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https://www.readbyqxmd.com/read/28329023/hydro-wind-and-solar-power-as-a-base-for-a-100-renewable-energy-supply-for-south-and-central-america
#1
Larissa de Souza Noel Simas Barbosa, Dmitrii Bogdanov, Pasi Vainikka, Christian Breyer
Power systems for South and Central America based on 100% renewable energy (RE) in the year 2030 were calculated for the first time using an hourly resolved energy model. The region was subdivided into 15 sub-regions. Four different scenarios were considered: three according to different high voltage direct current (HVDC) transmission grid development levels (region, country, area-wide) and one integrated scenario that considers water desalination and industrial gas demand supplied by synthetic natural gas via power-to-gas (PtG)...
2017: PloS One
https://www.readbyqxmd.com/read/28328291/evaluation-of-multi-parameter-test-statistics-for-multiple-imputation
#2
Yu Liu, Craig K Enders
In Ordinary Least Square regression, researchers often are interested in knowing whether a set of parameters is different from zero. With complete data, this could be achieved using the gain in prediction test, hierarchical multiple regression, or an omnibus F test. However, in substantive research scenarios, missing data often exist. In the context of multiple imputation, one of the current state-of-art missing data strategies, there are several different analogous multi-parameter tests of the joint significance of a set of parameters, and these multi-parameter test statistics can be referenced to various distributions to make statistical inferences...
March 22, 2017: Multivariate Behavioral Research
https://www.readbyqxmd.com/read/28316122/digital-workflow-for-fixed-implant-rehabilitation-of-an-extremely-atrophic-edentulous-mandible-in-three-appointments
#3
Panos Papaspyridakos, Neha Rajput, Yukio Kudara, Hans-Peter Weber
OBJECTIVE: To present a rationale to reduce treatment complexity, number of surgeries, and overall treatment time for patients with extreme mandibular ridge deficiency. CLINICAL CONSIDERATIONS: A 67-year-old fully edentulous male presented with a chief complaint of poor retention and stability of the mandibular complete denture with consequent discomfort and inability to chew. A novel 3-appointment protocol from guided implant placement to definitive prosthesis delivery was implemented...
March 18, 2017: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/28315607/correcting-bias-due-to-missing-stage-data-in-the-non-parametric-estimation-of-stage-specific-net-survival-for-colorectal-cancer-using-multiple-imputation
#4
Milena Falcaro, James R Carpenter
BACKGROUND: Population-based net survival by tumour stage at diagnosis is a key measure in cancer surveillance. Unfortunately, data on tumour stage are often missing for a non-negligible proportion of patients and the mechanism giving rise to the missingness is usually anything but completely at random. In this setting, restricting analysis to the subset of complete records gives typically biased results. Multiple imputation is a promising practical approach to the issues raised by the missing data, but its use in conjunction with the Pohar-Perme method for estimating net survival has not been formally evaluated...
March 15, 2017: Cancer Epidemiology
https://www.readbyqxmd.com/read/28298429/speciation-network-in-laurasiatheria-retrophylogenomic-signals
#5
Liliya Doronina, Gennady Churakov, Andrej Kuritzin, Jingjing Shi, Robert Baertsch, Hiram Clawson, Juergen Schmitz
Rapid species radiation due to adaptive changes or occupation of new ecospaces challenges our understanding of ancestral speciation and the relationships of modern species. At the molecular level, rapid radiation with successive speciations over short time periods - too short to fix polymorphic alleles - is described as incomplete lineage sorting. Incomplete lineage sorting leads to random fixation of genetic markers and hence random signals of relationships in phylogenetic reconstructions. The situation is further complicated when you consider that the genome is a mosaic of ancestral and modern incompletely sorted sequence blocks that leads to reconstructed affiliations to one or the other relatives depending on the fixation of their shared ancestral polymorphic alleles...
March 15, 2017: Genome Research
https://www.readbyqxmd.com/read/28294207/selecting-the-appropriate-digital-planning-pathway-%C3%A2-for-computer-guided-implant-surgery
#6
Alejandro Lanis, Pablo Llorens, Orlando Álvarez Del Canto
The incorporation of virtual engineering into our profession and the digitalization of information are allowing us new perspectives and innovative alternatives for dental treatment modalities. The use of computer-guided implant-planning software allows the radiographic, prosthetic, surgical, and laboratory fields to be combined under a common virtual scenario, permitting complete virtual treatment planning. Different alternatives for the digital workflow have been described for computer-guided implant placement...
2017: International Journal of Computerized Dentistry
https://www.readbyqxmd.com/read/28292706/effect-of-airflow-and-material-models-on-tissue-displacement-for-surgical-planning-of-pharyngeal-airways-in-pediatric-down-syndrome-patients
#7
Dhananjay Radhakrishnan Subramaniam, Goutham Mylavarapu, Robert J Fleck, Raouf S Amin, Sally R Shott, Ephraim J Gutmark
Pharyngeal narrowing in obstructive sleep apnea (OSA) results from flow-induced displacement of soft tissue. The objective of this study is to evaluate the effect of airflow parameters and material model on soft tissue displacement for planning surgical treatment in pediatric patients with OSA and Down syndrome (DS). Anatomically accurate, three-dimensional geometries of the pharynx and supporting tissue were reconstructed for one pediatric OSA patient with DS using magnetic resonance images. Six millimeters of adenoid tissue was virtually removed based on recommendations from the surgeon, to replicate the actual adenoidectomy...
March 8, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28290127/jumping-the-gun-faster-response-latencies-to-deceptive-questions-in-a-realistic-scenario
#8
Tessa Mapala, Lara Warmelink, Sally A Linkenauger
Most theories of lie detection assume that lying increases cognitive load, resulting in longer response latencies during questioning. However, the studies supporting this theory are typically laboratory-based, in settings with no specific validity in security contexts. Consequently, using virtual reality (VR), we investigated how response latencies were influenced in an ecologically valid environment of interest to security professionals. In a highly realistic airport security terminal presented in VR, a security officer asked participants yes/no questions about their belongings...
March 13, 2017: Psychonomic Bulletin & Review
https://www.readbyqxmd.com/read/28289915/numerical-modeling-of-hemodynamics-scenarios-of-patient-specific-coronary-artery-bypass-grafts
#9
Francesco Ballarin, Elena Faggiano, Andrea Manzoni, Alfio Quarteroni, Gianluigi Rozza, Sonia Ippolito, Carlo Antona, Roberto Scrofani
A fast computational framework is devised to the study of several configurations of patient-specific coronary artery bypass grafts. This is especially useful to perform a sensitivity analysis of the hemodynamics for different flow conditions occurring in native coronary arteries and bypass grafts, the investigation of the progression of the coronary artery disease and the choice of the most appropriate surgical procedure. A complete pipeline, from the acquisition of patient-specific medical images to fast parameterized computational simulations, is proposed...
March 13, 2017: Biomechanics and Modeling in Mechanobiology
https://www.readbyqxmd.com/read/28285339/acoustic-window-planning-for-ultrasound-acquisition
#10
Rüdiger Göbl, Salvatore Virga, Julia Rackerseder, Benjamin Frisch, Nassir Navab, Christoph Hennersperger
Autonomous robotic ultrasound has recently gained considerable interest, especially for collaborative applications. Existing methods for acquisition trajectory planning are solely based on geometrical considerations, such as the pose of the transducer with respect to the patient surface. PURPOSE: This work aims at establishing acoustic window planning to enable autonomous ultrasound acquisitions of anatomies with restricted acoustic windows, such as the liver or the heart. METHODS: We propose a fully automatic approach for the planning of acquisition trajectories, which only requires information about the target region as well as existing tomographic imaging data, such as X-ray computed tomography...
March 11, 2017: International Journal of Computer Assisted Radiology and Surgery
https://www.readbyqxmd.com/read/28281931/incorporation-of-stochastic-engineering-models-as-prior-information-in-bayesian-medical-device-trials
#11
Tarek Haddad, Adam Himes, Laura Thompson, Telba Irony, Rajesh Nair
Evaluation of medical devices via clinical trial is often a necessary step in the process of bringing a new product to market. In recent years, device manufacturers are increasingly using stochastic engineering models during the product development process. These models have the capability to simulate virtual patient outcomes. This article presents a novel method based on the power prior for augmenting a clinical trial using virtual patient data. To properly inform clinical evaluation, the virtual patient model must simulate the clinical outcome of interest, incorporating patient variability, as well as the uncertainty in the engineering model and in its input parameters...
March 10, 2017: Journal of Biopharmaceutical Statistics
https://www.readbyqxmd.com/read/28275346/manipulating-bodily-presence-affects-cross-modal-spatial-attention-a-virtual-reality-based-erp-study
#12
Ville J Harjunen, Imtiaj Ahmed, Giulio Jacucci, Niklas Ravaja, Michiel M Spapé
Earlier studies have revealed cross-modal visuo-tactile interactions in endogenous spatial attention. The current research used event-related potentials (ERPs) and virtual reality (VR) to identify how the visual cues of the perceiver's body affect visuo-tactile interaction in endogenous spatial attention and at what point in time the effect takes place. A bimodal oddball task with lateralized tactile and visual stimuli was presented in two VR conditions, one with and one without visible hands, and one VR-free control with hands in view...
2017: Frontiers in Human Neuroscience
https://www.readbyqxmd.com/read/28268611/the-effect-of-time-pressure-on-stress-levels-during-virtual-wheelchair-navigation
#13
Hachem A Lamti, Philippe Gorce
In this work stress is assessed based on EEG features. We focus our efforts on the correlation between subjective ratings and cerebral indices during virtual navigation scenarios. Ten male paraplegic subjects took part in the experiment and navigated in a virtual indoor environment. They had to fulfill two missions where time pressure parameter is introduced. Subjects were equipped with Electroencephalography sensors. Temporal and frequency data were filtered and extracted. A correlation study was conducted based on principal component analysis, Fisher's tests and ANOVA...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28260232/generative-anatomy-modeling-language-gaml
#14
Doga Demirel, Alexander Yu, Seth Baer-Cooper, Tansel Halic, Coskun Bayrak
BACKGROUND: This paper presents the Generative Anatomy Modeling Language (GAML) for generating variation of 3D virtual human anatomy in real-time. This framework provides a set of operators for modification of a reference base 3D anatomy. The perturbation of the 3D models is satisfied with nonlinear geometry constraints to create an authentic human anatomy. METHODS: GAML was used to create 3D difficult anatomical scenarios for virtual simulation of airway management techniques such as Endotracheal Intubation (ETI) and Cricothyroidotomy (CCT)...
March 5, 2017: International Journal of Medical Robotics + Computer Assisted Surgery: MRCAS
https://www.readbyqxmd.com/read/28254070/computer-tool-to-evaluate-the-cue-reactivity-of-chemically-dependent-individuals
#15
Meire Luci da Silva, Annie France Frère, Henrique Jesus Quintino de Oliveira, Helio Martucci Neto, Terigi Augusto Scardovelli
BACKGROUND AND OBJECTIVE: Anxiety is one of the major influences on the dropout of relapse and treatment of substance abuse treatment. Chemically dependent individuals need (CDI) to be aware of their emotional state in situations of risk during their treatment. Many patients do not agree with the diagnosis of the therapist when considering them vulnerable to environmental stimuli related to drugs. This research presents a cue reactivity detection tool based on a device acquiring physiological signals connected to personal computer...
March 2017: Computer Methods and Programs in Biomedicine
https://www.readbyqxmd.com/read/28247305/virtual-laparoscopic-training-system-based-on-vch-model
#16
Jiangzhou Tang, Lang Xu, Longjun He, Songluan Guan, Xing Ming, Qian Liu
Laparoscopy has been widely used to perform abdominal surgeries, as it is advantageous in that the patients experience lower post-surgical trauma, shorter convalescence, and less pain as compared to traditional surgery. Laparoscopic surgeries require precision; therefore, it is imperative to train surgeons to reduce the risk of operation. Laparoscopic simulators offer a highly realistic surgical environment by using virtual reality technology, and it can improve the training efficiency of laparoscopic surgery...
April 2017: Journal of Medical Systems
https://www.readbyqxmd.com/read/28238204/combining-hydrodynamic-modelling-with-genetics-can-passive-larval-drift-shape-the-genetic-structure-of-baltic-mytilus-populations
#17
Heiko Stuckas, Loreen Knöbel, Hanna Schade, Corinna Breusing, Hans-Harald Hinrichsen, Manuela Bartel, Klaudia Langguth, Frank Melzner
While secondary contact between Mytilus edulis and M. trossulus in North America results in mosaic hybrid zone formation, both species form a hybrid swarm in the Baltic. Despite pervasive gene flow, Baltic Mytilus species maintain substantial genetic and phenotypic differentiation. Exploring mechanisms underlying the contrasting genetic composition in Baltic Mytilus species will allow insights into processes such as speciation or adaptation to extremely low salinity. Previous studies in the Baltic indicated that only weak interspecific reproductive barriers exist and discussed the putative role of adaptation to environmental conditions...
February 26, 2017: Molecular Ecology
https://www.readbyqxmd.com/read/28226790/the-effect-of-time-pressure-on-stress-levels-during-virtual-wheelchair-navigation
#18
Hachem A Lamti, Philippe Gorce, Hachem A Lamti, Philippe Gorce, Hachem A Lamti, Philippe Gorce
In this work stress is assessed based on EEG features. We focus our efforts on the correlation between subjective ratings and cerebral indices during virtual navigation scenarios. Ten male paraplegic subjects took part in the experiment and navigated in a virtual indoor environment. They had to fulfill two missions where time pressure parameter is introduced. Subjects were equipped with Electroencephalography sensors. Temporal and frequency data were filtered and extracted. A correlation study was conducted based on principal component analysis, Fisher's tests and ANOVA...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28223487/selenium-deficiency-risk-predicted-to-increase-under-future-climate-change
#19
Gerrad D Jones, Boris Droz, Peter Greve, Pia Gottschalk, Deyan Poffet, Steve P McGrath, Sonia I Seneviratne, Pete Smith, Lenny H E Winkel
Deficiencies of micronutrients, including essential trace elements, affect up to 3 billion people worldwide. The dietary availability of trace elements is determined largely by their soil concentrations. Until now, the mechanisms governing soil concentrations have been evaluated in small-scale studies, which identify soil physicochemical properties as governing variables. However, global concentrations of trace elements and the factors controlling their distributions are virtually unknown. We used 33,241 soil data points to model recent (1980-1999) global distributions of Selenium (Se), an essential trace element that is required for humans...
February 21, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28211003/an-easy-to-build-low-budget-point-of-care-ultrasound-simulator-from-linux-to-a-web-based-solution
#20
Domagoj Damjanovic, Ulrich Goebel, Benedikt Fischer, Martin Huth, Hartmut Breger, Hartmut Buerkle, Axel Schmutz
BACKGROUND: Hands-on training in point-of-care ultrasound (POC-US) should ideally comprise bedside teaching, as well as simulated clinical scenarios. High-fidelity phantoms and portable ultrasound simulation systems are commercially available, however, at considerable costs. This limits their suitability for medical schools. A Linux-based software for Emergency Department Ultrasound Simulation (edus2TM) was developed by Kulyk and Olszynski in 2011. Its feasibility for POC-US education has been well-documented, and shows good acceptance...
December 2017: Critical Ultrasound Journal
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