摘要：Inefficient photo-carrier separation and sluggish photoreaction dynamics appreciably undermine the photocatalytic decontamination efficacy of ***,an S-scheme Mn_(0.5)Cd_(0.5)S/Bi_(2)MoO_(6)heterojunction with interfacial Mo-S chemical bond is designed as an efficient *** this integrated photosystem,Bi2MoO6 and Mn_(0.5)Cd_(0.5)S function as oxidation and reduction centers of Mn_(0.5)Cd_(0.5)S/Bi_(2)MoO_(6)microspheres,***,the unique charge transfer mechanism in the chemically bonded S-scheme heterojunction with Mo-S bond as atom-scale charge transport highway effectively inhibits the photocorrosion of Mn_(0.5)Cd_(0.5)S and the recombination of photo-generated electron-hole pairs,endowing Mn_(0.5)Cd_(0.5)S/Bi_(2)MoO_(6)photocatalyst with excellent photocatalytic decontamination performance and ***,integration of Mn_(0.5)Cd_(0.5)S nanocrystals into Bi2MoO6 improves hydrophilicity,conducive to the ***,compared with Mn_(0.5)Cd_(0.5)S and Bi2MoO6,the Mn_(0.5)Cd_(0.5)S/Bi_(2)MoO_(6)unveils much augmented photoactivity in tetracycline eradication,among which Mn_(0.5)Cd_(0.5)S/Bi_(2)MoO_(6)-2 possesses the highest activity with the rate constant up to 0.0323 min-1,prominently outperforming other *** research offers a chemical bonding engineering combining with S-scheme heterojunction strategy for constructing extraordinary photocatalysts for environmental purification.

摘要：In the survey of fishery resources,the sampling design will directly impact the accuracy of the estimation of the ***,it is necessary to optimize the sampling design to increase the quality of fishery *** distribution and abundance of fisheries resource estimated based on the bottom trawl survey data in the Changjiang River(Yangtze River)Estuary-Hangzhou Bay and its adjacent waters in 2007 were used to simulate the"true"*** the abundance index of Portunus trituberculatus were calculated and compared with its true index to evaluate the impacts of different sampling designs on the abundance *** sampling methods(including fixed-station sampling,simple random sampling,stratified fixed-station sampling,and stratified random sampling)were *** numbers of stations(9,16 and 24)were assumed for the scenarios of fixed-station sampling and simple random sampling without *** 16 stations were assumed for the scenarios with *** reaction distances(1.5 m,3 m and 5 m)of *** to the bottom line of trawl were also assumed to adapt to the movement ability of the *** for different ages,seasons and substrate *** speaking,compared with unstratified sampling design,the stratified sampling design resulted in more accurate abundance estimation of ***,and simple random sampling design is better than fixed-station sampling *** accuracy of the simulated results was improved with the increase of the station *** maximum relative estimation error(REE)was 163.43%and the minimum was 49.40%for the fixed-station sampling scenario with 9 stations,while 38.62%and 4.15%for 24 *** the increase of reaction distance,the relative absolute bias(RAB)and REE gradually ***-intensive area and the seasons with high density variances have significant impacts on simulation ***,it will be helpful if there are prior informa

摘要：This paper describes a dual-stroke acting hydraulic power take-off （PTO） system employed in the wave energy converter （WEC） with an inverse pendulum. The hydraulic PTO converts slow irregular reciprocating wave motions to relatively smooth, fast rotation of an electrical generator. The design of the hydraulic PTO system and its control are critical to maximize the generated power. A time domain simulation study and the laboratory experiment of the full-scale beach test are presented. The results of the simulation and laboratory experiments including their comparison at full-scale are also presented, which have validated the rationality of the design and the reliability of some key components of the prototype of the WEC with an inverse pendulum with the dual-stroke acting hydraulic PTO system.

摘要：Both reverse osmosis(RO) and nanofiltration(NF) membranes have been increasingly used for water purification and desalination. However, the salt rejection of NF membranes is quite different from that of RO membranes,which makes a significant distinction in their process designs. This work started from the performance investigation of a single NF membrane element and then focused on the process design of the NF system for surface water treatment. In experimental tests, it was found that the observed rejection of the NF element becomes nearly constant when the concentrate flow is large enough, while the membrane flux of the NF element is quite stable regardless of the water flow across the membrane surface. These findings can be used to instruct the process design of the NF system for surface water treatment. In process design, a two-stage arrangement is sufficient for the NF system to reach the highest water recovery, while the RO system requires a three-stage arrangement.

摘要：An optimal drainage tunnel location determination method for landslide prevention was proposed to solve the existing problems in drainage tunnel construction. Current applications of drainage tunnel systems in China were reviewed and the fimctions of drainage tunnel were categorized as catchment and interception. Numerical simulations were conducted. The results show that both catchment and interception tunnels have variation of the function in the simulation of monolayer model, which shows the reduction of permeability condition in lower layer. The function of catchment can be observed in the deep slope, while the function of interception is observed near groundwater source. By using the slope safety factor and discharge water amount as the objectives of optimal drainage tunnel location, and pore-water pressure in fixed node and section flux as the judgment for construction quality of adjacent drainage tunnel, the design principle of drainage tunnel was introduced. The K103 Landslide was illustrated as an example to determine the optimal drainage tunnel location. The measured drainage tunnel efficiency was evaluated and compared with that from the numerical analyses based on groundwater data. The results validate the present numerical study.

摘要：Groundwater lowering is one of the most important countermeasures to avoid the risk of rainfall-triggered ***,the long-term reliability of many drainage methods is often a matter of concern since the drains may easily get clogged.A new hydraulic-driven self-starting drainage method is presented in this *** the proposed Random Forest(RF)based robust design approach for the selfstarting drains,the datasets are generated using an automatically controlled numerical modeling *** deterministic analysis is carried out based on uncertain soil parameters and the specific designs selected using Uniform Design(UD).The ensemble of RF models is applied in the design process to improve computing *** requirements,design robustness,and cost efficiency are simultaneously considered utilizing multiobjective optimization.A straightforward and efficient framework that focuses on difficulties caused by an enormous design space is established for the robust design of the self-starting drains,and improved computation efficiency is *** effectiveness of the proposed approach is illustrated with a case study,the Qili landslide in zhejiang Province,China.

摘要：The highest similarity degree of static characteristics including both horizontal and vertical restoring force-displacement characteristics of total mooring system, as well as the tension-displacement characteristics of the representative single mooring line between the truncated and full depth system are obtained by annealing simulation algorithm for hybrid discrete variables （ASFHDV, in short）. A“baton” optimization approach is proposed by utilizing ASFHDV. After each baton of optimization, if a few dimensional variables reach the upper or lower limit, the boundary of certain dimensional variables shall be expanded. In consideration of the experimental requirements, the length of the upper mooring line should not be smaller than 8 m, and the diameter of the anchor chain on the bottom should be larger than 0.03 m. A 100000 t turret mooring FPSO in the water depth of 304 m, with the truncated water depth being 76 m, is taken as an example of equivalent water depth truncated mooring system optimal design and calculation, and is performed to obtain the conformation parameters of the truncated mooring system. The numerical results indicate that the present truncated mooring system design is successful and effective.

摘要：In this paper, we propose a new method to estimate the wave height of a specifi c return period based on the Hurst rule and a self-affi ne fractal formula. A detailed description of our proposed model is presented in this paper. We use the proposed model to analyze wave height data recorded along the coast of Chaolian Island from 1963 to 1989. The results show that the performance of our proposed model in estimating design wave heights is superior to traditional models.

摘要：目的:塑料排水板能够有效加速固结过程,因此被广泛应用于软土地基处理。然而,相关规范只给出了塑料排水板的间距和长度的取值范围,没有给出最优设计。本文旨在通过考虑土体参数不确定性、施工造价和设计要求三个方面,提出塑料排水板的最优设计。创新点:1.通过蒙特卡罗方法求解固结度的信噪比,得到不同设计的鲁棒性;2.讨论各种因素对最优设计的影响。方法:1.通过理论分析,推导出总固结度鲁棒性的计算公式;2.通过定义不同设计组合,讨论不同噪声参数,并运用蒙特卡罗模拟,得到满足要求的所有设计情况的鲁棒性;3.分析其他因素(如固结时间和固结度等)对最优设计的影响,并讨论参数变异性和相关性对结果的影响。结论:1.基于鲁棒性分析,得到了塑料排水板的最优设计方法。2.在低造价条件下,固结度、固结时间和塑料排水板布置形式对最优设计存在影响;当造价足够高时,该影响可以忽略。3.参数变异性和相关性对结果存在影响;如果低估了参数的变异性,会低估最优设计的造价。

摘要：目的:探索长时间停流情况下高扬程虹吸管中空气累积现象的发生发展及其对虹吸持续工作的危害,并给出应对该现象的工程预防措施。创新点:利用物理模型实验,结合理论解析推导,得到高扬程虹吸管内空气累积的原因及关键影响因素,突破高扬程虹吸排水在少雨地区的使用局限,给出其长期适用的工程设计条件,对其在实际边坡工程中的推广应用提供理论技术指导。方法:通过物理模型试验,揭示长期停流虹吸管内出现空气累积的必然性;利用理论公式推导,对不同因素的影响结果进行对比分析,得出影响空气累积的主要因素。结论:1.溶于水的空气因压力降低而析出、管端空气溶入扩散到虹吸管顶部及温度变化引起空气析出等现象是无法避免的;其中,原有空气的析出及温度变化引起的空气累积是主要因素;2.边坡虹吸排水设计时进水端口距控制水位至少应预留2.05 m的地下水位上升余量,或者保持出水口的高程比进水口高程低4.1 m来保证析出空气段处于下水管中。