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https://www.readbyqxmd.com/read/28319821/application-of-p4-polyphase-codes-pulse-compression-method-to-air-coupled-ultrasonic-testing-systems
#1
Honggang Li, Zhenggan Zhou
Air-coupled ultrasonic testing systems are usually restricted by low signal-to-noise ratios (SNR). The use of pulse compression techniques based on P4 Polyphase codes can improve the ultrasound SNR. This type of codes can generate higher Peak Side Lobe (PSL) ratio and lower noise of compressed signal. This paper proposes the use of P4 Polyphase sequences to code ultrasound with a NDT system based on air-coupled piezoelectric transducer. Furthermore, the principle of selecting parameters of P4 Polyphase sequence for obtaining optimal pulse compression effect is also studied...
March 3, 2017: Ultrasonics
https://www.readbyqxmd.com/read/28317382/effects-on-photovoltaic-performance-of-dialkyloxy-benzothiadiazole-copolymers-by-varying-the-thienoacene-donor
#2
Gururaj P Kini, Sora Oh, Zaheer Abbas, Shafket Rasool, Muhammad Jahandar, Chang Eun Song, Sang Kyu Lee, Won Suk Shin, Won-Wook So, Jong-Cheol Lee
A series of four donor-acceptor alternating copolymers based on dialkyloxy-benzothiadiazole (ROBT) as an acceptor and thienoacenes as a donor units were synthesized and tested for polymer solar cells (PSCs). These new polymers had different donor units with varied electron-donating ability (thieno[3,2-b]thiophene (TT), dithieno[3,2-b:2',3'-d]thiophene (DTT), benzo[1,2-b:4,5-b']dithiophene (BDT) and naphtha[1,2-b:5,6-b']dithiophene (NDT)) in the polymer backbone. To understand the effect of these thienoacenes on the optoelectronic and photovoltaic properties of the copolymers, we systematically analyzed and compared energy levels, crystallinity, morphology, charge recombination and charge carrier mobility in the resulting polymers...
March 20, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28289640/efficacy-of-intensive-neurodevelopmental-treatment-for-children-with-developmental-delay-with-or-without-cerebral-palsy
#3
Kyoung Hwan Lee, Jin Woo Park, Ho Jun Lee, Ki Yeun Nam, Tae June Park, Hee Jae Kim, Bum Sun Kwon
OBJECTIVE: To evaluate the effectiveness of intensive neurodevelopmental treatment (NDT) on gross motor function for the children having developmental delay (DD), with or without cerebral palsy (CP). METHODS: Forty-two children had intensive NDT three times weekly, 60 minutes a day, for 3 months, immediately followed by conventional NDT once or twice a week, 30 minutes a day, for another 3 months. We assessed Gross Motor Function Measure (GMFM) over three time points: before conventional NDT, before and after intensive NDT, and after 3 months of additional conventional NDT...
February 2017: Annals of Rehabilitation Medicine
https://www.readbyqxmd.com/read/28269430/initial-experiments-of-a-128-channel-fpga-and-pc-based-ultrasound-imaging-system-for-teaching-and-research-activities
#4
Amauri Amorin Assef, Joaquim Miguel Maia, Eduardo Tavares Costa
Although widely employed in medical diagnostic applications, most of the available commercial ultrasound (US) scanners do not always fit the needs of research users. Access to raw US data, portability, flexibility and advanced user control are essential features to explore alternative biomedical signal and imaging processing algorithms. In this paper, we present the initial results of a reconfigurable, cost-effective and modular 128-channel FPGA and PC-based US system, specifically designed for teaching and medical imaging research...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28227676/initial-experiments-of-a-128-channel-fpga-and-pc-based-ultrasound-imaging-system-for-teaching-and-research-activities
#5
Amauri Amorin Assef, Joaquim Miguel Maia, Eduardo Tavares Costa, Amauri Amorin Assef, Joaquim Miguel Maia, Eduardo Tavares Costa, Amauri Amorin Assef, Joaquim Miguel Maia, Eduardo Tavares Costa
Although widely employed in medical diagnostic applications, most of the available commercial ultrasound (US) scanners do not always fit the needs of research users. Access to raw US data, portability, flexibility and advanced user control are essential features to explore alternative biomedical signal and imaging processing algorithms. In this paper, we present the initial results of a reconfigurable, cost-effective and modular 128-channel FPGA and PC-based US system, specifically designed for teaching and medical imaging research...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28111069/mechanical-characterization-and-comparison-of-energy-storage-and-return-prostheses
#6
Stacey M Rigney, Anne Simmons, Lauren Kark
The suitability of finite element analysis (FEA) for standardizing the mechanical characterization of energy storage and return (ESAR) prostheses was investigated. A methodology consisting of both experimental and numerical analysis was proposed and trialed for the Vari-flex(®) Modular(TM), Flex-foot Cheetah and Cheetah Xtreme by Össur(®) and a 1E90 Sprinter by Ottobock(®). Gait analysis was conducted to determine suitable orientation angles for non-destructive testing (NDT) of the ESAR prostheses followed by a quasi-static inverse FEA procedure within COMSOL Multiphysics(®), where the NDT conditions were replicated to determine the homogenized material properties of the prostheses...
January 20, 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/28103060/a-new-algorithm-using-the-non-dominated-tree-to-improve-non-dominated-sorting
#7
Patrik Gustavsson, Anna Syberfeldt
Non-dominated sorting is a technique often used in evolutionary algorithms to determine the quality of solutions in a population. The most common algorithm is the Fast Non-dominated Sort (FNS). This algorithm, however, has the drawback that its performance deteriorates when the population size grows. The same drawback applies also to other non-dominating sorting algorithms such as the Efficient Non-dominated Sort with Binary Strategy (ENS-BS). An algorithm suggested to overcome this drawback is the Divide-and-Conquer Non-dominated Sort (DCNS) which works well on a limited number of objectives but deteriorates when the number of objectives grows...
January 19, 2017: Evolutionary Computation
https://www.readbyqxmd.com/read/27958434/detecting-defects-in-marine-structures-by-using-eddy-current-infrared-thermography
#8
W Swiderski
Eddy current infrared (IR) thermography is a new nondestructive testing (NDT) technique used for the detection of cracks in electroconductive materials. By combining the well-established inspection methods of eddy current NDT and IR thermography, this technique uses induced eddy currents to heat test samples. In this way, IR thermography allows the visualization of eddy current distribution that is distorted in defect sites. This paper discusses the results of numerical modeling of eddy current IR thermography procedures in application to marine structures...
December 1, 2016: Applied Optics
https://www.readbyqxmd.com/read/27816871/a-new-omnidirectional-shear-horizontal-wave-transducer-using-face-shear-d24-piezoelectric-ring-array
#9
Hongchen Miao, Qiang Huan, Qiangzhong Wang, Faxin Li
The non-dispersive fundamental shear horizontal (SH0) wave in plate-like structures is of practical importance in non-destructive testing (NDT) and structural health monitoring (SHM). Theoretically, an omnidirectional SH0 transducer phased array system can be used to inspect defects in a large plate in the similar manner to the phased array transducers used in medical B-scan ultrasonics. However, very few omnidirectional SH0 transducers have been proposed so far. In this work, an omnidirectional SH0 wave piezoelectric transducer (OSH-PT) was proposed, which consists of a ring array of twelve face-shear (d24) trapezoidal PZT elements...
February 2017: Ultrasonics
https://www.readbyqxmd.com/read/27789901/assigning-treatment-to-hcc-patients-for-transplantation-utility-of-a-new-decision-making-tool
#10
COMPARATIVE STUDY
Najmul Hassan Shah, Faisal Saud Dar, Abu Bakar Hafeez Bhatti, Atif Rana, Mohammad Salih
BACKGROUND The Barcelona clinic liver cancer (BCLC) staging system is considered the standard of care for hepatocellular carcinoma (HCC) management. It has various limitations, including lack of second-line treatment options and combination therapy. We prospectively collected data on our HCC patients based on a new decision-making tool (NDT). The objective of this study was to determine the applicability of this tool and compare it with BCLC for treatment allocation, in particular with respect to liver transplantation...
October 28, 2016: Annals of Transplantation: Quarterly of the Polish Transplantation Society
https://www.readbyqxmd.com/read/27768125/distress-and-coping-self-efficacy-in-inpatient-oncology-nurses
#11
Lara Wahlberg, Anita Nirenberg, Elizabeth Capezuti
PURPOSE/OBJECTIVES: To examine distress and coping self-efficacy in inpatient oncology nurses. 
. DESIGN: Cross-sectional survey design.
. SETTING: Oncology Nursing Society (ONS) chapter meetings and Hunter-Bellevue School of Nursing, both in New York, New York, as well as social media.
. SAMPLE: 163 oncology nurses who work with an inpatient adult population.
. METHODS: Participants were recruited through the ONS New York, New York, area chapter meetings, Hunter College, and ONS Facebook pages...
November 1, 2016: Oncology Nursing Forum
https://www.readbyqxmd.com/read/27756789/application-of-mice-humanized-for-cyp2d6-to-the-study-of-tamoxifen-metabolism-and-drug-drug-interaction-with-antidepressants
#12
A Kenneth MacLeod, Lesley A McLaughlin, Colin J Henderson, C Roland Wolf
Tamoxifen is an estrogen receptor antagonist used in the treatment of breast cancer. It is a prodrug that is converted by several cytochrome P450 enzymes to a primary metabolite, N-desmethyltamoxifen (NDT), which is then further modified by CYP2D6 to a pharmacologically potent secondary metabolite, 4-hydroxy-N-desmethyltamoxifen (endoxifen). Antidepressants (ADs), which are often coprescribed to patients receiving tamoxifen, are also metabolized by CYP2D6 and evidence suggests that a drug-drug interaction between these agents adversely affects the outcome of tamoxifen therapy by inhibiting endoxifen formation...
January 2017: Drug Metabolism and Disposition: the Biological Fate of Chemicals
https://www.readbyqxmd.com/read/27716681/separable-scatter-model-of-the-detector-and%C3%A2-object-contributions-using-continuously-thickness-adapted-kernels-in-cbct
#13
Navnina Bhatia, David Tisseur, Solene Valton, Jean Michel Létang
Due to the increased cone beam coverage and the introduction of flat panel detector, the size of X-ray illumination fields has grown dramatically in Cone Beam Computed Tomography (CBCT), causing an increase in scatter radiation. Existing reconstruction algorithms do not model the scatter radiation, so scatter artifacts appear in the reconstruction images. The contribution of scattering of photons inside the detector itself becomes prominent and challenging in case of X-ray source of high energy (over a few 100 keV) which is used in typical industrial Non Destructive Testing (NDT)...
October 6, 2016: Journal of X-ray Science and Technology
https://www.readbyqxmd.com/read/27633076/the-effect-of-vestibular-stimulation-on-motor-functions-of-children-with-cerebral-palsy
#14
Marco Tramontano, Alessandra Medici, Marco Iosa, Alessia Chiariotti, Giulia Fusillo, Leonardo Manzari, Daniela Morelli
BACKGROUND: Cerebral palsy (CP) has been defined as a non-progressive disease of movement and posture development. Physical therapy techniques use different forms of sensory stimulation to improve neuromotor development. AIM: The aim of this study was to assess the efficacy of a vestibular stimulation training in improving motor functions in cerebral palsy. POPULATION: Fourteen children with CP were randomly separated into two different groups in a cross-over trial...
August 19, 2016: Motor Control
https://www.readbyqxmd.com/read/27621107/metformin-effect-on-non-targeted-metabolite-profiles-in-patients-with-type-2-diabetes-and-multiple-murine-tissues
#15
Jonathan Adam, Stefan Brandmaier, Jörn Leonhardt, Markus F Scheerer, Robert P Mohney, Tao Xu, Jie Bi, Markus Rotter, Martina Troll, Shen Chi, Margit Heier, Christian Herder, Wolfgang Rathmann, Guido Giani, Jerzy Adamski, Thomas Illig, Konstantin Strauch, Yixue Li, Christian Gieger, Annette Peters, Karsten Suhre, Donna Ankerst, Thomas Meitinger, Martin Hrabe de Angelis, Michael Roden, Susanne Neschen, Gabi Kastenmüller, Rui Wang-Sattler
Metformin is the first-line oral medication to increase insulin sensitivity in patients with type 2 diabetes (T2D). Our aim is to investigate metformin's pleiotropic effect using a non-targeted metabolomics approach. We analyzed 353 metabolites in fasting serum samples of the population-based human KORA F4 cohort. To compare T2D patients treated with metformin (mt-T2D, n=74) and those without antidiabetic medication (ndt-T2D, n=115), we used multivariable linear regression models in a cross-sectional study...
September 12, 2016: Diabetes
https://www.readbyqxmd.com/read/27613569/the-relationship-between-baseline-eeg-spectra-power-and-memory-performance-in-older-african-americans-endorsing-cognitive-concerns-in-a-community-setting
#16
Voyko Kavcic, Bojan Zalar, Bruno Giordani
The finding that some older individuals report declines in aspects of cognitive functioning is becoming a frequently used criteria to identify elderly at risk for mild cognitive impairment (MCI) and dementia. Once concerns are identified in a community setting, however, effective means are necessary to pinpoint those individuals who should go on to more complex and costly diagnostic evaluations (e.g., functional imaging). We tested 44 African American volunteers endorsing cognitive concerns (37 females, 7 males) age≥65years with CogState battery subtests and recorded resting-state EEG, with eyes closed...
November 2016: International Journal of Psychophysiology
https://www.readbyqxmd.com/read/27585746/the-influence-of-ndt-bobath-and-pnf-methods-on-the-field-support-and-total-path-length-measure-foot-pressure-cop-in-patients-after-stroke
#17
RANDOMIZED CONTROLLED TRIAL
Jolanta Krukowska, Marcin Bugajski, Monika Sienkiewicz, Jan Czernicki
In stroke patients, the NDT - (Bobath - Neurodevelopmental Treatment) and PNF (Proprioceptive Neuromuscular Facilitation) methods are used to achieve the main objective of rehabilitation, which aims at the restoration of maximum patient independence in the shortest possible period of time (especially the balance of the body). The aim of the study is to evaluate the effect of the NDT-Bobath and PNF methods on the field support and total path length measure foot pressure (COP) in patients after stroke. The study included 72 patients aged from 20 to 69 years after ischemic stroke with Hemiparesis...
November 2016: Neurologia i Neurochirurgia Polska
https://www.readbyqxmd.com/read/27552482/investigation-of-synthetic-aperture-methods-in-ultrasound-surface-imaging-using-elementary-surface-types
#18
W Kerr, S G Pierce, P Rowe
Synthetic aperture imaging methods have been employed widely in recent research in non-destructive testing (NDT), but uptake has been more limited in medical ultrasound imaging. Typically offering superior focussing power over more traditional phased array methods, these techniques have been employed in NDT applications to locate and characterise small defects within large samples, but have rarely been used to image surfaces. A desire to ultimately employ ultrasonic surface imaging for bone surface geometry measurement prior to surgical intervention motivates this research, and results are presented for initial laboratory trials of a surface reconstruction technique based on global thresholding of ultrasonic 3D point cloud data...
December 2016: Ultrasonics
https://www.readbyqxmd.com/read/27518426/anisotropic-effects-on-ultrasonic-guided-waves-propagation-in-composite-bends
#19
Xudong Yu, Madis Ratassepp, Prabhu Rajagopal, Zheng Fan
Ultrasonic guided waves have proven to be attractive to the long-range testing of composite laminates. As complex-shaped composite components are increasingly incorporated in high-performance structures, understanding of both anisotropic and geometric effects on guided waves propagation is needed to evaluate their suitability for the non-destructive testing (NDT) of such complex structures. This paper reports the Semi-Analytical Finite Element (SAFE) simulations revealing the capability of energy confinement carried by two types of guided modes in 90° carbon fiber/epoxy (CF/EP) bends...
December 2016: Ultrasonics
https://www.readbyqxmd.com/read/27517923/evaluation-of-an-extended-autocorrelation-phase-estimator-for-ultrasonic-velocity-profiles-using-nondestructive-testing-systems
#20
César Yutaka Ofuchi, Fabio Rizental Coutinho, Flávio Neves, Lucia Valéria Ramos de Arruda, Rigoberto Eleazar Melgarejo Morales
In this paper the extended autocorrelation velocity estimator is evaluated and compared using a nondestructive ultrasonic device. For this purpose, three velocity estimators are evaluated and compared. The autocorrelation method (ACM) is the most used and well established in current ultrasonic velocity profiler technology, however, the technique suffers with phase aliasing (also known as the Nyquist limit) at higher velocities. The cross-correlation method (CCM) is also well known and does not suffer with phase aliasing as it relies on time shift measurements between emissions...
2016: Sensors
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