Theory of Computing Systems \/ Mathematical Systems Theory最新文献_第2页

Effect of Catholyte Concentration on Current Production During Chocolate Industry Wastewater Treatment by a Microbial Fuel Cell 微生物燃料电池处理巧克力工业废水时电解液浓度对电流产生的影响

Theory of Computing Systems \/ Mathematical Systems Theory Pub Date : 2020-09-01 DOI: 10.7454/mst.v24i2.418

D. R. Wulan, S. Notodarmojo

{"title":"Effect of Catholyte Concentration on Current Production During Chocolate Industry Wastewater Treatment by a Microbial Fuel Cell","authors":"D. R. Wulan, S. Notodarmojo","doi":"10.7454/mst.v24i2.418","DOIUrl":"https://doi.org/10.7454/mst.v24i2.418","url":null,"abstract":"Microbial fuel cells (MFCs) use bacteria as a catalyst to oxidize organic and/or inorganic substrates and produce electric currents. Wastewater could function as an electron donor in the anode chamber and, thus, represents a very promising energy source. Catholytes, as electron acceptors, influence power production in MFCs by increasing the availability of electrons. The present research aims to determine the influence of catholyte concentration on current production in an aerobic two-chamber MFC. Aerobic treatment was carried out in the two-chamber MFC operated in an incubator at 37  1 °C with and without aeration in the cathode chamber. Wastewater from the chocolate industry was used as a substrate and oxidized by using a bacterial consortium isolated from the sludge wastewater itself. The catholytes used were 0.01, 0.05, 0.1, and 0.3 N NaCl. In the presence of NaCl, the chemical oxygen demand (COD) removal efficiency in the cathode chamber of the MFC was approximately 65%–83% without aeration and 76%–89% with aeration after 72 hours. The current density increased as the catholyte concentration increased to 0.05 N, after which the oxidation process shifted from the anode chamber to the cathode chamber. Addition of O2 to the cathode chamber influenced current production.","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"20 1","pages":"53-58"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77465220","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Performance of adhesive waterproofing as regardsof lateral water filtration 胶粘剂防水的侧向水过滤性能

Theory of Computing Systems \/ Mathematical Systems Theory Pub Date : 2020-08-31 DOI: 10.31448/mstj.02.01.2019.77-93

Gergely Dobszay, R. Nemes, F. Andriska, Dániel Heincz, K. Kovács, Richárd Reisch, T. Simon

{"title":"Performance of adhesive waterproofing as regardsof lateral water filtration","authors":"Gergely Dobszay, R. Nemes, F. Andriska, Dániel Heincz, K. Kovács, Richárd Reisch, T. Simon","doi":"10.31448/mstj.02.01.2019.77-93","DOIUrl":"https://doi.org/10.31448/mstj.02.01.2019.77-93","url":null,"abstract":"Self-bonding layers In order to simplify construction, to decrease the amount of special auxiliaries, to decrease the damages due to faults, to increase safety and to decrease the necessary space, material producers developed such waterproofing systems which can establish mechanical or chemical working together capability with in situ reinforced concrete load bearing structures. These technologies differ significantly from customary waterproofing in practice. They participate in water displacement not as a separate layer, but as the integral part of an underground civil engineering structure. As long as a waterproofing system functions properly, any type is appropriate. The difference becomes significant only, when due to a breach a fault of the waterproofing system occurs. Only from then on increases the importance of the type of the original system. During our studies we punctured deliberately new, adhesive waterproofing systems and for reference a customary membrane all of which were applied on concrete, hence tested their performance as a structure by concentrating mainly on lateral water filtration.","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"61 2-3 1","pages":"77-93"},"PeriodicalIF":0.0,"publicationDate":"2020-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78452165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ethylene Carbonate and Polyethylene Glycol as Efficient Plasticizers in CMC-PVA-NH4NO3-Based Polymer Electrolyte 碳酸乙烯和聚乙二醇在cmc - pva - nh4no3基聚合物电解质中的高效增塑剂

Theory of Computing Systems \/ Mathematical Systems Theory Pub Date : 2020-04-29 DOI: 10.7454/MST.V24I1.3833

Noor Saadiah Mohd Ali, Y. Nagao, A. S. Samsudin

{"title":"Ethylene Carbonate and Polyethylene Glycol as Efficient Plasticizers in CMC-PVA-NH4NO3-Based Polymer Electrolyte","authors":"Noor Saadiah Mohd Ali, Y. Nagao, A. S. Samsudin","doi":"10.7454/MST.V24I1.3833","DOIUrl":"https://doi.org/10.7454/MST.V24I1.3833","url":null,"abstract":"This study investigated the influence of plasticizers (polyethylene glycol [PEG] and ethylene carbonate [EC]) on the ionic conduction of CMC-PVA-NH4NO3. Blended biopolymer electrolytes (BBEs) based on carboxymethyl cellulose– polyvinyl alcohol (CMC-PVA) doped with ammonium nitrate (NH4NO3) were obtained via casting solution technique incorporated with PEG and EC, which acted as plasticizers. Electrical impedance spectroscopy (EIS) was conducted to evaluate the effect of plasticization on the ionic conduction properties. The ionic conductivity improved from 1.70 × 10 S/cm for un-plasticized BBEs to 3.92 × 10 S/cm for plasticized BBEs with EC and 3.00 × 10 S/cm for plasticized BBEs with PEG. The improvement indicated that the plasticizers weakened the Coulombic force and promoted further dissociation in the ionic dopant. The highest ionic conductivity was achieved for BBEs plasticized with EC, thereby suggesting the suitability of EC as plasticizer in this present system. The BBE system showed the Arrhenius characteristic at elevated temperatures and demonstrated increasing ionic conductivity. Dielectric properties of all BBE systems were found to improve upon the addition of EC and PEG, demonstrating their correlation with ionic conductivity.","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"143 1","pages":"13-17"},"PeriodicalIF":0.0,"publicationDate":"2020-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80278887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Effects of Collision Damage on the Ultimate Strength of FPSO Vessels 碰撞损伤对FPSO船舶极限强度的影响

Theory of Computing Systems \/ Mathematical Systems Theory Pub Date : 2020-04-29 DOI: 10.7454/MST.V24I1.3732

M. Alie, Dian Ramasari, T. Rachman, R. Adiputra

{"title":"Effects of Collision Damage on the Ultimate Strength of FPSO Vessels","authors":"M. Alie, Dian Ramasari, T. Rachman, R. Adiputra","doi":"10.7454/MST.V24I1.3732","DOIUrl":"https://doi.org/10.7454/MST.V24I1.3732","url":null,"abstract":"Floating production storage offloading (FPSO) vessels are movable offshore structures. These structures are designed with large dimensions, and their decks are loaded with several types of equipment. During collision damage, the hull and deck parts loaded with equipment are severely affected. Therefore, the ultimate strength of FPSO vessels should be thoroughly checked and evaluated. The objective of the present study is to analyze the ultimate strength of FPSO vessels against collision damage characterized by hogging and sagging under longitudinal bending. The cross section of an FPSO vessel is modeled with elements composed of stiffened and unstiffened plates. The vessel length is assumed to occupy one frame space. The ultimate strength of FPSO vessels against collision damage is determined by performing a numerical analysis under hogging and sagging conditions. Multipoint constraint is applied to both sides of the cross section, and the material properties are set to be constant. Collision damage is represented by the loss of element stiffness, and it represents the percentage of the ship’s depth. For the extent of transversal damage, B/16 is set to be constant. The minimum and maximum collision damages are taken as 10% and 60% of the ship’s depth, respectively. Numerical results show that the ultimate strength of FPSO vessels and their bending stiffness decrease under collision.","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"63 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2020-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84358490","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Ionic Conductivity and Electrochemical Properties of Alginate–NN4NO3-Based Biopolymer Electrolytes for EDLC Application 海藻酸盐- nn4no3基EDLC生物聚合物电解质的离子电导率和电化学性能

Theory of Computing Systems \/ Mathematical Systems Theory Pub Date : 2020-04-29 DOI: 10.7454/MST.V24I1.3832

Norfatihah Mazuki, N. M. J. Rasali, B. Sahraoui, A. S. Samsudin

引用次数: 2

Comparison of Phytoremediation and Filtration for Diamond-mine-tailings Water Treatment 植物修复与过滤处理金刚石尾矿水的比较研究

Theory of Computing Systems \/ Mathematical Systems Theory Pub Date : 2020-04-29 DOI: 10.7454/MST.V24I1.3821

M. Noor, Mijani Rahman, Akhmad Gazali, N. Kania, A. Rahma, E. L. Rampun, A. E. Pratiwi, M. Elma

{"title":"Comparison of Phytoremediation and Filtration for Diamond-mine-tailings Water Treatment","authors":"M. Noor, Mijani Rahman, Akhmad Gazali, N. Kania, A. Rahma, E. L. Rampun, A. E. Pratiwi, M. Elma","doi":"10.7454/MST.V24I1.3821","DOIUrl":"https://doi.org/10.7454/MST.V24I1.3821","url":null,"abstract":"The water pollution caused by diamond mine activities can kill aquatic life. In this work, we used phytoremediation and filtration to treat pond water polluted by the tailings of a diamond mine located in South Kalimantan, Indonesia. Einchhornia crassipes (water hyacinth) was utilized as the biomass for the phytoremediation process. Gravel (10–15 mm) and sand (0.1–1 mm) were used as filter media in the simple filtration setup, using an up-flow system (bottom to top). In the experiment, 16 L of diamond tailing water was poured into five phytoremediation reactors (each 60 L in volume), which were then tested over seven days. A pretreatment analysis of the tailings water showed that its biochemical oxygen demand (BOD) of 8.9 mg L and chemical oxygen demand (COD) of 22 mg L exceeded the national maximum standards of 2 mg L and 10 mg L, respectively. The experimental results demonstrate that both phytoremediation and filtration could increase the dissolved oxygen concentration (4.7 mg.L) and reduce the BOD (3.2 mg.L), COD (6.5 mg.L), Fe (0.6 mg.L), Mn (0.16 mg.L), and ammonia (0.63 mg.L) concentrations from those measured in the raw diamond-mine-tailings water. The phytoremediation performance was better than that of filtration. The COD values were successfully reduced to the permissible limit, although the other parameters still failed to meet the government water quality regulation requirements.","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"28 1","pages":"43-52"},"PeriodicalIF":0.0,"publicationDate":"2020-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81643301","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Current Status of Hydrothermal Treatment for Energy and Material Recovery Toward a Sustainable Post-consumer Material Cycle 面向可持续消费后材料循环的水热处理能源和材料回收的现状

Theory of Computing Systems \/ Mathematical Systems Theory Pub Date : 2020-04-29 DOI: 10.7454/MST.V24I1.3885

Baskoro Lokahita, M. Aziz, F. Takahashi

{"title":"Current Status of Hydrothermal Treatment for Energy and Material Recovery Toward a Sustainable Post-consumer Material Cycle","authors":"Baskoro Lokahita, M. Aziz, F. Takahashi","doi":"10.7454/MST.V24I1.3885","DOIUrl":"https://doi.org/10.7454/MST.V24I1.3885","url":null,"abstract":"The demand for energy-efficient and environmentally friendly municipal solid waste (MSW) processing has increased in developing countries. The thermochemical process offers a fast and reliable solution to reutilize or reduce the volume of MSW. Hydrothermal treatment is a novel MSW treatment technology that is compatible with high-moisture-content feedstock. It involves the thermal degradation of MSW in pressurized water or steam, which promotes the disintegration of cellulosic and polymer materials. Recent advances have shown effective MSW conversion into homogenous solid hydrochar with higher energy density. Alkali and chlorine content, which causes issues in combustors, was successfully removed due to the washing effect of hydrothermal treatment. The possibility of activated carbon production also exists because the surface area is significantly increased after the treatment. This paper presents an overview of the latest development of hydrothermal treatment in the field of post-consumer waste and MSW treatment, with particular focus on the operating conditions and physicochemical characteristics of the hydrochar. Several experimental results from post-consumer waste feedstock were compiled and interpreted using principal component analysis to observe the effect of different operating conditions and feedstock during the hydrothermal process.","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"233 1","pages":"25-33"},"PeriodicalIF":0.0,"publicationDate":"2020-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79037185","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Liquefaction Potential Analysis Based on Nonlinear Ground Response on the Coastline of Bengkulu City, Indonesia 基于非线性地面响应的印尼Bengkulu市海岸线液化潜力分析

Theory of Computing Systems \/ Mathematical Systems Theory Pub Date : 2020-04-29 DOI: 10.7454/MST.V24I1.3778

L. Z. Mase

{"title":"Liquefaction Potential Analysis Based on Nonlinear Ground Response on the Coastline of Bengkulu City, Indonesia","authors":"L. Z. Mase","doi":"10.7454/MST.V24I1.3778","DOIUrl":"https://doi.org/10.7454/MST.V24I1.3778","url":null,"abstract":"This paper presents the study of the seismic response and liquefaction potential of the coastal area of Bengkulu City during the September 2007 Sumatra earthquake. The study is conducted by collecting site investigation data (standard penetration test) and applying input motion to observe soil response. Synthetic ground motion is generated by considering the important aspects of earthquakes, including focal depth, epicenter, earthquake source, and site classification. The synthetized ground motion is then used as the input motion in the seismic response analysis. The results of this analysis are spectral acceleration and peak ground acceleration at each depth. The resulting spectral acceleration is compared with that specified in the seismic design code of Indonesia (SNI 03-1726-2012). Liquefaction potential analysis is performed on the basis of the results of the seismic response analysis. Results show that spectral acceleration depends on soil type. A high soil density equates to a low spectral response. The designed spectral acceleration may still be considered for each borehole, especially for T (period) < 1. However, for T > 1, spectral acceleration should be prioritized, especially for high-rise building construction. The liquefaction analysis reveals that a shallow depth is vulnerable to liquefaction. In general, this study could give a better understanding on the implementation of seismic ground response for liquefaction potential analysis.","PeriodicalId":22842,"journal":{"name":"Theory of Computing Systems \\/ Mathematical Systems Theory","volume":"31 1","pages":"34-42"},"PeriodicalIF":0.0,"publicationDate":"2020-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72817000","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Acute Toxicitystudy of Choline Based Ionic Liquids Towards Danio rerio fish and the Aggregation Behavior of Their Binary Mixtures 胆碱离子液体对斑马鱼的急性毒性研究及其二元混合物的聚集行为

Theory of Computing Systems \/ Mathematical Systems Theory Pub Date : 2020-02-27 DOI: 10.7454/mst.v23i3.3858

Mansoor ul Hassan Shah, N. Nasruddin, S. Yusup, M. Moniruzzaman

引用次数: 0

Influence of NH4F in Dextran Based Biopolymer Electrolytes: Conductivity and Electrical Analysis NH4F对葡聚糖基生物聚合物电解质的影响:电导率和电学分析

Theory of Computing Systems \/ Mathematical Systems Theory Pub Date : 2020-02-10 DOI: 10.7454/mst.v23i3.3729

M. H. Hamsan, M. Kadir, S. B. Aziz, Muhammad Amirul Solihin Azha, Saifful K Muzakir

引用次数: 3