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Multi-head neural networks for simulating particle breakage dynamics

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Theoretical & Applied Mechanics Letters 2024年第2期14卷 130-141页

作者： Abhishek Gupta Barada kanta Mishra School of Mechanical Sciences Indian Institute of Technology(IIT)GoaPonda 403401India School of Chemical and Materials Science Indian Institute of Technology(IIT)GoaPonda 403401India

The breakage of brittle particulate materials into smaller particles under compressive or impact loads can be modelled as an instantiation of the population balance integro-differential *** this paper,the emerging computational science paradigm of physics-informed neural networks is studied for the first time for solving both linear and nonlinear variants of the governing *** conventional methods,the proposed neural network provides rapid simulations of arbitrarily high resolution in particle size,predicting values on arbitrarily fine grids without the need for model *** network is assigned a simple multi-head architecture tailored to uphold monotonicity of the modelled cumulative distribution function over particle *** method is theoretically analyzed and validated against analytical results before being applied to real-world data of a batch grinding *** agreement between laboratory data and numerical simulation encourages the use of physics-informed neural nets for optimal planning and control of industrial comminution processes.

关键词： Particle breakage dynamics Population balance equation Physics-informed neural networks

Ultra-minimally invasive endoscopic techniques and colorectal diseases:Current status and its future

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Artificial Intelligence in Gastrointestinal Endoscopy 2024年第2期5卷 15-30页

作者： Nalini kanta Ghosh Ashok Kumar Department of Surgical Gastroenterology Sanjay Gandhi Post Graduate Institute of Medical SciencesLucknow 226014Uttar PradeshIndia

Colorectal diseases are increasing due to altered lifestyle,genetic,and environmental *** plays an important role in *** in colonoscope(ultrathin scope,magnetic scope,capsule)and technological gadgets(Balloon assisted scope,third eye retroscope,NaviAid G-EYE,dye-based chromoendoscopy,virtual chromoendoscopy,narrow band imaging,i-SCAN,etc.)have made colonoscopy more comfortable and *** in-vivo microscopy can be performed using confocal laser endomicroscopy,optical coherence tomography,spectroscopy,*** developments in diagnostic colonoscopy,therapeutic colonoscopy has improved to manage lower gastrointestinal tract bleeding,obstruction,perforations,resection polyps,and early colorectal *** introduction of combined endo-laparoscopic surgery and robotic endoscopic surgery has made these interventions *** role of artificial intelligence in the diagnosis and management of colorectal diseases is also increasing day by ***,this article is to review cutting-edge developments in endoscopic principles for the management of colorectal diseases.

关键词： Colorectal disorders Ultra-minimally invasive scopes Advanced gadgets Endoscopic intervention Combined endo-laparoscopic surgery

Roughness evaluation in shotcrete-lined water tunnels with invert concrete based on cases from Nepal

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Journal of Rock Mechanics and Geotechnical Engineering 2018年第1期10卷 42-59页

作者： Chhatra Bahadur Basnet Krishna kanta Panthi Department of Geosciences and Petroleum Norwegian University of Science and Technology

Most of the existing roughness estimation methods for water tunnels are related to either unlined or concrete/steel-lined tunnels. With the improvement in shotcrete technology, advancement in tunneling equipment and cost and time effectiveness, future water tunnels built for hydropower projects will consist of rock support with the extensive use of shotcrete lining in combination with systematic bolting and concrete lining in the tunnel invert. However, very little research has been performed to find out tunnel surface roughness for shotcrete-lined tunnels with invert concrete, which is important in calculating overall head loss along the waterway system to achieve an optimum and economic hydropower plant design. Hence, the main aim of this article is to review prevailing methods available to calculate tunnel wall roughness, and to use existing methods of head loss calculation to back-calculate roughness of the shotcrete-lined tunnels with invert concrete by exploiting measured head loss and actual cross-sectional profiles of two headrace tunnels from Nepal. Furthermore, the article aims to establish a link between the Manning coefficient and the physical roughness of the shotcrete-lined tunnel with invert concrete and to establish a link between over-break thickness and physical roughness. Attempts are also made to find a correlation between over-break thickness and rock mass quality described by Q-system and discussions are conducted on the potential cost savings that can be made if concrete lining is replaced by shotcrete lining with invert concrete.

关键词： Shotcrete-lined water tunnels Friction loss Physical and hydraulic roughnesses Tunnel over-break

Analysis of unlined pressure shafts and tunnels of selected Norwegian hydropower projects

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Journal of Rock Mechanics and Geotechnical Engineering 2018年第3期10卷 486-512页

作者： Chhatra Bahadur Basnet Krishna kanta Panthi Department of Geoscience and Petroleum Norwegian University of Science and Technology

Norwegian hydropower industry has more than 100 years of experiences in constructing more than4000 km-long unlined pressure shafts and tunnels with maximum static head of 1047 m（equivalent to almost 10.5 MPa） reached at unlined pressure tunnel of Nye Tyin project. Experiences gained from construction and operation of these unlined pressure shafts and tunnels were the foundation to develop design criteria and principles applied in Norway and some other countries. In addition to the confinement criteria, Norwegian state-of-the-art design principle for unlined pressure shaft and tunnel is that the minor principal stress at the location of unlined pressure shaft or tunnel should be more than the water pressure in the shaft or tunnel. This condition of the minor principal stress is prerequisite for the hydraulic jacking/splitting not to occur through joints and fractures in rock mass. Another common problem in unlined pressure shafts and tunnels is water leakage through hydraulically splitted joints or pre-existing open joints. This article reviews some of the first attempts of the use of unlined pressure shaft and tunnel concepts in Norway, highlights major failure cases and two successful cases of significance, applies Norwegian criteria to the cases and reviews and evaluates triggering factors for *** article further evaluates detailed engineering geology of failure cases and also assesses common geological features that could have aggravated the failure. The minor principal stress is investigated and quantified along unlined shaft and tunnel alignment of six selected project cases by using threedimensional numerical model. Furthermore, conditions of failure through pre-existing open joints by hydraulic jacking and leakage are assessed by using two-dimensional fluid flow analysis. Finally, both favorable and unfavorable ground conditions required for the applicability of Norwegian confinement criteria in locating the unlined pressure shafts and tunnels for ge

关键词： Hydropower projects Unlined pressure shafts and tunnels Minor principal stress Hydraulic jacking Water leakage

Evaluation of earthquake impact on magnitude of the minimum principal stress along a shotcrete lined pressure tunnel in Nepal

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Journal of Rock Mechanics and Geotechnical Engineering 2019年第5期11卷 920-934页

作者： Krishna kanta Panthi Chhatra Bahadur Basnet Department of Ceoscience and Petroleum Norwegian University of Science and Technology

In situ stress condition in rock mass is influenced by both tectonic activity and geological environment such as faulting and shearing in the rock *** influence is of significance in the Himalayan region,where the tectonic movement is active,resulting in periodic dynamic *** large-scale earthquake causes both accumulation and sudden release of strain energy,instigating changes in the in situ stress environment in the rock *** paper first highlights the importance of the magnitude of the minimum principal stress in the design of unlined or shotcrete lined pressure tunnel as water conveyance system used for hydropower *** we evaluated the influence of local shear faults on the magnitude of the minimum principal stress along the shotcrete lined high pressure tunnel of Upper Tamakoshi Hydroelectric Project(UTHP)in Nepal.A detailed assessment of the in situ stress state is carried out using both measured data and three-dimensional(3D)numerical analyses with ***,analysis is carried out on the possible changes in the magnitude of the minimum principal stress in the rock mass caused by seismic movement(dynamic loading).A permanent change in the stress state at and nearby the area of shear zones along the tunnel alignment is found to be an eminent process.

关键词： Shotcrete lined pressure tunnel The minimum principal stress Three-dimensional(3D)numerical model Geology Tectonic activity Himalaya

Automated stopping criterion for spectral measurements with active learning

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npj Computational Materials 2021年第1期7卷 1252-1260页

作者： Tetsuro Ueno Hideaki Ishibashi Hideitsu Hino kanta Ono Synchrotron Radiation Research Center Kansai Photon Science InstituteQuantum Beam Science Research DirectorateNational Institutes for Quantum and Radiological Science and TechnologySayoHyogoJapan Department of Human Intelligence Systems Graduate School of Life Science and Systems EngineeringKyushu Institute of TechnologyKitakyushuFukuokaJapan The Institute of Statistical Mathematics Research Organization of Information and SystemsTachikawaTokyoJapan Department of Applied Physics Graduate School of EngineeringOsaka UniversitySuitaOsakaJapan Center for Integrative Quantum Beam Science Institute of Materials Structure ScienceHigh Energy Accelerator Research OrganizationTsukubaIbarakiJapan

The automated stopping of a spectral measurement with active learning is *** optimal stopping of the measurement is realised with a stopping criterion based on the upper bound of the posterior average of the generalisation error of the Gaussian process *** is revealed that the automated stopping criterion of the spectral measurement gives an approximated X-ray absorption spectrum with sufficient accuracy and reduced data *** proposed method is not only a proof-of-concept of the optimal stopping problem in active learning but also the key to enhancing the efficiency of spectral measurements for highthroughput experiments in the era of materials informatics.

关键词： criterion spectral optimal

Settling characteristics of ultrafine iron ore slimes

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International Journal of Minerals,Metallurgy and Materials 2012年第2期19卷 95-99页

作者： Chinthapudi Eswaraiah Surendra Kumar Biswal Barada kanta Mishra Institute of Minerals and Materials Technology (IMMT) Council of Scientific and Industrial Research (CSIR) Bhubaneswar 751 013 India

The slurry settling characteristics are the most important to design a thickener in process industries. In this work, the iron ore slurry from the screw classifier overflow was used for the settling study. It was observed that the original slurry exhibited a low settling velocity and a turbid supernatant during the settling process. Commercial flocculating agents with anionic, cationic, and nonionic characters were used to improve the settling behavior of suspensions, which were added into the slurry at different ranges of slurry pH values, respectively. The settling results show that the use of flocculants increase the settling rate by several times. Compared with the cationic and non-ionic flocculants, the anionic flocculant is more effective in enhancing the slurry settling rate. The small dose of the anionic flocculant is found to be more effective, but the other flocculants are less effective even at higher dosages. The simulation of an industrial thickener was carried out based on the laboratory settling data, and the appropriate design and selection parameters of the industrial thickener were estimated.

关键词： iron ores dewatering flocculation thickener design

Construction of even-variable rotation symmetric Boolean functions with maximum algebraic immunity

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Science China(Information Sciences) 2013年第3期56卷 60-68页

作者： FU ShaoJing LI Chao MATSUURA kanta QU LongJiang Department of Mathematics and System Science National University of Defense Technology Institute of Industrial Science University of TokyoTokyo 153-8505Japan State Key Laboratory of Information Security Graduate University of Chinese Academy of Sciences

Rotation symmetric Boolean functions(RSBFs) have been used as components of different *** this paper,we investigate n-variable(n even and n≥12) RSBFs to achieve maximum algebraic immunity(AI),and provide a construction of RSBFs with maximum AI and *** functions have higher nonlinearity than the previously known nonlinearity of RSBFs with maximum *** also prove that our construction provides high algebraic degree in some case.

关键词： Boolean function rotation symmetry algebraic immunity nonlinearity

Sliding Mode Control of Coupled Tank Systems Using Conditional Integrators

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IEEE/CAA Journal of Automatica Sinica 2020年第1期7卷 118-125页

作者： Sankata Bhanjan Prusty Sridhar Seshagiri Umesh Chandra Pati Kamala kanta Mahapatra Department of Electronics and Communication Engineering Madanapalle Institute of Technology and ScienceMadanapalleAndhra Pradesh 517325India Department of Electrical and Computer Engineering San Diego State UniversitySan DiegoCA 92182 USA Department of Electronics and Communication Engineering National Institute of TechnologyRourkelaOdisha 769008India

For the problem of set point regulation of the liquid level in coupled tank systems, we present a continuous sliding mode control(SMC) with a "conditional integrator", which only provides integral action inside the boundary layer. For a special choice of the controller parameters, our design can be viewed as a PID controller with anti-windup and achieves robust *** proposed controller recovers the transient response performance without control chattering. Both full-state feedback as well as output-feedback designs are presented in this work. Our output-feedback design uses a high-gain observer(HGO) which recovers the performance of a state-feedback design where plant parameters are assumed to be known. We consider both interacting as well as non-interacting tanks and analytical results for stability and transient performance are presented in both the cases. The proposed controller continuous SMC with conditional integrators(CSMCCI) provides superior results in terms of the performance measures as well as performance indices than ideal SMC, continuous SMC(CSMC) and continuous SMC with conventional integrator(CSMCI). Experimental results demonstrate good tracking performance in spite of unmodeled dynamics and disturbances.

关键词： Conditional integrator coupled tank system LabVIEW sliding mode control