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RF pattern

Li-Chi Kao, Bo-Jia Huang, Yu-En Jeng, Kai-Teng Tu, Shang-Jui Chiu, Ching-Shun Ku, Kuang-Yao Lo
Zn dots are potential solutions for metal contacts in future nanodevices. The metastable states that exist at the interface between Zn quantum dots and oxide-free Si(111) surfaces can suppress the development of the complete relaxation and increase the size of Zn dots. In this work, the actual heat consumption of the structural evolution of Zn dots resulting from extrinsic thermal effect was analyzed. Zn dots were coherently grown on oxide-free Si(111) through magnetron RF sputtering. A compensative optical method combined with reflective second harmonic generation (RSHG) and synchrotron X-ray diffraction (XRD) was developed to statistically analyze the thermal effect on the Zn dot system...
November 14, 2017: Nanotechnology
Manushka V Vaidya, Cem M Deniz, Christopher M Collins, Daniel K Sodickson, Riccardo Lattanzi
OBJECTIVE: To use high-permittivity materials (HPM) positioned near radiofrequency (RF) surface coils to manipulate transmit/receive field patterns. MATERIALS AND METHODS: A large HPM pad was placed below the RF coil to extend the field of view (FOV). The resulting signal-to-noise ratio (SNR) was compared with that of other coil configurations covering the same FOV in simulations and experiments at 7 T. Transmit/receive efficiency was evaluated when HPM discs with or without a partial shield were positioned at a distance from the coil...
November 6, 2017: Magma
Nour Malek, Stefan Treue, Paul Khayat, Julio Martinez-Trujillo
Single cell studies in macaques have shown that attending to one of two stimuli, positioned inside a visual neuron's receptive field (RF), modulates the neuron's response to reflect the features of the attended stimulus. Such a modulation has been described as a "push-pull" effect relative to a reference response: neuronal response increases when attention is directed to a preferred stimulus, and decreases when attention is directed to a non-preferred stimulus. It has been further suggested that the response increase when attending to a preferred stimulus is the predominant effect...
November 2, 2017: European Journal of Neuroscience
Stewart Trost, Dylan Cliff, Matthew Ahmadi, Nguyen Van Tuc, Markus Hagenbuchner
PURPOSE: Pattern recognition approaches to accelerometer data processing have emerged as viable alternatives to cut-point methods. However, few studies have explored the validity of pattern recognition approaches in pre-schoolers; and none have compared supervised learning algorithms trained on hip and wrist data. To develop, test, and compare activity class recognition algorithms trained on hip, wrist, and combined hip and wrist accelerometer data in pre-schoolers. METHODS: 11 children aged 3 - 6 y (mean age 4...
October 20, 2017: Medicine and Science in Sports and Exercise
Boubker Zaaimi, Lauren R Dean, Stuart N Baker
Coordinated movement requires patterned activation of muscles. In this study we examined differences in selective activation of primate upper limb muscles by cortical and sub-cortical regions. Five macaque monkeys were trained to perform a reach and grasp task, and electromyogram (EMG) was recorded from 10-24 muscles while weak single-pulse stimuli were delivered through microelectrodes inserted in the motor cortex (M1), reticular formation (RF) or cervical spinal cord (SC). Stimulus intensity was adjusted to a level just above threshold...
October 18, 2017: Journal of Neurophysiology
Pooja Viswanathan, Andreas Nieder
The concept of receptive field (RF) describes the responsiveness of neurons to sensory space. Neurons in the primate association cortices have long been known to be spatially selective but a detailed characterization and direct comparison of RFs between frontal and parietal association cortices is missing. We sampled the RFs of a large number of neurons from two interconnected areas of the frontal and parietal lobes, the dorsolateral prefrontal cortex (dlPFC) and ventral intraparietal area (VIP), of rhesus monkeys by systematically presenting a moving bar during passive fixation...
October 17, 2017: European Journal of Neuroscience
Annalisa De Silvestri, Cristina Capittini, Dimitri Poddighe, Gian Luigi Marseglia, Luca Mascaretti, Elena Bevilacqua, Annamaria Pasi, Miryam Martinetti, Carmine Tinelli
Juvenile Idiopathic Arthritis (JIA) is characterized with a variable pattern of articular involvement and systemic symptoms and, thus, it has been classified in several subtypes. Genetic predisposition to JIA is mainly due to HLA class II molecules (HLA-DRB1, HLA-DPB1), although HLA class I molecules and non-HLA genes have been implicated, too. Here, we carried out a meta-analysis on selected studies designed to assess HLA genetic background of JIA patients, compared to healthy controls and, particularly, we focused our attention on HLA-DRB1...
October 13, 2017: Autoimmunity Reviews
Brenda V Canizo, Leticia B Escudero, María B Pérez, Roberto G Pellerano, Rodolfo G Wuilloud
The feasibility of the application of chemometric techniques associated with multi-element analysis for the classification of grape seeds according to their provenance vineyard soil was investigated. Grape seed samples from different localities of Mendoza province (Argentina) were evaluated. Inductively coupled plasma mass spectrometry (ICP-MS) was used for the determination of twenty-nine elements (Ag, As, Ce, Co, Cs, Cu, Eu, Fe, Ga, Gd, La, Lu, Mn, Mo, Nb, Nd, Ni, Pr, Rb, Sm, Te, Ti, Tl, Tm, U, V, Y, Zn and Zr)...
March 1, 2018: Food Chemistry
Lois Lamerato, Kylie Matthews, Kwanza Price, Alan Szymialis, Michael Eaddy, Augustina Ogbonnaya, Huai-Che Shih, Harris Ahmad
BACKGROUND: Anti-cyclic citrullinated peptide (CCP) antibody positivity is an established diagnostic factor for severe disease activity and joint damage and a prognostic factor for aggressive disease in rheumatoid arthritis (RA). OBJECTIVE: To compare RA-related treatment, healthcare utilization, and joint erosion between anti-CCP-positive and anti-CCP-negative RA patients. METHODS: Newly diagnosed RA patients were identified from the Henry Ford Health System database between 1/1/2009 and 12/31/2014; the date of the first RA diagnosis within the study period was the index date...
October 13, 2017: Journal of Medical Economics
Gad Cotter, Beth A Davison, Javed Butler, Sean P Collins, Justin A Ezekowitz, G Michael Felker, Gerasimos Filippatos, Phillip D Levy, Marco Metra, Piotr Ponikowski, John R Teerlink, Adriaan A Voors, Stefanie Senger, David Bharucha, Kathleen Goin, David G Soergel, Peter S Pang
INTRODUCTION: TRV027, a 'biased' ligand of the angiotensin II type 1 receptor (AT1R), did not affect a composite clinical outcome at 30 days in a phase 2b acute heart failure (AHF) trial (BLAST-AHF). METHODS: Post-hoc analyses from BLAST-AHF (n = 618) examined the effects of TRV027 by baseline systolic blood pressure (SBP) on changes in renal function and 180-day outcomes. Interactions between baseline SBP and select endpoints were identified utilizing a subpopulation treatment effect pattern plots (STEPP) analysis, then grouping of patients by SBP tertile: < 127, ≥ 127 to < 140, and ≥ 140 mmHg...
October 6, 2017: Clinical Research in Cardiology: Official Journal of the German Cardiac Society
Z Shaw, W Feilner, B Esser, J C Dickens, A A Neuber
A software controllable system which generates and transmits user defined RF signals is discussed. The system is implemented with multiple, modular transmitting channels that allow the user to easily replace parts such as amplifiers or antennas. Each channel is comprised of a data pattern generator (DPG), a digital to analog converter (DAC), a power amplifier, and a transmitting antenna. All channels are controlled through a host PC and synchronized through a master clock signal provided to each DAC by an external clock source...
September 2017: Review of Scientific Instruments
Shuya Dong, Jiao He, Huiping Hou, Yaping Shuai, Qi Wang, Wenling Yang, Zheng Sun, Qing Li, Kaishun Bi, Ran Liu
A novel, improved and comprehensive method for quality evaluation and discrimination of Herba Leonuri has been developed and validated based on normal- and reversed-phase chromatographic methods. To identify Herba Leonuri, normal- and reversed-phase high-performance thin-layer chromatography fingerprints were obtained by comparing the colors and Rf values of the bands, and reversed-phase HPLC fingerprints were obtained by using an Agilent Poroshell 120 SB-C18 within 28 min. By similarity analysis and hierarchical clustering analysis, we show that there are similar chromatographic patterns in Herba Leonuri samples, but significant differences in counterfeits and variants...
September 27, 2017: Journal of Separation Science
David P E Crabtree, Brandon J Herrera, Sanghoon Kang
Cell phones and electronic appliances and devices are inseparable from most people in modern society and the electromagnetic field (EMF) from the devices is a potential health threat. Although the direct health effect of a cell phone and its radiofrequency (RF) EMF to human is still elusive, the effect to unicellular organisms is rather apparent. Human microbiota, including skin microbiota, has been linked to a very significant role in the health of a host human body. It is important to understand the response of human skin microbiota to the RF-EMF from cell phones and personal electronic devices, since this may be one of the potential mechanisms of a human health threat brought about by the disruption of the intimate and balanced host-microbiota relationship...
October 2017: Journal of Microbiology / the Microbiological Society of Korea
Lin Chen, Yourhui Wang, Yuqing Cheng, Mingzhan Du, Jiong Shi, Xianghan Fan, Xiaoli Zhou, Yifeng Zhang, Lingchan Guo, Guifang Xu, Yamin He, Dan Zhou, Xiaoping Zou, Qin Huang
OBJECTIVE: To investigate risk factors (RF) of lymph node metastasis (LNM) in early gastric carcinoma (EGC) in 4 tertiary medical centers in Jiangsu Province. METHODS: Among 10097 consecutive combined gastric cancer radical resections, 1903 EGCs were identified and reviewed, 283 excluded, and 1620 included for the study. All pathologic and some endoscopic reports were studied for demographic, tumor location, gross feature, the number of lymph nodes retrieved and involved...
September 26, 2017: Journal of Digestive Diseases
Karen Junius, Nina Lefeber, Eva Swinnen, Bram Vanderborght, Dirk Lefeber
OBJECTIVE: Show the benefit of kinematically compatible joint structures in exoskeletons for improving their performance in reducing metabolic consumption. METHODS: Subjects were fitted with a hip exoskeleton, with misalignment compensation for all DOFs and were instructed to perform recurring sit-to-stand motions for 5 minutes. This was executed 3 times: unequipped (i.e. not wearing the exoskeleton), assisted and unassisted. During each trial, oxygen consumption and muscle activity were monitored...
September 20, 2017: IEEE Transactions on Bio-medical Engineering
Jorge López-Fernández, Jorge García-Unanue, Javier Sánchez-Sánchez, Manuel León, Enrique Hernando, Leonor Gallardo
BACKGROUND: Latest studies suggest similar performance of soccer players either on artificial turf (AT) or natural grass (NG). However, it is not clear if their muscular and physiological responses are also similar on both surfaces. This research aims to assess the influence of game surface on physiological patterns and neuromuscular responses of soccer players during a soccer simulation protocol (SSP) that incorporates repeated sprints and nonlinear actions at maximum speed. METHODS: Sixteen amateur soccer players completed three bouts of the SSP on both AT and NG...
September 22, 2017: Journal of Sports Medicine and Physical Fitness
Bin Cai, Harold Li, Deshan Yang, Vivian Rodriguez, Austen Curcuru, Yuhe Wang, Jie Wen, Rojano Kashani, Sasa Mutic, Olga Green
PURPOSE: The purpose of this study was to investigate and characterize the performance of a Multi Leaf Collimator (MLC) designed for Cobalt-60 based MR-guided radiation therapy system in a 0.35 T magnetic field. METHODS: The MLC design and unique assembly features in the ViewRay MRIdian system were first reviewed. The RF cage shielding of MLC motor and cables were evaluated using ACR phantoms with real-time imaging and quantified by signal-to-noise ratio. The dosimetric characterizations, including the leaf transmission, leaf penumbra, tongue-and-groove effect, were investigated using radiosensitive films...
September 9, 2017: Medical Physics
Kenji Masumoto, Michael T Soucy, Joshua P Bailey, John A Mercer
We investigated muscle activity during backward (BR) and forward (FR) running with body weight support (BWS). Ten participants completed BR and FR on a lower body positive pressure treadmill while selecting a preferred speed (PS) for different BWS conditions (0%, 20%, 40%, 60%, and 80%BWS). Muscle activity from the rectus femoris (RF), biceps femoris (BF), tibialis anterior (TA), and gastrocnemius (GA), rating of perceived exertion (RPE), preferred stride frequency (PSF), and PS were measured. Magnitude of muscle activity (BF, TA, and GA), RPE, PSF, and PS were not influenced by the interaction of direction and BWS (P>0...
September 5, 2017: Human Movement Science
Shahzad Ali, Yueyue Xu, Xiangcheng Ma, Irshad Ahmad, Muhammad Kamran, Zhaoyun Dong, Tie Cai, Qianmin Jia, Xiaolong Ren, Peng Zhang, Zhikuan Jia
The ridge furrow (RF) rainwater harvesting system is an efficient way to enhance rainwater accessibility for crops and increase winter wheat productivity in semi-arid regions. However, the RF system has not been promoted widely in the semi-arid regions, which primarily exist in remote hilly areas. To exploit its efficiency on a large-scale, the RF system needs to be tested at different amounts of simulated precipitation combined with deficit irrigation. Therefore, in during the 2015-16 and 2016-17 winter wheat growing seasons, we examined the effects of two planting patterns: (1) the RF system and (2) traditional flat planting (TF) with three deficit irrigation levels (150, 75, 0 mm) under three simulated rainfall intensity (1: 275, 2: 200, 3: 125 mm), and determined soil water storage profile, evapotranspiration rate, grain filling rate, biomass, grain yield, and net economic return...
2017: Frontiers in Plant Science
Saranjam Khan, Rahat Ullah, Asifullah Khan, Anabia Sohail, Noorul Wahab, Muhammad Bilal, Mushtaq Ahmed
This work presents the evaluation of Raman spectroscopy using random forest (RF) for the analysis of dengue fever in the infected human sera. A total of 100 dengue suspected blood samples, collected from Holy Family Hospital, Rawalpindi, Pakistan, have been used in this study. Out of these samples, 45 were dengue-positive based on immunoglobulin M (IgM) capture enzyme-linked immunosorbent assay (ELISA) tests. For highlighting the spectral differences between normal and infected samples, an effective machine learning system is developed that automatically learns the pattern of the shift in spectrum for the dengue compared to normal cases and thus is able to predict the unknown class based on the known example...
September 2017: Applied Spectroscopy
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