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Probing the Bardeen-Kiselev black hole with the cosmological constant caused by Einstein equations coupled with nonlinear electrodynamics using quasinormal modes and greybody bounds

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Communications in Theoretical Physics 2024年第6期76卷 102-119页

作者： s R Wu B Q Wang Z W Long College of Physics Guizhou UniversityGuiyang 550025China College Pharmacy Guizhou University of Traditional Chinese MedicineGuiyang 550025China

In this work,we investigate a static and spherically symmetric Bardeen-Kiselev black hole(BH)with the cosmological constant,which is a solution of the Einstein-non-linear Maxwell field *** compute the quasinormal frequencies for the Bardeen-Kiselev BH with the cosmological constant due to electromagnetic and gravitational *** varying the BH parameters,we discuss the behavior of both real and imaginary parts of the BH quasinormal frequencies and compare these frequencies with the Reissner-Nordström-de sitter BH surrounded by quintessence(RN-dsQ).Interestingly,it is shown that the responses of the Bardeen-Kiselev BH with the cosmological constant and the RN-dsQ under electromagnetic perturbations are different when the charge parameter q,the state parameter w and the normalization factor c are varied;however,for the gravitational perturbations,the responses of the Bardeen-Kiselev BH with the cosmological constant and the RN-dsQ are different only when the charge parameter q is ***,compared with the gravitational perturbations,the electromagnetic perturbations can be used to understand nonlinear and linear electromagnetic fields in curved spacetime *** interesting observation is that,due to the presence of Kiselev quintessence,the electromagnetic perturbations around the Bardeen-Kiselev BH with the cosmological constant damps faster and oscillates slowly;for the gravitational perturbations,the quasinormal mode decays slowly and oscillates *** also study the reflection and transmission coefficients along with the absorption cross section in the Bardeen-Kiselev BH with the cosmological constant;it is shown that the transmission coefficients will increase due to the presence of Kiselev quintessence.

关键词： quasinormal modes greybody factors Bardeen-Kiselev black hole with cosmological constant

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Transport institutions and organisations in the formulation of policies for Australian local area traffic management:A 50-year retrospective

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Journal of Traffic and Transportation Engineering(English Edition) 2023年第5期10卷 866-877页

作者： John black school of Civil and Environmental Engineering University of New South WalesSydneyNSW 2052Australia

A review of 115 studies on Australian local area traffic management(LATM)schemes covers network planning,computer modelling,overall design considerations,the deployment of various traffic control devices,project evaluation and numerous before and after case ***,no research has been published about the formulation of LATM policies and the processes involved that were formulated during the 1970s and 1980s and aimed at discouraging non-local through traffic in residential areas,improving road safety,and improving environmental amenity through physical *** paper develops a conceptual model of the interactions amongst institutions of government(state and local),organisations(national research institutes and universities),and civil society(the consulting industry,lobby groups and community action groups).The model is implemented through a series of unstructured interviews with key players involved with research and advocacy,capacity building,and state government policy makers that determined:who was responsible for the governance of LATM schemes?What were the respective roles of institutions and organisations in relation to the early formulation of policies and plans,especially issues of authority?Who were the key players in these institutions and organisations?To what extent did external influences of ideas by overseas agents(policy transfer)occur in decision making?A recently implemented LATM scheme(seven Ways)by Waverley Council describes the latest approaches,including community *** conclusions note the importance of a society investing in road research,having universities capable of delivering high-quality professional development programs,and having a consulting industry that is willing to deliver innovative,practical advice to local *** are made about areas for further research.

关键词： Transport policy Policy formulation Conceptual model LATM Transport institutions and organisations

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Acoustical properties of a 3D printed honeycomb structure filled with nanofillers:Experimental analysis and optimization for emerging applications

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Defence Technology（防务技术） 2024年第5期35卷 248-258页

作者： Jeyanthi subramanian Vinoth kumar selvaraj Rohan singh Ilangovan s Naresh Kakur Ruban Whenish school of Mechanical Engineering Vellore Institute of TechnologyChennai600127Tamil NaduIndia Department of Mechanical Engineering SRM Institute of Science and TechnologyRamapuramChennai600089India Department of Chemical Engineering and Materials science University of Southern CaliforniaLos Angeles90089USA Advanced Materials Research Centre Technology Innovation InstituteAbu Dhabi9639UAE Center for Biomaterials Cellular and Molecular TheranosticsVellore Institute of TechnologyVellore632014Tamil NaduIndia

The novelty of this research lies in the successful fabrication of a 3D-printed honeycomb structure filled with nanofillers for acoustic properties,utilizing an impedance tube setup in accordance with AsTM standard E *** Creality Ender-3,a 3D printer,was used for printing the honeycomb structures,and polylactic acid(PLA)material was employed for their *** organic,inorganic,and polymeric compounds within the composites were identified using fourier transformation infrared(FTIR)*** structure and homogeneity of the samples were examined using a field emission scanning electron microscope(FEsEM).To determine the sound absorption coefficient of the 3D printed honeycomb structure,numerous samples were systematically developed using central composite design(CCD)and analysed using response surface methodology(RsM).The RsM mathematical model was established to predict the optimum values of each factor and noise reduction coefficient(NRC).The optimum values for an NRC of 0.377 were found to be 1.116 wt% carbon black,1.025 wt% aluminium powder,and 3.151 mm distance between parallel ***,the results demonstrate that a 3Dprinted honeycomb structure filled with nanofillers is an excellent material that can be utilized in various fields,including defence and aviation,where lightweight and acoustic properties are of great importance.

关键词： 3D printing Honeycomb structure Acoustics Field emission scanning electron microscope Response surface methodology

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Review of current method to determine outburst threshold limits in Australian underground coal mines

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International Journal of Mining science and Technology 2019年第6期29卷 859-865页

作者： Dennis J.black CoalGAs Department of Civil Mining and Environmental Engineering University of Wollongong

Desorption rate index(DRI)was presented to the Australian underground coal industry in 1995 as a means for determining outburst threshold limits for Australian coal *** is a measure of the gas volume released from a coal sample in the first 30 s of crushing during the Q3 stage of gas content testing,multiplied by the ratio between measured Q3 and *** were identified between QM and DRI for both CO2 and CH4 rich coal samples collected from the Bulli seam at West Cliff Colliery and that identified relationship was referred to as the Bulli seam *** outburst mining gas content threshold limit values specified for the Bulli seam at that time,when applied to the QM-DRI Bulli seam benchmark,was shown to closely align with a DRI value of 900(DRI900),for both CO2 and CH4 rich seam gas *** Australian coal industry adopted the DRI900 as the basis for determining outburst gas content TLV for Australian coal *** mining experience in Australia has shown that gas content is not the only significant factor that impacts outburst risk,as all significant outburst events have been associated with abnormal geological conditions,such as faults and ***,assessing the potential application of additional outburst risk factors,to accurately define outburst risk zones,set safe mining threshold levels,and determine appropriate mining controls,warrants further *** Australian coal mines have implemented mining procedures enabling mining to continue in areas with gas content greater than the TLV determined using the DRI900 approach,without inducing an *** is a broad lack of understanding among Australian coal mine operators as to the procedure and calculations used to determine ***,there has been growing concern regarding the accuracy and validity of the DRI900 method for determining outburst TLV.A comprehensive set of gas data has been collected from Australian coal seams,including the Bulli seam,and t

关键词： Outburst Desorption rate DRI Threshold limit

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Transparent and Accurate COVID-19 Diagnosis:Integrating Explainable AI with Advanced Deep Learning in CT Imaging

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Computer Modeling in Engineering & sciences 2024年第6期139卷 3101-3123页

作者： Mohammad Mehedi Hassan salman A.AlQahtani Mabrook s.AlRakhami Ahmed Zohier Elhendi Department of Information systems College of Computer and Information SciencesKing Saud UniversityRiyadh11543Saudi Arabia Department of Computer Engineering College of Computer and Information SciencesKing Saud UniversityRiyadh11543Saudi Arabia science Technology and Innovation Department King Saud UniversityRiyadh11543Saudi Arabia

In the current landscape of the COVID-19 pandemic,the utilization of deep learning in medical imaging,especially in chest computed tomography(CT)scan analysis for virus detection,has become increasingly *** its potential,deep learning’s“black box”nature has been a major impediment to its broader acceptance in clinical environments,where transparency in decision-making is *** bridge this gap,our research integrates Explainable AI(XAI)techniques,specifically the Local Interpretable Model-Agnostic Explanations(LIME)method,with advanced deep learning *** integration forms a sophisticated and transparent framework for COVID-19 identification,enhancing the capability of standard Convolutional Neural Network(CNN)models through transfer learning and data *** approach leverages the refined DenseNet201 architecture for superior feature extraction and employs data augmentation strategies to foster robust model *** pivotal element of our methodology is the use of LIME,which demystifies the AI decision-making process,providing clinicians with clear,interpretable insights into the AI’s *** unique combination of an optimized Deep Neural Network(DNN)with LIME not only elevates the precision in detecting COVID-19 cases but also equips healthcare professionals with a deeper understanding of the diagnostic *** method,validated on the sARs-COV-2 CT-scan dataset,demonstrates exceptional diagnostic accuracy,with performance metrics that reinforce its potential for seamless integration into modern healthcare *** innovative approach marks a significant advancement in creating explainable and trustworthy AI tools for medical decisionmaking in the ongoing battle against COVID-19.

关键词： Explainable AI COVID-19 CT images deep learning

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Bulk-boundary and RPs thermodynamics from topology perspective

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Chinese Physics C 2024年第9期48卷 244-253页

作者： Jafar sadeghi Mohammad Reza Alipour saeed Noori Gashti Mohammad Ali s.Afshar Department of Physics Faculty of Basic SciencesUniversity of Mazandaran P.O.Box 47416-95447BabolsarIran school of Physics Damghan UniversityP.O.Box ***DamghanIran

In this study,we investigate the bulk-boundary and restricted phase space(RPs)thermodynamics of Rissner-Nordstrom(R-N)Ads and 6-dimensional charged Gauss-Bonnet Ads black ***,we examine the topological characteristics of the considered black holes and compare them with the results of extended *** determine that the topological behavior of the bulk-boundary thermodynamics is the same as that of the extended thermodynamics,whereas the RPs thermodynamics exhibits a distinct ***,we demonstrate that within the RPs formalism,there is only one critical point with a topological charge of+1(Q_(t)=+1).Moreover,in the RPs formalism,the inclusion of higher-derivative curvature terms in the form of GaussBonnet gravity does not alter the topological classification of critical points in charged Ads black holes.

关键词： bulk-boundary restricted phase space topological charge thermodynamics

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Electrically-driven ultrafast out-of-equilibrium light emission from hot electrons in suspended graphene/hBN heterostructures

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International Journal of Extreme Manufacturing 2024年第1期6卷 328-338页

作者： Qiang Liu Wei Xu Xiaoxi Li Tongyao Zhang Chengbing Qin Fang Luo Zhihong Zhu shiqiao Qin Mengjian Zhu Kostya s Novoselov College of Advanced Interdisciplinary studies&Hunan Provincial Key Laboratory of Novel Nano-optoelectronic Information Materials and Devices National University of Defense TechnologyChangshaHunan 410073People’s Republic of China Nanhu Laser Laboratory National University of Defense TechnologyChangshaHunan 410073People’s Republic of China state Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Opto-ElectronicsShanxi UniversityTaiyuan 030006People’s Republic of China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuan 030006People’s Republic of China state Key Laboratory of Quantum Optics and Quantum Optics Devices Institute of Laser SpectroscopyShanxi UniversityTaiyuan 030006People’s Republic of China Institute for Functional Intelligent Materials National University of SingaporeSingapore 117544Singapore Department of Materials science and Engineering National University of SingaporeSingapore 117575Singapore

Nanoscale light sources with high speed of electrical modulation and low energy consumption are key components for nanophotonics and *** record-high carrier mobility and ultrafast carrier dynamics of graphene make it promising as an atomically thin light emitter which can be further integrated into arbitrary platforms by van der Waals ***,due to the zero bandgap,graphene is difficult to emit light through the interband recombination of carriers like conventional ***,we demonstrate ultrafast thermal light emitters based on suspended graphene/hexagonal boron nitride(Gr/hBN)*** in biased graphene are significantly heated up to 2800 K at modest electric fields,emitting bright photons from the near-infrared to the visible spectral *** eliminating the heat dissipation channel of the substrate,the radiation efficiency of the suspended Gr/hBN device is about two orders of magnitude greater than that of graphene devices supported on siO2or *** demonstrate that hot electrons and low-energy acoustic phonons in graphene are weakly coupled to each other and are not in full thermal *** cooling ofhigh-temperature hot electrons to low-temperature acoustic phonons is enabled by the significant near-field heat transfer at the highly localized Gr/hBN interface,resulting in ultrafast thermal emission with up to 1 GHz bandwidth under electrical *** is found thatsuspending the Gr/hBN heterostructures on the siO2trenches significantly modifies the light emission due to the formation of the optical cavity and showed a~440%enhancement inintensity at the peak wavelength of 940 nm compared to the black-body thermal *** demonstration of electrically driven ultrafast light emission from suspended Gr/hBNheterostructures sheds the light on applications of graphene heterostructures in photonicintegrated circuits,such as broadband light sources and ultrafast thermo-optic phase modulat

关键词： suspended graphene ultrafast light emitter van der Waals heterostructures thermal radiation electron–phonon interaction

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The Importance of Active surveillance in the Assessment of Vaccine safety

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China CDC weekly 2019年第2期1卷 26-27页

作者： steven black Global Vaccine Data Network USA Cincinnati Children’s Hospital USA

Vaccines are among the most effective public health interventions(1).However,vaccines can potentially cause *** minimize risk,proactive regulation of drugs and vaccines was implemented globally beginning in the *** ne... 详细信息

关键词： routine globally drugs

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Calcium pyrophosphate dihydrate crystals in a 9-year-old with osteomyelitis of the knee:A case report

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World Journal of Orthopedics 2022年第9期13卷 870-875页

作者： William Pavlis David s Constantinescu Rajan Murgai spencer Barnhill Brian black Department of Orthopaedics University of MiamiMiami33136United States

BACKGROUND Calcium pyrophosphate dihydrate deposition disease(CPPD),or pseudogout,is an inflammatory arthritis common among elderly patients,but rarely seen in patients under the age of *** the rare cases presented of young patients with CPPD,genetic predisposition or related metabolic conditions were almost always *** sUMMARY The authors report the case of a 9-year-old boy with no past medical history who presented with acute knee pain and swelling after a cat scratch injury 5 d *** fluid analysis identified calcium pyrophosphate dihydrate *** MRI analysis identified osteomyelitis and a small soft tissue *** This case presents the extremely rare diagnostic finding of calcium pyrophosphate dihydrate crystals in a previously healthy pediatric *** presence of osteomyelitis presents a unique insight into the pathogenesis of these crystals in pediatric *** research needs to be done on the role of CPPD in pediatric arthritis and joint infection.

关键词： Calcium pyrophosphate Pseudogout Pediatrics Crystals Osteomyelitis Case report

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Gene expression profiling as a prognostic tool in multiple myeloma

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Cancer Drug Resistance 2021年第4期4卷 1008-1018页

作者： Harmony black siobhan Glavey Department of Haematology Beaumont HospitalDublin D09 V2N0Ireland Department of Pathology Royal College of Surgeons in IrelandDublin D02 YN77Ireland

Multiple myeloma(MM)is an aggressive plasma cell malignancy with high degrees of variability in outcome,some patients experience long remissions,whilst others survive less than two years from *** refractoriness and relapse remain challenges in MM management,and there is a need for improved prognostication and targeted therapies to improve overall survival(Os).The past decade has seen a surge in gene expression profiling(GEP)studies which have elucidated the molecular landscape of MM and led to the identification of novel gene signatures that predict Os and outperform current clinical *** this review,we discuss the limitations of current prognostic tools and the emerging role of GEP in diagnostics and in the development of personalised medicine approaches to combat drug resistance.

关键词： Multiple myeloma gene expression profiling prognostication risk stratification risk-adapted therapies sKY92 drug resistance

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