Search

With TEMPO-NaClO-NaBr as the selective oxidation system, the oxidized corn starch was prepared from the corn starch, substituting traditional pre-gelatinized corn starch. The relationship of the carboxyl mass fraction of the oxidized starch and the dosage of oxidant was studied under the conditions such as: the mass of the corn starch was 5.0g, the pH was 10.00, the reaction temperature was 20 °C. The structure of the oxidized corn starch was characterized by IR. The results showed that when the consumption of NaClO was 67.5 mL, the reaction time was 2.5 h, the carboxyl of oxidized starch can reach 10.60%.

A new vision-based approach for robust vehicle detection is addressed in this study. First, fast wavelet transform (FWT) is proposed to extract image texture, while grey level co-occurrence matrix (GLCM) is employed to measure and analyze the extracted texture. Then, vehicles can be extracted because the vehicle sections and the shadow sections have different textures in the foreground image. Moreover, we put forward the state and observation matrixes of Kalman filter which can be used to track vehicles under complicated traffic scenes. Experimental results in real traffic scenes show that the proposed methods are effective and efficient.

Fermentation process using recombinant strain for production of recombinant protein is widely used in commercialization of the biotechnologies. The continuous stirred tank reactor (CSTR) is a typical microbial cultivation method, has the major advantage of high productivity. Mathematical modeling and simulation is useful for analysis and optimization of the CSTR fermentation process. Most of the mathematical models developed for CSTR are black box models without information of the intracellular dynamics and regulations. In this research, a mathematical model is built based on gene regulation for recombinant protein production using CSTR, and simulation is made using this model.

Shenfu coal (SFC) was pulverized and modified with planetary ball mill. Maceral separation of the coal was performed by means of density gradient centrifuge in zinc chloride solution. Blends from low density polyethylene (LDPE) and parent coal powder, iron ions loaded coal powder, or floated maceral fractions were prepared in co-rotation twin-screw extruder. Pyrolysis characteristics were investigated based on differential scanning calorimetry (DSC) measurements, apparent activation energies were calculated according to Kissiger and Ozawa methods. It is found that chemical interaction between SFC and LDPE is attributed to their overlapped pyrolysis temperature regions, leading to instant and rapid propagation and termination of macromolecular chains produced in the co-pyrolysis. Iron ions loaded in the coal can facilitate formation of radicals with acceleration in chemical reaction rates. Thermal degradation of LDPE is rate-determining step in co-pyrolysis of the coal and the polyethylene. Maceral fraction floated in 1.25g·cm-3zinc chloride solution is more reactive with polyethylene due to its higher content in aliphatic hydrocarbon and hydrogen, playing a role of excellent hydrogen donor to LDPE in the co-pyrolysis.

Variations of heavy metals in sludge during microwave pyrolysis and muffle pyrolysis were analyzed by means of scanning electron microscope (SEM) and inductively coupled plasma atomic emission spectrometer (ICP-AES). Increased basicity of residues from the sludge is found. Leaching percentages of heavy metals ranging from 0.031% to 5.364% after microwave treatment are lower. Releases of cadmium, lead, zinc and copper from the residues obtained in microwave pyrolysis reduce by 92.68% compared with muffle pyrolysis. Alkaline intermediates formed in the pyrolysis residues bring about improved immobilization of heavy metals. Transformation in morphology of heavy metals and strong alkaline of the residues, lead to the immobilization of heavy metals during microwave pyrolysis.

From the angle of urban leisure space users and through the selection of urban leisure space influence factors, then based on a questionnaire survey and statistical analysis software, this article use the analytic hierarchy process and expert-scored method, and built a quantitative urban leisure space evaluation system to provide the basis for the strategy of construction and development of urban leisure space and pleasant harmonious modern city.

The wide format thermal transfer printing equipment (WFTTPE) was used for producing banners in advertising. The general layout and structure of WFTTPE were introduced and analyzed. The left box and right box have been reduced to decrease occupied areas in improved layout. The discharge smoke module has been added to reduce harmful smoke. Bearing block and bearing have been moved to the left side of support plate to dismantle easy. The location of DC motor, main control circuit board, storage battery, control panel and equipment nameplate have been adjusted with new layout adjustment of WFTTPE. The result showed that the occupied areas of WFTTPE had been reduced by one-third, and the concentration of indoor harmful smoke has been reduced by two-third. The actual applications showed that the lifetime of T6214 bearing could reach 12 months at least while the 61914 bearing lost efficacy mean three months.

The internal combustion engine should be enlarged the cylinder diameter for the Power requirements. In order to ensure the engine to work normally, it is needed to compute the strength of the connecting rod. Through adopting ANSYS software, the three-dimensional computational model is constructed, and the stress analysis is carried out. We can learn the stress field of process of deformation. Through calculation the stress and strength of connecting rod are derived. Using the stress which was calculated from ANSYS we can decide the Safety of connecting rod. In general, the analysis is meaningful to optimize the design of connecting rod.

TiO2 pillared rectorite (TPLR) had been synthesized by sol-gel method, and was characterized by XRD, TEM, BET, UV-vis DRS and FTIR. The effects of calcination temperature on the microstructure and the photocatalytic activity of the as prepared catalyst were investigated. The photocatalytic activity of the catalyst was evaluated by decomposition of Acid Red B (ARB) aqueous solution. XRD patterns revealed that TiO2 is incorporated into the interlayer of the rectorite. TEM demonstrated that TiO2 particles are present in the rectorite. The BET analysis indicated that the surface area of the sample calcined at 300°C (TPLR-300) was larger than those of other samples. The TPLR samples had high adsorption capacity and good photocatalytic efficiency in decomposition of ARB in water. FTIR spectra of the original and the recovered samples indicated that the catalyst had not chemically changed during the photocatalytic reaction.

The desorption and regeneration of a novel granular bentonite composite adsorbent were investigated in this paper. Copper ions were adsorbed onto the composite adsorbent firstly, then the effects of reagent categories, reagent concentration, desorption time, adsorbed copper ion amount, and temperature on the desorption and regeneration of the adsorbent were studied. The results show that the desorption and regeneration of the composite adsorbent adsorbed copper ions can be carried out by acids, alkalis, or salts. The desorption and regeneration efficiency are closely connected with the experimental conditions and the categories of chemical reagents. Acids have the desorption capacity for composite adsorbent after adsorbing, but they need to be regenerated by other methods. Salts have both desorption and regeneration capacity. Alkalis show the strongest desorption and regeneration capacity.