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https://www.readbyqxmd.com/read/28731775/nonlinear-quantum-metrology-of-many-body-open-systems
#1
M Beau, A Del Campo
We introduce general bounds for the parameter estimation error in nonlinear quantum metrology of many-body open systems in the Markovian limit. Given a k-body Hamiltonian and p-body Lindblad operators, the estimation error of a Hamiltonian parameter using a Greenberger-Horne-Zeilinger state as a probe is shown to scale as N^{-[k-(p/2)]}, surpassing the shot-noise limit for 2k>p+1. Metrology equivalence between initial product states and maximally entangled states is established for p≥1. We further show that one can estimate the system-environment coupling parameter with precision N^{-(p/2)}, while many-body decoherence enhances the precision to N^{-k} in the noise-amplitude estimation of a fluctuating k-body Hamiltonian...
July 7, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28727614/a-5-minute-interval-between-two-dilating-eye-drops-increases-their-effect
#2
Eric Denion, Frédérique Charlot, Guillaume Béraud
PURPOSE: Patients are usually advised to wait 5 minutes between eye drops. This delay supposedly allows the first drop not to be washed out by the second one, thereby increasing the combined effect. However, in the only experimental study conducted in humans on the concurrent administration of two different eye drops, the authors concluded that a 10-minute time interval between eye drops did not increase their combined effect. Our study was designed to address this puzzling observation...
July 19, 2017: Optometry and Vision Science: Official Publication of the American Academy of Optometry
https://www.readbyqxmd.com/read/28723815/effect-of-energy-drink-consumption-on-power-and-velocity-of-selected-sport-performance-activities
#3
Bert H Jacobson, Garrett M Hester, Ty B Palmer, Kathryn Williams, Zachary K Pope, John H Sellers, Eric C Conchola, Conrad Woolsey, Carlos Estrada
Energy drinks comprise a multibillion dollar market focused on younger, active and competitive individuals. Marketing includes claims of improved alertness and performance. The purpose of this study was to assess power (W) and velocity (m·s) of a simulated, isolated forehand stroke (FHS) and a counter movement vertical jump (CVJ) before and after ingestion of a commercially available energy shot (ES) or a placebo (PL). Healthy college-aged male and female (N=36) volunteers were randomly placed in the ES or PL...
July 17, 2017: Journal of Strength and Conditioning Research
https://www.readbyqxmd.com/read/28721690/pre-or-postoperative-interscalene-block-and-or-general-anesthesia-for-arthroscopic-shoulder-surgery-a-retrospective-observational-study
#4
Laura Bosco, Cheng Zhou, John A C Murdoch, Ryan Bicknell, Wilma M Hopman, Rachel Phelan, Vidur Shyam
PURPOSE: Arthroscopic shoulder surgery can be performed with an interscalene brachial plexus block (ISBPB) alone, ISBPB combined with general anesthesia (GA), or GA alone. Postoperative pain is typically managed with opioids; however, both GA and opioids have adverse effects which can delay discharge. This retrospective study compares the efficacy of four methods of anesthesia management for arthroscopic shoulder surgery. METHODS: Charts of all patients who underwent shoulder surgery by a single surgeon from 2012-2015 were categorized by analgesic regimen: GA only (n = 177), single-shot ISBPB only (n = 124), or pre- vs postoperative ISBPB combined with GA (ISBPB + GA [n = 72] vs GA + ISBPB [n = 52], respectively)...
July 18, 2017: Canadian Journal of Anaesthesia, Journal Canadien D'anesthésie
https://www.readbyqxmd.com/read/28712103/randomised-controlled-trial-of-analgesic-effectiveness-of-three-different-techniques-of-single-shot-interscalene-brachial-plexus-block-using-20-ml-of-0-5-ropivacaine-for-shoulder-arthroscopy
#5
Michał Jan Stasiowski, Michał Kolny, Marek Zuber, Radosław Marciniak, Ewa Chabierska, Przemysław Jałowiecki, Aleksandra Pluta, Bartłomiej Możdżyński
Background Shoulder arthroscopic procedures impose a challenge to anaesthesiologists in terms of postoperative analgesia. Proper pain management after arthroscopic procedures improves patient satisfaction and facilitates early rehabilitation. METHODS: We performed a randomized, prospective clinical study to assess the influence of anthropometric parameters and IBPB technique on the quality of postoperative analgesia. A total of 106 randomly selected patients of ASA I-III status scheduled for elective shoulder arthroscopy ...
July 16, 2017: Anaesthesiology Intensive Therapy
https://www.readbyqxmd.com/read/28708962/open-label-phase-i-clinical-trial-of-ad5-ebov-in-africans-in-china
#6
Lihua Wu, Zhe Zhang, Hainv Gao, Yuhua Li, Lihua Hou, Hangping Yao, Shipo Wu, Jian Liu, Ling Wang, You Zhai, Huilin Ou, Meihua Lin, Xiaoxin Wu, Jingjing Liu, Guanjing Lang, Qian Xin, Guolan Wu, Li Luo, Pei Liu, Jianzhong Shentu, Nanping Wu, Jifang Sheng, Yunqing Qiu, Wei Chen, Lanjuan Li
BACKGROUND: To determine the safety and immunogenicity of a novel recombinant adenovirus type 5 vector based Ebola virus disease vaccine (Ad5-EBOV) in Africans in China. METHODS: A phase 1, dose-escalation, open-label trial was conducted. 61 healthy Africans were sequentially enrolled, with 31 participants receiving one shot intramuscular injection and 30 participants receiving a double-shot regimen. Primary and secondary end points related to safety and immunogenicity were assessed within 28 days after vaccination...
July 14, 2017: Human Vaccines & Immunotherapeutics
https://www.readbyqxmd.com/read/28706184/testosterone-promotes-either-dominance-or-submissiveness-in-the-ultimatum-game-depending-on-players-social-rank
#7
Yukako Inoue, Taiki Takahashi, Robert P Burriss, Sakura Arai, Toshikazu Hasegawa, Toshio Yamagishi, Toko Kiyonari
Endogenous testosterone promotes behaviours intended to enhance social dominance. However, recent research suggests that testosterone enhances strategic social behaviour rather than dominance seeking behaviour. This possibility has not been tested in a population whose members are known to vary in social status. Here, we explored the relationship between pre-existing social status and salivary testosterone level among members of a rugby team at a Japanese university, where a strong seniority norm maintains hierarchical relationships...
July 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28703331/high-resolution-diffusion-tensor-imaging-in-cervical-spondylotic-myelopathy-a-preliminary-follow-up-study
#8
Li Guan, Xiaolong Chen, Yong Hai, Xiaodong Ma, Le He, Guangzhi Wang, Chun Yuan, Hua Guo
Diffusion imaging is a promising technique as it can provide microstructural tissue information and thus potentially show viable changes in spinal cord. However, the traditional single-shot imaging method is limited as a result of various image artifacts. In order to improve measurement accuracy, we used a newly developed, multi-shot, high-resolution, diffusion tensor imaging (DTI) method to investigate diffusion metric changes and compare them with T2 -weighted (T2W) images before and after decompressive surgery for cervical spondylotic myelopathy (CSM)...
July 13, 2017: NMR in Biomedicine
https://www.readbyqxmd.com/read/28696732/studying-the-dynamics-of-relativistic-laser-plasma-interaction-on-thin-foils-by-means-of-fourier-transform-spectral-interferometry
#9
V Bagnoud, J Hornung, T Schlegel, B Zielbauer, C Brabetz, M Roth, P Hilz, M Haug, J Schreiber, F Wagner
We apply Fourier-transform spectral interferometry (FTSI) to study the interaction of intense laser pulses with ultrathin targets. Ultrathin submicrometer-thick solid CH targets were shot at the PHELIX laser facility with an intensity in the mid to upper 10^{19}  W/cm^{2} range using an innovative double-pulse structure. The transmitted pulse structure was analyzed by FTSI and shows a transition from a relativistic transparency-dominated regime for targets thinner than 500 nm to a hole-boring-dominated laser-plasma interaction for thicker targets...
June 23, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/28689221/variable-refocusing-flip-angle-single-shot-fast-spin-echo-imaging-of-liver-lesions-increased-speed-and-lesion-contrast
#10
Robert M Hicks, Andreas M Loening, Michael A Ohliger, Shreyas S Vasanawala, Thomas A Hope
PURPOSE: To evaluate acquisition time and clinical image quality of a variable refocusing flip angle (vrf) single-shot fast spin echo (SSFSE) sequence in comparison with a conventional SSFSE sequence for imaging of liver lesions in patients undergoing whole-body PET/MRI for oncologic staging. METHODS: A vrfSSFSE sequence was acquired in 43 patients with known pancreatic neuroendocrine tumors undergoing (68)Ga-DOTA-TOC PET on a simultaneous time-of-flight 3.0T PET/MRI...
July 8, 2017: Abdominal Radiology
https://www.readbyqxmd.com/read/28688442/perspective-advanced-particle-imaging
#11
David W Chandler, Paul L Houston, David H Parker
Since the first ion imaging experiment [D. W. Chandler and P. L. Houston, J. Chem. Phys. 87, 1445-1447 (1987)], demonstrating the capability of collecting an image of the photofragments from a unimolecular dissociation event and analyzing that image to obtain the three-dimensional velocity distribution of the fragments, the efficacy and breadth of application of the ion imaging technique have continued to improve and grow. With the addition of velocity mapping, ion/electron centroiding, and slice imaging techniques, the versatility and velocity resolution have been unmatched...
July 7, 2017: Journal of Chemical Physics
https://www.readbyqxmd.com/read/28683519/a-ballistics-examination-of-firearm-injuries-involving-breast-implants
#12
Christopher J Pannucci, Adam J Cyr, Neal G Moores, Jason B Young, Martin Szegedi
This ballistics study examines whether saline breast implants can decrease tissue penetration in firearm injuries. We hypothesize that the fluid column within a saline breast implant can alter bullet velocity and/or bullet pattern of mushrooming. The two experimental groups included saline implants with 7.4 cm projection and a no implant group. The experimental design allowed the bullet to pass-through an implant and into ballistics gel (n = 10) or into ballistics gel without passage through an implant (n = 11)...
July 6, 2017: Journal of Forensic Sciences
https://www.readbyqxmd.com/read/28679359/bilateral-thoracic-paravertebral-block-for-immediate-postoperative-pain-relief-in-the-pacu-a-prospective-observational-study
#13
Fei Liu, HuanKai Zhang, Yunxia Zuo
BACKGROUND: To investigate the feasibility, effectiveness and safety of bilateral thoracic paravertebral block (TPVB) in the post anesthesia care unit (PACU) for pain relief in participants after laparotomy. METHODS: A single shot of bilateral TPVB with 25 ml of 0.2% ropivacaine and 5 mg dexamethasone in combination for both sides at the 8th thoracic transverse level (T8) was performed on 201 participants who complained moderate to severe pain on arrival to PACU after laparotomy...
July 5, 2017: BMC Anesthesiology
https://www.readbyqxmd.com/read/28673676/detection-of-cholesteatoma-high-resolution-dwi-using-rs-epi-and-parallel-imaging-at-3-tesla
#14
O Algin, H Aydın, E Ozmen, G Ocakoglu, S Bercin, D A Porter, A Kutluhan
The purpose of this study is to evaluate the impact of RS-EPI-DWI in the detection of cholesteatoma and to compare with single-shot echo-planar DWI (SS-EPI-DWI). Diffusion-weighted and apparent diffusion-coefficient (ADC) images were obtained using RS-EPI and SS-EPI techniques in 30 patients. Presence of cholesteatoma (3 point scale), amount of artefacts (4 point scale), visibility (4 point scale), and ADC values of the lesions were assessed. The results of both techniques were compared with each other and gold-standard (GS) test results...
June 30, 2017: Journal of Neuroradiology. Journal de Neuroradiologie
https://www.readbyqxmd.com/read/28671304/fast-precise-and-accurate-myocardial-t1-mapping-using-a-radial-molli-sequence-with-flash-readout
#15
B Marty, B Coppa, P G Carlier
PURPOSE: Quantitative cardiac MRI, and more particularly T1 mapping, has become a most important modality to characterize myocardial tissue. In this work, the value of a radial variant of the conventional modified Look-Locker inversion recovery sequence (raMOLLI) is demonstrated. METHODS: The raMOLLI acquisition scheme consisted of five radial echo trains of 80 spokes acquired using either a fast low-angle shot (FLASH) or a true fast imaging with steady-state-precession (TrueFISP) readout at different time points after a single magnetization inversion...
July 3, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/28667957/sample-exchange-by-beam-scanning-with-applications-to-noncollinear-pump-probe-spectroscopy-at-kilohertz-repetition-rates
#16
Austin P Spencer, Robert J Hill, William K Peters, Dmitry Baranov, Byungmoon Cho, Adriana Huerta-Viga, Alexa R Carollo, Anna C Curtis, David M Jonas
In laser spectroscopy, high photon flux can perturb the sample away from thermal equilibrium, altering its spectroscopic properties. Here, we describe an optical beam scanning apparatus that minimizes repetitive sample excitation while providing shot-to-shot sample exchange for samples such as cryostats, films, and air-tight cuvettes. In this apparatus, the beam crossing point is moved within the focal plane inside the sample by scanning both tilt angles of a flat mirror. A space-filling spiral scan pattern was designed that efficiently utilizes the sample area and mirror scanning bandwidth...
June 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28655957/comparison-of-analgesic-efficacy-of-caudal-dexmedetomidine-versus-caudal-tramadol-with-ropivacaine-in-paediatric-infraumbilical-surgeries-a-prospective-randomised-double-blinded-clinical-study
#17
Savita Gupta, Rashmi Sharma
BACKGROUND AND AIMS: Caudal epidural analgesia is commonly practised regional block technique in children undergoing infraumbilical surgeries but has a short duration of action after single shot local anaesthetic injection. The aim of this study was to compare ropivacaine 0.25% with dexmedetomidine and tramadol in caudal anaesthesia in paediatric infraumbilical surgeries. METHODS: In a randomised, prospective, double-blinded study, sixty children (1-8 years) belonging to American Society of Anesthesiologists' physical status I or II scheduled for infraumbilical surgeries were included...
June 2017: Indian Journal of Anaesthesia
https://www.readbyqxmd.com/read/28653101/ct-guided-cement-sacroplasty-csp-as-pain-therapy-in-non-dislocated-insufficiency-fractures
#18
Reimer Andresen, Sebastian Radmer, Mathias Wollny, Julian Ramin Andresen, Urs Nissen, Hans-Christof Schober
INTRODUCTION: In elderly patients with reduced bone quality, insufficiency fractures of the sacrum are relatively common and are typically associated with severe disabling pain. The objective of the present study was to examine the feasibility of cement augmentation by CSP, to determine post-interventional leakages and other complications, and to present the outcome of pain over the course of 18 months. MATERIALS AND METHODS: In 23 patients (20 women and 3 men) with an average age of 81...
June 26, 2017: European Journal of Orthopaedic Surgery & Traumatology: Orthopédie Traumatologie
https://www.readbyqxmd.com/read/28652524/single-breath-hold-whole-heart-unenhanced-coronary-mra-using-multi-shot-gradient-echo-epi-at-3t-comparison-with-free-breathing-turbo-field-echo-coronary-mra-on-healthy-volunteers
#19
Yuji Iyama, Takeshi Nakaura, Yasunori Nagayama, Seitaro Oda, Daisuke Utsunomiya, Masafumi Kidoh, Hideaki Yuki, Kenichiro Hirata, Tomohiro Namimoto, Mika Kitajima, Kosuke Morita, Yoshinori Funama, Atsushi Takemura, Tomoyuki Okuaki, Yasuyuki Yamashita
PURPOSE: We investigated the feasibility of single breath hold unenhanced coronary magnetic resonance angiography (MRA) using multi-shot gradient echo planar imaging (MSG-EPI) on a 3T-scanner. METHODS: Fourteen volunteers underwent single breath hold coronary MRA with a MSG-EPI and free-breathing turbo field echo (TFE) coronary MRA at 3T. The acquisition time, signal to noise ratio (SNR), and the contrast of the sequences were compared with the paired t-test. Readers evaluated the image contrast, noise, sharpness, artifacts, and the overall image quality...
June 26, 2017: Magnetic Resonance in Medical Sciences: MRMS
https://www.readbyqxmd.com/read/28646186/magnetisation-switching-of-fept-nanoparticle-recording-medium-by-femtosecond-laser-pulses
#20
R John, M Berritta, D Hinzke, C Müller, T Santos, H Ulrichs, P Nieves, J Walowski, R Mondal, O Chubykalo-Fesenko, J McCord, P M Oppeneer, U Nowak, M Münzenberg
Manipulation of magnetisation with ultrashort laser pulses is promising for information storage device applications. The dynamics of the magnetisation response depends on the energy transfer from the photons to the spins during the initial laser excitation. A material of special interest for magnetic storage are FePt nanoparticles, for which switching of the magnetisation with optical angular momentum was demonstrated recently. The mechanism remained unclear. Here we investigate experimentally and theoretically the all-optical switching of FePt nanoparticles...
June 23, 2017: Scientific Reports
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