检索结果-南通市图书馆

Fast jet proper motion discovered in a blazar at z=4.72

在线全文

学校读者我要写书评

暂无评论

science Bulletin 2020年第7期65卷 525-530,M0003页

作者： Yingkang Zhang Tao An sándor frey shanghai Astronomical Observatory Chinese Academy of SciencesShanghai 200030China University of Chinese Academy of sciences Beijing 100049China Key Laboratory of Radio Astronomy Chinese Academy of SciencesNanjing 210008China Konkoly Observatory Research Centre for Astronomy and Earth SciencesKonkoly Thege Miklósút 15-17H-1121 BudapestHungary

High-resolution observations of high-redshift(z > 4) radio quasars offer a unique insight into jet kinematics at early cosmological epochs, as well as constraints on cosmological model *** to the general weakness of extremely distant objects and the apparently slow structural changes caused by cosmological time dilation, only a couple of high-redshift quasars(HRQs) have been studied with parsec-scale resolutions, and with limited number of observing epochs. Here we report on very long baseline interferometry(VLBI) observations of a high-redshift blazar J1430 + 4204(z=4.72) in the 8 GHz frequency band at five different epochs spanning 22 years. The source shows a compact core–jet structure with two jet components being identified within 3 milli-arcsecond(mas) scale. The long time span and multiple-epoch data allow for the kinematic studies of the jet components. That results in a jet proper motion of μ(J1) = 0.017 ± 0.002 mas a^-1 and μ(J2) = 0.156 ± 0.015 mas a^-1, respectively. For the fastest-moving outer jet component J2, the corresponding apparent transverse speed is (19.5 ± 1.9) *** inferred bulk jet Lorentz factor C=14.6 ± 3.8 and viewing angle θ=2.2°± 1.6°indicate highly relativistic beaming. The Lorentz factor and apparent proper motion are the highest measured to date among the z > 4 jetted radio sources, while the jet kinematics is still consistent with the cosmological interpretation of quasar redshifts.

关键词： Nuclei High-redshift Radio continuum Quasars Individual J1430+4204

Nickela-electrocatalyzed sulfide and phosphine oxygenations with water

在线全文

学校读者我要写书评

暂无评论

science China Chemistry 2021年第6期64卷 873-874页

作者： Long Yang Johanna frey Lutz Ackermann Institut für Organische und Biomolekulare Chemie Georg-August-Universität GöttingenTammannstrasse 2Göttingen 37077Germany Wöhler Research Institute for sustainable Chemistry(WIsCh) Georg-August-Universität GöttingenTammannstrasse 2Göttingen 37077Germany

Molecular electrochemistry has emerged as an environmentally-friendly *** major recent momentum was gained in electrocatalyzed bond activations by earth-abundant 3 d transition metals[1],cost-effective nickela-electrocatalysis continuous to be underdevelopment for electrocatalysis[2].Nickel is an essential component of metalloproteins involved in catalytic aerobic oxygenation processes,for which nickel-dioxygen species were proposed as the key catalytic species[3].

关键词： catalyzed nickel Nickel

Cherishing the Memory of My Father——In Commemoration of 10th Anniversary of Death of Richard frey

在线全文

学校读者我要写书评

暂无评论

Voice of Friendship 2014年第4期 49-52页

作者： Richard frey

November 16,2014 marked the10th anniversary of the passing of my father Richard *** that time,when sorting out books,writings and other materials left by him,I came to know more of family history and many parts of his life previously unfamiliar to *** has made me miss him all the *** father was born into a welloff middle-class Jewish family

关键词： father sorting Death anniversary marked shanxi Tia

THE IMPACT OF EVOLVING LEED sTANDARDs ON HIsTORIC PREsERVATION PROJECTs

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 Green Building 2008年第4期3卷 21-31页

作者： Barbara A.Campagna Patrice frey the National Trust the National Trust for Historic Preservation

INTRODUCTION At a 2008 forum on climate change,green building,and historic preservation held by the Getty Conservation Institute,one architect ventured the view that there is as much relationship between historic preservation and green building as there is between cheese and street *** is to say,the issue of heritage conservation and protecting our environment are not typically thought of as ***,the term“high performance green building”calls to mind sophisticated contemporary designs that employ cutting-edge new technologies to reduce environmental impacts of buildings;at first blush,historic buildings may not seem to offer much in the way of similarities with such tech-savvy,environmentally friendly buildings.

关键词： LEED venture typically

Prediction-based load balancing and resolution tuning for interactive volume raycasting

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Visual Informatics 2017年第2期1卷 106-117页

作者： Valentin Bruder steffen frey Thomas Ertl University of stuttgart Germany

We present an integrated approach for real-time performance prediction of volume raycasting that we employ for load balancing and sampling resolution *** volume rendering,the usage of acceleration techniques such as empty space skipping and early ray termination,among others,can cause significant variations in rendering performance when users adjust the camera configuration or transfer *** variations in rendering times may result in unpleasant effects such as jerky motions or abruptly reduced responsiveness during interactive *** avoid those effects,we propose an integrated approach to adapt rendering parameters according to performance *** assess performancerelevant data on-the-fly,for which we propose a novel technique to estimate the impact of early ray *** the basis of this data,we introduce a hybrid model,to achieve accurate predictions with minimal computational *** hybrid model incorporates aspects from analytical performance modeling and machine learning,with the goal to combine their respective *** show the applicability of our prediction model for two different use cases:(1)to dynamically steer the sampling density in object and/or image space and(2)to dynamically distribute the workload among several different parallel computing *** approach allows to reliably meet performance requirements such as a user-defined frame rate,even in the case of sudden large changes to the transfer function or the camera orientation.

关键词： Volume raycasting Performance prediction Load balancing

Monomer-activated Copolymerization of Ethylene Oxide and Epichlorohydrin: In situ Kinetics Evidences Tapered Block Copolymer Formation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Journal of Polymer science 2019年第9期37卷 912-918页

作者： Ann-Kathrin Danner Daniel Leibig Lea-Marie Vogt Holger frey Institute of Organic Chemistry Johannes Gutenberg- Universitat Mainz Duesbergweg 10-14 55128 Mainz Germany Graduate school Materials science in Mainz Staudinger Weg 9 55128 Mainz Germany

The monomer-activated anionic ring-opening copolymerization (AROP) of ethylene oxide (EO) and epichlorohydrin (ECH) using tetraoctylammonium bromide as an initiator and triisobutylaluminum (i-Bu3Al) as an activator was studied. The properties of the copolymers as well as the microstructure have been analyzed in detail via an in situ NMR kinetics study. The statistical copolymers exhibited molecular weights ranging from 2350 g·mol^-1 to 38000 g·mol^-1 (measured by sEC, PEG-standards) and moderate dispersities of 1.27-1.44. The thermal property tests revealed both a glass transition and melting for all copolymers, supporting a block-like nature. Applying in situ NMR kinetic measurements, the reactivity ratios of EO and ECH were determined to be strongly disparate, i.e., rEo = 9.2 and rECH = 0.10. This shows that the simple one-pot statistical anionic copolymerization of EO and ECH via the monomer-activated AROP resulted in the formation of strongly tapered, block-like structures. Furthermore, post-polymerization functionalization of the reactive chloromethyl groups by nucleophilic displacement was investigated for the copolymers. Copolymerization of EO and ECH offers a broad platform for further functionalization and therefore the possibility to prepare a variety of multifunctional PEGs.

关键词： Epichlorohydrin Polymerization Ring-opening Copolymerization Reactivity ratios Epoxide

Cherishing the Memory of My Father——In Commemoration of 10th Anniversary of Death of Richard frey

在线全文

学校读者我要写书评

暂无评论

Voice of Friendship 2015年第1期 46-48页

作者： Richard frey Jr.

(Continued from the previous issue)My father,asa Chinesere volutionary of Austri and ecent,wasself-disciplined and low-key all his *** a 65-year revolutionary career in China—his second homeland—he witnessed the War of Resistance Against Japanese Aggression,War of Liberation,New China’s construction and development,the"cultural revolution"and reform and opening up;he underwent all kinds of hardships and suffered from *** unfairly treated and

关键词： revolution witnessed suffered father career Japane

A systematic framework for understanding the microbiome in human health and disease: from basic principles to clinical translation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

signal Transduction and Targeted Therapy 2024年第10期9卷 4476-4511页

作者： Ziqi Ma Tao Zuo Norbert frey Ashraf Yusuf Rangrez Department of Cardiology Angiology and PneumologyUniversity Hospital HeidelbergHeidelbergGermany DZHK(German Centre for Cardiovascular Research) partner site Heidelberg/MannheimHeidelbergGermany Key Laboratory of Human Microbiome and Chronic Diseases(sun Yat-sen University) Ministry of EducationGuangzhouChina Guangdong Institute of Gastroenterology The Sixth Affiliated Hospital of Sun Yat-sen UniversityGuangzhouChina

The human microbiome is a complex and dynamic system that plays important roles in human health and ***,there remain limitations and theoretical gaps in our current understanding of the intricate relationship between microbes and *** this narrative review,we integrate the knowledge and insights from various fields,including anatomy,physiology,immunology,histology,genetics,and evolution,to propose a systematic *** introduces key concepts such as the‘innate and adaptive genomes’,which enhance genetic and evolutionary comprehension of the human ***‘germ-free syndrome’challenges the traditional‘microbes as pathogens’view,advocating for the necessity of microbes for ***‘slave tissue’concept underscores the symbiotic intricacies between human tissues and their microbial counterparts,highlighting the dynamic health implications of microbial interactions.‘Acquired microbial immunity’positions the microbiome as an adjunct to human immune systems,providing a rationale for probiotic therapies and prudent antibiotic ***‘homeostatic reprogramming hypothesis’integrates the microbiome into the internal environment theory,potentially explaining the change in homeostatic indicators ***‘cell-microbe co-ecology model’elucidates the symbiotic regulation affecting cellular balance,while the‘meta-host model’broadens the host definition to include symbiotic ***‘health-illness conversion model’encapsulates the innate and adaptive genomes’interplay and dysbiosis *** aim here is to provide a more focused and coherent understanding of microbiome and highlight future research avenues that could lead to a more effective and efficient healthcare system.

关键词： anatomy immunity integrate

Improved Quantile Convolutional and Recurrent Neural Networks for Electric Vehicle Battery Temperature Prediction

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Big Data Mining and Analytics 2024年第2期7卷 512-530页

作者： Andreas M.Billert Runyao Yu stefan Erschen Michael frey Frank Gauterin Karlsruhe Institute of Technology(KIT) Institute of Vehicle System TechnologyKarlsruhe 76131Germanyand also with Bayerische Motoren Werke(BMW)AGMunich 80788Germany Technical University of Munich(TUM) Munich 80333Germany BMW AG Munich 80788Germany KIT Institute of Vehicle System TechnologyKarlsruhe 76131Germany

The battery thermal management of electric vehicles can be improved using neural networks predicting quantile sequences of the battery *** work extends a method for the development of Quantile Convolutional and Quantile Recurrent Neural Networks(namely Q*NN).Fleet data of 225629 drives are clustered and balanced,simulation data from 971 simulations are augmented before they are combined for training and *** Q*NN hyperparameters are optimized using an efficient Bayesian optimization,before the Q*NN models are compared with regression and quantile regression models for four *** analysis of point-forecast and quantile-related metrics shows the superior performance of the novel Q*NN *** median predictions of the best performing model achieve an average RMsE of 0.66°C and R^(2) of *** predicted 0.99 quantile covers 98.87%of the true values in the test *** conclusion,this work proposes an extended development and comparison of Q*NN models for accurate battery temperature prediction.

关键词： deep learning battery temperature convolutional and recurrent neural network quantile forecasting