检索结果-南通市图书馆

Optimum insulation thickness for the sandwich structure livestock buildings external envelopes in different climate regions of China

在线全文

学校读者我要写书评

暂无评论

International Journal of Agricultural and Biological Engineering 2020年第1期13卷 29-41页

作者： Yang Wang baoming Li Weichao Zheng College of Water Resources and Civil Engineering China Agricultural UniversityBeijing 100083China Key Laboratory of Agricultural Engineering in Structure and Environment Ministry of Agriculture and Rural AffairsBeijing 100083China Beijing Engineering Research Center for Animal Healthy Environment Beijing 100083China

Determining the optimum insulation thicknesses of external envelopes for livestock buildings are one of the most effective metrics to decrease energy *** study was carried out to determine the optimum insulation thicknesses for livestock buildings in different climate zones,to examine the effects of insulation thickness and material(foam glass,mineral wool,expanded polystyrene,foamed polyurethane,foamed polyvinyl chloride,and expanded polyethylene)on life cycle total cost,life cycle savings,and payback *** finishing pig houses and laying hen buildings with sandwich wall structures(color steel laminboard)in five typical cities were studied using the degree-days method with economic *** insulation thicknesses ranged from 0.05 m to 0.25 m and 0.02 m to 0.24 m in finishing pig houses and poultry buildings,respectively;the life cycle total costs ranged from 16.49 to 37.98$/m2 and 13.37 to 36.84$/m2;the life cycle savings ranged from 29.13 to 220.60$/m2 and 0 to 202.13$/m2;and the payback period ranged from 1.11 to 5.81 years and 1.19 to 20.76 years,*** polyurethane provided the highest life cycle savings,while foam glass had the *** this research,the insulation thicknesses for the sandwich structure livestock buildings external envelopes are optimized,and the energy saving can be obtained by using proper insulation thickness in different ***,it can increase the knowledge about energy consumption in the livestock buildings and the results can be also a useful tool for farmers.

关键词： livestock building insulation material optimum insulation thicknesses degree-days life cycle total cost life cycle saving payback period

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

基于水足迹的鸡蛋生产耗水核算与评价

中国家禽 2024年第6期46卷 72-78页

作者：邢浩翰谢昀郑炜超邵思丛宏斌李保明农业农村部规划设计研究院农村能源与环保研究所北京100024 农业农村部农业废弃物能源化利用重点实验室北京100125 中国检验检疫科学研究院食品安全研究所北京100176 国家市场监管重点实验室(食品质量与安全) 北京100176 中国农业大学水利与土木工程学院农业农村部设施农业工程重点实验室北京100083 北京市畜禽健康养殖环境工程技术研究中心北京100083

为了解国内鸡蛋生产的耗水情况,探究不同蛋鸡养殖模式和蛋鸡品种对耗水情况的影响,研究利用水足迹核算方法分析评价中国5家蛋鸡养殖场的鸡蛋生产耗水情况。结果显示:5家蛋鸡养殖场的鸡蛋水足迹为2537.69~3446.85 m^(3)/t,其中,绿水足迹... 详细信息

为了解国内鸡蛋生产的耗水情况,探究不同蛋鸡养殖模式和蛋鸡品种对耗水情况的影响,研究利用水足迹核算方法分析评价中国5家蛋鸡养殖场的鸡蛋生产耗水情况。结果显示:5家蛋鸡养殖场的鸡蛋水足迹为2537.69~3446.85 m^(3)/t,其中,绿水足迹为1653.02~2314.94 m^(3)/t,蓝水足迹为484.07~616.65 m^(3)/t,灰水足迹为400.60~515.26 m^(3)/t,养殖场A中海兰褐和海兰灰品种的鸡蛋平均总水足迹分别为3042 m^(3)/t和3224 m^(3)/t;5家养殖场的鸡蛋水足迹中绿水足迹占比最高,达到66.75%,饲料消耗是影响鸡蛋水足迹的主要因素;养殖场A的鸡蛋水足迹最高,养殖场E最低;相比于海兰褐品种,海兰灰品种产蛋所消耗的饲料量、直接和间接用水更多。建议通过优化饲料配比、提高农业用水效率、增设养殖场的节水设施设备并选择适宜的蛋鸡品种能够有效降低鸡蛋水足迹。

关键词：水足迹耗水鸡蛋蛋鸡养殖用水

Synthesis and optical properties of soluble low bandgap poly （pyrrole methine） with alkoxyl substituent

在线全文

学校读者我要写书评

暂无评论

Frontiers of Optoelectronics 2016年第1期9卷 99-105页

作者： baoming LI Enkai PENG Leilei YE Zhiyin WU College of Material Science and Engineering Fuzhou University Fuzhou 350108 China

A soluble low bandgap poly （pyrrole methine） with alkoxyl substituent, poly {（3-hexanoyl）pyrrole-[2,5- diyl（p-tetradecyloxybenzylidene）]} （PHPDTBE）, was synthesized and characterized by 1H nuclear magnetic resonance （1H-NMR）, Fourier transform-infrared （FT-IR）, elemental analysis （EA） and gel permeation chromatography （GPC）. PHPDTBE was readily soluble in weak polar organic solvents. The absorption peaks of PHPDTBE solution and film were located at around 458 and 484 nm, respectively. The optical bandgaps of PHPDTBE film for indirect allowed and direct allowed transitions were measured to be 1.66 and 2.35 eV, respectively. PHPDTBE film had few defects in the energy band and the Urbach energy of PHPDTBE film was calculated to be about 0.19 eV. The resonant third-order nonlinear optical susceptibilities of PHPDTBE solution and film measured by degenerate four-wave mixing （DFWM） technique at 532nm were all in the order of 10 8 esu, which was about 1-3 orders of magnitude larger than that of the other ordinary n-conjugation polymers.

关键词： poly (pyrrole methine) low bandgap Urbachenergy third-order nonlinear optical property

全面供光策略调控废水培养光合细菌产单细胞蛋白

在线全文

学校读者我要写书评

暂无评论

农业工程学报 2024年第11期40卷 227-237页

作者：王晓丹卢海凤张光明司哺春卞含笑唐帅蒋伟忠李保明中国农业大学三亚研究院三亚572025 中国农业大学水利与土木工程学院北京100083 农业农村部设施农业工程重点实验室北京100083 河北工业大学能源与环境学院天津300401

为拓展蛋白质来源,缓解中国饲料蛋白资源短缺现状,该研究通过供光策略调控强化了沼泽红假单胞菌(***)从废水中回收菌体资源及单细胞蛋白(single cell protein, SCP)的效果,并解析了不同供光策略下物质合成与污染物降解之间的相关性。结... 详细信息

为拓展蛋白质来源,缓解中国饲料蛋白资源短缺现状,该研究通过供光策略调控强化了沼泽红假单胞菌(***)从废水中回收菌体资源及单细胞蛋白(single cell protein, SCP)的效果,并解析了不同供光策略下物质合成与污染物降解之间的相关性。结果表明:在白炽灯、120μmol/(m^(2)·s)的光强及18 h光/6 h暗(L/D)的光周期条件下菌体的生物量及日产量可达(1 140.56±19.72) mg/L及(0.32±0.02) g/(L·d),相较于24 L/0 D、 3 L/21 D及9 L/15 D组分别提高了17.06%~93.21%、54.43%~299.93%(P<0.05);在白炽灯、120 μmol/(m^(2)·s)的光强及3 h光/21 h暗的光周期条件下,菌体的蛋白质质量分数最高,为67.47%,相较于其他所有试验组提高了21.96%~44.54%(P<0.05)。化学需氧量(chemical oxygen demand, COD)和氨氮(ammonia nitrogen, NH_(4)^(+)-N)去除率在白炽灯、120 μmol/(m^(2)·s)的光强及18 h光/6 h暗的光周期条件下可达72.03%~78.40%。相关性分析表明,光强、光质分别与蛋白质含量及浓度呈显著负相关;而光周期与蛋白质浓度呈显著正相关,因此,光周期是R. palustris从废水体系中提升SCP产量的有效调控方法。该研究为提高废水体系中光合细菌合成SCP提供了新的方法与思路。

关键词：光质光强光周期光合细菌单细胞蛋白污染物降解

基于CNKI的芦竹研究文献计量与可视化分析

在线全文

学校读者我要写书评

暂无评论

黑龙江科学 2024年第14期15卷 34-39页

作者：刘子奇田保明郭佳林位芳郑州大学农学院郑州450001

芦竹是禾本科芦竹属植物,具有速生、高产、适应性广、抗逆性强等生物学特性及广泛的应用价值。以中国期刊全文数据库为统计分析源,采用文献计量学方法,对芦竹领域2000—2023年相关文献的发文量、研究机构、学科分布、被引情况、发文期... 详细信息

芦竹是禾本科芦竹属植物,具有速生、高产、适应性广、抗逆性强等生物学特性及广泛的应用价值。以中国期刊全文数据库为统计分析源,采用文献计量学方法,对芦竹领域2000—2023年相关文献的发文量、研究机构、学科分布、被引情况、发文期刊、资助基金、发文作者等内容进行计量与可视化分析。结果表明,芦竹研究目前保持着较高的热度,2022年和2023年均有41篇文献发表;高等农业院校是芦竹研究的重点机构,研究重点主要集中在环境科学与资源利用、生物学和园艺方向;《中国林业产业》是发表芦竹相关研究最多的期刊,被引次数最多的文献是发表于《生态学报》的“人工湿地植物对观赏水中氮磷去除的贡献”,引用次数达524次;国家和地方对芦竹研究都提供了大力的支持,共有19种基金项目支持了相关研究;确定了34位核心作者和20位高发文量作者,目前形成了4个合作团队,但多为单位内合作,未有大的合作网络关系形成。此分析结果从定量角度展示了我国芦竹相关研究发展趋势与现状,可为芦竹的深入研究与利用提供参考。

关键词：芦竹 CNKI 文献计量可视化分析

Study on Interface Structure and Bond Properties between Cemented Carbide and Tool Steel Blazing with amorphous alloy

在线全文

学校读者我要写书评

暂无评论

材料热处理学报 2004年第5期25卷 101-104页

作者： baoming-dong XuJin-fu XuXue-bo ZouGui-sheng HuangGeng-hua ResearchInstituteofMaterials＆Technology NingboCollegeNingbo315016China DepartmentofMechanicalEngineering Tsinghua-UniversityBeijing100084China StatekeylaboratoryforMechanicalBehaviorofMaterials Xi＇anJiaotongUniversityXi＇an710049China／ResearchInstituteofMaterials＆TechnologyNingboCollegeNingbo315016China

Cemented Carbide YG11C and Tool Steel Crl2MoV was blazed with Ni-base amorphous alloys, QG-1011, MBF-20 and MBF-75, using dynamics thermodynamics analogue testing machine Gleeble 1500D. The effects of brazing temperature, holding time and holding pressure on micro-structure and bond strength were investigated. Results showed that YG11C and Crl2MoV were all wetted well by these three Ni-base alloys, and the bond strength was as high as 220MPa, 320MPa, 320MPa respectively. When the blazing temperature was at the point over the melting point 60-70°C of Ni-base alloy, the holding time was about 2-10min, the suitable pressure was benefit for improving the brazing quality. Microanalysis showed Co in cemented carbide diffused into liquid brazing alloy and formed the Fe-Co solid .solution.

关键词：镍合金烧结硬质合金工具钢无定形合金炽烧

Orthogonal analysis of water model study on the optimization of flow control devices in a six-strand tundish

在线全文

学校读者我要写书评

暂无评论

Journal of University of Science and Technology Beijing 2007年第2期14卷 118-124页

作者： Zhengyan Wei Yanping Bao Jianhua Liu Wenxu Gong baoming Wang Metallurgical and Ecological Engineering School University of Science and Technology Beijing Beijing 100083 China Tianjin Iron ＆ Steel Co. Ltd. Tianjin 300180 China

Improper flow control devices in a multi-strand tundish can cause some problems, for example, liquid steel cannot reach every nozzle at the same time and the liquid steel in nozzles far away from the entry zone has a lower temperature. The water model experiment of a six-strand tundish of Tianjin Iron ＆ Steel Co. Ltd. was performed, a new ＂U＂ type baffle was obtained, and its parameters were defined by perpendicular analysis. The ＂U＂ baffle can not only improve those imperfections, but also prolong the residence time of nonmetallic inclusions, which is good for their flotation and separation.

关键词： six-strand tundish water model flow control devices optimization

An optimized solar-air degree-day method to evaluate energy demand for poultry buildings in different climate zones

在线全文

学校读者我要写书评

暂无评论

Frontiers of Agricultural Science and Engineering 2020年第4期7卷 478-489页

作者： Yang WANG baoming LI Department of Agricultural Structure and Bioenvironmental Engineering College of Water Resources and Civil EngineeringChina Agricultural UniversityBeijing 100083China Laboratory of Agricultural Engineering in Structure and Environment Ministry of Agriculture and Rural AffairsBeijing 100083China Beijing Engineering Research Center for Animal Healthy Environment Beijing 100083China

The degree-day method is widely used to determine energy consumption but cannot be directly applied to poultry buildings without improvements in its *** study was designed to optimize the degreeday calculation and proposes a solar-air degree-day method,which can be used to calculate the cooling and heating degree-days and the annual cooling and heating loads under different climate conditions for poultry *** this paper,the solar-air degree-day method was proposed,which considers the effects of solar radiation with different wall orientations and surface *** Chinese cities,Harbin,Beijing,Chongqing,Kunming and Guangzhou,were selected to represent different climate zones to determine the solar-air *** heating and cooling energy requirements for different climates were compared by DeST(Designer’s Simulation Toolkit)simulation and the solar-air degreeday *** to decrease energy consumption were *** results showed that the maximum relative error was less than 10%,and the new method was not significantly different from the DeST simulation(P>0.05).The accuracy of calculating energy requirements was improved by the solar-air degree-day method in the different climate *** and surface color effects on energy consumption need to be considered,and external walls of different orientations should have different surface colors.

关键词： base temperature energy consumption solar radiation orientation surface color

在线全文

学校读者我要写书评

暂无评论

小麦秸秆热解过程中的热行为分析

上海工程技术大学学报 2024年第2期38卷 153-157页

作者：关雲龙郭韵陈宝明上海工程技术大学机械与汽车工程学院上海201620 上海理工大学环境与建筑学院上海200093

热解温度和热解速率是影响小麦秸秆产物的重要因素。为探究温度与速率对小麦秸秆热解过程的影响,在Fluent仿真软件中建立小麦秸秆热解过程的动力学模型和热力学模型,分析其热行为,模拟不同升温速率和热解温度下小麦秸秆的热解过程。模... 详细信息

热解温度和热解速率是影响小麦秸秆产物的重要因素。为探究温度与速率对小麦秸秆热解过程的影响,在Fluent仿真软件中建立小麦秸秆热解过程的动力学模型和热力学模型,分析其热行为,模拟不同升温速率和热解温度下小麦秸秆的热解过程。模拟结果表明,热解速率和热解温度越高,焦炭等固体产物产率越少,气体产物产率越多。

关键词：小麦秸秆热解热解速率热解温度