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article

Evaluating AquaCrop model for simulating production of amaranthus (Amaranthus cruentus) a leafy vegetable, under irrigation and rainfed conditions

Z.A. Bello, S. Walker

Agricultural and Forest Meteorology > 2017 > 247 > C > 300-310

Amaranthus (Amaranthus spp.), a leafy vegetable in South Africa, has the potential to be cultivated as a crop, but is rarely cultivated because it easily grows naturally on any waste land. The crop tolerates adverse environmental conditions, but performs better with application of water and soil organic or inorganic fertilizers. The AquaCrop crop model was calibrated and validated for amaranthus under...

article

Design of a novel high performance Schottky barrier based compact transmission gate

Sunil Kumar, Sajad A. Loan, Abdulrahman M. Alamoud

Superlattices and Microstructures > 2016 > 92 > C > 337-347

In this work, we propose and simulate a novel single transistor based transmission gate. The proposed device is a double gate Schottky device employing a stack of platinum silicide and erbium silicide materials to realize metal source and drain regions. The novelty of the proposed device lies in its ability to realize both n and p type modes simultaneously, which is normally being realized by a parallel...

article

Coordinating and Monitoring Quality Information for the Copernicus Services: Case Study with Optical Data Abstract\uFFFD

Sebastien Saunier, Nathalie Camlong, Patrick Floissac, Emmanuel Hillairet, more

IEEE Geoscience and Remote Sensing Magazine > 2015 > 3 > 2 > 24 - 40

One of the key elements of Copernicus is its Space Component (CSC). Beyond the development of the Sentinel missions, the CSC also entails the coordination of assets made available by the data providers of Copernicus Contributing Mission (CCMs) to implement a synergistic and complete operational system-of-systems in Europe for the provision of Earth Observation (EO) data. In the framework of Copernicus,...

article

Enhancing the calibration of an urban growth model using a memetic algorithm

William Veerbeek, Assela Pathirana, Richard Ashley, Chris Zevenbergen, more

Computers, Environment and Urban Systems > 2015 > 50 > Complete > 53-65

At present, many approaches and models have been developed to perform spatially explicit simulations that mimic observed land use and land cover changes (LULC) for a given area. Calibration of such models is often performed using comparatively standard ‘off-the-shelf’ machine-learning algorithms that are not necessarily suited to perform effectively within the model’s implementation. This method becomes...

article

Reliable support: Measuring calibration of likelihood ratios

Daniel Ramos, Joaquin Gonzalez-Rodriguez, D. Ramos, J. Gonzalez-Rodriguez

Forensic Science International > 2013 > 230 > 1-3 > 156-169

Calculation of likelihood ratios (LR) in evidence evaluation still presents major challenges in many forensic disciplines: for instance, an incorrect selection of databases, a bad choice of statistical models, low quantity and bad quality of the evidence are factors that may lead to likelihood ratios supporting the wrong proposition in a given case. However, measuring performance of LR values is not...

article

Surveillance du bloc neuromusculaire par accéléromyographie : concepts, applications et limites d’utilisation

T. Fuchs-Buder, D. Sirieix, D. Schmartz, B. Plaud

Annales francaises d'anesthesie et de reanimation > 2012 > 31 > 11 > 922-925

Selon une enquête récente réalisée auprès des anesthésistes en France, le monitorage de la curarisation était utilisé dans près de la moitié des cas après une dose unique et dans trois quarts des cas après une administration répétée de curare. Toujours selon cette enquête, le monitorage neuromusculaire était réalisé pour la majorité des praticiens avec un monitorage instrumental quantitatif basé sur...

article

LOFAR calibration and wide-field imaging

Cyril Tasse, Ger van Diepen, Sebastiaan van der Tol, Reinout J. van Weeren, more

Comptes rendus - Physique > 2012 > 13 > 1 > 28-32

LOFAR is a revolutionary instrument, operating at low frequencies (ν≲240 MHz). It will drive major breakthroughs in the area of observational cosmology, but its use requires the development of challenging techniques and algorithms. Since its field of view and sensitivity are increased by orders of magnitude as compared to the older generation of instruments, new technical problems have to be addressed...

article

Iron Isotopic Compositions of Geological Reference Materials and Chondrites

Paul R. Craddock, Nicolas Dauphas

Geostandards and Geoanalytical Research > 35 > 1 > 101 - 123

High‐precision iron isotopic compositions for Fe‐bearing geological reference materials and chondrites with a wide range of matrices (e.g., silicates, oxides, organic‐bearing materials) are reported. This comprehensive data set should serve as a reference for iron isotopic studies across a range of geological and biological disciplines for both quality assurance and inter‐laboratory calibration. Where...

article

Reproducibility and reliability of the Pliensbachian calcareous nannofossil biohorizons from the Basque-Cantabrian Basin (Northern Spain)

Nicola Perilli, Ángela Fraguas, María José Comas-Rengifo

Geobios > 2010 > 43 > 1 > 77-85

Based on calcareous nannofossil assemblages identified in four expanded and well-dated sections from the Basque-Cantabrian Basin, the main objective of this paper is to improve the knowledge of the Pliensbachian calcareous nannofossil events, and to calibrate these events to the ammonite zones established for this area. The semiquantitative analysis of more than 140 smear slides from the Tudanca and...

article

Measuring wood density by means of X-ray computer tomography

Charline Freyburger, Fleur Longuetaud, Frédéric Mothe, Thiéry Constant, more

Annals of Forest Science > 2009 > 66 > 8 > 804-804

• Wood density is a characteristic of major interest. Usually, it is used as an indicator of wood quality; however, in the context of global change, it is increasingly used for biomass and carbon storage estimations. X-ray computer tomography is a method which enables quick estimates of wood density after applying a calibration procedure. • A review of the literature is presented in this article...

article

A calibrated patient positioning device for total hip arthroplasty

Palaniappan Lakshmanan, Shahbhaz Mohammad Yasir Ahmed, David J. Woodnutt

European Journal of Orthopaedic Surgery & Traumatology > 2008 > 18 > 2 > 173-174

Component malpositioning in total hip arthroplasty (THA) may lead to dislocation of the prosthesis. Improper positioning of the patient on the table has been noted as one of the reasons for component malpositioning. Lateral position is routinely used for posterior approach to the hip and is also commonly employed for the lateral approach to the hip. We describe the use of a calibrated patient positioning...

article

Analysis of the climate controls on the isotopic composition of precipitation (δ18O) at Nuevo Rocafuerte, 74.5°W, 0.9°S, 250 m, Ecuador

Marcos Villacís, Françoise Vimeux, Jean Denis Taupin

Comptes rendus - Geoscience > 2008 > 340 > 1 > 1-9

The interpretation of the isotopic composition of Andean ice cores (oxygen-18 and deuterium) is still in debate. In 2000, an ice core has been extracted from the Chimborazo glacier, in Ecuador, and the isotopic composition has been measured with a seasonal temporal resolution over the last century. To reliably interpret this isotopic record in terms of climate, an isotopic calibration based on modern...

article

The use of tree level vs. stand level data in forest planning calculations — does it really matter?

Marc Palahi, Timo Pukkala, Antoni Trasobares

Annals of Forest Science > 2008 > 65 > 1 > 110-110

This study examined how the type of compartment inventory data affects the outcome of forest planning calculations. The inventory data alternatives were tree level data vs. a set of stand characteristics. When stand characteristics were used the diameter distribution of trees was predicted from the stand variables. For this, prediction models for the parameters of the diameter distribution of stand...

article

New Method for Testing the Dynamic Performance of CMM Scanning Probes

A. Wozniak

IEEE Transactions on Instrumentation and Measurement > 2007 > 56 > 6 > 2767 - 2774

In this paper, a new method that applies a piezoelectric translator to test the dynamic accuracy of scanning probes for coordinate measuring machines (CMMs) is proposed. The principle of the method is presented, and this method is used for the evaluation of measurement uncertainty. The validity of the method is experimentally confirmed on a bridge Zeiss PRISMO CMM equipped with a VAST XT scanning...

article

Polarisation et calibration precise de l'energie du LEP

Jean-Pierre Koutchouk, Massimo Placidi

Comptes rendus - Physique > 2002 > 3 > 9 > 1121-1130

We report in this article on two issues of precision accelerator physics, performed at the LEP collider, that challenged international collaborations. The first result is an increase of the polarisation degree from an almost vanishing natural level to 50%, opening the way to energy calibration by resonant depolarisation. The second result is a systematic and precise determination of the collider centre-of-mass...

article

Development, construction, and validation of a thinner uniplanar calibration cage for radiostereometry

Jonathan Hugo Jürgens‐Lahnstein, Emil Toft Petersen, Mogens Laursen, Christian Hauskov Iversen, more

Journal of Orthopaedic Research® > 40 > 7 > 1645 - 1653

Radiostereometric analysis (RSA) is an accurate and precise radiographic method that can be used to measure micromotion of implants and study joint kinematics in vivo. A calibration cage with radiopaque markers is used to calibrate the RSA images; however, the thickness (250 mm) of the calibration cage restricts the available area for the patient and equipment during RSA recordings. A thinner calibration...

article

Isothermal performance of a temperature comparison source using potassium concentric annular heat pipe

Hongzhe Zhang, Fang Ye, Hang Guo, Xiaoke Yan

International Journal of Energy Research > 46 > 8 > 11041 - 11052

In the field of measurement, high‐precision thermocouples need higher precision calibration equipment. However, the metal temperature equalizing block used in traditional thermocouple calibration equipment has poor temperature uniformity, and the structure of gas‐controlled heat pipe is complex and expensive, and the concentric annular heat pipes have high isothermal performance and simple structure,...

article

Application of the modified Fourier series method and the genetic algorithm for calibration of small‐scale parameters in the nonlocal strain gradient nanobeams

Mostafa Mohammadian

Mathematical Methods in the Applied Sciences > 45 > 10 > 6325 - 6345

In recent years, nonlocal strain gradient theory (NSGT) has been widely applied by researchers for the analysis of nanostructures. In this theory, the appropriate selection of small‐scale parameters and the type of high‐order boundary conditions is of great importance. In the current paper, free vibrations of carbon nanotubes are studied using a nonlocal strain gradient Timoshenko beam model, and...

article

Assessing the calibration of subdistribution hazard models in discrete time

Moritz Berger, Matthias Schmid

Canadian Journal of Statistics > 50 > 2 > 572 - 591

The generalization performance of a risk prediction model can be evaluated by its calibration, which measures the agreement between predicted and observed outcomes on external validation data. Here, we propose methods for assessing the calibration of discrete time‐to‐event models in the presence of competing risks. Specifically, we consider the class of discrete subdistribution hazard models, which...

article

Short‐term scheduling with machine calibration

Dehua Xu, Zhijun Xu, Limin Xu, Xianyu Yu

International Transactions in Operational Research > 29 > 5 > 3031 - 3050

In most of the past research on scheduling, it is conventional to model machine deterioration by decreasing production speed over time. However, as is observed, there is a fair number of scenarios in practice where deterioration has a little impact on machine speed but a great impact on production accuracy and a machine is unusable unless it has been calibrated recently. In this paper, we consider...

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Search results

Evaluating AquaCrop model for simulating production of amaranthus (Amaranthus cruentus) a leafy vegetable, under irrigation and rainfed conditions

Design of a novel high performance Schottky barrier based compact transmission gate

Coordinating and Monitoring Quality Information for the Copernicus Services: Case Study with Optical Data Abstract\uFFFD

Enhancing the calibration of an urban growth model using a memetic algorithm

Reliable support: Measuring calibration of likelihood ratios

Surveillance du bloc neuromusculaire par accéléromyographie : concepts, applications et limites d’utilisation

LOFAR calibration and wide-field imaging

Iron Isotopic Compositions of Geological Reference Materials and Chondrites

Reproducibility and reliability of the Pliensbachian calcareous nannofossil biohorizons from the Basque-Cantabrian Basin (Northern Spain)

Measuring wood density by means of X-ray computer tomography

A calibrated patient positioning device for total hip arthroplasty

Analysis of the climate controls on the isotopic composition of precipitation (δ18O) at Nuevo Rocafuerte, 74.5°W, 0.9°S, 250 m, Ecuador

The use of tree level vs. stand level data in forest planning calculations — does it really matter?

New Method for Testing the Dynamic Performance of CMM Scanning Probes

Polarisation et calibration precise de l'energie du LEP

Development, construction, and validation of a thinner uniplanar calibration cage for radiostereometry

Isothermal performance of a temperature comparison source using potassium concentric annular heat pipe

Application of the modified Fourier series method and the genetic algorithm for calibration of small‐scale parameters in the nonlocal strain gradient nanobeams

Assessing the calibration of subdistribution hazard models in discrete time

Short‐term scheduling with machine calibration

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