The Mincrosoft.NET Framework library provides a rich set of components and services for applications, greatly increasing the efficiency of software development. As the HttpHandler features no control parsing, it does ...The Mincrosoft.NET Framework library provides a rich set of components and services for applications, greatly increasing the efficiency of software development. As the HttpHandler features no control parsing, it does not need to go through complicated page processing. Thus, the efficiency is significantly improved. It is especially suitable for the case where the server does not need to return HTML results to the client. This article demonstrates a simple application where HttpHandler and Ajax are combined to transfer large image data to the browser page and keep the display smooth, which proves their efficacy.展开更多
This study aimed to analyze the antioxidant mechanism of four different anthocyanins in purple sweet potato. The DPPH test and the lipid peroxidation inhibition ability test were used to analyze the in vitro antioxida...This study aimed to analyze the antioxidant mechanism of four different anthocyanins in purple sweet potato. The DPPH test and the lipid peroxidation inhibition ability test were used to analyze the in vitro antioxidant activity of four anthocyanins, and then the optimal structure, bond dissociation energy(BDE) and ionization potential(IP) of the anthocyanins and their simplified molecular models were analyzed by density functional theoretical study, and the antioxidant mechanisms were explored. The results showed that OH-4′ phenolic hydroxyl group of the four anthocyanins has the highest activity, and its bond dissociation energy is less than that of resveratrol. The theoretical calculation results of antioxidant activity are consistent with the results of in vitro antioxidant tests. The results showed that anthocyanins of purple sweet potato have good antioxidant activity, and the DFT method provides a powerful theoretical basis for the development of anthocyanin antioxidant activity.展开更多
an air cleaner employing pulse induced plasma chemical process to remove dust and carbon monoxide (CO) in road tunnels is presented, which is composed of mainly a precipitator, a reactor, a flow control system, a powe...an air cleaner employing pulse induced plasma chemical process to remove dust and carbon monoxide (CO) in road tunnels is presented, which is composed of mainly a precipitator, a reactor, a flow control system, a power supply and a measurement system. Its performances are studied in simulated air conditions. It is found that the rate of dust removal is dependent on the voltage of the pulse power, the distance between the two dust collecting plates of the electrostatic precipitator, the effective length of the precipitator and the air flow rate in the precipitator, and that of CO removal is affected by the voltage and frequency of the super pulse power, the air flow rate in the reactor and the relative humidity of air. Applying such an cleaner of a proper design to the treatment of polluted air at a flow rate of 7 m/s can achieve the rate of dust removal up to 93 % and that of CO removal up to 72.6 %, which efficiently controls the concentrations of CO and dust under allowable limits. It is implied that the proposed air cleaner is a potential solution to air control in road tunnels, and is prominent for its performances and saving the huge cost of longitudinal ventilation tunnel or vertical vent and ventilation facilities.展开更多
In order to expand the application of poly（p-dioxanone） or PPDO in biomedical area,a series of novel copolymers were synthesized successfully by one-step,melted copolymerization of p-dioxanone（PDO） and L-phenylala...In order to expand the application of poly（p-dioxanone） or PPDO in biomedical area,a series of novel copolymers were synthesized successfully by one-step,melted copolymerization of p-dioxanone（PDO） and L-phenylalanine N-carboxyanhydride（L-Phe-NCA） monomers.With the in-feed molar ratio of L-PheNCA /PDO equal to 1/20,the conversions of the two kinds of monomers were calculated from 1H NMR. The average molecular weight and polydispersity of the copolymer increase with the increasing reaction time and catalyst concentration.However,the conversions of the two kinds of monomers did not change with the reaction conditions.A three-step mechanism is presented and proved by high resolution 1H NMR and IR spectrums.展开更多
基金Financial support for this work,provided by the Key Basic Research Program of China(Nos.2010CB226800 and 2007CB202200)National Natural Science Foundation of China(No. 50490270)the Innovation Team Development Program of the Ministry of Education of China(No.IRT0656)
文摘The Mincrosoft.NET Framework library provides a rich set of components and services for applications, greatly increasing the efficiency of software development. As the HttpHandler features no control parsing, it does not need to go through complicated page processing. Thus, the efficiency is significantly improved. It is especially suitable for the case where the server does not need to return HTML results to the client. This article demonstrates a simple application where HttpHandler and Ajax are combined to transfer large image data to the browser page and keep the display smooth, which proves their efficacy.
基金Supported by National Natural Science Foundation of China(81772290)Sichuan Provincial Key Laboratory of Brewing Biotechnology and Application(NJ2017-04)Open Fund of Sichuan Provincial Key Laboratory of Solid State Fermentation Resources Use(2016GTJ004)
文摘This study aimed to analyze the antioxidant mechanism of four different anthocyanins in purple sweet potato. The DPPH test and the lipid peroxidation inhibition ability test were used to analyze the in vitro antioxidant activity of four anthocyanins, and then the optimal structure, bond dissociation energy(BDE) and ionization potential(IP) of the anthocyanins and their simplified molecular models were analyzed by density functional theoretical study, and the antioxidant mechanisms were explored. The results showed that OH-4′ phenolic hydroxyl group of the four anthocyanins has the highest activity, and its bond dissociation energy is less than that of resveratrol. The theoretical calculation results of antioxidant activity are consistent with the results of in vitro antioxidant tests. The results showed that anthocyanins of purple sweet potato have good antioxidant activity, and the DFT method provides a powerful theoretical basis for the development of anthocyanin antioxidant activity.
基金Visiting Scholar Foundation of Key Lab. for the Exploitation of Southwestern Resource & the Environmental Disaster Control Engineering in Chongqing University.
文摘an air cleaner employing pulse induced plasma chemical process to remove dust and carbon monoxide (CO) in road tunnels is presented, which is composed of mainly a precipitator, a reactor, a flow control system, a power supply and a measurement system. Its performances are studied in simulated air conditions. It is found that the rate of dust removal is dependent on the voltage of the pulse power, the distance between the two dust collecting plates of the electrostatic precipitator, the effective length of the precipitator and the air flow rate in the precipitator, and that of CO removal is affected by the voltage and frequency of the super pulse power, the air flow rate in the reactor and the relative humidity of air. Applying such an cleaner of a proper design to the treatment of polluted air at a flow rate of 7 m/s can achieve the rate of dust removal up to 93 % and that of CO removal up to 72.6 %, which efficiently controls the concentrations of CO and dust under allowable limits. It is implied that the proposed air cleaner is a potential solution to air control in road tunnels, and is prominent for its performances and saving the huge cost of longitudinal ventilation tunnel or vertical vent and ventilation facilities.
基金supported financially by the "Western Light" joint researcher program of Chinese Academy of Science
文摘In order to expand the application of poly（p-dioxanone） or PPDO in biomedical area,a series of novel copolymers were synthesized successfully by one-step,melted copolymerization of p-dioxanone（PDO） and L-phenylalanine N-carboxyanhydride（L-Phe-NCA） monomers.With the in-feed molar ratio of L-PheNCA /PDO equal to 1/20,the conversions of the two kinds of monomers were calculated from 1H NMR. The average molecular weight and polydispersity of the copolymer increase with the increasing reaction time and catalyst concentration.However,the conversions of the two kinds of monomers did not change with the reaction conditions.A three-step mechanism is presented and proved by high resolution 1H NMR and IR spectrums.
