Alarm flood is one of the main problems in the alarm systems of industrial process. Alarm root-cause analysis and alarm prioritization are good for alarm flood reduction. This paper proposes a systematic rationalizati...Alarm flood is one of the main problems in the alarm systems of industrial process. Alarm root-cause analysis and alarm prioritization are good for alarm flood reduction. This paper proposes a systematic rationalization method for multivariate correlated alarms to realize the root cause analysis and alarm prioritization. An information fusion based interpretive structural model is constructed according to the data-driven partial correlation coefficient calculation and process knowledge modification. This hierarchical multi-layer model is helpful in abnormality propagation path identification and root-cause analysis. Revised Likert scale method is adopted to determine the alarm priority and reduce the blindness of alarm handling. As a case study, the Tennessee Eastman process is utilized to show the effectiveness and validity of proposed approach. Alarm system performance comparison shows that our rationalization methodology can reduce the alarm flood to some extent and improve the performance.展开更多
Based on the remote sensing images of algae, the present work analyzes the horizontal distribution characteristics of algal blooms in Chaohu Lake, China, which also reveals the frequency of algal blooms under differen...Based on the remote sensing images of algae, the present work analyzes the horizontal distribution characteristics of algal blooms in Chaohu Lake, China, which also reveals the frequency of algal blooms under different wind directions. Further, an unstructured-grid, three-dimensional finite-volume coastal ocean model （FVCOM） is applied to investigate the wind-induced currents and the transport pro- cess to explain the reason why algal blooms occur at the detected places. We first deduce the primary distribution of biomass from overlaid satellite images, and explain the formation mechanism by analyzing the pollution sources, and simulating the flow field and transportation process under prevailing wind over Chaohu Lake. And then, we consider the adjustment action of the wind on the corresponding day and develop a two-time scale approach to describe the whole formation process of algae horizontal distribution in Chaohu Lake. That is, on the longer time scale, i.e., during bloom season, prevailing wind determines the primary distribution of biomass by inducing the characteristic flow field; on the shorter time scale, i.e., on the day when bloom occurs, the wind force adjusts the primary distribution of biomass to form the final distribution of algal bloom.展开更多
Ce-substituted lithium ferrite, Li0.5CexFe2.5-x04 （x = 0, 0.05 and 0.1 ） compositions were synthesized from metal nitrates and citric acid by the solution combustion process by keeping the oxidizer to fuel ratio at ...Ce-substituted lithium ferrite, Li0.5CexFe2.5-x04 （x = 0, 0.05 and 0.1 ） compositions were synthesized from metal nitrates and citric acid by the solution combustion process by keeping the oxidizer to fuel ratio at unity. The thermal decomposition process was investigated by thermogravimetry-differential thermal analysis, which showed a stable phase formation above 600 ℃. The phase composition and molecular bonding of Li0.5CexFe2.5_x04 were characterized by X-ray powder diffraction analysis and Fourier transform infrared spectroscopy, respectively. An extensive study of electrical relaxation process has been represented with impedance and modulus as a function of frequency at different temperatures. The activation energy obtained from both the formalisms was found to be equal within the error. The dc conductivity and hopping frequency were thermally activated and their activation energies were found to be in the range of 0.69-0.64 eV for x = 0.05. The scaling of modulus and impedance were used to understand the electrical relaxation behaviour of the compositions and they suggest the time temperature superposition principle.展开更多
On-chip interconnect buses consume tens of percents of dynamic power in a nanometer scale integrated circuit and they will consume more power with the rapid scaling down of technology size and continuously rising cloc...On-chip interconnect buses consume tens of percents of dynamic power in a nanometer scale integrated circuit and they will consume more power with the rapid scaling down of technology size and continuously rising clock frequency, therefore it is meaningful to lower the interconnecting bus power in design. In this paper, a simple yet accurate interconnect parasitic capacitance model is presented first and then, based on this model, a novel interconnecting bus optimization method is proposed. Wire spacing is a process for spacing wires for minimum dynamic power, while wire ordering is a process that searches for wire orders that maximally enhance it. The method, i.e., combining wire spacing with wire ordering, focuses on bus dynamic power optimization with a consideration of bus performance requirements. The optimization method is verified based on various nanometer technology parameters, showing that with 50% slack of routing space, 25.71% and 32.65% of power can be saved on average by the proposed optimization method for a global bus and an intermediate bus, respectively, under a 65-nm technology node, compared with 21.78% and 27.68% of power saved on average by uniform spacing technology. The proposed method is especially suitable for computer-aided design of nanometer scale on-chip buses.展开更多
The recent GMP （good medical practice） rules actualisation and its requirements introduction widened the GMP guidelines for every life cycle of medicinal products, including the stage of processes scaling and techno...The recent GMP （good medical practice） rules actualisation and its requirements introduction widened the GMP guidelines for every life cycle of medicinal products, including the stage of processes scaling and technology transfer. This requires the technology transfer process to be regulated as the part of pharmaceutical quality system and the following development of corresponding written procedures. The following publication is dedicated to the development of TTP （technology transfer process） and its accessible graphic formalisation alongside the definition of main stages and possible procedures limited by the offered model. According to the actualized GMP rules, the technology transfer is an essential part of pharmaceutical quality system at a modem pharmaceutical company.展开更多
With the advent of the fourth technological revolution,the new generation of artificial intelligence(AI)has imparted new significance and opportunities to the modeling of momentum,heat,and mass transfer,as well as che...With the advent of the fourth technological revolution,the new generation of artificial intelligence(AI)has imparted new significance and opportunities to the modeling of momentum,heat,and mass transfer,as well as chemical reaction processes with the realm of chemical engineering.AI techniques are being widely employed in the chemical industry and are constantly evolving to offer more effective solutions for tackling practical challenges.This review delves the transformation of the chemical industry from traditional digital simulations to advanced AI-based approaches,targeting high efficiency and low carbon emissions across the scale from molecules to factories.Particular emphasis is mainly placed on the research carried out within the research group of Weifeng Shen.At the molecular level,the intelligent capture of molecular characteristics and the precise determination of structure-property relationships have reached a mature stage.Furthermore,multifunction-driven reverse molecular design for solvents,reaction reagents,and other substances has been accomplished through AI-based high-throughput screening and generative models.To improve the safety,environmental friendliness,and carbon reduction performance of chemical separation processes,a series of innovative reinforcement strategies have been put forward,with a primary focus on the systematic optimization of solvent design.On the process scale of actual production,it frequently occurs that the constructed mechanism model fails to align with the actual system behavior,thereby restricting the industrial application of the model.To solve this issue,mechanism-data hybrid-driven frameworks have been successfully developed,leveraging AI-enhanced prediction,diagnosis,optimization,and control for complex separation systems in practice.Finally,as a bridge connecting big data intelligent technology and actual industrial processes,dynamic digital twin modeling is discussed for its potential to boost efficiency and sustainability in the chemical industry.展开更多
A new algorithm of measurement slub yarn parameter was put forward to improve precision and efficient. The basic principal of measurement slub yarn by parallel-plate capacitor was introduced,and slub yarns were tested...A new algorithm of measurement slub yarn parameter was put forward to improve precision and efficient. The basic principal of measurement slub yarn by parallel-plate capacitor was introduced,and slub yarns were tested with a measurement system developed by ourselves. Time sequence for slub length and slub space can be got. And distributions of slub length,slub space and slub scaling factor can also be obtained. The agreement can be attained compared with those original settings. Some error was analyzed also. Consequently this system is effective,and can be adopted in practice.展开更多
It is seriously interfered by ship noise when analyzing and extracting broadband spark sound source signal. In the energy concentrated domain which is below 5 kHz, the traditional scale correlation filtering algorithm...It is seriously interfered by ship noise when analyzing and extracting broadband spark sound source signal. In the energy concentrated domain which is below 5 kHz, the traditional scale correlation filtering algorithm, which is based on adjacent-scale correlation, has limited anti-interference ability due to the low signal-to-noise ratio （SNR） and similar Lipschitz exponent characteristic of each other. However, because different frequency bands of the broadband electric spark signal have different noise interferences, the filtering algorithm based on adjacent-scale correlation is adapted to high SNR and small-scale high-frequency wavelet coefficients filtering; the filtering algorithm based on cross-scale correlation is adapted to low SNR and large-scale low-frequency wavelet coefficients filtering, and the threshold coefficient selection method had been corrected in the algorithm. It is shown that the filtering algorithm has a good filtering effect and extracts the broadband spark sound source signal effectively; it is applicable to broadband underwater acoustic signM processing in the presence of narrow-band strong interference background noise.展开更多
Based on the three-term decomposition model for turbulent flows, the fundamental equations for quasi-periodic motions are obtained, and the approximate analytical solutions of these second-order nonlinear partial diff...Based on the three-term decomposition model for turbulent flows, the fundamental equations for quasi-periodic motions are obtained, and the approximate analytical solutions of these second-order nonlinear partial differential equations are derived by using the match method. The effects on the mo- mentum, heat and mass transport processes in the wall turbulent flows can be estimated approximately.展开更多
Geological Society Special Publications No.253,London,2006,456 pp.,Price List:£85.00,US$170 ISBN 1-86239-191-2 Earth science began with the observation of the Earth materials and processes,then asking specific qu...Geological Society Special Publications No.253,London,2006,456 pp.,Price List:£85.00,US$170 ISBN 1-86239-191-2 Earth science began with the observation of the Earth materials and processes,then asking specific questions,proposing and testing hypotheses,formulating general concepts and theories,and finally experimenting and modelling.On a larger scale,this has been the pattern of Earth science history;and on a smaller scale this also is how a comprehensive Earth science research project proceeds.Experimentation,modelling and simulation are relatively recent developments in Earth science,and in this regard Earth scientists have a long way to go compared with their colleagues in physics and chemistry.But serious steps have been taken in recent decades.This new book is a testimony to these developments in the field of tectonic modelling.展开更多
Correction:Systems Microbiology and Biomanufacturing https://doi.org/10.1007/s43393-023-00197-w In the original article,the author name‘Emmanuel Olusola Oke’was given incorrectly as'Olushola E.Oke'.The origi...Correction:Systems Microbiology and Biomanufacturing https://doi.org/10.1007/s43393-023-00197-w In the original article,the author name‘Emmanuel Olusola Oke’was given incorrectly as'Olushola E.Oke'.The origi-nal article has been corrected.展开更多
基金Supported by the National Natural Science Foundation of China(61473026,61104131)the Fundamental Research Funds for the Central Universities(JD1413)
文摘Alarm flood is one of the main problems in the alarm systems of industrial process. Alarm root-cause analysis and alarm prioritization are good for alarm flood reduction. This paper proposes a systematic rationalization method for multivariate correlated alarms to realize the root cause analysis and alarm prioritization. An information fusion based interpretive structural model is constructed according to the data-driven partial correlation coefficient calculation and process knowledge modification. This hierarchical multi-layer model is helpful in abnormality propagation path identification and root-cause analysis. Revised Likert scale method is adopted to determine the alarm priority and reduce the blindness of alarm handling. As a case study, the Tennessee Eastman process is utilized to show the effectiveness and validity of proposed approach. Alarm system performance comparison shows that our rationalization methodology can reduce the alarm flood to some extent and improve the performance.
基金supported by the Hundred Talents Program of Chinese Academy of Sciencesthe National Natural Science Fundation of China for Distinguished Young Scholar(10825211)
文摘Based on the remote sensing images of algae, the present work analyzes the horizontal distribution characteristics of algal blooms in Chaohu Lake, China, which also reveals the frequency of algal blooms under different wind directions. Further, an unstructured-grid, three-dimensional finite-volume coastal ocean model （FVCOM） is applied to investigate the wind-induced currents and the transport pro- cess to explain the reason why algal blooms occur at the detected places. We first deduce the primary distribution of biomass from overlaid satellite images, and explain the formation mechanism by analyzing the pollution sources, and simulating the flow field and transportation process under prevailing wind over Chaohu Lake. And then, we consider the adjustment action of the wind on the corresponding day and develop a two-time scale approach to describe the whole formation process of algae horizontal distribution in Chaohu Lake. That is, on the longer time scale, i.e., during bloom season, prevailing wind determines the primary distribution of biomass by inducing the characteristic flow field; on the shorter time scale, i.e., on the day when bloom occurs, the wind force adjusts the primary distribution of biomass to form the final distribution of algal bloom.
基金Financial support from the UGC-SAP F.530/15/DRS/2009
文摘Ce-substituted lithium ferrite, Li0.5CexFe2.5-x04 （x = 0, 0.05 and 0.1 ） compositions were synthesized from metal nitrates and citric acid by the solution combustion process by keeping the oxidizer to fuel ratio at unity. The thermal decomposition process was investigated by thermogravimetry-differential thermal analysis, which showed a stable phase formation above 600 ℃. The phase composition and molecular bonding of Li0.5CexFe2.5_x04 were characterized by X-ray powder diffraction analysis and Fourier transform infrared spectroscopy, respectively. An extensive study of electrical relaxation process has been represented with impedance and modulus as a function of frequency at different temperatures. The activation energy obtained from both the formalisms was found to be equal within the error. The dc conductivity and hopping frequency were thermally activated and their activation energies were found to be in the range of 0.69-0.64 eV for x = 0.05. The scaling of modulus and impedance were used to understand the electrical relaxation behaviour of the compositions and they suggest the time temperature superposition principle.
基金Project supported by the National Natural Science Foundation of China (Grant Nos. 60725415, 60971066, and 61006028)the National High-Tech Program of China (Grant Nos. 2009AA01Z258 and 2009AA01Z260)the National Key Lab Foundation,China (Grant No. ZHD200904)
文摘On-chip interconnect buses consume tens of percents of dynamic power in a nanometer scale integrated circuit and they will consume more power with the rapid scaling down of technology size and continuously rising clock frequency, therefore it is meaningful to lower the interconnecting bus power in design. In this paper, a simple yet accurate interconnect parasitic capacitance model is presented first and then, based on this model, a novel interconnecting bus optimization method is proposed. Wire spacing is a process for spacing wires for minimum dynamic power, while wire ordering is a process that searches for wire orders that maximally enhance it. The method, i.e., combining wire spacing with wire ordering, focuses on bus dynamic power optimization with a consideration of bus performance requirements. The optimization method is verified based on various nanometer technology parameters, showing that with 50% slack of routing space, 25.71% and 32.65% of power can be saved on average by the proposed optimization method for a global bus and an intermediate bus, respectively, under a 65-nm technology node, compared with 21.78% and 27.68% of power saved on average by uniform spacing technology. The proposed method is especially suitable for computer-aided design of nanometer scale on-chip buses.
文摘The recent GMP （good medical practice） rules actualisation and its requirements introduction widened the GMP guidelines for every life cycle of medicinal products, including the stage of processes scaling and technology transfer. This requires the technology transfer process to be regulated as the part of pharmaceutical quality system and the following development of corresponding written procedures. The following publication is dedicated to the development of TTP （technology transfer process） and its accessible graphic formalisation alongside the definition of main stages and possible procedures limited by the offered model. According to the actualized GMP rules, the technology transfer is an essential part of pharmaceutical quality system at a modem pharmaceutical company.
基金support provided by the National Natural Science Foundation of China(Grant No.22278044)the Chongqing Science Fund for Distinguished Young Scholars(Grant No.CSTB2022NSCQ-JQX0021)+5 种基金the Fundamental Research Funds for the Central Universities(Grant No.2024IAIS-QN004)the Chongqing Innovation Support Key Program for Returned Overseas Chinese Scholars(Grant No.CX2023002)the Key Project of Technical Innovation and Application Development(Grant No.CSTB2024TIAD-KPX0058)the Science and Technology Innovation Key R&D Program of Chongqing(Grant No.CSTB2024TIAD-STX0032)the Xinjiang Autonomous Region Regional Collaborative Innovation Special Science and Technology Assistance Plan Project(Grant No.2024E02036)the Open Research Project of the State Key Laboratory of Industrial Control Technology,China(Grant No.ICT2024B01).
文摘With the advent of the fourth technological revolution,the new generation of artificial intelligence(AI)has imparted new significance and opportunities to the modeling of momentum,heat,and mass transfer,as well as chemical reaction processes with the realm of chemical engineering.AI techniques are being widely employed in the chemical industry and are constantly evolving to offer more effective solutions for tackling practical challenges.This review delves the transformation of the chemical industry from traditional digital simulations to advanced AI-based approaches,targeting high efficiency and low carbon emissions across the scale from molecules to factories.Particular emphasis is mainly placed on the research carried out within the research group of Weifeng Shen.At the molecular level,the intelligent capture of molecular characteristics and the precise determination of structure-property relationships have reached a mature stage.Furthermore,multifunction-driven reverse molecular design for solvents,reaction reagents,and other substances has been accomplished through AI-based high-throughput screening and generative models.To improve the safety,environmental friendliness,and carbon reduction performance of chemical separation processes,a series of innovative reinforcement strategies have been put forward,with a primary focus on the systematic optimization of solvent design.On the process scale of actual production,it frequently occurs that the constructed mechanism model fails to align with the actual system behavior,thereby restricting the industrial application of the model.To solve this issue,mechanism-data hybrid-driven frameworks have been successfully developed,leveraging AI-enhanced prediction,diagnosis,optimization,and control for complex separation systems in practice.Finally,as a bridge connecting big data intelligent technology and actual industrial processes,dynamic digital twin modeling is discussed for its potential to boost efficiency and sustainability in the chemical industry.
基金Pre-research Foundation of Jiangnan University,China(No.206000-52210761)
文摘A new algorithm of measurement slub yarn parameter was put forward to improve precision and efficient. The basic principal of measurement slub yarn by parallel-plate capacitor was introduced,and slub yarns were tested with a measurement system developed by ourselves. Time sequence for slub length and slub space can be got. And distributions of slub length,slub space and slub scaling factor can also be obtained. The agreement can be attained compared with those original settings. Some error was analyzed also. Consequently this system is effective,and can be adopted in practice.
基金supported by the Scientific Research Foundation of Third Institute of Oceanography,SOA(NO.2010018)the Public Science and Technology Research Funds Projects of Ocean(NO.201005004,NO.201305038)
文摘It is seriously interfered by ship noise when analyzing and extracting broadband spark sound source signal. In the energy concentrated domain which is below 5 kHz, the traditional scale correlation filtering algorithm, which is based on adjacent-scale correlation, has limited anti-interference ability due to the low signal-to-noise ratio （SNR） and similar Lipschitz exponent characteristic of each other. However, because different frequency bands of the broadband electric spark signal have different noise interferences, the filtering algorithm based on adjacent-scale correlation is adapted to high SNR and small-scale high-frequency wavelet coefficients filtering; the filtering algorithm based on cross-scale correlation is adapted to low SNR and large-scale low-frequency wavelet coefficients filtering, and the threshold coefficient selection method had been corrected in the algorithm. It is shown that the filtering algorithm has a good filtering effect and extracts the broadband spark sound source signal effectively; it is applicable to broadband underwater acoustic signM processing in the presence of narrow-band strong interference background noise.
文摘Based on the three-term decomposition model for turbulent flows, the fundamental equations for quasi-periodic motions are obtained, and the approximate analytical solutions of these second-order nonlinear partial differential equations are derived by using the match method. The effects on the mo- mentum, heat and mass transport processes in the wall turbulent flows can be estimated approximately.
文摘Geological Society Special Publications No.253,London,2006,456 pp.,Price List:£85.00,US$170 ISBN 1-86239-191-2 Earth science began with the observation of the Earth materials and processes,then asking specific questions,proposing and testing hypotheses,formulating general concepts and theories,and finally experimenting and modelling.On a larger scale,this has been the pattern of Earth science history;and on a smaller scale this also is how a comprehensive Earth science research project proceeds.Experimentation,modelling and simulation are relatively recent developments in Earth science,and in this regard Earth scientists have a long way to go compared with their colleagues in physics and chemistry.But serious steps have been taken in recent decades.This new book is a testimony to these developments in the field of tectonic modelling.
文摘Correction:Systems Microbiology and Biomanufacturing https://doi.org/10.1007/s43393-023-00197-w In the original article,the author name‘Emmanuel Olusola Oke’was given incorrectly as'Olushola E.Oke'.The origi-nal article has been corrected.
