Bibliografías temáticas / TldD

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Literatura académica sobre el tema "TldD"

Autor: Grafiati
Publicado: 28 de junio de 2021
Última modificación: 1 de febrero de 2022

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Artículos de revistas sobre el tema "TldD"

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Allali, Noureddine, Hassan Afif, Martine Couturier y Laurence Van Melderen. "The Highly Conserved TldD and TldE Proteins of Escherichia coli Are Involved in Microcin B17 Processing and in CcdA Degradation". Journal of Bacteriology 184, n.º 12 (15 de junio de 2002): 3224–31. http://dx.doi.org/10.1128/jb.184.12.3224-3231.2002.

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ABSTRACT Microcin B17 (MccB17) is a peptide antibiotic produced by Escherichia coli strains carrying the pMccB17 plasmid. MccB17 is synthesized as a precursor containing an amino-terminal leader peptide that is cleaved during maturation. Maturation requires the product of the chromosomal tldE (pmbA) gene. Mature microcin is exported across the cytoplasmic membrane by a dedicated ABC transporter. In sensitive cells, MccB17 targets the essential topoisomerase II DNA gyrase. Independently, tldE as well as tldD mutants were isolated as being resistant to CcdB, another natural poison of gyrase encoded by the ccd poison-antidote system of plasmid F. This led to the idea that TldD and TldE could regulate gyrase function. We present in vivo evidence supporting the hypothesis that TldD and TldE have proteolytic activity. We show that in bacterial mutants devoid of either TldD or TldE activity, the MccB17 precursor accumulates and is not exported. Similarly, in the ccd system, we found that TldD and TldE are involved in CcdA and CcdA41 antidote degradation rather than being involved in the CcdB resistance mechanism. Interestingly, sequence database comparisons revealed that these two proteins have homologues in eubacteria and archaebacteria, suggesting a broader physiological role.
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Chung, Kwang Hyun, Young Sook Park, Sang Bong Ahn y Byoung Kwan Son. "Radiation protection effect of mobile shield barrier for the medical personnel during endoscopic retrograde cholangiopancreatography: a quasi-experimental prospective study". BMJ Open 9, n.º 3 (marzo de 2019): e027729. http://dx.doi.org/10.1136/bmjopen-2018-027729.

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ObjectiveTo investigate the effectiveness of radiation protection offered by a newly designed mobile shield barrier for medical personnel during endoscopic retrograde cholangiopancreatography (ERCP).DesignQuasi-experimental prospective study.SettingERCP procedures conducted between October 2016 and June 2017 at a single secondary referral hospital that performs approximately 250 therapeutic ERCP procedures annually.InterventionsThe mobile shield barrier was a custom-made 2 mm Pb shielding plate (width: 120 cm, height: 190 cm) with a 0.5 mm Pb window (width: 115 cm, height: 60 cm) on its upper part was used. Four wheels were attached to the bottom to allow easy moving.Primary and secondary outcome measuresThe radiation doses were measured during ERCP using personal thermoluminescence dosimetry (TLD) badges on both sides of the mobile shield barrier (patient’s side: TLD1 and medical staff’s side: TLD2). The radiation doses were also measured on the outer surface of the thyroid shield of the endoscopist (TLD3), and on the chest area inside the protective apron of the endoscopist (TLD4) and the main assistant (TLD5). The TLD was changed and reported once every 3 months. The radiation dose measured by TLD badges were compared.ResultsDuring the study period, a total of 128 ERCP procedures were performed. The mean fluoroscopy time per procedure was 244.9±257.0 s and the mean number of digital radiographs per procedure was 3.7±1.0. TLD1 (outside the barrier) had a mean radiation dose of 26.85±3.47 mSv and all the other TLDs (inside the barrier) had less than 1 mSv (p<0.001). In the post hoc analysis, the difference between TLD1 and others showed a statistical significance; however, there were no significant differences between the TLDs inside the barrier.ConclusionOur mobile shield barrier was useful to reduce the radiation exposure of medical personnel during ERCP.
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Zhang, Xin, Zhengqun Li, Yanxiang Zhao, Xilan Cheng, Yang Liu, Shihong Zhang y Junfeng Liu. "Crystal Structure of a Putative Modulator of Gyrase (TldE) from Thermococcus kodakarensis". Crystals 9, n.º 2 (19 de febrero de 2019): 107. http://dx.doi.org/10.3390/cryst9020107.

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TldD and TldE proteins interact and form a complex to degrade unfolded peptides. The gene Tk0499 from Thermococcus kodakarensis encoded a putative modulator of gyrase (TkTldE). Although TldE genes were common in bacteria and archaea, the structural basis on the evolution of proteins remained largely unknown. Here, the three-dimensional structure of TkTldE was determined by X-ray diffraction. Crystals were acquired by the sitting-drop vapor-diffusion method. X-ray diffraction data from crystals were collected at 2.35 Å. The space group and unit-cell parameters suggested that there were two molecules in the asymmetric unit. Our results showed that TkTldE forms a homodimer, which contained anti-parallel β-strands and a pair of α-helices. Comparison of the structures of TldE and TldD showed that despite their high sequence similarity, TldE lacked the conserved HExxxH and GxC motif in which two His and a Cys residues bound a metal ion. Taken together, these results provided insight into the structural information of this class of TldE/TldD.
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Hu, Yongmei, Nan Peng, Wenyuan Han, Yuxia Mei, Zhengjun Chen, Xu Feng, Yun Xiang Liang y Qunxin She. "An archaeal protein evolutionarily conserved in prokaryotes is a zinc-dependent metalloprotease". Bioscience Reports 32, n.º 6 (15 de octubre de 2012): 609–18. http://dx.doi.org/10.1042/bsr20120074.

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A putative protease gene (tldD) was previously identified from studying tolerance of letD encoding the CcdB toxin of a toxin–antidote system of the F plasmid in Escherichia coli. While this gene is evolutionarily conserved in archaea and bacteria, the proteolytic activity of encoded proteins remained to be demonstrated experimentally. Here we studied Sso0660, an archaeal TldD homologue encoded in Sulfolobus solfataricus by overexpression of the recombinant protein and characterization of the purified enzyme. We found that the enzyme is active in degrading azocasein and FITC–BSA substrates. Protease inhibitor studies showed that EDTA and o-phenanthroline, two well-known metalloprotease inhibitors, either abolished completely or strongly inhibited the enzyme activity, and flame spectrometric analysis showed that a zinc ion is a cofactor of the protease. Furthermore, the protein forms disulfide bond via the Cys416 residue, yielding protein dimer that is the active form of the enzyme. These results establish for the first time that tidD genes encode zinc-containing proteases, classifying them as a family in the metalloprotease class.
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AHARON, D. C., J. HEUKELS y R. F. BUNTSMA. "Orthomanual therapy as treatment for suspected thoracolumbar disc disease in dogs ABSTRACT." Journal of the Hellenic Veterinary Medical Society 66, n.º 1 (27 de diciembre de 2017): 31. http://dx.doi.org/10.12681/jhvms.15581.

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According to the principles of veterinary orthomanual medicine, vertebral misalignments are associated with intervertebral disc disease in dogs. Manual correction of these vertebral misalignments are presumed to contribute to successful recovery. The objective of this retrospective study was to evaluate the effects of veterinary orthomanual therapy (VOT) in 261 dachshunds with suspected thoracolumbar intervertebral disc disease (TLDD). Effect of treatment was assessed using a retrogradeneurological status classification. From one clinic’s 2003-2008 medical records, 261 dachshunds with suspected TLDD met the inclusion criteria. Individual data included signalement and history, orthomanual aspects and neurological evaluations before treatment and at 2 weeks, 3 months and 6 months. Telephone interviews with owners were conducted one year after the initial treatment. The initial neurological status according to Griffiths ‘82 grading, was grade I in 115 animals (44%), grade II in 59 animals (23%), grade III in 27 animals (10%), grade IV in 52 animals (20%) and grade V in 8 animals (3%). Two weeks after the first treatment, 111 animals (55%) with initial grade I, II or III and two animals (3%) with initial grade IV or V had improved from their initial grade to a neurologically normal state; within 6 months of the initial treatment this full recovery was observed in 154 animals (77 %) with initial grade I, II or III and 27 animals (45%) with initial grade IV or V. Of the initially non-ambulatory dogs, 82% recovered to an ambulatory state. Of the owners, 89% evaluated the treatment as successful after 1 year. Most (78%) of the animals underwent a single VOT treatment, and the most commonly misaligned vertebrae were T12, T13 and L1. Veterinary orthomanual therapy is a conservative treatment method, which is minimally stressful for the animal and inexpensive. VOT combined with cage rest seems to be effective in treating TLDD in dachshunds. The results of this study demonstrate that veterinary orthomanual therapy might be considered an adjunct modality for the non-surgical treatment of dachshunds with intervertebral disc disease. A prospective controlled clinical trial is needed to further examine its efficacy.
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Ghilarov, Dmitry, Marina Serebryakova, Clare E. M. Stevenson, Stephen J. Hearnshaw, Dmitry S. Volkov, Anthony Maxwell, David M. Lawson y Konstantin Severinov. "The Origins of Specificity in the Microcin-Processing Protease TldD/E". Structure 25, n.º 10 (octubre de 2017): 1549–61. http://dx.doi.org/10.1016/j.str.2017.08.006.

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Hölscher, Tina y Helmut Görisch. "Knockout and Overexpression of Pyrroloquinoline Quinone Biosynthetic Genes in Gluconobacter oxydans 621H". Journal of Bacteriology 188, n.º 21 (25 de agosto de 2006): 7668–76. http://dx.doi.org/10.1128/jb.01009-06.

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ABSTRACT In Gluconobacter oxydans, pyrroloquinoline quinone (PQQ) serves as the cofactor for various membrane-bound dehydrogenases that oxidize sugars and alcohols in the periplasm. Proteins for the biosynthesis of PQQ are encoded by the pqqABCDE gene cluster. Our reverse transcription-PCR and promoter analysis data indicated that the pqqA promoter represents the only promoter within the pqqABCDE cluster of G. oxydans 621H. PQQ overproduction in G. oxydans was achieved by transformation with the plasmid-carried pqqA gene or the complete pqqABCDE cluster. A G. oxydans mutant unable to produce PQQ was obtained by site-directed disruption of the pqqA gene. In contrast to the wild-type strain, the pqqA mutant did not grow with d-mannitol, d-glucose, or glycerol as the sole energy source, showing that in G. oxydans 621H, PQQ is essential for growth with these substrates. Growth of the pqqA mutant, however, was found with d-gluconate as the energy source. The growth behavior of the pqqA mutant correlated with the presence or absence of the respective PQQ-dependent membrane-bound dehydrogenase activities, demonstrating the vital role of these enzymes in G. oxydans metabolism. A different PQQ-deficient mutant was generated by Tn5 transposon mutagenesis. This mutant showed a defect in a gene with high homology to the Escherichia coli tldD gene, which encodes a peptidase. Our results indicate that the tldD gene in G. oxydans 621H is involved in PQQ biosynthesis, possibly with a similar function to that of the pqqF genes found in other PQQ-synthesizing bacteria.
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Vobruba, Simon, Zdenek Kamenik, Stanislav Kadlcik y Jiri Janata. "N-Deacetylation in Lincosamide Biosynthesis Is Catalyzed by a TldD/PmbA Family Protein". ACS Chemical Biology 15, n.º 8 (6 de agosto de 2020): 2048–54. http://dx.doi.org/10.1021/acschembio.0c00224.

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Vorland, Colby, Michelle Bohan Brown, Michelle Cardel y Andrew Brown. "Traffic Light Diets Per Se Have Limited Evidence for Effectiveness on Childhood Obesity: A Review". Current Developments in Nutrition 4, Supplement_2 (29 de mayo de 2020): 1697. http://dx.doi.org/10.1093/cdn/nzaa063_095.

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Abstract Objectives The “traffic light diet” (TLD; or “stop light diet” among other names) categorizes foods into ‘green’, ‘yellow’, or ‘red’ groups to consume without restriction, in moderation, or minimally, respectively. It is often a component of childhood interventions targeting weight-related outcomes. The Academy of Nutrition and Dietetics Evidence Analysis Library assigned TLDs Grade I evidence in 2006 for pediatric weight management, but none of the studies reviewed tested the TLD in isolation. We conducted a review of the effect of TLDs on obesity-related outcomes in children and definitions among different implementations of TLDs. Methods We searched PubMed up to September 2019 for interventions using the TLD with obesity-related anthropometric outcomes. Studies were screened in duplicate, and treatment characteristics extracted. Additional studies were identified by screening references. Using a convenience sample of texts from the original TLD creators, Indiana University vending, a new pediatric weight loss app, and an online resource, we assessed how definitions of TLDs compare. Results Our search identified 386 abstracts, 5 of which were interventions that included the TLD and weight-related outcomes. Three of these were randomized controlled trials, and none studied the TLD in isolation outside of multicomponent interventions. We then focused on 4 foundational TLD articles that were repeatedly cited. One of these isolated the TLD from the multicomponent intervention but found no statistical effect of the diet or interaction of diet with other factors for weight-related outcomes. In the sample of TLD implementations, substantial differences were apparent in how foods were classified among green, yellow, and red groups, such as avocados, nuts, figs/fig cookies, and peanut butter. Conclusions There is insufficient evidence supporting TLDs as a unique, isolatable factor in improving weight-related outcomes in children. This does not necessarily mean that TLDs are ineffective, as they have been incorporated into successful interventions. A standardization of TLD definitions (consistently categorizing foods and whether the term ‘TLD’ is meant to include other components of an intensive lifestyle intervention) is needed to make comparisons of effectiveness going forward. Funding Sources The authors received no funding for this specific work.
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Rahman, M. Obaidur, Md Ashraful Hoque, Md Shakilur Rahman y Afia Begum. "Responses of LiF Thermoluminescence Dosimeters to Diagnostic 60Co Teletherapy Beams". Bangladesh Journal of Medical Physics 8, n.º 1 (10 de septiembre de 2017): 14–21. http://dx.doi.org/10.3329/bjmp.v8i1.33930.

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Thermoluminescence Dosimeter (TLD) is used as an ionizing radiation detector in the field of clinical radiotherapy, diagnostic radiology, personal radiation monitoring as well as in environmental radiation dosimetry. The sensitivity of all the TLDs is not the same even though the manufacturer produced them in the same batch. The response of TLD at various doses is also not always linear. In the present study fifty-seven rod shaped LiF TLDs had been irradiated by doses of 50cGy, 100cGy, 150cGy and 200cGy using 60Co teletherapy unit of Dhaka Medical College (Alcyon II, CGR, McV, France). The TLDs were placed in the grooves of a slab phantom and then covered by a 0.5cm thick plexiglass sheet. The phantom was then irradiated in the reference condition (10x10cm2 field size, 80cm SSD). After irradiation, readout of TLDs was done using a Harshaw TLD reader (Model 3500). Measurements were performed three times for each dose value and their average was taken. For convenience all fifty-seven TLDs were divided into nineteen groups. Grouping was done according to the response of the TLDs for a fixed dose value. In a particular group of TLDs, variation of the response of the dosimeters is the smallest one. The dose (cGy) – response (nC) linearity curve of TLDs for each of the nineteen groups showed to be very close to unity.Bangladesh Journal of Medical Physics Vol.8 No.1 2015 14-21
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Más fuentes

Tesis sobre el tema "TldD"

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Allali, Nourredine. "Analyse du rôle des gènes chromosomiques tldD et tldE dans le système poison/antidote ccd et dans la maturation de la microcine B17". Doctoral thesis, Universite Libre de Bruxelles, 2002. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211343.

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Cavalieri, Tássio Antonio. "Emprego do MCNP no estudo dos TLDs 600 e 700 visando a implementação da caracterização do feixe de irradiação na instalação de BNCT do IEA-R1". Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/85/85133/tde-19112013-135350/.

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A Terapia de Captura de Nêutron por Boro (BNCT) é uma terapia de combate ao câncer bimodal, na qual a energia útil da terapia vem da reação nuclear que ocorre pelo Boro quando irradiado com nêutrons térmicos. No IPEN há uma instalação de pesquisas em BNCT, na qual o feixe de radiação contendo nêutrons é proveniente do reator IEA-R1. Como condição desta terapia é necessário realizar a dosimetria do feixe de radiação, que atualmente é feito com o uso de folhas de ativação, para cálculo do fluxo de nêutrons, e do dosímetro TLD 400, para estimativa da dose gama. Para campos mistos de nêutrons e gamas, a Comissão Internacional de Unidades e Medidas (ICRU) recomenda o uso de dosímetros com sensibilidades distintas para as componentes do feixe, como o caso do par TLD 600 e TLD 700 que apresentam sensibilidades distintas a nêutrons térmicos, devido à diferente quantidade do isótopo 6Li em sua composição, o qual apresenta uma alta seção de choque para nêutrons térmicos. Este trabalho constou da realização de simulações e experimentos visando a implementação da metodologia de dosimetria utilizando o par TLD 600 e TLD 700 e sua comparação com a metodologia atualmente utilizada pelo grupo de pesquisa em BNCT, que utiliza o TLD 400. Portanto, foi realizado um estudo das respostas de cada um destes TLDs a partir de irradiações em diferentes campos e sempre utilizando simulações com o MCNP para fornecer a discriminalização das componentes de dose depositadas em cada TLD. Foram realizadas varias irradiações em campo de gama puro e em campo misto de nêutrons e gamas para o estudo da reprodutibilidade destes TLDs. Este estudo mostrou que mesmo TLDs do mesmo tipo têm sensibilidades distintas, e assim foi criado um Fator de Normalização para cada um dos TLDs, eliminando assim a necessidade de selecionamento. Foi realizado um estudo sobre a diferença das respostas destes TLDs devido à diferentes campos. Este estudo mostrou ser possível estimar o fluxo relativo entre gamas e nêutrons a partir da relação existente entre as duas regiões de interesse dos TLDs 600 e 700. Também foi possível observar que o TLD 700 apresenta resposta para nêutrons, e se a recomendação da ICRU for seguida, a resposta devido à radiação gama será superestimada. Foram obtidas as curvas de calibração dose resposta destes TLDs para campos de gamas puro e campos mistos. Este trabalho propõe o uso desta metodologia com o uso do par TLD 600 e TLD 700, por apresentar maior precisão de resposta frente a atual metodologia que utiliza o TLD 400, porém precauções devem ser tomadas para evitar que a dose gama seja superestimada.
Boron Neutron Capture Therapy, BNCT, is a bimodal radiotherapic procedure for cancer treatment. Its usefull energy comes from a nuclear reaction driven by impinging thermal neutron upon Boron 10 atoms. A BNCT research facility has been constructed in IPEN at the IEA-R1 reactor, to develop studies in this area. One of its prime experimental parameter is the beam dosimetry which is nowadays made by using activation foils, for neutron measurements, and TLD 400, for gamma dosimetry. For mixed field dosimetry, the International Commmission on Radiation Units and Measuments, ICRU, recommends the use of pair of detectors with distinct responses to the field components. The TLD 600/ TLD 700 pair meets this criteria, as the amount of 6Li, a nuclide with high thermal neutron cross section, greatily differs in their composition. This work presents a series of experiments and simulations performed in order to implement the mixed field dosimetry based on the use of TLD 600/TLD 700 pair. It also intended to compare this mixed field dosimetric methodology to the one so far used by the BNCT research group of IPEN. The response of all TLDs were studied under irradiations in different irradiation fields and simulations, underwent by MCNP, were run in order to evaluate the dose contribution from each field component. Series of repeated irradiations under pure gamma field and mixed field neutron/gamma field showed differences in the TLD individual responses which led to the adoption of a Normalization Factor. From the use of Normalization Factor the TLD selection it has allowed to overcome TLD selection. TLD responses due to different field components and spectra were studied. It has shown to be possible to evaluate the ralative gamma/neutron fluxes from the relative responses observed in the two Regions of Interest of TLDs glow curves, ROIs, from TLD 600 and TLD 700. It has also been possible to observe the TLD 700 response to neutron, which leads to a gamma dose overstimation when one follows the ICRU recommended mixed field dosimetric procedure. Dose response curves were obtained for the distinct types of TLDs for pure gamma and mixed fields. This work recommends the TLD 600/TLD 700 pair methodology for mixed field dosimetry, this methodology presents a better precision than the one based on TLD 400, however one has to be carefull to avoid gamma dose superestimation.
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Wang, Andrew Jen. "TONGS: TLDR; Opinion Network Guide System". DigitalCommons@CalPoly, 2017. https://digitalcommons.calpoly.edu/theses/1798.

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In the modern world, huge amounts of text are being generated every minute. For example, Twitter users post their current emotions in tweets, while Facebook users vent about their experience in posts. In just one minute, Twitter users upload 350,000 tweets, and Facebook users post anywhere from 2.5 million to 3 million posts. To keep up with this growth in data, almost all of this information goes through automated text processing. To extract features such as the opinion and subjectivity in text, sentiment analysis is applied to the corpus. In this thesis, we present the TONGS library for conducting sentiment analysis. TONGS uses Word2Vec within the TensorFlow library to convert words into vector space representations. The TONGS library contains four different methods built upon previous research in sentiment analysis and Word2Vec. We further experiment and analyze these methods using the IMDB dataset. Finally, we introduce and test a new sentiment dataset from government hearings obtained through Digital Democracy, challenging the accuracy of the TONGS library in an unknown topic.
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Novo, Tiago António Gadim. "Melhoramento da resposta sísmica de edifícios com recurso a TLDs". Master's thesis, Universidade de Aveiro, 2008. http://hdl.handle.net/10773/2335.

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Mestrado em Engenharia Civil
Sismos ocorridos recentemente têm demonstrado, de forma dramática, que a investigação na área da engenharia sísmica deve ser direccionada para a avaliação da vulnerabilidade das construções, geralmente desprovidas de adequadas características resistentes. O seu esforço deve ser realizado reduzindo a sua vulnerabilidade e, consequentemente, o risco para níveis aceitáveis. O estudo e desenvolvimento de novas técnicas e de materiais de reforço têm um papel fundamental no sentido de evitar perdas económicas e vidas humanas. O trabalho desenvolvido nesta dissertação de mestrado centra-se no estudo de um sistema de protecção sísmica de edifícios, Tuned Liquid Damperes(TLDs), que reduzem as vibrações induzidas pelas acções dinâmicas através de fenómenos de oscilação da superfície livre do fluido (sloshing). Este trabalho foi estruturado em duas partes. Na primeira, estudou-se o comportamento de um Tuned Liquid Damper (TLD) isolado quando sujeito a uma excitação sinusoidal na sua base, com diferentes amplitudes de deslocamento. Na segunda parte deste trabalho avaliou-se a eficiência dos TLDs na melhoria da resposta sísmica de um edifício, com base em análises dinâmicas lineares. O edifício estudado é representativo da arquitectura moderna, localizado em Lisboa. ABSTRACT: Recent earthquakes have dramatically revealed that research in the area of earthquake engineering should be directed towards the evaluation of construction vulnerabilities, which are generally devoid of adequate resistance characteristics. Its reinforcement should be made with a view to reducing its vulnerabilities and consequently, the risk to acceptable levels. The study and development of new reinforcement techniques and/or the improvement of seismic performance is fundamental so as to avoid significant economic losses as well as human lives in future events. The work done in this Master's dissertation is centered on the study of an earthquake protection system, the Tuned Liquid Dampers (TLDs), which can reduce the motions induced by the earthquake's effect on buildings, taking into account the oscillation of the fluid free surface (sloshing). This work was divided into two parts. In the first part, the behavior of an isolated Tuned Liquid Damper (TLD), subjected to a sinusoidal excitation at its base, with different displacement amplitudes was studied. In the second part of this work, the efficiency of the TLDs in improving the seismic response of an existing building was evaluated based on linear dynamic analyses. The building in the study is representative of modern architecture and located in Lisbon.
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Paiva, Fabio de. "Estudo das respostas de TLD tipo LiF para caracterização de campos mistos". Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/85/85133/tde-18102016-105401/.

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A Terapia por Captura de Nêutrons, NCT (Neutron Capture Therapy) é uma técnica radioterápica em que a energia útil do tratamento vem da energia liberada em uma reação nuclear e não do feixe primário, como comumente utilizado em outros procedimentos radioterápicos. O Boro, por constituir-se em um elemento de baixa toxicidade e por apresentar um isótopo (10B) com alta seção de choque para a reação 10B(n,α)7Li tem sido o elemento mais utilizado nas pesquisas que visam o aprimoramento e a promoção desta técnica, derivando daí o termo BNCT (Boron Neutron Capture Therapy). Para fins de pesquisa em BNCT foi construída ao longo de um dos extratores de feixes (BH - Beam Hole) do reator IEA-R1 uma instalação, onde filtros e moderadores são posicionados entre o núcleo do reator e a posição de irradiação com o objetivo de modular o feixe de irradiação, otimizando a componente útil do feixe, os nêutrons térmicos, e reduzindo os contaminantes, raios gama e nêutrons em outras faixas energéticas. Tem-se realizado estudos visando a implementação de melhorias na caracterização e otimização do feixe obtido nesse arranjo instalado no BH-3. Atualmente a monitoração dos nêutrons é feita através de folhas de ativação, e a componente gama pelo TLD-400. Uma nova metodologia de monitoração tem sido estudada pelo grupo. A referida técnica consiste em usar TLDs de tipos diferentes, ou seja, que possuam sensibilidades distintas aos nêutrons térmicos, em virtude de diferenças na concentração dos isótopos de Lítio. No estudo dessa nova metodologia têm sido usados os TLD-600 e TLD-700. Este trabalho propõe uma metodologia usando o par TLD-100 e TLD-700. Inicialmente foi verificada a reprodutibilidade das respostas dos TLDs 700, 400 e 100 frente a campos gama puro e campos mistos, gama e nêutron. Campos estes obtidos em arranjos usando fontes de 60Co e 241AmBe. A partir de simulações usando o VI MCNP5 foi projetado e construído um Irradiador de campos mistos, que permitiu expor os dosímetros em campos mistos com diferentes espectros energéticos. As condições criadas no irradiador permitiram verificar, como a resposta do TLD é modificada pelas mudanças no espectro energético de um campo misto gama e nêutrons de baixo fluxo. O irradiador de campo misto permitiu condições para estabelecer uma relação entre o formato da curva termoluminescente e a composição do campo misto. A relação estabelecida relaciona o fluxo relativo e a razão entre a resposta das duas regiões de interesse dos TLDs 700 e 100. A partir de campos mistos com condições controladas, esse trabalho permitiu verificar a viabilidade do uso do par de TLD-100 e TLD-700 para monitoração de nêutrons térmicos na instalação de BNCT.
Neutron Capture Therapy (NCT), is a radiotherapy technique in which the useful treatment energy comes from the energy released in a nuclear reaction and not from the primary beam, as commonly used in other radiotherapc procedures. Boron, an element of low toxicity presents an isotope (10B) with high cross-section for the (n, α) reaction and therefore has been the element mostly used in research aimed at the improvement and promotion of this technique, deriving hence the term BNCT (Boron Neutron Capture Therapy). For BNCT research purposes, a facility was built along one of radiation extractors of the IEA-R1 reactor. In this facility filters and moderators are positioned between the reactor core and the irradiation position aiming to modulate the irradiation beam by optimizing the useful component of the beam, thermal neutrons, and reducing its contaminants, gamma rays and neutrons in higher energy bands. We have conducted studies aimed at implementing improvements in the characterization of and optimization of the beam. Currently, neutron flux monitorion is done through activation foils, and the gamma component by TLD-400. A new methodology has been studied by the group. The technique consists in using different types of TLD, having different sensitivities to thermal neutrons due to differences in the concentration of lithium isotopes. In the study of this new methodology TLD 600 and TLD-700 have been used. This work presents a series of studies in order to apply a methodology using the TLD-100 and TLD-700 pair. TLDs 700, 400 and 100 responses pure gamma and mixed irradiation fields, obtained in arrangements using a 60Co and AmBe sources, were evaluaterd. MCNP simulations were run in order to both discriminating the radiation components and designing one mixed fields irradiator, which allowed exposing dosimeters in mixed fields with different energy spectra. The conditions created in the irradiator allowed to verify, as the TLD response is modified by changes in the energy spectrum of a mixed gamma neutron fields. VIII This irradiator provided irradiation conditions so to establish a relationship between the shape of the LiF glow curves and the composition of the mixed field. This work has shown the feasibility of using the TLD-100 and TLD-700 pair for gamma and thermal neutrons monitoration in the BNCT facility.
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Junior, Valdeci Carneiro. "Caracterização do campo de nêutrons na instalação para estudo em BNCT no Reator IEA-R1". Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/85/85133/tde-01092009-172117/.

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Este trabalho tem como objetivo realizar a caracterização do campo de nêutrons e radiação gama na posição de irradiação de amostras em uma instalação para pesquisas em Terapia por Captura de Nêutrons em Boro (BNCT) no IPEN, junto ao reator IEA-R1. A técnica de BNCT vem sendo estudada como uma opção seletiva e segura de tratamento para tumores cancerígenos resistentes ou considerados não tratáveis pelas técnicas convencionais, por exemplo, o Glioblastoma Multiforme - tumor cancerígeno no cérebro. Foram realizadas medições de fluxos de nêutrons térmicos, epitérmicos e rápidos bem como das doses devido a nêutrons, e radiação gama na posição de amostra, utilizando-se detectores de ativação tipo folha e dosímetros termoluminescente. Para determinação da intensidade e do espectro de energia de nêutrons, foi utilizado um conjunto de folhas de ativação de energias limiares distintas, irradiadas na instalação e analisadas com um detetor semicondutor de Germânio hiper puro acoplado a um sistema eletrônico adequado para espectrometria gama e os resultados processados com o código SAND-BP. As doses devidas a radiação gama e nêutrons foram determinadas utilizando dosímetros termoluminescentes: TLD-400 (sensível a gama); TLD-600 (sensível a nêutrons) e TLD-700 (sensível a gama). Os TLDs foram selecionados e usados para a obtenção das curvas de calibração - resposta do dosímetro versus dose - de cada uma dos três tipos de TLD, as quais foram utilizadas para calcular as doses devidas a nêutrons e gama na posição de amostra. O campo de radiação na posição de irradiação de amostra foi caracterizado fluxo para nêutrons térmicos de 1.39.108 ± 0,12.108 n/cm2s a dose devido a nêutrons térmicos é três vezes maior que as devido a radiação gama, essas medidas comprovam a reprodutibilidade e consistência dos resultados experimentais obtidos. Considerando os resultados obtidos, verificou-se que o campo de nêutrons e radiação gama atende para pesquisa em BNCT. NEUTRON
This work aims to characterize the mixed neutron and gamma field, in the sample irradiation position, in a research installation for Boron Neutron Capture Therapy (BNCT), in the IPEN IEA-R1 reactor. The BNCT technique has been studied as a safe and selective option in the treatment of resistant cancerigenous tumors or considered non-curable by the conventional techniques, for example, the Glioblastoma Multiform a brain cancerigenous tumor. Neutron flux measurements were carried out: thermal, ressonance and fast, as well as neutron and gamma rays doses, in the sample position, using activation foils detectors and thermoluminescent dosimeters. For the determination of the neutron spectrum and intensity, a set of different threshold activation foils and gold foils covered and uncovered with cadmium irradiated in the installation was used, analyzed by a high Pure Germanium semiconductor detector, coupled to an electronic system suitable for gamma spectrometry. The results were processed with the SAND-BP code. The doses due to gamma and neutron rays were determined using thermoluminescent dosimeters TLD 400 and TLD 700 sensitive to gamma and TLD 600, sensitive to neutrons. The TLDs were selected and used for obtaining the calibration curves dosimeter answer versus dose from each of the TLD three types, which were necessary to calculate the doses due to neutron and gamma, in the sample position. The radiation field, in the sample irradiation position, was characterized flux for thermal neutrons of 1.39.108 ± 0,12.108 n/cm2s the doses due to thermal neutrons are three times higher than those due to gamma radiation and confirm the reproducibility and consistency of the experimental findings obtained. Considering these results, the neutron field and gamma radiation showed to be appropriated for research in BNCT
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Amoush, Ahmad A. "Error Analysis of non-TLD HDR Brachytherapy Dosimetric Techniques". University of Cincinnati / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1307105202.

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Joly-Tonetti, Nicolas. "Etude du rôle des microARN dans la réponse à l'irradiation ionisante et au cours de la différenciation des kératinocytes humains primaires". Thesis, Lyon 1, 2012. http://www.theses.fr/2012LYO10204/document.

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Les microARN sont des petits ARN (22 nucléotides en moyenne) non codants connus pour réguler l'expression des gènes au niveau post-transcriptionnel. Ils jouent un rôle dans de nombreux processus cellulaires, notamment dans la peau. La nature et la fonction précise des microRNAs contrôlant la différenciation épidermique restent à clarifier. De même; leur rôle dans la réponse à l'irradiation ionisante du kératinocyte n'a jamais été étudié. Nous avons donc entrepris une analyse d'expression du miRnome par la technique de TLDA dans ces deux contexts. Pour la différentiation épidermique, ces travaux de thèse ont permis de mettre en évidence une induction globale de l'expression des microARN au cours de la différentiation précoce des kératinocytes. Plusieurs microARN significativement modulés ont été caractérisés. Parmi eux, MiR-132 a été validé in vivo sur coupe de peau. Au cours des étapes tardives de la différentiation, miR-23b est induit. Nous avons montré qu'il agit en régulant TGIF1, répresseur de la voie TGF-β et active la phosphorylation de SMAD2, facteur de transcription nécesssaire à la différenciation terminale. Nous avonss également observé que les microARN répondent de façon globale aux rayons γ, mais que la nature de cette réponse dépend de l'état de différenciation des cellules. Cette réponse globale n'est pas corrélée à des modifications d'expression de protéine de la voie de synthèse des microRNAs comme AGO2 et DICERI. Nous avons montré que, dans les cellules proliférantes, l'induction de micro ARN réprimés par les rayons γ affecte la viabilité des cellules après irradiation. Ainsi, ces travaux de thèse contribuent à une meilleure compréhnesion du rôle des microRNA dans la régulation de la différenciation épidermique et la réponse des kératinocytes au stress génotoxique
MicroRNA are small non-coding RNA (22 nucleotides in mean) known to regulate gene expression at the post-translational level. They play a role in many cellular processes, especially in skin. However, their exact role during epidermal differenciation remains to be clarified. Moreover, their role in the response of keratinocytes to ionizing irradiation has never been studied. Therefore, we settled up a miRnome expression analysis by TDLA technique in both situations. In epidermis differenciation, we observed a global induction of microRNA expression during the early steps of keratinocytes differenciation. Several significantly modulated microRNA have been characterized. Among them, miR-132 was validated in vivo on skin sections. During the late steps of differentiation, miR-23b is induced. We showed that miR-23b is able to regulate TGIF1, repressor of TGF-β pathway and to induce SMAD2 phosphorylation, a key transcription factor in terminal differentiation. In keratinocytes exposed to ionizing irradiation, we observed that microRNA display a global response to γ-rays that is higly dependent to the differentiation state of irradiated cells. This global response is not correleted to expression modifications of proteins from the microRNA synthesis pathway such as AGO2 and DICERI. We finally found that in proliferative keratinocytes the induction of irradiation-repressed microRNA impact cell viability after irradiation. Taken together, those results contribute to a better understanding of the microRNA function in the regulation of epidermal differentiation and in the response of keratinocytes to genotoxic stress
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Muniz, Rafael Oliveira Rondon. "Desenvolvimento de um simulador antropomórfico para simulação e medidas de dose e fluxo de nêutrons na instalação para estudos em BNCT". Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/85/85133/tde-15082011-082735/.

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A instalação do IPEN para pesquisas em BNCT (Terapia por Captura de Nêutrons em Boro) utiliza o canal de irradiação número 3 do reator IEA-R1, no qual tem-se um campo misto de radiação nêutrons e gama. As pesquisas em andamento necessitam que o campo de radiação, na posição de irradiação de amostra, tenha na composição os nêutrons térmicos maximizados e os componentes de nêutrons epitérmicos, rápidos e radiação gama minimizados. Este trabalho foi desenvolvido com o objetivo de avaliar se o campo de radiação atual na instalação é adequado aos trabalhos em BNCT. Para cumprir com este objetivo, uma metodologia para dosimetria de nêutrons térmicos e radiação gama em campos mistos de altas doses, que não era disponível no IPEN, foi implantada no Centro de Engenharia Nuclear do IPEN, utilizando dosímetros termoluminescentes TLDs 400, 600 e 700. Para as medidas de fluxo de nêutrons térmicos e epitérmicos foram utilizados detetores de ativação de ouro aplicando a técnica de razão de cádmio. Um simulador antropomórfico cilíndrico composto de discos de acrílico foi desenvolvido e testado na instalação e para obter valores teóricos do fluxo de nêutrons e a dose ao longo do simulador antropomórfico foi utilizado o código computacional DOT 3.5. Na posição correspondente a aproximadamente metade do comprimento do cilindro do simulador antropomórfico, foram obtidos os seguintes valores: fluxo de nêutrons térmicos (2,52 ± 0,06).108n/cm2s, epitérmicos (6,17 ± 0,26).107n/cm2s, dose absorvida devido a nêutrons térmicos de (4,2 ± 1,8)Gy e devido a radiação gama (10,1 ± 1,3)Gy. Os valores obtidos mostram que os fluxos de nêutrons térmicos e epitérmicos são adequados para os estudos em BNCT, porém, a dose devido a radiação gama está elevada, indicando que a instalação deve ser aprimorada.
IPEN facility for researches in BNCT (Boron Neutron Capture Therapy) uses IEA-R1 reactor\'s irradiation channel number 3, where there is a mixed radiation field neutrons and gamma. The researches in progress require the radiation fields, in the position of the irradiation of sample, to have in its composition maximized thermal neutrons component and minimized, fast and epithermal neutron flux and gamma radiation. This work was developed with the objective of evaluating whether the present radiation field in the facility is suitable for BNCT researches. In order to achieve this objective, a methodology for the dosimetry of thermal neutrons and gamma radiation in mixed fields of high doses, which was not available in IPEN, was implemented in the Center of Nuclear Engineering of IPEN, by using thermoluminescent dosimeters TLDs 400, 600 and 700. For the measurements of thermal and epithermal neutron flux, activation detectors of gold were used applying the cadmium ratio technique. A cylindrical phantom composed by acrylic discs was developed and tested in the facility and the DOT 3.5. computational code was used in order to obtain theoretical values of neutron flux and the dose along phantom. In the position corresponding to about half the length of the cylinder of the phantom, the following values were obtained: thermal neutron flux (2,52 ± 0,06).108n/cm2s, epithermal neutron flux (6,17 ± 0,26).107.106n/cm2s, absorbed dose due to thermal neutrons (4,2 ± 1,8)Gy and (10,1 ± 1,3)Gy due to gamma radiation. The obtained values show that the fluxes of thermal and epithermal neutrons flux are appropriate for studies in BNCT, however, the dose due to gamma radiation is high, indicating that the facility should be improved.
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CHOKKALINGAM, BALACHANDER. "Evaluation of TLD/Predator algorithm : Evaluation of TLD(aka Predator) algorithm used for real-time tracking of unknownobjects in a video stream from eye tracking perspective". Thesis, KTH, Skolan för datavetenskap och kommunikation (CSC), 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-142017.

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Abstract TLD is an award-winning, real-time algorithm for long-term tracking of unknown objects in video streams. The object of interest is defined by a bounding box in a single frame. TLD simultaneously tracks the object, Learns its appearance and Detects it whenever it appears in the video. The result is a real-time tracking that typically improves over time. Long-term tracking of arbitrary objects is a the core problem in many computer vision applications: surveillance, object auto-focus, SLAM, games, HCI, video annotation etc. The following work is done: 1. The OpenTLD algorithm is extended for Multi-Object Tracking. 2. The OpenTLD algorithm is evaluated (i.e. problems with the algorithm, usability of the algorithm), specially from Eye tracking perspective. 3. The OpenTLD algorithm is compared with other tracking algorithm e.g. Mean shift in OpenCV in terms of tracking performance. 4. Some enhancements to the OpenTLD algorithm are made.
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Libros sobre el tema "TldD"

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Staub, Hermann, Robert Fischer, Peter Ulmer, Dieter Brügemann y Claus-Wilhelm Canaris, eds. Handelsgesetzbuch, Band 3, Tlbd 1: §§ 238-289. Tlbd 2: §§ 290-342a. Berlin, Boston: DE GRUYTER, 2002. http://dx.doi.org/10.1515/9783110871272.

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Nemiro, E. A. Regionalʹnai͡a︡ sistema individualʹnogo dozimetricheskogo kontroli͡a︡ na osnove TLD. Moskva: Ėnergoatomizdat, 1987.

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Steinmann, Henrik. Das Tierreich / The Animal Kingdom, Tlbd/Part 111, World Catalogue of Odonata II. Editado por Heinz Wermuth y Maximilian Fischer. Berlin, Boston: DE GRUYTER, 1997. http://dx.doi.org/10.1515/9783110824445.

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ACM SIGPLAN International Workshop on Types in Languages Design and Implementation (2nd 2005 Long Beach, Calif.). Proceedings of the TLDI '05: 2005 ACM SIGPLAN International Workshop on Types in Languages Design and Implementation : papers presented at the workshop : Long Beach, California, USA January 10th, 2005. New York: Association for Computing Machinery, 2005.

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ACM SIGPLAN Special Interest Group on Programming Languages., ed. Proceedings of the TLDI '03: 2003 ACM SIGPLAN International Workshop on Types in Languages Design And Implementation : papers presented at the workshop, New Orleans, Louisiana, USA January 18th, 2003. New York: Association for Computing Machinery, 2003.

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ACM Special Interest Group on Programming Languages., ed. Proceedings of the TLDI 2007: 2007 ACM SIGPLAN International Workshop on Types in Languages Design and Implementation : papers presented at the workshop, January 16, 2007, French Riviera, Nice, France, co-located with POPL 2007. New York: Association for Computing Machinery, 2007.

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Wölfel, Bettina, Ingrid Niedersteberg, Hans Walter Niedersteberg y Lothar Borringo. Rechtschreibkurs, Sonderschule, neue Rechtschreibung, Tl.D. Cornelsen, 1997.

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Greatest Story Evr Tld Hml. Riversong Records, 1996.

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Das Alte Testament Deutsch (ATD), Tlbd.10, Die Samuelbücher. Vandenhoeck & Ruprecht, 1986.

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Weiser, Artur. Das Alte Testament Deutsch (ATD), Tlbd.14, Die Psalmen. Vandenhoeck & Ruprecht, 1987.

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Capítulos de libros sobre el tema "TldD"

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Robert, Yves, Sameer Shende, Allen D. Malony, Alan Morris, Wyatt Spear, Scott Biersdorff, Burton Smith et al. "Thread-Level Data Speculation (TLDS)". En Encyclopedia of Parallel Computing, 2040. Boston, MA: Springer US, 2011. http://dx.doi.org/10.1007/978-0-387-09766-4_2237.

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Adamo, Francesco, Pierluigi Carcagnì, Pier Luigi Mazzeo, Cosimo Distante y Paolo Spagnolo. "TLD and Struck: A Feature Descriptors Comparative Study". En Activity Monitoring by Multiple Distributed Sensing, 52–63. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-13323-2_5.

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Zhang, Chongyang, Kaichang Di, Zhaoqin Liu y Wenhui Wan. "TLD Based Visual Target Tracking for Planetary Rover Exploration". En Communications in Computer and Information Science, 29–35. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-37149-3_4.

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Kinhikar, Rajesh A., Chandrshekhar M. Tambe, Dipak S. Dhote y Deepak D. Deshpande. "In vivo dosimetry using MOSFET and TLD for Tomotherapy". En IFMBE Proceedings, 114–16. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-03474-9_33.

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Colucci, Francesca, Marco Claudio De Simone y Domenico Guida. "TLD Design and Development for Vibration Mitigation in Structures". En New Technologies, Development and Application II, 59–72. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-18072-0_7.

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Daniel, Joshua D., Dale Henneke y David W. Vehar. "The Effects of Radiation Hardening on the Reusability of CaF2:Mn TLDs". En Reactor Dosimetry: 16th International Symposium, 415–27. 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959: ASTM International, 2018. http://dx.doi.org/10.1520/stp160820170086.

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Li, Hong-Nan, Qiao Jin, Gangbing Song y Guo-Xin Wang. "TLCD Semi-active Control Methodology of Fuzzy Neural Network for Eccentric Buildings". En Lecture Notes in Computer Science, 1089–98. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/11539902_138.

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Xu, Pengfei, Yu Long, Dongmei Zheng y Ruyi Liu. "The Face-Tracking of Sichuan Golden Monkeys via S-TLD". En Communications in Computer and Information Science, 85–91. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-2260-9_11.

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Iemura, H. "Principles of TMD and TLD — Basic Principles and Design Procedure". En Passive and Active Structural Vibration Control in Civil Engineering, 241–53. Vienna: Springer Vienna, 1994. http://dx.doi.org/10.1007/978-3-7091-3012-4_11.

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Zhou, Chenggang, Qiankun Dong, Wenjing Ma, Guoping Long y Tao Li. "PE-TLD: Parallel Extended Tracking-Learning-Detection for Multi-target Tracking". En Algorithms and Architectures for Parallel Processing, 665–77. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-27122-4_46.

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Actas de conferencias sobre el tema "TldD"

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Ikeda, Takashi, Yuji Harata y Shota Ninomiya. "Vibration Control of 2DOF Structures Utilizing Sloshing in Square Tanks". En ASME 2012 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/detc2012-70188.

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This paper investigates the vibration control of a tower-like structure utilizing a square tuned liquid damper (TLD) when the structure is subjected to horizontal, harmonic excitation. In the theoretical analysis, when the tuning condition, 1:1:1:1, is satisfied, the natural frequencies of the 2DOF structure and two predominate sloshing modes are nearly equal. Galerkin’s method is used to derive the modal equations of motion for sloshing. The nonlinearity of the hydrodynamic force due to sloshing is considered in the equations of motion for the 2DOF structure. Linear viscous damping terms are incorporated into the modal equations to consider the damping effect of sloshing. Van der Pol’s method is employed to determine the frequency response curves which are compared to the numerical simulation. The influences of the excitation frequency, the tank installation angle, and the aspect ratio of the tank cross-section on the response curves are examined. The theoretical results show that whirling motions and amplitude modulated motions (AMMs) including chaotic motions may occur in the structure because swirl motions and Hopf bifurcations followed by AMMs appear in the tank. It is also found that square TLDs work more efficiently than conventional rectangular TLDs, and its performance is further improved when the aspect ratio is slightly increased and the installation angle is equal to zero. Experiments were conducted in order to confirm the validity of the theoretical results.
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Yu, Wei, Frank Lemmer y Po Wen Cheng. "Performance of a Passive Tuned Liquid Column Damper for Floating Wind Turbines". En ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-96360.

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Abstract The motivation of the present paper is to show the proof-of-concept of a passive Tuned Liquid Column Damper (TLCD) for floating wind turbines, which increases the platform pitch damping and power production under wind and wave excitations. As the first step, a reliable TLCD model is implemented and coupled with a reduced order floating wind turbine model. Here, the TLCD is modelled as a second order system which is known for ships, whereas the structural model is a coupled aero-hydro-servo-elastic model with five degrees of freedom. The results show that the TLCD is able to damp the platform resonances but to a limited extent, which is inline the findings of previous research. However, the improved platform pitch stability allows a larger blade pitch control bandwidth, which is normally limited by the underdamped soft support platform. Therefore, by introducing the passive TLCD into the floating wind turbine system, a better power production is achieved.
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Sun, Defeng, Bin Dai, Chuanxiang Li y Liang Xiao. "Color name TLD1". En 2015 IEEE International Conference on Information and Automation (ICIA). IEEE, 2015. http://dx.doi.org/10.1109/icinfa.2015.7279392.

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Lee, Chan Hui, Heui Won Kim y Won Ho Joo. "Low Frequency Vibration Control of the Offshore Fixed Platforms by Using Tuned Liquid Column Damper". En ASME 2014 33rd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/omae2014-24635.

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The offshore fixed platforms are confronted with greater wind and wave forces as their installation site moves toward the deep sea, so it is definitely necessary to reduce the low frequency vibration of structures for the safety and comfort of crews. The dynamic dampers are generally used to reduce vibration of structures. Especially, the tuned liquid column damper (TLCD) has been applied to reduce the low frequency vibration of onshore tall buildings. In this paper, the design procedure of TLCD is proposed to control the low frequency vibration of fixed platforms through the simulation and experiment with a small-scale model. The vibration control target is the surge motion of fixed platforms and the major design variables of TLCD are mass and damping ratios. The optimized design variables of TLCD are determined from the calculation of the amplification factor. In the experiment, the effects of mass and damping ratios are considered by changing the breadth of column, the opening ratio and number of the orifices. The results of experiment are found to well agree with the simulation. The 83% of structure vibration level can be reduced by applying the optimized TLCD.
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5

Khan, Ayaz. "Vibration Control of Ships Superstructure using Tuned Liquid Column Damper". En SNAME 5th World Maritime Technology Conference. SNAME, 2015. http://dx.doi.org/10.5957/wmtc-2015-048.

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For a direct unobstructed view over the ship bow, elevation of the bridge on top of deckhouse is required. With this deckhouse mounted over the engine room cavity, adequate structural stiffness is difficult to incorporate. The present study is intended to carry out a vibration control analysis using tuned liquid column damper (TLCD) which can be used against fore and aft vibration of superstructure. First stage analysis is done for the validation of proposed design of TLCD followed by comparative harmonic analysis of superstructure with and without TLCD, using finite element method.
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6

Son, Lovely, Ahmad Husein y Mulyadi Bur. "The influence of TLCD junction angle on the structure response with TLCD". En DISRUPTIVE INNOVATION IN MECHANICAL ENGINEERING FOR INDUSTRY COMPETITIVENESS: Proceedings of the 3rd International Conference on Mechanical Engineering (ICOME 2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5046248.

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Molin, Bernard, Fabien Remy y Julien Bonnici. "Experimental and Numerical Studies of Axisymmetric Tuned Liquid Dampers". En ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/omae2015-41364.

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Tuned Liquid Dampers (TLDs) have proved their efficiency to mitigate the vibratory response of slender buildings under wind or earthquake excitation. Simple semi-analytical models are proposed here to derive the hydrodynamic coefficients (added mass and damping) of axisymmetric TLDs fitted with circular or radial perforated screens. Comparisons are made with experimental values obtained with an Hexapode test bench. Good agreement is observed.
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Chen, Yung-Hsiang, Chia-Hao Ko y Ying-Jan Ding. "Structural Model of TLCD and Its Application". En ASME 2005 Pressure Vessels and Piping Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/pvp2005-71056.

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A proposed mass-coupling structural mechanism is presented in this paper to represent a TLCD attached to a main structural system. It is a simple structural model and can be applied to the structural analysis of any complicate structure by use of the finite element method. The effectiveness of a passive or active TLCD in vibrational reduction of a five-story shear building subjected to earthquake is included as an example for demonstration and discussion.
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Shadman, Milad y Abbas Akbarpour. "Utilizing TLCD (Tuned Liquid Column Damper) in Floating Wind Turbines". En ASME 2012 31st International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/omae2012-83330.

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Among the floating wind turbine support concepts for carrying large-scale wind turbines, the barge type is more simple and inexpensive to install. The ability to install barge type platforms over a broad range of sea depths increases the number of site options suitable for its installation. Although there are several advantages related to barge type platforms, its significant angular motions which induce dynamic loads in the rotor, tower and drivetrain, hinder its commercial development. In this study, a single degree-of-freedom TLCD (Tuned Liquid Column Damper), which is placed on the turbine’s tower, is incorporated into a modified version of the aero-elastic code FAST. The response of a floating wind turbine with a barge type support controlled by a TLCD subjected to couple hydrodynamic and aerodynamic loads is investigated. The solution of multi degree-of-freedom floating wind turbine coupled with a TLCD dynamic system is done by a sequential method. In this method, two coupled systems of nonlinear differential equations are solved separately by a modified version of FAST in which an added module solves the nonlinear differential equation of motion of the TLCD. The results are compared to the baseline system. The results indicate that this passive type control approach can be used to improve the structural response of floating wind turbines.
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Deri, Luca, Maurizio Martinelli, Daniele Sartiano, Michela Serrecchia, Loredana Sideri y Sonia Prignoli. "Implementing Web Classification for TLDs". En 2015 IEEE / WIC / ACM International Conference on Web Intelligence and Intelligent Agent Technology (WI-IAT). IEEE, 2015. http://dx.doi.org/10.1109/wi-iat.2015.112.

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Informes sobre el tema "TldD"

1

Ipe, Nisy E. Characterization of Low-Energy (6-30 keV) Response of Polish TLDs (MTS-N, MCP-N) with Synchrotron Radiation and Determination of Some Fundamental TLD Quantities. Office of Scientific and Technical Information (OSTI), noviembre de 1998. http://dx.doi.org/10.2172/9910.

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Boguslavsky, R., N. Gmuer y W. Thomlinson. The effect of back scatter radiation on surface dose as measured by TLDs. Office of Scientific and Technical Information (OSTI), diciembre de 1991. http://dx.doi.org/10.2172/5530807.

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Boguslavsky, R., N. Gmuer y W. Thomlinson. The effect of back scatter radiation on surface dose as measured by TLDs. Office of Scientific and Technical Information (OSTI), diciembre de 1991. http://dx.doi.org/10.2172/10117978.

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Casson, W. H. y G. T. Mei. Design of an advanced TLD-based fixed nuclear accident dosimeter. Office of Scientific and Technical Information (OSTI), agosto de 1993. http://dx.doi.org/10.2172/10178185.

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VISTA RESEARCH CORP TUCSON AZ. Ada Compiler Validation Summary Report: Certificate Number: 940305W1. 11335 TLD Systems, Ltd. TLD Comanche VAX/1960 Ada Compiler System, Version 4.1.1 VAX Cluster under VMS 5.5 => Tronix JIAWG Execution Vehicle (i960MX) under TLD Real Time Executive, Version 4.1.1. Fort Belvoir, VA: Defense Technical Information Center, marzo de 1994. http://dx.doi.org/10.21236/ada278080.

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Struckmeyer, R. NRC TLD Direct Radiation Monitoring Network. Progress report, October--December 1996. Office of Scientific and Technical Information (OSTI), marzo de 1997. http://dx.doi.org/10.2172/459891.

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Klensin, J. National and Local Characters for DNS Top Level Domain (TLD) Names. RFC Editor, octubre de 2005. http://dx.doi.org/10.17487/rfc4185.

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Brackenbush, L. W., W. V. Baumgartner y J. J. Fix. Response of TLD-albedo and nuclear track dosimeters exposed to plutonium sources. Office of Scientific and Technical Information (OSTI), diciembre de 1991. http://dx.doi.org/10.2172/5926091.

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Struckmeyer, R. NRC TLD direct radiation monitoring network. Progress report, April 1994--June 1994. Office of Scientific and Technical Information (OSTI), agosto de 1994. http://dx.doi.org/10.2172/10182255.

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Struckmeyer, R. NRC TLD direct radiation monitoring network. Progress report, October 1997--December 1997. Office of Scientific and Technical Information (OSTI), marzo de 1998. http://dx.doi.org/10.2172/585006.

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