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Science China(Technological Sciences) 2009年第1期52卷 172-175页

作者： Allison john Research & Advanced Engineering Department Scientific Research Laboratory Ford Motor Company

The current paper focuses on the influence of the process parameters on the peak values of the inter-facial heat transfer coefficient (IHTC) at metal/die interface during high pressure die casting (HPDC) process. A "step shape" casting and AM50 alloy were used during the experiment. The IHTC was de-termined by solving the inverse thermal problem based on the measured temperature inside the die. Results show that the initial die surface temperature (IDST, TDI) has a dominant influence while the casting pressure and fast shot velocity have a secondary influence on the IHTC peak values. By curve fitting, it was found that the IHTC peak value (hmax) changes as a function of the IDST in a manner of hmax =eαTγDI. Such relationship between the IHTC peak value and the IDST can also be found when the casting alloy is ADC12, indicating that this phenomenon is a common characteristic in the HPDC process.

关键词： high pressure die casting interfacial heat transfer coefficient AM50 ADC12

GANscan:continuous scanning microscopy using deep learning deblurring

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Light(Science & Applications) 2022年第10期11卷 2378-2387页

作者： Michael john Fanous Gabriel Popescu Quantitative Light Imaging Laboratory Beckman Institute for Advanced Science and TechnologyUniversity of Illinois at Urbana-ChampaignUrbanaIL 61801USA Department of Bioengineering University of Illinois at Urbana-Champaign306 N.Wright StreetUrbanaIL 61801USA Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign306 N.Wright StreetUrbanaIL 61801USA

Most whole slide imaging(WSI)systems today rely on the"stop-and-stare"approach,where,at each field of view,the scanning stage is brought to a complete stop before the camera snaps a *** procedure ensures that each image is free of motion blur,which comes at the expense of long acquisition *** order to speed up the acquisition process,especially for large scanning areas,such as pathology slides,we developed an acquisition method in which the data is acquired continuously while the stage is moving at high *** generative adversarial networks(GANs),we demonstrate this ultra-fast imaging approach,referred to as GANscan,which restores sharp images from motion blurred *** allows us to complete image acquisitions at 30x the throughput of stop-and-stare *** method is implemented on a Zeiss Axio Observer Z1 microscope,requires no specialized hardware,and accomplishes successful reconstructions at stage speeds of up to 5000 μm/*** validate the proposed method by imaging H&E stained tissue *** method not only retrieves crisp images from fast,continuous scans,but also adjusts for defocusing that occurs during scanning within+/-5 μ*** a consumer GPU,the inference runs at<20 ms/image.

关键词： hardware continuous image

A simulation-based nonlinear site amplification model for ground-motion prediction equations in Japan

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Earthquake Engineering and Engineering Vibration 2021年第4期20卷 843-862页

作者： Ruibin Hou john Xingquan Zhao School of Civil Engineering Southwest Jiaotong UniversityChengdu 610031China Key Laboratory of Building Structural Retrofitting and Underground Space Engineering Ministry of EducationShandong Jianzhu UniversityJi′nan 250101China

In this manuscript we present a nonlinear site amplification model for ground-motion prediction equations(GMPEs)in Japan,using a site period-based site class and a site impedance ratio as site *** used a large number of shear-wave velocity profiles from the Kiban-Kyoshin network(KiK-net)and the Kyoshin network(K-NET)to construct the one-dimensional(1D)numerical *** strong-motion records from rock-sites in Japan with different earthquake categories and taken from the Pacific Earthquake Engineering Research Center dataset were used in this *** fit a set of 1D site amplification models using the spectral amplification ratios derived from 1D equivalent linear *** of site impedance ratios for both linear and nonlinear site response were included in the 1D *** 1D model could be implemented into GMPEs using a new proposed adjustment *** adjusted site amplification ratios retain the nonlinear characteristics of the 1D model for strong motions and match the linear amplification ratio in GMPE for weak *** nonlinearity of the present site model is reasonably similar to that of the historical models,and the present site model could satisfactorily capture the nonlinear site response in empirical data.

关键词： nonlinear site amplification model ground-motion prediction equations site class site impedance ratio site response analysis

Ionospheric longitudinal variations at midlatitudes: Incoherent scatter radar observation at Millstone Hill

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Science China(Technological Sciences) 2012年第5期55卷 1153-1160页

作者： COSTER Anthea HOLT john FOSTER john ERICKSON Phil MIT Haystack Observatory Off Route 40 Westford MA 01866 USA

Incoherent scatter radar （ISR） extra-wide coverage experiments during the period of 1978-2011 at Millstone Hill are used to investigate longitudinal differences in electron density. This work is motivated by a recent finding of the US east-west coast difference in TEC suggesting a combined effect of changing geomagnetic declination and zonal winds. The current study pro- vides strong supporting evidence of the longitudinal change and the plausible mechanism by examining the climatology of electron density Ne on both east and west sides of the radar with a longitude separation of up to 40% for different heights within 300-450 kin. Main findings include： 1） The east-west difference can be up to 60% and varies over the course of the day, being positive （East side Ne 〉 West side Ne） in the late evening, and negative （West side Ne 〉 East side Ne） in the pre-noon. 2） The east-west difference exists throughout the year. The positive （relative） difference is most pronounced in winter; the negative （relative） difference is most pronounced in early spring and later summer. 3） The east-west difference tends to enhance toward decreasing solar activity, however, with some seasonal dependence; the enhancements in the positive and negative differences do not take place simultaneously. 4） Both times of largest positive and largest negative east-west differences in Ne are earlier in summer and later in winter. The two times differ by 12-13 h, which remains constant throughout the year. 5） Variations at different heights from 300-450 km are similar. Zonal wind climatology above Millstone Hill is found to be perfectly consistent with what is expected based on the electron density difference between the east and west sides of the site. The magnetic declination-zonal wind mechanism is true for other longitude sectors as well, and may be used to understand longitudinal variations elsewhere. It may also be used to derive thermospheric zonal winds.

关键词： midlatitude ionosphere geomagnetic declination thermospheric zonal winds longitudinal variation incoherent scatterradar

Unleashing the Power of Moiré Materials in Neuromorphic Computing

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Chinese Physics Letters 2023年第12期40卷 131-132页

作者： john Paul Strachan Peter Grünberg Institute(PGI-14) Neuromorphic Compute NodesForschungszentrum JülichJülichGermany and RWTH Aachen UniversityAachenGermany

Reservoir computing has been an intriguing paradigm in the field of artificial intelligence and machine learning that draws inspiration from the complex dynamics of recurrent neural networks found in biological systems. Unlike traditional neural networks, reservoir computing separates the training of a fixed, randomly connected ‘reservoir’layer from a simpler ‘readout’ layer. This distinctive architecture allows the reservoir to process information in a highly dynamic and nonlinear manner.

关键词： networks neural computing

Stress interactions between normal faults and adjacent strike-slip faults of 1997 Jiashi earthquake swarm

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Science China Earth Sciences 2008年第3期51卷 431-440页

作者： CHEN john YongShun Department of Geophysics School of Earth and Space Sciences Peking University China

During a 4-month period starting from 21 January, 1997, an earthquake swarm of seven major events (Ms≥6.0) struck the Jiashi region at the northwestern corner of the Tarim Basin in Xinjiang,, China. Previous relocation studies suggested that these strong earthquakes had occurred along at least two parallel rupture zones. According to the relocated hypocenters and focal mechanisms of the events, we have constructed fault models for these seven earthquakes to calculate the Coulomb stress changes produced by each of these events. Furthermore, we extended our model calculations to include an ad- jacent 1996 Ms=6.9 Artushi earthquake, which occurred one year before the Jiashi earthquake swarm. Our calculations show that the Coulomb stress change caused by the preceding events was around 0.05 MPa at the hypocenter of the 4th event, and higher than 0.08 MPa at the hypocenters of the 2nd, 3rd, 5th and 6th events. Our results reveal a Coulomb stress interactive cycle of earthquake triggering between two adjacent normal and strike-slip faults.

关键词： Jiashi earthquake swarm normal fault strike-slip fault Coulomb stress change earthquake triggering

Integrated nanoelectronic-photonic devices and bioresorbable materials

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Nano Research 2021年第9期14卷 2885-2887页

作者： john A.Rogers Departments of Materials Science and Engineering Biomedical Engineering and Neurological SurgerySimpson Querrey Institute for BioelectronicsNorthwestern UniversityEvanstonIL 60208USA

I am honored receive,with ***,this years Nano Research *** my case,the recognition is largely an acknowledgement of the scientific advances achieved by a diverse set of graduate students,undergraduates and postdoctoral fellows as they passed through my group over the years-talented,dedicated,creative,collaborative people,of the very highest *** of these former group members,each now leading large and highly successful academic research programs of their own,contributed outstanding articles to this special issue-21 in total!I would like to extend my special thanks to them-I feel a strong sense of pride and joy in their many impressive accomplishments as pioneering,independent *** topics of these articles span a wide range,as a powerful set of projects at the forefront of nanoscience and nanotechnology,briefly summarized by topic area in the following.

关键词： electronic accomplishment summarized

Testing discrete symmetries at a super τ-charm factory

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Frontiers of physics 2016年第1期11卷 17-25页

作者： Adrian john Bevan Particle Physics Research Centre Queen Mary University of London Mile End Road London E1 4NS UK

Tests of discrete symmetry violation have played an important role in understanding the structure of weak interactions in the Standard Model of particle physics. Historically, these measurements have been extensively performed in experiments with large samples of K and B mesons. A high luminosity τ-charm facility presents physicists with the opportunity to comprehensively explore discrete symmetry violation and test the Standard Model using τ leptons, charm mesons, and charmed baryons. This paper discusses several possible measurements for a future T-charm factory.

关键词： discrete symmetries P C T CP CPT violation

Novel approach for evaluation of service reliability for electricity customers

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Science China(Technological Sciences) 2009年第9期52卷 2585-2590页

作者： JIANG john N School of Electrical and Computer Engineering University of OklahomaNorman OK 73019 USA

Understanding reliability value for electricity customer is important to market-based reliability management. This paper proposes a novel approach to evaluate the reliability for electricity customers by using indifference curve between economic compensation for power interruption and service reliability of electricity. Indifference curve is formed by calculating different planning schemes of network expansion for different reliability requirements of customers, which reveals the information about economic values for different reliability levels for electricity customers, so that the reliability based on market supply demand mechanism can be established and economic signals can be provided for reliability management and enhancement.

关键词： power systems electricity market reliability customers’ outage cost indifference curve

Search for a natural scientific measure of economy

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Frontiers of Environmental Science & Engineering 2011年第1期5卷 111-118页

作者： john E COULTER Xiwangzhuang Shuangqing RdHaidianBeijing 100084China

Through human history,wealth has been measured in grain,gold,and,now,*** counterfeiting of coins and notes goes back a long way,it is only with electronic financial accounting in a global economy tainted by toxic loans and imaginary funds that there is an urgency to search for a realistic objective way to monitor and regulate what we are doing to our Earth and *** schemes using analysis of utility functions,oil equivalents,entropy,energy,and other units have been tried and,while helping to understand some basic processes and flows,have always been swamped by the machinations of financiers and the attention big sums of money ***,the concept of exergy,pioneered in Eastern Europe in the 1950s,is being researched,developed,and applied,especially in China,driven by the desperation to measure the reality beyond the twin specters of global financial and environmental crises.A rough inventory of the matter in the biosphere at the coordinate details of an angstrom and an appreciation of how humans harness and manipulate electromagnetic forces can be enlightening as to what is and is not *** that understanding,any financial estimate and proposed stimulus packages or IMF reform will be wildly wrong and may even be headed in the wrong direction.

关键词： climate change financial crisis energy exergy environment