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Reconfigurable Logic Design of cORDIc Based FFT Architecture for 5G communications

Intelligent Automation & Soft computing 2023年第6期36卷 2803-2818页

作者： c.thiruvengadam M.Palanivelan Department of Electronics and communication Engineering Anjalai Ammal Mahalingam Engineering CollegeThiruvarur614403TamilnaduIndia Department of Electronics and communication Engineering Rajalakshmi Engineering CollegeChennai602105TamilnaduIndia

There are numerous goals in next-generation cellular networks(5G),which is expected to be available *** want to increase data rates,reduce end-to-end latencies,and improve end-user service *** networks need to change because there has been a significant rise in the number of base stations required to meet these needs and put the operators’low-cost constraints to the *** it can withstand interference from other wireless networks,and Adaptive complex Multicarrier Modulation(AcMM)system is being looked at as a possible choice for the 5th Generation(5G)of wireless *** arithmetic units need to be used on the hardware side of multicarrier systems to do the pulse-shaping filters and inverse *** main goal of this study is to adapt complex multicarrier modulation(AcMM)for baseband transmission with low complexity and the ability to change *** found that this is the first recon-figurable architecture that lets you choose how many subcarriers a subband has while still having the same amount of hardware resources as ***,under the new design with a single selection line,it selects from a set of *** baseband modulating signal is evaluated and tested using a Field-Programmable Gate Array(FPGA)*** device is available from a commercial *** technology outperforms current technology in terms of computational com-plexity,simple design,and ease of ***,it has a higher power spectrum density,spectral efficiency,a lower bit error rate,and a higher peak to average power ratio than existing technology.

关键词： Error analysis pulse-shaping filters reconfigurable architectures FBMc OFDM UFMc

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Light sheet microscope scanning of biointegrated microlasers for localized refractive index sensing

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Photonics Research 2024年第8期12卷 1673-1680页

作者： ROSS c.cOWIE MARcEL ScHUBERT SUPA School of Physics and AstronomyUniversity of St Andrews Humboldt centre for Nano and Biophotonics Department of ChemistryUniversity of Cologne

Whispering gallery mode (WGM) microlasers are highly sensitive to localized refractive index changes allowing to link their emission spectrum to various chemical, mechanical, or physical stimuli. Microlasers recently found applications in biological studies within single cells, in three-dimensional samples such as multicellular spheroids,or in vivo. However, detailed studies of biological samples also need to account for the structural heterogeneity of tissues and live animals, therefore requiring a combination of high-resolution microscopy and laser ***,we design and construct a light sheet fluorescence microscope with a coupled spectrometer for use in microlaser studies for combined high-resolution, high-speed imaging and WGM spectral analysis. The light sheet illumination profile and the decoupled geometry of excitation and emission hereby directly affect the lasing and sensing properties, mainly through geometric constraints and by light coupling effects. We demonstrate the basic working principle of microlaser spectroscopy under light sheet excitation and measure the absolute refractive index within agarose and in zebrafish tail muscle tissue. We further analyze the light coupling conditions that lead to the occurrence of two separate oscillation planes. These so-called cross modes can be scanned around the entire microlaser surface, which allows to estimate a surface-averaged refractive index profile of the microlaser environment.

关键词： High speed imaging Light sheet fluorescence microscopy Refractive index Scanning microscopy Second harmonic generation Solid state lasers

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Important step towards an understanding of the exotic Z_(c)(3900)

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Science china(Physics,Mechanics & Astronomy) 2024年第9期67卷 199-200页

作者： c.Hanhart Institute for Advanced Simulation Forschungszentrum JulichJilich D-52425Germany

The Standard Model of particle physics,which contains the field theories for the electro-weak interaction(QED)and the strong interaction(QcD),is an extremely successful theory describing a huge variety of phenomena at... 详细信息

关键词： interaction atomic describing

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A toast to a zebrafish germ cell induction cocktail

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Science china(Life Sciences) 2024年第6期67卷 1314-1315页

作者： Mary c.Mullins Department of cell and Developmental Biology University of Pennsylvania Perelman School of MedicinePhiladelphia 19104USA

The zebrafish field is ringing in the new year with a publication from Yonghua Sun's laboratory(Wang et al.,2023)of a cocktail of germline factors that can induce all cells of the zebrafish embryo into primordial germ cells(PGcs)at phenomenal *** major advance is not only of great interest to germ cell biologists,but it has important applications to the entire zebrafish field,as shown in Wang et al.(2023).

关键词： fish zebra field

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DPM simulation in an underground entry: comparison between particle and species models

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International Journal of Mining Science and Technology 2016年第3期26卷 487-494页

作者： thiruvengadam Magesh Zheng Yi Tien Jerry c. Department of Mining & Nuclear Engineering Missouri University of Science & Technology Division of Mining and Resources Engineering Department of Civil Engineering Monash University

The diesel particulate matter(DPM) emission from diesel powered equipment in underground mines can cause health hazards including cancer to the miners. The understanding of the DPM propagation pattern under realistic mining condition is required for selecting proper DPM control strategies and to improve working practices in underground mines. In this paper, three dimensional simulations of DPM emission from the exhaust tail pipe of a load-haul-dump(LHD) vehicle and its subsequent distribution inside an isolated zone in the typical underground mine are carried out using two different solution models available in Ansys Fluent. The incoming fresh air into the isolated zone is treated as a continuous phase and DPM is treated either as a continuous phase(gas) or as a secondary discrete phase(particle). Species transport model is used when DPM is treated as gas and discrete phase model is used when DPM is assumed to behave like a particle. The distributions of DPM concentration inside the isolated zone obtained from each method are presented and compared. From the comparison results, an accurate and economical solution technique for DPM evaluation can be selected.

关键词： cFD Dead-end DPM Discrete phase model Species transport model

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Effect of single dead end entry inclination on DPM plume dispersion

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International Journal of Mining Science and Technology 2017年第3期27卷 401-406页

作者： Zheng Yi Lan Hai thiruvengadam Magesh Tien Jerry c. Li Ying Department of Mining & Nuclear Engineering Missouri University of Science and Technology (MST) Rolla MO 65401 USA clean Air Power Inc. Poway CA 92064 USA Division of Mining and Resources Engineering Department of Civil Engineering Monash University Clayton Campus Wellington Road Clayton VIC 3800 Australia

Diesel particulate matter(DPM) is a by-product from operating diesel engines. Since diesel powers are one of the major sources of energy for mobile underground mining equipment, the adverse health effects of DPM are of a great concern. This paper used computational fluid dynamics(cFD) method to study the effect of entry inclination on DPM plume distribution in a dead end entry. An upward mining face and a downward mining face were built with a truck and a loader in loading operation close to the face area. A species transport model with incorporated buoyancy effect was used to examine the DPM dispersion pattern for the above steady-state scenarios. High DPM and temperature regions were identified for the two different faces. The model was used to assess the role of auxiliary ventilation in reducing DPM exposures of underground miners working in those entries. In this study, it is suggested to provide local ventilation at least three times of the diesel exhaust rate to be able to lower the average DPM level for the mining upward face. The requirement for local ventilation is much less for the mining downward face. This can provide guidelines for good working practices and selection of diesel emission reduction technologies underground.

关键词： Entry inclination Diesel particulate matter computational fluid dynamics Ventilation

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Effect of auxiliary ventilations on diesel particulate matter dispersion inside a dead-end entry

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International Journal of Mining Science and Technology 2015年第6期25卷 927-932页

作者： Zheng Yi thiruvengadam Magesh Lan Hai Tien c.Jerry Department of Mining & Nuclear Engineering Missouri University of Science and Technology clean Air Power Inc. Division of Mining and Resources Engineering Department of Civil Engineering Monash University

Diesel particulate matter(DPM) is considered carcinogenic after prolonged exposure. This paper used computational fluid dynamics(cFD) method to study the effect of four auxiliary ventilation systems on DPM distribution in a dead-end entry with loading operation. The auxiliary ventilation systems considered include: blower fan and tubing; exhaust fan and tubing, jet fan, and push–pull system. A species transport model with buoyancy effect was used to examine the DPM dispersion pattern with unsteady state analysis. During the 200 s of the loading operation, high DPM levels were identified in the face and dead-end entry regions. This study can be used for mining engineer as guidance to design and setup of local ventilation. It can also be used for selection of DPM control strategies and DPM annual training for underground miners.

关键词： Diesel particulate mattercomputational fluid dynamicsAuxiliary ventilationDead-end entry

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Performance of evolutionary optimized machine learning for modeling total organic carbon in core samples of shale gas fields

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Petroleum 2024年第1期10卷 150-164页

作者： Leonardo Goliatt c.M.Saporetti L.c.Oliveira E.Pereira Department of computational and Applied Mechanics Federal University of Juiz de Fora Department of computational Modeling Polytechnic Institute Rio de Janeiro State University Petrobras Department of Stratigraphy and Paleontology Rio de Janeiro State University

Rock samples' TOc content is the best indicator of the organic matter in source rocks. The origin rock samples' analysis is used to calculate it manually by specialists. This method requires time and resources because it relies on samples from many well intervals in source rocks. Therefore, research has been done to aid this effort. Machine learning algorithms can estimate total organic carbon instead of well logs and stratigraphic studies. In light of these efforts, the current work present a study on automating the total organic carbon estimation using machine learning approaches improved by an evolutionary methodology to give the model flexibility and precision. Genetic algorithms, differential evolution, particle swarm optimization, grey wolf optimization, artificial bee colony, and evolution strategies were used to improve machine learning models to predict TOc. The six metaheuristics were integrated into four machine learning methods: extreme learning machine, elastic net linear model, linear support vector regression, and multivariate adaptive regression splines. core samples from the YuDong-Nan shale gas field, located in the Sichuan basin, were used to evaluate the hybrid strategy. The findings show that combining machine learning models with an evolutionary algorithms in a hybrid fashion produce flexible models that accurately predict TOc. The results show that, independent of the metaheuristic used to guide the model selection, optimized extreme learning machines attained the best performance scores according to six metrics. Such hybrid models can be used in exploratory geological research,particularly for unconventional oil and gas resources.

关键词： Total organic carbon Hybrid models Automated machine learning Evolutionary algorithms Geology

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Simulation of DPM distribution in a long single entry with buoyancy effect

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International Journal of Mining Science and Technology 2015年第1期25卷 47-52页

作者： Zheng Yi thiruvengadam Magesh Lan Hai Tien c.Jerry Department of Mining & Nuclear Engineering Missouri University of Science and Technology (MST) MO 65401 USA clean Air Power Inc. Poway CA 92064 USA Department of civil Engineering Monash University Clayton Campus Clayton VIC 3800 Australia

Diesel particulate matter(DPM) is considered carcinogenic after prolonged exposure. With more dieselpowered equipment used in underground mines, miners' exposure to DPM has become an increasing concern. This paper used computational fluid dynamics(cFD) method to study DPM distribution based on an experiment conducted by the Diesel Emissions Evaluation Program(DEEP) in canada. Twenty-four cases were simulated where the emissions from both truck and load-haul-dumps(LHDs) were *** vehicle was placed in two stream wise locations, and the vehicles were oriented either facing or with the rear end toward the main fresh airflow. A species transport model with buoyancy effect was then used to examine the DPM dispersion pattern. High DPM regions were identified downstream,around, and even upstream of diesel engines. This can provide guidelines for good working practices and selection of diesel emission reduction technologies underground.

关键词： computational fluid dynamicsDiesel particulate matterDiesel exhaustField studyBuoyancy effect

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Recent advances on bismuth oxyhalides for photocatalytic cO_(2)reduction

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Journal of Environmental Sciences 2024年第6期140卷 183-203页

作者： Liangpang Xu Jimmy c.Yu Ying Wang Department of chemistry The Chinese University of Hong KongShatinNew TerritoriesHong Kong 999077China

Photocatalytic conversion of cO_(2)into fuels such as cO,cH_(4),and cH_(3)OH,is a promising approach for achieving carbon *** oxyhalides(BiOX,where X=cl,Br,and I)are appropriate photocatalysts for this purpose due to the merits of visible-light-active,efficient charge separation,and easy-to-modify crystal structure and surface *** practical applications,multiple strategies have been proposed to develop high-efficiency BiOX-based *** review summarizes the development of different approaches to prepare BiOX-based photocatalysts for efficient cO_(2)*** the review,the fundamentals of photocatalytic cO_(2)reduction are ***,several widely used modification methods for BiOX photocatalysts are systematacially discussed,including heterojunction construction,introducing oxygen vacancies(OVs),Bi-enrichment,heteroatom-doping,and morphology ***,the challenges and prospects in the design of future BiOX-based photocatalysis for efficient cO_(2)reduction are examined.

关键词： Bismuth oxyhalides Photocatalysis cO_(2)reduction Modification methods

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