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A decomposition approach to the design of a multiferroic memory bit

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Frontiers of Mechanical Engineering 2017年第2期12卷 215-223页

作者： Ruben ACEVEDO Cheng-Yen LIANG gregory P. CARMAN Abdon E. sEPULVEDA Mechanical and Aerospace Engineering Department University ofCalifornia Los Angeles Los Angeles CA 90095-1597 USA

The objective of this paper is to present a methodology for the design of a memory bit to minimize the energy required to write data at the bit level. By straining a ferromagnetic nickel nano-dot by means of a piezoelectric substrate, its magnetization vector rotates between two stable states defined as a 1 and 0 for digital memory. The memory bit geometry, actuation mechanism and voltage control law were used as design variables. The approach used was to decompose the overall design process into simpler sub-problems whose structure can be exploited for a more efficient solution. This method minimizes the number of fully dynamic coupled finite element analyses required to converge to a near optimal design, thus decreasing the computational time for the design process. An in-plane sample design problem is presented to illustrate the advantages and flexibility of the procedure.

关键词： multiferroics nano memory piezoelectric,optimization

Age Dependence of the Menstrual Cycle Correlation Dimension

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Open Journal of Biophysics 2012年第2期2卷 40-45页

作者： gregory N. Derry Paula s. Derry Paula Derry Enterprises in Health Psychology Baltimore USA Physics Department Loyola University Maryland Baltimore USA

Time series analysis, based on the idea that female reproductive endocrine physiology can be construed as a nonlinear dynamical system in a chaotic trajectory, is performed to measure the correlation dimension of the menstrual cycle data from subjects in two different age cohorts. The dimension is computed using a method proposed by Judd (Physica D, vol. 56, 1992, pp. 216-228) that does not assume the correlation dimension to be necessarily constant for all appropriate time scales of the system’s strange attractor. significant time scale differences are found in the behavior of the dimension between the two age cohorts, but at the shortest time scales the correlation dimension converges to the same value, approximately 5.5, in both cases.

关键词： Perimenopause Menstruation Time series Analysis Chaos Correlation Dimension Menopause

shorebird patches as fingerprints of fractal coastline fluctuations due to climate change

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Ecological Processes 2012年第1期1卷 33-49页

作者： Matteo Convertino Adam Bockelie gregory A Kiker Rafael Munoz-Carpena Igor Linkov Department of Agricultural and Biological Engineering-IFAs University of FloridaGainesvilleFLUSA Contractor at the Risk and Decision science Team Environmental LaboratoryEngineer Research and Development CenterUS Army Corps of EngineersConcordMAUSA Florida Climate Institute UF-FSUc/o Frazier Rogers HallGainesvilleFL USA Department of Civil and Environmental Engineering Massachusetts Institute of TechnologyCambridgeMAUSA Department of Earth Atmosphericand Planetary ScienceMassachusetts Institute of TechnologyCambridgeMAUSA Risk and Decision science Team Environmental LaboratoryEngineer Research and Development CenterUS Army Corps of EngineersConcordMAUSA Department of Engineering and Public Policy Carnegie Mellon UniversityPittsburghPAUSA.

Introduction:The Florida coast is one of the most species-rich ecosystems in the *** paper focuses on the sensitivity of the habitat of threatened and endangered shorebirds to sea level rise induced by climate change,and on the relationship of the habitat with the coastline *** consider the resident snowy Plover(Charadrius alexandrinus nivosus),and the migrant Piping Plover(Charadriusmelodus)and Red Knot(Calidris canutus)along the Gulf Coast of Mexico in ***:We analyze and model the coupled dynamics of habitat patches of these imperiled shorebirds and of the shoreline geomorphology dictated by land cover change with consideration of the coastal *** land cover is modeled from 2006 to 2100 as a function of the A1B sea level rise scenario rescaled to 2 *** a maximum-entropy habitat suitability model and a set of macroecological criteria we delineate breeding and wintering patches for each year ***:Evidence of coupled ecogeomorphological dynamics was found by considering the fractal dimension of shorebird occurrence patterns and of the coastline.A scaling relationship between the fractal dimensions of the species patches and of the coastline was *** predicted power law of the patch size emerged from scale-free habitat patterns and was validated against 9 years of *** predict an overall 16%loss of the coastal landforms from *** the changes in the coastline that cause habitat loss,fragmentation,and variations of patch connectivity,shorebirds self-organize by preserving a power-law distribution of the patch size in ***,the probability of finding large patches is predicted to be smaller in 2100 than in *** Piping Plover showed the highest fluctuation in the patch fractal dimension;thus,it is the species at greatest risk of ***:We propose a parsimonious modeling framework to capture macroscale ecogeomorphological patterns of coastal *** results sugg

关键词： Land cover change Coastal wetlands Coastline complexity Fractal dimension Habitat suitability Patches sea level rise

Utility of Kinetic and Kinematic Jumping and Landing Variables as Predictors of Injury Risk: A systematic Review

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Journal of science in sport and Exercise 2020年第4期2卷 287-304页

作者： Jason s.Pedley Rhodri s.Lloyd Paul J.Read Isabel s.Moore Mark De ste Croix gregory D.Myer Jon L.Oliver Youth Physical Development Centre Cardiff Metropolitan UniversityCardiffUK sports Performance Research Institute New Zealand AUT UniversityAucklandNew Zealand Centre for sport science and Human Performance Waikato Institute of TechnologyWaikatoNew Zealand Institute of sport Exercise and HealthUniversity College LondonLondonUK school of sport and Exercise University of GloucestershireGloucesterUK Cardiff school of sport and Health sciences Cardiff Metropolitan UniversityCardiffUK school of sport and Exercise University of GloucestershireCheltenhamUK The sPORT Center Division of Sports MedicineCincinnati Children’s Hospital Medical CenterCincinnatiOHUSA Departments of Pediatrics and Orthopaedic surgery College of MedicineUniversity of CincinnatiCincinnatiOHUSA Emory sport Performance and Research Center Flowery BranchAtlantaGAUSA Emory sports Medicine Center AtlantaGAUSA Department of Orthopaedics Emory University School of MedicineAtlantaGAUSA The Micheli Center for sports Injury Prevention WalthamMAUSA

Purpose Jump-landing assessments provide a means to quantify an individual’s ability to attenuate ground reaction forces,generate lower limb explosive power and maintain joint *** order to identify risk factors that can be targeted through appropriate training interventions,it is necessary to establish which(scalar)objective kinetic,kinematic,and performance measures are most associated with lower-extremity *** Online searches of MEDLINE,sCOPUs,EBsCOHost,sPORTDiscus and PubMed databases were completed for all articles published before March 2020 in accordance with PRIsMA *** 40 articles investigating nine jump-landing assessments were included in this *** 79%of studies using drop jump(n=14)observed an association with future injury,while only 8%of countermovement jump studies(n=13)observed an association with injury *** 57%of studies using unilateral assessments found associations with risk of injury(n=14).studies using performance measures(jump height/distance)as outcome measure were only associated with injury risk in 30%of ***,those using kinetic and/or kinematic analyses(knee abduction moment,knee valgus angle,knee separation distance,peak ground reaction force)found associations with injury in 89%of *** The landing element of jump-landing assessments appears to be superior for identifying individuals at greater risk of injury;likely due to a closer representation of the injury ***,jump-landing assessments that involve attenuation of impact forces such as the drop jump appear most suited for this purpose but should involve assessment of frontal plane knee motion and ground reaction forces.

关键词： Plyometric screening Anterior cruciate ligament Lower-extremity

Lithography and Fabrication of Frictional Tiers on Poly(Dimethylsiloxane) Using Atomic Force Microscopy

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Journal of surface Engineered Materials and Advanced Technology 2012年第3期2卷 233-237页

作者： gregory s. Watson Jolanta A. Watson school of Pharmacy and Molecular sciences and Centre for Biodiscovery and Molecular Development of Therapeutics James Cook University Townsville Australia.

This study investigates controlled micro/nano manipulation of polydimethylsiloxane (PDMs) using Atomic Force Microscopy (AFM). Lithographic results revealed stick-slip phenomena along the slow scan direction. Varying the normal loading force, scan size, scan number and contact conditions allowed the control of certain lithographic outcomes e.g., channel spacing. The PDMs surface experienced significant in-plane deformation in response to the tip-induced lateral force. This displacement increased with increasing loading force, creating greater spacing between channels in the slow scan direction. simultaneous generation of a lateral displacement in the fast scan direction caused a decrease in channel length with increasing loading force due to an increase in static friction with normal force, resulting in a greater surface relaxation, and shorter track length of dynamic friction. By controlling both the loading force and the number of scans over an area, frictional tiers were produced.

关键词： stick-slip PDMs Manipulation Friction Polymer AFM

Applied physics : concepts into practice

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Metformin does not improve survival in patients with hepatocellular carcinoma

2001年

作者： Romine gregory s.

Includes index.

ISBN: (纸本)0135324661

Includes index.

关键词： Physics.

来源：畅想之星图书光盘版（南... 评论

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World Journal of Gastroenterology 2014年第42期20卷 15750-15755页

作者： Mamatha Bhat Roongruedee Chaiteerakij William s Harmsen Cathy D schleck Ju Dong Yang Nasra H Giama Terry M Therneau gregory J Gores Lewis R Roberts Division of Gastroenterology and Hepatology Mayo Clinic College of Medicine Division of Gastroenterology McGill University Health Centre Department of Medicine Chulalongkorn University and King Chulalongkorn Memorial Hospital Thai Red Cross Society Division of Biomedical statistics and Informatics Mayo Clinic College of Medicine

AIM: To assess whether metformin, which has a chemopreventive effect in chronic liver disease, has any chemotherapeutic effect in hepatocellular carcinoma.

关键词： Hepatocellular carcinoma Metformin Diabetes survival Liver disease Lactic acidosis

Inferior outcomes of liver transplantation for hepatocellular carcinoma during early-COVID-19 pandemic in the United states

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World Journal of Hepatology 2023年第4期15卷 554-563页

作者： Inkyu s Lee Kenji Okumura Ryosuke Misawa Hiroshi sogawa gregory Veillette Devon John Thomas Diflo seigo Nishida Abhay Dhand Department of surgery Westchester Medical CenterValhallaNY 10595United States Department of Medicine Westchester Medical CenterValhallaNY 10595United States

BACKGROUND Early in the coronavirus disease 2019(COVID-19)pandemic,there was a significant impact on routine medical care in the United states,including in fields of transplantation and *** To analyze the impact and outcomes of early COVID-19 pandemic on liver transplantation(LT)for hepatocellular carcinoma(HCC)in the United *** WHO declared COVID-19 as a pandemic on March 11,*** retrospectively analyzed data from the United Network for Organ sharing(UNOs)database regarding adult LT with confirmed HCC on explant in 2019 and *** defined pre-COVID period from March 11 to september 11,2019,and early-COVID period as from March 11 to september 11,*** Overall,23.5%fewer LT for HCC were performed during the COVID period(518 vs 675,Ps decrease was most pronounced in the months of March-April 2020 with a rebound in numbers seen from May-July *** LT recipients for HCC,concurrent diagnosis of non-alcoholic steatohepatitis significantly increased(23 vs 16%)and alcoholic liver disease(ALD)significantly decreased(18 vs 22%)during the COVID *** age,gender,BMI,and MELD score were statistically similar between two groups,while waiting list time decreased during the COVID period(279 days vs 300 days,P=0.041).Among pathological characteristics of HCC,vascular invasion was more prominent during COVID period(Ps were the *** the donor age and other characteristics remained same,the distance between donor and recipient hospitals was significantly increased(Psk index was significantly higher(1.68 vs 1.59,Ps,90-day overall and graft survival were the same,but 180-day overall and graft were significantly inferior during COVID period(94.7 vs 97.0%,P=0.048).On multivariable Coxhazard regression analysis,COVID period emerged as a significant risk factor of post-transplant mortality(Hazard ratio 1.85;95%CI:1.28-2.68,P=0.001).CONCLUsION Durin

关键词： Liver transplantation Hepatocellular carcinoma COVID-19 Mortality Graft failure United Network for Organ sharing database

GA-BP Air Quality Evaluation Method Based on Fuzzy Theory

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Computers, Materials & Continua 2019年第1期58卷 215-227页

作者： Ma Ning Jianhe Guan Pingzeng Liu Ziqing Zhang gregory M.P.O’Hare China University of Geoscience Beijing100083China shandong Agricultural University Taian271018China shandong Vocational Institute of Fashion Technology Taian271000China University College Dublin(UCD) BelfieldDublin999014Ireland

With the rapid development of China’s economy,the scale of the city has been continuously expanding,industrial enterprises have been increasing,the discharge of multiple pollutants has reached the top of the world,and the environmental problems become more and more *** air pollution problem is particularly *** quality has become a daily concern for *** order to control air pollution,it is necessary to grasp the air quality situation in an all-round *** is necessary to evaluate air *** results of air quality evaluation can help people know more about air *** this paper,refers to previous research results and different evaluation methods,combined with artificial neural network,fuzzy theory,genetic algorithm,GA-BP hybrid algorithm based on fuzzy theory is proposed to evaluate air *** the same time,for the problem that the two-grade standard of air quality annual evaluation is not suitable for practical application,the four-grade standard for annual air quality evaluation has been proposed,and its practicality has been verified through *** setting contrast experiments and comparing the air quality evaluation model based on standard BP algorithm,it is proved that the fuzzy GA-BP evaluation model is better than the standard BP model,both in efficiency and accuracy.

关键词： Air quality evaluation fuzzy theory genetic algorithm BP neural network