中国科学院机构知识库网格系统: 检索

Analysis of suitable private-secondary-main sewer diameters in rural areas based on cost model and hydraulic calculation 期刊论文 OAI收割
JOURNAL OF ENVIRONMENTAL MANAGEMENT, 2021, 卷号: 281, 页码: -
作者: Li, Wenkai; Zheng, Tianlong; Ma, Yingqun; Liu, Junxin

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收藏 | 浏览/下载：9/0 | 提交时间：2021/12/23

Cost Household number Length/width ratio Rural sewer Small diameter

Greywater: Understanding biofilm bacteria succession, pollutant removal and low sulfide generation in small diameter gravity sewers 期刊论文 OAI收割
JOURNAL OF CLEANER PRODUCTION, 2020, 卷号: 268, 页码: 1-13
作者: Zheng, Tianlong; Li, Wenkai; Ma, Yingqun; Liu, Junxin; Ren, Junpeng

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收藏 | 浏览/下载：25/0 | 提交时间：2021/09/15

Biofilm bacteria Greywater Pollutant Small diameter gravity sewer Sulfide

农村小管径排水管道中微生物生长与污染物转化研究 学位论文 OAI收割
北京: 中国科学院生态环境研究中心, 2020
作者: 李文凯

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收藏 | 浏览/下载：36/0 | 提交时间：2021/07/05

农村污水收集，小管径排水管道，微生物演替污染物转化有害气体 rural Sewage Collection, Small Diameter Sewer, Microorganism Succession, Pollutant Transformation, Harmful Gas

农村小管径重力式排水管道水力学特性及运行安全研究 学位论文 OAI收割
北京: 中国科学院生态环境研究中心, 2020
作者: 周良洁

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收藏 | 浏览/下载：36/0 | 提交时间：2021/07/12

农村排水，小管径重力式排水管道，数值模拟，水力学特性，管道运行安全 Rural Drainage, Small Diameter Gravity Sewers, Numerical Simulation, Hydraulic Characteristics, Sewer Operation Safety

Characteristics of sewer biofilms in aerobic rural small diameter gravity sewers 期刊论文 OAI收割
JOURNAL OF ENVIRONMENTAL SCIENCES, 2020, 卷号: 90, 页码: 1-9
作者: Li, Wenkai; Zheng, Tianlong; Ma, Yingqun; Liu, Junxin

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收藏 | 浏览/下载：15/0 | 提交时间：2021/09/15

Bacterial community Biofilms Functional bacteria Rural area Small diameter gravity sewers

Influences of flow conditions on bacterial communities in sewage and greywater small diameter gravity sewer biofilms 期刊论文 OAI收割
ENVIRONMENTAL RESEARCH, 2020, 卷号: 183, 页码: 1-11
作者: Li, Wenkai; Zheng, Tianlong; Ma, Yingqun; Liu, Junxin

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收藏 | 浏览/下载：12/0 | 提交时间：2021/09/15

Bacteria Flow condition Function Sewer biofilm Small diameter gravity sewer

Structural Changes in Iron Oxide and Gold Catalysts during Nucleation of Carbon Nanotubes Studied by In Situ Transmission Electron Microscopy 期刊论文 OAI收割
Acs Nano, 2014, 卷号: 8, 期号: 1, 页码: 292-301
D. M. Tang; C. Liu; W. J. Yu; L. L. Zhang; P. X. Hou; J. C. Li; F. Li; Y. Bando; D. Golberg; H. M. Cheng

收藏 | 浏览/下载：37/0 | 提交时间：2014/03/14

carbon nanotube nucleation growth mechanism catalyst in situ electron microscopy diameter-controlled synthesis chemical-vapor-deposition nanoparticle catalysts selective synthesis metal-catalysts small particles silicon-wafers free growth aluminum copper

The study of encoding principle and encoding disc design of a new-style vernier absolute encoder (EI CONFERENCE) 会议论文 OAI收割
2nd Annual Conference on Electrical and Control Engineering, ICECE 2011, September 16, 2011 - September 18, 2011, Yichang, China
作者: Li L.

收藏 | 浏览/下载：27/0 | 提交时间：2013/03/25

To satisfy the requirement of encoder miniaturization high dependability and high measuring accuracy a new-style vernier absolute type encoder which offered significant advantages over less reticling circles and high precision was presented in the paper which carried out the design of vernier encoding disc the analysis of new-style vernier encoding principle and exact encoding track calibration by studying the photoelectric encoder. The Matlab simulation results prove that the encoding and coding methods are feasible. The test showed that the cubage of encoder was quite small and the diameter of the encoder can be controlled within 100mm its resolution can reach 24 bits i.e. 0.0772. The feasibility of encoding and coding method was further proved. 2011 IEEE.

Optical system of large relative aperture and wide field using aspheric corrector for detecting (EI CONFERENCE) 会议论文 OAI收割
4th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Advanced Optical Manufacturing Technologies, November 19, 2008 - November 21, 2008, Chengdu, China
作者: Zhang J.; Zhang J.; Zhang J.; Wang J.

收藏 | 浏览/下载：21/0 | 提交时间：2013/03/25

The magnitude requirement of space target detecting determines that the image of detecting telescope should have several performances: small spots the wider field of view small 80% encircled energy diameter and good MTF(Modulation transfer function). So the aperture and field of view of optical system have some demands accordingly. The larger aperture the more extensive range which the telescope searches. Now most of ground telescopes whose apertures are from 500mm to 1000mm is on-axis optical system the more energy that telescope collects and higher magnitude the telescope detects so wide field of view becomes the most importance problem. To obtain large relative aperture and wide field of view the paper introduces a catadioptric telescope with small aperture aspheric refractive corrector whose conic surface will be used to remove the aberrations due to large relative aperture and wide field of view. As to the optical system there is only one aspheric refractive corrector and it is relatively easy for manufacturing because of its concave figure and normal material. The paper gives the example and optimizes this optical system with ZEMAX program. And then the paper provides a specific analysis program for testing the aspheric refractive corrector. The aperture of this optical system is 750mm and its relative aperture is 0.82 and the field of view is 3.6 diameter(diagonal). Its structure is simple and the image quality is also very good. 2009 SPIE.

Research on the support structure of the primary mirror of large-aperture telescope (EI CONFERENCE) 会议论文 OAI收割
3rd International Symposium on Advanced Optical Manufacturing and Testing Technologies, AOMATT 2007: Large Mirrors and Telescopes, July 8, 2007 - July 12, 2007, Chengdu, China
Yang W.; Jingxu Z.

收藏 | 浏览/下载：26/0 | 提交时间：2013/03/25

Large-aperture telescope can be used in surveying battlefield researching landform searching object real-time monitoring imaging detecting and identifying spatial targets and so on. A large-aperture telescope for achieving high resolution power is designed to monitor spatial target and image in real time. Real-time monitoring plays an important role in military conflicts. The orbit parameter of object quantity geometrical shape parameter and so on can be obtained by detect spatial target. With the development of optical technology people require larger aperture in optics-electronic (OE) system. By increasing optical aperture the ability of collecting light and resolution power in the system can be enhanced. But the support structure of the primary mirror of large-aperture telescope will be a very difficult problem. With the increase of primary mirror aperture the weight of the primary mirror will become larger than before. The root mean square (rms) of the primary mirror is affected by many factors such as deadweight deformation of heat environment and so on. Due to the primary mirror of telescope is an important component of telescope system. By reducing the weight of primary mirror precision of the system is ensured. During the designing phase one can consider the supporting project of the primary mirror synthetically and analyze it roundly according to technical requirement of optical system and the effect factors. The final structural design can be reasonable. In an astronomical telescope the surface of reflector is an important part for collecting dark radiation of celestial bodies. Its surface shape will have an effect on collecting efficiency of telescope radiant energy directly. So the rms must be very high. Optical system of large aperture small wavelength and small focus can receive maximal light intensity. For ground-based optical astronomical telescope the design proposed in the paper can satisfy the requirement of the possible minimum atmosphere seeing at astronomical observatory site and exert the use efficiency of the telescope adequately. So the accuracy of the traditional surface of reflector can assure that 90% of all the light energy can be focused on within the angle diameter range of the minimum atmosphere seeing then 100% of light energy should be focused on the angle diameter range of minimum atmosphere seeing. Because the rms of mirror is very high precise surface machining and accurate the support of mirror are very important tasks during designing and manufacturing the telescope. In the paper various support techniques of a large-aperture telescope primary mirror are discussed and a 3.5 meter telescope system at the Starfire Optical Range (SOR) overviewed simply which was operated by the Directed Energy Directorate of the Air Force Research Laboratory Kirtland AFB NM USA from the ground-based O-E system for the observations of spatial target. We also analyze Theoretical elastic deformation of the Steward Observatory 2.3 meter mirror is analyzed.