Ul94水平垂直燃烧仪的正确选择

UL94水平垂直燃烧仪,设计为对设备和器具部件材料的可燃性能试验,众多应用于最终用途产品的易燃性能、燃烧速率、火焰蔓延、燃烧强度均可被检测,目前已经被广泛应用于该类行业。     

论饮食业油烟治理技术的发展及应用

实际应用的饮食业油烟净化设备（以下简称油烟净化设备）中，以静电式、机械过滤式、湿式，以及由上述三种技术组成的复合式产品为主。荷电湿式油烟净化器的开发应用，将具有很强的市场竞争力，未来几年，静电式技术将继续被广泛采用，机械式技术将更多地作为预处理手段与其他技术组合使用，湿法技术因兼有部分除味和去除柴油灶燃烧颗粒的功能等特点将更有针对性地应用于适当的场所。优化组合而成的经济高效的复合式技术在未来市场中将占据主导地位。     

膜分离技术在电镀废水处理中的应用现状

膜分离技术作为一种新型分离技术，具有分离效率高、过程能耗低等特点，被广泛应用于废水处理领域。由于电镀废水污染物种．是多样，纳滤、反渗透、聚合物强化超滤、电渗析等膜分离过程作为电镀废水的处理与资源化技术被深入研究，纳滤、反渗透及其组合工艺等被应用于电镀废水的处理及其资源化，有着良好的应用前景。     

EBC型高效荷电分级袋式除尘器

由张家港市新中环保设备有限公司开发的EBC型高效荷电分级袋式除尘器,可应用于燃烧煤矸石、石油焦等电厂烟气粉尘浓度大、粉尘颗粒大的项目,尤其适用于燃煤锅炉电除尘器改造工程,并广泛应用于电力、冶金、建材等行业的烟气除尘或粉尘治理.     

小波分解在空气污染指数分析中的应用

本文利用Mallat分解在不同时频域的多分辩分析能力，以可吸入颗粒物污染指数为例，将其分解到不同的频域中进行分析，通过实际应用证明其效果良好。将Mallat法应用于上海市城区全年可吸入颗粒物、SO2、NO2等污染物的分析研究当中，发现秋冬两季煤、油等燃料的不完全燃烧对颗粒物浓度的增加影响最大，而汽车尾气对后两者浓度增加的影响也较大。     

生物质成型燃料(BMF)技术

由广州迪森热能技术股份有限公司开发的生物质成型燃料(BMF),可替代燃料油、天然气等化石能源应用于民用及工业锅炉的燃烧。主要技术内容一、基本原理生物质成型燃料(Biomass Pellet or Biomass Moulding     

危险废物焚烧处置的理论和实践

危险废物的焚烧处置是按化学当量与氧发生燃烧反应。组合式焚烧炉（回转窑、二燃室和炉排炉）能够将各种危险废物进行焚烧处置。危险废物先在回转窑内经过缺氧、热解干馏，生成的可燃气体和废渣分别在二燃室内和炉排上进行高温燃烧和持续燃烧，使焚烧残渣的热灼减率、燃烧效率和有机物的焚毁去除率等技术性能指标达到国家标准的要求。高温燃烧可以将烟气中的有毒有害物质分解，持续燃烧可使废渣燃尽烧透。在对危险废物进行元素成分分析的基础上，进行焚烧工艺设计、技术参数计算，并举例说明。     

农村沼气综合利用浅谈

把沼气和沼气肥料应用于农村种植业、养殖业、第三产业(加工业、服务业)等方面,使办沼气的多功能效益得到充分体现,这种应用就叫做农村沼气综合利用。沼气是一种可燃的生物气体。一立方米沼气完全燃烧后,可产生5,500大卡热量,使用先进沼气炉具,热量利用率可达60％。一盏性能好的沼气灯,燃烧沼气时的照明度相当于60～100W的电灯,具     

燃煤引起的氟污染

氟是煤中的有害元素,煤燃烧时,煤中氟被释放出来。本文叙述了煤在燃烧过程中,氟化物形态的转化、释放氟的规律、氟在大气环境中的迁移、扩散机理,为氟污染的评价和防治提供科学依据。     

汽油发动机二次补气增氧降低尾气污染的新方法

发动机的作功冲程是靠可燃混合气在燃烧过程中产生的热能完成的，可燃混合气的浓度及燃烧过程中火焰的传播速度关系到燃料燃烧的好坏，直接影响作功的质量，同时决定有害气体排放量的多少。作功冲程的过程表明，空燃比的大小、混合气的质量决定火焰传播速度，对混合气燃烧...     

The Importance of the Chosen Technique to Estimate Diffuse Solar Radiation by Means of Regression

The Ordinary Least Squares (OLS) is one of the widely used methods which is used for estimating the diffuse solar radiation. However, in order to use the OLS method in the estimation, the dataset must provide certain assumptions. In this study, alternative robust methods have been described and they were compared with the OLS method, which is used for estimating diffuse radiation frequently in an application. At the end of the analysis, the R² value obtained by the OLS method is less than the values obtained by M regression models. In other words, the explanation of the dependent value is weak when the OLS method is used. Finally, it can be said that the most appropriate method is Andrews for estimating the diffuse solar radiation.     

THE RATIONAL METHOD FOR PEAK FLOW RATE ESTIMATION1

ABSTRACT: The Rational Method continues to be the most widely used approach for estimating P-year return frequency peak flow rates for small catchments of about one square mile or less in area. The Balanced Design Storm unit hydrograph method is perhaps the second most widely used technique for estimating peak flow rates (and is the most widely used method for developing runoff hydrographs) but is generally considered to be more accurate than the Rational Method. In this paper, both of these T-year return frequency peak flow rate estimators are shown to be mathematically comparable. The close similarity between these two approximators may help explain why the Rational Method continues to be widely used even though other more computationally sophisticated techniques are readily available due to widespread computer software.     

THE GREAT DISMAL SWAMP: MANAGEMENT OF A HYDROLOGIC RESOURCE WITH THE AID OF REMOTE SÉNSING1

ABSTRACT: Both color infrared aerial photography and Landsat data are being used to provide information to meet present and future management goals for the Great Dismal Swamp National Wildlife Refuge. High and low altitude color infrared photographs are being used to study the hydrology and map the present vegetation of the swamp. A variety of significant ecologic units have been identified using these photographs. The completed maps will be used to evaluate analyses of landsat digital data. Once the present data base is compiled, it is hoped that routine analysis of Landsat data can be used for updating or to indicate areas where low altitude coverage or ground checking is desirable. The data base will also aid in identifying and evaluating trends that may provide guidelines for wetland management.     

Applying a mathematical approach to improve the tire retreading process

Problem of waste treatment is very important for environment and the share of tires in this scope is high. The aim of this paper is to analyse retreading as one very interesting way of tires’ treatment. In practice, firms involved with commercial vehicles exploitation have to decide whether to retread used tires or not, depending on the number of retreadings of used tires and travelled distances after each retreading. An approach based on Bayesian networks is proposed as a tool for decision making support in tire retreading process. Analysis is performed on database of tires’ exploitation from a company of public passenger transportation and the statistical results are used as inputs to the proposed model. The results obtained according to the proposed model provide a good basis when it comes to making a decision whether to retread or not a used tire.     

ESTIMATING TRANSMISSIVITY AND HYDRAULIC CONDUCTIVITY OF CHICOT AQUIFER FROM SPECIFIC CAPACITY DATA1

ABSTRACT: Specific capacity data obtained from Well Construction reports which are available from USGS offices, can provide useful estimates of tranamissivity (T), and hydraulic conductivity (K), of an aquifer. The Chicot Aquifer in Louisiana is one of the largest sources of fresh ground water in North America. Hydrologic data collected for the Chicot Aquifer indicate that specific capacity tests can be used in estimating local and regional values for T and K, if the Cooper-Jacob equation for transient flow is used with proper corrections for well loss and partial penetration. Where full scale pumping test data are scarce, specific capacity test data that are adequately distributed spatially can be used to map changes in T and K values and can be summarized statistically to indicate applicable regional values. A computer program called “TGUESS” which is available from International Ground Water Modeling Center, Holcomb Research Institute, was used in this study. The contour maps for T and K values are prepared for different well depth intervals to avoid wide variation of values.     

A Quantitative Safety Assessment Model For Transgenic Protein Products Produced In Agricultural Crops

Transgenic plants are now being used to develop pharmaceutical and industrial products in addition to their use in crop improvement. Using confinement requirements, these transgenic plants are grown and processed under conditions that prevent intermixing with commodity crops. Regulatory agencies in the United States have provided guidance of zero tolerance of these new industrial crops with commodity crops. While this is a worthy goal, it is theoretically unattainable. In spite of the best containment practices, there is a potential risk using any system of production due to unforeseen incidences including natural disasters or exposure to workers. The precautionary principle has been used for numerous regulated articles in addressing the potential risks of new products and technology based on a risk assessment in similar situations. We present here a risk assessment model that could be used as a start to develop an accepted model for the industry. The model is based on current risk models used for other regulated articles, but adapted for these types of products. This could be used to determine action levels in the event of an unintended exposure or to ensure that detection or confinement methods are adequate to avoid risks. As an example, aprotinin, a therapeutic protein now being produced in maize, was evaluated for potential risk to humans using this model.     

THE DEVELOPMENT OF THE NILE HYDROMETEOROLOGICAL FORECAST SYSTEM1

ABSTRACT: The National Oceanic and Atmospheric Administration is developing a river forecast system for the Nile River in Egypt. The river forecast system operates on scientific work stations using hydrometeorological models and software to predict inflows into the high Aswan Dam and forecast flow hydrographs at selected gaging locations above the dam The Nile Forecasting System (NFS) utilizes satellite imagery from the METEOSAT satellite as the input to the forecast system. Satellite imagery is used to estimate precipitation over the Blue Nile Basin using five different techniques. Observed precipitation data and climatic statistics are used to improve precipitation estimation. Precipitation data for grid locations are input to a distributed water balance model, a hill slope routing model, and a channel routing model. A customized Geographic Information System (GIS) was developed to show political boundaries, rivers, terrain elevation, and gaging network. The GIS was used to develop hydrologic parameters for the basin and is used for multiple display features.     

FTABLE Generation Method Effects on Instream Fecal Bacteria Concentrations Simulated With HSPF1

Abstract: Computer simulation models are used extensively for the development of total maximum daily loads (TMDLs). Specifically, the Hydrological Simulation Program‐FORTRAN (HSPF) is used in Virginia for the development of TMDLs for bacteria impairments. HSPF estimates discharge from a reach using function tables (FTABLES). The FTABLE relates stream stage, surface area, and volume to discharge from a reach. In this study, five FTABLE estimation methods were assessed by comparing their effect on various simulation outputs. Four “field‐based” methods used detailed cross‐sectional data collected via site surveys. A fifth “digital‐based” method used digital elevation data in combination with the Natural Resources Conservation Service Regional Hydraulic Geometry Curves. Sets of FTABLEs created using each method were used in simulations of instream bacteria concentration for a Virginia watershed. Several statistics relating to instream bacteria including long‐term average concentration, die‐off, and the violation rate of Virginia’s bacteria criterion were compared. The pair‐wise Student’s t‐test was used for the comparison. The HSPF simulations that used FTABLES estimated from digitally based data consistently produced significantly higher long‐term average instream fecal bacteria concentrations, significantly lower instream fecal bacteria die‐off, which is related to differences in residence time in the streams, and significantly higher water quality criterion violation rates.     

A Regional Classification Scheme for Estimating Reference Water Quality in Streams Using Land-Use-Adjusted Spatial Regression-Tree Analysis

Various approaches are used to subdivide large areas into regions containing streams that have similar reference or background water quality and that respond similarly to different factors. For many applications, such as establishing reference conditions, it is preferable to use physical characteristics that are not affected by human activities to delineate these regions. However, most approaches, such as ecoregion classifications, rely on land use to delineate regions or have difficulties compensating for the effects of land use. Land use not only directly affects water quality, but it is often correlated with the factors used to define the regions. In this article, we describe modifications to SPARTA (spatial regression-tree analysis), a relatively new approach applied to water-quality and environmental characteristic data to delineate zones with similar factors affecting water quality. In this modified approach, land-use-adjusted (residualized) water quality and environmental characteristics are computed for each site. Regression-tree analysis is applied to the residualized data to determine the most statistically important environmental characteristics describing the distribution of a specific water-quality constituent. Geographic information for small basins throughout the study area is then used to subdivide the area into relatively homogeneous environmental water-quality zones. For each zone, commonly used approaches are subsequently used to define its reference water quality and how its water quality responds to changes in land use. SPARTA is used to delineate zones of similar reference concentrations of total phosphorus and suspended sediment throughout the upper Midwestern part of the United States.