现场使用侵入式水口的探讨

结合现场以及试验的结果,比较和分析了现场使用的各种侵入式水口的材质要求以及各种水口材质使用特点,以及侵入式水口的各种工艺参数的要求以及对工艺生产的影响,详细论述了侵入式水口结瘤形成的机理和原因。     

矿区水文及工程地质勘察在滑坡灾害治理工程中的应用探究

在现阶段社会的发展过程中,矿区水文以及工程地质勘察作为针对当地矿区水文特征以及地质特点进行勘察的技术手段,可以及时地对当地的矿区水文特征以及地质条件进行研究,提前发现可能存在的安全隐患并进行解决。而现阶段工业化的发展过程中,滑坡灾害已经严重影响了一些作业的进行,如矿产资源开采以及建设工程施工,就需要相关人员加强对滑坡灾害的重视并进行必要的治理。矿区水文以及工程地质勘察作为针对当地矿区水文以及地质进行检查的技术,可以应用到滑坡的治理中。本文从矿区水文以及工程地质勘察入手,浅谈其在滑坡灾害治理中的应用。     

遥感技术在地质灾害监测中的应用刍议

遥感技术凭借其信息量充足、具有一定的宏观性、实效性好等优势,逐渐发展成为在环境宏观检测以及地质灾害方面不可或缺的技术,能够有效对滑坡、地面沉降、泥石流以及土地沙漠化等地质灾害情况进行有效预警。监管以及评估等,在一些防灾治灾以及大型项目环境灾害的监测方面有着重要的意义。     

生物冶金技术应用与发展现状

本文简要介绍了生物冶金技术中微生物的种类、作用方式以及该技术在国内外的发展以及工业应用现状,并指出了该技术的发展趋势以及工业化过程中需要解决的问题。     

加强地质勘查与找矿技术创新的途径研究

随着整个社会经济以及科技两方面的快速发展,而与此同时,所带来的是能源需求的不断扩大。但针对目前的我国地质勘探技术进行分析,可以发现勘查技术整体还比较落后,与目前的社会发展以及需要无法进行匹配。而当今的经济市场整体发展中还受着能源问题的限制。在这样的形势以及背景下,通过对于我国地质勘查以及找矿技术的不断提升就显得意义非凡。本篇文章主要以地质勘查以及找矿技术作为主要的研究对象,通过对于基本原则等问题进行深入分析的基础上,进一步提出加强勘查以及找矿技术的创新途径建议。     

平面应变压缩金属流变规律及影响因素分析

 平面应变热模拟技术是塑性加工领域广泛应用的一种实验室模拟技术,现被广泛应用于测量金属的变形抗力以及金属的流动状态,是热轧过程模拟的最好的方法。为了全面研究平面应变技术,采用理论分析、数值模拟以及物理模拟的方法,系统分析了刚端、摩擦、试样尺寸以及对中性对平面应变过程中的应力状态以及金属流动的影响。研究结果显示各因素对金属流动以及实验结果的准确性有较大影响。     

连续挤压铜排气泡产生原因分析及工艺措施

针对铜排在连续挤压工艺过程中以及后续工序产生的气泡缺陷问题,在考虑整个工艺流程的基础上,从上引法铸造工艺的原材料、回炉废料以及设备工艺、车间传送工艺、连续挤压工艺以及工装模具等方面分析可能促使气泡缺陷产生的原因,从生产实际出发提出了缺陷消除的设计以及工艺措施。     

从含有V、Mo和Ni的废弃物中回收有价值金属的方法

提供可以从含有V、Mo以及Ni的废弃物中稳定、高成品率地回收Fe—Mo—Ni系合金以及Fe—V系合金的方法。本发明从含有V、Mo以及Ni的废弃物中回收有价值金属的方法包括：用Fe还原含有V、Mo以及Ni的废弃物,生成含V炉渣和Fe—Mo—Ni系合金,同时将上述含有V、Mo以及Ni的废弃物中的P成分残留在Fe—Mo—Ni系合金中的工序;     

板坯连铸机中扇形段更换系统的选型与应用

根据生产实践与设计以及连铸车间的现场的使用情况,并从设备维护、维修以及经济性能的角度介绍几种常见的板坯连铸机扇形段更换吊装系统,以及选型和设计需要注意的关键事项。     

海外冶金项目采购与物流管理探究

文章首先分析了海外冶金项目管理以及管理类型,总结为采购管理与物流管理两方面。在此基础上重点论述海外引进项目开展采购以及物流管理中建立基础框架的具体措施,以及在运营管理体系中需要注意的重点内容。帮助全面提升海外业金项目控制管理严谨性,为项目管理以及成本控制任务开展提供参照。     

The gradual threshold model of ambivalence: relating the positive and negative bases of attitudes to subjective ambivalence

Eighty subjects viewed and visually imagined upright or rotated alphanumeric characters and later judged whether test characters were previously seen or imagined (reality monitoring). Identification and test characters were presented verbally or visually. When characters were identified and tested verbally, source confusions (misjudging a seen character as "imagined" and vice-versa) were infrequent and were comparable for rotated and upright characters. When characters were identified and tested visually, source confusions were more frequent and were influenced by character rotation. Memories for imagined characters were especially susceptible to source confusion. Also source confusions for seen characters increased when characters were rotated. These results are consistent with the proposal that increasing sensory similarity between perceived and imagined items increases source confusion and that perceived rotation generates cognitive operations similar to those generated when the subject imagines a character rotated.     

Sulfur distribution in bacteriorhodopsin from multiple wavelength anomalous diffraction near the sulfur K-edge with synchrotron x-ray radiation

Estimates of variance components for test day records in an animal model that considered multiple traits over multiple lactations were calculated using REML methodology. Test day records were classified into 11 periods within first and later lactations. Missing ancestors in the relationship matrix were classified in genetic groups. Data were collected from Costa Rican dairy farms. Estimates of components for total and additive genetic variance were clearly heterogeneous during the lactation. Heritabilities for traits in later parities were slightly higher than those for traits in first parity. Heritabilities were highest for records of midlactation. Phenotypic and genetic correlations for adjacent test days were close to 1. Phenotypic correlations were lower than genetic correlations. Heterogeneity of variances during the lactation suggests the adequacy of the multiple-trait test day model to describe milk yield during the lactation. When missing ancestors were allocated to a single base population instead of genetic groups, the estimates of residual variance were lower, and the estimates of genetic variance and genetic correlations were higher. When standardized records were used instead of actual test day records, the estimates of residual and total variance were lower, and the estimates of genetic variance were higher. Consequently, estimates of heritability and genetic correlations were also higher. Use of standardized data obtained by interpolation procedures is not advised for estimation of genetic variance components in a test day model.     

Within-child associations between family income and externalizing and internalizing problems.

Within-child associations between family income and child externalizing and internalizing problems were examined using longitudinal data from the NICHD Study of Early Child Care and Youth Development (2004a, 2004b; N = 1,132). Variations in income effects were estimated as a function of whether families were poor, whether mothers were partnered, and the number of hours mothers and their partners were employed. On average, children had fewer externalizing problems during times when their families' incomes were relatively high than during times when their families' incomes were relatively low; the estimated benefits of increased income were greatest for children who were chronically poor. For both externalizing and internalizing problems, income was most strongly associated with problems when chronically poor children's mothers were partnered and employed. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Latchkey children and susceptibility to peer pressure: An ecological analysis.

Data on adolescents' after-school experiences and their susceptibility to peer pressure were derived from surveys administered to a heterogeneous sample of 865 adolescents in Grades 5–9. Consistent with the findings of previous studies, the results show that Ss who reported home after school were not significantly different from those who were supervised by their parents at home during after-school hours. However, when a 2nd sample of latchkey children (n?=?594) was studied to include greater variation in after-school experiences, Ss who were more removed from adult supervision were found to be more susceptible to peer pressure to engage in antisocial activity. Ss who were home alone were less susceptible to peer pressure than are those who were at a friend's house after school, and those who were at a friend's house, in turn, were less susceptible than were those who describe themselves as "hanging out." Moreover, latchkey Ss whose parents knew their whereabouts and those who had been raised authoritatively were less susceptible to peer influence than were their peers, even if their afternoons were spent in contexts in which adult supervision was lax and susceptibility to peer pressure was generally high. (17 ref) (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Taking care of the elderly: the unmentioned abuses

A total of 10,427 diarrhoeal stool specimens were cultured for Vibrio cholerae between 1992 and 1997. The isolation rates were 2%, 2.6%, 6.7%, 7.08%, 0.9% and 2.6% in the years from 1992 to 1997 respectively. Till 1992, Vibrio cholerae 01 ogawa was the predominant strain. In 1993, 81.3% of the isolates were of 0139 Bengal strain and the rest were V. cholerae 01. From 1994 to 1997, V. cholerae 01 ogawa was the predominant strain and there were no isolation of 0139 strain. The predominant phage type in 1992 and 1993 were T2 and T27 thereafter. Most Vibrio cholerae strains were sensitive to tetracycline, gentamycin, netromycin, norfloxacin and furazolidine. Strains were resistant to cotrimaxozole till 1996, but were 100% sensitive in 1997. Strains were sensitive to chloramphenicol till 1993 but acquired resistance thereafter.     

A clinical study of Thai patients with spondyloarthropathy

Eighty-eight Thai patients (61 males and 27 females) with spondyloarthropathy (SpA) were studied. Their mean age and mean duration of the disease were 25.97 and 3.34 years respectively. In 16 cases the disease first appeared before the age of 16 or had juvenile onset. Eleven cases were ankylosing spondylitis (AS), 9 were juvenile AS (JAS), 20 were Reiter's syndrome (RS), 4 were juvenile RS, 14 were psoriatic arthritis (PsA), 27 were undifferentiated SpA (uSpA), and 3 were juvenile uSpA. Peripheral arthritis, especially oligoarthritis of the lower extremity joints, was the most common form of arthritis in all groups, except for PsA, where polyarthritis was common. Back pain and bilateral sacroiliitis were commonly seen in JAS and AS. Enthesopathy was not uncommon. Extra-articular manifestations were more common in RS patients. Acute inflammatory eye diseases were seen in 45 per cent of AS and 66 per cent of RS cases. In general, the clinical features of Thai patients with SpA were similar to those reported in other countries in Asia and the west.     

Hormone replacement and menopausal symptoms following hysterectomy

Hormone replacement therapy (HRT) is recommended for most women who experience surgical menopause following hysterectomy/oophorectomy for noncancerous conditions; it is also commonly prescribed for postmenopausal women. Beginning in 1992, 1,299 women undergoing hysterectomy in 28 hospitals throughout Maryland were interviewed prior to hysterectomy and were subsequently followed over a 2-year period. Interviews included questions about HRT use and symptoms associated with menopause. The majority of the women (66 percent) were white, 55 percent had a high school education or better, 49 percent were obese (body mass index > or =27.3), and 11 percent were postmenopausal. Over 40 percent of premenopausal women underwent bilateral oophorectomy. At 3 months posthysterectomy, 89 percent of these women were on HRT; this figure dropped to 85 percent at 24 months. Among postmenopausal women, 50 percent were on HRT both at 3 months and at 24 months posthysterectomy. Among premenopausal women who had unilateral oophorectomy, 21 percent were on HRT at 3 months, increasing to 35 percent at 24 months. Among premenopausal women who had no ovaries removed, 5 percent were on HRT at 3 months, increasing to 13 percent at 24 months. There were few within-group differences between HRT users and nonusers, except that among postmenopausal women, HRT users were younger and more likely to be white and had higher income and educational levels. Women who were postmenopausal or who underwent bilateral oophorectomy were less likely to have hot flashes if they were on HRT, but women with 0-1 ovary removed who were on HRT were more likely to have hot flashes than those not on HRT. Black women were significantly more likely to experience hot flashes than were white women, independent of HRT status and weight. Obese women were on HRT at approximately the same rates as nonobese women but were significantly more likely to have hot flashes, even when analyses controlled for HRT and race.     

Optic neuritis caused by contact with lead compounds

The reliability and validity of the Uzgiris and Hunt (1975) scales of sensorimotor development were examined with severely and profoundly retarded children. The subjects were 63 severely or profoundly retarded children between 42 and 126 months of age. Thirty of the subjects were living in residential facilities, and 33 were living at home and attending day schools. All of the subjects were assessed on all six scales of the Uzgiris and Hunt instrument. Interexaminer and test-retest reliabilities were computed. Scalogram analyses were also computed for all but the Schemes scale. The findings were that the scales were reliable and, as theorized by Piaget, ordinal with the present sample. These findings were interpreted as indicating that these scales could be used reliably and validly with severely and profoundly retarded children. This was discussed in terms of the present and potential uses of these scales.     

Mammographic screening of the health district 38, hospital of Gardone Val Trompia (Brescia - Lombardy). Results of the first 2 rounds

The authors report the results of the first two rounds of a mammographic screening program by the Health District of Gardone Val Trompia (Brescia) including women 50 to 69 years old. 9,650 women were invited for round one and 6,415 (66.5%) attended; 9,656 were invited for round two and 6,552 (67.8%) attended. Fifty-four cancers were found in round one (detection rate: 8.4/1000): 11.1% of them were in situ carcinomas, 63% were T1 and 24.1% were T2 lesions, or higher. In round two, 32 lesions were detected (detection rate: 4.9/1000): 15.6% of them were in situ carcinomas, 78.1% were T1 and 3.2% were T2 lesions. In the positive cases axillary lymph nodes involvement was observed in 24.1% of cases in round one and was unknown in 27.8%, but the figures decreased to 6.2% and 9.4%, respectively, in round two. Effectiveness indicators were always observed.     

Effects of ionizing radiation on incisor development of the prenatal mouse

The effects of 100 rad of X-irradiation of incisor development in CD1 mice were studied. 24 pregnant mice were irradiated on the 12th day post coitum and sacrificed from the 14th through the 20th gestational days. The 191 irradiated fetuses were smaller than those not irradiated, their crania and necks were malformed and their lower extremities were poorly developed. The developing incisors of the irradiated animals were retarded, the pulpal vessels were enlarged and the vessels walls did not maintain their structural integrity. The cells of the future pulp were necrotic, and the basement membranes appeared hyalinized. Ameloblasts and odontoblasts were abnormal in morphology and the formation of dental hard tissue was inhibited in places. Complete absence of incisor tooth germ was noted in three of the fetuses.