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Gas-fired vacuum hot water boiler with the advantages of high thermal efficiency, security, environmental protection, unrestricted installation location, few initial investment, low operating cost and so on, thus is popular with hot user day by day. By analyzing working principle and heat transfer property of gas-fired vacuum boiler, thermal calculation on inner structure of vacuum boiler is calculated,...
The genetic variability in uptake and distribution of cadmium (Cd) in 46 inbred lines of radish (Raphanussativus L.) were investigated. The seedlings were cultivated for 10 days in nutrient solution with 50 mg L1 CdCl2 2.5H20. The results showed that there was significant genotypic variation existed in radish with regards to Cd concentrations. The Cd content in the roots ranged from 216.57 to 1419...
Emission and control of mercury from coal combustion is an emerging and frontier area and going to attract more attention in future. During combustion of pulverized coals, most of the Hg volatilizes. Variable amounts of Hg are captured by fly ash and essentially none accumulates in the bottom ash. Hg is emitted to the atmosphere as gaseous (dominate) and solid-phase (subordinate) pollutants. In this...
Based on the existing materials and engineering practice, the basic environmental geological situation of Xi'an city is outlined. The environmental geotechnical problems which are linked with regional loess, municipal solid wastes, urban underground water, land fracture, urban underground engineering and cultural relics and historic sites preservation are completely discussed. At the same time, some...
Investigation of the adsorption behavior of organic pollutants by soils is fundamental to simulating and eventually predicting their transport in environmental compartments. The adsorption behavior of p-chlorophenol by soils from yancheng reed wetland was studied in a series of batch equilibration experiments, and experiments were analyzed by Langmuir and Freundlich isotherm equation. Results showed...
Oxygenated diesel fuel blends have a potential to reduce the emission of particulate matter (PM) and to be an alternative to diesel fuel. This paper describes a new kind of oxygenate additive, ethylene glycol monoacetate (EGM), and its effects on the characteristics of performance and emission of a compression ignition engine. The results show that the engine power outputs decrease and the BSFC increase...
The average person spends up to 80 percent of his or her time indoors. Because indoor concentrations of contaminants are often higher than the corresponding outdoor concentrations, indoor air quality (IAQ) clearly is an environmental component of significance regarding human health and comfort. This paper introduces the main category and source of main air pollutions that influences modern building...
The impetus to reduce the emission of sulfur-containing compounds into the environment has become increasingly important in recent years. COS as the main organic sulfur compounds from synthesis gas can be removed by catalytic hydrolysis. A serious of catalyst samples for COS hydrolysis was prepared by dry-mixing technique using K2CO3 as a active component mixing TiO2 with pseudo-boehmite. The property...
At soil water content of 70% water holding capacity, different long-term fertilized black soils were incubated to investigate nitrous oxide (N2O) emission. Maximal N2O emission was observed at the beginning of 24-h and 48-h incubation after the rewetting of dry soil. The treatment of combined normal fertilizer N, P with manure emitted the highest N2O-N, was up to 737 mug kg-1. Long-term application...
In 2006 and 2007, daily exposures to nitrogen dioxide were monitored in four groups of residents, including office workers, schoolchildren, taxi drivers and teachers. A total of 126 24-hour samples of personal NO2 exposure were collected with passive diffusion samplers. The results show that the average NO2 exposure is 0.049 mg/m3 overall. 11.9% of samples exceeded the national annual guideline standard,...
Methane is a potent atmospheric greenhouse gas (GHG) and second only to carbon dioxide as a contributor to global warming. To reduce the methane emissions, a thermal reverse flow reactor packed with the ceramic honeycomb monoliths and started up with a burner was developed. The methane thermal oxidation characteristics were studied experimentally. Different methane concentrations (0.3-1%) were used...
Macerals of NW coal were separated by isopycnic density gradient centrifugation (IDGC) (ZnCl2 was used as density fluid) and each macerals were undertaken forms of sulfur. Sulfur was removed by peroxyacetic acid-oxidation under ultrasonic and microwave radiation. Transformations of organic sulfur forms were expressed by XPS spectra. The results showed that forms of organic sulfur were enriched in...
Aims: The aim of our study is to reveal the natural gamma radiation dose rate in Qingdao area. Methods: The extensive large-scale environmental survey was conducted in Qingdao area in 2003. It is the first-time investigation integrating population survey and geological environment survey in China. The sampling grid was designed in 0.1 kmtimes0.1 km. For the first time the sampling area covers the...
A new electric-assisted solid phase microextraction (EA-SPME) technique using the lab-made carbonic fiber has been developed to sample organic compounds in water. The EA-SPME cell is composed by two electrodes: the working electrode is a SPME fiber and the counter-electrode is a piece of platinum (Pt) wire. Phenol, parachlorophenol, nitrobenzene and chloroform were examined under different electric...
Electrochemical disinfection has been widely investigated for its potential application in water industry. Compared with conventional chlorination disinfection, electrochemical method has shown good environmental compatibility and versatility to kill all kinds of bacteria. In general, the disinfectants have been mainly ascribed to electrogenerated active chlorines. However, the function of free radicals...
Based on mass-spring system and pressure model, we firstly present an eyeball model, which is made up of three submodels, to simulate the deformation of cornea in laser thermokeratoplasty. The results show that the shape of the simulated cornea is pretty nearly the same as that of the real one after surgery. Also a control engine of photocoagulation spots is introduced to simulate the loading of the...
A SlS (susceptible-infected-susceptible) disease spread model based on sparsely distributed crowd is proposed. In this model, the effects of crowd-density d, spread efficiency lambda and the moving of individuals on the spreading of viruses are researched. The theoretical analysis and analog simulation shows that there exist a critical value (lambdad)c, only when the product of spread efficiency and...
This paper presents the theoretical development of a revised optimal control pilot model (ROCM) based the modified optimal control model (MOCM) of human operator developed by Davidson and Schmidt. An algorithm designed for easy implantation in current computer simulation and simulator fidelity analysis is presented. Example results based upon the analysis of a tracking task using a basic dynamics...
Dichotomin B shows cell growth inhibitory activities against p-388 lymphocytic leukemia cells. However, its spatial conformation and the primary factors affecting its activity are not very clear. Here we optimize the primary structure of dichotomin B at the DFT (density functional theory) with B3LYP parameterization, HF (Hartree-Fock) and ONIOM (our own N- layered integrated molecular orbital and...
Fe/TiO2 was synthesized by chemical reduction method using NaBH4 as reducing reagent, it tested for removing (100 mg- N/L)nitrate from water photo-catalytically by irradiation with UV (20 W, 254 nm). Among the four loading content of iron in TiO2, 0%, 0.5% 1.0% 1.25%, the best result of 2 h nitrate conversion(52%) and N2 selectivity(72%) was obtained at 0.5 wt%, using formic acid as hole scavengers(0...
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