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Articles 91 - 120 of 209
Full-Text Articles in Chemical Engineering
Design Of Induction Motor Drive Without Velocity Sensor Using Current Vector Controller With Full And Reduced Observer Moving To Dq Axis, Ridwan Gunawan, Feri Yusivar, Wahidin Wahab, Zuhal A. Kadir
Design Of Induction Motor Drive Without Velocity Sensor Using Current Vector Controller With Full And Reduced Observer Moving To Dq Axis, Ridwan Gunawan, Feri Yusivar, Wahidin Wahab, Zuhal A. Kadir
Makara Journal of Technology
Design of Induction Motor Drive Without Velocity Sensor Using Current Vector Controller with Full and Reduced Observer Moving to DQ Axis. The observer is used in estimation velocity sensor usually in α-β axis, therefore this situation will need an extra transformation when we want to add compensator because the flux model is in direct and quadrature-axis dq. Every used the transformation to make possible emerge an error. So in this simulation is used a method to estimate the velocity of induction motor drive with observer that is moved to dq-axis. The model of actual motor used is in alfa-beta axis, …
Effect Of Firing Temperature And Holding Time On Characterization Of Al/Sic Metal Matrix Composites Produced By Pressureless Infiltration., Anne Zulfia, Myrna Ariati
Effect Of Firing Temperature And Holding Time On Characterization Of Al/Sic Metal Matrix Composites Produced By Pressureless Infiltration., Anne Zulfia, Myrna Ariati
Makara Journal of Technology
Effect of Firing Temperature and Holding Time on Characterization of Al/SiC Metal Matrix Composites Produced by Pressureless Infiltration. The production of Al-SiC metal matrix composite can be carried out by pressureless metal infiltration processs (PRIMEX). The experiment was conducted using aluminium AC2B ingot as a matrix and 50%Vf SiC powder as a reinforcement which is mixed with 10% Mg powder for wetting agent. The variables of this experiment are holding time and firing temperature to investigate the effect of these conditions on mechanical properties of Al-SiC metal matrix composites. Holding time was conducted for 2,5,8,10,12 hours and firing temperatures was …
Development Of Fiber-Optic Humidity Sensor Probe With Gelatin Cladding, Akhiruddin Maddu, Kun Modjahidin, Sar Sardy, Hamdani Zain
Development Of Fiber-Optic Humidity Sensor Probe With Gelatin Cladding, Akhiruddin Maddu, Kun Modjahidin, Sar Sardy, Hamdani Zain
Makara Journal of Technology
Development of Fiber-Optic Humidity Sensor Probe with Gelatin Cladding. Humidity sensor based on optical fiber with gelatin cladding has been developed. In this humidity sensor probe, the origin cladding of optical fiber is replaced by gelatin coating as humidity sensitive cladding. Testing of the optical fiber sensor probe was conducted by measuring of light intensity transmitted on the optical fiber probe for each variation of different humidity treatments. Response of the optical fiber sensor probe measured from 42%RH to 99%RH, the results show an optical transmission curve varied with relative humidity (RH). Optical transmission in the optical fiber probe increase …
Ultrasonically Set Glass Polyalkenoate Cements For Orthodontic Applications, D. A. Tanner, N. Rushe, Mark R. Towler
Ultrasonically Set Glass Polyalkenoate Cements For Orthodontic Applications, D. A. Tanner, N. Rushe, Mark R. Towler
Chemical and Biochemical Engineering Faculty Research & Creative Works
There is an accepted clinical requirement for a luting cement that can be command set upon satisfactory placement of an orthodontic appliance onto dentition. This work evaluates the suitability of ultrasound, imparted from a dental scaler, as a potential mechanism for achieving this. The net setting times and subsequent compressive strengths of a range of commercial and experimental glass polyalkenoate cements (GPCs) were evaluated, using modified ISO 9917 methods, when set both chemically and by ultrasound. The ultrasound was applied to the GPC through an orthodontic brace. It was possible to command set GPCs by the application of five to …
On The Performance Of Imt-2000 Communication Link Based On Stratospheric Platforms, Iskandar Iskandar, Shigeru Shimamoto
On The Performance Of Imt-2000 Communication Link Based On Stratospheric Platforms, Iskandar Iskandar, Shigeru Shimamoto
Makara Journal of Technology
A new means for providing wireless communication has been currently proposed. It is based on aerial vehicle known as High Altitude Platform or Stratospheric Platforms (SPF). The SPF will be operated at an altitude of 17-22 km above the ground. Therefore, the channel condition may be different compared with those of the conventional terrestrial or satellite wireless channel. In this paper, the channel propagation characteristic of such a system is firstly investigated by means of ray tracing algorithm. We emphasize our investigation in a typical urban environment, in which the mobile users mostly exist. We developed building block model for …
Modification Of Bonding Strength Test Of Wc Hvof Thermal Spray Coating On Rocket Nozzle, Bondan T. Sofyan, Haposan J. Pardede, Marizki Stefano, Edi Sofyan
Modification Of Bonding Strength Test Of Wc Hvof Thermal Spray Coating On Rocket Nozzle, Bondan T. Sofyan, Haposan J. Pardede, Marizki Stefano, Edi Sofyan
Makara Journal of Technology
Modification of Bonding Strength Test of WC HVOF Thermal Spray Coating on Rocket Nozzle. One way to reduce structural weight of RX-100 rocket is by modifying the nozzle material and processing. Nozzle is the main target in weight reduction due to the fact that it contributes 30 % to the total weight of the structur. An alternative for this is by substitution of massive graphite, which is currently used as thermal protector in the nozzle, with thin layer of HVOF (High Velocity Oxy-Fuel) thermal spray layer. This paper presents the characterization of nozzle base material as well as the modification …
Hybrid Identification System With Arx And Fast Fourier Transform In Application Of A Quarter Of Vehicle Half Active Suspension, Noveri Lysbetti M, Antonius R.
Hybrid Identification System With Arx And Fast Fourier Transform In Application Of A Quarter Of Vehicle Half Active Suspension, Noveri Lysbetti M, Antonius R.
Makara Journal of Technology
Hybrid Identification System with ARX and Fast Fourier Transform in Application of a Quarter of Vehicle Half Active Suspension. In a control system problem, identification system mechanism is a absolute thing, especially in adaptation controlling to disturbance changing. For that case, is needed an identification method which can identify the changing of disturbance in that system. The aim of this research is to give an alternative in system/plant identification which is a combination (hybrid) of ARX and Fast Fourier Transform. So, it is needed an algorithm design for identification process. In this case, the designed algorithm will be implemented in …
A Quantitative Model Of Error Accumulation During Pcr Amplification, Elsje Pienaar, M. Theron, M. Nelson, Hendrik J. Viljoen
A Quantitative Model Of Error Accumulation During Pcr Amplification, Elsje Pienaar, M. Theron, M. Nelson, Hendrik J. Viljoen
Hendrik J. Viljoen Publications
The amplification of target DNA by the polymerase chain reaction (PCR) produces copies which may contain errors. Two sources of errors are associated with the PCR process: (1) editing errors that occur during DNA polymerase-catalyzed enzymatic copying and (2) errors due to DNA thermal damage. In this study a quantitative model of error frequencies is proposed and the role of reaction conditions is investigated. The errors which are ascribed to the polymerase depend on the efficiency of its editing function as well as the reaction conditions; specifically the temperature and the dNTP pool composition. Thermally induced errors stem mostly from …
Retrofit Of Distillation Columns Using Thermodynamic Analysis, Yaşar Demirel
Retrofit Of Distillation Columns Using Thermodynamic Analysis, Yaşar Demirel
Papers in Physical Properties
Thermodynamic analysis provides the column grand composite curves and exergy loss profiles, which are becoming readily available for a converged distillation column simulation. For example, the Aspen Plus simulator performs the thermodynamic analysis through its Column–Targeting tool for rigorous column calculations. This study uses the column grand composite curves and the exergy loss profiles obtained from Aspen Plus to assess the performance of the existing distillation columns, and reduce the costs of operation by appropriate retrofits in a methanol plant. Effectiveness of the retrofits is also assessed by means of thermodynamics and economics. The methanol plant utilizes two distillation columns …
Optimisation Of The Composition Of An Acrylic Bone Cement: Application To Relative Amounts Of The Initiator And The Activator/Co-Initiator In Surgical Simplex®P, S. Madigan, M. R. Towler, G. Lewis
Optimisation Of The Composition Of An Acrylic Bone Cement: Application To Relative Amounts Of The Initiator And The Activator/Co-Initiator In Surgical Simplex®P, S. Madigan, M. R. Towler, G. Lewis
Chemical and Biochemical Engineering Faculty Research & Creative Works
In cemented arthroplasties, the two-part self-curing acrylic bone cement is currently the only material used for anchoring the total joint replacement to the contiguous bone. In virtually all commercially available formulations of this cement, the agents used for the initiation and activation/co-initiation of the radical polymerisation reaction are benzoyl peroxide (BPO) and N, N dimethyl-paratoluidine (DMPT), respectively. There are no reports in the open literature on the rationale for the amounts of these and other constituents in the formulations of the cement. Given the concerns that have been raised in the literature regarding the effect of residual DMPT on the …
Use Of A Modified Zirconia Support In The Separation Of Immunoproteins, Anuradha Subramanian, Sabyasachi Sarkar
Use Of A Modified Zirconia Support In The Separation Of Immunoproteins, Anuradha Subramanian, Sabyasachi Sarkar
Papers in Biotechnology
Zirconia beads (25–38 μm in diameter) were modified with N,N,N′,N′-ethylenediaminetetramethylenephosphonic acid to generate a zirconia based pseudoaffinity support, further referred to as r_PEZ. The influence of pH, salt concentration and temperature on the binding of human immunoglobulin G (hIgG) to r_PEZ was studied. Temperature had no significant impact on the maximum binding capacity (Qmax), and the equilibrium-binding constant (Kd), whereas pH and the salt concentration had a noticeable impact on both Qmax and Kd. The Qmax value of 55 mg hIgG/ml of bead was obtained at a pH of 5.5 and found to decrease with an increase of pH. The …
A Comparative Study Of Monoclonal Antibodies (Mabs) Purified From Cell Culture Supernatant On Edtpa-Modified Zirconia Beads And Protein A-Hyper D Support, Anuradha Subramanian, Blanca Martinez, Jill Holm, Peter W. Carr, Clayton V. Mcneff
A Comparative Study Of Monoclonal Antibodies (Mabs) Purified From Cell Culture Supernatant On Edtpa-Modified Zirconia Beads And Protein A-Hyper D Support, Anuradha Subramanian, Blanca Martinez, Jill Holm, Peter W. Carr, Clayton V. Mcneff
Papers in Biotechnology
Colloidal zirconia was spray dried to yield zirconia particles, which were further modified with N, N, N0, N0- Ethylenediamine tetra methylenephosphonic acid (EDTPA) to yield a sup-port for use in bioseparations. EDTPA modified zirconia particles will be further referred to as, r_PEZ. Cell culture supernatants rich in monoclonal antibody (Mab) subtypes IgG1, IgG2a, IgG2b, and IgG3 were chromatographed on a r_PEZ column, and on a protein A-hyper D col-umn that was purchased commercially. All Mab subtypes bound to r_PEZ and process yields in the range of 88 to 99% were obtained. The purity of the Mab products were ascertained by …
Effect Of Co On No And N2o Conversions In Nonthermal Argon Plasma, Morris D. Argyle, Gui-Bing Zhao, Maciej Radosz
Effect Of Co On No And N2o Conversions In Nonthermal Argon Plasma, Morris D. Argyle, Gui-Bing Zhao, Maciej Radosz
Faculty Publications
200-600 ppm of CO inhibit NO conversion in nonthermal Ar plasma, but do not produce N2O. However, 1.01% of CO has no effect on NO conversion, but produces N2O. In general, N2O conversion in Ar plasma decreases with increasing CO concentration. These experimental results cannot be explained by charge transfer reactions of Ar+. Selectivity analysis of all excited states of Ar possibly contributing to NOX conversion without and with CO suggests that only AR(3P2) contributes to NOX conversion and CO dissociation. A kinetic model of 43 reactions is required to model NO Conversion or N2O conversion in Ar without CO, …
Co2-Selective Membranes Containing Amino Groups, W.S. Winston Ho
Co2-Selective Membranes Containing Amino Groups, W.S. Winston Ho
Chemical and Materials Engineering Faculty Patents
Novel compositions suitable for fabrication of CO2-selective membranes are disclosed. In one aspect, the present invention is directed to compositions comprising polyimide/polyamine blends and copolymers, and to compositions comprising interfacially polymerized polyamides. In another aspect this invention is directed to novel CO2-selective membranes comprising such polyimide/polyamine blends and copolymers, and to novel CO2-selective membranes comprising interfacially polymerized polyamides. In yet another aspect, the present invention is directed to a novel water-gas-shift (WGS) reactor comprising the novel CO2-selective membranes. Advantageously, the use of the novel CO2-selective membrane allows alteration of the …
Quantification Of Energy Consumption And Emissions Using Biodiesel In An Urban Bus Fleet, A. R. Branco, R. Silva, A Vasconcelos, T. L. Farias, L. T. Moura,
Quantification Of Energy Consumption And Emissions Using Biodiesel In An Urban Bus Fleet, A. R. Branco, R. Silva, A Vasconcelos, T. L. Farias, L. T. Moura,
Bioenergy - I: From Concept to Commercial Processes
No abstract provided.
Oleochemical Biofuel, Peter Reimers
Oleochemical Biofuel, Peter Reimers
Bioenergy - I: From Concept to Commercial Processes
No abstract provided.
Biogas Potential In Chile, Rolando Chamy, Elba Vivanco
Biogas Potential In Chile, Rolando Chamy, Elba Vivanco
Bioenergy - I: From Concept to Commercial Processes
No abstract provided.
Enhanced Profitability Through Technology, Integration And Diversification, Jeffrey Robert
Enhanced Profitability Through Technology, Integration And Diversification, Jeffrey Robert
Bioenergy - I: From Concept to Commercial Processes
No abstract provided.
Biorefinery Process Economics, Gregory M. Bohlmann
Biorefinery Process Economics, Gregory M. Bohlmann
Bioenergy - I: From Concept to Commercial Processes
No abstract provided.
Brick Furnaces – Hoffman Type: Technical Feasibility Of Incinerating Municipal Solid Wastes (Msw), Cesar Augusto Garcia U., Juan Carlos Moreno P.
Brick Furnaces – Hoffman Type: Technical Feasibility Of Incinerating Municipal Solid Wastes (Msw), Cesar Augusto Garcia U., Juan Carlos Moreno P.
Bioenergy - I: From Concept to Commercial Processes
No abstract provided.
Ethanol Processing Co-Products - Current Constraints And Future Directions, Kurt A. Rosentrater
Ethanol Processing Co-Products - Current Constraints And Future Directions, Kurt A. Rosentrater
Bioenergy - I: From Concept to Commercial Processes
No abstract provided.
Palm Fatty Acids Esterification On Heterogeneous Catalysis, Donato Aranda
Palm Fatty Acids Esterification On Heterogeneous Catalysis, Donato Aranda
Bioenergy - I: From Concept to Commercial Processes
No abstract provided.
Poster: Production Of Ethanol From Pretreated Maize Silage In Anaerobically Digested And Wet-Oxidized Manure As A Liquid Medium, Piotr Oleskowicz-Popiel, Jens Bo Holm-Nielsen
Poster: Production Of Ethanol From Pretreated Maize Silage In Anaerobically Digested And Wet-Oxidized Manure As A Liquid Medium, Piotr Oleskowicz-Popiel, Jens Bo Holm-Nielsen
Bioenergy - I: From Concept to Commercial Processes
No abstract provided.
Poster: Biomass Energy Priorities For Developing Nations, Henry R. Bungay
Poster: Biomass Energy Priorities For Developing Nations, Henry R. Bungay
Bioenergy - I: From Concept to Commercial Processes
No abstract provided.
Boosting The Cellulytic Degradation Of Steam Pretreated Barley Straw, Lisa Rosgaard
Boosting The Cellulytic Degradation Of Steam Pretreated Barley Straw, Lisa Rosgaard
Bioenergy - I: From Concept to Commercial Processes
No abstract provided.
Hansenula Polymorpha As A New Promising Organism For High Temperature Alcoholic Fermentation Of Lignocellulose Sugars, Andriy A. Sibirny
Hansenula Polymorpha As A New Promising Organism For High Temperature Alcoholic Fermentation Of Lignocellulose Sugars, Andriy A. Sibirny
Bioenergy - I: From Concept to Commercial Processes
No abstract provided.
H2 Production By Dark Fermentation From Food Wastes, Masamitsu Tomiyama
H2 Production By Dark Fermentation From Food Wastes, Masamitsu Tomiyama
Bioenergy - I: From Concept to Commercial Processes
No abstract provided.
Poster: Sequestration Of Carbon Dioxide With Simultaneous Production Of Succinic Acid By Metabolically Engineering Escherichia Coli, M. A. Eiteman, S. Lu, J. L. Buday, J. R. Kastner, E. Altman
Poster: Sequestration Of Carbon Dioxide With Simultaneous Production Of Succinic Acid By Metabolically Engineering Escherichia Coli, M. A. Eiteman, S. Lu, J. L. Buday, J. R. Kastner, E. Altman
Bioenergy - I: From Concept to Commercial Processes
No abstract provided.
Poster: Esterification Of Used Frying Oils With A High Content Of Free Fatty Acids Using Solid Resins, J.M. Marchetti, V.U. Miguel, A.F. Errazu
Poster: Esterification Of Used Frying Oils With A High Content Of Free Fatty Acids Using Solid Resins, J.M. Marchetti, V.U. Miguel, A.F. Errazu
Bioenergy - I: From Concept to Commercial Processes
No abstract provided.
Mixed Culture Fermentation For Bioenergy Production, Robbert Kleerebezem, Mark Cm Van Loosdrecht
Mixed Culture Fermentation For Bioenergy Production, Robbert Kleerebezem, Mark Cm Van Loosdrecht
Bioenergy - I: From Concept to Commercial Processes
No abstract provided.