烧结点火炉工艺参数的寻优与应用

在自行设计的烧结杯试验平台上,针对影响烧结点火工艺的几个重要参数开展了试验研究,并将相关研究成果应用于工业实际中。结果表明:降低点火温度、缩短点火时间均可降低点火燃耗,但烧结产品质量指标呈现变差的趋势,减小点火负压有利于降低点火燃耗并提升烧结矿产品质量;当点火温度低于950℃、点火时间短于0.75 min或者点火负压小于5 kPa时,烧结料表层混合料难以点燃,烧结反应无法发生;增加点火后的保温段有利于改善烧结矿质量,但保温时间过长也会对烧结矿产生不利影响,最佳的保温时间为2 min;本文成果应用于工业生产中,可有效降低烧结点火炉能耗约20%～30%。     

高炉煤气烧结点火保温炉

介绍了唐山钢铁公司炼铁厂烧结车间用高炉煤气作燃料的点火保温炉。生产实践表明,该点火保温炉是成功的,点火温度可达1150～1200℃,满足烧结点火工艺要求,烧结矿产、质量均有较大提高,经济效益显著。     

铁矿石富氧烧结点火试验研究

采用镜铁矿作为铁原料,通过改变天然气流量和氧气过剩系数以及氧气和空气的配比,在实验室进行了一系列点火烧结试验研究,重点考查富氧对烧结点火的影响。研究表明,富氧烧结点火能够降低烧结点火能耗和减少CO2的排放量,同时点火温度上升,烧结料层表面固体燃料的利用率提高,并可获得良好的烧结矿产量、质量指标。当天然气流量为2 m3.h-1,点火时间为1.5 min,助燃风为50%氧气+50%空气(体积分数),氧气过剩系数为1.9的情况下,烧结点火能耗为30.32 MJ.m-2,点火烟气中氧的体积分数为14.28%,所获得的烧结矿成品率和转鼓强度分别为72.32%和65.30%。与助燃风为空气,其它条件不变的情况比较,烟气中氧的体积分数提高了5.17%,烧结矿成品率和转鼓强度分别提高了10.59%和1.97%。     

烧结点火操作与节能

烧结过程是从点火开始的。点火过程进行得如何,不仅影响烧结生产的产量与质量,而且对能源的消耗有直接影响。本文依据1988年6月～7月间,对武钢烧结厂一烧车间的3号烧结机在正常、稳定生产条件下的多次测定数据,就点火操作控制条件与节能的关系进行了探讨。     

现代烧结点火保温炉的改造及发展

以双斜式点火保温炉为例,介绍并分析了近几年来烧结点火保温炉技术方面的改造要点,并对烧结点火保温炉未来的发展趋势作出了预测.     

现代烧结点火保温炉的改造及发展

以双斜式点火保温炉为例,介绍了近几年来烧结点火保温炉技术方面的改造要点并逐一进行了阐述分析.最后对烧结点火保温炉未来的发展趋势作出了预测.     

青钢煤气、空气双预热点火系统改造

青钢将原来的空气预热点火改造为空气、煤气双预热点火,通过高炉煤气燃烧产生的高温热量预热空气、高炉煤气后再进行烧结点火,从而减少了高炉煤气在达到燃点过程中吸收的热量,点火温度提高150℃,转鼓指数提高了1.48%,提高了烧结矿质量,年降低费用1053万元。     

承钢3＃烧结机点火形式研究

对比分析了承钢烧结机采用3种介质点火炉的烧结情况，并得出结论。从提高烧结矿质量出发以焦炉煤气为最好。但这主要取决于承钢的能源条件，如焦炉煤气紧张时采用高炉煤气为宜。采取综合措施，合理利用公司能源。     

莱钢 265m^2 烧结机点火制度的优化实践

介绍了莱钢 265m^2 烧结机通过对点火制度的优化实践，煤气单耗达到了国内一流指标水平，并一定程度上提高了烧结矿产、质量，取得了可观的经济效益。     

张钢提高烧结矿产量的实践

为提高烧结矿产量,张钢采取了改进原料混匀工艺,强化浊料制粒效果,改造吸风机开展堵漏风专项治理,加这台车;采用偏析布料技术,改造点火质量,推行原料层烧结技术以及严格执行设备点检制度和实施计划检修以提高烧结日历作业率等措施,使张钢烧结矿产量大幅度增加,各项经济技术指标明显改善。     

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.     

IQ and ego-resiliency: Conceptual and empirical connections and separateness.

The constructs of intelligence and ego-resiliency are discussed. The personality implications of "pure intelligence" and "pure ego-resilience" were identified. Intelligence (IQ) was indexed by the Wechsler Adult Intelligence Scale-Revised (WAIS—R) and ego-resiliency by an inventory scale. Residual scores measuring "pure intelligence" and "pure ego-resilience" were correlated with the items of the observer based California Q-sort, used to describe participants. Persons relatively high on ego-resilience tend to be more competent and comfortable in the "fuzzier" interpersonal world; persons defined primarily by raw IQ tend to be effective in the "clearer" world of structured work but tend also to be uneasy with affect and less able to realize satisfying human connections. Gender differences exist in the relations of ego-resilience and intelligence and in their adaptive relevance. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Conserving and retaining equalities and inequalities through observation and correction.

Investigated the effects of modeling and corrective feedback on the conservation of equalities and inequalities, with items spanning 3 stimulus dimensions (length, number, and 2-dimensional space). Ss were 48 kindergartners (24 boys, 24 girls). Brief observation of a model, briefer correction training (joining positive feedback with verbal rule provision), and the combination of observation and correction were all successful in producing learning and, without further training, transfer and retention of conservation. Unlike the controls (who also never correctly answered any equality items), the trained experimental Ss gave evidence of spontaneously generalizing their new learning to a task that required nonverbal behavior to manifest conservation. (17 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

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，