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https://www.readbyqxmd.com/read/28212401/preload-based-starling-like-control-of-rotary-blood-pumps-an-in-vitro-evaluation
#1
Mahdi Mansouri, Shaun D Gregory, Robert F Salamonsen, Nigel H Lovell, Michael C Stevens, Jo P Pauls, Rini Akmeliawati, Einly Lim
Due to a shortage of donor hearts, rotary left ventricular assist devices (LVADs) are used to provide mechanical circulatory support. To address the preload insensitivity of the constant speed controller (CSC) used in conventional LVADs, we developed a preload-based Starling-like controller (SLC). The SLC emulates the Starling law of the heart to maintain mean pump flow ([Formula: see text]) with respect to mean left ventricular end diastolic pressure (PLVEDm) as the feedback signal. The SLC and CSC were compared using a mock circulation loop to assess their capacity to increase cardiac output during mild exercise while avoiding ventricular suction (marked by a negative PLVEDm) and maintaining circulatory stability during blood loss and severe reductions in left ventricular contractility (LVC)...
2017: PloS One
https://www.readbyqxmd.com/read/28211697/benchmarking-density-functionals-for-chemical-bonds-of-gold
#2
Kasper Planeta Kepp
Gold plays a major role in nanochemistry, catalysis, and electrochemistry. Accordingly, hundreds of studies apply density functionals to study chemical bonding with gold, yet there is no systematic attempt to assess the accuracy of these methods applied to gold. This paper reports a benchmark against 51 experimental bond enthalpies of AuX systems and seven additional polyatomic and cationic molecules. 12 density functionals were tested, covering meta functionals, hybrids with variable HF exchange, double-hybrid, dispersion-corrected and non-hybrid GGA functionals...
February 17, 2017: Journal of Physical Chemistry. A
https://www.readbyqxmd.com/read/28211528/a-new-model-for-in-situ-nitrogen-incorporation-into-4h-sic-during-epitaxy
#3
Gabriel Ferro, Didier Chaussende
Nitrogen doping of 4H-SiC during vapor phase epitaxy is still lacking of a general model explaining the apparently contradictory trends obtained by different teams. In this paper, the evolutions of nitrogen incorporation (on both polar Si and C faces) as a function of the main growth parameters (C/Si ratio, temperature, pressure and growth rate) are reviewed and explained using a model based on surface exchanges between the gas phase and the uppermost 4H-SiC atomic layers. In this model, N incorporation is driven mainly by the transient formation of C vacancies, due to H2 etching, at the surface or near the surface...
February 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28208836/synthesis-of-graphene-based-sensors-and-application-on-detecting-sf6-decomposing-products-a-review
#4
Xiaoxing Zhang, Hao Cui, Yingang Gui
Graphene-based materials have aroused enormous focus on a wide range of engineering fields because of their unique structure. One of the most promising applications is gas adsorption and sensing. In electrical engineering, graphene-based sensors are also employed as detecting devices to estimate the operation status of gas insulated switchgear (GIS). This paper reviews the main synthesis methods of graphene, gas adsorption, and sensing mechanism of its based sensors, as well as their applications in detecting SF6 decomposing products, such as SO2, H2S, SO2F2, and SOF2, in GIS...
February 13, 2017: Sensors
https://www.readbyqxmd.com/read/28207885/the-association-between-body-mass-index-and-mortality-among-asian-peritoneal-dialysis-patients-a-meta-analysis
#5
Jing Liu, Xiaoxi Zeng, Hyokyoung G Hong, Yi Li, Ping Fu
BACKGROUND: Previous studies have revealed that increased body mass index (BMI) is associated with decreased mortality among hemodialysis patients. However, few studies have dealt with the association between BMI and mortality among patients undergoing peritoneal dialysis (PD) and even fewer studies have focused on the Asian PD patients. The reported studies were often non-conclusive and some even yielded contradictory results. This paper, to our best knowledge, registers the first attempt to systematically review the current literature and summarize new results on the association between BMI and mortality among the Asian PD population...
2017: PloS One
https://www.readbyqxmd.com/read/28205225/global-mental-health-a-call-for-increased-awareness-and-action-for-family-therapists
#6
Jo Ellen Patterson, Todd M Edwards, Susanna Vakili
Global mental health (GMH) is an emerging field that focuses on the need for culturally sensitive mental health services in low- and middle-income countries (LMICs). While many new initiatives have been established worldwide to understand GMH needs and to provide care in LMICs, family therapists have primarily worked with families in high-income countries. The few existing family-based initiatives in GMH focus on psychoeducation and are typically not based on general systems theory. However, emerging trends in family therapy may enable family therapists to impact mental health issues in LMICs...
February 15, 2017: Family Process
https://www.readbyqxmd.com/read/28202047/health-workforce-metrics-pre-and-post-2015-a-stimulus-to-public-policy-and-planning
#7
Francisco Pozo-Martin, Andrea Nove, Sofia Castro Lopes, James Campbell, James Buchan, Gilles Dussault, Teena Kunjumen, Giorgio Cometto, Amani Siyam
BACKGROUND: Evidence-based health workforce policies are essential to ensure the provision of high-quality health services and to support the attainment of universal health coverage (UHC). This paper describes the main characteristics of available health workforce data for 74 of the 75 countries identified under the 'Countdown to 2015' initiative as accounting for more than 95% of the world's maternal, newborn and child deaths. It also discusses best practices in the development of health workforce metrics post-2015...
February 15, 2017: Human Resources for Health
https://www.readbyqxmd.com/read/28198930/eugenics-in-buenos-aires-discourses-practices-and-historiography
#8
Diego Armus
Since the early 1990s, a series of studies underscored the overwhelming presence of positive eugenics in modern Argentina. These works emphasized the marginal role which discourse on eugenics took on violent methods for selection. In recent years, this point of view has shifted, emphasizing the conceptual viscosity of eugenics as well as the presence of negative eugenic discourses. This paper discusses these historiographic trends, and also dwells on the narratives that those perspectives articulated in relation to the question of sterilization and regulation of marriage of those who had tuberculosis in Buenos Aires during the first half of the twentieth century...
December 2016: História, Ciências, Saúde—Manguinhos
https://www.readbyqxmd.com/read/28197570/application-of-nanocomposite-based-sorbents-in-microextraction-techniques-a-review
#9
REVIEW
Zahra Ayazi
This paper presents a comprehensive review concerning the recent trends for the preparation of nanocomposites (NCs) and their applications in microextraction techniques. NCs are defined as organic-inorganic hybrid materials in which at least one dimension of one component is less than 100 nm. Numerous synthesis routes have been introduced to prepare NCs in recent years. This review provides a general overview regarding the present progress and new applications of NCs toward their synthesis and use in microextraction techniques, including solid-phase microextraction, stir bar sorptive extraction, and needle trap extraction, among others...
February 15, 2017: Analyst
https://www.readbyqxmd.com/read/28197066/patch-based-super-resolution-of-mr-spectroscopic-images-application-to-multiple-sclerosis
#10
Saurabh Jain, Diana M Sima, Faezeh Sanaei Nezhad, Gilbert Hangel, Wolfgang Bogner, Stephen Williams, Sabine Van Huffel, Frederik Maes, Dirk Smeets
Purpose: Magnetic resonance spectroscopic imaging (MRSI) provides complementary information to conventional magnetic resonance imaging. Acquiring high resolution MRSI is time consuming and requires complex reconstruction techniques. Methods: In this paper, a patch-based super-resolution method is presented to increase the spatial resolution of metabolite maps computed from MRSI. The proposed method uses high resolution anatomical MR images (T1-weighted and Fluid-attenuated inversion recovery) to regularize the super-resolution process...
2017: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/28187385/paleo-environmental-record-of-polycyclic-aromatic-hydrocarbons-and-polychlorobiphenyls-at-the-peripheral-site-gv7-in-victoria-land-east-antarctica
#11
Stefania Giannarelli, Alessio Ceccarini, Chiara Tiribilli, Rachele Spreafico, Sandro Francesconi, Roger Fuoco
In this paper we investigated the presence of Polycyclic Aromatic Hydrocarbons and Polychlorobiphenyls in a 50-m deep snow/firn core collected at the peripheral site GV7 in East Antarctica during the 2013-2014 XXIX Italian expedition. The concentration depth profile was obtained on the basis of the total concentration of fourteen PAHs and seven PCBs individually determined by gas chromatography triple quadrupole mass spectrometry. Both classes of pollutants showed synchronized concentration vs time profile throughout the whole period of time covered by the snow/firn core (1892-2012)...
January 27, 2017: Chemosphere
https://www.readbyqxmd.com/read/28185463/-lymphoedema-following-regional-lymph-node-surgery-for-breast-cancer
#12
P Vrtělová, O Coufal, V Fait, L Gabrielová, O Zapletal
BACKGROUND: The treatment of breast cancer is based on the multimodal principle and surgery of regional lymph nodes is an inseparable part of this. Indication criteria are changing constantly folowing advances in other modalities. It is necessary to consider not only the diagnostic or therapeutic benefit but also to take into account adverse effects. Previous studies have demonstrated that axillary dissection (ALND) is burdened by a high frequency of chronic lymphoedema of the arm or chest wall; however, a considerable percentage of patients may also suffer from lymphoedema after sentinel lymph node biopsy (SLNB)...
2017: Klinická Onkologie: Casopis Ceské a Slovenské Onkologické Spolecnosti
https://www.readbyqxmd.com/read/28185120/-one-for-sorrow-two-for-joy-american-embryo-transfer-guideline-recommendations-practices-and-outcomes-for-gestational-surrogate-patients
#13
REVIEW
Pamela M White
In January 2016, Melissa Cook, a California gestational surrogate experiencing a multiple-birth pregnancy following the in vitro fertilization (IVF) transfer of three embryos comprised of donor eggs and sperm provided by the intended father, went to the media when the intended father requested that she undergo a fetal reduction because twins were less expensive to raise than triplets. Much of the legal interest in this case to date has centered on the enforceability of surrogacy contracts. However, the Cook case also raises troubling issues about fertility treatment practices involving gestational surrogates, twin preference, and third-party reproduction medical decision-making...
February 9, 2017: Journal of Assisted Reproduction and Genetics
https://www.readbyqxmd.com/read/28179610/occupational-safety-and-health-in-construction-a-review-of-applications-and-trends
#14
Fabián Alberto Suárez Sánchez, Gloria Isabel Carvajal Peláez, Joaquín Catalá Alís
Due to the high number of accidents that occur in construction and the consequences this has for workers, organizations, society and countries, occupational safety and health (OSH) has become a very important issue for stakeholders to take care of the human resource. For this reason, and in order to know how OSH research in the construction sector has evolved over time, this article - in which articles published in English were studied - presents an analysis of research conducted from 1930 to 2016. The classification of documents was carried out following the Occupational Safety and Health Cycle which is composed of five steps: regulation, education and training, risk assessment, risk prevention, and accident analysis...
February 7, 2017: Industrial Health
https://www.readbyqxmd.com/read/28179594/nuclear-cardiology-practice-in-asia-analysis-of-radiation-exposure-and-best-practice-for-myocardial-perfusion-imaging%C3%A3-results-from-the-iaea-nuclear-cardiology-protocols-cross-sectional-study-incaps
#15
Thomas N B Pascual, Mathew Mercuri, Noura El-Haj, Henry Hee-Sung Bom, Vikram Lele, Mouaz H Al-Mallah, Osnat Luxenburg, Ganesan Karthikeyan, Joao Vitola, John J Mahmarian, Nathan Better, Leslee J Shaw, Madan M Rehani, Ravi Kashyap, Diana Paez, Maurizio Dondi, Andrew J Einstein
BACKGROUND: This paper examines the current status of radiation exposure to patients in myocardial perfusion imaging (MPI) in Asia.Methods and Results:Laboratories voluntarily provided information on MPI performed over a 1-week period. Eight best practice criteria regarding MPI were predefined by an expert panel. Implementation of ≥6 best practices (quality index [QI] ≥6) was pre-specified as a desirable goal for keeping radiation exposure at a low level. Radiation effective dose (ED) in 1,469 patients and QI of 69 laboratories in Asia were compared against data from 239 laboratories in the rest of the world (RoW)...
February 8, 2017: Circulation Journal: Official Journal of the Japanese Circulation Society
https://www.readbyqxmd.com/read/28178728/advanced-choice-employment-ace-factors-influencing-pgy-1-workplace-selection-and-future-career-intentions-of-a-cohort-of-doctors-in-waikato
#16
Helen Clark, Wayne de Beer, Veronique Gibbons
AIM: To assess whether or not a sample of PGY-1 doctors in the Waikato region remained satisfied with the ACE system for employment 12 years after its inception. METHOD: An anonymous paper-based survey was completed by a cohort (n=60) of 2015 and 2016 PGY-1 doctors based at the Waikato DHB. Questions were based around reasons for selecting the DHB, satisfaction with the ACE process and future career intentions. RESULTS: Overall satisfaction with the ACE selection process was reasonable (63%)...
January 27, 2017: New Zealand Medical Journal
https://www.readbyqxmd.com/read/28178318/estimating-decades-long-trends-in-petroleum-field-energy-return-on-investment-eroi-with-an-engineering-based-model
#17
Vinay S Tripathi, Adam R Brandt
This paper estimates changes in the energy return on investment (EROI) for five large petroleum fields over time using the Oil Production Greenhouse Gas Emissions Estimator (OPGEE). The modeled fields include Cantarell (Mexico), Forties (U.K.), Midway-Sunset (U.S.), Prudhoe Bay (U.S.), and Wilmington (U.S.). Data on field properties and production/processing parameters were obtained from a combination of government and technical literature sources. Key areas of uncertainty include details of the oil and gas surface processing schemes...
2017: PloS One
https://www.readbyqxmd.com/read/28174476/evaluation-of-research-trends-in-physical-therapy-through-analysis-of-articles-published-at-the-world-confederation-for-physical-therapy-congress
#18
REVIEW
Wan-Hee Lee, Ju-Ri Jeong, Joohee Hahn
[Purpose] The purpose of this study was to examine research trends in physical therapy through analysis of articles published at the 2015 World Confederation for Physical Therapy Congress. [Subjects and Methods] A total of 1,339 were analyzed (presentations: 346, posters: 993). The number of papers per subject area, number of oral presentations and posters, and the number of moderator nations and regional publications were analyzed by subject area. The mean and standard deviation was used for statistical analysis...
December 2016: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28173921/gunshot-wounds-resulting-in-hospitalization-in-the-united-states-2004-2013
#19
Alan Cook, Turner Osler, David Hosmer, Laurent Glance, Frederick Rogers, Brian Gross, Pamela Garcia-Filion, Ajai Malhotra
INTRODUCTION: The United States (US) leads all high income countries in gunshot wound (GSW) deaths. However, as a result of two decades of reduced federal support, study of GSW has been largely neglected. In this paper we describe the current state of GSW hospitalizations in the US using population-based data. PATIENTS AND METHODS: We conducted an observational study of patients hospitalized for GSW in the National (Nationwide) Inpatient Sample (NIS) 2004 -2013...
January 30, 2017: Injury
https://www.readbyqxmd.com/read/28168805/cesarean-myomectomy-in-modern-obstetrics-more-light-and-fewer-shadows
#20
REVIEW
Radmila Sparić, Saša Kadija, Aleksandar Stefanović, Svetlana Spremović Radjenović, Ivana Likić Ladjević, Jela Popović, Andrea Tinelli
The study aim was to evaluate management of myomas during cesarean section, the pro and cons and the outcomes of cesarean myomectomy. Moreover, we tried to investigate the long-term outcomes of cesarean myomectomy. The authors conducted a literature review using scientific databases, focusing on the benefits and outcomes of cesarean myomectomy and the recent trends regarding this topic, and identified relevant articles, related references and other papers citing them. Despite the demonstrated advantages of cesarean myomectomy, postponed myomectomy after cesarean section was recommended in some instances...
February 7, 2017: Journal of Obstetrics and Gynaecology Research
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