Pub Date : 2018-07-01DOI: 10.22232/stj.2018.06.02.08
Tanushree Das, H. Lalramnghaki, K. Singh
The present study was aimed to study the ultra-structural numerical changes in the microvilli of intestinal mucosal epithelial cells (IMECs) after excessive Zn supplementation in wistar rats. In this study, three groups of rats were fed on an equicaloric sugar and fat rich semi-synthetic diet containing 20mg (control, group-I), 50mg (group-II) and 80mg Zn /kg (group-III) diet respectively for 4 months. The data of the study revealed an increase in surface area of intestinal absorption site through increase in the number and height of microvilli/cell in Zn concentration dependent manner. Further, the result of the study reveals the presence of higher Zn concentrations in IMECs (tissue) and higher absorption rates (HARs) of 14C-glucose (μmoles/g.5min) and amino acids namely 14C-L-alanine and 14C-L-isoleucine (μmoles/g.5min) in group-II and III than that of control group-I. Thus, high Zn supplementation for a longer period of time alters ultrastructure of intestinal mucosal epithelial cell microvilli and increase absorption of nutrients in wistar rats.
本研究旨在研究过量补锌后wistar大鼠肠黏膜上皮细胞(IMECs)微绒毛超微结构数值的变化。在本研究中，三组大鼠分别饲喂含有20mg(对照组，i组)、50mg (ii组)和80mg Zn /kg (iii组)的等量糖和脂肪丰富的半合成饲料，为期4个月。本研究数据显示，肠道吸收部位表面积的增加是通过微绒毛/细胞的数量和高度的增加，并呈锌浓度依赖性。此外，研究结果显示，与对照组相比，ii组和III组的imec(组织)中锌浓度更高，对14c -葡萄糖(μmol /g.5min)和14c - l -丙氨酸和14c - l -异亮氨酸(μmol /g.5min)的吸收率(HARs)更高。由此可见，长时间补充高锌可改变wistar大鼠肠黏膜上皮细胞微绒毛的超微结构，增加营养物质的吸收。
{"title":"Study on Ultra-Structural Numerical Changes in the Intestinal Mucosal Epithelial Cell Microvilli after Excessive Zinc Supplementation in Wistar Rat","authors":"Tanushree Das, H. Lalramnghaki, K. Singh","doi":"10.22232/stj.2018.06.02.08","DOIUrl":"https://doi.org/10.22232/stj.2018.06.02.08","url":null,"abstract":"The present study was aimed to study the ultra-structural numerical changes in the microvilli of intestinal mucosal epithelial cells (IMECs) after excessive Zn supplementation in wistar rats. In this study, three groups of rats were fed on an equicaloric sugar and fat rich semi-synthetic diet containing 20mg (control, group-I), 50mg (group-II) and 80mg Zn /kg (group-III) diet respectively for 4 months. The data of the study revealed an increase in surface area of intestinal absorption site through increase in the number and height of microvilli/cell in Zn concentration dependent manner. Further, the result of the study reveals the presence of higher Zn concentrations in IMECs (tissue) and higher absorption rates (HARs) of 14C-glucose (μmoles/g.5min) and amino acids namely 14C-L-alanine and 14C-L-isoleucine (μmoles/g.5min) in group-II and III than that of control group-I. Thus, high Zn supplementation for a longer period of time alters ultrastructure of intestinal mucosal epithelial cell microvilli and increase absorption of nutrients in wistar rats.","PeriodicalId":22107,"journal":{"name":"Silpakorn University Science and Technology Journal","volume":"222 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75638256","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}
Pub Date : 2018-07-01DOI: 10.22232/stj.2018.06.02.04
L. liana, C. Rao, Goutam Saha
Water management has become an important research area as the scarcity of water increases day-by-day around the world. Rain water harvesting is one of most efficient way of managing water resources which could be utilized for different purposes during the needy period such as drought, drinking water and irrigation. This paper presents a method for identification of suitable dam site using both Multi-Criteria Decision Analysis (AHP) and GIS to establish the hydrological characteristics of suitable region for dam construction. This method considers six (6) criteria such as slope, size of catchment, geology, land use characteristics, proximity to settlement and proximity to river. Each criterion was assigned a weight depending on relative importance with other criteria. Thematic layers were then generated based on these criteria and overlaid in GIS environment to obtain layers identifying the suitable sites for dam construction.
{"title":"Identification of Suitable Dam Site in Tlawng Sub-Watershed using Analytic Hierarchy Process and GIS","authors":"L. liana, C. Rao, Goutam Saha","doi":"10.22232/stj.2018.06.02.04","DOIUrl":"https://doi.org/10.22232/stj.2018.06.02.04","url":null,"abstract":"Water management has become an important research area as the scarcity of water increases day-by-day around the world. Rain water harvesting is one of most efficient way of managing water resources which could be utilized for different purposes during the needy period such as drought, drinking water and irrigation. This paper presents a method for identification of suitable dam site using both Multi-Criteria Decision Analysis (AHP) and GIS to establish the hydrological characteristics of suitable region for dam construction. This method considers six (6) criteria such as slope, size of catchment, geology, land use characteristics, proximity to settlement and proximity to river. Each criterion was assigned a weight depending on relative importance with other criteria. Thematic layers were then generated based on these criteria and overlaid in GIS environment to obtain layers identifying the suitable sites for dam construction.","PeriodicalId":22107,"journal":{"name":"Silpakorn University Science and Technology Journal","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86985215","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}
Pub Date : 2018-07-01DOI: 10.22232/stj.2018.06.02.11
L. liana, C. Rao, Goutam Saha
Dam site selection is an important task in water resource management and it depends on a number of biophysical as well as socio-economic factors. Dam site selection is becoming important research area due to the increase of water scarcity and also to prevent flood in certain area. This paper presents Multi Criteria Decision Making (MCDM) approach in water resources management through the integration of Analytic Hierarchy Process (AHP) and Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS). These methods were applied for identification of suitable dam site in Tlawng sub-basin. The influential criteria for dam site selection were initially identified through literature review and experts opinion which was followed by the selection of four (4) feasible sites after having studied Tlawng watershed. Lastly, AHP and TOPSIS were applied to determine the relative weight and rank respectively.
{"title":"Integrated Approach using AHP and TOPSIS for Dam Site Selection","authors":"L. liana, C. Rao, Goutam Saha","doi":"10.22232/stj.2018.06.02.11","DOIUrl":"https://doi.org/10.22232/stj.2018.06.02.11","url":null,"abstract":"Dam site selection is an important task in water resource management and it depends on a number of biophysical as well as socio-economic factors. Dam site selection is becoming important research area due to the increase of water scarcity and also to prevent flood in certain area. This paper presents Multi Criteria Decision Making (MCDM) approach in water resources management through the integration of Analytic Hierarchy Process (AHP) and Technique for Order of Preference by Similarity to Ideal Solution (TOPSIS). These methods were applied for identification of suitable dam site in Tlawng sub-basin. The influential criteria for dam site selection were initially identified through literature review and experts opinion which was followed by the selection of four (4) feasible sites after having studied Tlawng watershed. Lastly, AHP and TOPSIS were applied to determine the relative weight and rank respectively.","PeriodicalId":22107,"journal":{"name":"Silpakorn University Science and Technology Journal","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89044567","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}
Pub Date : 2018-07-01DOI: 10.22232/stj.2018.06.02.09
Wa tila, L. R
The current study was aimed to identify the phytochemicals and determine the in vitro antioxidant activity of the methanolic leaves extract of Alternanthera philoxeroides (Mart.) Griseb (MEAP) from Mizoram, India. A. philoxeroides (Amaranthaceae) is an aquatic plant commonly called Alligator weed. Reported pharmacological activities of the plant include antiviral, antinociceptive and antihyperglycaemic activities. Successive extraction was carried out using Soxhlet apparatus with solvents of increasing polarities (Petroleum ether, Chloroform, Methanol). Phytochemical screening of the methanolic leaves extract and in vitro antioxidant activity was determined by DPPH assay, reducing power and hydroxyl radical scavenging assay. The extract revealed the presence of glycosides, carbohydrates, flavonoids, steroids, triterpenoids, inulin and saponins. The extract exhibited Ic50 values of 87.06 µg/mL and 89.75 µg/mL for DPPH and hydroxyl radical scavenging respectively. The plant extract also exhibited concentration-dependent reducing activity. The results from the experiment suggest that the plant under study, possess antioxidant activity and can be opted as a promising source of natural antioxidant compound.
{"title":"Qualitative Phytochemical Analysis and In-Vitro Antioxidant Evaluation of Alternanthera philoxeroides (Mart.) Griseb from Mizoram, Northeast, India","authors":"Wa tila, L. R","doi":"10.22232/stj.2018.06.02.09","DOIUrl":"https://doi.org/10.22232/stj.2018.06.02.09","url":null,"abstract":"The current study was aimed to identify the phytochemicals and determine the in vitro antioxidant activity of the methanolic leaves extract of Alternanthera philoxeroides (Mart.) Griseb (MEAP) from Mizoram, India. A. philoxeroides (Amaranthaceae) is an aquatic plant commonly called Alligator weed. Reported pharmacological activities of the plant include antiviral, antinociceptive and antihyperglycaemic activities. Successive extraction was carried out using Soxhlet apparatus with solvents of increasing polarities (Petroleum ether, Chloroform, Methanol). Phytochemical screening of the methanolic leaves extract and in vitro antioxidant activity was determined by DPPH assay, reducing power and hydroxyl radical scavenging assay. The extract revealed the presence of glycosides, carbohydrates, flavonoids, steroids, triterpenoids, inulin and saponins. The extract exhibited Ic50 values of 87.06 µg/mL and 89.75 µg/mL for DPPH and hydroxyl radical scavenging respectively. The plant extract also exhibited concentration-dependent reducing activity. The results from the experiment suggest that the plant under study, possess antioxidant activity and can be opted as a promising source of natural antioxidant compound.","PeriodicalId":22107,"journal":{"name":"Silpakorn University Science and Technology Journal","volume":"75 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86416138","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}
In this study, the life cycle cost (LCC) and energy consumption of a residential home were evaluated to find the lowest LCC among 12 roof systems. EnergyPlus 8.3 program was employed to estimate the annual cooling requirements of a two-storey house with total area of 240m 2 . The analysis was carried out for four types of roof insulation (aluminum foil, fiberglass, polystyrene and polyurethane)and three types of roof tires (concrete, ceramic and fiber cement).The concrete roof tiles without insulation were set as the baseline case. Results show the concrete roof tiles with fiberglass insulation provide the highest energy saving in the air conditioning system at 10.98%. However, the roof using fiber cement roof tiles with polystyrene insulation was found to be the most cost effective roof system. It shows the lowest LCC with the reduction in LCC by 3.31%.
{"title":"Life Cycle Cost and Energy Analysis of Roof Systems for a Single-Family House","authors":"Vichuda Mettanant, Chanikan Boonthep, Vipada Jaroenrat","doi":"10.14456/SUSTJ.2016.15","DOIUrl":"https://doi.org/10.14456/SUSTJ.2016.15","url":null,"abstract":"In this study, the life cycle cost (LCC) and energy consumption of a residential home were evaluated to find the lowest LCC among 12 roof systems. EnergyPlus 8.3 program was employed to estimate the annual cooling requirements of a two-storey house with total area of 240m 2 . The analysis was carried out for four types of roof insulation (aluminum foil, fiberglass, polystyrene and polyurethane)and three types of roof tires (concrete, ceramic and fiber cement).The concrete roof tiles without insulation were set as the baseline case. Results show the concrete roof tiles with fiberglass insulation provide the highest energy saving in the air conditioning system at 10.98%. However, the roof using fiber cement roof tiles with polystyrene insulation was found to be the most cost effective roof system. It shows the lowest LCC with the reduction in LCC by 3.31%.","PeriodicalId":22107,"journal":{"name":"Silpakorn University Science and Technology Journal","volume":"70 1","pages":"28-33"},"PeriodicalIF":0.0,"publicationDate":"2016-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80398525","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}
Kritsada On-ai, N. Kammuang-lue, P. Sakulchangsatjatai, P. Terdtoon
The objective of this paper is to qualitatively study the effect of centrifugal acceleration on heat transfer characteristic of a rotating closed-loop pulsating heat pipe (RCLPHP). RCLPHP can be applied to cool rotating devices, such as disc brake or steam turbine. It improves the lifetime and reduces the wear of the device. In recent studies, effects of several parameters on thermal performanceof CLPHP have been investigatede.g. inner diameter, length of evaporator section, meandering of turn and working fluid. Some researchersderivedthese parameters in dimensionless form, and then established correlation to predict thermal performance of CLPHP at specified inclination angles. Another parameter that affects rotating or moving heat pipe is centrifugal acceleration. The induced internal centrifugal acceleration of the RCLPHP affects the circulation of working fluid. When flow direction of condensate is in the same direction as the acceleration,the centrifugal acceleration is defined to be positive. In turn,thecondensate is in thecounter-flow direction to the acceleration, if centrifugal acceleration is negative. This acceleration affectsthe circulation of liquid phase. Because of heavier mass of the liquid, most of itaccumulatedat the end part of evaporator section. When the RCLPHPis heated, working fluid in this section changes from liquid to vapor phase. Then it circulates to condenser section, or another end, and condensed. When centrifugal acceleration is increased, thermal resistance decreases. The condensate can quickly circulate to evaporation sectionbecause working fluid velocityis higher than those at lower acceleration. In the future, researches to quantitatively study on the effects of centrifugal and parameters which related to the thermal performance of RCLPHP will be further conducted.
{"title":"Effect of Centrifugal Acceleration on Heat Transfer Characteristics of Rotating Closed-Loop Pulsating Heat Pipes","authors":"Kritsada On-ai, N. Kammuang-lue, P. Sakulchangsatjatai, P. Terdtoon","doi":"10.14456/SUSTJ.2016.13","DOIUrl":"https://doi.org/10.14456/SUSTJ.2016.13","url":null,"abstract":"The objective of this paper is to qualitatively study the effect of centrifugal acceleration on heat transfer characteristic of a rotating closed-loop pulsating heat pipe (RCLPHP). RCLPHP can be applied to cool rotating devices, such as disc brake or steam turbine. It improves the lifetime and reduces the wear of the device. In recent studies, effects of several parameters on thermal performanceof CLPHP have been investigatede.g. inner diameter, length of evaporator section, meandering of turn and working fluid. Some researchersderivedthese parameters in dimensionless form, and then established correlation to predict thermal performance of CLPHP at specified inclination angles. Another parameter that affects rotating or moving heat pipe is centrifugal acceleration. The induced internal centrifugal acceleration of the RCLPHP affects the circulation of working fluid. When flow direction of condensate is in the same direction as the acceleration,the centrifugal acceleration is defined to be positive. In turn,thecondensate is in thecounter-flow direction to the acceleration, if centrifugal acceleration is negative. This acceleration affectsthe circulation of liquid phase. Because of heavier mass of the liquid, most of itaccumulatedat the end part of evaporator section. When the RCLPHPis heated, working fluid in this section changes from liquid to vapor phase. Then it circulates to condenser section, or another end, and condensed. When centrifugal acceleration is increased, thermal resistance decreases. The condensate can quickly circulate to evaporation sectionbecause working fluid velocityis higher than those at lower acceleration. In the future, researches to quantitatively study on the effects of centrifugal and parameters which related to the thermal performance of RCLPHP will be further conducted.","PeriodicalId":22107,"journal":{"name":"Silpakorn University Science and Technology Journal","volume":"16 1","pages":"15-22"},"PeriodicalIF":0.0,"publicationDate":"2016-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87414635","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}
The effects of defatted rice bran (DRB) as a filler for cellular natural rubber (NR) vulcanizate on its cell morphology, water absorption and mechanical properties were investigated. The properties of the DRB-filled cellular NR vulcanizate were also compared with clay-filled and CaCO 3 -filled cellular NR vulcanizates at similar loading level (30 parts per hundred of rubber). Scanning electron micrographs revealed that the greater cell size was observed when cellular NR vulcanizates were filled with all types of filler. The DRB-filled cellular NR vulcanizate exhibited better and more uniform dispersion of cellular cell structure as compared to CaCO 3 -filled and Clay-filled cellular NR vulcanizates.Moreover,the DRB-filled cellular NR vulcanizate gave the highest water absorption value, tensile strength and 100%modulus as compared to CaCO 3 -filled and Clay-filled cellular NR vulcanizates. The elongation at break of DRB-filled cellular NR vulcanizate was found to be comparable to that of CaCO 3 -filled cellular NR vulcanizate . However, the cellular NR vulcanizate filled with DRB showed the lowest hardness value.According to these observations, DRB can potentially be used as acheap and more environment-friendly natural filler for cellular natural rubber.
{"title":"Effect of Defatted Rice Bran, Calcium Carbonate and Clay on Properties of Cellular Natural Rubber","authors":"Darinya Moonchai, Pattaporn Juntamui, Rungtiwa Ruankum","doi":"10.14456/SUSTJ.2016.12","DOIUrl":"https://doi.org/10.14456/SUSTJ.2016.12","url":null,"abstract":"The effects of defatted rice bran (DRB) as a filler for cellular natural rubber (NR) vulcanizate on its cell morphology, water absorption and mechanical properties were investigated. The properties of the DRB-filled cellular NR vulcanizate were also compared with clay-filled and CaCO 3 -filled cellular NR vulcanizates at similar loading level (30 parts per hundred of rubber). Scanning electron micrographs revealed that the greater cell size was observed when cellular NR vulcanizates were filled with all types of filler. The DRB-filled cellular NR vulcanizate exhibited better and more uniform dispersion of cellular cell structure as compared to CaCO 3 -filled and Clay-filled cellular NR vulcanizates.Moreover,the DRB-filled cellular NR vulcanizate gave the highest water absorption value, tensile strength and 100%modulus as compared to CaCO 3 -filled and Clay-filled cellular NR vulcanizates. The elongation at break of DRB-filled cellular NR vulcanizate was found to be comparable to that of CaCO 3 -filled cellular NR vulcanizate . However, the cellular NR vulcanizate filled with DRB showed the lowest hardness value.According to these observations, DRB can potentially be used as acheap and more environment-friendly natural filler for cellular natural rubber.","PeriodicalId":22107,"journal":{"name":"Silpakorn University Science and Technology Journal","volume":"81 1","pages":"10-14"},"PeriodicalIF":0.0,"publicationDate":"2016-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90980807","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}
P. Yeunyongkul, Passawat Watcharadumrongsak, S. Rittidech
The aim of this research is to experimentally investigate the application of a hybrid condenser as the condenser for a vapor compression refrigeration system. Split type air conditioner for residential use has two major disadvantages. First, it has a large pressure drop in the condenser caused by the flow of refrigerant inside a small tube which affects compressor power. Second, a large amount of heat is rejected to the surroundings since the refrigerant has to condense after passing through the condenser. To decrease pressure drop and recover heat rejection from the condensing process, this study considered using hybrid condenser instead of the conventional condenser in the split type air conditioner. The refrigeration capacity was set at 12,500 Btu/h (3.663 kW) with R22 as the refrigerant. The optimum size of the thermosyphon with water as the working fluid consists of 0.1 meter of evaporator section length, 0.1 meter of condenser section length, the thermosyphon with an inner diameter of 6.5 millimeter, and 105 tubes. Therefore, these sizes were selected to construct the hybrid condenser. The experimental results were obtained and compared with the conventional condenser. It was found that temperature difference between ambient and room of the conventional condenser system was 11.5 oC. While thetemperature difference of the hybrid condenser system with water flow rate of 4, 6 and 8 LPM were 15.9, 16.6 and 17.3 oC, respectively. In addition, electric power consumptionof the conventional condenser system was 1,423 W. While theelectric power consumption of the hybrid condenser system with water flow rate of 4, 6 and 8 LPM were 1,315, 1,309 and 1,295 W, respectively. When both systems were compared with the same heat load, it was found that the electric power consumptionof the hybrid condenser system of 4, 6 and 8 LPM were decreased by about 8.2, 8.7 and 9.9%,respectively. Finally, the outlet temperature of the cooling water which recovers heat from the condenser section of the hybrid condenser with the water flow rate of 4, 6 and 8 LPM were 6.6, 8.2 and 9.8oC, respectively.
{"title":"Hybrid condenser for split type air conditioner","authors":"P. Yeunyongkul, Passawat Watcharadumrongsak, S. Rittidech","doi":"10.14456/SUSTJ.2016.14","DOIUrl":"https://doi.org/10.14456/SUSTJ.2016.14","url":null,"abstract":"The aim of this research is to experimentally investigate the application of a hybrid condenser as the condenser for a vapor compression refrigeration system. Split type air conditioner for residential use has two major disadvantages. First, it has a large pressure drop in the condenser caused by the flow of refrigerant inside a small tube which affects compressor power. Second, a large amount of heat is rejected to the surroundings since the refrigerant has to condense after passing through the condenser. To decrease pressure drop and recover heat rejection from the condensing process, this study considered using hybrid condenser instead of the conventional condenser in the split type air conditioner. The refrigeration capacity was set at 12,500 Btu/h (3.663 kW) with R22 as the refrigerant. The optimum size of the thermosyphon with water as the working fluid consists of 0.1 meter of evaporator section length, 0.1 meter of condenser section length, the thermosyphon with an inner diameter of 6.5 millimeter, and 105 tubes. Therefore, these sizes were selected to construct the hybrid condenser. The experimental results were obtained and compared with the conventional condenser. It was found that temperature difference between ambient and room of the conventional condenser system was 11.5 oC. While thetemperature difference of the hybrid condenser system with water flow rate of 4, 6 and 8 LPM were 15.9, 16.6 and 17.3 oC, respectively. In addition, electric power consumptionof the conventional condenser system was 1,423 W. While theelectric power consumption of the hybrid condenser system with water flow rate of 4, 6 and 8 LPM were 1,315, 1,309 and 1,295 W, respectively. When both systems were compared with the same heat load, it was found that the electric power consumptionof the hybrid condenser system of 4, 6 and 8 LPM were decreased by about 8.2, 8.7 and 9.9%,respectively. Finally, the outlet temperature of the cooling water which recovers heat from the condenser section of the hybrid condenser with the water flow rate of 4, 6 and 8 LPM were 6.6, 8.2 and 9.8oC, respectively.","PeriodicalId":22107,"journal":{"name":"Silpakorn University Science and Technology Journal","volume":"141 1","pages":"23-27"},"PeriodicalIF":0.0,"publicationDate":"2016-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77114956","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}
M. A. Sobahan, Nasima Akter, Y. Murata, S. Munemasa
Exogenous application of proline and glycinebetaine (hereafter betaine) is often regarded as a shotgun approach for the protection and survival of plants under abiotic stresses including salinity. Here, we investigated effects of proline and betaine on hydrogen peroxide (H 2 O 2 ), malondialdehyde (MDA) and transpiration rate in salt-stressed rice plants. Generally, salt stress increased H 2 O 2 and lipid peroxidation as indicated by MDA content and decreased transpiration rate in rice plants. The exogenous application of proline and betaine decrease H 2 O 2 and MDA contents and increase transpiration rate in salt-stressed rice plants. It is suggested that exogenous proline and betaine mitigate the detrimental effects of salt stress by reducing H 2 O 2 and lipid peroxidation levels and by increasing transpiration rate in rice plants.
{"title":"Exogenous Proline and Glycinebetaine Mitigate the Detrimental Effect of Salt Stress on Rice Plants","authors":"M. A. Sobahan, Nasima Akter, Y. Murata, S. Munemasa","doi":"10.14456/SUSTJ.2016.11","DOIUrl":"https://doi.org/10.14456/SUSTJ.2016.11","url":null,"abstract":"Exogenous application of proline and glycinebetaine (hereafter betaine) is often regarded as a shotgun approach for the protection and survival of plants under abiotic stresses including salinity. Here, we investigated effects of proline and betaine on hydrogen peroxide (H 2 O 2 ), malondialdehyde (MDA) and transpiration rate in salt-stressed rice plants. Generally, salt stress increased H 2 O 2 and lipid peroxidation as indicated by MDA content and decreased transpiration rate in rice plants. The exogenous application of proline and betaine decrease H 2 O 2 and MDA contents and increase transpiration rate in salt-stressed rice plants. It is suggested that exogenous proline and betaine mitigate the detrimental effects of salt stress by reducing H 2 O 2 and lipid peroxidation levels and by increasing transpiration rate in rice plants.","PeriodicalId":22107,"journal":{"name":"Silpakorn University Science and Technology Journal","volume":"6 1","pages":"38-43"},"PeriodicalIF":0.0,"publicationDate":"2016-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90249201","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}
A. Choudhary, S. Tiwari, S. K. Jadhav, K. L. Tiwari
Bioethanol is a viable alternative to fossil fuels. It is an alcohol fermented from sugars, starches or from cellulosic biomass. Bioethanol is a renewable liquid fuel for motor vehicles because it displaces the use of fossil fuels by recycling the carbon dioxide that is released when it is combusted as fuel. The objective of the work is to produce bioethanol from Shorea robusta (Sal) seeds using Zymomonas mobilis MTCC92. The effects of incubation period, temperature, pH and nutrients were evaluated. It was found that after 72 hours of fermentation at temperature 37°C, pH 4 the production of bioethanol was enhanced and addition of sulphur and phosphorus supported the bioethanol production.
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