低渗透砂岩石油渗流的微观模拟实验研究

采用天然低渗透砂岩微观模型，通过与实际地质状况较为相似条件下的油驱水实验，模拟石油在低渗透砂岩孔隙内的渗流，分析和探讨了低渗透砂岩孔隙介质中石油的微观渗流机理。研究结果表明，石油在低渗透砂岩中渗流路径曲折复杂，运移渗流模式有稳定式、指进式和优势式3种；石油在低渗透砂岩中渗流存在启动压力梯度，启动压力梯度与砂岩孔隙度关系复杂，而与砂岩渗透率有很好的相关性；石油的渗流速度与驱替压力呈很好的相关性，石油以相同速度在不同渗透率级别的砂岩内渗流时所需要的驱替压力随砂岩渗透率的增大而降低。     

国内外低压油气藏开发技术现状

针对低压油气藏的特点，介绍了国内外开发低压油气藏的一些技术现状，包括钻、完井地层保护技术，开发井网调整技术，注水（气）增压开发技术，酸化压裂等油层改造增产措施。国内外     

浅论女大学生学业压力及应对策略

女大学生作为大学生中令人瞩目的群体,面临着更多的压力和挑战,而学业压力是其中一个突出的问题.对于懂事好强的女大学生来说,学业问题关乎到自己的尊严、荣誉和前途.因此面对学业压力唯有勇敢接受挑战,学会调整自我,做一个快乐、阳光的现代知识女性.同时,也要整合社会、学校和家庭的资源,帮助女大学生缓解压力,健康成长.     

Sildenafil versus continuous positive airway pressure for erectile dysfunction in men with obstructive sleep apnea: a meta-analysis

Objective.?To evaluate the effectiveness of sildenafil versus continuous positive airway pressure (CPAP) for patients with erectile dysfunction (ED) and obstructive sleep apnea (OSA).

Methods.?This is a meta-analysis of a randomized controlled trial. The main outcome measures for effectiveness were the percentage of successful intercourse attempts, International Index of Erectile Function (IIEF) domain scores (erectile function, EF) and the satisfaction levels of the patients and their partners with the treatment for ED.

Results.?Two randomized controlled trials totaling 70 patients were included. Meta-analysis results are as follows: after 12 weeks of treatment, patients under sildenafil demonstrated a significant advantage over under CPAP in terms of the percentage of successful intercourse attempts [OR?=?3.24, 95% CI (2.37–4.43)], EF scores [WMD?=?3.57, 95%CI (1.68–5.45)], and the satisfaction levels of the patients and their partners with the treatment for ED [OR?=?3.56, 95% CI (1.27–9.98)].

Conclusion.?Current clinical studies might confirm that both therapeutic methods were safe and effective, but sildenafil was superior to CPAP in the treatment of ED in men with OSA. We conclude that new therapeutic agents or a combination of the two methods should be studied further.     

Inverse association between total testosterone concentrations,incident hypertension and blood pressure

Background.?Studies on the relationship between testosterone concentrations and blood pressure have yielded inconsistent results. Therefore, this study investigated the prospective association of total testosterone (TT) concentrations with risk of incident hypertension and blood pressure change in 1484 men aged 20–79 years.

Methods.?Data from the population-based Study of Health in Pomerania, Germany, were used. Serum TT concentrations, measured by chemiluminescent enzyme immunoassays, were categorised into age-specific quartiles. Generalised Estimating Equation (GEE) models, adjusted for age, waist circumference, physical activity, smoking and alcohol consumption were specified.

Results.?During a median follow-up time of 5.0 years, the prevalence of hypertension increased from 50.6% to 57.1%. TT concentrations were significantly lower in men with baseline and incident hypertension. Analyses revealed that men with baseline TT concentrations in the lowest quartile had an increased risk of incident hypertension (odds ratio (OR), 1.19 (95% CI, 1.10–1.28)) compared to men with higher TT concentrations. Furthermore, we found a significant inverse association of TT concentrations and blood pressure, showing that men with baseline TT concentrations in the lowest quartile showed the slightest change in systolic blood pressure (?6.01?mmHg), diastolic blood pressure (?2.11?mmHg) and pulse pressure (?3.98?mmHg). Sensitivity analyses in a subpopulation of men without antihypertensive medication confirmed these findings.

Conclusion.?These results show that low male TT concentrations are predictive of hypertension, suggesting TT as a potential biomarker of increased cardiovascular risk.     

数学学术期刊青年编辑心理压力的调适

数学学术期刊青年编辑承受着来自社会、工作及其他一些方面的压力，要想解除这些心理压力，可以从正确认识自我，摆脱不良情绪的干扰；不断学习，勇于改变自我；学会适时倾诉，合理宣泄；正确处理人际关系，营造和谐氛围等方面进行适当的心理调适，以培养良好的心理素质，保持积极健康的心态，更好地投入到工作中去。     

改制后的师范专科学校教师心理压力及调适

伴随教师教育改革,升格后的师范专科学校教师由于对学校未来预期水平的不确定、教师个体对未来教育的应对能力有限、教师对现有教学工作不投入,缺乏自我效能感等原因,产生强大的心理压力。据此,教师自身和学校应积极应对,教师要明确认识,积极适应;立足教学,做研究型教师,增强自身竞争力;学校要创设条件,鼓励教师在职进修,增强学校竞争力;教育部门要加强对师范专科学校教育科研的支持、指导。     

"沉默的螺旋"在传统大众传播环境和网络传播环境中表现方式的差异

“沉默的螺旋”是一种传统大众传播的强效果论。结合CMC(以电脑为媒介的传播)与FTF(面对面的传播)有关群体压力方面的研究成果,认为网络受众从众心理的动因继续存在,从众现象依旧普遍,因此,产生“沉默的螺旋”机制的基本条件在网络空间中仍然存在,并分析了“沉默的螺旋”在传统大众传播环境和网络传播环境中表现方式的差异。     

从国际游资动向看人民币的升值可能

2002年以来,日本、美国等国家纷纷要求人民币升值,受这种升值预期的影响,热赌人民币升值的国际游资几进几出中国内地及周边金融市场,人民币升值压力日益加大。从人民币升值的利弊分析,在短期内中国仍以保持稳定的汇率为佳。     

成人重返课堂的教育实践探析

教育制度和个体教育实践总是一个相互模塑的过程,成年人教育实践为成年教育制度的建立和完善提供现实基础和根据,而成人教育制度对成人教育起到促进或制约作用。立足于农村中小学教师在成年期攻读研究生学位的继续教育实践,从微观的角度探讨其在学术科研、生活状况、情感世界和职业期望等方面表现出来的苦恼、不安、焦虑、困惑、迷惘、沮丧、无奈等不适应问题,为成年教育理论的发展和成年教育制度的完善提供第一手经验资料。