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https://www.readbyqxmd.com/read/28921874/polaronic-charge-carrier-lattice-interaction-in-lead-halide-perovskites
#1
Christoph Wolf, Young-Hoon Kim, Himchan Cho, Tae-Woo Lee
Almost ten years after the renaissance of the popular perovskite-type semiconductors based on lead-salts with general formula AMX3 (A=organic or inorganic cation, M=divalent metal, X=halide), many facets of photophysics continue to puzzle researchers. In this review, we shed some light on the low mobilities of charge carriers in lead-halide perovskites with special focus on the lattice properties at non-zero temperature. The polar and soft lattice leads to pronounced electron-phonon coupling, limiting carrier mobility and retarding recombination...
September 18, 2017: ChemSusChem
https://www.readbyqxmd.com/read/28914539/phonon-assisted-ultrafast-charge-transfer-at-van-der-waals-heterostructure-interface
#2
Qijing Zheng, Wissam A Saidi, Yu Xie, Zhenggang Lan, Oleg V Prezhdo, Hrvoje Petek, Jin Zhao
The van der Waals (vdW) interfaces of two-dimensional (2D) semiconductor are central to new device concepts and emerging technologies in light-electricity transduction where the efficient charge separation is a key factor. Contrary to general expectation, efficient electron-hole separation can occur in vertically stacked transition-metal dichalcogenide heterostructure bilayers through ultrafast charge transfer between the neighboring layers despite their weak vdW bonding. In this report, we show by ab initio nonadiabatic molecular dynamics calculations, that instead of direct tunneling, the ultrafast interlayer hole transfer is strongly promoted by an adiabatic mechanism through phonon excitation occurring on 20 fs, which is in good agreement with the experiment...
September 19, 2017: Nano Letters
https://www.readbyqxmd.com/read/28889903/instructed-fear-stimuli-bias-visual-attention
#3
Berre Deltomme, Gaetan Mertens, Helen Tibboel, Senne Braem
We investigated whether stimuli merely instructed to be fear-relevant can bias visual attention, even when the fear relation was never experienced before. Participants performed a dot-probe task with pictures of naturally fear-relevant (snake or spider) or -irrelevant (bird or butterfly) stimuli. Instructions indicated that two pictures (one naturally fear-relevant and one fear-irrelevant) could be followed by an electrical stimulation (i.e., instructed fear). In reality, no stimulation was administered. During the task, two pictures were presented on each side of the screen, after which participants had to determine as fast as possible on which side a black dot appeared...
September 7, 2017: Acta Psychologica
https://www.readbyqxmd.com/read/28881032/startle-reflex-modulation-during-threat-of-shock-and-threat-of-reward
#4
Margaret M Bradley, Zvinka Z Zlatar, Peter J Lang
During threat of shock, the startle reflex is potentiated, suggesting modulation by defensive mobilization. To determine whether startle potentiation is specific to aversive anticipation, startle reflexes were measured in the context of either aversive or appetitive anticipation in a between-subject study. Participants wore a device on the wrist that could deliver electrical shock (n = 49), or vibrotactile stimulation indicating monetary reward (n = 48). Cues signaling "threat" or "safe" periods were presented alone, or accompanied by presentation of affective and neutral pictures on half of the trials...
September 7, 2017: Psychophysiology
https://www.readbyqxmd.com/read/28879442/comparing-eye-trackers-by-correlating-their-eye-metric-data
#5
Johannes Titz, Agnes Scholz, Peter Sedlmeier
Up to now, the potential of eye tracking in science as well as in everyday life has not been fully realized because of the high acquisition cost of trackers. Recently, manufacturers have introduced low-cost devices, preparing the way for wider use of this underutilized technology. As soon as scientists show independently of the manufacturers that low-cost devices are accurate enough for application and research, the real advent of eye trackers will have arrived. To facilitate this development, we propose a simple approach for comparing two eye trackers by adopting a method that psychologists have been practicing in diagnostics for decades: correlating constructs to show reliability and validity...
September 6, 2017: Behavior Research Methods
https://www.readbyqxmd.com/read/28874560/ultrafast-fluorescent-decay-induced-by-metal-mediated-dipole-dipole-interaction-in-two-dimensional-molecular-aggregates
#6
Qing Hu, Dafei Jin, Jun Xiao, Sang Hoon Nam, Xiaoze Liu, Yongmin Liu, Xiang Zhang, Nicholas X Fang
Two-dimensional molecular aggregate (2DMA), a thin sheet of strongly interacting dipole molecules self-assembled at close distance on an ordered lattice, is a fascinating fluorescent material. It is distinctively different from the conventional (single or colloidal) dye molecules and quantum dots. In this paper, we verify that when a 2DMA is placed at a nanometric distance from a metallic substrate, the strong and coherent interaction between the dipoles inside the 2DMA dominates its fluorescent decay at a picosecond timescale...
September 5, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28870435/short-progressive-muscle-relaxation-or-motor-coordination-training-does-not-increase-performance-in-a-brain-computer-interface-based-on-sensorimotor-rhythms-smr
#7
L Botrel, L Acqualagna, B Blankertz, A Kübler
Brain computer interfaces (BCIs) allow for controlling devices through modulation of sensorimotor rhythms (SMR), yet a profound number of users is unable to achieve sufficient accuracy. Here, we investigated if visuo-motor coordination (VMC) training or Jacobsen's progressive muscle relaxation (PMR) prior to BCI use would increase later performance compared to a control group who performed a reading task (CG). Running the study in two different BCI-labs, we achieved a joint sample size of in N=154 naïve participants...
September 1, 2017: International Journal of Psychophysiology
https://www.readbyqxmd.com/read/28859192/measurement-of-intraocular-pressure-by-patients-with-glaucoma
#8
Savva Pronin, Lyndsay Brown, Roly Megaw, Andrew J Tatham
Importance: The ability of patients to measure their own intraocular pressure (IOP) would allow more frequent measurements and better appreciation of peak IOP and IOP fluctuation. Objective: To examine whether patients with glaucoma can perform self-tonometry using a rebound tonometer and examine patient acceptability. Design, Setting, and Participants: An observational study in which IOP was assessed using Goldmann applanation tonometry and a rebound tonometer...
August 31, 2017: JAMA Ophthalmology
https://www.readbyqxmd.com/read/28840220/microfluidic-systems-for-high-throughput-and-high-content-screening-using-the-nematode-caenorhabditis-elegans
#9
REVIEW
Matteo Cornaglia, Thomas Lehnert, Martin A M Gijs
In a typical high-throughput drug screening (HTS) process, up to millions of chemical compounds are applied to cells cultured in well plates, aiming to find molecules that exhibit a robust dose-response, as evidenced for example by a fluorescence signal. In high-content screening (HCS), one goes a step further by linking the tested compounds to phenotypic information, obtained, for instance, from microscopic cell images, thereby creating richer data sets that also require more advanced analysis methods. The nematode Caenorhabditis elegans came into the screening picture due to the wide availability of its mutants and human disease models, its relatively easy culture and short life cycle...
August 25, 2017: Lab on a Chip
https://www.readbyqxmd.com/read/28820713/quality-testing-of-artemisinin-based-antimalarial-drugs-in-myanmar
#10
Suqin Guo, Myat Phone Kyaw, Lishan He, Myo Min, Xiangxue Ning, Wei Zhang, Baomin Wang, Liwang Cui
Artemisinin-based combination therapies are the frontline treatment of Plasmodium falciparum malaria. The circulation of falsified and substandard artemisinin-based antimalarials in Southeast Asia has been a major predicament for the malaria elimination campaign. To provide an update of this situation, we purchased 153 artemisinin-containing antimalarials, as convenience samples, in private drug stores from different regions of Myanmar. The quality of these drugs in terms of their artemisinin derivative content was tested using specific dipsticks for these artemisinin derivatives, as point-of-care devices...
July 31, 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28781248/long-term-data-of-brs-presented-at-europcr-2017-friday-19-may
#11
Patrick W Serruys, Athanasios Katsikis, Yoshinobu Onuma
Bioresorbable scaffolds (BRS) were designed more than 30 years ago to overcome the disadvantages related to the permanent implantation of a metallic stent and, at present, a number of these devices have obtained a CE mark on the basis of midterm follow-up studies. However, although BRS have already been introduced into clinical practice, intensive research is ongoing worldwide to clarify their long-term safety and effectiveness. This type of research has captivated the interest of the cardiovascular community after the recent publication of long-term follow-up data from randomised trials demonstrating increased late scaffold thrombosis in the Absorb™ BRS (Abbott Vascular, Santa Clara, CA, USA)...
August 4, 2017: EuroIntervention
https://www.readbyqxmd.com/read/28748244/a-high-performance-and-low-cost-hole-transporting-layer-for-efficient-and-stable-perovskite-solar-cells
#12
Md Arafat Mahmud, Naveen Kumar Elumalai, Mushfika Baishakhi Upama, Dian Wang, Vinicius R Gonçales, Matthew Wright, Cheng Xu, Faiazul Haque, Ashraf Uddin
Here we report a small molecule oxidant 2,3,5,6-tetrafluoro-7,7,8,8-tetracyano-quinodimethane (F4TCNQ) doped, low cost 2',7'-bis(bis(4-methoxyphenyl)amino)spiro[cyclopenta[2,1-b:3,4-b']dithiophene-4,9'-fluorene] (FDT) hole transporting layer (HTL) for efficient mixed organic cation based MA0.6FA0.4PbI3 (MA = methyl ammonium, FA = formamidinium) perovskite solar cells (PSCs), fabricated via a highly reproducible controlled nucleation assisted restricted volume solvent annealing method, having full temperature compatibility with flexible substrates...
August 9, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28742060/suppressed-kondo-effect-and-kosterlitz-thouless-type-phase-transition-induced-by-level-difference-in-a-triple-dot-device
#13
Yong-Chen Xiong, Hai-Ming Huang, Wen-Lei Zhao, Amel Laref
Quantum dot system provides an ideal platform for quantum information processing, within which to demonstrate the quantum states is one of the most important issue for quantum simulation and quantum computation. In this paper, we report a peculiar electron state in a parallel triple dot device where the Ruderman-Kittel-Kasuya-Yosida interaction is invalid when the level differences of the dots sweep into appropriate regime. This extraordinary tendency then results in an antiferromagnetic spin coupling between two of the dots and may lead to zero or full conductance, relying deeply on the relation of the two level spacings...
October 11, 2017: Journal of Physics. Condensed Matter: An Institute of Physics Journal
https://www.readbyqxmd.com/read/28730066/-these-are-not-luxuries-it-is-essential-for-access-to-life-disability-related-out-of-pocket-costs-as-a-driver-of-economic-vulnerability-in-south-africa
#14
Jill Hanass-Hancock, Siphumelele Nene, Nicola Deghaye, Simmi Pillay
BACKGROUND: With the dawn of the new sustainable development goals, we face not only a world that has seen great successes in alleviating poverty but also a world that has left some groups, such as persons with disabilities, behind. Middle-income countries (MICs) are home to a growing number of persons with disabilities. As these countries strive to achieve the new goals, we have ample opportunity to include persons with disabilities in the emerging poverty alleviation strategies. However, a lack of data and research on the linkages between economic vulnerability and disability in MICs hampers our understanding of the factors increasing economic vulnerability in people with disabilities...
2017: Afr J Disabil
https://www.readbyqxmd.com/read/28727323/indocyanine-green-near-infrared-lymphangiography-for-evaluation-of-effectiveness-of-edema-fluid-flow-under-therapeutic-compression
#15
Marzanna T Zaleska, Waldemar L Olszewski
The commonly used modalities for therapy of limb lymphedema are manual lymphatic drainage, manual devices moving edema fluid and intermittent pneumatic compression (IPC). What seems to be necessary for validation of the effect of the compression procedure is imaging of the mobilized moving edema fluid. Picture of edema fluid flow would allow the therapist to use force adjusted to the tissue volume and stiffness differing in various limb regions as well as identify sites of abundant accumulation of fluid requiring more compression...
July 20, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28721740/clinical-features-and-subjective-physiological-responses-to-emotional-stimuli-in-the-presence-of-emotion-dysregulation-in-attention-deficit-hyperactivity-disorder
#16
Candan Taskiran, Serkan Karaismailoglu, Halime Tuna Cak Esen, Zeynep Tuzun, Aysen Erdem, Zeynep Dicle Balkanci, Anil Barak Dolgun, Sadriye Ebru Cengel Kultur
INTRODUCTION: Emotion dysregulation (ED) has long been recognized in clinical descriptions of attention-deficit hyperactivity disorder (ADHD), but a renewed interest in ED has advanced research on the overlap between the two entities. Autonomic reactivity (AR) is a neurobiological correlate of emotion regulation; however, the association between ADHD and AR remains unclear. Our aim was to explore the clinical differences, AR, and subjective emotional responses to visual emotional stimuli in ADHD children with and without ED...
July 19, 2017: Journal of Clinical and Experimental Neuropsychology
https://www.readbyqxmd.com/read/28714329/synthetic-sutures-clinical-evaluation-and-future-developments
#17
Roxanna E Abhari, Joana A Martins, Hayley L Morris, Pierre-Alexis Mouthuy, Andrew Carr
Today's sutures are the result of a 4000-year innovation process with regard to their materials and manufacturing techniques, yet little has been done to enhance the therapeutic value of the suture itself. In this review, we explore the historical development, regulatory database and clinical literature of sutures to gain a fuller picture of suture advances to date. First, we examine historical shifts in suture manufacturing companies and review suture regulatory databases to understand the forces driving suture development...
January 1, 2017: Journal of Biomaterials Applications
https://www.readbyqxmd.com/read/28700823/complex-three-dimensional-magnetic-ordering-in-segmented-nanowire-arrays
#18
Alexander J Grutter, Kathryn L Krycka, Elena V Tartakovskaya, Julie A Borchers, K Sai Madhukar Reddy, Eduardo Ortega, Arturo Ponce, Bethanie J H Stadler
A comprehensive three-dimensional picture of magnetic ordering in high-density arrays of segmented FeGa/Cu nanowires is experimentally realized through the application of polarized small-angle neutron scattering. The competing energetics of dipolar interactions, shape anisotropy, and Zeeman energy in concert stabilize a highly tunable spin structure that depends heavily on the applied field and sample geometry. Consequently, we observe ferromagnetic and antiferromagnetic interactions both among wires and between segments within individual wires...
August 22, 2017: ACS Nano
https://www.readbyqxmd.com/read/28699153/-hydrocephalus-due-to-hyperplasia-of-the-choroid-plexuses-in-a-patient-with-trisomy-9-mosaicism-a-real-diagnostic-and-therapeutic-challenge
#19
P Puerta-Roldan, A Guillen-Quesada, R Carrasco, J Muchart, M Serrano, E Ferrer
INTRODUCTION: Trisomy 9 is an unusual chromosome abnormality in live-born patients, which is frequently accompanied by functional and structural anomalies of the central nervous system. Among many other alterations, several studies have been published in the English-speaking literature that show an association between chromosome 9 abnormality and pathologies affecting the choroid plexuses. CASE REPORT: We report the case of a 4-month-old male with trisomy 9 mosaicism associated to hydrocephalus secondary to choroid plexus hyperplasia, who was referred due to a clinical picture of intracranial hypertension...
August 1, 2017: Revista de Neurologia
https://www.readbyqxmd.com/read/28698652/electrical-properties-of-graphene-metal-contacts
#20
Teresa Cusati, Gianluca Fiori, Amit Gahoi, Vikram Passi, Max C Lemme, Alessandro Fortunelli, Giuseppe Iannaccone
The performance of devices and systems based on two-dimensional material systems depends critically on the quality of the contacts between 2D material and metal. A low contact resistance is an imperative requirement to consider graphene as a candidate material for electronic and optoelectronic devices. Unfortunately, measurements of contact resistance in the literature do not provide a consistent picture, due to limitations of current graphene technology, and to incomplete understanding of influencing factors...
July 11, 2017: Scientific Reports
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