PREDICTION OF FATIGUE LIVES OF RC BEAMS STRENGTHENED WITH CFL UNDER RANDOM LOADING

The investigation on fatigue lives of reinforced concrete （RC） structures strength- ened with fiber laminate under random loading is important for the repairing or the strengthening of bridges and the safety of the traffic. In this paper, two methods are developed for predicting the fatigue lives of RC structures strengthened with carbon fiber [aminate （CFL） under random loading based on a residual life and a residual strength model. To discuss the efficiency of the model, 12 RC beams strengthened with CFL are tested under random loading by the MTS810 testing system. The predicted residual strength approximately agrees with test results.     

YSI 6600型水质多参数监测仪在太湖藻类监测中的应用

采用YSI 6600型水质多参数监测仪对太湖藻类密度进行监测,发现蓝藻在水中呈垂直分布。选取不同水深对太湖藻类密度进行监测,结果表明,水深0.5m处的藻类密度监测数据较能反映水体中藻类密度的实际情况,以此制定了太湖蓝藻水华状况评价及水源地藻类应急处置级别推荐标准(试行)。最后提出了YSI 6600型水质多参数监测仪在监测中存在的优点与不足。     

青藏铁路那曲物流中心建设中水土流失预测

青藏铁路那曲物流中心水土保持方案采用类比法进行预测,结果表明那曲物流中心工程建设施工过程中破坏地表植被707.77hm2,损毁水土保持设施500.1hm2,弃土弃渣194.97万m3和可能产生的水土流失量2.32万t,并分析了水土流失的危害。根据预测结果表明,本项目的重点监测时段为施工建设期,重点防治工程为主体工程和取弃土场。     

浅谈工业厂房照明设计

厂房的照明设计直接关系到生产效率、产品质量及生产安全。本文从照明方式、照度标准、照明光源及灯具选择等方面着手,从节能的角度阐述了厂房照明设计。     

Local changes in snow depth dominate the evolving pattern of elevation-dependent warming on the Tibetan Plateau

Elevation-dependent warming (EDW),whereby warming rates are stratified by elevation,may increase the threat to the life-supporting solid water reservoir on the ...     

Tuning Aggregation Behavior of Polymer Donor via Molecular-Weight Control for Achieving 17.1％ Efficiency Inverted Polymer Solar Cells

Main observation and conclusion Recently,the polymer solar cells (PSCs) based on the PM6 and small molecular acceptor (SMA) Y6 have attracted considerable atten...     

Pillar[5]arene based conjugated macrocycle polymers with unique photocatalytic selectivity

The development of heterogeneous catalysts with substrate shape, size or electronic constitution selectivity is a huge challenge in photocatalysis. Reported herein is a host-guest interaction strategy to endow photocatalysts with special selectivity. By adjusting the precursors, conjugated macrocycle polymers (CMPs) with pillar[5]arene struts (CMP-1 and CMP-2) and a corresponding non-pillar[5]arene-contained conjugated organic polymer (COP-1) were prepared and the photocatalytic activities toward sulfide derivatives were investigated. The sulfides showed similar conversions when COP-1 was used as a photocatalyst, but exhibited significant differences when it turned to the CMPs. Remarkably, the conversion yield of S-1 achieved near 18 folds over the one of S-2 when CMP-2 was used as a catalyst. Mechanism studies confirmed that the “host-guest” effect of pillar[5]arene struts in CMPs was the main cause of the difference. The present work establishes CMPs as novel heterogeneous photocatalysts with substrate selectivity, and such a method will inspire the researchers concerning preparation of heterogeneous catalysts with excellent selectivity.     

Surface tension of supercooled graphene oxide nanofluids measured with acoustic levitation

Journal of Thermal Analysis and Calorimetry - The surface tensions of graphene oxide nanofluids of five mass concentrations were measured by the oscillation droplet method in an acoustic levitator....     

Spreading of Oil Droplets Containing Surfactants and Pesticides on Water Surface Based on the Marangoni Effect

Oil droplets containing surfactants and pesticides are expected to spread on a water surface, under the Marangoni effect, depending on the surfactant. Pesticides are transported into water through this phenomenon. A high-speed video camera was used to measure the movement of Marangoni ridges. Gas chromatography with an electron capture detector was used to analyze the concentration of the pesticide in water at different times. Oil droplets containing the surfactant and pesticide spread quickly on the water surface by Marangoni flow, forming an oil film and promoting emulsification of the oil–water interface, which enabled even transport of the pesticide into water, where it was then absorbed by weeds. Surfactants can decrease the surface tension of the water subphase after deposition, thereby enhancing the Marangoni effect in pesticide-containing oil droplets. The time and labor required for applying pesticides in rice fields can be greatly reduced by using the Marangoni effect to transport pesticides to the target.     

Amorphous Manganese–Cobalt Nanosheets as Efficient Catalysts for Hydrogen Evolution Reaction (HER)

Catalysis Surveys from Asia - A facile and efficient electrocatalyst for hydrogen evolution reaction (HER) to produce hydrogen is very important for future energy. In this paper, amorphous...