International Journal of Science and Engineering最新文献_第9页

Synthesis Biodiesel from Palm Oil Through Interesterification Using Imobilized Lipase Enzym as Catalyst: The Effect of Amount of Biocatalyst, Mole Ratio of Reactan, Temperature to Yield 固定化脂肪酶催化棕榈油酯化合成生物柴油:生物催化剂用量、反应物摩尔比、温度对产率的影响

International Journal of Science and Engineering Pub Date : 2014-10-15 DOI: 10.12777/IJSE.7.2.174-177

Melina Widyawati, R. Manurung, Ricky Afrianto

引用次数: 1

Taro Tube Flour Modification via Hydrogen Peroxide Oxidation 过氧化氢法改性芋头管面粉

International Journal of Science and Engineering Pub Date : 2014-10-15 DOI: 10.12777/IJSE.7.2.137-142

C. S. Budiyati, D. Ariyanti

引用次数: 4

Soil Erosion Assessment of The Post-Coal Mining Site in Kutai Kartanagera District, East Kalimantan Province 东加里曼丹省Kutai Kartanagera地区煤矿开采后场地土壤侵蚀评价

International Journal of Science and Engineering Pub Date : 2014-10-15 DOI: 10.12777/ijse.7.2.130-136

Z. Zulkarnain

{"title":"Soil Erosion Assessment of The Post-Coal Mining Site in Kutai Kartanagera District, East Kalimantan Province","authors":"Z. Zulkarnain","doi":"10.12777/ijse.7.2.130-136","DOIUrl":"https://doi.org/10.12777/ijse.7.2.130-136","url":null,"abstract":"Besides of its positive economic impact, mining activity has negative impacts to the sustainability of community development and livelihoods as mining reclamation can’t restore the land condition to its original state. The objective of this study was to determine the main factor that caused soil erosion induced in post-coal mining and defined reclamation activity that caused soil erosion. The observed parameters were site reclamation age of each companies, soil physical properties (density, texture, permeability, organic material and soil structure), rainfall rate, soil chemical properties, land cover and age of re-vegetation, plant cover. Analysis was carried out to determine the magnitude of erosion at each site unit, tolerable erosion and potential erosion level. Adequate reclamation action with good vegetative cover could be seen from erosion magnitude at five year reclamation age i.e. 1.7 ton/ha/ year - which lower than tolerable erosion i.e. 5.4 ton/ha/year. While inadequate reclamation action could be seen from erosion magnitude at nine year age of reclamation i.e. 201.1 ton/ha/year 1 which higher than tolerable erosion i.e. 15.1 ton/ha/ year 1 . The erosion magnitude at the four month of reclamation age was 4.966,3 ton/ha with tolerable erosion was 5.3 ton/ha. The erosion magnitude that occurs in post-mining site was due to soil compaction that lowering soil permeability rate leading to slow growing of cover crop. This condition made the soil wasn’t covered from raindrop and water run-off. In order to improve the soil condition of post-mining site into productive land, legume cover crop was recommended to be planted.","PeriodicalId":14209,"journal":{"name":"International Journal of Science and Engineering","volume":"7 1","pages":"130-136"},"PeriodicalIF":0.0,"publicationDate":"2014-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.12777/ijse.7.2.130-136","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66729291","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

INVESTIGATION ON THE EFFECT OF SHAPES ON THE DRYING KINETICS AND SENSORY EVALUATION STUDY OF DRIED JACKFRUIT 形状对菠萝蜜干燥动力学的影响及感官评价研究

International Journal of Science and Engineering Pub Date : 2014-10-15 DOI: 10.12777/IJSE.7.2.193-198

P. L. Gan, P. E. Poh

{"title":"INVESTIGATION ON THE EFFECT OF SHAPES ON THE DRYING KINETICS AND SENSORY EVALUATION STUDY OF DRIED JACKFRUIT","authors":"P. L. Gan, P. E. Poh","doi":"10.12777/IJSE.7.2.193-198","DOIUrl":"https://doi.org/10.12777/IJSE.7.2.193-198","url":null,"abstract":"Jackfruits are seasonal and highly nutritional fruits indigenous to the Southwestern rainforests of India. However much of the produce are spoilt annually due to poor preservation techniques. Minimal studies have been conducted on the drying kinetics of jackfruit and the effect of shapes on the drying kinetics. In this research, drying curves of three different shaped jackfruit slices were obtained using a convective oven at 40 o C, 50 o C, 60 o C and 70 o C. Modified Midilli-Kucuk Model was found to be the best kinetic model for drying of jackfruits. At all temperatures, effective moisture diffusivity values and activation energy varied from 2.66 x 10 -10 - 4.85 x 10 -10 m 2 /s and 16.08 - 20.07 kJ/mol respectively. Drying was found to be most efficient at 50 o C using the square shaped slices with a R 2 , RMSE and SSE value of 0.9984, 0.01127 and 0.002668 respectively. Sensory evaluation of untreated and additive-added dried jackfruit slices was conducted by 40 untrained sensory panelists. Jackfruit with ascorbic acid and sugar coating had highest aesthetics value due to better retention of colour by ascorbic acid. However sugar coated jackfruit had the most favorable taste and smell. Further optimization must be done to satisfy consumers collectively to enable a highly marketable product.","PeriodicalId":14209,"journal":{"name":"International Journal of Science and Engineering","volume":"7 1","pages":"193-198"},"PeriodicalIF":0.0,"publicationDate":"2014-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.12777/IJSE.7.2.193-198","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66730067","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 24

PHYSIOCHEMICAL ASSESSMENT OF LANDFILL GENERATED LEACHATES IN LAGOS, NIGERIA 尼日利亚拉各斯垃圾填埋场产生的渗滤液的理化评价

International Journal of Science and Engineering Pub Date : 2014-10-15 DOI: 10.12777/IJSE.7.2.113-123

C. N. Akujieze, I. Idehai

{"title":"PHYSIOCHEMICAL ASSESSMENT OF LANDFILL GENERATED LEACHATES IN LAGOS, NIGERIA","authors":"C. N. Akujieze, I. Idehai","doi":"10.12777/IJSE.7.2.113-123","DOIUrl":"https://doi.org/10.12777/IJSE.7.2.113-123","url":null,"abstract":"About 3.5 million tonnes of comingled municipal solid wastes (MSW) are dumped annually into the landfill areas of Lagos in Nigeria with a human population of about 21 million. Upon geo-bio-chemical processes, leachates are produced which are improperly collected and may be introduced to the environment with possible insidious effects on human health. Eight (8) composite leachates samples were collected from four (4) landfills in the megacity and tested for their physiochemical parameters in order to determine their suitability for discharge into agricultural soils and groundwater systems. Geological site investigation reveal that the landfills except Epe have significant attenuative clayey soil protection above groundwater, and can adsorb and/ or precipitate contaminants/ pollutants within its mass. Using ANOVA, juxtapositions of the F calculated with the F critical values revealed a metal sequence of : Hg > Zn >As >Mn >Ni >K >Pb >Cr>Cd>Fe. Also, total alkalinity> total hardness> total acidity. All the measured anions had F calculated above F critical values and were in the hierarchy : Chloride> sulphate> phosphate>nitrate.. Mean concentrations were in the order : Fe>Cd>Cr>Pb>K>Ni=Mn>As>Zn>Hg. Fe also posted the highest value for standard deviation. Results of the ratios of the standard deviation to the means were in the sequence: Fe> Zn>K> Ni > Mn>Pb> Cr> Cd> Hg> As. The presence of arsenic above prescribed limits in the Epe leachate is a major concern because the lithology is sandy, and has a reported depth of about 3m to the unconfined aquifer that adjoins the Epe Lagoon. This expansive landfill is recommended for closure.","PeriodicalId":14209,"journal":{"name":"International Journal of Science and Engineering","volume":"7 1","pages":"113-123"},"PeriodicalIF":0.0,"publicationDate":"2014-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.12777/IJSE.7.2.113-123","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66727982","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

THE EFFECT OF Fe-ENRICH PHASE ON THE PITTING CORROSION RESISTANCE OF Al ALLOY IN VARIOUS NEUTRAL SODIUM CHLORIDE SOLUTIONS 富铁相对铝合金在各种中性氯化钠溶液中抗点蚀性能的影响

International Journal of Science and Engineering Pub Date : 2014-10-15 DOI: 10.12777/IJSE.7.2.143-149

G. Priyotomo, I. Astawa

引用次数: 0

Experimental Design of Electrocoagulation and Magnetic Technology for Enhancing Suspended Solids Removal from Synthetic Wastewater 电絮凝与磁法强化合成废水中悬浮物去除的实验设计

International Journal of Science and Engineering Pub Date : 2014-10-15 DOI: 10.12777/IJSE.7.2.178-192

M. F. Ni’am, F. Othman

{"title":"Experimental Design of Electrocoagulation and Magnetic Technology for Enhancing Suspended Solids Removal from Synthetic Wastewater","authors":"M. F. Ni’am, F. Othman","doi":"10.12777/IJSE.7.2.178-192","DOIUrl":"https://doi.org/10.12777/IJSE.7.2.178-192","url":null,"abstract":"Design of experiments (DOE) is one of the statistical method that is used as a tool to enhance and improve experimental quality. The changes to the variables of a process or system is supposed to give the optimal result (response) and quite satisfactory. Experimental design can defined as a test or series of test series by varying the input variables (factors) of a process that can known to cause changes in output (response). This paper presents the results of experimental design of wastewater treatment by electrocoagulation (EC) technique. A combined magnet and electrocoagulation (EC) technology were designed to increase settling velocity and to enhance suspended solid removal efficiencies from wastewater samples. In this experiment, a synthetic wastewater samples were prepared by mixing 700 mg of the milk powder in one litre of water and treated by using an acidic buffer solution. The monopolar iron (Fe) plate anodes and cathodes were employed as electrodes. Direct current was varied in a range of between 0.5 and 1.1 A, and flowrate in a range of between 1.00 to 3.50 mL/s. One permanent magnets namely AlNiCo with a magnetic strength of 0.16T was used in this experiment. The results show that the magnetic field and the flowrate have major influences on suspended solids removal. The efficiency removals of suspended solids, turbidity and COD removal efficiencies at optimum conditions were found to be more than 85%, 95%, and 75%, respectively.","PeriodicalId":14209,"journal":{"name":"International Journal of Science and Engineering","volume":"7 1","pages":"178-192"},"PeriodicalIF":0.0,"publicationDate":"2014-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.12777/IJSE.7.2.178-192","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66730013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 12

Drying of Rosella (Hibiscus sabdariffa) Flower Petals using Solar Dryer with Double Glass Cover Collector 双玻璃罩太阳能干燥器对玫瑰花花瓣的干燥研究

International Journal of Science and Engineering Pub Date : 2014-10-14 DOI: 10.12777/ijse.7.2.150-154

T. Marnoto

{"title":"Drying of Rosella (Hibiscus sabdariffa) Flower Petals using Solar Dryer with Double Glass Cover Collector","authors":"T. Marnoto","doi":"10.12777/ijse.7.2.150-154","DOIUrl":"https://doi.org/10.12777/ijse.7.2.150-154","url":null,"abstract":"Chemical ingredients in rosella petals are very beneficial for health. Rosella petals needed to be drained for storage and packing purpose. The traditional drying takes 5 days and less healthy. Solar dryer technology can speed up the drying process and protect materials from dust contamination. Solar dryer with double glass covered collector has been designed and made for drying of agricultural products such as rosella flowers. Rosella petals as much as 2300 grams with initial moisture content of 90.84 % be dried with this dryer until the moisture content of 7.67 % takes only 2 days, although the weather was less sunny . The temperature in the drying chamber was not more than 50° C, so it was good for drying groceries, not damaging chemical ingredients. The relative humidity in the space dryeris was about 40 % and it was still relative low. Drying rate and drying performance was expressed by the efficiency and Specific Moisture Evaporation Rate ( SMER ) were influenced by water content of the dried material and weather. Daily efficiency at the first and the second day: 14.931 % and 5.78%, while the daily SMER on the first and the second day: 0.222 and 0.0256 ( kg / kWh ).","PeriodicalId":14209,"journal":{"name":"International Journal of Science and Engineering","volume":"38 1","pages":"150-154"},"PeriodicalIF":0.0,"publicationDate":"2014-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.12777/ijse.7.2.150-154","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66729684","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 11

The Study of Thermal Performance of Roof and the Impact of Indoor Conditions on Thermal Environment in Changhua County Fang Yuan Elementary Classrooms 彰化县方圆小学教室屋面热工性能及室内条件对热环境的影响研究

International Journal of Science and Engineering Pub Date : 2014-09-01 DOI: 10.6159/IJSE.2014.(4-3).04

陳瀅世, 洪晟育

{"title":"The Study of Thermal Performance of Roof and the Impact of Indoor Conditions on Thermal Environment in Changhua County Fang Yuan Elementary Classrooms","authors":"陳瀅世, 洪晟育","doi":"10.6159/IJSE.2014.(4-3).04","DOIUrl":"https://doi.org/10.6159/IJSE.2014.(4-3).04","url":null,"abstract":"Because of making a more comfortable and convenient life, human beings have already consumed alarge number of natural resources since the Industrial Revolution. In order to support the quality of life, people need to use more energy than ever. People create more greenhouse gas when they use more energy. That will speed up the climate change. It is important to reduce emissions of carbon dioxide for retarding greenhouse effect. Buildings consume a high proportion of energy for air-conditioner and lights. Building envelope can reduce heat gain of a building, so thermal performance of building envelope is crucial factor for keeping indoor thermal environment comfortable. Because the roof can receive a lot of heat energy from the sun, the roof insulation is an important issue to study. There are two objectives in this study. The first objective of this study is to investigate the thermal performance of classrooms' roofs in Changhua County Fang Yuan elementary school during winter and summer by using infrared thermography. Infrared thermography is a fast and non-contact method to detect temperature distributions on the surface. According to thermal images of two classrooms with different designs of roof, we discover the roof with passive cooling designs by adopting EPS, trellis, ventilated layer and roof greenery has better thermal performance. The second objective is to evaluate the impact of different indoor conditions (temperature of internal surface of roof, numbers of open window, etc.) on the indoor thermal environment of the library. We analyze the data by using stepwise multiple regression method. According to the result of analysis, we find that ＂adequate open windows＂ and ＂temperature of internal surface of roof＂ can effect the indoor thermal environment significantly. In summary, the roof insulation and natural ventilation are important to indoor climate.","PeriodicalId":14209,"journal":{"name":"International Journal of Science and Engineering","volume":"4 1","pages":"33-48"},"PeriodicalIF":0.0,"publicationDate":"2014-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"71315647","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Delay-Dependant Stability of Chaotic Systems with Exponential Synchronization 指数同步混沌系统的时滞相关稳定性

International Journal of Science and Engineering Pub Date : 2014-09-01 DOI: 10.6159/IJSE.2014.(4-3).01

F. Hsiao

引用次数: 0