检索结果-南通市图书馆

Tetrahedron constellation of gravitational wave observatory

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2025年第2期68卷 86-93页

作者： Hong-Bo Jin Cong-feng qiao National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China International Centre for Theoretical Physics Asia-Pacific University of Chinese Academy of SciencesBeijing 100190China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China

For the first time,we have introduced the tetrahedron constellation of gravitational wave observatory(TEGO)composed of four identical spacecrafts(S/Cs).The laser telescopes and their pointing structures are mounted on the S/C platform and are evenly distributed at three locations 120 degrees *** structures form automatically a stable mass center for the *** time delay interferometry(TDI)is used to suppress the frequency noise of gravitational wave(GW)*** unequal-arm Michelson TDI configuration and the Sagnac TDI configuration are equally effective at eliminating the laser frequency noise based on the TEGO ***,compared with the configurations of LISA,Taiji,and Tian Qin,the TEGO has more combinations of optical paths in its TDI system sensitive to GW *** six arms of TEGO are simultaneously sensitive to the six polarization modes of *** sensitivity implies that GW modes beyond the predictions of general relativity(GR)can be detected *** instance,a scalar longitudinal mode of GWs,which is not predicted by GR,has been identified as a dominant polarization *** mode is found to be evident in the response amplitudes of the TEGO arms,such as between S/C1 and S/C4,and S/C3 and S/C4,at certain orbital positions.

关键词： gravitational wave detectors and experiments gravitational waves experimental tests of gravitational theories experimental studies of gravity

同方期刊数据库

Sky location of massive black hole binaries in the foreground of Galactic white dwarf binaries

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2025年第1期68卷 93-104页

作者： Pan Guo Hong-Bo Jin Cong-feng qiao Yue-Liang Wu The International Centre for Theoretical Physics Asia-Pacific University of Chinese Academy of SciencesBeijing 100190China Institute for Frontiers in Astronomy and Astrophysics Beijing Normal UniversityBeijing 102206China National Astronomical Observatories Chinese Academy of SciencesBeijing 100101China The School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Institute of Theoretical Physics Chinese Academy of SciencesBeijing 100190China

For space-based gravitational wave(GW)detection,the main noise source for massive black hole binaries(MBHBs)is attributed to approximately 107 double white dwarf binaries in the *** a GW source,the amplitude of the detector response,recorded by a space-based gravitational wave detector,exhibits a modulation effect with a year period when observing the source from various orbital *** the adverse conditions mentioned above,where there is a strong foreground noise and annual modulation in the signals,we employed the wavelet transform and the strong-amplitude relevant orbital position search methods,which allows the weak MBHB sources to achieve higher locating *** detail,for two MBHB sources of lower intensity,the precision of luminosity distance,represented by the ratioΔD_(L)/D_(L) at the 95%confidence level,is enhanced by factors of∼*** angular resolutions,denoted byΔΩs,are enhanced by a factor of∼*** improvements increase the number of detectable GW sources,facilitate multi-messenger follow-up observations and provide constraints on the cosmological constant.

关键词： space-based gravitational wave detection gravitational waves massive black hole binaries

Effect of graphene addition on activation and kinetic properties of La-Mg-Ni-based hydrogen storage alloys

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2025年第1期32卷 227-238页

作者： dian-chen feng Chun-ling Zheng Zhi-yuan Zhao Dong-sheng Zhou Hui-ping Ren Yang-huan Zhang School of Materials and Metallurgy Inner Mongolia University of Science and TechnologyBaotou014010Inner MongoliaChina Collaborative Innovation Center of Integrated Exploitation of Bayan Obo Multi-Metal Resources Inner Mongolia University of Science and TechnologyBaotou014010Inner MongoliaChina Department of Functional Material Research China Iron and Steel Research Institute GroupBeijing100081China

The La_(1.7)Pr_(0.3)Mg_(16)Ni hydrogen storage alloy was prepared by medium-frequency induction melting,and then the composite hydrogen storage alloy powder of La_(1.7)Pr_(0.3)Mg_(16)Ni+x wt.%(x=0,2,4,and 6)graphene was prepared by ball milling for 10 *** effect of the addition of graphene on the activation and hydrogen de/absorption properties of La_(1.7)Pr_(0.3)Mg_(16)Ni alloy was *** result demonstrated that these composite alloys were composed of La_(2)Mg_(17),La_(2)Ni_(3),and Mg_(2)Ni *** saturated hydrogen absorption,it was composed of LaH_(3),Mg_(2)NiH_(4),and MgH_(2)phases,while during the dehydrogenation process,it was composed of LaH_(3),Mg,and Mg_(2)Ni *** addition of graphene can help get a more homogeneous granule after ball milling and accelerate the first activation of dehydrogenation/hydrogen *** hydrogen release activation energy of the alloys first decreases and then increases as the graphene content increases from x=0 wt.%to x=6 wt.%.The minimum activation energy of the composite hydrogen storage alloy is 51.22 kJ mol^(-1) when x=4 wt.%.

关键词： La-Mg-Ni alloy Graphene Mechanical ball milling Activation property Dynamic performance

Effect of order–disorder transition on thermodynamic and electronic properties of σ and χ phases in W–Re alloy: the first-principles calculation

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Tungsten 2025年第1期7卷 195-213页

作者： Zhi-Peng Zhu dian Jia William Yi Wang Jun-Lei Yin Xing-Yu Gao Shu-feng Yang Hai-feng Song Jin-Shan Li State Key Laboratory of Solidification Processing Northwestern Polytechnical University Laboratory of Computational Physics Institute of Applied Physics and Computational Mathematics School of Metallurgical and Ecological Engineering University of Science and Technology Beijing

The Tungsten-Rhenium(W-Re) alloys,celebrated for their high melting point,strength at elevated temperatures,electrical resistivity,and radiation resistance,have been widely utilized in high-temperature components,aerospace,electronics,and nuclear *** constituents of the topologically close-packed(TCP) phases,the sigma phase(σ) and chi phase(χ) formed within W-Re alloys wield considerable influence on the mechanical properties and the stability of the *** calculations were utilized in the present work to explore the structural,thermodynamic,and electronic properties of both ordered and disordered configurations within the σ and χ phases,culminating in a systematic elucidation of the higher phase stability exhibited by the ordered *** is found that the bulk modulus of these two phases is directly proportional to the concentration of Re in the alloy,while the equilibrium volume is inversely *** thermodynamic parameters of the σ and χ phases are calculated via the mean-field potential *** similar trends observed in the isobaric heat capacity,enthalpy increment,and entropy change curves for these two phases suggest they possess comparable thermodynamic *** is noteworthy that the contribution of ionic vibrations predominantly affects the isobaric heat capacity,while the contribution of thermal electronic excitations increases linearly with *** the structure and thermodynamic properties of TCP phases in W-Re alloys at low temperatures has profound significance for optimizing material performance,microstructures features,establishing theoretical foundations,and predicting material behavior.

关键词： First-principles calculations Phase stability TCP phases Thermodynamic properties W–Re alloy

Spatial Patterns and Controlling Factors of Soil Organic Carbon and Total Nitrogen in the Three River Headwaters Region,China

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Chinese Geographical Science 2025年第1期35卷 131-148页

作者： CUI qiao LI Zongxing feng Qi ZHANG Baijuan ZHAO Yue Observation and Research Station of Eco-Hydrology and National Park by Stable Isotope Tracing in Qilian Mountains/Key Laboratory of Ecological Safety and Sustainable Development in Arid Lands Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhou 730000China University of Chinese Academy of Sciences Beijing 100049China College of Geography and Environmental Science Northwest Normal UniversityLanzhou 730070China

The alpine ecosystem has great potential for carbon *** organic carbon(SOC)and total nitrogen(TN)are highly sensitive to climate change,and their dynamics are crucial to revealing the effect of climate change on the structure,function,and services of the ***,the spatial distribution and controlling factors of SOC and TN across various soil layers and vegetation types within this unique ecosystem remain inadequately *** this study,256 soil samples in 89 sites were collected from the Three River Headwaters Region(TRHR)in China to investigate SOC and TN and to explore the primary factors affecting their distribution,including soil,vegetation,climate,and geography *** results show that SOC and TN contents in 0-20,20-40,40-60,and 60-80 cm soil layers are 24.40,18.03,14.04,12.40 g/kg and 2.46,1.90,1.51,1.17 g/kg,respectively;with higher concentrations observed in the southeastern region compared to the northwest of the ***-way analysis of variance reveals that SOC and TN levels are elevated in the alpine meadow and the alpine shrub relative to the alpine steppe in the 0-60 cm soil *** structural equation model explores that soil water content is the main controlling factor affecting the variation of SOC and ***,the geography,climate,and vegetation factors notably indirectly affect SOC and TN through soil ***,it can effectively improve soil water and nutrient conditions through vegetation restoration,soil improvement,and grazing management,and the change of SOC and TN can be fully understood by establishing monitoring networks to better protect soil carbon and nitrogen.

关键词： controlling factors different soil layers soil organic carbon(SOC) soil total nitrogen(TN) alpine ecosystem the Three River Headwaters Region(TRHR),China

Prospects of elafibranor in treating alcohol-associated liver diseases

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2025年第2期31卷 132-137页

作者： Wei-Tong Cui Hua-Ru Xue dian-Fang Wei Xiao-Yu feng Kai Wang School of Basic Medicine Qilu Medical UniversityZibo 255300Shandong ProvinceChina School of Medical Imaging Qilu Medical UniversityZibo 255300Shandong ProvinceChina

Alcohol-related liver disease(ALD),which is induced by excessive alcohol con-sumption,is a leading cause of liver-related morbidity and *** pa-tients exhibit a spectrum of liver injuries,including hepatic steatosis,inflam-mation,and fibrosis,similar to symptoms of nonalcohol-associated liver diseases such as primary biliary cholangitis,metabolic dysfunction-associated steatotic liver disease,and nonalcoholic *** has been approved for the treatment of primary biliary cholangitis and has been shown to improve symptoms in both animal models and in vitro cell models of metabolic dysfunc-tion-associated steatotic liver disease and nonalcoholic ***,the efficacy of elafibranor in treating ALD remains *** this article,we comment on the recent publication by Koizumi et al that evaluated the effects of elafibranor on liver fibrosis and gut barrier function in an ALD mouse *** findings indicate the potential of elafibranor for ALD treatment,but further experimental investigations and clinical trials are warranted.

关键词： Elafibranor Alcohol-associated liver diseases Peroxisome proliferator-activated receptor Lipid Apoptosis Steatosis Inflammation Fibrosis

Positioning spherical nanoantennas with picometer precision

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Photonics Research 2025年第1期13卷 49-58页

作者： HAIXIANG MA FU feng JIE qiao JIAAN GAN XIAOCONG YUAN Research Center for Frontier Fundamental Studies State Key Laboratory of Extreme Photonics and Instrumentation College of Optical Science and EngineeringZhejiang University Institute of Modern Optics Tianjin Key Laboratory of Micro-scale Optical Information Science and TechnologyNankai University Nanophotonics Research Center Institute of Microscale Optoelectronics&State Key Laboratory of Radio Frequency Heterogeneous IntegrationShenzhen University

Accurate positioning of nanoantennas is critical for their efficient excitation and ***,since nanoantennas are subwavelength nanoparticles,normally smaller than the diffraction limit,measuring their positions presents a significant *** is particularly true for locating the nanoantenna along the z-direction,for which no suitable method currently ***,we have theoretically developed and experimentally validated a novel light field capable of measuring the 3D positions of nanoantennas *** field’s polarization chirality transitions from right-handed to left-handed along a predefined 3D direction at a subwavelength *** a spherical single-element nanoantenna,the polarization components of the scattering field change significantly as the nanoantenna moves,due to the rapid polarization transformation in the excitation light *** analyzing the polarization components of the scattering field,we can achieve positional accuracy of the nanoantenna along the specified direction close to 20 *** work improves the accuracy of transversely distinguishing nanoantennas from 100 pm in conventional methods to 20 ***,the positioning of the nanoantenna along three dimensions is all available as polarization transitions can be predefined along arbitrary3D direction,which is significant for precision measurement and nanoscale optics.

关键词： Circular polarization Cylindrical vector beams Diffraction limit Precision metrology Raman scattering Surface plasmon polaritons

Effect of pharmacological pupil changes on intraocular lens power calculation:a systematic review and Metaanalysis

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

International Journal of Ophthalmology(English edition) 2025年第3期18卷 518-525页

作者： Si-Yi Tan dian-feng Liu Wei-Qi Wang Bing-Song Wang Beijing Tongren Eye Center Beijing Tongren HospitalCapital Medical UniversityBeijing 100730China

AIM:To investigate the effect of pharmacological pupil alterations on intraocular lens(IOL)power ***:A systematic review and Meta-analysis of studies published before December 2023 in the PubMed,Embase,and Cochrane library databases on the accuracy of pharmacological pupil changes on IOL power calculation was *** primary outcome was the results of IOL power calculations before and after the use of *** analyses were performed based on participants’basic characteristics,such as age,axial length(AL),and whether miosis or mydriasis were used as classification criteria for further *** eligible study was evaluated for potential risk of bias by the AHRQ assessment *** study was registered on PROSPERO(CRD 42024497535).RESULTS:A total of 3062 eyes from 21 studies were *** was no significant difference in the IOL power calculation before and after pharmacological pupil changes using any of the Hoffer Q(WMD=0.055,95%CI=-0.046–0.156;P=0.29),SRK/T(WMD=0.003,95%CI=-0.073–0.080;P=0.93),Haigis(WMD=-0.030,95%CI=-0.176–0.116;P=0.69),Holladay 2(WMD=-0.042,95%CI=-0.366–0.282;P=0.80),and Barrett Universal Ⅱ(WMD=0.033,95%CI=-0.061–0.127;P=0.49)*** the measurement of parameters related to IOL power calculation,for either miosis or mydriasis AL(P=0.98 and 0.29,respectively),lens thickness(P=0.96 and 0.13,respectively),and mean keratometry(P=0.90 and 0.86,respectively)did not present significant differences,while anterior chamber depth(P=0.07 and<0.01,respectively)and white-to-white distance(P=0.01 and 0.04,respectively)changed significantly between the two measurements prior and *** the same time,despite there being some participants with the difference between the before and after calculations greater than 0.5 diopter,there was no significant difference in the incidence rate between these ***:There is no significant effect of pharmacological pupil changes on the IOL power ***

关键词： ocular biometry intraocular lens power calculation cataract pharmacological pupil alterations

Demand of Electric Power and Its Forecasting in Iron and Steel Complex

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2006年第5期13卷 21-24页

作者： ZHOU dian-min GAO feng qiao Wei Systems Engineering Institute Xi＇an Jiaotong University Xi＇an 710049 Shaanxi China Baosteel Branch Energy Department Baoshan Iron and Steel Co Ltd Shanghai 200051 China

A systematic study on the electrical load forecasting for large-scale iron and steel companies was made. After analyzing the electrical load＇s characteristics, an algorithm framework for the load forecasting in iron and steel complex was formulated based on model combination and scheme filtration. The algorithm features data quality self- adaptation, convenient forecasting model extension, easy practical application, etc. , and has been successfully applied in Baoshan Iron and Steel Co Ltd, Shanghai, China, resulting in great economic benefit.

关键词： load forecasting steel production model combination scheme filtration