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Scalable orthogonal delay-division multiplexed OEO artificial neural network trained for TI-ADC equalization

Photonics Research 2024年第1期12卷 85-105页

作者： ANDREA ZAZZI arka dipta das LUKAS HüSSEN RENATO NEGRA JEREMY WITZENS Institute of Integrated Photonics RWTH Aachen University52074 AachenGermany Chair of High-Frequency Electronics RWTH Aachen University52074 AachenGermany

We propose a new signaling scheme for on-chip optical-electrical-optical artificial neural networks that utilizes orthogonal delay-division multiplexing and pilot-tone-based self-homodyne *** scheme offers a more efficient scaling of the optical power budget with increasing network *** simulations,based on220 nm silicon-on-insulator silicon photonics technology,suggest that the network can support 31×31 neurons,with 961 links and freely programmable weights,using a single 500 m W optical comb and a signal-to-noise ratio of 21.3 d B per ***,it features a low sensitivity to temperature fluctuations,ensuring that it can be operated outside of a laboratory *** demonstrate the network’s effectiveness in nonlinear equalization tasks by training it to equalize a time-interleaved analog-to-digital converter(ADC)architecture,achieving an effective number of bits over 4 over the entire 75 GHz ADC *** anticipate that this network architecture will enable broadband and low latency nonlinear signal processing in practical settings such as ultra-broadband data converters and real-time control systems.

关键词： network delay artificial

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Evaluation of load transfer mechanism under axial loads in a novel coupler of dual height rock bolts

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International Journal of Mining Science and Technology 2021年第2期31卷 225-232页

作者： Ranjan Kumar Prabhat Kumar Mandal Ashish Narayan arka Jyoti das CSIR-Central Institute of Mining and Fuel Research DhanbadJharkhand 826015India Chaibasa Engineering College KelendeJharkhand 833201India

The effective reinforcement of two or more overlying layers of mine openings in a single installation is usually done by coupling of two standard rock bolts mainly during the extraction of medium-thick coal ***,field observations show that the couplers of multiple bolts often degrade or break mostly at their *** types of failures can be avoided by strengthening the couplers of such multi-bolts *** achieve this,a novel threaded coupler system with an expansion shell was suggested in this *** newly designed coupler consists of a threaded tapered-plug-cumconnector with an expansion shell for connecting and tightening two standard rock *** analytical model for evaluating the load distribution along the coupler subject to axial load was *** analysis was performed to analyse the load transfer,deformation,and strains across the coupler including the factor of safety for the bolt-coupler-resin and bolt-coupler-expansion *** results validated the analytical model of the proposed coupler design,which provides better anchorage near the interface of the host rock ***,the developed coupler design would reduce the failures of the proposed coupler and stabilize laminated roof strata above the medium-thick coal seams in underground mines.

关键词： Roof rock reinforcement Dual height rock bolts Rock bolt coupler Expansion shell Underground mining Laminated roof strata

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Extraction of locked-up coal by strengthening of rib pillars with FRP--A comparative study through numerical modelling

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International Journal of Mining Science and Technology 2017年第2期27卷 261-267页

作者： das arka Jyoti Mandal Prabhat Kumar Ghosh Chandra Nath Sinha Amalendu CSIR-Central Institute of Mining and Fuel Research Dhanbad 826001India

In some of the coalfields in India, coal seams are only developed but no extraction of pillars is possible due to the presence of surface or sub-surface structures and also non-availability of stowing materials which leads to huge amounts of coal being locked-up underground. Spontaneous heating and fire, accumulation of poisonous gases, severe stability issues leading to unsafe workings and environmental hazards are the major problems associated with the developed coal pillars. So, there is a pressing need for a technology for the mining industry to extract the huge amount of coal locked-up under different constraints. In this study, the locked-up coal is proposed to be extracted by artificially strengthening the rib pillars. The detailed comparative study is carried out to know the increase of extraction percentage of locked-up coal by strengthening the rib pillars with FRP. Extraction methodology is designed and studied through numerical modelling for its stability analysis to evaluate its suitability of application in underground.

关键词： Locked-up coal Confined core Yield criterion Strengthened rib pillar Strain softening

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Adaptive Processing Gain Data Services in Cellular CDMA in Presence of Soft Handoff with Truncated ARQ

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International Journal of Communications, Network and System Sciences 2009年第2期2卷 155-162页

作者： dipta das Sumit KUNDU Department of Electronics & Communication Engg Dr. B. C. Roy Engg College Durgapur India Department of Electronics & Communication Engg National Institute of Technology Durgapur India

An adaptive data transmission scheme based on variable spreading gain (VSG) is studied in cellular CDMA network in presence of soft handoff (HO). The processing gain is varied according to traffic intensity meet-ing a requirement on data bit error rate (BER). The overall performance improvement due to processing gain adaptation and soft HO is evaluated and compared with a fixed rate system. The influence of soft HO pa-rameters on rate adaptation and throughput and delay performance of data is indicated. Further truncated automatic repeat request (T-ARQ) is used in link layer to improve the performance of delay sensitive ser-vices. The joint impact of VSG based transmission in presence of soft handoff at physical layer and T-ARQ at link layer is evaluated. A variable packet size scheme is also studied to meet a constraint on packet loss.

关键词： Adaptive Systems Variable Spreading Gain Soft Handoff ARQ

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Real-Time Thermomechanical Modeling of PV Cell Fabrication via a POD-Trained RBF Interpolation Network

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Computer Modeling in Engineering & Sciences 2020年第3期122卷 757-777页

作者： arka das Anthony Khoury Eduardo Divo Victor Huayamave AndresCeballos Ron Eaglin Alain Kassab Adam Payne Vijay Yelundur Hubert Seigneur Embry-Riddle Aeronautical University Department of Mechanical Engineering1 Aerospace Blvd.Daytona BeachFL 32114USA. Central Technological Corporation LongwoodFL 32779USA. University of Central Florida Department of Mechanical and Aerospace Engineering4000 Central Florida Blvd.OrlandoFL 32816USA. Suniva Inc. 5765 Peachtree Industrial Blvd.NorcrossGA 30092USA. Florida Solar Energy Center University of Central FloridaCocoa BeachFL 32922USA.

This paper presents a numerical reduced order model framework to simulate the physics of the thermomechanical processes that occur during c-Si photovoltaic(PV)cell fabrication.A response surface based on a radial basis function(RBF)interpolation network trained by a Proper Orthogonal Decomposition(POD)of the solution fields is developed for fast and accurate approximations of thermal loading conditions on PV cells during the fabrication *** outcome is a stand-alone computational tool that provides,in real time,the quantitative and qualitative thermomechanical response as a function of user-controlled input parameters for fabrication processes with the precision of 3D finite element analysis(FEA).This tool provides an efficient and effective avenue for design and optimization as well as for failure prediction of PV cells.

关键词： Silicon wafers photovoltaic cell contact firing proper orthogonal decomposition radial basis functions.

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Excess adsorption of biomolecules on soft surfaces: Adsorption of DNA, proteins and lactose on fatty surfaces

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Advances in Biological Chemistry 2013年第1期3卷 40-47页

作者： dipta Shani Dutta Dipti Kumar Chattoraj Parimal Chattopadhyay Kali P. das Department of Chemistry Bose Institute Kolkata India Department of Food Technology & Biochemical Engineering Jadavpur University Kolkata India

Insoluble fatty surfaces are involved in many important interactions such as in biomembranes with soluble biological macro and micromolecules. In this paper we have studied the adsorption interaction of aqueous solution of DNA, some proteins and lactose on several sparingly soluble fatty substances namely milk fat, stearic acid, palmitic acid, phosphatidyl choline and cholesterol surfaces by measuring the depletion of the adsorbates by analytical methods. Adsorption () of DNA on the soft surfaces of stearic acid, milk fat, phosphatidyl choline, palmitic acid and cholesterol was measured as a function of DNA concentration C2. In each case was found to increase with C2 until it reached the maximum value at a critical concentration . For different surfaces stands in the order: stearic acid > milk fat > phosphatidyl choline > cholesterol > palmitic acid. DNA forms multilayers on stearic acid surface. Adsorption of hemoglobin on cholesterol surface is found to be negative or zero but that of BSA on cholesterol is positive. Adsorption of gelatin on cholesterol surface is significantly higher than that of BSA. Lysozyme on cholesterol surface forms multilayers and on casein forms bilayer. The lowering of free energies ?DGo for all systems have been calculated using integrated form of the Gibbs adsorption and their values have been compared with each other. It is concluded that despite differences in the adsorption behavior of the biomolecules on various soft surfaces, free energy change expressed as Bull’s free energy change (Δ) remain nearly constant except for BSA-fatty acid interaction which may be likely due a specific interaction.

关键词： Excess Adsorption Surface Adsorption of Biomolecules Soft Surfaces Adsorption on Soft Surfaces DNA Globular Proteins

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