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The paper studies change of enzyme activity with increasing cropping years in greenhouse soil. We furthermore took mancozeb, which was a fungicide commonly used in greenhouse soil in North China, as an example to study the change difference of greenhouse soil enzyme activity with different cropping years after addition of external agricultural chemical material. We found that with increasing cropping...
Hydrogen sulfide (H2S), an extremely corrosive and toxic gas, was commonly generated by urban treatment plants, gas and oil refineries, paper and pulp industries and so on. Biofiltration, which was considered as cost-effective and environment-friendly, evoked substantial attention in recent years. In this study, a biotrickling filter filled with polypropylene pall rings was constructed, where efficient...
Vic-dioximes, a class of organic chemical compounds, are proposed for the first time as effective sensing materials for the detection and quantification of organophosphates with chemical gas sensors. The described vic-dioximes are derivatives of glyoxime and were substituted in 1, 2 positions with alkylthiols of varying chain lengths. These oximes in the free form are powerful H bond donors that interact...
A resonant micro-cantilever chemical sensor with integrated piezoresistive self-sensing function is presented. On the micro-cantilever surface, multi-wall carbon nanotubes (CNTs) are immobilized and modified with specific sensing groups. Owing to the high specific-surface-area of MWCNTs and high-effective sensitive groups, the sensor has been used to detect sub-ppb trace-level trinitrotoluene (TNT)...
In the biodegradation of Formaldehyde gas with a biotrickling filter, a portion of Formaldehyde is solved in the recirculating trickling liquid. As a consequence, the treatment efficiency is limited. The study explored the feasibility of removing the liquid-phase formaldehyde by inducing chemical reactions in the trickling liquid. Experiments were conducted to test three chemicals (sodium sulfite...
The volatile oils were extracted from Typha latifolia by Water-steam distillation. Components of the volatile oils were analyzed and identified by gas chromatograph-mass spectrometry (GC-MS), and the allelopathic effect of the volatile oils were also explored by bioassay of Microcystin aeruginosa. The results showed that the volatile oils had activity to inhibit the growth of M. aeruginosa. This study...
Hexane extracts of Potamogeton maackianus were fractionated using silica gel column chromatography under room pressure by antialgal activity-guidence. Ten fractions were obtained and three of them shown obvious antialgal activities. These three active fractions were further separated using gel chromatography (Sephadex LH-20). Then the active fractions Fr 3-5, 3-7 and 3-8 were obtained and their percentage...
The low-cost activated carbon was prepared from Palm shell an agricultural waste material, by combination of chemical and physical activation with phosphoric acid and CO2, respectively for adsorption of methane. Central composite design (CCD) was applied to study the influence of activation temperature, chemical ratio of phosphoric acid to palm shell and physical activation time on the amount of methane...
Synlhesis of nanocomposites in Cu-TiB2, Cu-Ni-TiB2, Cr-Ni- TiB2 systems was developed using a combination of high-energy planetary ball milling and self-propagating high-temperature synthesis (SHS). Consolidation behavior of nanocomposite powders, microstructures and mechanical properties of the bulk materials and coatings were investigated in view of developing new materials with high temperature...
Recently, the materials scientists invented that the dye functionalized MWCNT found applications in photodynamic therapy, due to the apoptosis of targeted cancer cells by the coupled effect of photothermal as well as photodynamic effects. By grouping these ideas, a new type of material was synthesized. In the present investigation, Eosin Y, a xanthenes type dye was functionalized with MWCNT via ethylene...
This main part of this thesis is concerning with the delamination phenomenon of quad flat no leads package (QFN) between epoxy molding compound (EMC) and exposure bottom paddle in IC package assembly factories. The characteristics show that the delamination phenomenon of QFN product occurred after Electro de-flash process (ED). ED process is making use of the redox reaction to produce hydrogen (H2)...
Very little is known about analysis of distinguishing the Cold-Heat nature of Chinese herbs by multivariable statistics. We found a way of differentiating the Cold-Heat nature and discuss the relationship between polysaccharides and four nature of 20 Chinese herbs in order to identify the material basis of nature of Traditional Chinese Medicine. The polysaccharides from 20 herbs were extracted, hydrolyzed...
Sapphire crystal material has a good transmittance and its infrared transmittance hardly changes with temperature. Therefore it is widely used in lasers, infrared technology, semiconductors, measuring instruments, defense and aerospace and many other areas. But there still have the problems of low productivity, easy scratching the surface and the surface quality of instability and others on the grinding...
The advance of hi-tech Olympics has played a sustainable role in promoting the development of technology industry since the opening of modern Olympic Games. Especially a wealthy scientific results made under the demand of Olympics, and it is obvious that understanding their characteristics and assessing their quality will contribute to the decision made when we want to make technological knowledge...
ZnS:Mn nanoparticles of different size have been synthesized using a co-precipitation method. So-prepared ZnS:Mn nanoparticles with capping agent (oleic acid) then were characterized using X-ray diffraction(XRD) and UV-Vis spectroscopy. The particle size of the nanoparticles calculated from the XRD patterns has been found in the range 1.45-2.65nm. Absorption spectra have been obtained using UV-Vis...
In order to obtain some basic data for eco-toxicological tests, acute lethal toxicities of o-nitrochlorobenzene, m-nitrochlorobenzene and 2,4-dinitrotoluene in aquatic environment to Brocarded Carp were investigated. Brocarded Carp was employed and introduced into different test solutions contained three compounds. LC50 defined within 96 h was calculated by the mortality of fish using the Karbers...
To find the industry characteristics of emergency in supply chain and to solve the problem of recognition about that. The paper established causation factor indexes system of emergency in supply chain based on systems analytical method, and at the same time, put forward a industry characteristics recognition model for emergency supply chain based on fuzzy clustering utilizing fuzzy similarity relation,...
Current paper analyses the sedimentation processes in the transitional marine-lagoon system using the example of Klaipeda strait. Sedimentological investigations in the Klaipeda strait was carried out during 1994-2008 period using the sediment trap method. The most intensive fluxes were detected in the junction Curonian lagoon - strait and in the mouth of the strait. The grain size composition of...
We present a theoretical model for electrical double layers formed by ion adsorption in nanoscale carbon pores. In this work a combination of computational methods, including first-principles and classical modeling, are used to explain the onset of an anomalous increase in capacitance for small pores. The study highlights the key role played by pore curvature and nanoconfinement on the capacitance...
In this paper, we describe a method for discriminating between thyroid cell lines. Five commercial thyroid cell lines were obtained, ranging from non-cancerous to cancerous varieties. Raman spectroscopy was used to interrogate native cell biochemistry. Following suitable normalisation of the data, implicit context representation Cartesian genetic programming was then used to search for classifiers...
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