检索结果-南通市图书馆

Chinese Journal of Chemistry 2006年第12期24卷 1747-1753页

作者： threeprom jirasak SOM-AUM Waraporn 林金明 The Key Laboratory of Bioorganic Phosphorus Chemistry & Chemical Biology Department of Chemistry Tsinghua University Beijing 100084 China Department of Chemistry Faculty of Science Mahasarakham University Mahasarakham 44150 Thailand

A new separation system of capillary electrophoresis for the simultaneous determination of metals by using ethylenediamine tetraacetic acid （EDTA） as complexing agent and employing vancomycin as complex selector was described. The Z-shape cell capillary electrophoresis was used to enhance the sensitivity for the determination of the complexes of Cu（Ⅱ）, Ni（Ⅱ）, Co（Ⅱ） and Fe（Ⅲ） with EDTA. The partial filling method （co-current mode） was used in order to increase the selectivity of the electrophoretic method, meanwhile vancomycin was not present at the detector path during the detection of metal-EDTA complexes. The vancomycin concentration, phosphate concentration and pH of the buffer strongly influenced mobility, resolution and selectivity of the studied analytes. Under the optimal condition, the relative standard deviations （n=5） of the migration time and the peak area were less than 3.14% and 7.35%, respectively. Application of the Z-shape cell capillary electrophoresis method with UV detection and vancomycin loading led to the reliable determination of these metal ions in tap water and the recoveries were 97%-101%. The detection limits based on a signal to noise ratio of 3 ： 1 were found in the range of 2-10 μg·L^-1.

关键词： Z-shape cell capillary electrophoresis vancomycin metal ion ethylenediamine tetraacetic acid

Sequential Determination of Chromium（Ⅲ） and Total Chromium on Glass Chip Using Dual Channels with Chemiluminescence Detection Based on Luminol Reaction

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Sequential Determination of Chromium（Ⅲ） and Total Chromiu...

Simultaneous Determination of Metal Ions Using Ethylenediaminetetraacetic Acid as Complexing Agent and Aancomycin as Complex Selector by Counter Current Mode-Capillary Electrophoresis

中国化学会第二十五届学术年会

作者： Waraporn Som-aum jirasak threeprom Department of Chemistry Tsinghua University HaidianBeijing 100084 China Department of Chemistry Tsinghua University HaidianBeijing 100084 China

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Simultaneous Determination of Metal Ions Using Ethylenediami...

A Computer Vision-Based System for Metal Sheet Pick Counting

中国化学会第二十五届学术年会

作者： jirasak threeprom Waraporn Som-aum Department of Chemistry Tsinghua University Beijing 100084 China Department of Chemistry Tsinghua University Beijing 100084 China

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2023年第5期75卷 3643-3656页

作者： jirasak Ji Warut Pannakkong Jirachai Buddhakulsomsiri School of Manufacturing Systems and Mechanical Engineering Sirindhorn International Institute of TechnologyThammasat University12120Pathum ThaniThailand

Inventory counting is crucial to manufacturing industries in terms of inventory management,production,and procurement *** companies currently require workers to manually count and track the status of materials,which are repetitive and non-value-added activities but incur significant costs to the companies as well as mental fatigue to the *** research aims to develop a computer vision system that can automate the material counting activity without applying any marker on the *** type of material of interest is metal sheet,whose shape is simple,a large rectangular shape,yet difficult to *** use of computer vision technology can reduce the costs incurred fromthe loss of high-value materials,eliminate repetitive work requirements for skilled labor,and reduce human error.A computer vision system is proposed and tested on a metal sheet picking process formultiple metal sheet stacks in the storage area by using one video *** results show that the proposed computer vision system can count the metal sheet picks under a real situation with a precision of 97.83%and a recall of 100%.

关键词： Computer vision manual operation operation monitoring material counting

A Computer Vision-Based Model for Automatic Motion Time Study

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2022年第11期73卷 3557-3574页

Motion time study is employed by manufacturing industries to determine operation *** accurate estimate of operation time is crucial for effective process improvement and production *** motion time study is conducted by human analysts with stopwatches,which may be exposed to human *** this paper,an automated time study model based on computer vision is *** model integrates a convolutional neural network,which analyzes a video of a manual operation to classify work elements in each video frame,with a time study model that automatically estimates the work element *** experiment is conducted using a grayscale video and a color video of a manual assembly *** work element times from the model are statistically compared to the reference work element time *** result shows no statistical difference among the time data,which clearly demonstrates the effectiveness of the proposed model.

关键词： Motion time study computer vision convolutional neural network manual operation standard time

Production of Amylase from Saccharomyces diastaticus sp. and Hydrolysis of Cassava Pulps for Alcohol Production

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Agricultural Science and Technology(B) 2012年第8期2卷 909-918页

作者： jirasak Kongkiattikajom School of Bioresources and Technology King Mongkut's University of Technology Thonburi Bangkok 10150 Thailand.

Amylolytic enzymes are currently investigated to improve industrial processes of starch degradation. Saccharomyces diastaticus 2047 isolated from cassava waste showed amylase and glucoamylase production, using starch medium, and the highest rate was obtained in the initial growth phase, after incubation for 24 h at pH 5.5. Maximum amylase and glucoamylase activities （483.62 U mg^-1 protein and 290.85 U mg^-1 protein） were obtained at pH 5.5. The isolated enzymes exhibited thermostable properties as indicated by retention of 100% of residual activity at 55 ℃ for 45 min with total inhibition at 100 ℃. Extracellular enzyme from S diastaticus 2047 was partially purified by fractionated precipitation with ammonium sulphate. After 40% saturation produced 2,197.00 and 1,192.83 U/mg protein, and yield was 40% with purification 4.54 and 4.1 fold, respectively. This study presents feasibility on ethanol production from cassava pulps pretreated with diluted sulfuric acid by simultaneous saccharification and fermentation （SSF） with S. diastaticus 2047. The results indicated that the culture was able to produce ethanol with high yield without amylolytic enzyme adding by using cassava pulps pretreated with distilled water at 135 ℃ under pressure of 15 lb/inch^2 to produce ethanol yield as high as the cassava pulps pretreated with diluted sulfuric acid under the same condition. This suggests that S diastaticus with enzyme produced has potential for industrial applications.

关键词： Ethanol cassava pulp fermentation amylase.

Bioproduction of Ethanol in Separate Hydrolysis and Fermentation and Simultaneous Saccharification and Fermentation from Cassava Stalks

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Food Science and Engineering 2012年第2期2卷 80-87页

作者： Buddhiporn Sovorawet jirasak Kongkiattikajom School of Bioresources and Technology King Mongkut＇s University of Technology Thonburi Bangkok 10150 Thailand

Cellulose biomass is being investigated as a potential substrate for bioethanol production. Cassava stalks were successfully converted to ethanol by fermentation using Saccharomyces cerevisiae TISTR5048, S. cerevisiae KM1195, S. cerevisiae KM7253 and co-culture of S. cerevisiae TISTR5048 and Candida tropicalis TISTR5045. The objective of this study was to assess the ethanol production from cassava stalks by dilute-acid pretreatment and enzymatic hydrolysis that were convertible into ethanol by mono-culture and co-culture of yeast strain. Cassava stalks 1.5% （w/v） in 0.1 M sulfuric acid was pretreated for 30 min at 135 ℃ under the pressure of 15 lb/inch2. The pretreated cassava stalk suspensions were neutralized to pH 5.5 for saccharification process. The enzyme solution （a-amylase, amyloglucosidase, cellulase, xylanase and pectinase solubilized in buffer pH 5.0） was used for hydrolysis ofpretreated cassava stalk at 50 ℃ for 24 h. The hydrolyaste was supplemented with additional nutrients. The culture was incubated at 30 ℃. The pretreatment of the stalk with dilute-acid resulted sugar yield of 0.57 g/g dry matter from enzymatic hydrolysis, which was higher than dilute-alkaline-pretreated and distilled water-pretreated stalk. The sugar hydrolysate was bioconverted to ethanol with separate hydrolysis and fermentation （SHF） and simultaneous saccharification and fermentation （SSF）. The highest ethanol yields of 98.43% and 95.29% were obtained in SHF and SSF, respectively by S. cerevisiae KM1195. The fermentation time of SSF process was 24-32 h shorter than that of the SHF （= 56 h）, but not significantly leading to difference in ethanol production （5.42 g/L-6.22 g/L for SSF; 5.9 g/L-6.23 g/L for SHF）.

关键词： Ethanol cassava stalk fermentation.

Separated Hydrolysis and Fermentation of Water Hyacinth Leaves for Ethanol Production

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Life Sciences 2011年第3期5卷 212-219页

作者： Buddhiporn Sornvoraweat jirasak Kongkiattikajorn School of Bioresources and Technology King Mongkut＇s University of Technology Thonburi Bangkok 10150 Thailand

Water hyacinth is a raw material for long-term sustainable production of cellulosics ethanol. In this study, the acid pretreatment and enzymatic hydrolysis were used to evaluate to produce more sugar, to be fermented to ethanol. Separated hydrolysis and fermentation （SHF） studies were carried out to produce ethanol from water hyacinth leaves. Dilute sulfuric acid pretreatment and enzymatic hydrolysis were conducted to select the optimum pretreatment conditions. The optimum pretreatment conditions included T = 135 ℃, t = 30 min, and sulfuric acid concentration = 0.1 M. The residue was enzymatically hydrolyzed using the mixture of enzymes cellulase, xylanase and pectinase. The maximum enzymatic saccharification of cellulosic material （76.8%） was achieved. SHF by mono-culture of Saccharomyces cerevisiae KM1195 achieved the highest yields of ethanol. Furthermore, ethanol production was accomplished with the co-culture ofS. cerevisiae TISTR5048 and Candida tropicalis TISTR5045 which produced the highest increase in ethanol Yield. In this case, the ethanol concentration of 3.42 （g/L）, percentage of the theoretical ethanol yield of 99.9%, the ethanol yield of 0.27 g/g and the productivity of 0.22 g/L/h were obtained. This suggested that mild acid pretreatment and co-cultureare promising methods to improve enzymatic hydrolysis and ethanol production from water hyacinth.

关键词： Ethanol water hyacinth leaves fermentation.

Effect of Storage Time and Temperature on Phenolic, Flavonoid Contents and Antioxidant Properties of Milled Rice

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Life Sciences 2011年第6期5卷 447-453页

作者： Pimpaporn Thanajiruschaya Wathinee Doksaku Phanee Rattanachaisit jirasak Kongkiattikajorn Faculty of Science King Mongkut＇s University of Technology Thonburi Bangkok 10150 Thailand School of Bioresources and Technology King Mongkut ＇s University of Technology Thonburi Bangkok 10150 Thailand

The objective of this study was to determine the phenolic, flavonoid contents and amioxidant properties in the milled rice cv. Khaw Dawk Mali 105 during storage for 0-7 months at different temperatures. The total phenolic content of non-stored rice was 17.02 mg/g and 7-month stored rice at 25℃ was 6.07 ＋ 0.01 mg/g while storage for 7 months at 37 ℃, the phenolic contents was 7.29±0.35 mg/g. The total flavonoid content of non-stored rice was 13.26 ± 0.01 mg/g and 7 month stored rice at 25 ℃ was 6.74±0.01 mg/g while storage for 7 months at 37℃, the flavonoid content was 6.45 ± 0.12 mg/g. The antioxidant property determined by 1, 1-diphenyl-2-picrylhydrazyl （DPPH） radical expressed in the value of EC50 （DPPH） of non-stored rice was 0.27 mg/mL and 7-month stored rice at 25℃ was 12.15 mg/mL while storage for 7 months at 37℃, the antioxidant property was 6.34 mg/mL. The antioxidant property determined by lipid peroxidation expressed in the value of EC50 （lipid peroxidation） of non-stored rice was 0.12 mg/mL and 7 month stored rice at 25℃ was 1.18 rag/mL while storage for 7-months at 37 ℃, the antioxidant property was 1.10 mg/mL. The results showed that storage time at 25℃ and 37 ℃ caused decrease of extractable phenolic and flavonoid contents and antioxidant activities of the milled rice however 7-month stored milled rice at 37 ℃ milled rice at 25 ℃.

关键词： Antioxidant phenolic flavonoid rice storage.

Elements and Steps of E-Learning Benchmarking Model for Higher Education Institutions

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Computer and Communications 2014年第2期2卷 37-41页

作者： jirasak Sae-Khow Onjaree Na-Takuatoong Jintavee Khlaisang Division of Educational Communications and Technology Chulalongkorn University Bangkok Thailand. Faculty of Education Suratthani Rajabhat University Suratthani Thailand

The purposes of this research were to 1) develop of an e-learning benchmarking model for higher education institutions;2) analyze and synthesize e-learning indicators for e-learning benchmarking model. The research was conducted using the research and development methods. The result shows that there are eight elements of e-learning benchmarking model: 1) team/staffs 2) benchmarking’s title 3) comparative companies 4) benchmarking indicators 5) data collection method 6) analysis data and results 7) report of results and 8) action plan development. Moreover, four steps of benchmarking model will be used in this research. “Plan” is the step of setting team for benchmarking title and choosing the company to collect the benchmarking while “Do” is a field study in order to analyze and collect each indicator. The step “Check” presents the data to stakeholders and set the purposes of action plan. Finally, “Act” which is the development of action plan leads to the practice or implementation which related to auditing and evaluating.

关键词： e-Learning Benchmarking e-Learning Benchmarking Model