白钨矿浮选研究进展

概述了白钨矿的资源现状,白钨矿与含钙脉石矿物的可浮性差异,介绍了白钨矿浮选药剂与浮选设备的研究进展,为白钨矿高效回收利用提供一定的参考。     

白钨矿常温浮选抑制剂遴选试验研究

白钨矿与常见的含钙脉石的可浮性十分相近。为实现该类矿石的常温浮选,进行了单矿物浮选试验,通过对多种抑制剂及抑制剂组合在不同溶液环境下对含钙矿物浮选行为的影响分析,遴选出Fe SO4+硅酸钠的组合抑制剂。在抑制剂遴选试验的成果上,对云南某白钨矿资源进行了可选性研究,在p H=10.5、采用733作为捕收剂的条件下,通过6次精选、2次扫选得到钨精矿品位为63.17%、钨金属回收率86.32%的试验结果,实现了方解石-萤石类型白钨矿的常温浮选,验证了抑制剂遴选试验的准确性。     

高效组合抑制剂Y88白钨常温精选工艺研究

研究以湘西金矿白钨浮选为具体对象，叙述了白钨常温精选过程中，采用高效选择性组合抑制剂Y88有效抑制了脉石矿物，实现了白钨与含钙脉石矿物的有效分离，获得含WO3品位达72．8％，回收率为84．85％的优质白钨精矿。     

水玻璃对3种典型含钙盐类矿物的浮选性能影响

在白钨矿的浮选中,常使用水玻璃为抑制剂.通过3种典型含钙盐类单矿物浮选试验,得到水玻璃对3种含钙矿物浮选性能的影响,为在生产实践中使用水玻璃作抑制剂提供了一定的理论基础.结果表明：水玻璃对3种含钙矿物有选择性的抑制作用,抑制能力大小顺序为：萤石>方解石>白钨矿.以江西某白钨矿为试验对象,使用OXB作为捕收剂,在闭路浮选流程中,获得含WO358.38%、回收率82.10%的精矿,验证了单矿物浮选试验的结果.     

湖南某白钨矿选矿试验研究

以高钙白钨矿为研究对象,针对矿石中与白钨矿可浮性相近的含钙脉石矿物含量较高的特点,对WO_3含量为0.296%的原矿进行常温粗选-加温精选全流程闭路试验,常温粗选段使用对含钙脉石矿物抑制力更强的改性水玻璃为抑制剂,粗选段和精选段均采用选择性好,捕收力更强的新型捕收剂ZL,获得WO_3品位为69.54%,回收率为87.30%的钨精矿,取得了理想的试验指标。     

新型小分子抑制剂在白钨矿浮选中的应用研究

脂肪酸和水玻璃是白钨矿浮选中的经典浮选药剂,在国内外大型白钨矿矿山中广泛应用。水玻璃可以有效抑制硅酸盐、方解石等典型脉石矿物,但是用量极大（6～10 kg/t）,不仅会抑制部分白钨矿矿物上浮,也会导致一系列废水净化和回水利用难题。本研究针对这一难题,设计开发新型小分子抑制剂CS,取代大部分水玻璃,并以湖南某白钨矿为研究对象开展选矿试验研究。结果表明：新型小分子抑制剂具有良好的选择抑制能力,可高效吸附于方解石表面;常温浮选作业中,CS可替代自身用量4～5倍的水玻璃,同时可提高白钨浮选回收率4个百分点以上。新型小分子抑制剂CS为解决经典钨矿浮选工艺中高水玻璃用量难题提供了新的解决方案。     

湖南某钨矿选矿试验研究

针对湖南某钨矿矿石性质, 阐述了有效分选白钨矿与含钙脉石矿物的石灰浮选法, 获得了对白钨矿相来说回收率达96.24%的白钨精矿。同时, 对“石灰法”浮选白钨矿的机理作了探讨。      

浮选白钨矿的捕收剂选择

近十年来所探明的钨矿资源,按地质储量计算,黑钨资源比重甚小,大部份是白钨矿。 白钨矿常伴有一系列与白钨可浮性相近的脉石如:方解石、磷灰石、石榴石、白云石等,它们往往与白钨矿同时进入泡沫产品,给精选作业带来困难。因此,为了使白钨矿与伴生的含钙脉石矿物有效地分离,必须人为地造成白钨矿与伴生含钙矿物的可浮性的差别,除了合理调浆和严格控制适宜的pH值外,选择捕收剂是白钨浮选关键之一。     

基于新型配位捕收剂的黑白钨常温精选新工艺

白钨矿与含钙脉石矿物浮选分离是白钨矿浮选的难题,在传统脂肪酸工艺体系中,白钨精选多依赖于传统的"彼得罗夫法"加温工艺。研究从含钙矿物晶体表面差异性出发,开发出对钨矿物具较强选择性的金属盐类配位捕收剂M-COMPLEX,和以其为捕收剂、盐化水玻璃为选择性抑制剂的黑白钨常温精选新工艺。采用该工艺处理柿竹园多金属选厂粗选车间WO3品位17.59%的黑白钨混合粗精矿,小型闭路试验获得钨精矿WO3品位63.18%、回收率94.96%的良好指标。该工艺在工业试验中具有很好的稳定性和重现性,可达到取代白钨加温精选工艺的目的。     

湖南某钨矿选矿试验研究

针对湖南某钨矿矿石性质，阐述了有效分选白钨矿与含钙脉石矿物的石头浮选法，获得了对白钨矿相来说回收率达９６．２４％的白钨精矿。同时，对“石灰法”浮选白钨矿的机理作了探讨。     

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。