Relevant bibliographies by topics / CHT

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'CHT'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 February 2022

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Journal articles on the topic "CHT"

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Chen, Lei, Xueyan Bao, Gang Guo, Wenjie Huo, Qingfang Xu, Cong Wang, Qinghong Li, and Qiang Liu. "Effects of Hydrolysable Tannin with or without Condensed Tannin on Alfalfa Silage Fermentation Characteristics and In Vitro Ruminal Methane Production, Fermentation Patterns, and Microbiota." Animals 11, no. 7 (June 30, 2021): 1967. http://dx.doi.org/10.3390/ani11071967.

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This study was conducted to evaluate the potential of hydrolysable tannin (chestnut tannin, CHT) without or with condensed tannin (quebracho tannin, QT) for modulating alfalfa silage fermentation characteristics and in vitro ruminal methane (CH4) production, fermentation profile, and microbiota. Alfalfa (235 g/kg fresh weight) was ensiled with no tannins (control), 2% CHT (CHT2), 5% CHT (CHT5), the combination of CHT and QT at 1% each (CHQ2), and CHT and QT at 2.5% each (CHQ5) of forage dry matter (DM). The CHQ2 treatment was more effective in reducing DM losses, pH, and ammonia–nitrogen to total nitrogen ratios of alfalfa silage than CHT2 and CHT5 treatments. All tannin treatments decreased ruminal CH4 production, and the magnitude of the decrease was greater for the combinations than the individual ones. Total volatile fatty acid (VFA) concentrations and DM degradation decreased by tannin treatments, but microbial protein (MCP) synthesis increased. The total VFA concentrations and DM degradation were lower with CHQ2 treatment than with CHT5 and CHQ5 treatments, but the MCP concentrations were comparable among these treatments. Tannin inclusion decreased the abundance of the anaerobic fungi Ruminococcus albus and Ruminococcus flavefaciens, but enhanced Fibrobacter succinogenes. The combination of CHT and QT alleviated the inhibition of CHT supply alone in Butyrivibrio fibrisolvens, Ruminobacer amylophilus, and Prevotella ruminicola as well as protease. The results revealed that a combination of HT from CHT and CT from QT at a low level can reduce proteolysis and CH4 production of alfalfa silage without impairing ruminal fermentation and microbiota.
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Duvernoy, C., J. Martin, K. Briesmiester, A. Bargardi, O. Muzik, and L. Mosca. "Myocardial Blood Flow and Flow Reserve in Response to Hormone Therapy in Postmenopausal Women with Risk Factors for Coronary Disease." Journal of Clinical Endocrinology & Metabolism 89, no. 6 (June 1, 2004): 2783–88. http://dx.doi.org/10.1210/jc.2003-031674.

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Abstract Estrogen has beneficial effects on markers of coronary heart disease (CHD) risk, but may increase overall CHD events. The effects of hormone therapy on vascular endothelial function have been mixed, and require further assessment. We studied the myocardial blood flow (MBF) response to postmenopausal combination hormone therapy (CHT) in postmenopausal women with risk factors for CHD. We performed dynamic [13N]ammonia positron emission tomography in 15 postmenopausal women in a 7-month placebo-controlled crossover trial of continuous conjugated equine estrogen/cyclical micronized progesterone. MBF was measured at rest, after sympathetic stimulation with the cold pressor test (CPT), and after iv adenosine infusion, to determine baseline, endothelium-dependent, and maximal flows, respectively. Response to CPT was neutral in all women at baseline (−0.51 ± 27%). Adenosine induced a marked increase in MBF (161 ± 111%). Treatment with 3 months of combined estrogen/progestin CHT did not change CPT or adenosine MBF responses. Myocardial flow reserve was unchanged as well. In this group of postmenopausal women at higher cardiovascular risk, no association was found between CHT assignment and change in MBF. Further study is needed to clarify the effects of CHT on the endothelium of women with presumably diseased vasculature.
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Susnjar, Snezana, and Zora Neskovic-Konstantinovic. "Estrogen receptor as the predictive factor for response to chemotherapy in breast cancer." Archive of Oncology 14, no. 3-4 (2006): 156–60. http://dx.doi.org/10.2298/aoo0604156s.

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It has generally been accepted that breast cancer (BC) cells are equally responsive to chemotherapy (CHT) irrespective of ER status. However, subset analyses of disease outcome in recently reported trials on neoadjuvant and adjuvant CHT brought new information about the issue. The subject of this paper is to review these data and to communicate our own results. NSABP B27 was designed to evaluate if adding of docetaxel (D) to conventional neoadjuvant doxorubicin-cyclophosphamide (AC) CHT improves the clinical response rate (cRR) and pathological RR (pRR) in BC patients treated with 4 AC cycles only. Although the adding of D to AC C.T significantly improved RR in both ER-negative and ER-positive BC patients, the pCR was significantly higher in ER-negative than in ER-positive group (16.7% vs. 8.3%) irrespective which regimen was used. ECTO trial and several neoadjuvant studies confirmed the significantly inferior RR to neoadjuvant C.T in ER-positive compared to ER-negative BC patients. Three large randomized Cancer and Leukemia Group B (CALGB) studies (CALGB 8541, CALGB 9344, and CALGB 9741) compared the efficacy of different adjuvant anthracycline-containing or anthracycline/taxane-containing regimens in BC patients. The absolute benefit in 5-year disease-free survival in ER-negative and ER-positive BC patients treated with adjuvant C.T were 22.8% and 7.0%, while corresponding absolute benefits in overall survival were 16.7% and 4.0%. The concept of equal sensitivity of ER-negative and ER-positive BC to CHT has been changing. The future task is to find BC patients with ER-positive BC with no benefit from CHT in whom endocrine therapy is the therapy of first choice. .
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Pokataev, Ilya, Igor Bazin, Mikhail Fedyanin, Alexey Tryakin, Anna Popova, Alexey Rumyantsev, Olga Sekhina, Yury Patutko, Igor Fainstein, and Sergei Tjulandin. "Clinical predictors of second-line chemotherapy (ChT) benefit in pancreatic cancer (PC)." Journal of Clinical Oncology 35, no. 15_suppl (May 20, 2017): e15733-e15733. http://dx.doi.org/10.1200/jco.2017.35.15_suppl.e15733.

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e15733 Background: Second line ChT is shown to improve outcome in selected patients with PC; however there are no approved models predicting its benefit. This retrospective study was aimed to evaluate prognostic factors in patients with PC who had disease progression following 1st line ChT and their value in prediction of 2nd line ChT benefit. Methods: Records of PC patients treated in N.N. Blokhin Russian Cancer Research Center since 2000 to 2015 were analyzed. Inclusion criteria for this retrospective analysis were: morphologically confirmed PC, disease progression after 1st line ChT or adjuvant / induction ChT with ChT-free interval <6 months. The most common clinical factors were evaluated for prognostic significance in the Cox proportional hazards model with overall survival (OS) as the end-point. OS was calculated from the date of progression following previous ChT. Cutoff values for quantitative variables were determined using ROC curve analyses. Results: Records of 172 patients matched the inclusion criteria. Second line ChT was administered in 110 (64%) patients (47% of them received gemcitabine- and/or platinum-based doublets). The Cox multivariate analysis identified two independent prognostic factors: Karnofsky performance status (KPS) ≤70% and neutrophil-to-lymphocyte ratio (NLR) >5 at the time of disease progression after 1st line ChT (Table). Administration of 2nd line ChT improved outcome of patients with favorable prognosis (score ≤1): median OS increased from 1.7 to 5.5 months in groups without (n=23) and with (n=90) ChT, respectively (p=0.02). In patients with poor prognosis (score>1) there were no benefit by administration of 2nd line ChT: medians OS were 2.3 and 1.7 months in groups with (n=20) and without (n=39) ChT, respectively (p=0.23). Conclusions: This novel prognostic model can potentially predict 2nd line ChT benefit in patients with PC, however it needs to be validated in further trials. [Table: see text]
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Kumari, G. Vanitha, S. Asha, A. Nimrodh Ananth, M. A. Jothi Rajan, and T. Mathavan. "Electrical Property of Anchored Chitosan/Silver on Reduced Graphene Oxide Aerogel." Advanced Science Letters 24, no. 8 (August 1, 2018): 5552–55. http://dx.doi.org/10.1166/asl.2018.12147.

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Silver (Ag)/chitosan (CHT) functionalized Reduced graphene oxide aerogel was fabricated. CHT/Ag decorated reduced graphene oxide aerogel (RGOA) was characterized using XRD, Raman spectroscopy, Fourier transformed infrared spectroscopy. Scanning electron microscopy were explaining the surface morphology of CHT/Ag/RGOA. Physical techniques such as, spectroscopy and microscopy spectrum confirms the noncovalent interaction between graphene oxide layers and also the electrostatic interaction between Ag and CHT, RGOA. Electrostatically interacted Ag and CHT could enhance the properties of RGOA. The DC electrical conductivity of the CHT/Ag wrapped RGOA investigated from I–V characteristics using keithly source meter. Thus, results indicate CHT/Ag/RGOA has enhanced electrical conductivity due to the influence of interacted silver particles.
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Jeremic, Branislav, Francesc Casas, Pavol Dubinsky, Antonio Gomez-Caamano, Nikola Čihorić, Gregory Videtic, and Miroslav Latinovic. "Combined modality therapy in Stage IIIA non–small cell lung cancer: clarity or confusion despite the highest level of evidence?" Journal of Radiation Research 58, no. 3 (February 24, 2017): 267–72. http://dx.doi.org/10.1093/jrr/rrx003.

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Abstract Recent years have witnessed a number of clinical trials in Stage IIIA non–small cell lung cancer (NSCLC) comparing (A) induction chemotherapy (CHT) with induction CHT and radiotherapy (RT), each followed by surgery; (B) either induction CHT or induction RT-CHT, each followed by surgery, with definitive RT-CHT (no surgery). Due to the heterogeneity of patient, tumor and treatment characteristics across these trials, various meta-analyses (MAs) have been performed to define the optimal treatment approach in this setting for this clinical presentation. Six such MAs exist. In spite of the differences between MAs, it appears that RT does not add extra benefit to induction CHT administered before surgery, and that a trimodality (i.e. including surgery) regimen is not superior to definitive concurrent RT-CHT. While one can consider both induction CHT followed by surgery and exclusive concurrent RT-CHT as feasible in this setting, lack of pre-treatment predictive factors identifying patients who might preferentially benefit from a surgical approach limits its use to well-planned clinical trials.
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English, Brett A., Martin Appalsamy, Andre Diedrich, Alicia M. Ruggiero, David Lund, Jane Wright, Nancy R. Keller, Katherine M. Louderback, David Robertson, and Randy D. Blakely. "Tachycardia, reduced vagal capacity, and age-dependent ventricular dysfunction arising from diminished expression of the presynaptic choline transporter." American Journal of Physiology-Heart and Circulatory Physiology 299, no. 3 (September 2010): H799—H810. http://dx.doi.org/10.1152/ajpheart.00170.2010.

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Healthy cardiovascular function relies on a balanced and responsive integration of noradrenergic and cholinergic innervation of the heart. High-affinity choline uptake by cholinergic terminals is pivotal for efficient ACh production and release. To date, the cardiovascular impact of diminished choline transporter (CHT) expression has not been directly examined, largely due to the transporter's inaccessibility in vivo. Here, we describe findings from cardiovascular experiments using transgenic mice that bear a CHT genetic deficiency. Whereas CHT knockout (CHT−/−) mice exhibit early postnatal lethality, CHT heterozygous (CHT+/−) mice survive, grow, and reproduce normally and exhibit normal spontaneous behaviors. However, the CHT+/− mouse heart displays significantly reduced levels of high-affinity choline uptake accompanied by significantly reduced levels of ACh. Telemeterized recordings of cardiovascular function in these mice revealed tachycardia and hypertension at rest. After treadmill exercise, CHT+/− mice exhibited slower heart rate recovery, consistent with a diminished cholinergic reserve, a contention validated through direct vagal nerve stimulation. Echocardiographic and histological experiments revealed an age-dependent decrease in fractional shortening, increased left ventricular dimensions, and increased ventricular fibrosis, consistent with ventricular dysfunction. These cardiovascular phenotypes of CHT+/− mice encourage an evaluation of humans bearing reduced CHT expression for their resiliency in maintaining proper heart function as well as risk for cardiovascular disease.
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Xiong, Fen, Jun Tu, Tian Mao, Li Yu, Nana Lin, and Hongfei Liao. "Subfoveal Choroidal Thickness in Myopia: An OCT-Based Study in Young Chinese Patients." Journal of Ophthalmology 2020 (May 5, 2020): 1–7. http://dx.doi.org/10.1155/2020/5896016.

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Myopia is a common cause of visual impairment worldwide. Choroidal thickness (ChT) reflects the characteristic changes in myopic children and may be used as an important index of myopia. The purpose of this study was to investigate ChT and its distribution across the posterior pole in young myopic Chinese patients using enhanced depth imaging optical coherence tomography (EDI-OCT) and to explore the factors associated with it. A total of 402 myopic Chinese patients aged 6–16 years who underwent complete ophthalmic examinations, including those for axial length, cycloplegic refraction, and intraocular pressure, were examined with EDI-OCT. The mean subfoveal ChT was 303.08 ± 76.87 μm and displayed large variations at different positions (p<0.05). The thickest sector was located 3 mm temporally from the fovea. Multivariate regression analysis showed a significant negative correlation of the subfoveal ChT values with axial length (AL), whereas the ChT was moderately influenced by the patient’s sex. AL accounted for 7.9% of the ChT variance, whereas sex explained 9.6% of the ChT variance. In the population aged 11 years and older, AL accounted for 13.1% of the ChT variance. However, in those younger than 11 years, age was the only significant explanatory factor accounting for 5.2% of the ChT variance. In conclusion, we found a significant decrease in ChT with age in myopic children younger than 11 years. The negative association between age and ChT in children aged 11 years and older may be offset by the choroidal thickening mediated by pubertal growth spurts. The positive correlation between ChT and spherical equivalent in myopic adolescents aged 11 years and older suggests that the protective effect of lens thinning against rapid axial elongation disappears with age. Axial elongation becomes the dominant determinant of ChT in this age group.
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Gyasi, Razak M. "Unmasking the Practices of Nurses and Intercultural Health in Sub-Saharan Africa: A Useful Way to Improve Health Care?" Journal of Evidence-Based Integrative Medicine 23 (January 1, 2018): 2515690X1879112. http://dx.doi.org/10.1177/2515690x18791124.

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In 2001 and 2013, the World Health Organization (WHO) published the WHO Traditional Medicine Strategy 2002-2005 and 2014-2023, respectively, to address policy, ethics, quality, and integration of complementary health therapies (CHT). Despite the adoption of these strategic frameworks, sub-Saharan African (SSA) countries largely run dualistic and inclusive health care system. A recent article published in Complementary Therapies in Clinical Practice analyzed the role of practicing nurses in CHT integration and intercultural health in an SSA country setting. Drawing on the Complementary and Alternative Medicine Health Belief Questionnaire, the study specifically examined nurses’ knowledge, practices, and attitudes toward CHT. The study revealed that nurses had low knowledge about CHT, which reflected in their ineptitude to engage in professional practices of CHT. In spite of the knowledge deficit, nurses generally held favorable attitudes toward CHT and the majority supported the need for “safe” and evidence-based integrative model. Efforts to improve CHT-related knowledge of nurses may enhance medical integration in SSA. This commentary proposes novel political will and investment in CHT education and research as well as an inclusion of CHT modules in the nurses’ training programs; viabilities to achieve intercultural health and improved care in SSA.
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Belada, David, Lukáš Smolej, Monika Hrudková, Pavla Štěpánková, Alice Sýkorová, Pavel Žák, Jiří Bukač, and Jaroslav Malý. "Addition of Rituximab Significantly Improves Outcomes in Patients with Diffuse Large B-cell Lymphoma – a Single-center, Retrospective Study." Acta Medica (Hradec Kralove, Czech Republic) 50, no. 2 (2007): 113–18. http://dx.doi.org/10.14712/18059694.2017.66.

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CHOP chemotherapy has been used as a standard first-line treatment for diffuse large B-cell lymphoma since the 1970s. Phase III trials have shown that the addition of rituximab (R) to CHOP chemotherapy leads to significant improvements in response rate, progression-free survival and overall survival. This single-center, retrospective study was performed to evaluate the role of the addition of R to chemotherapy (CHT) in a real-world clinical setting. Outcomes were assessed in 85 patients with newly diagnosed DLBCL treated with CHT alone (n=38) and R-CHT (n=47). Complete response (CR) rates were significantly higher after R-CHT than CHT (93 % vs. 73 %; p=0.02). The relapse rate was significantly higher after CHT compared with R-CHT (38 % versus 12 %; p=0.01). Progression-free survival was significantly extended by the addition of R (median not reached versus 26.1 months; p=0.04). These data bring further support for rituximab- based immunochemotherapy as a standard first-line therapy for patients with DLBCL.
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Dissertations / Theses on the topic "CHT"

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Singh, Amarjit Kumar. "Development of Computer Aided Heat Treatment Planning System for Quenching & Tempering (CHT - q/t) and Industrial Application of CHT-bf & CHT-cf." Link to electronic thesis, 2006. http://www.wpi.edu/Pubs/ETD/Available/etd-050306-224714/.

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Mazzoli, Pietro. "Analisi termo-strutturale CHT-FEM di una testa motore." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2017.

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Il lavoro di tesi tratta un’analisi CHT di una testa motore di Ducati Motor Holding spa. Si è affrontato questo tema con l'intento di migliorare e rendere più accurata l'analisi di distribuzione delle temperature che si sviluppano nei componenti di una bancata motore in condizioni di potenza massima. Tale problematica nasce dagli sviluppi tecnologici degli ultimi decenni finalizzati a massimizzare nei motori a combustioni interna la potenza specifica, tenendo conto che questo crea un aumento significativo dei carichi termici sui componenti del motore. Una sempre maggiore precisione nell'analisi termica risulta quindi necessaria e, in questo lavoro di tesi, si è cercato di ottenerla grazie ad una simulazione CFD-CHT (Conjugate Heat Transfer), in cui si simula e calcola contemporaneamente la conduzione di calore nei componenti solidi accoppiati e combinati al trasferimento di calore per convezione in un fluido, ma anche grazie all'utilizzo di mesh poliedriche e non esaedriche. Queste due principali novità sono presenti nel nuovo codice AVL FIRE M, che è stato lo strumento principale di studio e di lavoro della tesi. Sono state eseguite diverse simulazioni, sia in regime stazionario che transitorio, cercando di ottenere una certa sensibilità su alcuni parametri fisici e sulla mesh poliedrica. L'analisi dei risultati è stata molto soddisfacente: si sono riscontrate distribuzioni di temperature nei componenti solidi molto simili a quelle ottenute da calcoli termici FEM precedentemente eseguiti dall'azienda. In futuro si cercherà di affinare l'analisi numerica del problema, eseguendo ulteriori prove, al fine di individuare i setting di best practice sia per quanto riguarda la generazione della mesh poliedrica sia per quanto riguarda il setup di calcolo.
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Xu, Xiao-Jun. "Immune dysfunction in the skin in atopic dermatitis and its modulation by Chinese herbal therapy." Thesis, University College London (University of London), 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314362.

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HAQUE, ZIAUL. "Spoilers in the Peace Process of the Chittagong Hill Tracts (CHT)." Thesis, Linnéuniversitetet, Institutionen för samhällsstudier (SS), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-45302.

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Gupta, Jatin. "Application Of Conjugate Heat Transfer (Cht) Methodology For Computation Of Heat Transfer On A Turbine Blade." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1230064860.

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El, Harbiti Deeb. "Förbättring av mjukvarubibliotek för parallellberäkningar med programmeringsmodellen Chunks and Tasks." Thesis, Uppsala universitet, Avdelningen för beräkningsvetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-254666.

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Chunks and Tasks is a programming model based on the C ++ programming language. This programming model is used for electronic structure calculations, among other things.The purpose of this project is to improve the CHT-MPI software library for Chunks and tasks, so that calculations of matrix-matrix multiplications are performed more efficiently than they do with the existing software library. The software library is based on the work stealing method, which is a method the software library for Chunks and Tasks uses for the distribution of the calculation work. The considered way to improve the software library is by modifying the work stealing method in a way that makes the distribution of calculation work happen in a more efficient way , which will lead to calculations performed faster than before.Two different modifications of the work stealing method were tested and it led to two new methods, Method 1 and Method 2, which distributed the calculation work differently. Method 1 did not give results that were compatible with the theory, since the calculation time with this method was much longer than the previous method.  The results for method 2 were compatible with the theory for the method. Method 2 distributed the calculation work more efficiently than before which decreased the amount of data sent during the calculations, which led to a shorter calculation time than with the previous method.  This method made an improvement of the software library for the programming model Chunks and Tasks.
Chunks and Tasks är en programmeringsmodell baserad på programspråket C++. Denna programmeringsmodell används vid bl.a. metoder för lösningar av Schrödingerekvationen för elektronerna i molekyler. Syftet med detta projekt är att förbättra mjukvarubiblioteket för Chunks and Tasks, så att beräkningar av matris-matris-multiplikationer utförs på ett effektivare sätt än vad de gör med det existerande mjukvarubiblioteket. Mjukvarubiblioteket använder sig av work stealing-metoden vid fördelning av beräkningsarbetet. Det är tänkt att mjukvarubiblioteket ska förbättras genom att just modifiera work stealing-metoden på ett sätt som får arbetsfördelningen att ske på ett smidigare sätt, vilket i sin tur ska leda till att beräkningarna utförs under en kortare tid än tidigare. Två olika ändringar av work stealing-metoden testades och man fick två nya metoder, metod 1 och metod 2, som fördelade beräkningsarbetet olika sätt. Det som söktes var en metod som kunde minska mängden data som skickades under beräkningarna av olika matris-matrismultiplikationer, då en minskad data-mängd innebar en förkortning av beräkningstiden. Med metod 1 fick man en försämring, då beräkningstiderna blev mycket längre än tidigare. Med metod 2 erhöll man ett bättre resultat, med denna metod fördelades arbetet på ett effektivare sätt som ledde till att mängden data som skickades minskade, vilket även betydde att beräkningstiderna kortades ner. Med denna metod fick man en förbättring av mjukvarubiblioteket för programmeringsmodellen Chunks and Tasks.
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Rogers, Joseph. "Effects of Thread-Local Task Trees in the CHT-MPI C++ Programming Library for the Chunks and Tasks Programming Model." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-372176.

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Programming efficiently in extremely high thread count environments can be both challenging and tedious for the modern programmer. Task based programming models provide an abstraction of the low--level system details by instead allowing a program to be expressed as a set of tasks to executed by the system. However, these abstractions often have an associated performance overhead that can cut into the benefits of running with many threads. The Chunks and Tasks programming model is one such task based abstraction model. The Chunks and Tasks CHT-MPI C++ library, developed at Uppsala University, follows this programming model. The CHT-MPI library works by first spawning a set of worker processes. Tasks are then assigned to the workers in a dynamic fashion so that those who complete their tasks faster than others are automatically assigned additional tasks. This is done to help with load balancing across the system. Workers may also steal tasks from each other. Each worker process may have many threads. In this thesis, the CHT--MPI library is modified to reduce inter-thread communication within individual worker processes. Currently, each worker process has a single master list of all tasks to be executed by that worker. This list is shared between all threads within a single worker. This list sharing can create a performance bottleneck when the tasks are relatively short and the list is being modified often. Adding support to the library for thread-local task trees reduces the number of times that threads must synchronize with the master list. With this new feature, a worker process with twenty threads that was assigned a set of highly granular tasks can see a two times boost in performance when compared to the old version of the library. This level of performance improvement was observed for dense matrix-matrix multiplication and integration benchmarks. This is an important result as being able to effectively scale programs of a fixed problem size across an ever increasing number of threads necessitates being able to efficiently execute them in smaller and smaller parts.
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Souza, Adijailton José de. "Impacto da diversidade bacteriana sob a degradação clorotalonil no solo manejado com biochar." Universidade de São Paulo, 2016. http://www.teses.usp.br/teses/disponiveis/11/11138/tde-05072016-154213/.

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A diversidade microbiana é geralmente considerada por seu papel nos principais processos do ecossistema, tais como a decomposição da matéria orgânica e ciclos biogeoquímicos. No entanto, informações sobre o impacto da diversidade em funções menores, como degradação de xenobióticos são escassas. Nós estudamos a partir da abordagem da \'diluição para extinção\', o papel da diversidade sobre a capacidade da comunidade microbiana em degradar o fungicida clorotalonil (organoclorado). Também estudamos o comportamento da comunidade bacteriana após aplicação do pesticida no solo com e sem biochar. A diversidade microbiana do solo natural foi alterada artificialmente por diluição, constituindo um gradiente de diversidade (SN > 10-1 > 10-3 > 10-6), seguido pela inoculação em amostras de solo estéril e posterior reestruturação (15 dias). Após a reestruturação da comunidade, as amostras foram manejadas com biochar (1% m/m) e tratadas com a dose de campo do CHT. O comportamento da comunidade bacteriana foi estudo por PCR-DGGE e qPCR do gene 16S rDNA através de um experimento com molécula fria (não radiomarcada). Enquanto a capacidade de degradação do CHT foi estudada por radiorespirometria (14C-CHT). Inicialmente, a comunidade de bactérias foi influenciada pelo gradiente de diversidade obtido por diluição. A separação dos grupos bacterianos se mostrou bastante similar nos três primeiros períodos pré-aplicação do CHT (SN > 10-1 - 10-3 > 10-6), enquanto que no período de 15 dias, a dinâmica de grupos foi alterada (SN > 10-1 > 10-3 - 10-6). O fungicida e o biochar não exerceram efeitos na comunidade bacteriana no tempo zero (imediatamente após a aplicação), a modificação no perfil da comunidade foi atribuído à diluição. Nos períodos de 21 e 42 dias, o perfil comunidade bacteriana apresentou forte modificação. Os grupos bacterianos se mostraram mais dispersos quando considerado somente o CHT. Embora, a análise de ANOSIM indicou não haver diferença nas amostras com e sem biochar, sugerindo que o clorotalonil foi quem mais contribuiu na dispersão dos grupos bacterianos. No período de 42 d, a comunidade apresentou resposta positiva, sendo observado aumentos no número de bandas e no índice de Shannon em todos tratamentos. Isto possivelmente, devido a menor concentração do fungicida disponível na solução do solo, diminuindo assim, os efeitos deletérios sobre a comunidade. Os dados de qPCR não apresentaram alteração no número de copias do gene 16S rDNA em todos os tratamentos. A remoção da diversidade impactou fortemente a capacidade da comunidade bacteriana de degradar o clorotalonil. Apesar da capacidade de degradar não ter sido perdida, a mínima alteração na diversidade promoveu elevada redução na taxa de mineralização do CHT. A dissipação do CHT se mostrou rápida (D50 < 1 dia) em todos os tratamentos, além disso, a formação de 14C-resíduos não extraíveis foi constituiu um dos principais mecanismos de dissipação do CHT. A partir da degradação do fungicida, foram detectados três metabólitos. Conclui-se que a modificação por diluição da diversidade bacteriana promoveu impacto negativo na mineralização do clorotalonil. E que a formação de resíduos não extraíveis consistiu no principal mecanismo de dissipação do CHT em ambos solos.
Microbial diversity is generally considered for his role in key ecosystem processes, such as decomposition of organic matter and biogeochemical cycles. However, information about the impact of diversity on minor functions, such as degradation of xenobiotics is scant. We study from the approach of \'dilution to extinction\', the role of diversity on the capacity of microbial community to degrade the chlorothalonil (organochlorine). We also studied the behavior of bacterial community after applying the pesticide in the soil with and without biochar. Microbial diversity of the soil natural (control) was artificially altered by dilution, forming a gradient of diversity (SN > 10-1 > 10-3 > 10-6), followed by inoculation in sterile soil samples and subsequent restructuring (15 days). After of the community restructuring, the samples were handled with biochar (1% w/w) and treated with the chlorothalonil field dose. The behavior of the bacterial community was studied by PCR-DGGE and qPCR of the 16S rDNA gene through an experiment with cold molecule (no radiolabeled). While the CHT degradation capacity was studied by radiorespirometry (14C-CHT). Initially, the community of bacteria was influenced by the diversity gradient obtained by dilution. The separation of bacterial groups showed very similar in the first three pre-application periods of the CHT (SN > 10-1 - 10-3 > 10-6). While in the period of 15 days, the group dynamic has changed (SN > 10-1 > 10-3 e 10-6). During periods of 21 and 42 days, the profile bacterial community showed strong modification. The bacterial groups were more dispersed when only considered the CHT. Although, the ANOSIM analysis indicated no difference in samples with and without biochar, suggesting that chlorothalonil who has contributed the most in the dispersion of bacterial groups. In the period of 42 days, the community presented a positive response, being observed increases in the number of bands and Shannon-Weiner index in all treatments. This possibly due to less concentration of fungicide available in soil solution, thus reducing, the deleterious effects on the community. The qPCR dates showed no change in the number of copies of the 16S rDNA gene in all treatments. The removal of microbial strongly impacted the ability of the bacterial community to degrading chlorothalonil. Despite the ability to degrade not having been lost, the minimum change in diversity promoted high reduction in the rate of mineralization CHT. The dissipation of the CHT showed quick (D50 < 1 d) in all treatments, in addition, the formation of non-extractable 14C-residues was one of the main mechanisms of dissipation of the CHT. From the degradation of chlorothalonil, three metabolites were detected. We conclude that modification by dilution of the bacterial diversity had a negative impact on the mineralization of chlorothalonil. And the formation of non-extractable residues consisted in the main CHT dissipation mechanism in both soils.
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Tripura, Sontosh Bikash. "Blaming Jhum, denying Jhumia : challenges of indigenous peoples land rights in the Chittagong Hill Tracts (CHT) of Bangladesh : a case study on Chakma and Tripura /." Tromsø : Department of Planning and Local Community Research, Universitetet i Tromsø, 2008. http://www.ub.uit.no/munin/bitstream/10037/1535/1/thesis.pdf.

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Björk, Johan. "Compressor CFD simulation method development : A CFD study." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-69880.

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This master thesis project consisted of three parts that all were performed through CFD simulations with the purpose to develop Scania's methods in the subject of CFD. All parts included simulations on Scania's SC92T70 centrifugal compressor. Part one consisted of performing a mesh study for the purpose of reliability, to investigate the convergence of different parameters by refining the boundary layer. The method used is an inflation option called First layer thickness. Five different meshes were generated where the Richardson extrapolation method was used to examine the parameters between the mesh renements. From the result from the examined parameters, an approximate relative error could be calculated to be less than 0.52 %, and a numerical uncertainty of less than 0.35 %, between Mesh3 and Mesh4. In addition to that, Mesh3 had a simulation time of one hour less than for Mesh4. These results motivated the use of mesh3 to be refined enough for further work in this thesis project. This mesh ended at 37, 915, 257 number of elements. The second part consisted of performing steady state CFD simulations, to examine different parameters in order to find indications of the phenomena surge. Here, experimental data was used as reliance to perform CFD simulations on the compressor. Design points from experimental data was used, that ranged from low mass flow rates where surge arises, to high mass flow rates where another phenomena called choke occur. Except for the design points taken from experimental data, a few extra design points where included at low mass flow rates (in the region of surge). The goal was that the analysis of the different parameters would generate fluctuations on the result for the design points in surge region. Four different rotational speeds on the compressor were examined, 56k, 69k, 87k and 110k revolutions per minute. A total of 140 different parameters were examined, where 10 of these indicated on surge. All of these parameters that indicated on surge where found in regions of vicinity to the compressor wheel, which are the regions subjected to the phenomena.The parameters indicating on surge where mass flow, pressure coefficient, static pressure and temperature. Indications where found at the wheel inlet, ported shroud, and wheel outlet interfaces. The indications were only found for the two lower rotational speeds of the compressor wheel. To capture the behaviour on higher rotational speeds, more design points in the region of surge are needed, or transient simulations. Part three of the thesis project consisted of investigating the methodology of performing a Conjugate Heat Transfer model (CHT) with the CFD code CFX. This part has not been performed by Scania before, so a big part of the problem was to investigate if it actually was achievable. The goal was to use this model to calculate the heat transfer between fluid and solid parts, as well as between the solid parts and the ambient. One question Scania wanted to answer was if the CHT model could generate aerodynamic performance that corresponds to Scania's traditional adiabatic model, as well as to experimental data of the compressor. In this part, both solid and fluid domains were included in the geometryto calculate heat transport, in contrast to the traditional adiabatic model that only uses the fluid domains. Because of that, a big part of the work consisted of defining all interfaces connecting together surfaces between all domains. This is needed to model heat transport between the domains. In the set up part in CFX, the CHT model differed a lot from the traditional adiabatic model in that way that the outer walls was not set up as adiabatic anymore. In the CHT model, instead heat transfer is allowed between the outer walls of the fluids and the solids. From the result simulations, one could see that the CHT model was able to compute the heat transfer between fluids and solids. It also managed to export thermal data such as heat flux and wall heat transfer coefficient to be used for mechanical analysis, which is an important part in Scania's work. From the analysis of aerodynamic performance, a conclusion was drawn that the CHT model was able to compute efficiency and pressure ratio that followed the behaviour ofthe traditional adiabatic model as well as experimental data. However, for lowermass flows, the CHT model started to underpredict which could be explained by the geometrical differences between the CHT and adiabatic model. By analysis of temperature, one could see quantitative differences compared to the traditional adiabatic model. For other parameters (static and total pressure), there were no experimental data to be used for comparison. Because of that, an important part in future work of this CHT method development is to perform more experimental test for CFD data to be compared against. Another important part to compare the models is to have an identical geometry. Without an identical geometry, deviations in result will occur that depends on geometry.
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Books on the topic "CHT"

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Abedin, Zainal. CHT, that sheds blood. Dhaka, Bangladesh: Sunzida Anzuman, 1997.

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Ali, Syed Murtaza. The hitch in the hills: [CHT diary]. [Chittagong]: Dil Monowara Begum, 1996.

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Nuaw Pahr (Organization : Bangladesh), ed. Mother Language Celebration of the CHT Indigenous Peoples. Rangamati: Nuaw Pahr, 2001.

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Hebrock, Andrea, and Bellinda Seiller. Ich mo cht' so gern Prinzessin sein!: [Geschichten und Gedichte]. Mu nster: Coppenrath, 2009.

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s, O. Floinn Toma, ed. Dru cht an ghleanna: Rogha da nta agus da nta nua. Baile A tha Cliath: An Gu m, 1986.

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Skinner, Jessica. Internal displacement in the CHT and rights-based approaches to rehabilitation. Dhaka: Refugee and Migratory Movements Research Unit, 2008.

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Development Research Centre on Migration, Globalization, and Poverty. and Refugee and Migratory Movements Research Unit., eds. Internal displacement in the CHT and rights-based approaches to rehabilitation. Dhaka: Refugee and Migratory Movements Research Unit, 2008.

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Skinner, Jessica. Internal displacement in the CHT and rights-based approaches to rehabilitation. Dhaka: Refugee and Migratory Movements Research Unit, 2008.

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The purity of kingship: An edition of CHT 569 and related Hittite oracle inquiries of Tuthaliya IV. Leiden: Brill, 1998.

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Parbatya Chattagram Jana Samhati Samiti. Report on the implementation of the CHT accord: Signed in 1997 between the Government of Bangladesh and the PCJSS. Rangamati: Information and Publicity Department, Parbatya Chattagram Jana Samhati Samiti, 2004.

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Book chapters on the topic "CHT"

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Chakma, Bhumitra. "The CHT and the Peace Process." In Routledge Handbook of Contemporary Bangladesh, 306–15. New York, NY : Routledge, [2016]: Routledge, 2016. http://dx.doi.org/10.4324/9781315651019-25.

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Vinogradov, K., and G. Kretinin. "Application of UQ for Turbine Blade CHT Computations." In Uncertainty Management for Robust Industrial Design in Aeronautics, 365–81. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-77767-2_23.

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Towara, Markus, Johannes Lotz, and Uwe Naumann. "Discrete Adjoint Approaches for CHT Applications in OpenFOAM." In Computational Methods in Applied Sciences, 163–78. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-57422-2_11.

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Özdemir, Sinan, R. Baar, and H. P. Schmalzl. "A new approach for the CHT-simulation of heat transfer in radial turbine stages." In 17. Internationales Stuttgarter Symposium, 1477–91. Wiesbaden: Springer Fachmedien Wiesbaden, 2017. http://dx.doi.org/10.1007/978-3-658-16988-6_112.

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Posselt, Frederik, L. Gorli, K. Claramunt, B. Leonard, and Y. Li. "Thermal behaviour of a SUV car with a fully coupled 3D-CFD CHT simulation." In 17. Internationales Stuttgarter Symposium, 475–89. Wiesbaden: Springer Fachmedien Wiesbaden, 2017. http://dx.doi.org/10.1007/978-3-658-16988-6_38.

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Mukherjee, Kunal. "Insurgency in South and Southeast Asia: Kashmir, The Chittagong Hill Tracts (CHT), South Thailand and Aceh, Indonesia." In Race, Ethnicity and Religion in Conflict Across Asia, 170–219. Abingdon, Oxon; New York: Routledge, 2021. |: Routledge, 2021. http://dx.doi.org/10.4324/9781003106135-5.

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Uddin, Mohammad Moin. "Settlement of Indigenous Land Disputes by the CHT Land Dispute Resolution Commission of Bangladesh: Challenges and Possible Solutions." In The Indian Yearbook of Comparative Law, 251–78. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-7052-6_11.

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Mattar, Nikita, and Ipke Wachsmuth. "Small Talk Is More than Chit-Chat." In Lecture Notes in Computer Science, 119–30. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-33347-7_11.

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Ferretti, Niccolò, and Alessandro Zito. "Introduzione al design in Italia: uno sguardo d’insieme." In Italienisches, europäisches und internationales Immaterialgüterrecht, 77–88. Berlin, Heidelberg: Springer Berlin Heidelberg, 2020. http://dx.doi.org/10.1007/978-3-662-62179-0_3.

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ZusammenfassungCos’è il design? Per dare una risposta a questa domanda viene in aiuto una definizione di un celebre architetto contemporaneo: „nel linguaggio corrente design indica sia il mestiere di chi trasferisce valore estetico e originalità a un artefatto fisico o virtuale sia quell’artefatto medesimo. Si dice infatti comunemente che un certo oggetto è di design. Entrambi, prodotto e mestiere, sono caratterizzati da ricerca espressiva, innovazione tecnologica, eterodossia formale, contemporaneità“. La tutela dei disegni e modelli è un bene fondamentale per le imprese di qualsiasi dimensione.
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Stahl, Gerry. "A Chat About Chat." In Studying Virtual Math Teams, 7–16. Boston, MA: Springer US, 2009. http://dx.doi.org/10.1007/978-1-4419-0228-3_1.

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Conference papers on the topic "CHT"

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Song, Ki Sang, and Kyeong Sik Chae. "A Study on Improvement Through Analysis of Cold Hydrostatic Test Cases in Korea Nuclear Power Plants." In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25298.

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The objective of this study is to analyze the effectiveness of the Cold Hydrostatic Test (CHT) process and determine the optimum method of completing a CHT through case studies in the Korea nuclear power plants. In this study, all the 9 CHT cases, performed for the past sixteen years (1993 to 2009) in Korea nuclear power plants, will be examined and evaluated. There are twenty (20) operating Units and eight (8) Units under construction at 3 nuclear facility sites in Korea. Among the 20 Units, only 4 Units at the Wolsong site are pressurized heavy water reactors (PHWR), the others are pressurized light water reactors (PWR). CHT is based on the requirements of ASME NB-6200 & NC-6220. CHT is a mandatory test to verify integrity of weld points and interfaces associated with the equipment and pipes of the Reactor Coolant System (RCS) pressure boundary. The design pressure of the RCS is 2,500psia (175.8 kg/cm2 a). The major steps of test sequence of a CHT is RCS filling, venting, heat up, pressurization and inspection. Reactor Coolant Pump (RCP) operation is utilized as thermal input to raise RCS temperature over 120 °C. The Chemical and Volume Control System (CVCS) Charging Pump, or temporary hydro pump is used to pressurize the RCS. CHT requires pressure to be raised and maintained more than 10 minutes at 1.25 times of design pressure, and then be depressurized and inspected at the design pressure of 2,500psia (175.8 kg/cm2 a). According to the analyzed results of the CHT cases, all CHTs were successfully conducted but there are several items which need to revised and modified for increased effectiveness of the CHT. These items include pressurizer manway gasket leakage, improper process of the procedure and others. In conclusion, the results of this study will be used to prevent similar errors and improve the effectiveness of the CHT for future nuclear power plants projects in Korea.
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Ho, Kuo-San, Christopher Urwiller, S. Murthy Konan, Jong S. Liu, and Bruno Aguilar. "Conjugate Heat Transfer Analysis for Gas Turbine Cooled Stator." In ASME Turbo Expo 2012: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/gt2012-68196.

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This paper explores the conjugate heat transfer (CHT) numerical simulation approach to calculate the metal temperature for the gas turbine cooled stator. ANSYS CFX12.1 code was selected to be the computational fluid dynamic (CFD) tool to perform the CHT simulation. The 2-equation RNG k-ε turbulence model with scalable modified wall function was employed. A full engine test with thermocouple measurement was performed and used to validate the CHT results. Metal temperatures calculated with the CHT model were compared to engine test data. The results demonstrated good agreement between test data and airfoil metal temperatures and cooling flow temperatures using the CHT model. However, the CHT calculations in the outer end wall had a discrepancy compared to the measured temperatures, which was due to the fact that the CHT model assumed an adiabatic wall as a boundary condition. This paper presents a process to calculate convection heat transfer coefficient (HTC) for cooling passages and airfoil surfaces using CHT results. This process is possible because local wall heat flux and fluid temperatures are known. This approach assists in calibrating an in-house conduction thermal model for steady state and transient thermal analyses.
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Moretti, Rocco, Marc Errera, and Frédéric Feyel. "Temporal Interpolation Methods for Transient CHT." In AIAA Scitech 2019 Forum. Reston, Virginia: American Institute of Aeronautics and Astronautics, 2019. http://dx.doi.org/10.2514/6.2019-2059.

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Patankar, Suhas V. "DEVELOPMENT OF CHT: AN EXCITING JOURNEY." In Proceedings of CHT-15. 6th International Symposium on ADVANCES IN COMPUTATIONAL HEAT TRANSFER , May 25-29, 2015, Rutgers University, New Brunswick, NJ, USA. Connecticut: Begellhouse, 2015. http://dx.doi.org/10.1615/ichmt.2015.intsympadvcomputheattransf.1700.

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Wendt, Daniel S., Piyush Sabharwall, and Vivek Utgikar. "Technologies for Upgrading Light Water Reactor Outlet Temperature." In ASME 2013 Heat Transfer Summer Conference collocated with the ASME 2013 7th International Conference on Energy Sustainability and the ASME 2013 11th International Conference on Fuel Cell Science, Engineering and Technology. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/ht2013-17122.

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Nuclear energy could potentially be utilized in hybrid energy systems to produce synthetic fuels and feedstocks from indigenous carbon sources such as coal and biomass. First generation nuclear hybrid energy system (NHES) technology will most likely be based on conventional light water reactors (LWRs). However, these LWRs provide thermal energy at temperatures of approximately 300°C, while the desired temperatures for many chemical processes are much higher. In order to realize the benefits of nuclear hybrid energy systems with the current LWR reactor fleets, selection and development of a complimentary temperature upgrading technology is necessary. This paper provides an initial assessment of technologies that may be well suited toward LWR outlet temperature upgrading for powering elevated temperature industrial and chemical processes during periods of off-peak power demand. Chemical heat transformers (CHTs) are a technology with the potential to meet LWR temperature upgrading requirements for NHESs. CHTs utilize chemical heat of reaction to change the temperature at which selected heat sources supply or consume thermal energy. CHTs could directly utilize LWR heat output without intermediate mechanical or electrical power conversion operations and the associated thermodynamic losses. CHT thermal characteristics are determined by selection of the chemical working pair and operating conditions. This paper discusses the chemical working pairs applicable to LWR outlet temperature upgrading and the CHT operating conditions required for providing process heat in NHES applications.
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Ho, Kuo-San, Christopher Urwiller, S. Murthy Konan, Jong S. Liu, and Bruno Aguilar. "Conjugate Heat Transfer Analysis for Gas Turbine Cooled Blade." In ASME Turbo Expo 2014: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/gt2014-25952.

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This paper explores the conjugate heat transfer (CHT) numerical simulation approach to calculate the metal temperature for a cooled gas turbine blade. ANSYS CFX14.0 code was selected as the computational fluid dynamic (CFD) tool to perform the CHT simulation. The two-equation SST turbulence model with automatic wall treatment was employed. A full engine test with Silicon Carbide (SiC) chip measurements was performed and used to validate the CHT results. Metal temperatures calculated with the CHT model were compared to engine test data. The results demonstrated good agreement between predicted and measured airfoil metal temperatures. The blade cooling flow prediction was matched to the flow network analysis. This paper describes a process to calculate convection heat transfer coefficients (HTC) for cooling passages and airfoil surfaces using CHT results. This process was made possible because local wall heat flux and fluid temperatures were known. This approach assisted in calibrating an in-house conduction thermal model for steady state thermal analyses.
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Tan, Qinxue, Jia Li, Jing Ren, and Hongde Jiang. "Second-Order Viscous/Heat Fluxes Scheme: Hyperbolic System for RANS Flow and Conjugate Heat Transfer Problem in Gas Turbine." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-42973.

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Accurate and robust scheme of diffusive flux is critical for the numerical simulations of turbulence flow and CHT problem. In this work, a general framework of constructing upwind diffusive flux scheme is investigated based on the first order hyperbolic system. The governing equations of RANS flow and CHT problem are discretized as a unified hyperbolic Convection-Diffusion system and Navier-Stokes system. One approximation approach, assuming the numerical fluxes of equations solution gradients are independent on the fluids’ compressibility, is proposed to simplify the calculation of diffusive flux for the Hyperbolic Navier-Stokes system, and the numerical accuracy is tested by several verification cases. To stabilize the computations, Lr=O(h) is suggested, and the upwind diffusive fluxes are applied to the RANS flow and CHT problem successfully. Moreover, the accuracy analysis and the convergence feature of hyperbolic CHT system are carried on. Preliminary results show that hyperbolic CHT system has a potential to simulate the distribution of temperature on the fluid-solid interface more accurately, and has some superiority to speed up the convergence.
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Amaral, Sergio, Tom Verstraete, Rene´ Van den Braembussche, and Tony Arts. "Design and Optimization of the Internal Cooling Channels of a HP Turbine Blade: Part I—Methodology." In ASME Turbo Expo 2008: Power for Land, Sea, and Air. ASMEDC, 2008. http://dx.doi.org/10.1115/gt2008-51077.

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This first paper describes the Conjugate Heat Transfer (CHT) method and its application to the performance and lifetime prediction of a high pressure turbine blade operating at a very high inlet temperature. It is the analysis tool for the aerothermal optimization described in a second paper. The CHT method uses three separate solvers: a Navier-Stokes (NS) solver to predict the non-adiabatic external flow and heat flux, a Finite Element Analysis (FEA) to compute the heat conduction and stress within the solid, and a 1D aero-thermal model based on friction and heat transfer correlations for smooth and rib-roughened cooling channels. Special attention is given to the boundary conditions linking these solvers and to the stability of the complete CHT calculation procedure. The Larson-Miller parameter model is used to determine the creep-to-rupture failure lifetime of the blade. This model requires both the temperature and thermal stress inside the blade, calculated by the CHT and FEA. The CHT method is validated on two test cases: a gas turbine rotor blade without cooling and one with 5 cooling channels evenly distributed along the camber line. The metal temperature and thermal stress distribution in both blades are presented and the impact of the cooling channel geometry on lifetime is discussed.
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Humber, William, Ron-Ho Ni, Jamie Johnson, John Clark, and Paul King. "Comparison of Conjugate Heat Transfer Analysis of Flat Plate Film Cooling Arrays Against Experimental Data." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-42398.

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Conjugate heat transfer (CHT) simulations were conducted for five film-cooled flat plates designed to model the pressure side of the High Impact Technologies Research Turbine First Vane (HIT RT1V). The numerical results of the CHT analysis were compared against experimental data. The five test cases consist of one baseline geometry and four different cooling hole geometries applied to a film-cooling hole arrangement that was optimized to achieve a more uniform cooling effectiveness. This optimized film-cooling hole configuration was designed by coupling a genetic algorithm with a Navier-Stokes fluid solver, using source terms to model film holes, starting from a baseline cooling configuration. All five plates were manufactured, and surface temperature measurements were taken using infrared thermography while the plates were exposed to flow conditions similar to the pressure side of the HIT RT1V. CHT simulations were carried out using unstructured meshes for both fluid and solid with all film holes fully resolved. Comparison of experimental data and simulations shows a consistent trend between the optimized configurations as well as correct predictions of the flow characteristics of each hole geometry although the absolute temperatures are underpredicted by the CHT. Both experimental measurements and CHT predictions show the optimized geometry with mini-trenched-shaped holes to give the best cooling effectiveness.
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Oh, Tae Kyung, Danesh Tafti, and Krishnamurthy Nagendra. "LES-Conjugate Heat Transfer Analysis of a Ribbed Cooling Passage Using the Immersed Boundary Method." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-90397.

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Abstract The present study focuses on evaluating fully-coupled conjugate heat transfer simulation in a ribbed cooling passage with a fully developed flow assumption using LES with the immersed boundary method (IBM-LES-CHT). The IBM-LES and the IBM-CHT frameworks are validated prior to the main simulations by simulating purely convective heat transfer in the ribbed duct, and a laminar boundary layer flow over a 2D flat plate with heat conduction, respectively. For the main conjugate simulations, a ribbed duct geometry with a blockage ratio of 0.3 is simulated at a bulk Reynolds number of 10,000 with a conjugate boundary condition applied to the rib surface. The nominal Biot number is kept at 1, which is similar to the comparative experiment. As a means to overcome a large time scale disparity between the fluid and the solid regions, the use of a high artificial solid thermal diffusivity is compared to the physical diffusivity. It is shown that while the diffusivity impacts the instantaneous fluctuations in temperature, heat transfer and Nusselt numbers, it has an insignificantly small effect on the mean Nusselt number. Comparison between IBM-LES-CHT and iso-flux heat transfer simulations shows that the iso-flux case predicts higher local Nusselt numbers at the back face of the rib. Furthermore, the local Nusselt number augmentation ratio (EF) predicted by IBM-LES-CHT is compared to experiment and another LES conjugate simulation. Even though there is a mismatch between IBM-LES-CHT predictions and other two studies at the front face of the rib, the area-averaged EF compares reasonably well in other regions between IBM-LES-CHT prediction and the comparative studies.
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Reports on the topic "CHT"

1

Keidar, Michael. Multi-Scale Modeling of Novel Hall Thrusters: Understanding Physics of CHT and DCF Thrusters. Fort Belvoir, VA: Defense Technical Information Center, December 2011. http://dx.doi.org/10.21236/ada563468.

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L., Loft, Pham T.T., and Luttrell C. Bài hoc tu Chi tra Dich vu He sinh thái cho các co che chia se loi ích REED+. Center for International Forestry Research (CIFOR), 2014. http://dx.doi.org/10.17528/cifor/005046.

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Baich, M. A. CST/FRIT Settling, CST Particle Size Reduction and CST Loading. Office of Scientific and Technical Information (OSTI), August 2000. http://dx.doi.org/10.2172/761150.

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Mangum, B. W. CCT-K3 :. Gaithersburg, MD: National Bureau of Standards, 2002. http://dx.doi.org/10.6028/nist.tn.1450.

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Moritsugu, Michiyasu, Tadayoshi Nakase, Makoto Okada, Yasuyuki Haseo, Kouji Morioka, and Kei Yuasa. CVT Fluid Flow Rate Measurement in CVT Lubricating Systems. Warrendale, PA: SAE International, September 2005. http://dx.doi.org/10.4271/2005-08-0413.

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James, R., A. E. Bolotnikov, and Yonggang Cui. CZT nanoRAIDER_VFG Factsheet. Office of Scientific and Technical Information (OSTI), January 2016. http://dx.doi.org/10.2172/1237188.

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Skone, Timothy J. Mountain Pass CHP. Office of Scientific and Technical Information (OSTI), April 2014. http://dx.doi.org/10.2172/1509086.

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Lin, Shu Hwa, and Liezel Pagala. Diamond Cut Dress. Ames: Iowa State University, Digital Repository, September 2016. http://dx.doi.org/10.31274/itaa_proceedings-180814-1609.

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9

Comin, Diego, and Bart Hobijn. The CHAT Dataset. Cambridge, MA: National Bureau of Economic Research, September 2009. http://dx.doi.org/10.3386/w15319.

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Kumar, Srinath Shiv, Dulcy M. Abraham, Hamed Zamenian, Bhavik Ranka, and Prieston Lobo. Warranty Utility Cut Repairs (QC/QA of Utility Cut Repairs). Purdue University, March 2019. http://dx.doi.org/10.5703/1288284316780.

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