几种杀虫剂防治温室白粉虱药效试验

蕃茄保护地内对温室白粉虱的药效试验结果表明：供试的几种杀虫剂以阿维菌素、吡虫啉和丁硫克百威对白粉虱成虫具有较优良的防效，以２０００￣３０００倍稀释液喷雾施用，涌有效控制其为害。对两种常用药剂也进行了评价。     

聚乙烯红外光转换功能棚膜的研究

研究了光转换剂和红外陶瓷粉对薄膜保温性能的影响 ,同时研究了防静电剂、防雾滴剂对薄膜防静电和防雾滴性能的影响 ,摸索出了聚乙烯红外光转换功能棚膜的最佳配方。实验结果表明 :在寒冷的冬季 ,红外功能膜可以提高棚内地表温度 2～ 3℃。     

Biogenic versus abiogenic emissions from agriculture in the Netherlands and options for emission control in tomato cultivation

In this paper, present-day emissions of greenhouse gases and acidifying compounds from agriculture are analysed at the farm level. Quantitative estimates are given for these emissions from three nested systems in the Netherlands: the agricultural sector, greenhouse horticulture, and tomato cultivation under glass. Total emissions are subdivided into emissions from biogenic sources and abiogenic sources. We conclude that, although most of the emissions from the agricultural sector have biogenic sources, those from abiogenic sources should not be neglected. Abiogenic emissions are mainly from greenhouse horticulture. The cost-effectiveness of options to reduce carbon dioxide (CO₂) and nitrogen oxides (NO_x) emissions from on-farm combustion of natural gas in tomato cultivation under glass is analysed. An inventory is given of technical reduction options that are presently available in practice. Based on information about the costs and the reduction potential of each option, cost-efficiency curves are derived for both types of emissions. Relative to a situation where none of the described options were applied (early nineties), CO₂ and NO_x emissions from tomato cultivation can be reduced at most by about 70% and 75%, respectively, by combinations of technical options. This revised version was published online in August 2006 with corrections to the Cover Date.     

Experimental determination of the overall heat loss coefficient for energy requirement of greenhouse heating

This paper presents an experimental determination of energy requirement for greenhouse heating. The overall heat loss coefficient, heat input, the control factor for air‐tightness, the rate of heat loss and the thermal screen effectiveness were calculated. The relationships between the overall heat loss coefficient and the wind speed, and the outside temperature were modelled, including the measured and calculated values. It was found that the thermal screen effectiveness was 16 and 19.8% for the polyethylene (PE) and polyester screens, respectively. Copyright © 2005 John Wiley & Sons, Ltd.     

Life cycle emissions analysis of two nZEB concepts

The net-zero emissions building (nZEB) performance is investigated for building operation (EO) and embodied emissions in materials (EE) for Norway's cold climate. nZEB concepts for new residential and office buildings are conceived in order to understand the balance and implications between operational and embodied emissions over the building's life. The main drivers for the CO₂ equivalent (CO₂e) emissions are revealed for both building concepts through a detailed emissions calculation. The influence of the CO₂e factor for electricity is emphasized and it is shown to have significant impact on the temporal evolution of the overall CO₂e emissions balance. The results show that the criterion for zero emissions in operation is easily reached for both nZEB concepts (independent of the CO₂e factor considered). Embodied emissions are significant compared to operational emissions. It was found that an overall emissions balance including both operational and embodied energy is difficult to reach and would be unobtainable in a scenario of low carbon electricity from the grid. In this particular scenario, the net balance of emissions alone is nonetheless not a sufficient performance indicator for nZEB.     

温室气体清单编制的思路和基本原则

文章简要介绍了企业建立温室气体排放清单的编制思路和基本原则。文章通过分析编制温室气体清单时如何确定编制范围,关键排放源,计算原理与方法,排放因子和活动强度,以及清单质量保证的注意事项,作者提出了组织（企业）建立温室气体排放清单的建议。     

论ISO14064与广东省温室气体减排

在介绍ISO14064来源的基础上,说明ISO14064的组成、目的和实施要求等关键问题。分析广东省温室气体减排现状,提出广东企业或其它组织实施ISO14064所需注意和解决的关键问题。     

实现我国承诺的2020年减排指标的设想

介绍气候变化的危害原因和我国能源利用效率与发达国家的差距,提出推进碳减排工作及发展低碳经济,以实现我国承诺的2020年减排指标的设想。     

Experimental and theoretical comparative analysis of modified graphene (G-O,Pd-G,Pd-G-O) sensing performance toward SO2 in agricultural greenhouse

Sulfur dioxide (SO₂) is one of the main harmful gas in agricultural greenhouse. Its concentration can effectively reflect the health status of plants in agricultural greenhouse. In this paper, the adsorption characteristics of SO₂ on modified graphene-based were studied in comparison. The adsorption models of epoxy grouped graphene (G-O), palladium doped graphene (Pd-G) and epoxy and palladium co-doped graphene (Pd-G-O) to SO₂ were established based on the first-principles, analyzing in terms of adsorption energy, density of states, orbitals, charge density and desorption time of the adsorption models. The results showed that Pd-G-O exhibited strong chemisorption with adsorption energy of -1.237 eV. Furthermore, three modified graphene-based sensing materials were prepared via the redox method in this paper, and their crystal morphology and chemical elemental composition were investigated by transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS), respectively. The response performance of the graphene-based sensor to SO₂ was tested by a gas-sensitive testbed. The test results confirmed that the response of the Pd-G-O sample to 50 ppm SO₂ at room temperature was 10.5 (1.567 and 1.235 times than that of G-O, Pd-G). Pd-G-O provides theoretical basis and experimental support for the development of a highly sensitive and fast response sensor for the detection of harmful gases in agricultural greenhouse.     

采用ZigBee技术的温室环境监控系统设计

为了解决我国北方冬季寒冷干旱地区蔬菜种植的问题,最佳的温室气候所发挥的作用变得更加显著.设计实现基于ZigBee技术的温室环境监测系统,给出了系统的总体方案.结合温室环境变化特性及采集要求,给出了网络中节点硬件和软件的设计方案,构建无线数据采集网络.该系统把某区域采集到的温湿度参数数据传送到ZigBee协调器节点,再由协调器节点传输到PC.然后,在IAR IDE环境中对无线传感器节点程序进行设计和调试,从而实现对温室环境的监测与控制.实验表明该系统运行效果良好,被测数据可以实时上传到上位机进行显示和记录.