检索结果-内蒙古大学图书馆

arXiv 2023年

作者： Iršič, Vid Viel, Matteo Haehnelt, Martin G. Bolton, James S. Molaro, Margherita Puchwein, Ewald Boera, Elisa Becker, George D. Gaikwad, Prakash Keating, Laura C. Kulkarni, Girish Kavli Institute for Cosmology University of Cambridge Madingley Road CambridgeCB3 0HA United Kingdom Cavendish Laboratory University of Cambridge 19 J. J. Thomson Ave. CambridgeCB3 0HE United Kingdom SISSA- International School for Advanced Studies Via Bonomea 265 Trieste34136 Italy INFN - National Institute for Nuclear Physics Via Valerio 2 TriesteI-34127 Italy IFPU Institute for Fundamental Physics of the Universe via Beirut 2 Trieste34151 Italy INAF Osservatorio Astronomico di Trieste Via G. B. Tiepolo 11 TriesteI-34131 Italy ICSC - Centro Nazionale di Ricerca in High Performance Computing Big Data e Quantum Computing Via Magnanelli 2 Bologna Italy Institute of Astronomy University of Cambridge Madingley Road CambridgeCB3 0HA United Kingdom School of Physics and Astronomy University of Nottingham University Park NottinghamNG7 2RD United Kingdom Leibniz-Institut für Astrophysik Potsdam An der Sternwarte 16 Potsdam14482 Germany Department of Physics and Astronomy University of California RiversideCA92521 United States Max-Planck-Institut für Astronomie Königstuhl 17 HeidelbergD-69117 Germany Institute for Astronomy University of Edinburgh Blackford Hill EdinburghEH9 3HJ United Kingdom Tata Institute of Fundamental Research Homi Bhabha Road Mumbai400005 India

This study introduces novel constraints on the free-streaming of thermal relic warm dark matter (WDM) from Lyman-α forest flux power spectra. Our analysis utilises a high-resolution, high-redshift sample of quasar spectra observed using the HIRES and UVES spectrographs (z = 4.2 − 5.0). We employ a Bayesian inference framework and a simulation-based likelihood that encompasses various parameters including the free-streaming of dark matter, cosmological parameters, the thermal history of the intergalactic medium, and inhomogeneous reionization, to establish lower limits on the mass of a thermal relic WDM particle of 5.7 keV (at 95% C.L.). This result surpasses previous limits from the Lyman-α forest through reduction of the measured uncertainties due to a larger statistical sample and by measuring clustering to smaller scales (kmax = 0.2 km−1 s). The approximately two-fold improvement due to the expanded statistical sample suggests that the effectiveness of Lyman-α forest constraints on WDM models at high redshifts are limited by the availability of high-quality quasar spectra. Restricting the analysis to comparable scales and thermal history priors as in prior studies (kmax −1 s) lowers the bound on the WDM mass to 4.1 keV. As the precision of the measurements increases, it becomes crucial to examine the instrumental and modelling systematics. On the modelling front, we argue that the impact of the thermal history uncertainty on the WDM particle mass constraint has diminished due to improved independent observations. At the smallest scales, the primary source of modeling systematic arises from the structure in the peculiar velocity of the intergalactic medium and inhomogeneous reionization. © 2023, CC BY.

关键词： Galaxies

来源：评论

学校读者我要写书评

暂无评论

A Holistic Stream Partitioning Algorithm for Distributed Stream Processing Systems

A Holistic Stream Partitioning Algorithm for Distributed Str...

引用

IEEE International Conference on Parallel and Distributed computing, Applications and Technologies (PDCAT)

作者： Kejian Li Gang Liu Minhua Lu Guangdong Province Key Laboratory of Popular High Performance Computers Guangdong Province Engineering Center of China-made High Performance Data Computing System College of Computer Science and Software Engineering Shenzhen University Shenzhen China School of biomedical engineering Shenzhen University Shenzhen China

ISBN: (数字)9781728126166

ISBN: (纸本)9781728126173

The performances of modern distributed stream processing systems are critically affected by the distribution of the load across workers. Skewed data streams in real world are very common and pose a great challenge to these systems, especially for stateful applications. Key splitting, which allows a single key to be routed to multiple workers, is a great idea to achieve good balance of load in the cluster. However, it comes with the cost of increased memory consumption and computation overhead as well as network communication. In this paper, we present a new definition of metric to model the cost of key splitting for intra-operator parallelism in stream processing systems and provide a novel perspective to reduce replication factor while keeping both overall load imbalance and processing latency low. Similar to previous work, our approach treats the head and the tail of the distribution differently in order to reduce memory requirements. For the head, it uses our proposed notion of regional load imbalance to decide dynamically whether to make one more worker responsible for the heavy hitter or not. For the tail, it simply uses hash partitioning to keep the size of the routing table for the head as small as possible. Extensive experimental evaluation demonstrates that our approach provides superior performance compared to the state-of-the-art partitioning algorithms in terms of load imbalance, replication factor and latency over different levels of skewed stream distributions.

关键词： Partitioning algorithms Memory management Measurement Parallel processing Microsoft Windows Load modeling Throughput

来源：评论

学校读者我要写书评

暂无评论

The Study on the Botnet and its Prevention Policies in the Internet of Things

The Study on the Botnet and its Prevention Policies in the I...

引用

International Conference on Computer Supported Cooperative Work in Design

作者： Yimu Ji Lu Yao Shangdong Liu Haichang Yao Qing Ye Ruchuan Wang Institute of High Performance Computing and Big Data Processing Nanjing University of Posts and Telecommunications

With the rapid development of Internet of Things (IOT), IOT is more and more important. Also, it faces serious security issues. This paper analyzes Mirai's architecture. The core components are C & C server and Loader server that take charge of command and control, IOT equipments are in charge of broadcast and attack. Paper analyzes Botnet propagation model, Mirais infection attack procedure, impact factor and then proposes the corresponding anti-virus strategy.

关键词： Botnet Servers Command and control systems Password Internet of Things Cameras Protocols

来源：评论

学校读者我要写书评

暂无评论

Empirical topological investigation of practical supply chains based on complex networks

引用

Chinese Physics B 2017年第11期26卷 144-150页

作者：廖好沈婧吴兴桐陈博奎周明洋 National Engineering Laboratory for Big Data Computing Systems Guangdong Province Key Laboratory of Popular High Performance ComputersCollege of Computer Science and Software Engineering Shenzhen University Department of Computer Science School of Computing National University of Singapore

The industrial supply chain networks basically capture the circulation of social resource, dominating the stability and efficiency of the industrial system. In this paper, we provide an empirical study of the topology of smartphone supply chain network. The supply chain network is constructed using open online data. Our experimental results show that the smartphone supply chain network has small-world feature with scale-free degree distribution, in which a few high degree nodes play a key role in the function and can effectively reduce the communication cost. We also detect the community structure to find the basic functional unit. It shows that information communication between nodes is crucial to improve the resource utilization. We should pay attention to the global resource configuration for such electronic production management.

关键词： China supply chain networks complex networks data science network science

来源：评论

学校读者我要写书评

暂无评论

The impact of assembly history on the X-ray detectability of halos From galaxy groups to galaxy clusters

arXiv

引用

arXiv 2025年

作者： Marini, I. Popesso, P. Dolag, K. Biffi, V. Vladutescu-Zopp, S. Castro, T. Toptun, V. de Isídio, N. Dev, A. Mazengo, D. Comparat, J. Gouin, C. Malavasi, N. Merloni, A. Mroczkowski, T. Ponti, G. Shreeram, S. Zhang, Y. European Southern Observatory Karl Schwarzschildstrasse 2 Garching bei München85748 Germany Excellence Cluster ORIGINS Boltzmannstr. 2 Garching bei MünchenD-85748 Germany Universitäts-Sternwarte Fakultät für Physik Ludwig-Maximilians-Universität München Scheinerstr.1 München81679 Germany Max-Planck-Institut für Astrophysik Karl-Schwarzschildstr. 1 Garching bei München85741 Germany INAF Osservatorio Astronomico di Trieste Via Tiepolo 11 Trieste34143 Italy IFPU Institute for Fundamental Physics of the Universe Via Beirut 2 TriesteI-34014 Italy INFN Sezione di Trieste Via Valerio 2 TS Trieste34127 Italy ICSC - Centro Nazionale di Ricerca in High Performance Computing Big Data e Quantum Computing Via Magnanelli 2 Bologna Italy Sorbonne Université UMR7095 Institut d’Astrophysique de Paris 98 bis Boulevard Arago ParisF-75014 France Université Paris-Saclay CNRS Institut d’Astrophysique Spatiale Orsay91405 France International Centre for Radio Astronomy Research University of Western Australia M468 35 Stirling Highway PerthWA6009 Australia Department of Physics College of Natural and Mathematical Sciences University of Dodoma P.O. Box 338 Dodoma Tanzania United Republic of Max Planck Institute for Extraterrestrial Physics Giessenbachstrasse 1 Garching85748 Germany INAF Osservatorio Astronomico di Brera Via E. Bianchi 46 LC Merate23807 Italy DiSAT Università degli Studi dell’Insubria via Valleggio 11 ComoI-22100 Italy

Galaxy groups represent a significant fraction of the halo population, playing a crucial role in galaxy formation and evolution. However, their detection in X-rays remains challenging, raising questions about the physical mechanisms driving their detectability in current surveys. Using the Magneticum simulations, we construct a mock X-ray lightcone of the local Universe (z 500 = 1013 M☉ can have hot gas fractions in the range fgas = 0.02 − 0.06 and a central SMBH with a median mass of MBH = 109 M☉ and a scatter of 0.5 dex) compatible with the most recent measurements of the baryonic fraction. These findings will aid the interpretation of future X-ray surveys, demonstrating the power of simulation-based inference. Copyright © 2025, The Authors. All rights reserved.

关键词： Black holes

来源：评论

学校读者我要写书评

暂无评论

Euclid's Sensitivity to Neutrino Parameters 12

Euclid's Sensitivity to Neutrino Parameters

引用

12th Neutrino Oscillation Workshop, NOW 2024

作者： Archidiacono, M. Lesgourgues, J. Casas, S. Pamuk, S. Schöneberg, N. Sakr, Z. Parimbelli, G. Schneider, A. Hervas Peters, F. Pace, F. Sabarish, V.M. Costanzi, M. Camera, S. Carbone, C. Clesse, S. Frusciante, N. Fumagalli, A. Monaco, P. Scott, D. Viel, M. Dipartimento di Fisica "Aldo Pontremoli" Università degli Studi di Milano Via Celoria 16 Milano20133 Italy INFN-Sezione di Milano Via Celoria 16 Milano20133 Italy RWTH Aachen University Aachen52056 Germany CSIC Univ. de Cantabria Avda. de los Castros s/n SantanderE-39005 Spain Martí i Franquès 1 Barcelona08028 Spain Institut für Theoretische Physik University of Heidelberg Philosophenweg 16 Heidelberg69120 Germany Université de Toulouse CNRS UPS CNES 14 Av. Edouard Belin Toulouse31400 France Université St Joseph Faculty of Sciences Beirut Lebanon Campus UAB Carrer de Can Magrans s/n Barcelona08193 Spain Dipartimento di Fisica Università degli studi di Genova INFN-Sezione di Genova via Dodecaneso 33 Genova16146 Italy SISSA International School for Advanced Studies Via Bonomea 265 TS Trieste34136 Italy Department of Astrophysics University of Zurich Winterthurerstrasse 190 Zurich8057 Switzerland Université Paris-Saclay Université Paris Cité CEA CNRS AIM Gif-sur-Yvette91191 France Dipartimento di Fisica Università degli Studi di Torino Via P. Giuria 1 Torino10125 Italy INFN-Sezione di Torino Via P. Giuria 1 Torino10125 Italy INAF-Osservatorio Astrofisico di Torino Via Osservatorio 20 TO Pino Torinese10025 Italy Hamburger Sternwarte University of Hamburg Gojenbergsweg 112 Hamburg21029 Germany Dipartimento di Fisica Sezione di Astronomia Università di Trieste Via Tiepolo 11 Trieste34131 Italy INAF-Osservatorio Astronomico di Trieste Via G. B. Tiepolo 11 Trieste34143 Italy IFPU Institute for Fundamental Physics of the Universe via Beirut 2 Trieste34151 Italy INAF-IASF Milano Via Alfonso Corti 12 Milano20133 Italy Service de Physique Théorique CP225 Boulevard du Triophe Bruxelles1050 Belgium Department of Physics "E. Pancini" University Federico II Via Cinthia 6 Napoli80126 Italy Ludwig-Maximilians-University Schellingstrasse 4 Munich80799 Germany INFN Sezione di Trieste Via Valerio 2 TS Tri

The European Space Agency launched its newest mission in July 2023: Euclid, which is designed to create the largest galaxy clustering and weak gravitational lensing survey to date. The complementarity of wide imaging and spectroscopy will provide excellent sensitivity to the history of structure formation, and hence to physics that affects that history. Here we present the latest forecasts of how Euclid's main cosmological probes will be able to constrain parameters from neutrino physics. Specifically we focus on the summed mass of neutrino species Í mv, as well as the effective number of additional relativistic species ΔNeff. We show how the forthcoming Euclid data should lead to unprecedented sensitivity for these parameters, and together with data from future cosmic microwave background experiments, could enable a detection of the neutrino mass scale. © Copyright owned by the author(s)

关键词： Cosmology

来源：评论

学校读者我要写书评

暂无评论

Blockchain and IoT data Analytics for Fine-Grained Transportation Insurance 24

Blockchain and IoT Data Analytics for Fine-Grained Transport...

引用

24th IEEE International Conference on Parallel and Distributed Systems, ICPADS 2018

作者： Li, Zengxiang Xiao, Zhe Xu, Quanqing Sotthiwat, Ekanut Mong Goh, Rick Siow Liang, Xueping Institute of High Performance Computing ASTAR Singapore Big Data Experience Center Computer Engineering Department King Mongkut's University of Technology Thonburi Thailand Old Dominion University NorfolkVA United States

ISBN: (纸本)9781538673089

Innovations such as the Cloud, Internet of Things (IoT), and data analytics have already dramatically altered the customer experience in many, if not all, industries. Blockchain, as another emerging technology, is expected to be the next generation infrastructure to established trusted multiparty collaborations. In this paper, we investigated the convergence of aforementioned technologies, by presenting a prototype of fine-grained transportation insurance. Insurance premium were assessed based on vehicle's usage and driver's behavior, which were deduced from streaming IoT data collected from mobile sensors. This incentive mechanism promotes fairness among drivers and encourages safer driving style. The prototype takes advantage of both private blockchain (e.g., high transaction rate in Hyperledger) and public blockchain (e.g., inbuilt cryptocurrency). Besides system architecture and implementation details, preliminary performance evaluations are presented and discussed. © 2018 IEEE.

关键词： Insurance

来源：评论

学校读者我要写书评

暂无评论

The Library for Hadoop Deflate Compression Based on FPGA Accelerator with Load Balance

The Library for Hadoop Deflate Compression Based on FPGA Acc...

引用

IEEE International Conference on Parallel and Distributed computing, Applications and Technologies (PDCAT)

作者： Haixin Du Jiankui Zhang Shihao Sha Cai Ye Qiuming Luo College of Computer Science and Software Engineering Shenzhen University NHPCC/Guangdong Key Laboratory of popular HPC and Guangdong Province Engineering Center of China-made High Performance Data Computing System Shenzhen China

ISBN: (数字)9781728126166

ISBN: (纸本)9781728126173

Hadoop application will produce lots of intermediate results in the map/reduce process that requires disk I/O and network transmission. By compressing the large-scale data of intermediate result, it will greatly improve disk access efficiently and reduce program run time. Hardware-accelerated solutions have become more desirable. This paper design a multi-FPGA compression accelerator on the Hadoop platform, and the system performance analysis compared with a software-only solution that mainly uses CPU to processing. The testing programs are zpipe, TestDFSIO and Terasort. In contrast with the software-only solution. The max speedup of zpipe is 6.55X (single FPGA) and 10.24X (dual FPGA), the max speedup of TestDFSIO is 6.28X (single FPGA) and 6.28X (dual FPGA), and the max speedup of Terasort application is up to 3.25X(single FPGA) and 3.35X(dual FPGA).

关键词： Handheld computers Conferences Computer science Software engineering Distributed databases Indexes

来源：评论

学校读者我要写书评

暂无评论

KiDS-1000 and DES-Y1 combined: Cosmology from peak count statistics

arXiv

引用

arXiv 2024年

作者： Harnois-Déraps, Joachim Heydenreich, Sven Giblin, Benjamin Martinet, Nicolas Tröster, Tilman Asgari, Marika Burger, Pierre Castro, Tiago Dolag, Klaus Heymans, Catherine Hildebrandt, Hendrik Joachimi, Benjamin Wright, Angus H. School of Mathematics Statistics and Physics Newcastle University Herschel Building Newcastle-upon-TyneNE1 7RU United Kingdom Department of Astronomy and Astrophysics University of California Santa Cruz 1156 High Street Santa CruzCA95064 United States Institute for Astronomy University of Edinburgh Blackford Hill EdinburghEH9 3HJ United Kingdom Université d’Aix-Marseille CNRS CNES LAM Marseille France Institute for Particle Physics and Astrophysics ETH Zürich Zürich8092 Switzerland E.A Milne Centre University of Hull Cottingham Road HullHU6 7RX United Kingdom University of Hull Cottingham Road Kingston-upon-HullHU6 7RX United Kingdom Waterloo Centre for Astrophysics University of Waterloo WaterlooONN2L 3G1 Canada Department of Physics and Astronomy University of Waterloo WaterlooONN2L 3G1 Canada Argelander-Institut für Astronomie Auf dem Hügel 71 Bonn53121 Germany INAF - Osservatorio Astronomico di Trieste via Tiepolo 11 TriesteI-34131 Italy INFN - Sezione di Trieste Via Valerio 2 TS Trieste34100 Italy IFPU - Institute for Fundamental Physics of the Universe via Beirut 2 Trieste34151 Italy ICSC - Centro Nazionale di Ricerca in High Performance Computing Big Data e Quantum Computing Via Magnanelli 2 Bologna Italy Max-Planck-Institut fur Astrophysik Karl-Schwarzschild Strasse 1 Garching85748 Germany German Centre for Cosmological Lensing Bochum44780 Germany Department of Physics and Astronomy University College London Gower Street LondonWC1E 6BT United Kingdom

We analyse the fourth data release of the Kilo Degree Survey (KiDS-1000) and extract cosmological parameter constraints based on the cosmic shear peak count statistics. Peaks are identified in aperture mass maps in which the filter is maximally sensitive to angular scales in the range 2-4 arcmin, probing deep into the non-linear regime of structure formation. We interpret our results with a simulation-based inference pipeline, sampling over a broad wCDM prior volume and marginalising over uncertainties on shape calibration, photometric redshift distribution, intrinsic alignment and baryonic feedback. Our measurements constrain the structure growth parameter and the amplitude of the non-linear intrinsic alignment model to Σ8 ≡ σ8 [Ωm/0.3]0.60 = 0.765+−00030030 and AIA = 0.71+−004242, respectively, in agreement with previous KiDS-1000 results based on two-point shear statistics. These results are robust against modelling of the non-linear physics, different scale cuts and selections of tomographic bins. The posterior is also consistent with that from the Dark Energy Survey Year-1 peak count analysis presented in Harnois-Déraps et al (2021), and hence we jointly analyse both surveys with a common pipeline. We obtain Σjoint8 ≡ σ8 [Ωm/0.3]0.57 = 0.759+−00020017, in agreement with the Planck wCDM results. The shear-CMB tension on this parameter increases to 3.1σ when forcing w = −1.0, and to 4.1σ if comparing instead with S8joint,ΛCDM = 0.736+−00016018, one of the tightest constraints to date on this quantity. Residual biases in the photometric redshifts of the DES-Y1 data and in the modelling of small scales physics could lower this tension, however it is robust against other systematics. Limits in the accuracy of our emulator prevent us from constraining Ωm © 2024, CC BY.

关键词： Dark energy

来源：评论

学校读者我要写书评

暂无评论

The chemical evolution of the solar neighbourhood for planet-hosting stars

arXiv

引用

arXiv 2023年

作者： Pignatari, Marco Trueman, Thomas C.L. Womack, Kate A. Gibson, Brad K. Côté, Benoit Turrini, Diego Sneden, Christopher Mojzsis, Stephen J. Stancliffe, Richard J. Fong, Paul Lawson, Thomas V. Keegans, James D. Pilkington, Kate Passy, Jean-Claude Beers, Timothy C. Lugaro, Maria ELKH Konkoly Thege M. út 15–17 BudapestH-1121 Hungary CSFK MTA Centre of Excellence Konkoly Thege Miklós út 15-17. BudapestH-1121 Hungary E. A. Milne Centre for Astrophysics Department of Physics and Mathematics University of Hull HU6 7RX United Kingdom INAF - Turin Astrophysical Observatory Via Osservatorio 20 Pino Torinese10025 Italy INAF - Institute of Space Astrophysics and Planetology Via Fosso del Cavaliere 100 Rome00133 Italy ICSC National Research Centre for High Performance Computing Big Data and Quantum Computing Via Magnanelli 2 Casalecchio di Reno40033 Italy Department of Astronomy and McDonald Observatory The University of Texas AustinTX78712 United States NuGrid Collaboration Joint Institute for Nuclear Astrophysics Center for the Evolution of the Elements United States Department of Physics and Astronomy University of Victoria VictoriaBCV8P 5C2 Canada Pázmány Péter sétány 1/c BudapestH-1117 Hungary H.H. Wills Physics Laboratory University of Bristol Tyndall Avenue BristolBS8 1TL United Kingdom Centre of Excellence for Data Science Artificial Intelligence and Modelling University of Hull HU6 7RX United Kingdom Astrophysics Group Lennard-Jones Laboratories Keele University KeeleST5 5BG United Kingdom School of Physical Sciences The Open University Milton KeynesMK7 6AA United Kingdom Max Planck Institute for Intelligent Systems Tübingen Germany Department of Physics and Astronomy University of Notre Dame Notre DameIN46556 United States ELTE Eötvös Loránd University Institute of Physics Pázmány Péter sétány 1/A Budapest1117 Hungary School of Physics and Astronomy Monash University VIC3800 Australia

Theoretical physical-chemical models for the formation of planetary systems depend on data quality for the Sun’s composition, that of stars in the solar neighbourhood, and of the estimated "pristine" compositions for stellar systems. The effective scatter and the observational uncertainties of elements within a few hundred parsecs from the Sun, even for the most abundant metals like carbon, oxygen and silicon, are still controversial. Here we analyse the stellar production and the chemical evolution of key elements that underpin the formation of rocky (C, O, Mg, Si) and gas/ice giant planets (C, N, O, S). We calculate 198 galactic chemical evolution (GCE) models of the solar neighbourhood to analyse the impact of different sets of stellar yields, of the upper mass limit for massive stars contributing to GCE (Mup) and of supernovae from massive-star progenitors which do not eject the bulk of the iron-peak elements (faint supernovae). Even considering the GCE variation produced via different sets of stellar yields, the observed dispersion of elements reported for stars in the Milky Way disk is not reproduced. Among others, the observed range of super-solar [Mg/Si] ratios, sub-solar [S/N], and the dispersion of up to 0.5 dex for [S/Si] challenge our models. The impact of varying Mup depends on the adopted supernova yields. Thus, observations do not provide a constraint on the Mup parametrization. When including the impact of faint supernova models in GCE calculations, elemental ratios vary by up to 0.1-0.2 dex in the Milky Way disk;this modification better reproduces observations. Copyright © 2023, The Authors. All rights reserved.

关键词： Dispersions

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：