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https://www.readbyqxmd.com/read/29245848/linear-laser-fast-scanning-thermography-ndt-for-artificial-disbond-defects-in-thermal-barrier-coatings
#1
Zhanwei Liu, Dacheng Jiao, Wenxiong Shi, Huimin Xie
Interface disbond in thermal barrier coatings (TBCs) is one of the key issues that cause their premature failure. In general, blind hole defects are often used as substitutes in transient thermography. The linear laser fast scanning thermography (LLFST) method was developed in this study and combined with several post-processing algorithms to accurately detect blind hole defects in TBCs. Through numerical simulation and experimental verification, a unique thermal response characteristic of blind holes in the cooling phase, namely a distinct "tailing" phenomenon, was summarized and utilized to recognize small defects...
December 11, 2017: Optics Express
https://www.readbyqxmd.com/read/29232845/hybrid-signal-processing-technique-to-improve-the-defect-estimation-in-ultrasonic-non-destructive-testing-of-composite-structures
#2
Kumar Anubhav Tiwari, Renaldas Raisutis, Vykintas Samaitis
This work proposes a novel hybrid signal processing technique to extract information on disbond-type defects from a single B-scan in the process of non-destructive testing (NDT) of glass fiber reinforced plastic (GFRP) material using ultrasonic guided waves (GW). The selected GFRP sample has been a segment of wind turbine blade, which possessed an aerodynamic shape. Two disbond type defects having diameters of 15 mm and 25 mm were artificially constructed on its trailing edge. The experiment has been performed using the low-frequency ultrasonic system developed at the Ultrasound Institute of Kaunas University of Technology and only one side of the sample was accessed...
December 9, 2017: Sensors
https://www.readbyqxmd.com/read/29186910/mn-doped-cabi%C3%A2-ti%C3%A2-o15-pb-zr-ti-o%C3%A2-ultrasonic-transducers-for-continuous-monitoring-at-elevated-temperatures
#3
Makiko Kobayashi, Taiga Kibe, Hajime Nagata
Continuous ultrasonic in-situ monitoring for industrial applications is difficult owing to the high operating temperatures in industrial fields. It is expected that ultrasonic transducers consisting of a CaBi₄Ti₄O15(CBT)/Pb(Zr,Ti)O₃(PZT) sol-gel composite could be one solution for ultrasonic nondestructive testing (NDT) above 500 °C because no couplant is required and CBT has a high Curie temperature. To verify the high temperature durability, CBT/PZT sol-gel composite films were fabricated on titanium substrates by spray coating, and the CBT/PZT samples were tested in a furnace at various temperatures...
November 27, 2017: Sensors
https://www.readbyqxmd.com/read/29171980/effectiveness-of-neuro-developmental-treatment-bobath-concept-on-postural-control-and-balance-in-cerebral-palsied-children
#4
Fatih Tekin, Erdogan Kavlak, Ugur Cavlak, Filiz Altug
BACKGROUND AND OBJECTIVE: The aim of this study was to show the effects of an 8-week Neurodevelopmental Treatment based posture and balance training on postural control and balance in diparetic and hemiparetic Cerebral Palsied children (CPC). METHODS: Fifteen CPC (aged 5-15 yrs) were recruited from Denizli Yağmur Çocukları Rehabilitation Centre. Gross Motor Function Classification System, Gross Motor Function Measure, 1-Min Walking Test, Modified Timed Up and Go Test, Paediatric Balance Scale, Functional Independence Measure for Children and Seated Postural Control Measure were used for assessment before and after treatment...
November 17, 2017: Journal of Back and Musculoskeletal Rehabilitation
https://www.readbyqxmd.com/read/29128914/simultaneous-determination-of-tolterodine-and-its-two-metabolites-5-hydroxymethyltolterodine-and-n-dealkyltolterodine-in-human-plasma-using-lc-ms-ms-and-its-application-to-a-pharmacokinetic-study
#5
Young-Hoon Kim, Ji-Yeong Byeon, Se-Hyung Kim, Choong-Min Lee, Eui Hyun Jung, Won Ki Chae, Choon-Gon Jang, Seok-Yong Lee, Yun Jeong Lee
Tolterodine is a nonselective muscarinic antagonist that is indicated for the overactive urinary bladder and other urinary difficulties. We developed and validated a simple, rapid and sensitive high-performance liquid chromatography analytical method utilizing tandem mass spectrometry (LC-MS/MS) for the quantitation of tolterodine and its major metabolites, 5-hydroxymethyltolterodine (5-HMT) and N-dealkyltolterodine (NDT), in human plasma. After liquid-liquid extraction with methyl t-butyl ether, chromatographic separation of the three analytes was achieved using a reversed-phase Luna Phenyl-hexyl column (100 × 2...
November 11, 2017: Archives of Pharmacal Research
https://www.readbyqxmd.com/read/29103551/decision-support-tools-in-low-back-pain
#6
REVIEW
Veerle M H Coupé, Miranda L van Hooff, Marinus de Kleuver, Ewout W Steyerberg, Raymond W J G Ostelo
Information from individual classification systems or clinical prediction rules that aim to facilitate stratified care in low back pain is important but often not comprehensive enough to be used to support clinical decision-making. The development and implementation of a clinically useful decision support tool (DST) that considering all key features is a challenging enterprise, requiring a multidisciplinary approach. Key features are inclusion of all relevant treatment options, patient characteristics, and benefits and harms and presentation as an accessible and easy to use toolkit...
December 2016: Best Practice & Research. Clinical Rheumatology
https://www.readbyqxmd.com/read/29078096/guided-ultrasonic-waves-for-determining-effective-orthotropic-material-parameters-of-continuous-fiber-reinforced-thermoplastic-plates
#7
Manuel Webersen, Sarah Johannesmann, Julia Düchting, Leander Claes, Bernd Henning
Ultrasonic methods are widely established in the NDE/NDT community, where they are mostly used for the detection of flaws and structural damage in various components. A different goal, despite the similar technological approach, is non-destructive material characterization, i.e. the determination of parameters like Young's modulus. Only few works on this topic have considered materials with high damping and strong anisotropy, such as continuous-fiber reinforced plastics, but due to the increasing demand in the industry, appropriate methods are needed...
October 6, 2017: Ultrasonics
https://www.readbyqxmd.com/read/29071541/nutrient-drink-test-normative-values-in-indian-children
#8
Upender Shava, Anshu Srivastava, Amrita Mathias, Surender Kumar Yachha, Ujjal Poddar
BACKGROUND: Nutrient drink test (NDT) is a simple, non-invasive method to assess gastric function including accommodation. However, data on normal satiety drink volume (SDV) in children is scanty with no information about postprandial symptoms (PPS). Our aims were to establish normal values of NDT in healthy children and evaluate its correlation with age, gender, and anthropometry. METHODS: Six- to 18-year-old healthy children underwent the NDT. The nutrient drink (0...
September 2017: Indian Journal of Gastroenterology: Official Journal of the Indian Society of Gastroenterology
https://www.readbyqxmd.com/read/28957689/-the-effects-of-family-centered-physiotherapy-on-the-cognitive-and-motor-performance-in-premature-infants
#9
Bulent Elbasan, Murat Fatih Kocyigit, A Sebnem Soysal-Acar, Yıldız Atalay, Kivilcim Gucuyener
OBJECTIVE: The aim of this study is to investigate the effects of family centered physiotherapy according to the neurodevelopmental treatment (NDT) principles on mental and motor performance in premature infants. METHODS: A total of 156 infant, ≥24/36 week+6days gestational age included in the study. All the infants were diagnosed by a child neurologist and referred to psychology and physiotherapy department for their neurodevelopmental assessment and treatment...
September 25, 2017: Infant Behavior & Development
https://www.readbyqxmd.com/read/28956855/eddy-current-testing-with-giant-magnetoresistance-gmr-sensors-and-a-pipe-encircling-excitation-for-evaluation-of-corrosion-under-insulation
#10
Joseph Bailey, Nicholas Long, Arvid Hunze
This work investigates an eddy current-based non-destructive testing (NDT) method to characterize corrosion of pipes under thermal insulation, one of the leading failure mechanisms for insulated pipe infrastructure. Artificial defects were machined into the pipe surface to simulate the effect of corrosion wall loss. We show that by using a giant magnetoresistance (GMR) sensor array and a high current (300 A), single sinusoidal low frequency (5-200 Hz) pipe-encircling excitation scheme it is possible to quantify wall loss defects without removing the insulation or weather shield...
September 28, 2017: Sensors
https://www.readbyqxmd.com/read/28946545/impact-of-foot-pronation-on-postural-stability-an-observational-study
#11
Ghada Mohamed Koura, Doaa Ayoub Elimy, Hamada Ahmed Hamada, Hossam Eddien Fawaz, Mohamed Hussein Elgendy, Ibtissam M Saab
OBJECTIVE: To investigate the effect of foot pronation on the dynamic balance including overall stability index (OAI), anteroposterior stability index (APSI) and mediolateral stability index (MLSI). METHODS: Forty participants from both sexes were selected from the Faculty of Physical Therapy, Cairo University, with a mean age of 23.55 ± 1.74 years. Subjects were divided into two groups: group A (8 males and 12 females) with foot pronation, and group B (9 males and 11 females) with normal feet...
September 15, 2017: Journal of Back and Musculoskeletal Rehabilitation
https://www.readbyqxmd.com/read/28927269/discovery-of-tamoxifen-and-n-desmethyl-tamoxifen-protein-targets-in-mcf-7-cells-using-large-scale-protein-folding-and-stability-measurements
#12
Ryenne N Ogburn, Lorrain Jin, He Meng, Michael C Fitzgerald
The proteins in an MCF-7 cell line were probed for tamoxifen (TAM) and n-desmethyl tamoxifen (NDT) induced stability changes using the Stability of Proteins from Rates of Oxidation (SPROX) technique in combination with two different quantitative proteomics strategies, including one based on SILAC and one based on isobaric mass tags. Over 1000 proteins were assayed for TAM- and NDT-induced protein stability changes, and a total of 163 and 200 protein hits were identified in the TAM and NDT studies, respectively...
November 3, 2017: Journal of Proteome Research
https://www.readbyqxmd.com/read/28894172/extraordinary-transport-characteristics-and-multivalue-logic-functions-in-a-silicon-based-negative-differential-transconductance-device
#13
Sejoon Lee, Youngmin Lee, Changmin Kim
High-performance negative-differential transconductance (NDT) devices are fabricated in the form of a gated p(+)-i-n(+) Si ultra-thin body transistor. The devices clearly display a Λ-shape transfer characteristic (i.e., Λ-NDT peak) at room temperature, and the NDT behavior is fully based on the gate-modulation of the electrostatic junction characteristics along source-channel-drain. The largest peak-to-valley current ratio of the Λ-NDT peak is greater than 10(4), the smallest full-width at half-maximum is smaller than 170 mV, and the best swing-slope at the Λ-NDT peak region is ~70 mV/dec...
September 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28869434/effects-of-neuromuscular-electrical-stimulation-and-kinesio-taping-applications-in-children-with-cerebral-palsy-on-postural-control-and-sitting-balance
#14
Bulent Elbasan, Kamile Uzun Akaya, Mufit Akyuz, Deran Oskay
BACKGROUND: Neurodevelopmental treatment (NDT), neuromuscular electrical stimulation (NMES), and Kinesio Taping (KT) applications are separately used to improve postural control and sitting balance in children with cerebral palsy (CP). OBJECTIVE: The aim of this study is to examine the combined effect of NDT, NMES and KT applications on postural control and sitting balance in children with CP. METHODS: Forty five children, in 3 groups, between the ages 5-12 years were included in the study...
August 21, 2017: Journal of Back and Musculoskeletal Rehabilitation
https://www.readbyqxmd.com/read/28867790/development-of-embedded-em-sensors-for-estimating-tensile-forces-of-psc-girder-bridges
#15
Junkyeong Kim, Ju-Won Kim, Chaggil Lee, Seunghee Park
The tensile force of pre-stressed concrete (PSC) girders is the most important factor for managing the stability of PSC bridges. The tensile force is induced using pre-stressing (PS) tendons of a PSC girder. Because the PS tendons are located inside of the PSC girder, the tensile force cannot be measured after construction using conventional NDT (non-destructive testing) methods. To monitor the induced tensile force of a PSC girder, an embedded EM (elasto-magnetic) sensor was proposed in this study. The PS tendons are made of carbon steel, a ferromagnetic material...
August 30, 2017: Sensors
https://www.readbyqxmd.com/read/28858230/a-smart-eddy-current-sensor-dedicated-to-the-nondestructive-evaluation-of-carbon-fibers-reinforced-polymers
#16
Mohammed Naidjate, Bachir Helifa, Mouloud Feliachi, Iben-Khaldoun Lefkaier, Henning Heuer, Martin Schulze
This paper propose a new concept of an eddy current (EC) multi-element sensor for the characterization of carbon fiber-reinforced polymers (CFRP) to evaluate the orientations of plies in CFRP and the order of their stacking. The main advantage of the new sensors is the flexible parametrization by electronical switching that reduces the effort for mechanical manipulation. The sensor response was calculated and proved by 3D finite element (FE) modeling. This sensor is dedicated to nondestructive testing (NDT) and can be an alternative for conventional mechanical rotating and rectangular sensors...
August 31, 2017: Sensors
https://www.readbyqxmd.com/read/28815050/a-case-of-azoospermia-in-a-non-destructive-testing%C3%A2-worker-exposed-to-radiation
#17
Jaechan Park, Sanggil Lee, Chulyong Park, Huisu Eom
BACKGROUND: Interest in radiation-related health problems has been growing with the increase in the number of workers in radiation-related jobs. Although an occupational level of radiation exposure would not likely cause azoospermia, several studies have reported the relation between radiation exposure and azoospermia after accidental or therapeutic radiation exposure. We describe a case of azoospermia in a non-destructive testing (NDT) worker exposed to radiation and discuss the problems of the related monitoring system...
2017: Annals of Occupational and Environmental Medicine
https://www.readbyqxmd.com/read/28810727/ndt-digest-rapid-revelations-in-renal-disease
#18
Kate Stevens, Denis Fouque
No abstract text is available yet for this article.
August 1, 2017: Nephrology, Dialysis, Transplantation
https://www.readbyqxmd.com/read/28773149/using-biotechnology-to-solve-engineering-problems-non-destructive-testing-of-microfabrication-components
#19
Carla C C R de Carvalho, Patrick L Inácio, Rosa M Miranda, Telmo G Santos
In an increasingly miniaturised technological world, non-destructive testing (NDT) methodologies able to detect defects at the micro scale are necessary to prevent failures. Although several existing methods allow the detection of defects at that scale, their application may be hindered by the small size of the samples to examine. In this study, the application of bacterial cells to help the detection of fissures, cracks, and voids on the surface of metals is proposed. The application of magnetic and electric fields after deposition of the cells ensured the distribution of the cells over the entire surfaces and helped the penetration of the cells inside the defects...
July 12, 2017: Materials
https://www.readbyqxmd.com/read/28772980/sparse-and-dispersion-based-matching-pursuit-for-minimizing-the-dispersion-effect-occurring-when-using-guided-wave-for-pipe-inspection
#20
Javad Rostami, Peter W T Tse, Zhou Fang
Ultrasonic guided wave is an effective tool for structural health monitoring of structures for detecting defects. In practice, guided wave signals are dispersive and contain multiple modes and noise. In the presence of overlapped wave-packets/modes and noise together with dispersion, extracting meaningful information from these signals is a challenging task. Handling such challenge requires an advanced signal processing tool. The aim of this study is to develop an effective and robust signal processing tool to deal with the complexity of guided wave signals for non-destructive testing (NDT) purpose...
June 6, 2017: Materials
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