نتایج جستجو برای: ماهواره grace

تعداد نتایج: 10132  

Journal: :Remote Sensing 2018
Michelle E. Miro James S. Famiglietti

NASA’s Gravity Recovery and Climate Experiment (GRACE) has already proven to be a powerful data source for regional groundwater assessments in many areas around the world. However, the applicability of GRACE data products to more localized studies and their utility to water management authorities have been constrained by their limited spatial resolution (~200,000 km2). Researchers have begun to...

Journal: :Remote Sensing 2015
Yanping Cao Zhuotong Nan Guodong Cheng

Drought is a complex natural hazard which can have negative effects on agriculture, economy, and human life. In this paper, the primary goal is to explore the application of the Gravity Recovery and Climate Experiment (GRACE) gravity satellite data for the quantitative investigation of the recent drought dynamic over the arid land of northwestern China, a region with scarce hydrological and met...

2014
Fiona M. Ewings Deborah Ford A. Sarah Walker James Carpenter Andrew Copas

BACKGROUND In HIV infection, dynamic marginal structural models have estimated the optimal CD4 for treatment initiation to minimize AIDS/death. The impact of CD4 observation frequency and grace periods (permitted delay to initiation) on the optimal regimen has not been investigated nor has the performance of dynamic marginal structural models in moderately sized data sets-two issues that are re...

پایان نامه :وزارت علوم، تحقیقات و فناوری - دانشگاه صنعتی خواجه نصیرالدین طوسی - دانشکده نقشه برداری 1389

بازیابی میدان جاذبه زمین در مقیاس جهانی به صورت ضرایب هارمونیک کروی با استفاده از مشاهدات ماهواره های اختصاصی ثقل سنجی، به روش های مختلفی صورت می گیرد. برای بازیابی از روش اندازه گیری شتاب و روش انتگرال انرژی استفاده شده است. در این دو روش، محاسبه بردار شتاب و سرعت ماهواره برای بازیابی میدان جاذبه با استفاده از روش های مشتق گیری عددی ضروری می باشد. روش های مشتق گیری نیوتن، اسپیلاین و تیلور و فو...

2018
Antonio Mauricio dos Santos Cerqueira Junior Luisa Gondim dos Santos Pereira Thiago Menezes Barbosa de Souza Vitor Calixto de Almeida Correia Felipe Kalil Beirão Alexandre Gabriella Sant’Ana Sodré Jessica Gonzalez Suerdieck Felipe Ferreira Marcia Maria Noya Rabelo Luis Cláudio Lemos Correia

BACKGROUND The GRACE Score was derived and validated from a cohort in which octogenarians and nonagenarians were poorly represented. OBJECTIVE To test the accuracy of the GRACE score in predicting in-hospital mortality of very elderly individuals with acute coronary syndromes (ACS). METHODS Prospective observational study conducted in the intensive coronary care unit of a tertiary center fr...

Journal: :European journal of cardio-thoracic surgery : official journal of the European Association for Cardio-thoracic Surgery 2012
Eshan L Senanayake Neil J Howell Jonathan Evans Daniel Ray Jorge Mascaro Timothy R Graham Stephen J Rooney Domenico Pagano

OBJECTIVES The Global Registry of Acute Coronary Events (GRACE) registry reported that the in-hospital risk of death from non-ST elevation myocardial infarction (NSTEMI) is 5%, with an 11% mortality by 6 months. Prospective Registry of Acute Ischaemic Syndromes in the UK demonstrated that the overall risk of death from NSTEMI over 4 years is 25%. In GRACE, while 28% of patients received percuta...

2015
Pamela J. Bradshaw Judith M. Katzenellenbogen Frank M. Sanfilippo Michael S. T. Hobbs Peter L. Thompson Sandra C. Thompson

BACKGROUND Although cardiovascular disease is the major cause of premature death among Indigenous peoples in several advanced economies, no acute coronary syndrome (ACS) risk models have been validated in Indigenous populations. We tested the validity and calibration of three Global Registry of Acute Coronary Events (GRACE) scores among Aboriginal and non-Aboriginal Australians. METHODS GRACE...

Journal: :Arquivos brasileiros de cardiologia 2010
Luis C L Correia Rafael Freitas Ana P Bittencourt Alexandre C Souza Maria C Almeida Jamile Leal José Péricles Esteves

BACKGROUND Although the TIMI score is the one most frequently used in acute coronary syndromes (ACS) without ST-segment elevation, the GRACE score has potential prognostic superiority, as it was created based on an observational registry, part of the variables is treated in a semi-quantitative form and renal function is taken into account in its calculation. OBJECTIVE To test the hypothesis t...

2017
Tamara Jakimov Igor Mrdović Branka Filipović Marija Zdravković Aleksandra Djoković Saša Hinić Nataša Milić Branislav Filipović

AIM To compare the prognostic performance of three major risk scoring systems including global registry for acute coronary events (GRACE), thrombolysis in myocardial infarction (TIMI), and prediction of 30-day major adverse cardiovascular events after primary percutaneous coronary intervention (RISK-PCI). METHODS This single-center retrospective study involved 200 patients with acute coronary...

2009
Juana Paul Moiwo Yonghui Yang Huilong Li Shumin Han Yukun Hu

Water storage change has implications not only for the hydrological cycle, but also for sustainable water resource management in especially semi-arid river basins. Satellite/remote sensing techniques have gained increasing application in monitoring basin and regional hydrological processes in recent decades. In this study, the latest version of GRACE (Gravity Recovery and Climate Experiment) is...

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