中学学困生的英语素质教育

英语素质教育是对学生进行社会文化素质、心理素质和生理素质等方面的能力和品质培养过程中的教育,实施英语素质教育是社会进步和时代发展的需要,是改革开放培养人才的需要.而基础教育阶段的素质教育尤为重要,其中学困生的素质教育应该是每一个教育工作者所关心和思考的问题.教师在教学中要热爱并经常鼓励学困生,从提高他们的学习兴趣入手,采取行之有效的教学方法,从思想素质、文化素质和心理素质等方面来使他们有所提高.     

和田绿洲水循环要素变化特征

应用距平及差积曲线分析和坎德尔(Kendall)秩次相关检验表明，和田绿洲气温存在着递增趋势，处于变暖期；受气温影响，蒸发能力、空气湿度也呈增加趋势，但不显著；降水年际变化较大，年内分配趋于集中，有降水异常现象出现；由于人类活动，河流径流减少十分显著。     

高寒地区某RCC重力坝保温措施及效果分析

某RCC重力坝地处高寒地区,又属欧亚大陆腹地,冬季寒冷且历时较长,曾观测到的极端最低气温为-49.8 ℃,多年平均气温为2.7 ℃.在本地区修建RCC重力坝,温控设计是关系到大坝建设成败的关键,温度控制必须解决"冷"对大坝温度应力的影响,防止大坝表面裂缝及深层裂缝的出现.现阐述了此RCC重力坝采取的保温温控措施,并根据施工现场实际监测成果对保温措施的效果进行了分析评价,以资类似工程借鉴.     

高坝泄洪挑流消能工优化研究与应用

挑流消能工是高坝建设中应用最广的消能形式,不同工程应针对工程自身的特点进行优化研究与选择.选取长江科学院主要研究的3种不同坝型的已建工程泄水建筑物为代表,对隔河岩重力拱坝泄洪水流向心集中问题、水布垭面板堆石坝非对称狭窄河谷消能区冲刷和淤积问题,以及构皮滩双曲拱坝坝身泄洪功率最大的水垫塘消能防冲问题进行了论述.分别提出了...     

HYDRAULIC RESEARCH OF AERATORS ON TUNNEL SPILLWAYS

The selection of the configuration and size of an aerator was of importance for a tunnel spillway under the conditions of high speed flows. Experimental investigations were conducted on the effects of entrained air on the tunnel spillway in the Goupitan Project, based on the criterion of gravity similarity and the condition of aerated flow velocity of over 6 m/s, with physical models. The configurations of the aerators were presented of a larger bottom air concentration, to protect the tunnel spillway from cavitation as well as to see no water fills in the grooves.     

高桥水电站取水口防沙设计

高桥水电站取水口防沙设计,在原束水墙结合冲沙槽设计的基础上,进行了水工、泥沙模型试验。根据模型试验成果,先后进行了沉沙池方案、潜堰方案、潜堰＋丁坝方案、圆弧形挡墙方案等的综合比较,最终选定了圆弧形挡墙方案,基本上解决了水电站取水口“门前清”和粗颗粒进入水电站取水口的问题,大坝泄洪冲沙底孔排沙效果也较好。     

互联网金融平台审计监督的博弈仿真分析

为了防范互联网金融风险,发挥金融审计在互联网金融平台运营中风险治理的职能,基于有限理性假设,借鉴演化博弈理论探讨审计机构与互联网金融平台双方在监督与运营中的决策行为,引入计算实验方法"情景—应对"思想,对演化博弈结果进行动态模拟仿真。实验结果表明,在目前我国互联网金融生态下,互联网金融平台违规运营是一种稳定均衡策略,而通过调整审计机构行为收益、损失与成本参数,能提升其严格审计监督的策略选择概率,进而提出应完善审计监督奖惩机制、优化审计监督成本、建立长效的互联网金融审计监督体系。     

Effects of leachate infiltration and desiccation cracks on hydraulic conductivity of compacted clay

Both cracks in clay liner and the complex composition of landfill leachate might have effects on the hydraulic conductivity of a compacted clay liner. In this study, the hydraulic conductivities of natural clay and bentonite-modified clay with and without desiccation cracks were measured, respectively, using three types of liquids as permeating liquid: 2 500 mg/L acetic acid solution, 0.5 mol/L Ca Cl2 solution, and tap water. When tap water was adopted as the permeating liquid, desiccation cracks resulted in increases in the average value of hydraulic conductivity: a 25-fold increase for the natural clay and a 5.7-fold increase for the bentonite-modified clay. It was also found out that the strong selfhealing capability of bentonite helped to reduce the adverse impact of cracks on hydraulic performance. In contrast to tap water, simulated leachates(acetic acid and Ca Cl2solutions) show no adverse effect on the hydraulic conductivities of natural and bentonite-modified clays. It is concluded that desiccation cracks and bentonite have more significant effects on hydraulic performance than simulated leachates.     

我国居民杠杆率现状及影响因素研究

近年来,我国居民部门杠杆率的快速上升引起社会各界关注。本文使用货币信贷和城镇储户调查数据,对我国居民部门杠杆率和偿债能力现状进行了分析,并运用各省住户贷款数据计算各省的居民杠杆率,使用面板数据模型对居民杠杆率上升的原因进行了实证分析。结果表明,房价的快速上涨和住房销售的增长都对居民部门杠杆率的上升有显著正向影响,其中房价上涨的影响程度更大。此外,金融发展水平和老年人抚养比对居民杠杆率有正向影响,少年人抚养比对居民杠杆率有负向影响。     

Prediction of sediment resuspension in Lake Taihu using support vector regression considering cumulative effect of wind speed

Sediment resuspension is critical to ecosystem function in shallow lakes. Turbidity is one of the most commonly used indicators of sediment resuspension and has proven to be strongly related with wind. However, it is still difficult to predict sediment resuspension due to its complicated mechanisms. In this study, a support vector regression (SVR) model considering the cumulative effect of wind speed was trained to predict sediment resuspension based on intensified field observations at two sites in Lake Taihu. The accuracy of the SVR model was evaluated, and the initial turbidity was introduced to the model to illustrate its contribution to sediment resuspension. The critical wind speed was also evaluated based on this model. The results indicate that the SVR model considering the cumulative effect of wind speed can increase the accuracy of prediction in comparison with traditional fitting methods. The root-mean-square error (RMSE) of the predicted turbidity dropped to 11.36 NTU at one site and 16.78 NTU at the other, and the maximal information coefficient ($c_{\mathrm{i}\mathrm{m}\mathrm{a}\mathrm{x}}$) for the relationship between wind speed and turbidity increased to 0.56 for both observation sites. The introduction of initial turbidity significantly improved the performance of the SVR model, with an RMSE value lower than 8.00 NTU and a $c_{\mathrm{i}\mathrm{m}\mathrm{a}\mathrm{x}}$ value higher than 0.95. Analysis of the critical wind speed using the SVR model shows that the critical wind speed generally increased with the rise of initial turbidity. The critical wind speeds at initial turbidities of 30, 40, 50, and 60 NTU were 5, 6, 7, and 7 m/s, respectively.