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    Wyświetlanie 1-9 z 9
    Tytuł:
    Low frequency noise in Si and Si/SiGe/Si PMOSFETs
    Autorzy:
    Thomas, S. M.
    Prest, M. J.
    Fulgoni, D. J. F.
    Bacon, A. R.
    Grasby, T. J.
    Leadley, D. R.
    Parker, E. H. C.
    Whall, T. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/308779.pdf
    Data publikacji:
    2007
    Wydawca:
    Instytut Łączności - Państwowy Instytut Badawczy
    Tematy:
    electronic noise
    silicon-germanium heterostructures
    MOSFET
    dynamic threshold mode
    Opis:
    Measurements of 1/f noise in Si and Si0.64Ge0.36 PMOSFETs have been compared with theoretical models of carrier tunnelling into the oxide. Reduced noise is observed in the heterostructure device as compared to the Si control. We suggest that this is primarily associated with an energy dependent density of oxide trap states and a displacement of the Fermi level at the SiO2 interface in the heterostructure relative to Si. The present study also emphasizes the important role of transconductance enhancement in the dynamic threshold mode in lowering the input referred voltage noise.
    Źródło:
    Journal of Telecommunications and Information Technology; 2007, 2; 64-68
    1509-4553
    1899-8852
    Pojawia się w:
    Journal of Telecommunications and Information Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental studies for bearings degradation monitoring at an early stage using analysis of variance
    Autorzy:
    Zarour, D.
    Meziani, S.
    Thomas, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/328396.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Polskie Towarzystwo Diagnostyki Technicznej PAN
    Tematy:
    ANOVA
    DOE
    time descriptors
    bearing fault
    analiza wariancji
    łożysko
    usterka
    deskryptory czasu
    Opis:
    This work presents a procedure for bearing degradation monitoring at an early stage. The analysis of variance (ANOVA) coupled with Tukey’s test is used to single out the suitable parameters to follow the fault size evolution ranging from 50 µm to 150µm. The Tukey's criterion is adopted in this case to study the ability of time and frequency indicators. The rotational speed, centrifugal load and fault size are considered as independent variables while the time and frequency indicators are taken as dependent variables. The experiments are performed on bearings having a fault on outer race. Based on the results of this study, the Kurtosis and Skewness show a good ability to assess the evolution of degradation in the bearings at an early stage. The paper discusses the weakness of the time and frequency indicators.
    Źródło:
    Diagnostyka; 2018, 19, 4; 81-87
    1641-6414
    2449-5220
    Pojawia się w:
    Diagnostyka
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Design of Experiments for Statistically Predicting Risk of Adverse Health Effects on Drivers Exposed to Vertical Vibrations
    Autorzy:
    Ayari, H.
    Thomas, M.
    Dore, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/90147.pdf
    Data publikacji:
    2011
    Wydawca:
    Centralny Instytut Ochrony Pracy
    Tematy:
    adverse health effect
    whole-body vibration
    spinal loading
    finite element analysis
    ageing
    design of experiments
    Opis:
    An injury risk factor (IRF), which indicates the risk of adverse health effect to lumbar rachis arising from mechanical vibrations, is developed. Experiments have been conducted that consider acceleration levels at the seat of drivers, posture, morphology, density, damping rate and body mass as independent variables. A parametric finite-element model of the lumbar rachis has been generated. It is shown that the IRF increases with ageing and an IRF of 30% is proposed as a threshold for fatigue purposes. This level is reached if a peak acceleration level greater than 3 m/s2 is applied to a light (55 kg) and an old driver with a low bone density and a damping rate of 20%. This vibration threshold must be reduced to 2.7 m/s2 if the driverʼs weight increases to 75 kg and to 2 m/s2 if the driver is heavy (98 kg).
    Źródło:
    International Journal of Occupational Safety and Ergonomics; 2011, 17, 3; 221-232
    1080-3548
    Pojawia się w:
    International Journal of Occupational Safety and Ergonomics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthetic Textile Wastewater Treatment using Potassium Ferrate(VI) – Application of Taguchi Method for Optimisation of Experiment
    Oczyszczanie syntetycznych ścieków farbiarskich przy wykorzystaniu żelazianu(VI) potasu – zastosowanie metody Taguchi do optymalizacji eksperymentu
    Autorzy:
    Thomas, M.
    Barbusiński, K.
    Kliś, S.
    Szpyrka, E.
    Chyc, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/231779.pdf
    Data publikacji:
    2018
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych
    Tematy:
    textile wastewater
    potassium ferrate(VI)
    Acid Green 16
    Taguchi method
    ścieki tekstylne
    nadsiarczan potasu
    metoda Taguchi
    Opis:
    The article attempts to assess the usefulness of the Taguchi method to optimise the purification process of synthetic textile wastewater (pH 6.7 - 7.2, Conductivity = 6.71 - 6.84 mS/cm, Salinity = 3581 - 3648 mg NaCl/l, Colour = 560 - 4710 mg Pt/l, COD = 2220 - 2290 mg O2/l, TOC = 394 - 551 mg/l) using K2FeO4. The research was conducted using 3 types of wastewater containing anionic detergent (sodium lauryl sulfate, 100 mg/l) and differing only in the concentration of azo dye Acid Green 16 (AG 16). Technical K2FeO4 was used as an oxidiser, which was subjected to physico-chemical analysis (purity, UV-VIS spectrum, surface characteristics and chemical composition using SEM and EDX methods). For planning and optimising the wastewater treatment process, the Taguchi method was used for four input parameters: pH (2, 7, 12), reaction time (10, 30, 50 min), AG 16 concentrations (20, 120, 220 mg/l) and K2FeO4 concentrations (25, 125, 225 mg/l), for which 9 experiments were performed in accordance with the plan adopted. Test result analysis allowed to indicate the optimal values for individual input parameters (pH 2, time = 50 min, AG 16 = 20 mg/l, K2FeO4 = 125 mg/l). Under these conditions, visual discoloration of wastewater was obtained (AG 16 = 0.4 mg/l, ↓98% ), colour removal (66 mg Pt/l, ↓88%) and DOC (249 mg/l, ↓37%).
    W artykule podjęto próbę oceny przydatności metody Taguchi do optymalizacji procesu oczyszczania syntetycznych ścieków farbiarskich (pH = 6.7-7.2, Conductivity = 6.71-6.84 mS/cm, Salinity = 3581-3648 mg NaCl/dm3, Colour = 560-4710 mg Pt/dm3, COD = 2220-2290 mg O2/dm3, TOC = 394-551 mg/dm3) z zastosowaniem K2FeO4. Badania prowadzono z wykorzystaniem 3 rodzajów ścieków zawierających detergent anionowy (laurylosiarczan sodu, 100 mg/dm3) i różniących się jedynie stężeniem barwnika Acid Green 16 (AG 16). Jako utleniacz zastosowano techniczny K2FeO4, który poddano analizie fizykochemicznej (czystość, widmo UV-VIS, charakterystyka powierzchni i skład chemiczny z zastosowaniem metod SEM i EDX). Do planowania i optymalizacji procesu oczyszczania ścieków zastosowano metodę Taguchi dla czterech parametrów wejściowych: pH (2, 7, 12), czasu reakcji (10, 30, 50 min.), stężenia AG 16 (20, 120, 220 mg/dm3) oraz stężenia K2FeO4 (25, 125, 225 mg/dm3), dla których wykonano 9 eksperymentów zgodnie z przyjętym planem. Analiza wyników badań pozwoliła na wskazanie optymalnych wartości dla poszczególnych parametrów wejściowych (pH 2, czas 50 min., AG 16=20 mg/dm3, K2FeO4 = 125 mg/dm3). W tych warunkach uzyskano wizualne odbarwienie ścieków (AG 16 = 0.4 mg/dm3, ↓98% ), zmniejszenie barwy (66 mg Pt/dm3, ↓88% ) oraz DOC (249 mg/dm3, ↓37%).
    Źródło:
    Fibres & Textiles in Eastern Europe; 2018, 3 (129); 104-109
    1230-3666
    2300-7354
    Pojawia się w:
    Fibres & Textiles in Eastern Europe
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The Dynamics of the Forest Graph Operator
    Autorzy:
    Dara, Suresh
    Hegde, S.M.
    Deva, Venkateshwarlu
    Rao, S.B.
    Zaslavsky, Thomas
    Powiązania:
    https://bibliotekanauki.pl/articles/31340605.pdf
    Data publikacji:
    2016-11-01
    Wydawca:
    Uniwersytet Zielonogórski. Wydział Matematyki, Informatyki i Ekonometrii
    Tematy:
    forest graph operator
    graph dynamics
    Opis:
    In 1966, Cummins introduced the “tree graph”: the tree graph \( \textbf{T} (G) \) of a graph \( G \) (possibly infinite) has all its spanning trees as vertices, and distinct such trees correspond to adjacent vertices if they differ in just one edge, i.e., two spanning trees \( T_1 \) and \( T_2 \) are adjacent if \( T_2 = T_1 − e + f \) for some edges \( e \in T_1 \) and \( f \notin T_1 \). The tree graph of a connected graph need not be connected. To obviate this difficulty we define the “forest graph”: let \( G \) be a labeled graph of order \( \alpha \), finite or infinite, and let \( \mathfrak{N}(G) \) be the set of all labeled maximal forests of \( G \). The forest graph of \( G \), denoted by \( \textbf{F} (G) \), is the graph with vertex set \( \mathfrak{N}(G) \) in which two maximal forests \( F_1 \), \( F_2 \) of \( G \) form an edge if and only if they differ exactly by one edge, i.e., \( F_2 = F_1 − e + f \) for some edges \( e \in F_1 \) and \( f \notin F_1 \). Using the theory of cardinal numbers, Zorn’s lemma, transfinite induction, the axiom of choice and the well-ordering principle, we determine the F-convergence, F-divergence, F-depth and F-stability of any graph \( G \). In particular it is shown that a graph \( G \) (finite or infinite) is F-convergent if and only if \( G \) has at most one cycle of length 3. The F-stable graphs are precisely \( K_3 \) and \( K_1 \). The F-depth of any graph \( G \) different from \( K_3 \) and \( K_1 \) is finite. We also determine various parameters of \( \mathbf{F} (G) \) for an infinite graph \( G \), including the number, order, size, and degree of its components.
    Źródło:
    Discussiones Mathematicae Graph Theory; 2016, 36, 4; 899-913
    2083-5892
    Pojawia się w:
    Discussiones Mathematicae Graph Theory
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Health-related quality of life in oropharyngeal cancer survivors – a population-based study
    Autorzy:
    Guenzel, Thomas
    Walliczek-Dworschak, U
    Teymoortash, A
    Singer, S
    Eichler, M
    Wilhelm, T
    Schimmer, M
    Franzen, A
    Powiązania:
    https://bibliotekanauki.pl/articles/1398253.pdf
    Data publikacji:
    2018
    Wydawca:
    Index Copernicus International
    Tematy:
    EORTC
    oropharynx
    tonsil
    tongue
    cancer
    head and neck
    quality of life
    Opis:
    Objective: The aim of this study was to compare QoL of oropharyngeal cancer survivors who had received different treatments. Subjects and methods: We contacted 954 survivors. Each survivor received the QoL questionnaires EORTC QLQ-C30 and EORTC QLQ-H&N35. Results: A total of 263 survivors completed the questionnaires (28% responses). Forty-five of them had undergone surgery, 20 had received definitive radiotherapy or chemo-radiotherapy, 85 surgery plus adjuvant radiotherapy, and 111 surgery plus adjuvant chemo-radiotherapy. Survivors who had received adjuvant radiotherapy and surgery reported significantly more problems with swallowing (B=13.43 [95% Confidence Interval (CI) 1.83-25.03]), senses (B=24,91 [CI 11.86-37.97]), eating (B=16.91 [CI 3.46-30.36]), dry mouth (B=26.42 [CI 12.17-40.67]), sticky saliva (B=22.37 [CI 6.23-38.50]) and nutritional supplements (B=18.59 [CI 0.62-36.56]) than those who had received surgery only. Survivors who had received adjuvant chemo-radiotherapy and surgery reported significantly many more problems with dry mouth (B=34.15 [CI 18.91-49.39]) and sticky saliva (B=22.90 [CI 5.65-40.16]), and fewer problems with physical functioning (B=-12.07 [CI 0.49-23-64]). Conclusion: Survivors who participated in this survey and who had undergone surgery alone reported in some head- and neck-specific domains a better health-related quality of life than patients who had undergone multi-modal treatment or adjuvant radiotherapy.
    Źródło:
    Polish Journal of Otolaryngology; 2018, 72, 2; 30-35
    0030-6657
    2300-8423
    Pojawia się w:
    Polish Journal of Otolaryngology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Risk Management and First Aid Knowledge of Trekkers in Nepal
    Autorzy:
    Lechner, K.
    Scharfenberg, C.
    Hettlich, E.M.
    Giet, S.
    Morrison, Audry
    Schöffl, Volker
    Küpper, Thomas
    Powiązania:
    https://bibliotekanauki.pl/articles/2098189.pdf
    Data publikacji:
    2020-12-07
    Wydawca:
    Państwowa Wyższa Szkoła Zawodowa w Tarnowie
    Tematy:
    trekking
    alpinizm
    aklimatyzacja
    zarządzanie ryzykiem
    choroba wysokościowa
    mountaineering emergencies
    acute mountain sickness
    acclimatization
    risk management
    Opis:
    Background: Trekking in Nepal is popular and generally safe. However preventable trekking injuries and deaths are often the result of poor risk managementand lack of skills – i.e. acute mountain sickness (AMS) and specific First Aid (FA). Shlim and Gallie’s reviews in 1992 and 2004 of trekking deaths here found a fivefold higher risk for fatal outcomes in organized trekking tours (OT) compared to independently organised trekkers (IT), including preventable deaths (i.e. AMS). Our survey sought to identify the AMS, FA and risk management knowledge/skills of OT and IT whilst trekking in Nepal. Methods: Based on previous pilot studies at the Khumbu region in Nepal, and on risk management information provided by leading German trekking operators, a survey was conducted using two questionnaires: one each for OT and IT.The study site was Manang (3,500m) in Annapurna region, Nepal. All trekkers passing through this site who volunteered their participation were included. For evaluation descriptive statistical methods and non-parametric tests were used. Results: 442 questionnaires were completed (155 OT; 287 IT). Mean agewas 36.4 +/– 12.0y and 61% were male. Mountaineering experience was low and FA training was scarce in both groups. IT (92.7%) followed acclimatization recommendations and 59.2% carried AMS medication, compared respectively to OT at 63.2% and 25.2%. Only 27.1% of OT had repatriation plans for a medical emergency. Conclusions: Most of OT and IT were inexperienced in mountaineering and in mountain emergencies. The preparedness of OT overall was inadequate and over-reliant on the organisers whose skills may also be inadequate when responding to an emergency. Responsible trekking should require that more than one person in a group have adequate, up-to-date riskassessment/management and FA skills specific to the trek, and in particular an understanding of altitude profile, AMS, and individual abilities.
    Źródło:
    Health Promotion & Physical Activity; 2020, 13, 4; 21-24
    2544-9117
    Pojawia się w:
    Health Promotion & Physical Activity
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Applications of recent advances at the Institute of Grassland and Environmental Research in cytogenetics of the Lolium-Festuca complex
    Autorzy:
    Humphreys, M W
    Thomas, H M
    King, I P
    Morgan, W G
    Meredith, M R
    Harper, J A
    Humphreys, M O
    Bettany, A J E
    Dalton, S J
    James, A R
    Ougham, H J
    Thomas, H
    Powiązania:
    https://bibliotekanauki.pl/articles/2046675.pdf
    Data publikacji:
    1997
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    RNA
    in situ
    tissue culture
    gene transfer
    chromosome segment
    anther culture
    androgenesis
    plant breeding
    introgression mapping
    fluorescence
    hybridization
    Lolium-Festuca complex
    drought resistance
    gene isolation
    tetraploid hybrid
    DNA
    meiosis
    grass
    chromosome behaviour
    Opis:
    Recent advances at Institute of Grassland and Environmental Research (Aberystwyth, U.K.) in cytogenetics of the Lolium/Festuca complex places us in the advantageous position of being able to map genes of agronomic importance onto chromosome arms using fluorescence in situ hybridization (FISH). The ability to physically map genes leads to the capability for "dissecting" quantitative traits into their different components and will lead to better understanding of the complex physiological processes involved and the identification of their genetic control. By tagging genes of interest, using molecular and morphological markers, it will be possible to select and combine suites of desirable genes in a single genotype and thus produce novel cultivars by conventional breeding procedures. Programmes for introgression depend on the relationships between species and on levels of chromosome pairing. Phylogenetic relationships within the Lolium/Festuca complex are being determined using both genomic in situ hybridization (GISH) and FISH. With recent advances in genetic manipulation within the Lolium/Festuca complex, opportunities now arise for gene transfer from Lolium and Festuca species into other important agricultural crops.
    Źródło:
    Journal of Applied Genetics; 1997, 38, 3; 273-284
    1234-1983
    Pojawia się w:
    Journal of Applied Genetics
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The need for specific first aid and emergency knowledge whilst trekking in remote areas – results of the ADEMED (Aachen DEntal and MEDical) Expedition to the Annapurna region, Nepal
    Autorzy:
    Scharfenberg, C.
    Lechner, K.
    Giet, S. v.d.
    Hettlich, M.
    Schöffl, V.
    Morrison, A.
    Küpper, Thomas
    Powiązania:
    https://bibliotekanauki.pl/articles/2098229.pdf
    Data publikacji:
    2021-03-08
    Wydawca:
    Państwowa Wyższa Szkoła Zawodowa w Tarnowie
    Tematy:
    trekking
    emergencies
    accidents
    first aid
    training
    Opis:
    Introduction: Fellow trekkers are often the first responders to their comrades in remote settings. Not everyone undertakes First Aid (FA) training when travelling to remote settings away from comprehensive healthcare, whether travelling independently or in a group. The syllabus of standard urbanised FA courses does not fully cover the needs of such trekkers (ie altitude illnesses). We evaluated the FA and emergency knowledge of trekkers en route in the remote Nepalese Himalayas.Material and methods: A questionnaire about FA, trekking emergencies and water hygiene knowledge was completed by a cohort of 453 trekkers passing through Manang (3,519 m), Nepal, who volunteered their participation. A previously validated questionnaire consisted of 20 multiple choice questions (each using a five-point Likert scale) was used, followed by a subjective self-assessment of 17 key topics using a 5-point rating scale from very good to unsatisfactory knowledge. Demographic data including FA and climbing experience was also collected.Results: The participants generally showed a poor knowledge in FA and trekking emergencies, even though 20.8% had some occupational medical training. In total 59.5% of possible answers were answered correctly. On average each participant managed to answer only one out of 20 questions (5.4%) completely correct. The most unsatisfactory results concerned the following topics, each with only 2.4% correct answers: hypothermia/resuscitation, rescue strategies and rip fractures. The best results were for HACE 33.8%, cranio-cerebral injury 33.6%, angina pectoris/heart attack 31.8% and hypovolemic shock 28.7%. The majority of participants had very limited experience of climbing mountains, rock climbing or ice climbing.Conclusions: This study provides essential data identifying deficiencies in standard FA courses that are targeted for urban settings, and not for trekkers in a remote setting far away from comprehensive health care and rescue. There is a need to develop readily accessible FA curriculums specific to trekkers that would provide education on preventative care prior to, during, and after treks, and to improve their knowledge of medical care of trekking injuries and emergencies.
    Źródło:
    Health Promotion & Physical Activity; 2021, 14, 1; 17-24
    2544-9117
    Pojawia się w:
    Health Promotion & Physical Activity
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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