检索结果-南通市图书馆

国外油气勘探 1998年第1期10卷 68-75页

作者： fred j.barr 刘玉班东华渤海石油有限公司勘探部

本文论述了海上双检波器海底电缆施工技术的历史、现状、优点和发展方向。它的出现和发展为地震拖缆无法施工的浅水和障碍物区提供了获得高质量地震资料的技术手段,为高精度地完成油气勘探和开发地质任务、完成油气藏开采监测任务奠定... 详细信息

本文论述了海上双检波器海底电缆施工技术的历史、现状、优点和发展方向。它的出现和发展为地震拖缆无法施工的浅水和障碍物区提供了获得高质量地震资料的技术手段,为高精度地完成油气勘探和开发地质任务、完成油气藏开采监测任务奠定了必要的技术基础。

关键词：海底电缆压电式地震检波器地震检波器混响高分辨率

jovian Planet Influence on the Forcing of Sunspot Cycles

在线全文

学校读者我要写书评

暂无评论

World journal of Condensed Matter Physics 2024年第1期14卷 1-9页

作者： fred j. Cadieu Physics Department Queens College of CUNY New York USA

The history of our solar system has been greatly influenced by the fact that there is a large gas giant planet, jupiter that has a nearly circular orbit. This has allowed relics of the early solar system formation to still be observable today. Since jupiter orbits the Sun with a period of approximately 12 years, it has always been thought that this could be connected to the nearly 11-year periodic peak in the number of sunspots observed. In this paper, the Sun and planets are considered to be moving about a center of mass point as the different planets orbit the Sun. This is the action of gravity that holds the solar system together. The center of mass for the jupiter-Sun system actually lies outside the Sun. The four gas giant planets dominate such effects and the four gas giant jovian planets can be projected together to determine an effective distance from the Sun’s center. Taken together these effects do seem to function as a sunspot forcing factor with a periodicity very close to 11 years. These predictions are made without consideration of any details of what is happening in the interior of the Sun. From these estimates, sunspot cycle 25 will be expected to peak in about September-October of 2025. Sunspot cycle 26 should peak in the year March of 2037.

关键词： Sun Cycles Solar System Formation jupiter

Universal optimality of digital nets and lattice designs

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Mathematics 2009年第11期52卷 2309-2320页

作者： HICKERNELL fred j Department of Applied Mathematics Illinois Institute of Technology

This article considers universal optimality of digital nets and lattice designs in a regression model. Based on the equivalence theorem for matrix means and majorization theory,the necessary and sufficient conditions for lattice designs being φp-and universally optimal in trigonometric function and Chebyshev polynomial regression models are obtained. It is shown that digital nets are universally optimal for both complete and incomplete Walsh function regression models under some specified conditions,and are also universally optimal for complete Haar wavelet regression models but may not for incomplete Haar wavelet regression models.

关键词： Chebyshev polynomial Haar wavelet Trigonometric function Walsh function 62K15 62K10

Physical Simulation of Thermally Induced Martensite Formation from Retained Austenite in TRIP Steels

在线全文

学校读者我要写书评

暂无评论

journal of Materials Science & Technology 2003年第Z1期19卷 105-108页

作者： Lie ZHAO fred j. VERMOLEN jilt SIETSMA Sybrand van der ZWAAG Netherlands Institute for Metals Research P.O.Box 5008 2600 GA Delft The Netherlands Department of Materials Science Delft University of Technology R otterdamseweg 137 2628 AL Delft The Netherlands Department of Applied Mathematics Delft University of Technology Mekelweg 4 2628 CD Delft The Netherlands Department of Materials ScienceDelft University of TechnologyRotterdamseweg 1372628 AL DelftThe Netherlands Netherlands Institute for Metals Research P.O.Box 5008 2600 GA Delft The Netherlands Faculty of Aerospace Engineering Delft University of Technology Kluyverweg 1 2629 HS Delft The Netherlands

The present work analyses the total free energy of the material during the martensitic transformation. A general expression for the martensite fraction as a function of temperature is derived, assuming that the nonchemical free energyis proportional to the volume of martensite. This expression indicates that the temperature-dependent martensitefraction can be predicted once the characteristic transformation temperatures and the relation between the chemicalfree energy and temperature of the martensite and austenite are known. An advantage of this development is thatthe proposed equation is valid for all types of relations between the chemical free energy and temperature. Thissimulation is successfully applied to the martensitic transformation upon further cooling of retained austenite in alow-alloyed TRIP steel, in which the relation between chemical free energy and temperature is quadratic and thefraction is determined from a thermo-magnetic measurement.

关键词： Thermodynamics, Martensitic transformation, Retained austenite, TRIP steels.

Dynamics and functions of E‑cadherin complexes in epithelial cell and tissue morphogenesis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Marine Life Science & Technology 2023年第4期5卷 585-601页

作者： Na Zhang Matthias Häring fred Wolf jörg Großhans Deqing Kong Department of Biology Philipps University35043 MarburgGermany Göttingen Campus Institute for Dynamics of Biological Networks(CIDBN) Georg August University Göttingen37073 GöttingenGermany

Cell–cell adhesion is at the center of structure and dynamics of epithelial tissue.E-cadherin–catenin complexes mediate Ca^(2+)-dependent trans-homodimerization and constitute the kernel of adherens *** the basic function of cell–cell adhesion,recent progress sheds light the dynamics and interwind interactions of individual E-cadherin–catenin complex with E-cadherin superclusters,contractile actomyosin and mechanics of the cortex and *** nanoscale architecture of E-cadherin complexes together with cis-interactions and interactions with cortical actomyosin adjust to junctional tension and mechano-transduction by reinforcement or weakening of specific features of the *** post-translational modifications such as phosphorylation and glycosylation have been implicated,their role for specific aspects of in E-cadherin function has remained ***,we provide an overview of the E-cadherin complex in epithelial cell and tissue morphogenesis focusing on nanoscale architectures by super-resolution approaches and post-translational modifications from recent,in particular in vivo,***,we review the computational modelling in E-cadherin complexes and highlight how computational modelling has contributed to a deeper understanding of the E-cadherin complexes.

关键词： Nanoscale architectures Phosphorylation Glycosylation Computational modelling

Direct Load Control of Thermostatically Controlled Loads Based on Sparse Observations Using Deep Reinforcement Learning

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CSEE journal of Power and Energy Systems 2019年第4期5卷 423-432页

作者： frederik Ruelens Bert j.Claessens Peter Vrancx fred Spiessens Geert Deconinck Department of Electrical Engineering KU Leuven/EnergyVille3001 LeuvenBelgium REstore Centrica2600 AntwerpBelgium AI-lab Vrije Universiteit Brussel1050 BrusselsBelgium Vito/EnergyVille 2600 MolBelgium

This paper considers a demand response agent that must find a near-optimal sequence of decisions based on sparse observations of its *** a relevant set of features from these observations is a challenging task and may require substantial domain *** way to tackle this problem is to store sequences of past observations and actions in the state vector,making it high dimensional,and apply techniques from deep *** paper investigates the capabilities of different deep learning techniques,such as convolutional neural networks and recurrent neural networks,to extract relevant features for finding near-optimal policies for a residential heating system and electric water heater that are hindered by sparse *** simulation results indicate that in this specific scenario,feeding sequences of time-series to an Long Short-Term Memory(LSTM)network,which is a specific type of recurrent neural network,achieved a higher performance than stacking these time-series in the input of a convolutional neural network or deep neural network.

关键词： Convolutional networks deep reinforcement learning long short-term memory residential demand response

Universally consistent estimation for stochastic regression models

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 Science Bulletin 1995年第10期40卷 802-807页

作者：安鸿志 Hickernell fred j. 朱力行 Probability Lab Institute of Applied Mathematics Chinese Academy of Sciences Beijing 100080 China Department of Matbematice Hong Kong Baptist University Hong Kong.

Addressed problem Consider multivarate lincar regression model in which x is pdimensional random

关键词： multivariate regression model characteristic function consistency of estimation.

A Metric Approach to Hot Topics in Biomedicine via Keyword Co-occurrence

在线全文

学校读者我要写书评

暂无评论

journal of Data and Information Science 2019年第4期4卷 13-25页

作者： jane H.Qin jean j.Wang fred Y.Ye jiangsu Key Laboratory of Data Engineering and Knowledge Service School of Information ManagementNanjing UniversityNanjing 210023China International joint Informatics Laboratory(IjIL) Nanjing University-University of IllinoisNanjing-ChampaignChina-USA

Purpose:To reveal the research hotpots and relationship among three research hot topics in b iomedicine,namely CRISPR,iPS(induced Pluripotent Stem)cell and Synthetic ***/methodology/approach:We set up their keyword co-occurrence networks with using three indicators and information visualization for metric ***:The results reveal the main research hotspots in the three topics are different,but the overlapping keywords in the three topics indicate that they are mutually integrated and interacted each *** limitations:All analyses use keywords,without any other *** implications:We try to find the information distribution and structure of these three hot topics for revealing their research status and interactions,and for promoting biomedical ***/value:We chose the core keywords in three research hot topics in biomedicine by using h-index.

关键词： Keyword co-occurrence Network analysis Information visualization Biomedicine Hot topics CRISPR-Cas iPS cell Synthetic biology

Towards standardizing retinal optical coherence tomography angiography:a review

在线全文

学校读者我要写书评

暂无评论

Light(Science & Applications) 2022年第4期11卷 520-541页

作者： Danuta M.Sampson Adam M.Dubis fred K.Chen Robert j.Zawadzki David D.Sampson Surrey Biophotonics Centre for VisionSpeech and Signal Processing and School of Biosciences and MedicineThe University of SurreyGuildford GU27XHUK NIHR Biomedical Research Centre at Moorflelds Eye Hospital NHS Trust and UCL Institute of Ophthalmology London EC1V 2PDUK. Centre for Ophthalmology and Visual Science(incorporating Lions Eye Institute) The University of Western AustraliaNedlandsWestern Australia 6009Australia. Department of Ophthalmology Royal Perth HospitalPerthWestern Australia 6000Australia. Ophthalmology Department of SurgeryUniversity of MelbourneMelbourneVictoria 3002Australia. Department of Ophthalmology&Vision Science University of California DavisSacramentoCA 95817USA. Surrey Biophotonics Advanced Technology InstituteSchool of Physics and School of Biosciences and MedicineUniversity of SurreyGuildfordSurrey GU27XHUK

The visualization and assessment of retinal microvasculature are important in the study,diagnosis,monitoring,and guidance of treatment of ocular and systemic *** the introduction of optical coherence tomography angiography(OCTA),it has become possible to visualize the retinal microvasculature volumetrically and without a contrast *** lab-based and commercial clinical instruments,imaging protocols and data analysis methods and metrics,have been applied,often inconsistently,resulting in a confusing picture that represents a major barrier to progress in applying OCTA to reduce the burden of *** data and software sharing,and cross-comparison and pooling of data from different studies are *** inabilities have impeded building the large databases of annotated OCTA images of healthy and diseased retinas that are necessary to study and define characteristics of specific *** paper addresses the steps needed to standardize OCTA imaging of the human retina to address these *** review of the OCTA literature,we identify issues and inconsistencies and propose minimum standards for imaging protocols,data analysis methods,metrics,reporting of findings,and clinical practice and,where this is not possible,we identify areas that require further *** hope that this paper will encourage the unification of imaging protocols in OCTA,promote transparency in the process of data collection,analysis,and reporting,and facilitate increasing the impact of OCTA on retinal healthcare delivery and life science investigations.

关键词： transparency steps inconsistent

A Consistent Model of Terrestrial Planet Magnetospheres and Rotations in Our Solar System

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World journal of Condensed Matter Physics 2021年第2期11卷 13-27页

作者： fred j. Cadieu Physics Department Queens College of CUNY Flushing NY USA

The Sun comprises 99.9% of the solar system mass so it is expected that Sun terrestrial planet interactions can influence the motion as well as the rotation of the terrestrial planets. Gravity affects the planet orbital motions while the changing magnetic fields of the Sun can influence the planet rotations. Planets that manifest a magnetic field dominate any weaker magnetic fields from the Sun, but the rotation of terrestrial planets without a magnetic field interacts with the changing Sun’s field dependent on the electrical conductivity of the core region. It is determined that the average planet density becomes a useful quantity to describe the magnetic state of a terrestrial planet. An average density of 5350 ± 50 kg/m3 is hypothesized to separate planets that develop magnetospheres from those that do not. Planets with higher average densities, Mercury and Earth, developed magnetospheres. While those with lower average densities, Venus and Mars never developed magnetospheres. Terrestrial planets with magnetospheres are the ones to also exhibit plate tectonics. The small size of Mercury led to Mercury only exhibiting a frozen in magnetization of potentially magnetic regions. The lack of magnetospheres as well as lack of plate tectonics prevented the continual transfer of core heat to the surface that limited the surface vulcanism to an initial phase. For Venus, it meant that the surface regions would only sporadically convulse. In this picture, the apparent anomalous axial rotation of Venus is a natural consequence of the rotation of the Sun. For Mars with relatively low surface temperatures, it meant that there was little heat exchange through the crust that would allow the lower crust to retain large amounts of water. For Mars to have initially had flowing liquid water required that the atmosphere at that time contained high concentrations of infrared absorbing gases at least as compared to the present level of infrared absorbing gases on the Earth.

关键词： Earth Mercury Venus Mars Magnetic Fields Sun Early Solar System Plate Tectonics