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https://www.readbyqxmd.com/read/28710572/tuning-the-electronic-and-optical-properties-of-ndt-based-conjugated-polymers-by-adopting-fused-heterocycles-as-acceptor-units-a-theoretical-study
#1
Na Cheng, Changqiao Zhang, Yongjun Liu
Donor-acceptor conjugated polymers have been successfully applied in bulk heterojunction solar cell devices. Tuning their donor and acceptor units allows the design of new polymers with desired electronic and optical properties. Here, to screen new candidate polymers based on a newly synthesized donor unit, dithieo[2,3-d:2',3'-d']naphtho[1,2-b:3,4-b']dithiophene (NDT), a series of model polymers with different acceptor units were designed and denoted NDT-A0 to NDT-A12, and the structures and optical properties of those polymers were investigated using DFT and TDDFT calculations...
August 2017: Journal of Molecular Modeling
https://www.readbyqxmd.com/read/28609089/light-triggered-ternary-device-and-inverter-based-on-heterojunction-of-van-der-waals-materials
#2
Jaewoo Shim, Seo-Hyeon Jo, Minwoo Kim, Young Jae Song, Jeehwan Kim, Jin-Hong Park
Multivalued logic (MVL) devices/circuits have received considerable attention because the binary logic used in current Si complementary metal-oxide-semiconductor (CMOS) technology cannot handle the predicted information throughputs and energy demands of the future. To realize MVL, the conventional transistor platform needs to be redesigned to have two or more distinctive threshold voltages (VTHs). Here, we report a finding: the photoinduced drain current in graphene/WSe2 heterojunction transistors unusually decreases with increasing gate voltage under illumination, which we refer to as the light-induced negative differential transconductance (L-NDT) phenomenon...
June 27, 2017: ACS Nano
https://www.readbyqxmd.com/read/28587124/comparison-study-between-rms-and-edge-detection-image-processing-algorithms-for-a-pulsed-laser-uwpi-ultrasonic-wave-propagation-imaging-based-ndt-technique
#3
Changgil Lee, Aoqi Zhang, Byoungjoon Yu, Seunghee Park
In this study, a non-contact laser ultrasonic propagation imaging technique was applied to detect the damage of plate-like structures. Lamb waves were generated by an Nd:YAG pulse laser system, while a galvanometer-based laser scanner was used to scan the preliminarily designated area. The signals of the structural responses were measured using a piezoelectric sensor attached on the front or back side of the plates. The obtained responses were analyzed by calculating the root mean square (RMS) values to achieve the visualization of structural defects such as crack, corrosion, and so on...
May 26, 2017: Sensors
https://www.readbyqxmd.com/read/28582897/reflex-mediated-dynamic-neuromuscular-stabilization-in-stroke-patients-emg-processing-and-ultrasound-imaging
#4
Hyun S Yoon, Joshua Sung H You
BACKGROUND: Postural core instability is associated with poor dynamic balance and a high risk of serious falls. Both neurodevelopmental treatment (NDT) and dynamic neuromuscular stabilization (DNS) core stabilization exercises have been used to improve core stability, but the outcomes of these treatments remain unclear. OBJECTIVE: This study was undertaken to examine the therapeutic effects of NDT and DNS core stabilization exercises on muscular activity, core stability, and core muscle thickness...
May 19, 2017: Technology and Health Care: Official Journal of the European Society for Engineering and Medicine
https://www.readbyqxmd.com/read/28567656/nasoduodenal-tube-placement-are-two-views-necessary-to-confirm-position
#5
Anh-Vu Ngo, Stephen Done, Randolph Otto, Seth Friedman, A Luana Stanescu
BACKGROUND: Nasoduodenal tube (NDT) placement is typically performed at the bedside and two-view abdominal radiographs are usually used to confirm tube position. Anecdotally, in most instances the lateral view is unnecessary and utilizes more than twice the radiation than an anteroposterior (AP) view alone. OBJECTIVE: We hypothesize that NDT location can be determined using only the AP view, with the NDT position determined on two views utilized as the gold standard...
May 31, 2017: Pediatric Radiology
https://www.readbyqxmd.com/read/28508771/alkylthiol-self-assembled-monolayers-on-au-111-with-tailored-tail-groups-for-attaching-gold-nanoparticles
#6
V Y Kutsenko, Y Y Lopatina, L Bossard-Giannesini, O A Marchenko, O Pluchery, S V Snegir
Self-assembled monolayers (SAMs) on Au(111) are able to control the functionality of a gold surface. We use scanning tunnelling microscopy (STM) in air and contact angle measurements to compare the morphology and the chemistry of three alkylthiol SAMs differing by their tail groups: 1,9-nonanedithiol (NDT), 1,4-butanedithiol (BDT) and 11-mercaptoundecanol (MUOH). STM reveals very different morphologies: a hexagonal lattice for MUOH and parallel rows for NDT and BDT. In the case of NDT, we find that the thiol tail groups may form disulfide bridges with long immersion times...
May 16, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28505130/a-review-of-microwave-thermography-nondestructive-testing-and-evaluation
#7
REVIEW
Hong Zhang, Ruizhen Yang, Yunze He, Ali Foudazi, Liang Cheng, Guiyun Tian
Microwave thermography (MWT) has many advantages including strong penetrability, selective heating, volumetric heating, significant energy savings, uniform heating, and good thermal efficiency. MWT has received growing interest due to its potential to overcome some of the limitations of microwave nondestructive testing (NDT) and thermal NDT. Moreover, during the last few decades MWT has attracted growing interest in materials assessment. In this paper, a comprehensive review of MWT techniques for materials evaluation is conducted based on a detailed literature survey...
May 15, 2017: Sensors
https://www.readbyqxmd.com/read/28499336/optical-properties-of-gold-nanoparticle-assemblies-on-a-glass-surface
#8
M O Stetsenko, S P Rudenko, L S Maksimenko, B K Serdega, O Pluchery, S V Snegir
The assemblies of cross-linked gold nanoparticles (AuNP) attract lot of scientific attention due to feasible perspectives of their use for development of scaled contact electrodes. Here, we developed and tested method of solid-state formation of dimers created from small AuNP (~18 nm) cross-linked with 1.9-nonadithiol (NDT) molecules. The morphology of created coating of a glass surface and its optical-polarization properties have been studied in detail by combination of scanning electron microscopy, atomic force microscopy, UV-visible spectroscopy, and modulation-polarization spectroscopy...
December 2017: Nanoscale Research Letters
https://www.readbyqxmd.com/read/28499024/welcome-editorial-by-the-new-ndt-editor-in-chief
#9
Denis Fouque
No abstract text is available yet for this article.
May 1, 2017: Nephrology, Dialysis, Transplantation
https://www.readbyqxmd.com/read/28441738/simulation-study-of-the-localization-of-a-near-surface-crack-using-an-air-coupled-ultrasonic-sensor-array
#10
Steven Delrue, Vladislav Aleshin, Mikael Sørensen, Lieven De Lathauwer
The importance of Non-Destructive Testing (NDT) to check the integrity of materials in different fields of industry has increased significantly in recent years. Actually, industry demands NDT methods that allow fast (preferably non-contact) detection and localization of early-stage defects with easy-to-interpret results, so that even a non-expert field worker can carry out the testing. The main challenge is to combine as many of these requirements into one single technique. The concept of acoustic cameras, developed for low frequency NDT, meets most of the above-mentioned requirements...
April 22, 2017: Sensors
https://www.readbyqxmd.com/read/28429343/post-prandial-effects-of-hazelnut-enriched-high-fat-meal-on-ldl-oxidative-status-oxidative-and-inflammatory-gene-expression-of-healthy-subjects-a-randomized-trial
#11
L Di Renzo, G Merra, R Botta, P Gualtieri, A Manzo, M A Perrone, M Mazza, S Cascapera, A De Lorenzo
OBJECTIVE: Postprandial oxidative stress is characterized by an increased susceptibility of the organism towards oxidative damage after consumption of a meal rich in lipids and/or carbohydrates. Micronutrients modulate the immune system and exert a protective action by reducing low-density lipoproteins oxidation (ox-LDL) via induction of antioxidant enzymes. SUBJECTS AND METHODS: The clinical study was a randomized and cross-over trial, conducted through the CONSORT flowchart...
April 2017: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/28391938/visible-light-driven-mineralization-of-spiramycin-over-photostructured-n-doped-tio2-on-up-conversion-phosphors
#12
Olga Sacco, Vincenzo Vaiano, Diana Sannino, Paolo Ciambelli
A novel visible light-active photocatalyst formulation (NdT/OP) was obtained by supporting N-doped TiO2 (NdT) particles on up-conversion luminescent organic phosphors (OP). The photocatalytic activity of such catalysts was evaluated for the mineralization process of spiramycin in aqueous solution. The effect of NdT loading in the range 15-60wt.% on bulk and surface characteristics of NdT/OP catalysts was investigated by several chemico-physical characterization techniques. The photocatalytic performance of NdT/OP catalysts in the removal of spyramicin from aqueous solution was assessed through photocatalytic tests under visible light irradiation...
April 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28368338/electronic-noses-for-composites-surface-contamination-detection-in-aerospace-industry
#13
Saverio De Vito, Maria Lucia Miglietta, Ettore Massera, Grazia Fattoruso, Fabrizio Formisano, Tiziana Polichetti, Maria Salvato, Brigida Alfano, Elena Esposito, Girolamo Di Francia
The full exploitation of Composite Fiber Reinforced Polymers (CFRP) in so-called green aircrafts design is still limited by the lack of adequate quality assurance procedures for checking the adhesive bonding assembly, especially in load-critical primary structures. In this respect, contamination of the CFRP panel surface is of significant concern since it may severely affect the bonding and the mechanical properties of the joint. During the last years, the authors have developed and tested an electronic nose as a non-destructive tool for pre-bonding surface inspection for contaminants detection, identification and quantification...
April 2, 2017: Sensors
https://www.readbyqxmd.com/read/28319821/application-of-p4-polyphase-codes-pulse-compression-method-to-air-coupled-ultrasonic-testing-systems
#14
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
#15
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 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 the energy levels, crystallinity, morphology, charge recombination, and charge carrier mobility in the resulting polymers...
March 29, 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
#16
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
#17
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
#18
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
#19
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
#20
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
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