池体结构刚柔结合防水施工

针对池体结构刚柔结合防水施工展开论述。

污水处理厂池体结构防渗抗裂施工及质量控制措施

污水处理厂工程施工包括多个工序及环节,池体结构是关键工序之一,其防渗抗裂性能是否达标,直接影响污水处理质量及污水厂正常运营。因此,一定要做好池体结构施工及质量控制工作,保证其具有良好的防渗抗裂性能,投入使用后能高效开展各项污水处理工作。

监理对大面积薄壁型钢筋混凝土池体结构质量控制

以项目为例,对大面积薄壁型钢筋混凝土池体结构质量控制进行分析,以期提高污水处理系统中薄壁型钢筋混凝土池体结构质量控制水平。

农村户用沼气池池体结构故障修补技术

沼气池在使用过程中易出现漏水、漏气现象，即“病态池”。要及时进行修补，确保其正常使用。

超大型复杂地下地埋式污水厂工程结构设计研究

超大型复杂地下地埋式污水厂工程结构设计建筑结构具有综合性污水处理的功能,借助完善的基础设施、专业的污水处理设备,为人们提供高质量、便捷服务。随着城市建设速度的增加,城市居民生活品质显著提高,对环境保护日益重视。地埋式污水厂可以有效处理污水问题,降低环境污染,有利于环境保护。为了提高超大型复杂地埋式污水厂工程的建筑质量,综合工程实例与经验,对地埋式污水厂的建筑结构设计进行了重点论述,通过BIM等技术,对工程结构、池体结构设计及相关因素进行了重点分析,探究了关键技术及手段,希望可以有效提高建筑安全防护综合能力,提高建筑结构设计品质。

城镇污水处理厂池体防渗防裂技术研究

城镇污水处理对改善人居环境至关重要。污水处理厂池体作为主要构筑物承担着核心工序,防渗防裂性能直接关系到其正常运行。本文以儋州市东成镇镇墟污水处理工程为例,分析了该工程池体防渗防裂的特点和难点,针对性地提出了材料选择、配合比优化、施工工艺控制以及特殊部位处理的技术措施,旨在指导类似工程的设计和施工,确保污水处理设施的长期安全运营。

钢结构池体防水堵漏施工技术

文章对武汉的一座临时污水处理厂钢结构池体后期防水堵漏施工工艺进行了总结,池体渗漏主要在钢结构预埋构件与混凝土筏板结合处,随着防水材料的不断发展和国外新材料新技术的不断进入市场,很多建筑防水材料。结合专家意见,施工单位先后采用了水泥基渗透结晶封堵、双组份聚硫密封膏封堵、聚脲材料封堵、聚氨酯注浆封堵、JS材料涂刷封堵。经过长期的堵漏试验和后期维保运营实践,确定了施工周期短,抗渗耐压效果好,耐腐蚀效果佳,造价费用低的池体内侧JS防水材料涂刷的方式。该施工方案能够很好的满足钢结构池体后期的耐压、防腐、防水、堵漏需求,希望本论文对以后的水工结构堵漏或临时污水厂工程的建设起到一定的积极作用。

全地埋式污水处理厂主体结构设计要点分析

全地埋式污水处理厂具有结构体量大、受力及空间布置复杂等特点。文中以广州地区某全地埋式污水处理厂为例,对主体结构选型、池体结构设计、抗浮设计、超长结构设计等要点进行详细探讨。该工程实例可为其他类似工程的设计提供参考。

水处理结构钢筋混凝土抗渗工艺及措施

本文根据施工经验并结合理论分析,对池体渗漏机理进行了研究,总结了各种情况下的处理工艺。

A review of hard carbon anodes for rechargeable sodium-ion batteries

Hard carbons(HCs)are recognized as potential anode materials for sodium-ion batteries(SIBs)because of their low cost,environmental friendliness,and the abundance of their precursors.The presence of graphitic domains,numerous pores,and disordered carbon layers in HCs plays a significant role in determining their sodium storage ability,but these structural features depend on the precursor used.The influence of functional groups,including heteroatoms and oxygen-containing groups,and the microstructure of the precursor on the physical and electrochemical properties of the HC produced are evaluated,and the effects of carbonization conditions(carbonization temperature,heating rate and atmosphere)are also discussed.

某国外污水处理厂污泥厌氧消化池工艺设计

“一带一路”沿线某南亚内陆国家排水基础设施落后,基本处于停滞状态,随着城市发展及人口的不断增长,城市水污染问题日益突显,为了缓解日益严峻的水污染现状,亚洲开发银行在加德满都谷地援建三座污水处理厂,处理出水排入当地河流,为了减少二次污染,设计采用污泥消化产沼气,沼气用于锅炉供热及发电,实现对污泥的减量化和资源化利用,消化段工艺设计是污泥资源化利用的关键节点。以D污水厂为例,对消化池的工艺设计进行探讨。

Study of organic solar cells with stacked bulk heterojunction structure

Organic solar cells with stacked bulk heterojutaction（BHJ） are investigated based on conjugated polymer. By using the solution spin-coating method, Poly[2-methoxy, 5-（2＇ -ethyl-hexyloxy） -1,4-phenylene vinylene] （MEH-PPV） and ZnO nanoparticles （50 nm） are mixed as the optical sense layer. Ag is used as inter-layer to connect the upper BHJ cell and the lower cell. The structures are ITO/PEDOT：PSS/MEH-PPV lAg / MEH-PPV：ZnO/Al. The open circuit voltage （Voc） of a stacked cell is about 3.7 times of that of an individual organic solar cell （ITO/PEDOT：PSS/MEH-PPV/Al）. The short circuit current （Jsc） of a stacked cell is increased by about 1.6 times of that of individual one.

First-principles investigation on structural and electrochemical properties of NaCoO_2 for rechargeable Na-ion batteries

NaxCoO2 is a commonly used cathode material for sodium ion batteries because of its easy synthesis, high reversible capacity and good cyclability. The structural and electrochemical properties of NaxCoO2 during sodium ion insertion/extraction process are studied based on first principles calculations. The calculation results of crystal structure parameters and average intercalation voltage are in good agreement with experiment data. Through calculation of the geometric structure and charge transfer in charging and discharging processes of NaxCoO2, it is found that the oxygen atom surrounding Co of the CoO6 octahedral screens the coulomb potential produced by sodium vacancy in NaxCoO2, and the charge is removed from the entire Co-O layer instead of the Co atom adjacent to sodium vacancy when sodium ions are extracted from the Na CoO2 lattice. Thus, during the insertion/extraction of sodium ion from Na CoO2, the CoO6 octahedral structure undergoes small lattice distortion, which makes the local structure quite stable and is beneficial to the cycling stability of the material for the application of sodium ion batteries.

Power Delivery Studies of Windbelt Generators with Different Architectures

Windbelt generators have been proposed as small, green power sources for battery charging applications. Some of the reported results lack detailed information about how key parameters influence the output power of the generator. In this work, we built prototypes with different architectures to study the voltage generation and power delivery as functions of belt tension, length, and electrical load at various wind speeds. We also studied the maximum power delivery conditions before the breakdown of the belt oscillation occurs. Our results are obtained from windbelt generators with two types of architectures： a conventional design with an adjustable belt that uses weight for tension control, and a revised design with a belt oscillation perpendicular to the coil axis. We have concluded that the breakdown of the belt oscillation at lower output resistances is a primary bottleneck that will limit windbelt systems to only very low power applications.

Efficient perovskite solar cells based on novel three-dimensional TiO2 network architectures

Mesoscopic lead halide perovskite solar cells typically use TiO2 nanoparticle films as the scaffolds for electron-transport pathway and perovskite deposition. Here, we demonstrate that swelling-induced mesoporous block copolymers can be templates for producing three- dimensional TiO2 networks by combining the atomic layer deposition technique. Thickness adjustable TiO2 network is an excellent alternative scaffold material for efficient per- ovskite solar cells. Our best performing cells using such a 270 nm thick template have achieved a high efficiency of 12.5 % with pristine poly-3-hexylthiophene as a hole transport material. The high performance is attributed to the direct transport pathway and high absorption of scaf- folds, small leakage current and largely reduced recombi- nation rate at interfaces. The results show that TiO2 network architecture is a promising scaffold for meso- scopic perovskite solar cells.

Three-dimensional porous V2O5 hierarchical octahedrons with adjustable pore architectures for long-life lithium batteries

Three-dimensional （3D） porous V2O5 octahedrons have been successfully fabricated via a solid-state conversion process of freshly prepared ammonium vanadium oxide （AVO） octahedrons. The formation of AVO octahedrons is a result of the selective adsorption of capping reagents and the favourable supersaturation of growth species. Subsequently, 3D porous V2O5 octahedrons were obtained by simple thermolysis of the AVO octahedrons via a calcination treatment. As cathode material for lithium batteries, the porous V2O5 octahedron cathode exhibits a capacity of 96 mAh·g^-1 at high rate up to 2 A·g^-1 in the rang of 2.4 4 V and excellent cyclability with little capacity loss after 500 cycles, which can be ascribed to its high specific surface area and tunable pore architecture. Importantly, this facile solid-state thermal conversion strategy can be easily extended to controllably fabricate other porous metal oxide micro/nano materials with specific surface textures and morphologies.

Nanotube photovoltaic configuration for enhancement of carrier generation and collection

We report on the growth of geometric feature tuned semiconductor nanotubes on a transparent substrate through the application of an anodic aluminum oxide membrane-assisted method. Three-dimensional nanotube solar cells are developed in which semiconductor absorbers are not only used to fill the inner core of the nanotubes, but also to replace the membrane and to fill the intertube space between the nanotubes. The nanotube solar cells generate and separate carriers in three dimensions, namely, inside the cores of the nanotubes, in the intertube space between the nanotubes along the radial direction, and above the nanotubes along the axial direction. In preliminary experiments conducted to demonstrate the potential of this approach, nanotube CdS-CdTe solar cells were fabricated. CdS nanotubes with an inner diameter, wall thickness and intertube spacing of 35, 20, and 35 nm, respectively, were grown; the porosity and CdS nanotube density were 36.5% and 2.26 × 10^10 nanotubes/cm^2, respectively. These features of CdS nanotubes enable more efficient carrier collection because of the reduced recombination, especially in those cases in which the minority carrier lifetime is short, thus resulting in a diffusion length of less than 100 nm. Nanotube CdS-CdTe solar cells exhibit a wide and strong spectral response and quantum efficiency, indicating enhanced light absorption and carrier generation and collection. Without the benefit of an antireflection coating, the cells exhibited a wide and strong spectral response of quantum efficiency, and a short current density of 25.5 mA/cm^2, an open circuit voltage of 750 mV, and a power conversion efficiency of 10.7% under 1-sun illumination. The materials and electro-optical characterizations indicated well-defined junction and interface behavior in these 3D nanotube solar cell configurations.

Reconstruction of solid oxide fuel cell electrode microstructure and analysis of its effective conductivity

The effective conductivity （aeff） of solid oxide fuel cell （SOFC） electrode is an important parameter for predicting the ohmic loss in SOFC. This paper investigates the effective conductivity of SOFC electrodes recon- structed numerically by packing spherical particles in a computational domain, followed by a dilation process to simulate the sintering procedure. The effects of various parameters on the effective conductivity of the electrodes are investigated, including material composition, porosity, particle size and contact angle. Results show that the effective conductivity ratio （aeff/ao） of the computed con- ducting phase is mainly affected by its total volume frac- tion （VF） in electrode （including the porosity）. The effective conductivity can be improved by increasing the VF, electrode particle size or the contact angle between electrode particles. Based on the numerical results, the conventional percolation model for the calculation of O＇eft is improved by adjusting the Bruggeman factor from 1.5 to 2.7. The results are useful for understanding the microstructure properties of SOFC composite electrode and for subsequent electrode optimization.

Research on the surface passivation of nanostructure-textured crystalline silicon solar cell

Nanostructure-textured solar cell owns unique properties but has some shortages especially in its fabrication and passivation.In this paper,nanostructures for crystalline silicon solar cell have been synthesized by controllable method based on silver catalyzed chemical etching.In this way,only the front surface of cell is etched and rear surface is protected.It was found that cells textured via the new method obtained equally excellent optical while superior electrical properties compared with those textured via traditional HF/AgNO3 etching.The V OC and I SC of the cell were improved by 6% and 11%,respectively.Then the cells were passivated via a bi-layer passivation(SiO2 & SiN x),in contrast to traditional SiN x passivation.It was also found that cells with new passivation exhibited improved V OC and I SC by 4% and 25%,respectively.The encouraging results can provide fundamental data for developing the nanostructure-textured crystalline silicon solar cell in following researches.