某尾矿库坝体稳定性分析

针对某尾矿库的现状,在现场调查的基础上,分析了尾矿初期坝和堆积坝坝体的组成结构,开展了尾矿工程特性研究和不同情况下的坝体稳定性研究,并探讨了坝体的灾害防治措施。研究结果表明：从放矿口至库内尾矿粒径由大变小,堆积尾矿由东向西整体上有西粗东细的特征;选取瑞典圆弧法、毕肖普法等对上游法尾矿库堆积坝稳定性进行分析比较,运用数值分析方法计算各种情况下尾矿坝的安全系数均大于1.25。为了保证坝体安全系数满足规范要求,必须保证坝体排渗设施安全有效运行,及时降低坝体浸润线高度。基于安全考虑,可依靠增加坝体自重和降低库内水位来减小坝体的滑坡风险。该研究成果能为尾矿库的灾害防治提供理论依据。     

尾矿沉积的不均匀性对坝体稳定性的影响

为了研究沉积特性对尾矿库坝体稳定性的影响,基于尾矿沉积不均匀特性的重要性,采用Slide软件对云南某尾矿库建立坝体的稳定性模型,来分析计算尾矿坝在正常、洪水、特殊工况下稳定性的可靠度及尾矿材料的敏感度。结果表明:尾矿库在正常、洪水运行条件下的可靠性指标符合规定,但是在特殊运行条件下的可靠性指标低于规范值,不满足安全生产要求。3种运行条件下,尾细砂对尾矿坝的稳定性影响最大。     

基于Slide的某钨矿尾矿坝稳定性及概率分析

尾矿坝的稳定运行是钨矿山安全生产的重要保障。研究结合某钨矿尾矿库的工程地质特征,采用Slide软件建立坝体的概化模型,通过Bishop法计算尾矿坝在正常、洪水及特殊三种工况下的稳定性,结合瑞典条分法对坝体的抗滑稳定最小安全系数进行校核。同时运用概率分析法,对安全系数在服从正态分布及对数正态分布下开展可靠性指数的计算,并得出坝体的失效概率。综合分析坝体的稳定性和概率分析的结果,认为该尾矿坝在三种工况下能正常运行但存在洪水漫顶和地震液化的隐患,并针对隐患提出相应的整改建议。     

温庄尾矿库尾矿坝渗流场的数值模拟

以温庄尾矿库尾矿坝为研究对象,采用GeoStudio数值模拟软件,考虑了尾矿坝饱和与非饱和情况下,对现状坝高(+2 310 m)在两种工况下(正常、洪水)的渗流场进行二维数值计算,得到了不同工况下尾矿坝的浸润线埋深、地下水的流速矢量云图、总水头云图和孔隙水压力分布云图等。根据计算结果,对温庄尾矿库尾矿坝的渗流稳定性作出评价,并提出了改善坝体渗流的措施,研究成果可为该尾矿库的安全运行提供参考。     

某尾矿库浸润线偏高探析及治理

随着矿山整合,打造绿色、和谐矿山的需求日益趋烈。矿山为极限利用矿石的可选性,就需进一步将尾矿粒度变细,将其有用成分最大化选别出来。湖南郴州某矿山主要生产钨、钼、铋和萤石等多金属矿,该矿山一在用尾矿库尾矿平均粒级dcp=0.038 mm,尾矿粒度-0.074 mm占82%,加之入库入量多,导致该尾矿库浸润线偏高、主坝和副坝坝坡面出现部分沼泽化现象。文章对该尾矿库浸润线偏高的原因进行探析和研究,提出清污分流、增设大口辐射井、排津盲井、垂直加水平联合排渗、初期坝实施水平排渗管、采用分级尾砂模袋法堆筑子坝等综合治理措施,将尾矿库浸润线有效降至控制浸润线埋深以下,坝体安全稳定性满足设计要求,进而保障了尾矿库的正常运行。     

基于Geo-Studio的黄山市某尾矿坝稳定性分析及加固设计

降雨是影响尾矿坝稳定性的重要因素,但大多数研究针对于降雨时的坝体稳定性变化情况,对停雨后的变化研究不足,本文基于Geo-Studio中的seep/w与slope/w模块,以黄山市某尾矿坝为例分析12 d内尾矿坝在降雨与停雨情况安全系数的变化情况,提示可能正常运行工况下安全系数满足规范要求的尾矿坝在洪水运行工况下有可能发生失稳破坏风险,且停雨后尾矿坝仍有可能会发生失稳破坏。通过采用坡脚压坡堆石进行治理是一种简单快捷的方法,治理后在洪水运行工况能满足要求。     

见龙坡选厂尾矿库稳定性分析

尾矿库是矿山生产过程中的重要组成部分,同时也是矿山主要的危险源之一。尾矿库的渗流是计算坝体稳定性最重要的指标,因此对尾矿库堆坝进行渗流计算和分析显得尤为重要。通过工程地质勘察,介绍了见龙坡尾矿库的基本情况,对见龙坡选厂尾矿库进行坝基稳定性评价,并对见龙坡选厂尾矿库进行尾矿堆坝渗流计算和分析、坝体抗滑稳定性计算。结果表明:见龙坡选厂尾矿库现状条件、洪水运行条件及特殊运行时均满足坝坡稳定的最小安全系数要求,坝体现阶段处于基本稳定状态,能确保矿山安全生产。     

河南嵩县小南沟尾矿库堆坝稳定性分析

河南嵩县柿树底金矿小南沟尾矿库属山谷型尾矿库,为了确保尾矿库安全,在收集场地已有资料的基础上,开展堆场工程地质条件分析,研究尾矿堆积坝排渗、排洪状况、堆积坝体渗流特征,选择代表性的断面开展浸润曲线分析和稳定性验算分析,综合分析评价堆积坝坝体稳定性。研究结果表明:坝体无沉降、塌陷迹象,坝体无纵横向裂缝、变形现象,无明显位移,未见渗水,坝区排渗及防洪设施完善。现状情况下,正常运行时坝坡抗滑稳定最小安全系数为1.897,稳定性较好;洪水运行时坝坡抗滑稳定最小安全系数为1.841,亦处于稳定状态;满足三等库坝坡抗滑稳定最小安全系数的要求,尾矿库运行符合安全生产条件。     

复杂地基条件下尾矿坝的稳定性分析

通过对某三等尾矿坝的工程地质概况进行分析,确定采用压重法、排水固结与预压加载相结合、并控制加载速率的方法,解决复杂地基条件下尾矿坝稳定性不足的问题,然后进行稳定性分析计算。结果表明,某尾矿坝在空库、初期及终期不同运行工况下的安全系数均能满足规范要求。     

尾矿坝动力响应仿真分析

尾矿库是矿山正常生产所需的重要设施,必须满足坝体稳定和防洪能力两项最基本要求。地震破坏是影响坝体稳定、造成尾矿库安全事故的重要因素,其对尾矿坝的破坏作用表现在惯性力的直接作用、引起坝体液化和造成的永久变形三个方面。以某尾矿库为例,在非线性静力有限元分析的基础上应进行了尾矿坝动力响应仿真分析。仿真结果表明,该尾矿坝地震加速度反应与动应力反应分布基本合理,地震过程中坝体不会出现液化现象,震后永久变形较小,地震过程中坝坡不会出现动力失稳,满足抗震要求。本文仿真成果可为尾矿库设计与优化提供了有力的理论支持,也为其它项目建设提供借鉴。     

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.     

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.     

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.     

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)     

Reasoning and food and contamination.

Examines strategies that are used to reason about food and contamination. In Exp 1, Ss refrained from choosing a substance that had been given a "poison" label when the intent of the labeler was ambiguous or malicious but preferred this substance when a rationale was provided that dispelled the implication that there once might have been contaminants present. Exp 2 was designed to compare the effects of safety on conditional reasoning in food and food-irrelevant contexts. When the safety issue was relevant to food in the form of contamination, Ss were most likely to use formal logic in reasoning. A similar pattern of responses was found in Exp 3 on tasks for which Ss' ratings of their experience of contexts were matched for plausibility, experience, and danger. Results are discussed in terms of an adaptive constraint that facilitates rationality in reasoning within the food domain (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。