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https://www.readbyqxmd.com/read/27900382/ultra-fast-preparation-of-high-performance-thermoelectric-bulk-tinisb0-05sn0-95-by-microwave-synthesis
#1
Y Li, C Cheng, Y Lei, M Wang, R D Wan
The antimony-doped half-Heusler thermoelectric bulk TiNiSb0.05Sn0.95 was prepared via ultra-fast 4.5 min microwave synthesis, cold-press forming and 20 min microwave pressureless sintering. The electrical properties i.e. the Seebeck coefficient (S), electrical resistivity (ρ), and carrier concentration (n) and mobility (μ) were measured on a Seebeck coefficient/resistance analysis system (S/RAs) and Hall effect measurement system (HEMS), respectively. The thermal conductivity (κ) was measured on a laser flash thermal analyzer (LFA)...
November 30, 2016: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/27891612/neurovascular-mechanisms-underlying-augmented-cold-induced-reflex-cutaneous-vasoconstriction-in-human-hypertension
#2
Jody L Greaney, W Larry Kenney, Lacy M Alexander
Despite ample evidence of dysregulated sympathetic control of the peripheral vasculature in hypertension, no studies have examined integrated neurovascular function during cold stress in hypertensive adults (HTN). We hypothesized that (1) whole-body cooling would elicit greater cutaneous vasoconstriction and greater increases in skin sympathetic nervous system activity (SSNA) in HTN (n = 14; 56 ± 2 yrs) compared to age-matched normotensive adults (NTN; n = 14; 55 ± 2 yrs) and (2) augmented reflex vasoconstriction in HTN would be mediated by an increase in cutaneous vascular adrenergic sensitivity and a greater contribution of non-adrenergic sympathetic co-transmitters...
November 28, 2016: Journal of Physiology
https://www.readbyqxmd.com/read/27886497/large-cross-phase-modulations-at-the-few-photon-level
#3
Zi-Yu Liu, Yi-Hsin Chen, Yen-Chun Chen, Hsiang-Yu Lo, Pin-Ju Tsai, Ite A Yu, Ying-Cheng Chen, Yong-Fan Chen
We demonstrate an efficient cross-phase modulation (XPM) based on a closed-loop double-Λ system. The property of the double-Λ medium can be controlled by changing the phases of the applied optical fields. This phase-dependent XPM scheme can achieve large phase modulations at low-light intensities without requiring cavities or tightly focusing laser beams. With this scheme, we observe a π-level phase shift with two pulses, both consisting of eight photons in cold rubidium atoms. Such a novel scheme provides a simple route to generate strong interactions between photons and may have potential applications in all-optical quantum signal processing...
November 11, 2016: Physical Review Letters
https://www.readbyqxmd.com/read/27857214/laser-controlled-atom-source-for-optical-clocks
#4
Ole Kock, Wei He, Dariusz Świerad, Lyndsie Smith, Joshua Hughes, Kai Bongs, Yeshpal Singh
Precision timekeeping has been a driving force in innovation, from defining agricultural seasons to atomic clocks enabling satellite navigation, broadband communication and high-speed trading. We are on the verge of a revolution in atomic timekeeping, where optical clocks promise an over thousand-fold improvement in stability and accuracy. However, complex setups and sensitivity to thermal radiation pose limitations to progress. Here we report on an atom source for a strontium optical lattice clock which circumvents these limitations...
November 18, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27852983/ultracold-neutral-plasmas
#5
M Lyon, S L Rolston
By photoionizing samples of laser-cooled atoms with laser light tuned just above the ionization limit, plasmas can be created with electron and ion temperatures below 10 K. These ultracold neutral plasmas have extended the temperature bounds of plasma physics by two orders of magnitude. Table-top experiments, using many of the tools from atomic physics, allow for the study of plasma phenomena in this new regime with independent control over the density and temperature of the plasma through the excitation process...
November 17, 2016: Reports on Progress in Physics
https://www.readbyqxmd.com/read/27846495/realization-of-two-dimensional-spin-orbit-coupling-for-bose-einstein-condensates
#6
Zhan Wu, Long Zhang, Wei Sun, Xiao-Tian Xu, Bao-Zong Wang, Si-Cong Ji, Youjin Deng, Shuai Chen, Xiong-Jun Liu, Jian-Wei Pan
Cold atoms with laser-induced spin-orbit (SO) interactions provide a platform to explore quantum physics beyond natural conditions of solids. Here we propose and experimentally realize two-dimensional (2D) SO coupling and topological bands for a rubidium-87 degenerate gas through an optical Raman lattice, without phase-locking or fine-tuning of optical potentials. A controllable crossover between 2D and 1D SO couplings is studied, and the SO effects and nontrivial band topology are observed by measuring the atomic cloud distribution and spin texture in momentum space...
October 7, 2016: Science
https://www.readbyqxmd.com/read/27830673/hemangioma-of-the-oral-and-perioral-region-nd-yag-vs-surgery
#7
Domenico Parisi, Francesco Ciancio, Luigi Cagiano, Monica Rucci, Luigi Annacontini, Aurelio Portincasa
INTRODUCTION: Hemangiomas are very commonly diagnosticated in childhood. The area most affected by this disease is the head and neck. In recent decades, the laser therapy has changed the treatment of hemangiomas through special techniques with advantages in bleeding risk management. MATERIALS AND METHODS: Object of this study is comparing Nd:YAG laser and surgical excision, in terms of aesthetic outcomes, in the treatment of hemangiomas of oral and perioral region...
October 14, 2016: Annali Italiani di Chirurgia
https://www.readbyqxmd.com/read/27824756/adverse-pregnancy-outcomes-after-treatment-for-cervical-intraepithelial-neoplasia
#8
Tone Bjørge, Gry B Skare, Line Bjørge, Ameli Tropé, Stefan Lönnberg
OBJECTIVE: To explore associations between specific treatments for intraepithelial or early invasive cervical lesions and adverse pregnancy outcomes. METHODS: We conducted a population-based cohort study in which treatment data from the Cancer Registry of Norway were linked to the Medical Birth Registry of Norway to identify adverse pregnancy outcomes. All women (n=545,243) with singleton births (N=943,321) in Norway during 1998-2014 were included; 9,554 of births were in women treated before delivery...
December 2016: Obstetrics and Gynecology
https://www.readbyqxmd.com/read/27797452/refrigerated-platelets-stored-in-whole-blood-up-to-5-days-adhere-to-thrombi-formed-during-hemorrhagic-hypotension-in-rats
#9
Ivo P Torres Filho, Luciana N Torres, Celina Valdez, Christi Salgado, Andrew P Cap, Michael A Dubick
There is renewed interest in the therapeutic use of cold-stored platelets for bleeding patients. However, critical information is absent or partially available in vitro. Therefore, thrombus formation and platelet adhesion were studied in vivo, in situ, using bleeding and thrombosis models in instrumented rats, and confocal intravital videomicroscopy OBJECTIVES: We tested the hypothesis that refrigerated (4°C) platelets (stored for 24 hours or 5 days) participated in thrombus formation as well as platelets stored at room temperature (RT, 22°C)...
October 31, 2016: Journal of Thrombosis and Haemostasis: JTH
https://www.readbyqxmd.com/read/27790296/holmium-laser-vs-conventional-cold-knife-direct-visual-internal-urethrotomy-for-short-segment-bulbar-urethral-stricture-outcome-analysis
#10
Ankur Jhanwar, Manoj Kumar, Satya Narayan Sankhwar, Gaurav Prakash
INTRODUCTION: Our goal was to analyze the outcome between holmium laser and cold knife direct visual internal urethrotomy (DVIU) for short-segment bulbar urethral stricture. METHODS: We conducted a prospective study comprised of 112 male patients seen from June 2013 to December 2014. Inclusion criterion was short-segment bulbar urethral stricture (≤1.5cm). Exclusion criteria were prior intervention/urethroplasty, pan-anterior urethral strictures, posterior stenosis, urinary tract infection, and those who lost to followup...
May 2016: Canadian Urological Association Journal, Journal de L'Association des Urologues du Canada
https://www.readbyqxmd.com/read/27776990/functional-characterization-of-at-level-hypersensitivity-in-patients-with-spinal-cord-injury
#11
Carola Vogel, Roman Rukwied, Lenka Stockinger, Marcus Schley, Martin Schmelz, Wolfgang Schleinzer, Christoph Konrad
: At-level and above-level hypersensitivity was assessed in patients with chronic complete thoracic spinal cord injury (SCI). Patients were classified by somatosensory mapping (brush, cold, pinprick) and assigned into two groups, i.e. patients i) with at-level hypersensitivity (SCIHs, n=8) and ii) without at-level hypersensitivity (SCINHs, n=7). Gender and age-matched healthy subjects served as controls. Quantitative sensory testing (QST), electrically- and histamine-induced pain and itch, laser Doppler imaging and laser-evoked potentials (LEP) were recorded at-level and above-level in SCI-patients...
October 21, 2016: Journal of Pain: Official Journal of the American Pain Society
https://www.readbyqxmd.com/read/27761102/proteome-profiling-reveals-insights-into-cold-tolerant-growth-in-sea-buckthorn
#12
Caiyun He, Guori Gao, Jianguo Zhang, Aiguo Duan, Hongmei Luo
BACKGROUND: Low temperature is one of the crucial environmental factors limiting the productivity and distribution of plants. Sea buckthorn (Hippophae rhamnoides L.), a well recognized multipurpose plant species, live successfully in in cold desert regions. But their molecular mechanisms underlying cold tolerance are not well understood. METHODS: Physiological and biochemical responses to low-temperature stress were studied in seedlings of sea buckthorn. Differentially expressed protein spots were analyzed using multiplexing fluorescent two-dimensional fluorescence difference gel electrophoresis (2D-DIGE) coupled with matrix-assisted laser desorption/ionization (MALDI) time-of-flight/time-of-flight (TOF/TOF) mass spectrometry (MS), the concentration of phytohormone was measured using enzyme-linked immunosorbent assay, and a spectrophotometric assay was used to measure enzymatic reactions...
2016: Proteome Science
https://www.readbyqxmd.com/read/27751953/photobiomodulation-of-human-adipose-derived-stem-cells-using-810nm-and-980nm-lasers-operates-via-different-mechanisms-of-action
#13
Yuguang Wang, Ying-Ying Huang, Yong Wang, Peijun Lyu, Michael R Hamblin
Photobiomodulation (PBM) using red or near-infrared (NIR) light has been used to stimulate the proliferation and differentiation of adipose-derived stem cells. The use of NIR wavelengths such as 810nm is reasonably well accepted to stimulate mitochondrial activity and ATP production via absorption of photons by cytochrome c oxidase. However, the mechanism of action of 980nm is less well understood. Here we study the effects of both wavelengths (810nm and 980nm) on adipose-derived stem cells in vitro. Both wavelengths showed a biphasic dose response, but 810nm had a peak dose response at 3J/cm(2) for stimulation of proliferation at 24h, while the peak dose for 980nm was 10-100 times lower at 0...
October 15, 2016: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/27712461/oral-health-related-quality-of-life-before-and-after-treatment-of-dentin-hypersensitivity-with-cyanoacrylate-and-laser
#14
Thiago César Lima, Natália Maria Vieira-Barbosa, Camila Grasielli de Sá Azevedo, Fabiana Rodrigues de Matos, Dhelfeson Willya Douglas de Oliveira, Evandro Silveira de Oliveira, Maria Letícia Ramos-Jorge, Patricia Furtado Gonçalves, Olga Dumont Flecha
BACKGROUND: The aim of this longitudinal study was to verify changes in patients' oral health related quality of life 180 days after the treatment of dentin hypersensitivity with laser and cyanoacrylate. METHODS: This clinical, controlled, randomized, double-blind trial used a split-mouth design, and quadrants were randomized to receive either laser or cyanoacrylate treatments. All patients received both treatments. The study included 62 patients from 12-60 years of age (mean: 31...
October 7, 2016: Journal of Periodontology
https://www.readbyqxmd.com/read/27677457/coherent-and-dynamic-beam-splitting-based-on-light-storage-in-cold-atoms
#15
Kwang-Kyoon Park, Tian-Ming Zhao, Jong-Chan Lee, Young-Tak Chough, Yoon-Ho Kim
We demonstrate a coherent and dynamic beam splitter based on light storage in cold atoms. An input weak laser pulse is first stored in a cold atom ensemble via electromagnetically-induced transparency (EIT). A set of counter-propagating control fields, applied at a later time, retrieves the stored pulse into two output spatial modes. The high visibility interference between the two output pulses clearly demonstrates that the beam splitting process is coherent. Furthermore, by manipulating the control lasers, it is possible to dynamically control the storage time, the power splitting ratio, the relative phase, and the optical frequencies of the output pulses...
September 28, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27669726/factors-associated-with-postobturation-pain-following-single-visit-nonsurgical-root-canal-treatment-%C3%A2-a-systematic-review
#16
Venkateshbabu Nagendrababu, James L Gutmann
OBJECTIVE: Reducing the pain after root canal therapy is a key aspect in endodontic practice. The present systematic review aimed to identify the factors that influence postobturation pain (POP) in patients receiving single-visit nonsurgical root canal treatment. DATA SOURCES: A literature search was performed manually and in Pubmed (Medline) database to identify relevant articles. A data extraction form was constructed and data were collected from the identified articles...
September 26, 2016: Quintessence International
https://www.readbyqxmd.com/read/27667262/controllably-releasing-long-lived-quantum-memory-for-photonic-polarization-qubit-into-multiple-spatially-separate-photonic-channels
#17
Lirong Chen, Zhongxiao Xu, Weiqing Zeng, Yafei Wen, Shujing Li, Hai Wang
We report an experiment in which long-lived quantum memories for photonic polarization qubits (PPQs) are controllably released into any one of multiple spatially-separate channels. The PPQs are implemented with an arbitrarily-polarized coherent signal light pulses at the single-photon level and are stored in cold atoms by means of electromagnetic-induced-transparency scheme. Reading laser pulses propagating along the direction at a small angle relative to quantum axis are applied to release the stored PPQs into an output channel...
September 26, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27627290/heavy-tailed-phase-space-distributions-beyond-boltzmann-gibbs-confined-laser-cooled-atoms-in-a-nonthermal-state
#18
Andreas Dechant, Shalom Tzvi Shafier, David A Kessler, Eli Barkai
The Boltzmann-Gibbs density, a central result of equilibrium statistical mechanics, relates the energy of a system in contact with a thermal bath to its equilibrium statistics. This relation is lost for nonthermal systems such as cold atoms in optical lattices, where the heat bath is replaced with the laser beams of the lattice. We investigate in detail the stationary phase-space probability for Sisyphus cooling under harmonic confinement. In particular, we elucidate whether the total energy of the system still describes its stationary state statistics...
August 2016: Physical Review. E
https://www.readbyqxmd.com/read/27613370/laser-acupuncture-attenuates-oxaliplatin-induced-peripheral-neuropathy-in-patients-with-gastrointestinal-cancer-a-pilot-prospective-cohort-study
#19
Yueh-Ling Hsieh, Li-Wei Chou, Shao-Fu Hong, Fei-Chi Chang, Szu-Wen Tseng, Chi-Chou Huang, Ching-Hsiang Yang, Chen-Chia Yang, Wei-Feng Chiu
BACKGROUND: Oxaliplatin is a platinum compound that is widely used in the treatment of some solid tumours. Oxaliplatin-induced peripheral neuropathy (OIPN) in the upper and lower extremities is the major adverse side effect and represents the main dose-limiting factor of this drug. The aim of this single-arm study was to evaluate the feasibility and effects of laser acupuncture (LA) in the treatment of OIPN in patients with advanced gastrointestinal cancers. METHODS: 17 gastrointestinal cancer survivors (14 colorectal and 3 gastric cancers), who had been treated with oxaliplatin-based chemotherapies, were recruited...
October 2016: Acupuncture in Medicine: Journal of the British Medical Acupuncture Society
https://www.readbyqxmd.com/read/27607654/picosecond-laser-induced-water-condensation-in-a-cloud-chamber
#20
Haiyi Sun, Yonghong Liu, Jingjing Ju, Ye Tian, Yafeng Bai, Yaoxiang Liu, Shengzhe Du, Cheng Wang, Tiejun Wang, Jiansheng Liu, See Leang Chin, Ruxin Li, Zhizhan Xu
We investigated water condensation in a laboratory cloud chamber induced by picosecond (ps) laser pulses at ~350 ps (800 nm/1-1000 Hz) with a maximum peak power of ~25 MW. The peak power was much lower than the critical power for self-focusing in air (~3-10 GW depending on the pulse duration). Sparks, airflow and snow formation were observed under different laser energies or repetition rates. It was found that weaker ps laser pulses can also induce water condensation by exploding and breaking down ice crystals and/or water droplets into tiny particles although there was no formation of laser filament...
September 5, 2016: Optics Express
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