荒煤气导出系统的现有条件,在尽可能保留原有设备且焦炉不停产的状态下对原有荒煤气放散系统进行放散自动点火改造。对原有放散塔进行改造设计,以集气管压力为条件对点火器、点火阀、放散阀、拢火阀及灭火阀等进行自动控制。保证在焦炉荒煤气导出故障时实现放散自动点火,避免因荒煤气直接放散造成大气污染。     

高炉热风炉风冷热风阀的开发

在现代高炉热风炉设备中,根据设备选型和热风炉数量,一般装有3～6个热风阀用作热风炉闸阀、高炉热风管道阀门及用作围管的排风管阀门。这些阀的操作与设备设计和运行方式有关,一般热风温度在1000～1500℃之间,风压在2～5.5巴之间。到目前为此,绝大多数钢质焊接热风阀的冷却都是用水冷。所有西方国家也都是用水冷,只有苏联和几个东欧国家局部采用汽化冷却。热风阀用水冷时,热风中相当部分的热量通过热风和冷水的热传递进入冷水。经过热传递而受热的冷水在冷却系统中又重新冷却。从这种冷水中回收热能没有经济意义,因为,这种从热风阀出来的冷水温度只有30     

Voices of fear and anxiety and sadness and depression: The effects of speech rate and loudness on fear and anxiety and sadness and depression.

Two studies investigated the role of expressive vocal behavior (specifically, speech rate and loudness) in fear and anxiety and in sadness and depression. In the 1st study, participants spoke about personally experienced fear and anxiety-arousing and neutral events using 3 different voice styles: fast and loud, normal, and slow and soft. In the 2nd study, participants spoke about personally experienced sad or depressing and neutral events using the same 3 voice styles. In both studies, the participants' highest levels of subjective affective and cardiovascular (CV) arousal occurred when they spoke about the emotional events in a mood-congruent voice style: fast and loud in the case of fear and anxiety, and slow and soft in the case of sadness or depression. Mood-incongruent voice styles canceled the heightened levels of CV arousal normally associated with these negative emotions. The voice-style manipulation had no significant effect on the participants' levels of CV arousal during the neutral discussions. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Synthesis and analysis of mixed chlorinated-fluorinated dibenzo-p-dioxins and dibenzofurans and assessment of formation and occurrence of the fluorinated and chlorinated-fluorinated dibenzo-p-dioxins and dibenzofurans

Despite the use of multimodal therapy, higher-grade glioma is still uniformly fatal in the adult population. There is a considerable difference between the length of survival in each given patient, even within the same tumor type and malignancy grade group, suggesting that there are factors that might differentially influence outcome. To identify such factors, 107 patients with anaplastic or malignant glioma were retrospectively investigated. Clinical parameters and paraclinical data on the p53, mdm2, and EGFR genes at the DNA or protein level were evaluated by univariate analysis and Cox proportional hazards regression modeling. Kaplan-Meier survival estimation demonstrated that immunohistochemical positivity for mdm2 protein in patients with anaplastic astrocytoma or with glioblastoma multiforme was associated with a shorter survival time (p = 0.02). P53 gene mutations and immunopositivity for the epidermal growth factor receptor (EGFR) protein were not significantly related to poor prognosis. The Cox proportional hazards model revealed immunohistochemical positivity for p53, mdm2, or for both of them, the presence of postoperative irradiation, and the extent of surgical resection of tumor to be variables significantly associated with prolonged survival. EGFR overexpression, age over 60 years, and Karnofsky performance score below 40 points did not significantly shorten survival time. In conclusion, the present study identified immunohistochemically detected mdm2-protein overexpression as a statistically significant negative prognostic parameter in patients bearing anaplastic or malignant glioma. Association analysis of variables revealed a possible correlation between mdm2 and p53, which is also consistent with the biological interaction mode of both proteins in vivo.     

Sexuality and aging--usual and successful

BACKGROUND: As aging research increasingly reflects an effort to dissociate true time-driven changes from those that can be improved, sexuality in later life remains largely unexplored. Several problems are evident. There is a lack of normative data, a lack of a conceptual framework relating to the biology, psychology, and sociology of sex, and an attitudinal resistance that obscures the entire topic. METHODS: We conducted a three-part instructional series on major topics involved with sexuality and aging. We surveyed our group of attendees (n 158, average age 68 for males, 65 for females) before and after the series. RESULTS: A remarkably robust sex life was evidenced by both the men and the women, even until advanced old age. Yet, a substantially decreased involvement was reported from 10 years earlier. Despite current activities, people of both sexes wished they were participating even more than they currently were. Impotency was identified as the major negative feature for the men; relationship problems were for the women. A questionnaire 6 months after the series reported improved sexual attitudes, but no change in sexual activities from the earlier survey. CONCLUSION: Sexuality is a major quality-of-life issue which persists into old age. Our study showed that the usual sexual practices reported by our group were not considered by them to be ideal. The intervention of this instructional series provided improved sexual attitudes but not performance. Additional studies are encouraged.     

Spondylolysis and spondylolisthesis and sports

Spondylolysis and spondylolisthesis occur predominantly in the lower lumbar spine. Besides congenital defects such as predisposition of spondylolysis the correlation between competitive sports activities and an increased incidence of spondylolysis is proved. In early stages, complete healing can be achieved by conservative treatment (abstinence from sports activities for 3 months, orthesis). Persistence of pain, neurologic symptoms and progression of vertebral slipping are indications for operative treatment (reconstruction of the isthmus, dorso-ventral spondylodesis). The exercise tolerance depends on the extent of instability, progression of vertebral slipping and clinical symptoms. The limits of exercise tolerance vary among the individual athletes and require the decision of the physician. Backstroke swimming, abdominal and back muscle strengthening exercises, and types of sport involving smooth movements are advisable. Sports education in school is possible without restriction in patients with stable spondylolysis and in those with spondylolisthesis without unfavourable concomitant factors.     

Larks and owls and health, wealth, and wisdom

OBJECTIVE: To test the validity of Benjamin Franklin's maxim "early to bed and early to rise makes a man healthy, wealthy, and wise." DESIGN: Cross sectional analysis of sleeping patterns in a nationally representative group of elderly people, and longitudinal investigation of mortality. SETTING: Eight areas in Britain (five in England, two in Scotland, and one in Wales). SUBJECTS: 1229 men and women aged 65 and over who in 1973-4 had taken part in a survey funded by the Department of Health and Social Security and for whom data on sleeping patterns, health, socioeconomic circumstances, and cognitive function had been recorded. MAIN OUTCOME MEASURES: Self reported income, access to a car, standard of accommodation, performance on a test of cognitive function, state of health and mortality during 23 years of follow up. RESULTS: 356 people (29%) were defined as larks (to bed before 11 pm and up before 8 am) and 318 (26%) were defined as owls (to bed at or after 11 pm and up at or after 8 am). There was no indication that larks were richer than those with other sleeping patterns. On the contrary, owls had the largest mean income and were more likely to have access to a car. There was also no evidence that larks were superior to those with other sleeping patterns with regard to their cognitive performance or their state of health. Both larks and owls had a slightly reduced risk of death compared with the rest of the study sample, but this was accounted for by the fact that they spent less time in bed at night. In the study sample as a whole, longer periods of time in bed were associated with increased mortality. After adjustment for age, sex, the presence of illness, and other risk factors, people who spent 12 or more hours in bed had a relative risk of death of 1.7 (1.2 to 2.5) compared with those who were in bed for 9 hours. The lowest risk occurred in people who spent 8 hours in bed (adjusted relative risk 0.8; 0.7 to 1.0). CONCLUSION: These findings do not support Franklin's claim. A "late to bed and late to rise" lifestyle does not seem to lead to socioeconomic, cognitive, or health disadvantage, but a longer time spent in bed may be associated with increased mortality.     

Craniometaphyseal and craniodiaphyseal dysplasia, head and neck manifestations and management

Mechanical allodynia (MA) following hand injury is a well-documented clinical problem. The purpose of this pilot study was to examine the relationship between hand MA and the upper limb tension test (ULTT). The ULTT mechanically stresses the neural structures from the C5/6/7 neural foramina to the median nerve distally. This study examined 29 subjects with unilateral hand MA before and after a 2-week neural self-mobilization programme. There was a significant difference between the subjects' affected and unaffected sides when tested using the ULTT, both in reproduction of symptoms and in reduced range of motion of the ULTT. Following the self-mobilization program, there was an improvement in the range of the ULTT, and subjects reported a reduction in their symptoms. Complete recovery was not obtained in all cases. The results of this study suggest that the ULTT is a useful tool both in assessment and treatment of subjects with hand MA.     

深云立交桥梁检测及加固改造

根据深云立交桥梁的检测结果，对该桥目前的整体状况、工作状态，及其使用情况做出综合评价，对桥的病害原因进行了分析，并提出合理的加固方案。     

关于摩尔浓度及其与硬度转换关系问题的讨论

众所周知，国际单位制物质的量采用摩尔(mol)表示，近几年出版的给排水专业书籍，为了与国际单位制接轨，逐渐将摩尔的使用频率不断提高，被给排水技术人员广泛应用的新版给排水设计手册，将表示物质浓度的单位“当量／升”或“毫克当量／升”．改为mol／l或mmol／l，虽然编者对其基本单元定义作了说明，但在实际运用上仍会出现误解，     

《儿子与情人》的语码转换与男女二元对立

劳伦斯小说《儿子与情人》一个鲜明的语言特色就是标准英语和当地方言频繁的语码转换。莫瑞尔用方言来对抗妻子,而妻子坚持用标准英语,偶尔也用方言来讽刺、挖苦丈夫。语码转换反映了劳伦斯男女二元对立的哲学思想。