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https://www.readbyqxmd.com/read/29356378/understanding-fundamentals-and-reaction-mechanisms-of-electrode-materials-for-na-ion-batteries
#1
REVIEW
Linghui Yu, Luyuan Paul Wang, Hanbin Liao, Jingxian Wang, Zhenxing Feng, Ovadia Lev, Joachim S C Loo, Moulay Tahar Sougrati, Zhichuan J Xu
Development of efficient, affordable, and sustainable energy storage technologies has become an area of interest due to the worsening environmental issues and rising technological dependence on Li-ion batteries. Na-ion batteries (NIBs) have been receiving intensive research efforts during the last few years. Owing to their potentially low cost and relatively high energy density, NIBs are promising energy storage devices, especially for stationary applications. A fundamental understanding of electrode properties during electrochemical reactions is important for the development of low cost, high-energy density, and long shelf life NIBs...
January 22, 2018: Small
https://www.readbyqxmd.com/read/29355988/variation-in-practice-patterns-and-outcomes-across-united-network-for-organ-sharing-allocation-regions
#2
Dushyanth Srinivasan, Benjamin Vaccaro, Pooja Rao, Rohit Ghosh, Prashant Warier, Tariq Ahmad, Nihar Desai
BACKGROUND: The number of heart transplants performed is limited by organ availability and is managed by the United Network for Organ Sharing (UNOS). Efforts are underway to make organ disbursement more equitable as demand increases. HYPOTHESIS: Significant variation exists in contemporary patterns of care, wait times, and outcomes among patients undergoing heart transplantation across UNOS regions. METHODS: We identified adult patients undergoing first, single-organ heart transplantation between January 2006 and December 2014 in the UNOS dataset and compared sociodemographic and clinical profiles, wait times, use of mechanical circulatory support (MCS), status at time of transplantation, and 1-year survival across UNOS regions...
January 22, 2018: Clinical Cardiology
https://www.readbyqxmd.com/read/29355836/potentialities-of-silicon-nanowire-forests-for-thermoelectric-generation
#3
Elisabetta Dimaggio, Giovanni Pennelli
Silicon is a material with very good thermoelectric properties, with regard to Seebeck coefficient and electrical conductivity. Low thermal conductivities, and hence high thermal to electrical conversion efficiencies, can be achieved in nanostructures which are smaller than the phonon mean free path but large enough to preserve the electrical conductivity. We demonstrate that it is possible to fabricate a leg of a thermoelectric generator based on large collections of long nanowires, placed perpendicularly to the two faces of a silicon wafer...
January 22, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29354465/arthroscopic-assisted-pectoralis-minor-transfer-for-irreparable-tears-of-the-upper-two-thirds-of-the-subscapularis-tendon-surgical-technique
#4
Marco Cartaya, Jean-David Werthel, Philippe Valenti
Open transfer of the pectoralis minor through a deltopectoral approach has been described to treat irreparable tears of the upper two-thirds of the subscapularis. We present a less invasive arthroscopic-assisted technique for this transfer. Atraumatic dissection of the pectoralis minor and harvesting of the tendon with a bone chip from the coracoid process allow strong fixation with a double-button device on the lesser tuberosity. This arthroscopic technique allows assessment and treatment of associated intra- or extra-articular lesions and represents a promising option for the management of irreparable tears of the subscapularis...
October 2017: Arthroscopy Techniques
https://www.readbyqxmd.com/read/29353988/an-individualized-super-gaussian-single-microphone-speech-enhancement-for-hearing-aid-users-with-smartphone-as-an-assistive-device
#5
Chandan K A Reddy, Nikhil Shankar, Gautam S Bhat, Ram Charan, Issa Panahi
In this letter, we derive a new super Gaussian Joint Maximum a Posteriori (SGJMAP) based single microphone speech enhancement gain function. The developed Speech Enhancement method is implemented on a smartphone, and this arrangement functions as an assistive device to hearing aids. We introduce a "tradeoff" parameter in the derived gain function that allows the smartphone user to customize their listening preference, by controlling the amount of noise suppression and speech distortion in real-time based on their level of hearing comfort perceived in noisy real world acoustic environment...
November 2017: IEEE Signal Processing Letters
https://www.readbyqxmd.com/read/29352326/noninvasive-pulse-contour-analysis-for-determination-of-cardiac-output-in-patients-with-chronic-heart-failure
#6
Sebastian Roth, Henrik Fox, Uwe Fuchs, Uwe Schulz, Angelika Costard-Jäckle, Jan F Gummert, Dieter Horstkotte, Olaf Oldenburg, Thomas Bitter
BACKGROUND: Determination of cardiac output (CO) is essential in diagnosis and management of heart failure (HF). The gold standard to obtain CO is invasive assessment via thermodilution (TD). Noninvasive pulse contour analysis (NPCA) is supposed as a new method of CO determination. However, a validation of this method in HF is pending and performed in the present study. METHODS: Patients with chronic-stable HF and reduced left ventricular ejection fraction (LVEF ≤ 45%; HF-REF) underwent right heart catheterization including TD...
January 19, 2018: Clinical Research in Cardiology: Official Journal of the German Cardiac Society
https://www.readbyqxmd.com/read/29352057/feasibility-complications-morbidity-and-mortality-results-at-6-months-for-aneurysm-treatment-with-the-flow-re-direction-endoluminal-device-report-of-safe-study
#7
Laurent Pierot, Laurent Spelle, Jérôme Berge, Anne-Christine Januel, Denis Herbreteau, Mohamed Aggour, Michel Piotin, Alessandra Biondi, Xavier Barreau, Charbel Mounayer, Chrisanthi Papagiannaki, Jean-Paul Lejeune, Jean-Yves Gauvrit, Vincent Costalat
BACKGROUND AND PURPOSE: Flow diverters are increasingly used for the treatment of intracranial aneurysms. Evaluation of the first devices available for clinical use showed high efficacy of this treatment although safety results were worse compared with coiling or balloon-assisted coiling. The Safety and Efficacy Analysis of FRED Embolic Device in Aneurysm Treatment (SAFE) trial is a single-arm, multicenter, prospective study conducted to precisely analyze the safety and efficacy of the FRED and FRED Jr devices...
January 19, 2018: Journal of Neurointerventional Surgery
https://www.readbyqxmd.com/read/29351635/reversibility-of-severe-mitral-valve-regurgitation-after-left-ventricular-assist-device-implantation-single-centre-observations-from-a-real-life-population-of-patients
#8
Monica Dobrovie, Ricardo A Spampinato, Elena Efimova, Jaqueline G da Rocha E Silva, Julia Fischer, Michael Kuehl, Jens-Uwe Voigt, Ann Belmans, Agnieszka Ciarka, Fernanda Bonamigo Thome, Valerie Schloma, Yaroslava Dmitrieva, Sven Lehmann, Jochen Hahn, Elfriede Strotdrees, Friedrich-Wilhelm Mohr, Jens Garbade, Anna L Meyer
OBJECTIVES: This study evaluates the impact of untreated preoperative severe mitral valve regurgitation (MR) on outcomes after left ventricular assist device (LVAD) implantation. METHODS: Of the 234 patients who received LVAD therapy in our centre during a 6-year period, we selected those who had echocardiographic images of good quality and excluded those who underwent mitral valve replacement prior to or mitral valve repair during LVAD placement. The 128 patients selected were divided into 2 groups: Group A with severe MR (n = 65) and Group B with none to moderate MR (n = 63, 28 with moderate MR)...
January 16, 2018: European Journal of Cardio-thoracic Surgery
https://www.readbyqxmd.com/read/29351037/lingual-pressure-during-dingman-assisted-cleft-palate-repair-an-investigatory-case-series
#9
Rami D Sherif, Paymon Sanati-Mehrizy, Peter J Taub
BACKGROUND: A variety of palatoplasty techniques are used for cleft palate repair, almost all involving a device called the Dingman-Grabb mouth gag ("Dingman") to push the tongue and cheeks out of the way of the operating field. There have been numerous case reports of complications hypothesized to be due to the gag, such as lingual edema and airway obstruction. The purpose of this study is to introduce a technique for monitoring lingual pressure during Dingman-assisted palatoplasty and present preliminary data from a small series...
February 2018: Cleft Palate-craniofacial Journal
https://www.readbyqxmd.com/read/29350630/gaas-quantum-dots-in-a-gap-nanowire-photodetector
#10
Paul Kuyanov, Simon McNamee, Ray R LaPierre
We report the structural, optical and electrical properties of GaAs quantum dots (QDs) embedded along GaP nanowires. The GaP nanowires contained p-i-n junctions with 15 GaAs QDs within the intrinsic region. The nanowires were grown by molecular beam epitaxy using the self-assisted vapor-liquid-solid process. The crystal structure of the NW alternated between twinned ZB and WZ as the composition along the NW alternated between the GaP barriers and the GaAs QDs, respectively, leading to a polytypic structure with a periodic modulation of the NW sidewall facets...
January 19, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29350625/dynamically-tunable-interface-states-in-1d-graphene-embedded-photonic-crystal-heterostructure
#11
Zhao Huang, Shuaifeng Li, Xin Liu, Degang Zhao, Lei Ye, Xuefeng Zhu, Jianfeng Zang
Optical interface states exhibit promising applications in nonlinear photonics, low-threshold lasing, and surface-wave assisted sensing. However, the further application of interface states in configurable optics is hindered by their limited tunability. Here, we demonstrate a new approach to generate dynamically tunable and angle-resolved interface states using graphene-embedded photonic crystal (GPC) heterostructure device. By combining the GPC structure design with in situ electric doping of graphene, a continuously tunable interface state can be obtained and its tuning range is as wide as the full bandgap...
January 19, 2018: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/29350546/-we-re-like-a-gang-we-stick-together-experiences-of-ventricular-assist-device-communities
#12
Holly C Standing, Catherine Exley, Guy A MacGowan, Tim Rapley
BACKGROUND: Ventricular assist devices (VADs) are a relatively new development in the management of advanced heart failure. In the UK, VAD recipients comprise a unique group of less than 200 patients. This is the first paper to explore the experience of VAD communities, the extent to which communities are developed around the device, and how these influence the experience of living with the VAD. METHODS: Qualitative interviews were conducted with 20 VAD recipients (implanted as a bridge to transplantation), 11 interviews also included the VAD recipients' partners...
January 1, 2018: European Journal of Cardiovascular Nursing
https://www.readbyqxmd.com/read/29350305/percutaneous-mechanical-circulatory-support-devices-for-high-risk-percutaneous-coronary-intervention
#13
REVIEW
Subrata Kar
PURPOSE OF REVIEW: Percutaneous mechanical circulatory support devices (PMCSD) consist of the intra-aortic balloon pump (IABP), Impella (Abiomed Inc., Danvers, Massachusetts), Tandem Heart (Cardiac Assist, Inc., Pittsburgh, Pennsylvania), or extracorporeal membranous oxygenation (ECMO). They augment cardiac output, cardiac index, and cardiac power which allow the operator to mitigate hemodynamic perturbations during high-risk percutaneous coronary intervention (HR-PCI). This review discusses PMCSD and their contemporary literature...
January 19, 2018: Current Cardiology Reports
https://www.readbyqxmd.com/read/29350084/exploring-assistive-technology-use-to-support-cognition-in-college-students-with-histories-of-mild-traumatic-brain-injury
#14
Jessica Brown, Madeline Wollersheim
PURPOSE: College students with mild traumatic brain injury (mTBI) may experience chronic cognitive deficits necessitating use of external supports for daily task completion. The purpose of this study was to explore cognitive support system selection and use by students with histories of mTBI when completing novel prospective memory tasks. MATERIALS AND METHODS: We implemented a multiple case study, sequential explanatory mixed-methods design with three participants...
January 19, 2018: Disability and Rehabilitation. Assistive Technology
https://www.readbyqxmd.com/read/29348272/use-of-computer-technology-during-family-centered-rounds-a-qualitative-study-of-parent-perspectives
#15
Jeremy Kern, Priti Bhansali
OBJECTIVES: Physicians often use computer technologies to assist in work activities, including family-centered rounds (FCR), but little is known about the attitudes of families on the use of these technologies. We aimed to describe these perceptions on the presence and use of computer technologies during FCR. METHODS: We conducted observations of FCR from a parent's visual perspective to "see what they see." This was followed by in-depth interviews with the families of patients admitted to the hospitalist service at our institution to describe their experience with the use of computer technology by the medical team during FCR...
January 18, 2018: Hospital Pediatrics
https://www.readbyqxmd.com/read/29348023/impaired-recovery-of-left-ventricular-function-in-patients-with-cardiomyopathy-and-left%C3%A2-bundle-branch-block
#16
Edward Sze, Zainab Samad, Allison Dunning, Kristen Bova Campbell, Zak Loring, Brett D Atwater, Karen Chiswell, Joseph A Kisslo, Eric J Velazquez, James P Daubert
BACKGROUND: Patients with left bundle branch block (LBBB) often respond to cardiac resynchronization therapy (CRT) with left ventricular ejection fraction (LVEF) improvement. Guideline-directed medical therapy (GDMT), not CRT, is first-line therapy for patients with reduced LVEF with LBBB. However, there are little data on how patients with reduced LVEF and LBBB respond to GDMT. OBJECTIVES: This study examined patients with cardiomyopathy and sought to assess rates of LVEF improvement for patients with LBBB compared to other QRS morphologies...
January 23, 2018: Journal of the American College of Cardiology
https://www.readbyqxmd.com/read/29346612/hyperpyrexia-in-a-patient-with-a-left-ventricular-assist-device-a-diagnosis-beyond-the-obvious
#17
Michalis Tsamatsoulis, Chris J Kapelios, Christos Charitos
As the number of patients receiving a left ventricular assist device increases, physicians must always keep in mind that several conditions can present with non-specific symptoms, such as fever, tachypnoea and confusion. We herein report the case of a left ventricular assist device patient who developed a life-threatening condition with acute hyperthermia, confusion and extremities' clonus and muscle spasms. The patient was diagnosed with serotonin syndrome, attributed to the coadministration of 2 commonly prescribed medications (citalopram and omeprazole)...
January 15, 2018: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/29346259/do-patients-supported-with-continuous-flow-left-ventricular-assist-device-cf-lvads-have-a-sufficient-risk-of-death-to-justify-a-priority-allocation-a-propensity-score-matched-analysis-of-patients-listed-in-unos-status-2
#18
Stefano Mastrobuoni, Angelo Maria Dell'Aquila, Olivier Van Caenegem, Alain Poncelet, Luc-Marie Jacquet, Josè Garcia
BACKGROUND: Outcomes of Continuous Flow Left Ventricular Assist Devices (CF-LVADs) as bridge to transplant have significantly improved. The question has arisen whether patients on CF-LVADs have an increased risk of death on the waiting list as to justify a priority allocation (status 1). The aim of this study was to compare the survival following implantation of CF-LVADs to the survival on the waiting list for patients initially listed in United Network for Organ Sharing (UNOS) status 2...
January 18, 2018: Transplantation
https://www.readbyqxmd.com/read/29346114/or-net-a-service-oriented-architecture-for-safe-and-dynamic-medical-device-interoperability
#19
Martin Kasparick, Malte Schmitz, Björn Andersen, Max Rockstroh, Stefan Franke, Stefan Schlichting, Frank Golatowski, Dirk Timmermann
Modern surgical departments are characterized by a high degree of automation supporting complex procedures. It recently became apparent that integrated operating rooms can improve the quality of care, simplify clinical workflows, and mitigate equipment-related incidents and human errors. Particularly using computer assistance based on data from integrated surgical devices is a promising opportunity. However, the lack of manufacturer-independent interoperability often prevents the deployment of collaborative assistive systems...
January 18, 2018: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/29345632/brain-machine-interfaces-for-controlling-lower-limb-powered-robotic-systems
#20
Yongtian He, David Eguren, José M Azorín, Robert Grossman, Trieu Phat Luu, Jose Luis Pepe Contreras-Vidal
Lower-limb, powered robotics systems such as exoskeletons and orthoses have emerged as novel robotic interventions to assist or rehabilitate people with walking disabilities. These devices are generally controlled by certain physical maneuvers, for example pressing buttons or shifting body weight. Although effective, these control schemes are not what humans naturally use. The usability and clinical relevance of these robotics systems could be further enhanced by brain-machine interfaces (BMIs). A number of preliminary studies have been published on this topic, but a systematic understanding of the experimental design, tasks, and performance of BMI-exoskeleton systems for restoration of gait is lacking...
January 18, 2018: Journal of Neural Engineering
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