PubMed Journals Articles About "Spring Valley" RSS

20:26 EST 12th December 2018 | BioPortfolio

Spring Valley PubMed articles on BioPortfolio. Our PubMed references draw on over 21 million records from the medical literature. Here you can see the latest Spring Valley articles that have been published worldwide.

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Showing "Spring Valley" PubMed Articles 1–25 of 722

Enhanced indirect-to-direct inter-valley scattering in germanium under tensile strain for improving population of electrons in direct valley.

We propose the inter-valley transferred electron model between direct Γ and indirect L valleys to gain insight into the electrons dynamics in conduction of tensile strained Ge. Inter-valley scattering is included to calculate average scattering time between Γ and L valleys based on a time-dependent Hamiltonian describing the electron-phonon interaction. Numerical results indicate that enhanced indirect-to-direct inter-valley scattering and reduced direct-to-indirect inter-valley scattering are reliable by...

Observation of an optical spring with a beam splitter.

We present the experimental observation of an optical spring without the use of an optical cavity. The optical spring is produced by interference at a beam splitter and, in principle, does not have the damping force associated with optical springs created in detuned cavities. The experiment consists of a Michelson-Sagnac interferometer (with no recycling cavities) with a partially reflective GaAs microresonator as the beam splitter that produces the optical spring. Our experimental measurements at input pow...

Spring Ligament Instability.

The crucial role of the spring ligament complex within the pathologic process that leads to flatfoot deformity has evolved recently. There has been improvement in the anatomic knowledge of the spring ligament and understanding of its complex relationship to the deltoid complex and outstanding advances in biomechanics concepts related to the spring ligament. Optimization of flatfoot treatment strategies are focused on a renewed interest in the spring ligament and medial soft tissue reconstruction in concert ...

Realization of a Valley Superlattice.

In a number of widely studied materials, such as Si, AlAs, Bi, graphene, MoS_{2}, and many transition metal dichalcogenide monolayers, electrons acquire an additional, spinlike degree of freedom at the degenerate conduction band minima, also known as "valleys." External symmetry-breaking fields such as mechanical strain, or electric or magnetic fields, can tune the valley polarization of these materials, making them suitable candidates for "valleytronics." Here we study a quantum well of AlAs, where the two...

Prevalence and risk factors of Rift Valley fever in humans and animals from Kabale district in Southwestern Uganda, 2016.

Rift Valley fever (RVF) is a zoonotic disease caused by Rift Valley fever virus (RVFV) found in Africa and the Middle East. Outbreaks can cause extensive morbidity and mortality in humans and livestock. Following the diagnosis of two acute human RVF cases in Kabale district, Uganda, we conducted a serosurvey to estimate RVFV seroprevalence in humans and livestock and to identify associated risk factors.

Culex flavivirus infection in a Culex pipiens mosquito colony and its effects on vector competence for Rift Valley fever phlebovirus.

Rift Valley fever is a mosquito-borne zoonotic disease that affects domestic ruminants and humans. Culex flavivirus is an insect-specific flavivirus that naturally exists in field mosquito populations. The influence of Culex flavivirus on Rift Valley fever phlebovirus (RVFV) vector competence of Culex pipiens has not been investigated.

Impact of Mountain-Valley Wind Circulation on Typical Cases of Air Pollution in Beijing.

The impact of mountain-valley wind circulation on the typical examples of pollution was analyzed through the selected pollution process, combining with the hourly PM concentrations and meteorological data in Haidian, Shangdianzi and Lishuiqiao in Autumn and Winter from 2013 to 2015, and also the data of Tower of atmospheric, wind profile of Haidian and automatic meteorological stations in the same period. The analysis showed that the average wind speed of valley wind was greater than that of the mountain wi...

Polarimetric microscopy for optical control and high precision measurement of valley polarization.

Two-dimensional transition metal dichalcogenides (2D TMDCs) have two degenerate energy valleys in their Brillouin zone, and these two separate valleys can be used as an information carrier in optoelectronic devices. Circularly polarized optical pumping can selectively populate a single valley, resulting in direct band transitions at the populated valley and associated circularly polarized photoluminescence (PL) emission. However, the birefringence and linear dichroism in optical microscopes can not only dis...

The uncanny valley effect in typically developing children and its absence in children with autism spectrum disorders.

Robots and virtual reality are gaining popularity in the intervention of children with autism spectrum disorder (ASD). To shed light on children's attitudes towards robots and characters in virtual reality, this study aims to examine whether children with ASD show the uncanny valley effect. We varied the realism of facial appearance by morphing a cartoon face into a human face, and induced perceptual mismatch by enlarging the eyes, which has previously been shown as an effective method to induce the uncanny...

Implant preloading in extension reduces spring length change in dynamic intraligamentary stabilization: a biomechanical study on passive kinematics of the knee.

Dynamic intraligamentary stabilization (DIS) is a primary repair technique for acute anterior cruciate ligament (ACL) tears. For internal bracing of the sutured ACL, a metal spring with 8 mm maximum length change is preloaded with 60-80 N and fixed to a high-strength polyethylene braid. The bulky tibial hardware results in bone loss and may cause local discomfort with the necessity of hardware removal. The technique has been previously investigated biomechanically; however, the amount of spring shortening...

Synthesis of Helical Analogue of Kekulene: a Flexible π-Expanded Helicene with Large Helical Diameter Acting as a Soft Molecular Spring.

A π-expanded helicene, that is the helically twisted analogue of kekulene, was synthesized using a 6-fold ring-closing olefin metathesis (RCM) reaction as a key step. The π-expanded geometry with large helical diameter ( d = 10.2 Å), consisting only of carbon and hydrogen atoms (CH), was unambiguously determined by single-crystal X-ray analysis. We found that the π-expanded helicene with large helical diameter will act as a soft molecular spring with a small spring constant. Interestingly, the mechanica...

Voices: Crossing the Valley of Death.

Overcoming the widening "Valley of Death" between stem cell laboratory discoveries and clinical translation is imperative to develop the next generation of effective therapies. We asked 9 clinical experts to share their perspectives on how to bridge this gap and increase the clinical impact of basic research.

Edge-limited valley-preserved transport in quasi-1D constriction of bilayer graphene.

We investigated the quantization of the conductance of quasi-one-dimensional (quasi-1D) constrictions in high-mobility bilayer graphene (BLG) with different geometrical aspect ratios. Ultra-short (a few tens of nm long) constrictions were fabricated by applying an under-cut etching technique. Conductance was quantized in steps of 〖~4e〗^2⁄h (~〖2e〗^2⁄h) in devices with aspect ratios smaller (larger) than 1. We argue that scattering at the edges of a quasi-1D BLG constriction limits the inter-valle...

A New Automatically Fixating Stone Basket (2.5 F) Prototype with a Nitinol Spring for Accurate Ureteroscopic Stone Size Measurement.

Intraoperative assessment of stone size is crucial for the successful and safe extraction of stones. The first automatically fixating measuring stone basket prototype showed a mismatch between the steel spring and the nitinol basket; therefore, to improve this prototype, the steel spring was replaced with a nitinol spring and a modified scale was implemented on the basket handle for accurate intraoperative stone size measurement.

The health risks of informal waste workers in the Kathmandu Valley: a cross-sectional survey.

To describe the health and occupational risks of informal waste workers (IWWs) in the Kathmandu Valley and explore the factors associated with not using personal protective equipment (PPE).

Defect-Induced Modification of Low-Lying Excitons and Valley Selectivity in Monolayer Transition Metal Dichalcogenides.

We study the effect of point-defect chalcogen vacancies on the optical properties of monolayer transition metal dichalcogenides using ab initio GW and Bethe-Salpeter equation calculations. We find that chalcogen vacancies introduce unoccupied in-gap states and occupied resonant defect states within the quasiparticle continuum of the valence band. These defect states give rise to a number of strongly bound defect excitons and hybridize with excitons of the pristine system, reducing the valley-selective circ...

Equine immunoglobulin F(ab') fragments protect mice from Rift Valley fever virus infection.

Rift Valley fever virus (RVFV) is an emerging arbovirus in Africa and the Arabian Peninsula, in which infection with RVFV poses a serious threat to humans and livestock globally. Approved treatments for RVFV infection, especially for use in humans, have not yet been developed. There is an urgent need for effective drugs to prevent RVFV disease.

Uncanny valley as a window into predictive processing in the social brain.

Uncanny valley refers to humans' negative reaction to almost-but-not-quite-human agents. Theoretical work proposes prediction violation as an explanation for uncanny valley but no empirical work has directly tested it. Here, we provide evidence that supports this theory using event-related brain potential recordings from the human scalp. Human subjects were presented images and videos of three agents as EEG was recorded: a real human, a mechanical robot, and a realistic robot in between. The real human and ...

Dynamics and Spin-Valley Locking Effects in Monolayer Transition Metal Dichalcogenides.

Transition metal dichalcogenides have been the primary materials of interest in the field of valleytronics for their potential in information storage, yet the limiting factor has been achieving long valley decoherence times. We explore the dynamics of four monolayer TMDCs (MoS, MoSe, WS, WSe) using ab initio calculations to describe electron-electron and electron-phonon interactions. By comparing calculations which both omit and include relativistic effects, we isolate the impact of spin-resolved spin-orbit...

Development of Dichelops furcatus (Hemiptera: Heteroptera: Pentatomidae) Reared on Spring Cereals Versus Soybean.

The performance and preferences of the stink bug, Dichelops furcatus (F.), for spring cereals (wheat, rye, triticale, oat, and barley) were compared in the laboratory to their preferred host crop, soybean pods. Nymphs took significantly less time to reach adulthood on soybean pods compared to those fed seed heads of the five spring cereals tested. Wheat and rye yielded the longest developmental times, while nymphs fed triticale, oat, or barley developed faster, but still not as fast as those reared on soybe...

Serological evidence of inter-epizootic/inter-epidemic circulation of Rift Valley fever virus in domestic cattle in Kyela and Morogoro, Tanzania.

Tanzania is among the Rift Valley fever (RVF) epizootic/endemic countries in sub Saharan Africa, where RVF disease outbreaks occur within a range of 3 to 17-year intervals. Detection of Rift Valley fever virus (RVFV) antibodies in animals in regions with no previous history of outbreaks raises the question of whether the disease is overlooked due to lack-of effective surveillance systems, or if there are strains of RVFV with low pathogenicity. Furthermore, which vertebrate hosts are involved in the inter-ep...

Analysis of Greenhouse Gas Emission Characteristics and Their Influencing Factors in the Algae Zone of Lake Taihu.

In order to identify CH and CO emission flux characteristics and their impact factors in the algal lake zone of Lake Taihu, CH and CO fluxes were observed by the improved closed chamber method in Meiliang Bay in Lake Taihu. The relationships between CH and CO flux and meteorological factors were analyzed. The results showed that CH and CO fluxes had obvious diurnal variations. The CH flux in the daytime was higher than that in the nighttime in spring; however, the CH flux in the nighttime was higher than th...

Enhanced surveillance for Rift Valley Fever in livestock during El Niño rains and threat of RVF outbreak, Kenya, 2015-2016.

In mid-2015, the United States' Pandemic Prediction and Forecasting Science and Technical Working Group of the National Science and Technology Council, Food and Agriculture Organization Emergency Prevention Systems, and Kenya Meteorological Department issued an alert predicting a high possibility of El-Niño rainfall and Rift Valley Fever (RVF) epidemic in Eastern Africa.

Medication development: reducing casualties in the valley of death and providing support for survivors.

Ray et al (Ray et al., 2018) discuss several obstacles encountered in the transition from pre-clinical to human clinical testing in the development of novel medications for alcohol use disorders (AUD). A large number of promising drugs have perished in this transition phase, so large that the term "valley of death" has been proposed to characterize this perilous passage (Butler, 2008). Even when the valley of death has successfully been crossed the pathway to marketing remains highly problematic. In a pap...

From Probiotic to Prebiotic Using Thermal Spring Water.

La Roche-Posay Thermal Spring Water (LRP-TSW) exhibits both probiotic and prebiotic properties enhancing the diversity of the skin microbiota.

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