This thesis gives a detailed design process for a pulsed type thruster. The thrust stand designed in this paper is for a Pulsed Plasma Thruster built by Sun Devil Satellite Laboratory, a student organization at Arizona State University. The thrust stand uses a torsional beam rotating to record displacement along with impulse-momentum theorem to find the impulse bit of the thruster, which varies largely from other design which focus on using the natural dynamics their fixtures. The target impulse to record on this fixture was estimated to be 275 μN-s of impulse. Through calibration and experimentation, the fixture is capable of recording an impulse of 332 μN-s ± 14.81 μN-s, close to the target impulse. The error due to noise was characterized and evaluated to be under 5% which is deemed to be acceptable. Aerospace Engineering Master’s Defense Detailed Design of a Pulsed Plasma Thrust Stand Andrew Verbin Advisor: Daniel White Timothy Takahashi April 13, 2017; 10:00AM; GWC 487 School for Engineering of Matter, Transport and Energy
本文详细介绍了脉冲型推力器的设计过程。本文设计的推力台是为亚利桑那州立大学学生组织太阳魔鬼卫星实验室研制的脉冲等离子体推进器设计的。推力架采用扭转梁旋转记录位移，并结合冲量-动量定理计算推力架的冲量，这与其他主要利用自然动力学装置的设计有很大的不同。在该夹具上记录的目标脉冲估计为275 μN-s。通过标定和实验，该夹具能够记录332 μN-s±14.81 μN-s的脉冲，接近目标脉冲。由噪声引起的误差被表征并评估为小于5%，这被认为是可以接受的。航空航天工程硕士答辩脉冲等离子体推力台详细设计Andrew Verbin顾问:Daniel White Timothy Takahashi 2017年4月13日;十时整;gwc487物质、运输与能源工程学院
{"title":"Detailed Design of a Pulsed Plasma Thrust Stand","authors":"A. J. Verbin","doi":"10.2514/6.2017-4523","DOIUrl":"https://doi.org/10.2514/6.2017-4523","url":null,"abstract":"This thesis gives a detailed design process for a pulsed type thruster. The thrust stand designed in this paper is for a Pulsed Plasma Thruster built by Sun Devil Satellite Laboratory, a student organization at Arizona State University. The thrust stand uses a torsional beam rotating to record displacement along with impulse-momentum theorem to find the impulse bit of the thruster, which varies largely from other design which focus on using the natural dynamics their fixtures. The target impulse to record on this fixture was estimated to be 275 μN-s of impulse. Through calibration and experimentation, the fixture is capable of recording an impulse of 332 μN-s ± 14.81 μN-s, close to the target impulse. The error due to noise was characterized and evaluated to be under 5% which is deemed to be acceptable. Aerospace Engineering Master’s Defense Detailed Design of a Pulsed Plasma Thrust Stand Andrew Verbin Advisor: Daniel White Timothy Takahashi April 13, 2017; 10:00AM; GWC 487 School for Engineering of Matter, Transport and Energy","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"2 1","pages":"5"},"PeriodicalIF":0.0,"publicationDate":"2017-06-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78292051","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}
We have completed the circuit design and packaging procedure for an NIH-funded neural implant, called a MOTE (Microscale Optoelectronically Transduced Electrode). Neural recording implants for mice have greatly advanced neuroscience, but they are often damaging and limited in their recording location. This project will result in free-floating implants that cause less damage, provide rapid electronic recording, and increase range of recording across the cortex. A low-power silicon IC containing amplification and digitization sub-circuits is powered by a dual-function gallium arsenide photovoltaic and LED. Through thin film deposition, photolithography, and chemical and physical etching, the Molnar Group and the McEuen Group (Applied and Engineering Physics department) will package the IC and LED into a biocompatible implant approximately 100μm. The IC and LED are complete and we have begun refining this packaging procedure in the Cornell NanoScale Science & Technology Facility. ICs with 3D time-resolved imaging capabilities can image microorganisms and other biological samples given proper packaging. A portable, flat, easily manufactured package would enable scientists to place biological samples on slides directly above the Molnar group’s imaging chip. We have developed a packaging procedure using laser cutting, photolithography, epoxies, and metal deposition. Using a flip-chip method, we verified the process by aligning and adhering a sample chip to a holder wafer. In the CNF, we have worked on a long-term metal-insulator-metal (MIM) capacitor characterization project. Former Fellow and continuing CNF user Kwame Amponsah developed the original procedure for the capacitor fabrication, and another former fellow, Jonilyn Longenecker, revised the procedure and began the arduous process of characterization. MIM caps are useful to clean room users as testing devices to verify electronic characteristics of their active circuitry. This project’s objective is to determine differences in current-voltage (IV) and capacitor-voltage (CV) relationships across variations in capacitor size and dielectric type. This effort requires an approximately 20-step process repeated for two-to-six varieties (dependent on temperature and thermal versus plasma options) of the following dielectrics: HfO2, SiO2, Al2O3, TaOx, and TiO2.
{"title":"Neural Implants, Packaging for Biocompatible Implants, and Improving Fabricated Capacitors","authors":"Elizabeth R. Agger","doi":"10.7298/X42805RK","DOIUrl":"https://doi.org/10.7298/X42805RK","url":null,"abstract":"We have completed the circuit design and packaging procedure for an NIH-funded neural implant, called a MOTE (Microscale Optoelectronically Transduced Electrode). Neural recording implants for mice have greatly advanced neuroscience, but they are often damaging and limited in their recording location. This project will result in free-floating implants that cause less damage, provide rapid electronic recording, and increase range of recording across the cortex. A low-power silicon IC containing amplification and digitization sub-circuits is powered by a dual-function gallium arsenide photovoltaic and LED. Through thin film deposition, photolithography, and chemical and physical etching, the Molnar Group and the McEuen Group (Applied and Engineering Physics department) will package the IC and LED into a biocompatible implant approximately 100μm. The IC and LED are complete and we have begun refining this packaging procedure in the Cornell NanoScale Science & Technology Facility. ICs with 3D time-resolved imaging capabilities can image microorganisms and other biological samples given proper packaging. A portable, flat, easily manufactured package would enable scientists to place biological samples on slides directly above the Molnar group’s imaging chip. We have developed a packaging procedure using laser cutting, photolithography, epoxies, and metal deposition. Using a flip-chip method, we verified the process by aligning and adhering a sample chip to a holder wafer. In the CNF, we have worked on a long-term metal-insulator-metal (MIM) capacitor characterization project. Former Fellow and continuing CNF user Kwame Amponsah developed the original procedure for the capacitor fabrication, and another former fellow, Jonilyn Longenecker, revised the procedure and began the arduous process of characterization. MIM caps are useful to clean room users as testing devices to verify electronic characteristics of their active circuitry. This project’s objective is to determine differences in current-voltage (IV) and capacitor-voltage (CV) relationships across variations in capacitor size and dielectric type. This effort requires an approximately 20-step process repeated for two-to-six varieties (dependent on temperature and thermal versus plasma options) of the following dielectrics: HfO2, SiO2, Al2O3, TaOx, and TiO2.","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"25 1","pages":"23"},"PeriodicalIF":0.0,"publicationDate":"2017-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82246922","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 present work was carried with new type and promising polymer electrolytes system by development of carboxyl methylcellulose (CMC) doped NH4Br and plasticized with polyethylene glycol (PEG). The sample was successfully prepared via solution casting with no separation phase and good mechanical properties. The electrical conductivity and thermal conductivity of CMC-NH4Br-PEG based PEs system have been measured by the electrical impedance spectroscopy method in the temperature range of 303–373 K. The highest ionic conductivity gained is 2.48 x 10-3 Scm-1 at ambient temperature for sample contain with 8 wt. % PEG. It can be concluded that the plasticized is accountable for the conductance and assist to enhancing the ionic conductivity of the CMC-NH4Br-PEG electrolyte system. The addition of PEG to the CMC-based electrolyte can enhance towards the cation mobility which is turn increases ionic conductivity. The conductivity-temperature of plasticized BdPEs system was found obeys the Arrhenius relation where the ionic conductivity increases with temperature and activation energy for the ions hopping of the highest conducting PEs system only required small value to migrate. The electrical studies show a non-Debye behaviour of BdPEs based on the analyzed data using complex permittivity, e* and complex electrical modulus, M* of the sample at different temperature.
研究了一种新型的聚合物电解质体系，即羧基甲基纤维素(CMC)掺杂NH4Br并经聚乙二醇(PEG)塑化。通过溶液铸造成功制备了无分离相、力学性能良好的样品。用电阻抗谱法测定了CMC-NH4Br-PEG基聚乙烯体系在303 ~ 373 K温度范围内的电导率和导热系数。对于含有8 wt. % PEG的样品，在室温下获得的最高离子电导率为2.48 x 10-3 cm-1。结果表明，增塑剂对CMC-NH4Br-PEG电解质体系的电导率有一定的促进作用，有助于提高其离子电导率。在cmc基电解质中加入聚乙二醇可以提高阳离子的迁移率，从而提高离子的电导率。发现塑化聚乙烯体系的电导率-温度服从Arrhenius关系，即离子电导率随温度升高而增大，而电导率最高的聚乙烯体系的离子跃迁活化能只需很小的值即可迁移。基于不同温度下样品的复介电常数e*和复电模量M*的分析数据，电学研究表明bdpe具有非德拜行为。
{"title":"Influence of Polyethylene Glycol (PEG) in CMC-NH4BR Based Polymer Electrolytes: Conductivity and Electrical Study","authors":"N. Zainuddin, A. S. Samsudin","doi":"10.7454/MST.V21I1.3078","DOIUrl":"https://doi.org/10.7454/MST.V21I1.3078","url":null,"abstract":"The present work was carried with new type and promising polymer electrolytes system by development of carboxyl \u0000methylcellulose (CMC) doped NH4Br and plasticized with polyethylene glycol (PEG). The sample was successfully \u0000prepared via solution casting with no separation phase and good mechanical properties. The electrical conductivity and \u0000thermal conductivity of CMC-NH4Br-PEG based PEs system have been measured by the electrical impedance spectroscopy method in the temperature range of 303–373 K. The highest ionic conductivity gained is 2.48 x 10-3 Scm-1 at ambient temperature for sample contain with 8 wt. % PEG. It can be concluded that the plasticized is accountable for \u0000the conductance and assist to enhancing the ionic conductivity of the CMC-NH4Br-PEG electrolyte system. The addition of PEG to the CMC-based electrolyte can enhance towards the cation mobility which is turn increases ionic conductivity. The conductivity-temperature of plasticized BdPEs system was found obeys the Arrhenius relation where the ionic conductivity increases with temperature and activation energy for the ions hopping of the highest conducting PEs system only required small value to migrate. The electrical studies show a non-Debye behaviour of BdPEs based on the analyzed data using complex permittivity, e* and complex electrical modulus, M* of the sample at different temperature.","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"17 1","pages":"37-42"},"PeriodicalIF":0.0,"publicationDate":"2017-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82142621","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}
High purity of Bioethanol is required in biofuel mi xing with gasoline (EXX). In bioethanol production li e, the azeotropic property of ethanol-water becomes the ba rrier for purification process. This study examined two bioethanol separation processes by support of simulation tools , Superpro Designer 9.0 software. Ethanol purity an d low costeconomical process were the major considerations. P urification method of vapor permeation membrane tec hnology was compared with distillation-adsorption method. Data from previous lab experiments and some literatures w re used. The results showed that distillation-adsorption method is more economical compared to vapor permeation tec hnology. Payback period of the simulation is 3.9 years and 4 .3 years to distillation adsorption and vapor perme ation respectively with each IRR value is 20.23% and 17.89%. Initial i nvestment value of vapor permeation is 9.6% higher t an distillation method. Significant difference observe d in operating costs, since more units involved in vapor permeation require more labors to operate.
{"title":"Purification Simulation With Vapor Permeation and Distillation-Adsorption In Bioethanol Plant","authors":"M. Gozan, Mia Sari Setiawan, Kenny Lischer","doi":"10.7454/MST.V21I1.3079","DOIUrl":"https://doi.org/10.7454/MST.V21I1.3079","url":null,"abstract":"High purity of Bioethanol is required in biofuel mi xing with gasoline (EXX). In bioethanol production li e, the azeotropic property of ethanol-water becomes the ba rrier for purification process. This study examined two bioethanol separation processes by support of simulation tools , Superpro Designer 9.0 software. Ethanol purity an d low costeconomical process were the major considerations. P urification method of vapor permeation membrane tec hnology was compared with distillation-adsorption method. Data from previous lab experiments and some literatures w re used. The results showed that distillation-adsorption method is more economical compared to vapor permeation tec hnology. Payback period of the simulation is 3.9 years and 4 .3 years to distillation adsorption and vapor perme ation respectively with each IRR value is 20.23% and 17.89%. Initial i nvestment value of vapor permeation is 9.6% higher t an distillation method. Significant difference observe d in operating costs, since more units involved in vapor permeation require more labors to operate.","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"31 1","pages":"43-48"},"PeriodicalIF":0.0,"publicationDate":"2017-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80001512","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. Sahlan, Dara Dienayati, D. Hamdi, S. Zahra, H. Hermansyah, M. Chulasiri
Propolis, a wax bee glue, have antioxidant activity and effective as broad spectrum UVB and UVA photop rotection sunscreens agent. To improve photoprotection activi ty n sunscreen cream, the propolis was encapsulate d by casein micelle. The Indonesian propolis was extracted by e thanol and separated the wax by freeze precipitatio n. The extract was encapsulated by casein and reduced their size b y ball mill homogenizer with the encapsulation effi ciency about 80% and size of particles about 80 nm. The particle s was applied in sunscreen cream, evaluate their st abillity and photoprotection activity Sun Protection Factor (SPF ) spectrophotometer (Optometric 290s). The results shows that the selected creams were stable and have moderate photo protection activities higher than the controls. The encapsulation process of propolis by casein micelle can improve t heir photoprotection activity.
{"title":"Encapsulation Process of Propolis Extract by Casein Micelle Improves Sunscreen Activity","authors":"M. Sahlan, Dara Dienayati, D. Hamdi, S. Zahra, H. Hermansyah, M. Chulasiri","doi":"10.7454/MST.V21I1.3072","DOIUrl":"https://doi.org/10.7454/MST.V21I1.3072","url":null,"abstract":"Propolis, a wax bee glue, have antioxidant activity and effective as broad spectrum UVB and UVA photop rotection sunscreens agent. To improve photoprotection activi ty n sunscreen cream, the propolis was encapsulate d by casein micelle. The Indonesian propolis was extracted by e thanol and separated the wax by freeze precipitatio n. The extract was encapsulated by casein and reduced their size b y ball mill homogenizer with the encapsulation effi ciency about 80% and size of particles about 80 nm. The particle s was applied in sunscreen cream, evaluate their st abillity and photoprotection activity Sun Protection Factor (SPF ) spectrophotometer (Optometric 290s). The results shows that the selected creams were stable and have moderate photo protection activities higher than the controls. The encapsulation process of propolis by casein micelle can improve t heir photoprotection activity.","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"51 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2017-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78392885","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}
E. M. Wigayati, T. Lestariningsih, C. Ratri, I. Purawiardi, B. Prihandoko
Lithium bis (oxalate) borate or LiBOB compound has c ptured interest of researchers, because it is pot entially viable to be used as electrolyte salt in lithium-ion battery system. This compound is easy to synthesize and con sidered to be more environmentally friendly compared to conventional e lectrolyte salt because LiBOB does not contain halo gen element. This research focused on the synthesis of LiBOB fin e powder, which main purpose is improving LiBOB sal t solubility in liquid electrolyte solution. This will aid the i on transfer between electrodes which in turn will i ncrease the electrolyte performance. Solid state reaction was employed in t his experiment. Synthesis of LiBOB compound was per formed by reacting oxalic acid dihydrate, lithium hydroxide m onohydrate, and boric acid. The resulting powder wa s then processed into fine powder using ball milling techn ique with varying milling time (0, 6, 10, and 13) h our. Microstructure of the sample was then analyzed to obtain informati on regarding phase formation, functional groups, gr ain surface morphology, surface area, pore volume, solubility, and ionic conductivity. The analysis shown that LiB O and LiBOB hydrate phase was formed during the reaction, there was no changed in existing phase during milling pr ocess, crystallinity index was shifted to lower value but there was no difference in functional groups. Highe st value in surface area was found to be 83.11 m /g, with pore volume of 1.21311e+02 A at 10 hours m illing. Smaller powder size resulted in higher solubility, unfortunately the ionic condu ctivity was found to be decreased.
双(草酸)硼酸锂(LiBOB)化合物因其在锂离子电池系统中作为电解质盐具有潜在的可行性而引起了研究人员的兴趣。该化合物易于合成，由于不含光晕元素，与传统的电解质盐相比，被认为是更环保的。本文主要研究了LiBOB纳米粉体的合成，其主要目的是提高LiBOB在液态电解质溶液中的溶解度。这将有助于电极之间的i - on传递，从而提高电解质的性能。本实验采用固相反应。以二水合草酸、一水合氢氧化锂和硼酸为原料，合成了LiBOB化合物。然后用球磨技术将得到的粉末在不同的球磨时间(0、6、10和13)h内加工成细粉。然后分析样品的微观结构，以获得有关相形成，官能团，谷物表面形貌，表面积，孔隙体积，溶解度和离子电导率的信息。分析表明，反应过程中形成了lib0和LiBOB水合物相，磨矿过程中现有相没有变化，结晶度指数下降，但官能团没有变化。在10小时的钻削过程中，比表面积最大值为83.11 m /g，孔隙体积为1.21311e+02 A。粉末粒度越小，溶解度越高，但离子电导率降低。
{"title":"Synthesis of LiBOB Fine Powder to Increase Solubility","authors":"E. M. Wigayati, T. Lestariningsih, C. Ratri, I. Purawiardi, B. Prihandoko","doi":"10.7454/MST.V21I1.3076","DOIUrl":"https://doi.org/10.7454/MST.V21I1.3076","url":null,"abstract":"Lithium bis (oxalate) borate or LiBOB compound has c ptured interest of researchers, because it is pot entially viable to be used as electrolyte salt in lithium-ion battery system. This compound is easy to synthesize and con sidered to be more environmentally friendly compared to conventional e lectrolyte salt because LiBOB does not contain halo gen element. This research focused on the synthesis of LiBOB fin e powder, which main purpose is improving LiBOB sal t solubility in liquid electrolyte solution. This will aid the i on transfer between electrodes which in turn will i ncrease the electrolyte performance. Solid state reaction was employed in t his experiment. Synthesis of LiBOB compound was per formed by reacting oxalic acid dihydrate, lithium hydroxide m onohydrate, and boric acid. The resulting powder wa s then processed into fine powder using ball milling techn ique with varying milling time (0, 6, 10, and 13) h our. Microstructure of the sample was then analyzed to obtain informati on regarding phase formation, functional groups, gr ain surface morphology, surface area, pore volume, solubility, and ionic conductivity. The analysis shown that LiB O and LiBOB hydrate phase was formed during the reaction, there was no changed in existing phase during milling pr ocess, crystallinity index was shifted to lower value but there was no difference in functional groups. Highe st value in surface area was found to be 83.11 m /g, with pore volume of 1.21311e+02 A at 10 hours m illing. Smaller powder size resulted in higher solubility, unfortunately the ionic condu ctivity was found to be decreased.","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"33 1","pages":"26-32"},"PeriodicalIF":0.0,"publicationDate":"2017-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86120013","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. Purnomo, Bernice Lenora, W. Budhijanto, H. Hinode
It is well known that zeolite is an efficient metal ions adsorbent. The excess charge of the zeolite b u lding blocks i.e. (AlO4) -5 and (SiO4) -4 creating a negative surface charge that attract me tal cations. Beside the surface charge, zeolite als o has three dimensional pore structure and reasonably large surface area which also can be used as adsor ption sites. Ease of cation uptake make it suitable for many process with adsorption and desorption application. This st udy was conducted to observe the sorption and ion exchange behaviour of zeolite-betonite rings toward iron and cobalt cations. The results shows that the adsorption patterns foll ow Langmuir isotherm with the highest uptake capaci ty is 59,9 mg/g for Fe(II) and 57. 8 mg/g for Co(II).
{"title":"Sorption and Ion Exchange Behaviour of Natural Zeolite Packing","authors":"C. Purnomo, Bernice Lenora, W. Budhijanto, H. Hinode","doi":"10.7454/MST.V21I1.3077","DOIUrl":"https://doi.org/10.7454/MST.V21I1.3077","url":null,"abstract":"It is well known that zeolite is an efficient metal ions adsorbent. The excess charge of the zeolite b u lding blocks i.e. (AlO4) -5 and (SiO4) -4 creating a negative surface charge that attract me tal cations. Beside the surface charge, zeolite als o has three dimensional pore structure and reasonably large surface area which also can be used as adsor ption sites. Ease of cation uptake make it suitable for many process with adsorption and desorption application. This st udy was conducted to observe the sorption and ion exchange behaviour of zeolite-betonite rings toward iron and cobalt cations. The results shows that the adsorption patterns foll ow Langmuir isotherm with the highest uptake capaci ty is 59,9 mg/g for Fe(II) and 57. 8 mg/g for Co(II).","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"1 1","pages":"33-36"},"PeriodicalIF":0.0,"publicationDate":"2017-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89420918","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}
Over consuming of caffeine is one of the factors to a few health problems such as insomnia, hypertensi on and cardiovascular disease. This preliminary study was conduc te to evaluate the Caffeine-Imprinted Polymer (CAF -MIP) toxicity that was synthesized for a new alternative method f or ecaffeination. It is crucial to evaluate the to xicity of CAF-MIPas this product is potential to be used as complimenta ry with any drinks containing caffeine. In this stu dy, the CAF-MIP toxicity potential was confirmed on Normal Chang Li ver cell (NCLC) based on its IC 50 value andacridine orange and propidium iodide (AO/PI) staining for mode of cell death observation.Proliferation assay was also cond ucte after 24, 48 and 72 hours at 30 μg/ml on NCLC and it showed t hat CAF-MIP promote NCLC growth as shown by at vari ous concentrationof CAF-MIPincrease the percentage of N CLC viability. Observation under light microscopes on NCLC incubated wit CAF-MIP and NIP showed the normal, v iable cell morphology, cuboidal and monolayer cell morphology and this can be seen with green fluorescence when v iew under fluorescence microscope. In conclusion, f rom this study, it is proved that the CAF-MIP does not initiate tox icity effects on human liver cells, meanwhile induc tion of cell proliferation was observed.
{"title":"In vitro toxicity evaluation of caffeine imprinted polymer (CAF-MIP) for decaffeination method on normal chang liver cells","authors":"F. Hashim, F. S. Mehamod, Naizatul Akmal Nawi","doi":"10.7454/MST.V21I1.3075","DOIUrl":"https://doi.org/10.7454/MST.V21I1.3075","url":null,"abstract":"Over consuming of caffeine is one of the factors to a few health problems such as insomnia, hypertensi on and cardiovascular disease. This preliminary study was conduc te to evaluate the Caffeine-Imprinted Polymer (CAF -MIP) toxicity that was synthesized for a new alternative method f or ecaffeination. It is crucial to evaluate the to xicity of CAF-MIPas this product is potential to be used as complimenta ry with any drinks containing caffeine. In this stu dy, the CAF-MIP toxicity potential was confirmed on Normal Chang Li ver cell (NCLC) based on its IC 50 value andacridine orange and propidium iodide (AO/PI) staining for mode of cell death observation.Proliferation assay was also cond ucte after 24, 48 and 72 hours at 30 μg/ml on NCLC and it showed t hat CAF-MIP promote NCLC growth as shown by at vari ous concentrationof CAF-MIPincrease the percentage of N CLC viability. Observation under light microscopes on NCLC incubated wit CAF-MIP and NIP showed the normal, v iable cell morphology, cuboidal and monolayer cell morphology and this can be seen with green fluorescence when v iew under fluorescence microscope. In conclusion, f rom this study, it is proved that the CAF-MIP does not initiate tox icity effects on human liver cells, meanwhile induc tion of cell proliferation was observed.","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"4 1","pages":"19-25"},"PeriodicalIF":0.0,"publicationDate":"2017-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77958801","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}
Development of fuel cladding and structural materials in Pb-Bi environment, especially at high temperature, is a critical issue for the deployment of LFR (Lead alloy-cooled Fast Reactor) and ADS (Accelerator Driven Transmutation System). This is because of the corrosive characteristic of Pb-Bi to metals as constituent materials of fuel cladding and structural of the reactors. Corrosion test of a high-chromium austenitic stainless steel i.e. SS316Ti in molten Pb-Bi at 550 oC has been carried out for about 300 hours continuously. The characterization using SEM-EDS (Scanning Electron Microscopy - Energy Dispersive X-ray Spectroscopy) showed that an iron oxide as the outer layer and a chromium oxide as the inner layer on the surface of the specimen were formed which in general have protected the steel specimen from corrosion and dissolution attack of Pb-Bi. However, small amount of Pb could penetrate into the iron oxide layer through ultra-narrow channels. Atomic Force Microscopy (AFM) with Electrostatic Force Microscopy (EFM) mode was employed to investigate the phenomena of the nano-channels early formation. The results of the nano-scale investigation showed clearly the formation of the channels at the early time of corrosion as the way of Pb to penetrate into iron oxide outer layer.
{"title":"Nano-Channels Early Formation Investigation on Stainless Steel 316Ti after Immersion in Molten Pb-Bi","authors":"A. K. Rivai, M. Panitra, A. Heinzel","doi":"10.7454/MST.V21I1.3074","DOIUrl":"https://doi.org/10.7454/MST.V21I1.3074","url":null,"abstract":"Development of fuel cladding and structural materials in Pb-Bi environment, especially at high temperature, is a critical issue for the deployment of LFR (Lead alloy-cooled Fast Reactor) and ADS (Accelerator Driven Transmutation System). This is because of the corrosive characteristic of Pb-Bi to metals as constituent materials of fuel cladding and structural of the reactors. Corrosion test of a high-chromium austenitic stainless steel i.e. SS316Ti in molten Pb-Bi at 550 oC has been carried out for about 300 hours continuously. The characterization using SEM-EDS (Scanning Electron Microscopy - Energy Dispersive X-ray Spectroscopy) showed that an iron oxide as the outer layer and a chromium oxide as the inner layer on the surface of the specimen were formed which in general have protected the steel specimen from corrosion and dissolution attack of Pb-Bi. However, small amount of Pb could penetrate into the iron oxide layer through ultra-narrow channels. Atomic Force Microscopy (AFM) with Electrostatic Force Microscopy (EFM) mode was employed to investigate the phenomena of the nano-channels early formation. The results of the nano-scale investigation showed clearly the formation of the channels at the early time of corrosion as the way of Pb to penetrate into iron oxide outer layer.","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"15 1","pages":"13-18"},"PeriodicalIF":0.0,"publicationDate":"2017-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90939894","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, progressive collapse potential of ge neric 3-, 8and 12-storey RC moment frame building s designed based on IBC-2006 code was investigated by performing non -linear static and dynamic analyses. It was observe d that the model structures had high potential for progressive collapse when the second floor column was suddenly removed. Then, the size of beams required to satisfy the fai lure criteria for progressive collapse was obtained by using the virtual work method; i.e., using the equilibrium of the ext ernal work done by gravity load due to loss of a co lumn and the internal work done by plastic rotation of beams. Ac cording to the nonlinear dynamic analysis results, the model structures designed only for normal load turned out t have strong potential for progressive collapse whereas the structures designed by plastic design concept for p r gressive collapse satisfied the failure criterion recommended by the GSA code.
{"title":"A Plastic Design Method for RC Moment Frame Buildings against Progressive Collapse","authors":"Hadi Faghihmaleki","doi":"10.7454/MST.V21I1.3073","DOIUrl":"https://doi.org/10.7454/MST.V21I1.3073","url":null,"abstract":"In this study, progressive collapse potential of ge neric 3-, 8and 12-storey RC moment frame building s designed based on IBC-2006 code was investigated by performing non -linear static and dynamic analyses. It was observe d that the model structures had high potential for progressive collapse when the second floor column was suddenly removed. Then, the size of beams required to satisfy the fai lure criteria for progressive collapse was obtained by using the virtual work method; i.e., using the equilibrium of the ext ernal work done by gravity load due to loss of a co lumn and the internal work done by plastic rotation of beams. Ac cording to the nonlinear dynamic analysis results, the model structures designed only for normal load turned out t have strong potential for progressive collapse whereas the structures designed by plastic design concept for p r gressive collapse satisfied the failure criterion recommended by the GSA code.","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"34 1","pages":"7-12"},"PeriodicalIF":0.0,"publicationDate":"2017-04-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76886273","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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