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Kotte, Madhusudhana Rao,Kuvarega, Alex T.,Cho, Manki,Mamba, Bhekie B.,Diallo, Mamadou. S. American Chemical Society 2015 Environmental science & technology Vol.49 No.16
<P>Advances in industrial ecology, desalination, and resource recovery have established that industrial wastewater, seawater, and brines are important and largely untapped sources of critical metals and elements. A <I>Grand Challenge</I> in metal recovery from industrial wastewater is to design and synthesize high capacity, recyclable and robust chelating ligands with tunable metal ion selectivity that can be efficiently processed into low-energy separation materials and modules. In our efforts to develop high capacity chelating membranes for metal recovery from impaired water, we report a one-pot method for the preparation of a new family of mixed matrix polyvinylidene fluoride (PVDF) membranes with in situ synthesized poly(amidoamine) [PAMAM] particles. The key feature of our new membrane preparation method is the in situ synthesis of PAMAM dendrimer-like particles in the dope solutions prior to membrane casting using low-generation dendrimers (G0 and G1-NH<SUB>2</SUB>) with terminal primary amine groups as precursors and epichlorohydrin (ECH) as cross-linker. By using a combined thermally induced phase separation (TIPS) and nonsolvent induced phase separation (NIPS) casting process, we successfully prepared a new family of asymmetric PVDF ultrafiltration membranes with (i) neutral and hydrophilic surface layers of average pore diameters of 22–45 nm, (ii) high loadings (∼48 wt %) of dendrimer-like PAMAM particles with average diameters of ∼1.3–2.4 μm, and (iii) matrices with sponge-like microstructures characteristics of membranes with strong mechanical integrity. Preliminary experiments show that these new mixed matrix PVDF membranes can serve as high capacity sorbents for Cu(II) recovery from aqueous solutions by ultrafiltration.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/esthag/2015/esthag.2015.49.issue-16/acs.est.5b01594/production/images/medium/es-2015-01594n_0010.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/es5b01594'>ACS Electronic Supporting Info</A></P>
REVERSE EDGE MAGIC LABELING OF CARTESIAN PRODUCT, UNIONS OF BRAIDS AND UNIONS OF TRIANGULAR BELTS
REDDY, KOTTE AMARANADHA,BASHA, S. SHARIEF The Korean Society for Computational and Applied M 2022 Journal of applied mathematics & informatics Vol.40 No.1-2
Reverse edge magic(REM) labeling of the graph G = (V, E) is a bijection of vertices and edges to a set of numbers from the set, defined by λ : V ∪ E → {1, 2, 3, …, |V| + |E|} with the property that for every xy ∈ E, constant k is the weight of equals to a xy, that is λ(xy) - [λ(x) + λ(x)] = k for some integer k. We given the construction of REM labeling for the Cartesian Product, Unions of Braids and Unions of Triangular Belts. The Kotzig array used in this paper is the 3 × (2r + 1) kotzig array. we test the konow results about REM labelling that are related to the new results we found.
Hari Babu Kotte,Radhika Ambatipudi,Kent Bertilsson 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
In this paper, design and analysis of the high speed isolated cascode flyback converter using multilayered coreless PCB step down power transformer is presented. The converter is tested for the input voltage variation of 60-120V with a nominal DC input voltage of 90V. The designed converter was simulated and tested successfully up to the output power level of 30W within the switching frequency range of 2.6-3.7㎒. The cascode flyback converter is compared with the single switch flyback converter in terms of operating frequency, gate drive power consumption, conduction losses and stresses on MOSFETs. The maximum energy efficiency of the cascode converter is approximately 81% with a significant improvement of about 3-4% compared to single switch flyback converter. The gate drive power consumption which is more dominant compared to conduction losses of the cascode converter using GaN MOSFET is found to be negligible compared to single switch flyback converter.
Radhika Ambatipudi,Hari Babu Kotte,Kent Bertilsson 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
This paper addresses radiated EMI issues in Coreless PCB step-down transformers used for power transfer applications. In case of SMPS circuits, since the waveforms are not sinusoidal in nature, most of the radiated emissions are not only from fundamental frequency component but also from harmonic contents. According to antenna theory, radiated EMI for three different power transformers of different radii were estimated for fundamental frequency of 2㎒ to 300㎒. The computations were made for both sinusoidal and square wave excitations and at a load power of 20W. The calculated radiated power obtained for simulated waveforms and for practical measured current waveforms are in good agreement with each other up to certain bandwidth. These computational results confirm that radiated power can be reduced in three layered 2:1 transformer compared to two layered 2:1 transformer. Also the radiated emissions are negligible in case of sinusoidal excitations compared to square wave excitations.
Nobuyuki Iwatsuki,Takanori Kotte,Koichi Morikawa 대한기계학회 2010 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.24 No.1
This paper describes the position and stiffness control of planar redundant link mechanisms with elastic elements in order to utilize the flexibility of robots. Assigning both of the two-dimensional position and stiffness of an output link as an output vector, the procedure of the forward kineto-static analysis for the planar redundant link mechanisms with elastic elements is formulated. The mechanisms have elastic linearactuators composed of a coil spring and linearactuator and rotary actuators and multi jointed links. An inverse kineto-static analysis to obtain the optimum input motions which can generate the desired position and stiffness of the output link while taking into account the motion range of the linearactuator is also conducted and applied to the optimum motion control of the mechanism. Several simulations and experiments with a prototype of a planar closed-loop manipulator with 5 DOF and 4 output show the effectiveness of the proposed method.
A. Majid,H.B.Kotte,J.Saleem,R.Ambatipudi,S.Haller,K.Bertilsson 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
This paper introduces high frequency half bridge DC-DC converter, using multilayered coreless Printed Circuit Board (PCB) step down power transformer. The converter is simulated and then implemented on a PCB. Complementary Pulse Width Modulated (PWM) signals are generated to turn on high and low side Metal Oxide Semiconductor Field Effect Transistors (MOSFETs) alternately by a micro-controller. The isolated gate drive signals are provided to the high side MOSFET by using high frequency coreless PCB isolation transformer. We tested the converter for switching frequency range of 2 to 3 ㎒, and for maximum input voltage up-to 170 V. The maximum output power achieved is 40 W and the maximum energy efficiency is approximately 82 %.
Mining Critical Metals and Elements from Seawater: Opportunities and Challenges
Diallo, Mamadou S.,Kotte, Madhusudhana Rao,Cho, Manki American Chemical Society 2015 Environmental science & technology Vol.49 No.16
<P>The availability and sustainable supply of technology metals and valuable elements is critical to the global economy. There is a growing realization that the development and deployment of the clean energy technologies and sustainable products and manufacturing industries of the 21st century will require large amounts of critical metals and valuable elements including rare-earth elements (REEs), platinum group metals (PGMs), lithium, copper, cobalt, silver, and gold. Advances in industrial ecology, water purification, and resource recovery have established that seawater is an important and largely untapped source of technology metals and valuable elements. This feature article discusses the opportunities and challenges of mining critical metals and elements from seawater. We highlight recent advances and provide an outlook of the future of metal mining and resource recovery from seawater.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/esthag/2015/esthag.2015.49.issue-16/acs.est.5b00463/production/images/medium/es-2015-004638_0008.gif'> <P>The availability and sustainable supply of technology metals and valuable elements is critical to the global economy. There is a growing realization that the development and deployment of the clean energy technologies and sustainable products and manufacturing industries of the 21st century will require large amounts of critical metals and valuable elements including rare-earth elements (REEs), platinum group metals (PGMs), lithium, copper, cobalt, silver, and gold. Advances in industrial ecology, water purification, and resource recovery have established that seawater is an important and largely untapped source of technology metals and valuable elements. This feature article discusses the opportunities and challenges of mining critical metals and elements from seawater. We highlight recent advances and provide an outlook of the future of metal mining and resource recovery from seawater.</P></P>
Portable Wireless Sensor for Visual Activity Measurement
( Aravind Ajay ),( Samanth Varma Kotte ),( Bhanupriya Dandumahanti ),( Murali Subramaniyam ) 한국감성과학회 2023 한국감성과학회 국제학술대회(ICES) Vol.2023 No.-
This research work reveals the possibility of measuring Visual fatigue parameters in a portable wireless approach. Confronted the challenge through the process of designing, material selection, choosing Operational mechanism, utilizing 3D printing, coding, and assembly. A universally adaptable elastic mobile case has been designed to accommodate various orientations and it incorporates a precisely designed module comprising of a Raspberry Pi 4B, a Lithium-ion battery, power source, an efficient heat venting fan, all securely affixed to the rear side of the case. The program is created, tested and results were obtained through inbuilt Realtek integrated camera and finally code transferred into the raspberry pi and measured using IR camera for high range and precise parameter measurement. In addition to primary objectives, cost reduction is another integral goal of this project. This project holds significant potential for the advancement of visual health and will be benefited to the society.