英语模糊语之语用功能初探

英语模糊语在英语使用中占相当大的比重,其语用功能颇多。本文选用会语和书面语中的实例,运用语用学原理,注重语用效果,对英语模糊语言的使用进行分析归纳,初步探索出八大语用功能     

矿井水害防治关键技术及防治水专业人才培养方案探讨

目前,我国煤矿防治水关键技术亟待突破,防治水专业人才匮乏。本文首先简要总结了我国矿井水害防治的现状,回顾了我国矿井水防治专业人才培养的历史,然后指出了防治水技术应该优先发展的关键技术和方向,提出了矿井防治水专业人才培养的课程体系,并给出了研究基地建设和高层次专业人才培养的有关建议。     

Experimental Study on Heat Transfer and Pressure Drop of Micro-Sized Tube Heat Exchanger简

A micro-sized tube heat exchanger(MTHE) was fabricated, and its performance in heat transfer and pressure drop was experimentally studied. The single-phase forced convection heat transfer correlation on the sides of the MTHE tubes was proposed and compared with previous experimental data in the Reynolds number range of 500—1 800. The average deviation of the correlation in calculating the Nusselt number was about 6.59%. The entrance effect in the thermal entrance region was discussed. In the same range of Reynolds number, the pressure drop and friction coefficient were found to be considerably higher than those predicted by the conventional correlations. The product of friction factor and Reynolds number was also a constant, but much higher than the conventional.     

T91钢退火热处理工艺的优化

以现有T91钢热处理工艺为依据,结合T91钢管开裂原因,对T91钢分别在770℃,790℃,810℃,830℃进行退火,通过拉伸试验、硬度试验、金相试验并结合钢厂的实际得出,T91钢的退火温度为820℃～830℃,速度为0.13m/min,从进料到出料时间约为120min,管材的成材率提高12.8%.     

粤港澳大湾区城市热岛空间格局及影响因子多元建模

探究影响城市热岛空间格局的因子,及科学分析各因子的作用机制,对揭示城市热岛效应的机理有着重要意义。本文以粤港澳大湾区为研究区,综合利用数据空间化表达、空间叠置、地理探测器等方法,对影响城市热岛空间格局的因子开展研究,并构建地表温度与影响因子间的多元关系模型。结果表明,粤港澳大湾区的城市热岛强度等级呈现中间高四周低的空间分布格局,并在珠江入海口两岸形成半环状城市热岛带。本文选取的5种影响因子对城市热岛的空间格局皆具有较高的解释力,平均解释力排序为：单元人口密度（0.668）>建设用地面积占比（0.577）>单元路网密度（0.573）>植被面积占比（0.538）>水体面积占比（0.428）。所构建的多元关系模型,能较准确地反映城市热岛区域地表温度的分布状况,所拟合的地表温度结果与实际地表温度平均值的误差为0.34℃。     

西安市地表温度反演及城市热岛强度定量化研究

本文基于单窗算法,选取1992年、2000年、2006年、2013年四期LandsatTM/ETM影像及西安市、西安市周边各气象站点的观测资料作为研究数据,对西安市地表温度反演及城市热岛强度进行定量化研究,结果表明:1西安市二环与三环之间区域的地表温度升高较快,城市中心地表温度的变化程度低于二环与三环之间的区域,这与西安市城市规划布局和实际情况相一致,热岛区的面积年平均增加速率为0.83%;21992-2013年西安城区气温平均升高约1.3℃左右,西安郊区气温平均升高约0.1℃左右,说明热岛效应对西安市的整体气温的升高贡献率比较大。就热岛强度总体而言,西安市热岛强度仍呈现上升趋势,期间1996-2001年西安市城市热岛强度呈下降趋势,2008-2011年西安市城市热岛强度呈持续上升趋势,2002-2007年西安市城市热岛强度有增有减,变化规律不明显;3城市热岛比较高的区域逐渐向周围城市扩展,城市中心温度的变化速率比周围略低;4中温、高温、次高温的热岛面积百分比是先增大后减少,次低温及低温的热岛面积百分比是先减少后增大。     

企业间行为、社会责任与合作创新绩效

将社会责任引入合作创新领域,探索企业间行为,包括专用性投资、合作研发及组织间学习3个因素对企业合作创新绩效的影响以及社会责任的调节作用。以我国企业为样本进行问卷调查,以企业规模、企业年限及企业合作经验作为控制变量,构建理论模型并进行检验。研究结果表明:社会责任显著增加了专用性投资对于合作创新绩效的正向作用,但专用性投资对合作创新绩效的积极作用并不显著;合作研发及组织间学习会显著促进合作创新绩效,并且社会责任能够增加两者对合作创新绩效的正向作用。     

Early detection of prostate cancer: evaluating the diagnostic performance of prostate specific antigen by comparing with histological technique among africans

This study was conducted to investigate the diagnostic performance characteristics of prostate specific antigen (PSA) by comparing serum PSA value with histological findings in patients suspevted of having prostate cancer in Aminu Kano Teaching Hospital. Nigeria. Clinical and Laboratory records were examined and collated for serum PSA values, together with histological findings of biopsy specimen, clinical diagnosis, age of patients, and mode of presentation. The serum PSA values were determined by ELECSYS 1010 autoanalysers Roche, Germany based on electrochemiluminescence immunoassay technique. The results show that serum PSA values increase with age in the assymptomatic non-cancer patients who came for medical check up but were within normal limit. In prostatic disease conditions PSA values were raised in benign prostatic hyperplasia 35.957± 4.0315ng/ml, in undifferentiated carcinoma 56.22±4.295ng/ml and adenocarcinoma >100ng/ml as compared to the normal range (0–4ng/ml). These cases were confirmed by histological diagnosis. It is concluded that PSA evaluations is a sensitive marker for prostate cancer but because of various other conditions that affect serum PSA concentration, other methods of investigations such as Digital Rectal examination, Trans Urethral Ultra-Sonography and histological examination should be combined to confirm diagnosis. Prognosis of patients will be better if early diagnosis is made.     

混凝土夹心泡沫水泥的制作及其性能研究

研究了普通混凝土夹心泡沫水泥的制作方法,测定了泡沫混凝土与普通混凝土的结合力及其抗冷热冲击的能力,并提出了提高其结合力的方法,为普通混凝土、泡沫混凝土复合保温墙体的生产提供有益的参考.     

高温胁迫对黄瓜生理、生化过程的影响

本文综述和讨论了高温胁迫对黄瓜生理、生化过程影响的研究进展、存在的问题和研究的方向。