检索结果-南通市图书馆

Journal of Earth Science 2015年第6期26卷 791-798页

作者： john H.Bradford Center for Geophysical investigation of the Shallow Subsurface Boise State University

With increased computational power, reverse-time prestack depth migration（RT-PSDM） has become a preferred imaging tool in seismic exploration, yet its use has remained relatively limited in ground-penetrating radar（GPR） applications. Complex topography alters the wavefield kinematics making for a challenging imaging problem. Model simulations show that topographic variation can substantially distort reflection amplitudes due to irregular wavefield spreading, attenuation anomalies due to irregular path lengths, and focusing and defocusing effects at the surface. The effects are magnified when the topographic variations are on the same order as the depth of investigation––a situation that is often encountered in GPR investigations. Here, i use a full wave-equation RT-PSDM algorithm to image GPR data in the presence of large topographic variability relative to the depth of investigation. The source and receiver wavefields are propagated directly from the topographic surface and this approach inherently corrects for irregular kinematics, spreading and attenuation. The results show that when GPR data are acquired in areas of extreme topography, RT-PSDM can accurately reconstruct reflector geometry as well as reflection amplitude.

关键词： reverse-time prestack depth migration ground-penetrating radar topography wavefield reflector geometry reflection amplitude.

Application of Artificial Neural Networks to Rainfall Forecasting in Queensland,Australia

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Advances in Atmospheric Sciences 2012年第4期29卷 717-730页

作者： john ABBOT Jennifer MAROHASY Centre for Plant and Water Science Central Queensland UniversityBruce Highway Rockhampton Q.4702Australia

in this study, the application of artificial intelligence to monthly and seasonal rainfall forecasting in Queensland, Australia, was assessed by inputting recognized climate indices, monthly historical rainfall data, and atmospheric temperatures into a prototype stand-alone, dynamic, recurrent, time-delay, artificial neural network. Outputs, as monthly rainfall forecasts 3 months in advance for the period 1993 to 2009, were compared with observed rainfall data using time-series plots, root mean squared error （RMSE）, and Pearson correlation coefficients. A comparison of RMSE values with forecasts generated by the Australian Bureau of Meteorology＇s Predictive Ocean Atmosphere Model for Australia （POAMA）-i.5 general circulation model （GCM） indicated that the prototype achieved a lower RMSE for 16 of the 17 sites compared. The application of artificial neural networks to rainfall forecasting was reviewed. The prototype design is considered preliminary, with potential for significant improvement such as inclusion of output from GCMs and experimentation with other input attributes.

关键词： general circulation models artificial neural networks rainfall forecast

Characteristics,management and response to alteplase in China versus non-China participants of the ENCHANTED trial

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Stroke & Vascular Neurology 2017年第2期2卷 53-58页

作者： Lily Song Xia Wang Thompson Robinson Richard i Lindley Hisatomi Arima Pablo M Lavados Xiaoying Chen john Chalmers Craig S Anderson The George institute for Global Health at Peking University Health Science Center BeijingChina Department of Neurology 85 Hospital of People’s Liberation ArmyShanghaiChina The George institute for Global Health The University of New South WalesSydneyAustralia Department of Cardiovascular Sciences and NiHR Biomedical Research Unit for Cardiovascular Sciences University of LeicesterLeicesterUK Department of Preventive Medicine and Public Health Faculty of MedicineFukuoka UniversityFukuokaJapan Clínica Alemana de Santiago Universidad del DesarrolloConcepciónChile Departamento de Ciencias Neurológicas Facultad de MedicinaUniversidad de ChileConcepciónChile Neurology Department Royal Prince Alfred HospitalSydneyAustralia

Background The characteristics of patients with acute ischaemic stroke(AiS)and their management vary across regions,which may influence *** examined for differential patterns of outcome between China and non-China participants of the ENhanced Control of Hypertension And Thrombolysis strokE stuDy(ENCHANTED),which tested different alteplase doses in *** ENCHANTED was an international,multicentre,open,blinded-endpoint trial of the effects of low-dose(0.6 mg/kg)versus standard-dose(0.9 mg/kg)intravenous alteplase on 90-day disability outcomes and symptomatic intracerebral haemorrhage(siCH)in 3310 patients with *** Participants(n=1419,48%)in China were younger,and more often male,hypertensive and with prior stroke and coronary artery disease,but less likely to have atrial fibrillation and use antihypertensive,antithrombotic and lipid-lowering agents,compared with non-China patients with *** China participants had more AiS due to large artery occlusion,were treated later and had differing ancillary management,there was no significant difference in 90-day modified Rankin scale scores 2–6(55.6% vs 47.8%;OR,adjusted for baseline and management factors 0.87(95%Ci 0.71 to 1.07;p=0.20))and risk of siCH(Safe implementation of Thrombolysis in Stroke-Monitoring Study criteria:1.4% vs 1.8%;p=0.12)compared with non-China *** was no heterogeneity in the treatment effects of low-dose versus standard-dose alteplase between China and non-China *** Patients with AiS recruited to the ENCHANTED trial in China had similar outcomes in response to thrombolysis treatment despite significantly differing demographic,clinical and management factors to patients with AiS in other regions.

关键词： hypertensive doses younger

interaction between tumor stage and age on survival outcomes of patients with anaplastic thyroid cancer

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 Experimental Medicine 2024年第3期14卷 90-100页

作者： Ayrton i Bangolo Auda Auda john Bukasa-Kakamba Nayan Bhakta Shraboni Dey Anupriya lilhori Gowry Reddy Budoor Alqinai Aman Sidiqui imranjot Sekhon Barbare Khatiashvili iqra Abbas Sandra Kunnel Amer Jarri Emelyn Martinez Deborah Daoud ishita Gupta Harshini Gompa Silvanna Pender Dana Aljaberi Hamed Aljanaahi Sandra S Kunnel Yingxia Xiao Yoontae Jung Sneha Nagpaul Afshan Naz Tejaswee Mallela Phyo Maung Maung ibtihal Y Khalaf Soobee Kim Roua Alrestom Aditya Gajera Hiba Alkealy Deepti Kansal Sonam Dhall Sanya Satheesha Simcha Weissman Pierre Fwelo Department of internal Medicine Palisades Medical CenterNorth BergenNJ 07047United States Department of Medicine Palisades Medical CenterNorth BergenNJ 07047United States Department of Endocrine and Metabolic Disorders University of KinshasaKinshasa KinshasaCongo Department of Epidemiology Human Geneticsand Environmental SciencesUTHealth School of Public HealthHoustonTX 77030United States

BACKGROUND Anaplastic thyroid cancer(ATC)is an aggressive,rare malignancy associated with rapid growth and metastasis,and a very poor *** investigated the clinical characteristics,survival outcomes and independent prognostic factors associated with anaplastic thyroid *** To assess to what extent the interaction between age and tumor stage affects *** A total of 622 patients diagnosed with anaplastic thyroid cancer,between 2010 and 2017 were enrolled in our study by retrieving data from the Surveillance,Epidemiology and End Results(SEER)*** analyzed demographics,clinical characteristics,overall mortality(OM)and cancer specific mortality(CSM)of *** with a P valueincorporated into the multivariate cox model to determine the independent prognostic ***,we analyzed the interaction between age and tumor stage on *** in the multivariate analyses,the divorced/separated population had a lower OM[hazard ratio(HR)=0.63,95%Ci:0.42-0.94,Pi:0.40-0.92,Pigher in tumors with direct extension only(HR=6.26,95%Ci:1.29-30.42,Pith distant spread(HR=5.73,95%Ci:1.34-24.51,Pigher in tumors with direct extension(HR=5.05,95%Ci:1.05-24.19,Pith distant spread(HR=4.57,95%Ci:1.08-19.29,Pity was not adversely affected by lymph node *** was lower in patients who received radiation(HR=0.66,95%Ci:0.53-0.83,Pi:0.50-0.79,Pi:0.43-0.66,Pin patient who received radiation(HR=0.64,95%Ci:0.51-0.81,Pi:0.50-0.78,Pi:0.41-0.63,Pignificant interaction between age and tumor stage that affected *** in this large US SEER database retrospective study,we found the mortality to be higher in advanced stage tumors with direct extensi

关键词： Undifferentiated thyroid cancer Survival outcome Prognosis Metastasis Clinical trials interaction

Qingdao 2010:Facilitating the dissemination of new discoveries in Crustacean Research

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

integrative Zoology 2011年第1期6卷 1-2页

作者： john Buckeridge Earth and Oceanic Systems Research Group RMiT University Melbourne Vic.3001 Australia

Over the period 20-25 June,2010,i had the good fortune to attend the Seventh international Crustacean Congress in Qingdao,*** specific conferences are very special events-giving us the opportunity to both share knowledge and to learn from colleagues who are interested in the narrower field(s)in which we are ***,with recent advances in molecular biology and microscopy,carcinology,which comprises crustacean biology,palaeontology,distribution and evolution,is now so diverse that sub-disciplines within it are becoming increasingly ***,this is so much so that except in meetings such as this congress,many of us lack real opportunities to discuss and debate other perspectives of our *** meeting at Qingdao provided such a venue,and it was particularly enjoyable.

关键词： Crustacea Qingdao narrow

implementation planning for lung cancer screening in China

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Precision Clinical Medicine 2019年第1期2卷 13-44页

作者： Yue i.Cheng Michael P.A.Davies Dan Liu Weimin Li john K.Field Lung Cancer Research Group Department of Molecular and Clinical Cancer MedicineInstitute of Translational MedicineUniversity of LiverpoolWilliam Henry Duncan Building6 West Derby StreetLiverpool L78TXUnited Kingdom Department of Respiratory and Critical Care Medicine West China HospitalSichuan UniversityChengdu 610041China

Lung cancer is the leading cause of cancer-related deaths in China,with over 690000 lung cancer deaths estimated in *** mortality has increased about five-fold from the mid-1970s to the *** cancer lowdose computerized tomography(LDCT)screening in smokers was shown to improve survival in the US National Lung Screening Trial,and more recently in the European NELSON ***,although the predominant risk factor,smoking contributes to a lower fraction of lung cancers in China than in the UK and ***,it is necessary to establish Chinese-specific screening *** have been 23 associated programmes completed or still ongoing in China since the 1980s,mainly after 2000;and one has recently been ***,their entry criteria are not *** of the Chinese programmes have reported preliminary results only,which demonstrated a different high-risk subpopulation of lung cancer in *** concerning LDCT screening implementation is based on results of randomized controlled trials outside *** screening programmes combining tobacco control would produce more *** recruitment(***-based selection),screening protocol,nodule management and costeffectiveness are discussed in *** China,the high-risk subpopulation eligible for lung cancer screening has not as yet been confirmed,as all the risk parameters have not as yet been *** evidence on best practice for implementation of lung cancer screening has been accumulating in other countries,further research in China is urgently required,as China is now facing a lung cancer epidemic.

关键词： lung cancer China screening recommendation low-dose computerized tomography risk factor tobacco control pulmonary nodule management

Mechanisms, prevention and clinical implications of nonsteroidal anti-inflammatory drug-enteropathy

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 Gastroenterology 2013年第12期19卷 1861-1876页

作者： john L Wallace Farncombe Family Digestive Health Research institute McMaster University inflammation Research Network University of Calgary

This article reviews the latest developments in understanding the pathogenesis, detection and treatment of small intestinal damage and bleeding caused by nonsteroidal anti-inflammatory drugs (NSAiDs). With improvements in the detection of NSAiD-induced damage in the small intestine, it is now clear that this injury and the associated bleeding occurs more frequently than that occurring in the stomach and duodenum, and can also be regarded as more dangerous. However, there are no proven-effective therapies for NSAiD-enteropathy, and detection remains a challenge, particularly because of the poor correlation between tissue injury and symptoms. Moreover, recent studies suggest that commonly used drugs for protecting the upper gastrointestinal tract (i.e., proton pump inhibitors) can significantly worsen NSAiD-induced damage in the small intestine. The pathogenesis of NSAiD-enteropathy is complex, but studies in animal models are shedding light on the key factors that contribute to ulceration and bleeding, and are providing clues to the development of effective therapies and prevention strategies. Novel NSAiDs that do not cause small intestinal damage in animal models offer hope for a solution to this serious adverse effect of one of the most widely used classes of drugs.

关键词： Anti-inflammatory Ulcer Prostaglandin Non-steroidal Bleeding intestinal Bile Enterohepatic Bacteria Hydrogen sulfide Aspirin Hemorrhage

The Ethico-Political Universe of ChatGPT

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 Social Computing 2023年第1期4卷 1-11页

作者： john Levi Martin john Levi Martin is with the Sociology Department University of ChicagoChicagoIL 60637USA

There have been widespread concerns about two aspects of the current explosion of predictive text models and other algorithm-based computational *** one hand,it is often insisted that Artificial intelligence(Ai)should be made“ethical”,and software providers take this seriously,attempting to make sure that their tools are not used to facilitate grossly criminal or widely condemned *** the other hand,it is also widely understood that those who create these tools have a responsibility to ensure that they are“unbiased”,as opposed to simply helping one side in political contestation define their perspectives as reality for ***,these two goals cannot be jointly satisfied,as there are perhaps no ethical prescriptions worthy of notice that are not contested by *** i investigate the current ethico-political sensibility of ChatGPT,demonstrating that the very attempt to give it an ethical keel has also given it a measurably left position in the political space and a concomitant position in social space among the privileged.

关键词： algorithmic bias values machine ethics human-machine interaction

Applications and theoretical perspectives of artificial intelligence in the rate of penetration

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Petroleum 2022年第2期8卷 237-251页

作者： Chinedu i.Ossai Ugochukwu i.Duru Faculty of Health Arts and DesignSwinburne UniversityJohn Street HawthornVictoria3122Australia Federal University of Technology Owerri Nigeria

Artificial intelligence(Ai)is becoming popular for the Rate of Penetration(ROP)estimation,hence,the need to study the best techniques and their advantages over empirical *** literatures were analysed to determine the prevalence of Ai in ROP computation and compare the computation accuracies with empirical *** Neural Network(ANN)accounted for over 92%of the Ai techniques used for ROP computation and Weight on Bit(WOB)mostly influenced the computation *** accuracy of Ai algorithms is better than the empirical models thus,will improve the drilling efficiency,reduce cost and enhance the development of pad wells.

关键词： Artificial intelligence Drilling operations Rate of penetration optimization Artificial neural network Weight on bit

Cross inhibition improves activity selection when switching incurs time costs

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Current Zoology 2015年第2期61卷 242-250页

作者： James A. R. MARSHALL Angelique FAVR EAU-PEiGN Lutz FROMHAGE john M. MCNAMARA Liarme F. S. MEAH Alasdair i. HOUSTON Department of Computer Science and University of Sheffield Sheffield S 1 4DP UK iNRA UMR791 Modelisation Systemique Appliquee aux Ruminants F-75005 Paris France Department of Biological and Environmental Science P.O. Box 35 FI-40014 University of Jyvaskyla Finland School of Mathematics University of Bristol University Walk Bristol BS8 1TW UK School of Biological Sciences University of Bristol Bristol Life Sciences Building 24 Tyndall Avenue Bristol BS8 1TQ UK AgroParisTech UMR Modelisation Systemique Appliquee anx Ruminants F-75005 Paris France

We consider a behavioural model of an animal choosing between two activities, based on positive feedback, and exa- mine the effect of introducing cross inhibition between the motivations for the two activities. While cross-inhibition has pre- viously been included in models of decision making, the question of what benefit it may provide to an animal＇s activity selection behaviour has not previously been studied. in neuroscience and in collective behaviour cross-inhibition, and other equivalent means of coupling evidence-accumulating pathways, have been shown to approximate statistically-optimal decision-making and to adaptively break deadlock, thereby improving decision performance. Switching between activities is an ongoing decision process yet here we also find that cross-inhibition robustly improves its efficiency, by reducing the frequency of costly switches between behaviours .

关键词： Crossinhibition Geometric framework Foraging Activity selection Neuroscience Behaviour