W. Khairul, M. Shariff, R. Rahamathullah, A. Daud, M. Shamsuddin, S. K. C. Soh
The synthesis and utilization of C-C bonds formatio n are concerned about the key steps for the buildin g of several conducting molecular electronics involving many asy mmetric catalysts approached, which is an essential task that most researchers would ignore in preparing these materia ls to enhance the production yield of cross-couplin g materials. Despite the enormous progress, there still remains great demand for economic and practicable cross-c upling processes involving ultra-low catalyst loadings wit h high turnover numbers due to the employment of co nventional metal catalyst. Thus, there has been an excessive i nterest to cultivate non-phosphine palladium cataly s s for excellent achievement of activity, stability, and substrate t olerance which permit the coupling reactions to be conducted under mild reaction condition at ambient atmosphere. In t his contribution, N-(4-nitrophenylcarbamothioyl)-N’ -(4methylbenzoyl) thiourea ( LT1 ) and its metal complex of MLT1 featuring Pd (II) have been successfully character ised via typical spectroscopic methods namely; Infrared (IR) spectroscopy, Ultraviolet-visible (UV-Vis) spe ctroscopy, CHNS elemental analysis, and Nuclear Magnetic Reson ance ( H and C NMR). In turn, catalytic studies of palladium catalyst ( MLT1 ) were tested for its homogenous catalytic activity in Heck cross-coupling reaction. The reaction was monitored by Gas Chromatography-Flame Ionisation De tector (GC-FID). Results reveal that MLT1 exhibits 100% of conversion starting material into a cross-coupling product, which was alkene-based compound.
{"title":"An Efficient Palladium-Thiourea Catalysed Heck Cross-Coupling Reaction for Molecular Electronic Interest","authors":"W. Khairul, M. Shariff, R. Rahamathullah, A. Daud, M. Shamsuddin, S. K. C. Soh","doi":"10.7454/MST.V21I2.3081","DOIUrl":"https://doi.org/10.7454/MST.V21I2.3081","url":null,"abstract":"The synthesis and utilization of C-C bonds formatio n are concerned about the key steps for the buildin g of several conducting molecular electronics involving many asy mmetric catalysts approached, which is an essential task that most researchers would ignore in preparing these materia ls to enhance the production yield of cross-couplin g materials. Despite the enormous progress, there still remains great demand for economic and practicable cross-c upling processes involving ultra-low catalyst loadings wit h high turnover numbers due to the employment of co nventional metal catalyst. Thus, there has been an excessive i nterest to cultivate non-phosphine palladium cataly s s for excellent achievement of activity, stability, and substrate t olerance which permit the coupling reactions to be conducted under mild reaction condition at ambient atmosphere. In t his contribution, N-(4-nitrophenylcarbamothioyl)-N’ -(4methylbenzoyl) thiourea ( LT1 ) and its metal complex of MLT1 featuring Pd (II) have been successfully character ised via typical spectroscopic methods namely; Infrared (IR) spectroscopy, Ultraviolet-visible (UV-Vis) spe ctroscopy, CHNS elemental analysis, and Nuclear Magnetic Reson ance ( H and C NMR). In turn, catalytic studies of palladium catalyst ( MLT1 ) were tested for its homogenous catalytic activity in Heck cross-coupling reaction. The reaction was monitored by Gas Chromatography-Flame Ionisation De tector (GC-FID). Results reveal that MLT1 exhibits 100% of conversion starting material into a cross-coupling product, which was alkene-based compound.","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"44 1","pages":"58-64"},"PeriodicalIF":0.0,"publicationDate":"2017-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91157597","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. Arramel, T. Kudernac, N. Katsonis, B. Feringa, B. Wees
We present a systematic scanning tunneling microscopy (STM) study of bias-dependent imaging of disulfur diarylethene (2S-DE) molecules on octanethiol (C8) monolayer at room temperature. In a rigid confinement of the C8 matrix, we did not observe any significant variation in the appearance of the 2S-DE. On the contrary, a reversal in the apparent height of the 2S-DE was present when the molecule was situated on a gold vacancy island. We attributed this finding to the presence of a new electronic state that became accessible for a tunneling event. In addition, the C8 surface structure underwent a reversible phase transformation from root 3 x root 3 R30 degrees hexagonal to c(4x2) square superlattice when the bias voltage was reduced from -825 mV to -425 mV or vice versa. Under a finite bias voltage, an appreciable topographic variation of the 2S-DE signature was demonstrated for the first time. This finding can be ascribed to a finite overlap of the associated wave functions that occurred between the tip state and the 2S-DE molecular energy level. We believe that physical insight on the bias-dependent imaging of organic molecules on solid surface is important towards the advancement of molecular electronics-based devices.
{"title":"Spectroscopic Contrast of Diarylethene Molecules on Octanethiol Monolayer","authors":"A. Arramel, T. Kudernac, N. Katsonis, B. Feringa, B. Wees","doi":"10.7454/MST.V21I2.3084","DOIUrl":"https://doi.org/10.7454/MST.V21I2.3084","url":null,"abstract":"We present a systematic scanning tunneling microscopy (STM) study of bias-dependent imaging of disulfur diarylethene (2S-DE) molecules on octanethiol (C8) monolayer at room temperature. In a rigid confinement of the C8 matrix, we did not observe any significant variation in the appearance of the 2S-DE. On the contrary, a reversal in the apparent height of the 2S-DE was present when the molecule was situated on a gold vacancy island. We attributed this finding to the presence of a new electronic state that became accessible for a tunneling event. In addition, the C8 surface structure underwent a reversible phase transformation from root 3 x root 3 R30 degrees hexagonal to c(4x2) square superlattice when the bias voltage was reduced from -825 mV to -425 mV or vice versa. Under a finite bias voltage, an appreciable topographic variation of the 2S-DE signature was demonstrated for the first time. This finding can be ascribed to a finite overlap of the associated wave functions that occurred between the tip state and the 2S-DE molecular energy level. We believe that physical insight on the bias-dependent imaging of organic molecules on solid surface is important towards the advancement of molecular electronics-based devices.","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"46 1","pages":"75-82"},"PeriodicalIF":0.0,"publicationDate":"2017-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91323208","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}
Y. Yassierli, N. Nurhayati, Marisa Anatasia, S. Bahri
Previous research has suggested that some traits ma y be useful as the predictors of risk behaviours be haviors. Therefore, personality traits seem to play a role in accident involvement. The purpose of this study is was to ex plore the relationship between the personality traits based on the Big Fiv e In entory (BFI) and worker accident experiences i n order to elaborate personality traits based intervention for workplace accident prevention. A cross cross-sectional study was conducted among 173 workers in a cement company using a set o f questionnaires consisting of respondents’ charact e istics, BFI, and self-reported accident experience. The correlat ions were computed using Goodman Kruskal’s Gamma. A negative correlation between Extraversion dimension and acci dent experience was found to be approaching signifi ca t (G=0.273, p = 0.061). Workers with lower Extraversion dimensions, based on BFI, are recommended to have p riority needs be prioritized for training or to be assigned to le ss hazardous workplaces.
先前的研究表明，一些特征可能是有用的，作为风险行为的预测因素。因此，人格特质似乎在事故参与中发挥了作用。摘要本研究的目的在于探讨基于大五人格特质(BFI)的人格特质与工伤经历的关系，以阐述基于人格特质的工伤事故预防干预。对某水泥公司的173名工人进行了一项横断面研究，使用了一套调查问卷，包括受访者的特征、BFI和自我报告的事故经历。使用Goodman Kruskal 's Gamma计算相关性。外倾维度与事故经历呈显著负相关(G=0.273, p = 0.061)。根据BFI，外倾性维度较低的工人建议有p优先需求，优先进行培训或分配到危险性较小的工作场所。
{"title":"Personality Trait Based Intervention for Workplace Accident Prevention","authors":"Y. Yassierli, N. Nurhayati, Marisa Anatasia, S. Bahri","doi":"10.7454/MST.V21I2.3087","DOIUrl":"https://doi.org/10.7454/MST.V21I2.3087","url":null,"abstract":"Previous research has suggested that some traits ma y be useful as the predictors of risk behaviours be haviors. Therefore, personality traits seem to play a role in accident involvement. The purpose of this study is was to ex plore the relationship between the personality traits based on the Big Fiv e In entory (BFI) and worker accident experiences i n order to elaborate personality traits based intervention for workplace accident prevention. A cross cross-sectional study was conducted among 173 workers in a cement company using a set o f questionnaires consisting of respondents’ charact e istics, BFI, and self-reported accident experience. The correlat ions were computed using Goodman Kruskal’s Gamma. A negative correlation between Extraversion dimension and acci dent experience was found to be approaching signifi ca t (G=0.273, p = 0.061). Workers with lower Extraversion dimensions, based on BFI, are recommended to have p riority needs be prioritized for training or to be assigned to le ss hazardous workplaces.","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"41 1","pages":"97-102"},"PeriodicalIF":0.0,"publicationDate":"2017-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81401266","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}
C. Fraiture, R. H. Susanto, F. X. Suryadi, Harrini Mutiara Hapsari Wahyu
Urban flooding often times staggers the livelihood in an urban area, which most likely happens in the lowland urban area. Therefore, the existing urban drainage system hould be improved in order to tackle the upcoming urban flooding events, which are more than likely to be more devas tating than those in the previous years. The resear ch location is in Palembang, Sumatra, Indonesia, where 30% of its urb an part is a lowland area. The selected Aur Sub Cat chment is located in Silaberanti. The main objective of this re earch is to improve the current drainage system in order to achieve the optimal design for urban drainage arrangement. This research was developed using Duflow Modelling Studio 3.8.3 in collaboration with ArcGIS 10.1 to schematize the dr ainage system and analyse the spatial and topograph ical condition of the research area. As a result, there are three dev lopment scenarios established by Duflow Modelli ng Studio in order to improve the drainage system in the research area . The first scenario is the current and extreme con dition in the study area. The second scenario is the extreme condition, which is represented by the extreme rainfall. The third scenario is the improvement possibilities of the existing drain age system. There are three different types of impr ovements and modifications for the third scenario which are: can al dredging, canal dike/embankment, a pump installa tion, and a flap gate installation. In conclusion, based on three differe nt scenario analyses, the most feasible, suitable, eff ctive, and efficient alternative for overcoming the flooding in Silabera nti is a flap gate installation combined with dike construction in the flood risk sections of the river because it works a utomatically depending on the water level in the Ri ver.
城市洪涝灾害常常使城市居民的生计受到影响，这种情况最可能发生在城市的低地地区。因此，现有的城市排水系统应该得到改善，以应对即将到来的城市洪水事件，这些事件很可能比往年更具破坏性。研究地点位于印度尼西亚苏门答腊岛的巨港，其中30%的城市是低地地区。被选中的阿乌亚猫羊皮纸位于西拉伯拉蒂。本研究的主要目的是改善现有的排水系统，以实现城市排水布置的优化设计。本研究使用Duflow modeling Studio 3.8.3与ArcGIS 10.1合作开发，对研究区域的空间和地形条件进行了示意图和分析。因此，为了改善研究区域的排水系统，Duflow Modelli ng Studio建立了三种开发场景。第一个场景是研究区域的当前和极端条件。第二种情况是极端情况，以极端降雨为代表。第三种情况是改善现有排水系统的可能性。对于第三种情况，有三种不同类型的改进和修改:清淤、运河堤防/堤防、安装泵和安装挡板门。总之，基于三种不同的情景分析，克服Silabera nti洪水的最可行、最合适、最有效和最有效的替代方案是在河流的洪水风险路段安装翻盖闸门并结合堤防建设，因为它可以根据漓江的水位自动工作。
{"title":"Urban Drainage Management and Flood Control Improvement Using the Duflow Case Study: Aur Sub Catchment, Palembang, South Sumatra, Indonesia","authors":"C. Fraiture, R. H. Susanto, F. X. Suryadi, Harrini Mutiara Hapsari Wahyu","doi":"10.7454/MST.V21I2.3085","DOIUrl":"https://doi.org/10.7454/MST.V21I2.3085","url":null,"abstract":"Urban flooding often times staggers the livelihood in an urban area, which most likely happens in the lowland urban area. Therefore, the existing urban drainage system hould be improved in order to tackle the upcoming urban flooding events, which are more than likely to be more devas tating than those in the previous years. The resear ch location is in Palembang, Sumatra, Indonesia, where 30% of its urb an part is a lowland area. The selected Aur Sub Cat chment is located in Silaberanti. The main objective of this re earch is to improve the current drainage system in order to achieve the optimal design for urban drainage arrangement. This research was developed using Duflow Modelling Studio 3.8.3 in collaboration with ArcGIS 10.1 to schematize the dr ainage system and analyse the spatial and topograph ical condition of the research area. As a result, there are three dev lopment scenarios established by Duflow Modelli ng Studio in order to improve the drainage system in the research area . The first scenario is the current and extreme con dition in the study area. The second scenario is the extreme condition, which is represented by the extreme rainfall. The third scenario is the improvement possibilities of the existing drain age system. There are three different types of impr ovements and modifications for the third scenario which are: can al dredging, canal dike/embankment, a pump installa tion, and a flap gate installation. In conclusion, based on three differe nt scenario analyses, the most feasible, suitable, eff ctive, and efficient alternative for overcoming the flooding in Silabera nti is a flap gate installation combined with dike construction in the flood risk sections of the river because it works a utomatically depending on the water level in the Ri ver.","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"23 1","pages":"83-92"},"PeriodicalIF":0.0,"publicationDate":"2017-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80035772","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, polyurethane (PU) films from palm ke rn l oil-based polyester (PKO-p) incorporated multi -walled carbon nanotubes (MWNTs) are prepared via a evaporative casting method. Nanoparticle fluid d ispersions containing 0.02%, 0.03%, and 0.05% wt. of MWNTs are added into PKO-p based resin and mixed by digital probe sonicator fo r 30 min followed by mixing with isocyanate to produce PU-MW NTs composite films. The mechanical properties, swe lling, water vapour transmission rate (WVTR) and conductiv ity of the PU-MWNTs composite films are examined. R esults show that the toughness (T) or flexibility, the ten sile strength (TS), and Young’s modulus (YM) values of PU-MWNTs composite films increase with the increasing concen trations of MWNT. In contrast, the water vapour tra nsmission rate (WVTR) and swelling test of PU-MWNTs composite film s decrease with the increase of MWNT concentrations . For conductivity testing, the film with 0.05 wt.% MWNT (PU-5) has the highest conductivity value at 2.19 x 10 S cm. In summary, incorporation of MWNTs has improved the me chanical properties of the polyurethane composites film .
本研究采用蒸发铸造法制备了棕榈油基聚酯(PKO-p)复合多壁碳纳米管(MWNTs)聚氨酯(PU)薄膜。将含有0.02%、0.03%和0.05%重量纳米纳米管的纳米颗粒流体分散体加入PKO-p基树脂中，用数字探针超声器混合30 min，然后与异氰酸酯混合，制得PU-MW纳米管复合膜。测试了PU-MWNTs复合膜的力学性能、热应力、水蒸气透过率和电导率。结果表明，pu -MWNT复合膜的韧性(T)或柔韧性、弹性强度(TS)和杨氏模量(YM)值随MWNT浓度的增加而增加。PU-MWNTs复合膜的水蒸气透过率(WVTR)和溶胀试验均随MWNT浓度的增加而降低。对于电导率测试，0.05 wt.% MWNT (PU-5)的薄膜电导率最高，为2.19 x 10 S cm。综上所述，纳米碳管的加入改善了聚氨酯复合薄膜的力学性能。
{"title":"Physical and Mechanical Properties of Palm Kernel Oil-Based Polyester Polyurethane/Multi-Walled Carbon Nanotube Composites","authors":"K. M. Amin, M. A. Zailani, N. Zulkifli, K. Badri","doi":"10.7454/MST.V21I2.3083","DOIUrl":"https://doi.org/10.7454/MST.V21I2.3083","url":null,"abstract":"In this study, polyurethane (PU) films from palm ke rn l oil-based polyester (PKO-p) incorporated multi -walled carbon nanotubes (MWNTs) are prepared via a evaporative casting method. Nanoparticle fluid d ispersions containing 0.02%, 0.03%, and 0.05% wt. of MWNTs are added into PKO-p based resin and mixed by digital probe sonicator fo r 30 min followed by mixing with isocyanate to produce PU-MW NTs composite films. The mechanical properties, swe lling, water vapour transmission rate (WVTR) and conductiv ity of the PU-MWNTs composite films are examined. R esults show that the toughness (T) or flexibility, the ten sile strength (TS), and Young’s modulus (YM) values of PU-MWNTs composite films increase with the increasing concen trations of MWNT. In contrast, the water vapour tra nsmission rate (WVTR) and swelling test of PU-MWNTs composite film s decrease with the increase of MWNT concentrations . For conductivity testing, the film with 0.05 wt.% MWNT (PU-5) has the highest conductivity value at 2.19 x 10 S cm. In summary, incorporation of MWNTs has improved the me chanical properties of the polyurethane composites film .","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"228 1","pages":"70-74"},"PeriodicalIF":0.0,"publicationDate":"2017-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89172922","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}
Measurements of residual stress on the 57Fe25Cr15Ni steel plate with no-filler TIG-welding process wer e carried out. This work was conducted to determine the nature of weld ability in synthesized steel. The bulks were f ormed in a dimension of 30x20x7 mm 3 to ease data retrieval. Results show that the large st residual stress occurred in the weld metal area, amounting to 82.40 MPa with lattice str tching of 0.18%. Conversely, the values decreased to 65.92 MPa and a stretch of 0.14% in the HAZ area. This residu al stress is a tensile stress that can reduce the m echanical strength of the material since it adds to the applied loads. Th is was confirmed by microstructure observations. Th e carbon content was very high in the dark lines. Weaken materials u sually start from this side and could initiate the intergranular cracks that rapidly migrate among its grain boundaries.
{"title":"Residual Stress Measurements on the TIG Weld Joint of 57Fe15Cr25Ni Austenitic Steel for Structural Material Applications by Means X-Ray Diffraction Techniques","authors":"P. Parikin, A. H. Ismoyo, R. Iskandar, A. Dimyati","doi":"10.7454/MST.V21I2.3080","DOIUrl":"https://doi.org/10.7454/MST.V21I2.3080","url":null,"abstract":"Measurements of residual stress on the 57Fe25Cr15Ni steel plate with no-filler TIG-welding process wer e carried out. This work was conducted to determine the nature of weld ability in synthesized steel. The bulks were f ormed in a dimension of 30x20x7 mm 3 to ease data retrieval. Results show that the large st residual stress occurred in the weld metal area, amounting to 82.40 MPa with lattice str tching of 0.18%. Conversely, the values decreased to 65.92 MPa and a stretch of 0.14% in the HAZ area. This residu al stress is a tensile stress that can reduce the m echanical strength of the material since it adds to the applied loads. Th is was confirmed by microstructure observations. Th e carbon content was very high in the dark lines. Weaken materials u sually start from this side and could initiate the intergranular cracks that rapidly migrate among its grain boundaries.","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"27 1","pages":"49-57"},"PeriodicalIF":0.0,"publicationDate":"2017-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90559946","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 characterization of biopolymer-based solid polymer electrolytes (SPEs) has been carried out in this present work. Cellulose derivative was chosen due to its superior physical attributes. In this work, NH4Br-doped glycerol plasticized carboxyl methylcellulose-based SPEs were successfully prepared via the solution casting method. The conductivity and dielectric properties of the prepared films were investigated using the impedance analysis which presented ~1.91×10-3 Scm-1 (with addition of 6 wt% of glycerol). In addition, the studied SPE system shows a non-Debye behaviour without a single relaxation time. The findings of the research indicate that the complexes of NH4Br and glycerol in the cellulose derivative influence the ionic conductivity and dielectric properties of the SPE system.
{"title":"A Study on Dielectric Properties of The Cellulose Derivative-NH4Br-Glycerol- Based The Solid Polymer Electrolyte System","authors":"N. Rasali, Saifful K Muzakir, A. S. Samsudin","doi":"10.7454/MST.V21I2.3082","DOIUrl":"https://doi.org/10.7454/MST.V21I2.3082","url":null,"abstract":"The characterization of biopolymer-based solid polymer electrolytes (SPEs) has been carried out in this present work. Cellulose derivative was chosen due to its superior physical attributes. In this work, NH4Br-doped glycerol plasticized carboxyl methylcellulose-based SPEs were successfully prepared via the solution casting method. The conductivity and dielectric properties of the prepared films were investigated using the impedance analysis which presented ~1.91×10-3 Scm-1 (with addition of 6 wt% of glycerol). In addition, the studied SPE system shows a non-Debye behaviour without a single relaxation time. The findings of the research indicate that the complexes of NH4Br and glycerol in the cellulose derivative influence the ionic conductivity and dielectric properties of the SPE system.","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"21 1","pages":"65-69"},"PeriodicalIF":0.0,"publicationDate":"2017-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73613574","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}
Bio ethanol is one of the potential fuels in the fu ture. However, ethanol in water mixture has an azeo tropic concentration of 95.6 wt. %, which makes it difficult to purify furt her. The common method of purification is by using an azeotropic distillation column, which requires an intensive en ergy and an addition of specific solvent. In this s tudy, ethanol purification is done using an adsorption column pac ked with zeolite Raschig rings. The natural zeolite r ng was modified beforehand using the NaOH solution to enha nce the material’s water adsorption performance. Th e ethanol purity can reach more than 99% with the modified ze olit packing. The modification also increases the saturation time of the packed bed column, thus making it more effic i nt.
{"title":"Ethanol Purification Using Activated Natural Zeolite","authors":"C. Purnomo, N. Putri, I. Perdana, H. Hinode","doi":"10.7454/MST.V21I2.3086","DOIUrl":"https://doi.org/10.7454/MST.V21I2.3086","url":null,"abstract":"Bio ethanol is one of the potential fuels in the fu ture. However, ethanol in water mixture has an azeo tropic concentration of 95.6 wt. %, which makes it difficult to purify furt her. The common method of purification is by using an azeotropic distillation column, which requires an intensive en ergy and an addition of specific solvent. In this s tudy, ethanol purification is done using an adsorption column pac ked with zeolite Raschig rings. The natural zeolite r ng was modified beforehand using the NaOH solution to enha nce the material’s water adsorption performance. Th e ethanol purity can reach more than 99% with the modified ze olit packing. The modification also increases the saturation time of the packed bed column, thus making it more effic i nt.","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"165 1","pages":"93-96"},"PeriodicalIF":0.0,"publicationDate":"2017-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74899593","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}
PLUME CONTAMINATION MEASUREMENTS OF AN ADDITIVELY-PRINTED GOX/ABS HYBRID THRUSTER by David A. Brewer, Master of Science Utah State University, 2018 Major Professor: Dr. Stephen A. Whitmore Department: Mechanical and Aerospace Engineering Historically, due to the lack of a reliable, on-demand, and multiple-use ignition methodology, hybrid rockets have never been previously considered for in-space propulsion. Recently, the Propulsion Research Laboratory at Utah State University has developed unique arc-ignition system that overcomes this problem and allows hybrids to be started, stopped, and restarted with a high degree of reliability, and requiring a low power input. The technology is derived from the unique electrical breakdown properties of 3-D printed plastics like ABS. Because ABS is an entirely new material for propulsion applications, and no database exists to describe the potential deleterious effects of the exhaust plume on spacecraft surfaces. Adsorption of propellant effluents on spacecraft surfaces can create multiple operational concerns; for example, deposition of molecules on solar arrays and thermal control surfaces can lead to decreased power production and increased spacecraft temperatures. This paper presents the results from a set of preliminary
作者:David a . Brewer，犹他州立大学理学硕士，2018年专业教授:Stephen a . Whitmore博士系:机械与航空航天工程历史上，由于缺乏可靠的、按需的、多用途的点火方法，混合火箭以前从未被考虑用于太空推进。最近，犹他州立大学推进研究实验室开发了一种独特的电弧点火系统，克服了这一问题，使混合动力汽车能够以高可靠性启动、停止和重新启动，并且需要低功率输入。这项技术源于ABS等3d打印塑料独特的电击穿特性，因为ABS是一种用于推进应用的全新材料，目前还没有数据库可以描述排气羽流对航天器表面的潜在有害影响。推进剂流出物在航天器表面的吸附会产生多重操作问题;例如，在太阳能电池阵列和热控制表面上沉积分子会导致发电量下降和航天器温度升高。本文给出了一组初步计算的结果
{"title":"Plume Contamination Measurements of an Additively-Printed GOX/ABS Hybrid Thruster","authors":"D. Brewer","doi":"10.2514/6.2017-4982","DOIUrl":"https://doi.org/10.2514/6.2017-4982","url":null,"abstract":"PLUME CONTAMINATION MEASUREMENTS OF AN ADDITIVELY-PRINTED GOX/ABS HYBRID THRUSTER by David A. Brewer, Master of Science Utah State University, 2018 Major Professor: Dr. Stephen A. Whitmore Department: Mechanical and Aerospace Engineering Historically, due to the lack of a reliable, on-demand, and multiple-use ignition methodology, hybrid rockets have never been previously considered for in-space propulsion. Recently, the Propulsion Research Laboratory at Utah State University has developed unique arc-ignition system that overcomes this problem and allows hybrids to be started, stopped, and restarted with a high degree of reliability, and requiring a low power input. The technology is derived from the unique electrical breakdown properties of 3-D printed plastics like ABS. Because ABS is an entirely new material for propulsion applications, and no database exists to describe the potential deleterious effects of the exhaust plume on spacecraft surfaces. Adsorption of propellant effluents on spacecraft surfaces can create multiple operational concerns; for example, deposition of molecules on solar arrays and thermal control surfaces can lead to decreased power production and increased spacecraft temperatures. This paper presents the results from a set of preliminary","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"1 1","pages":"10"},"PeriodicalIF":0.0,"publicationDate":"2017-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72872072","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}
{"title":"Using Nucleon Multiplicities to Analyze Anti-Neutrino Interactions with Nuclei","authors":"M. Elkins","doi":"10.2172/1371577","DOIUrl":"https://doi.org/10.2172/1371577","url":null,"abstract":"University of Minnesota M.S. thesis.July 2017. Major: Physics. Advisor: Richard Gran. 1 computer file (PDF); xix 115 pages.","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"11 1","pages":"1"},"PeriodicalIF":0.0,"publicationDate":"2017-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79393151","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}
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