萍安钢高线穿水冷却系统技术改造

针对萍安钢高线生产的盘螺屈服强度偏低及屈服平台不明显的问题,进行了摩根穿水系统改造。改进了中轧、预精轧、精轧的穿水阀,采用摩根6代穿水冷却系统、低压多段,隔段隔阀开启。优化了穿水冷却工艺参数和轧制工艺参数,盘螺的屈服强度稳定在430 MPa、抗拉强度稳定在600 MPa以上,并且减少了缺陷部位的剪切量,提高成材率约0.2%。     

12mm热轧带肋钢筋三切分轧制工艺实践

在八钢小型材机组现有工艺条件下,尝试(Φ)12mm热轧带肋钢筋三切分轧制工艺技术的开发应用,探索解决提高产能及成材率指标的措施.结合切分轧制工艺特点,研究确定道次分配、活套改型、导卫设计方案, 并对设备能力进行强度校核,提出工艺设计要点.对试轧中存在的问题进行有效改进,取得理想效果,为更多规格的多线切分轧制奠定理论依据.实践证明,切分轧制优势明显.     

(Φ)12mm热轧带肋钢筋三切分轧制工艺实践

在八钢小型材机组现有工艺条件下,尝试(Φ)12mm热轧带肋钢筋三切分轧制工艺技术的开发应用,探索解决提高产能及成材率指标的措施.结合切分轧制工艺特点,研究确定道次分配、活套改型、导卫设计方案, 并对设备能力进行强度校核,提出工艺设计要点.对试轧中存在的问题进行有效改进,取得理想效果,为更多规格的多线切分轧制奠定理论依据.实践证明,切分轧制优势明显.     

20MnSiNb HRB400钢筋生产实践

针对微合金元素Nb的强化机理及宣钢棒材生产的工艺特点,研究了化学成分及轧制工艺参数对钢筋性能的影响,确定了钢筋的化学成分要求w(Ceq)≥0.39%,Nb的质量分数为0.02%～0.04%,轧制要求单线轧制不进行轧后穿水冷却,切分轧制轧后穿水冷却,冷却水量250～280 m3/h.通过回归分析,轧后不穿水时,钢中增加Nb的质量分数为0.01%,可提高钢筋屈服强度达17 MPa,抗拉强度15 MPa.工业化生产的20MnSiNb钢筋屈服强度达到了405～505 MPa,抗拉强度达到了585～655 MPa.     

同时轧制不同钢种和尺寸的线材轧制工艺

目前，多线线材轧机（带有一系列可多线轧制的轧机，以下简称多线轧机）通常把同一钢种和同一产品尺寸成组进行轧制。然而，随着近来客 户严格的交货要求以及小批量、多尺寸的发展趋势，轧制尺寸频繁变更，因而不可避免地降低了产量。新日铁公司改良了轧制控制设备以轧制多种具有不同性能的材料，开发了张力控制操作技术以及使用自动坯料编号读出器的跟踪系统，并先于其他公司建立了不同钢种和尺寸的线材轧制工艺。     

中厚板单机架生产效率的优化

国内某厚板线在生产初期采用单机架轧制,根据不同的轧制工艺参数可以采用交叉轧制和批轧。通过对多块控轧方式的分析,计算出了多块控轧的工艺条件,并给出了轧制小时能力的数学模型,为制定高生产效率的工艺参数提供了依据。     

圆钢多线切分轧制工艺开发

文章介绍了八钢在新建棒材生产机组进行多线圆钢切分轧制工艺的试验研究.通过对Φ12mm、Φ14mm圆钢的四线、三线切分轧制的压下规程设计、变形孔的延伸与宽展特点、切分孔型对轧件切分带形成的状况以及切分导卫对成品表面质量的影响因素等方面进行了分析论证,阐述了改进措施及实施效果.针对工艺特点设计了适应螺纹钢和圆钢共用的导卫、活套装置,并将粗中轧无槽轧与圆钢多线工艺进行有机结合,针对圆钢不同于螺纹钢多线切分轧制时表面质量难以保证的关键点,从孔型和工装导卫等方面制定有效措施,消除因切分带形成的质量缺陷,多线轧件成品断面的尺寸及椭圆度满足标准要求.     

Q345GJC高建钢拉伸试验不合格原因分析及改进措施

对Q345GJC高建钢的化学成分、轧制及冷却工艺、应力-应变曲线、金相组织进行了检验分析.分析结果表明:钢板在终轧结束后,未经过一段较长的弛豫时间就进入水冷设备进行水冷,且轧制及冷却工艺参数范围较宽松,产生了下贝氏体组织,导致了拉伸性能不合格.通过优化轧制及冷却工艺参数,严格控制各阶段温度,钢板终轧结束后弛豫30～60 s,然后再进入水冷设备水冷.改进后,50 mm规格Q345GJC钢板拉伸试验合格率由2016年的77. 3!上升到2017年的96. 2!.     

高颈法兰封闭轧制毛坯设计及工艺参数优化

基于环形件轧制理论以及轧制过程中金属体积不变规律,确定了高颈法兰封闭轧制毛坯的设计原则以及工艺参数的极限范围.通过有限元仿真模拟了高颈法兰封闭轧制成形过程,研究了工艺参数对轧制产品质量以及力能参数的影响规律,并确定了本文所研究高颈法兰的最优工艺参数.在D51-450型轧环机上采用自行设计的模具进行了轧制试验,并将试验结果与有限元模拟结果进行对比分析,验证了仿真结果的可靠性.      

穿水冷却设备关键部件的改进

昆钢棒线厂穿水冷却设备使用新备件后，轧制生产出现不稳定。在对国内穿水冷却设备进水体技术进行对比分析的基础上，结合棒线厂现状，制定并实施了进水体的改进方案，解决了出现的问题，达到改进目标。     

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。