Готові списки джерел за темами / SRFT

Добірка наукової літератури з теми "SRFT"

Автор: Grafiati
Опубліковано: 11 вересня 2023

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Статті в журналах з теми "SRFT"

1

Sun, Yawei, Guoyong Zhang, Xiaoqing Hou, Shuai Xiao, Xi Yang, Yali Xie, Xiyin Huang, et al. "SrfABC Toxin from Xenorhabdus stockiae Induces Cytotoxicity and Apoptosis in HeLa Cells." Toxins 11, no. 12 (November 22, 2019): 685. http://dx.doi.org/10.3390/toxins11120685.

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Анотація:
Our previous study showed that the srfABC operon, which was originally identified in Salmonella enterica as an SsrB-regulated operon clustered with the flagellar class 2 operon, exhibited significant cytotoxicity against insect midgut CF-203 cells and injectable insecticidal activity against Helicoverpa armigera larvae. The srfABC operon was widely distributed among bacteria, which raises the question of their biological roles in different species. In this study, we investigated the cytotoxic effect of SrfABC toxin on mammalian cell lines. When simultaneously expressed in the Escherichia coli cytoplasm, SrfABC exhibited cytotoxicity against all tested mammalian cancer cell lines (B16, 4T-1, Hep-3B, and HeLa) in a dose-dependent manner. Intracellular expression of SrfA–FLAG, SrfB–FLAG, or SrfC–FLAG also resulted in inhibition of proliferation and apoptosis on HeLa cells. When incubated with HeLa cells separately, SrfA, SrfB, and SrfC proteins alone could enter HeLa cells, then induce apoptosis and cytotoxicity. SrfC protein shifts its localization from cytoplasm to nucleus with the aid of SrfA and/or SrfB protein. Although SrfA, SrfB, and SrfC proteins alone exhibited a cytotoxic effect against HeLa cells, all three components were essential for the full cytotoxicity. Native PAGE and co-immunoprecipitation assay demonstrated that SrfA, SrfB, and SrfC proteins could interact with each other and form a heteromeric complex.
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2

Hughes, Luke D., Jamal Khudr, Edward Gee, and Anand Pillai. "Pitfalls preventing bone union with EXOGEN Low-Intensity Pulsed Ultrasound." SICOT-J 8 (2022): 15. http://dx.doi.org/10.1051/sicotj/2022012.

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Objectives: To evaluate the efficacy of EXOGEN in achieving union and common pitfalls in its use within the Manchester Foundation Trust (MFT) and Salford Royal Foundation Trust (SRFT). Method: Patients receiving EXOGEN therapy between 01/01/2017 and 31/12/2019 at hospitals within MFT and SRFT were identified using EXOGEN logbooks and hospital IT systems. An equal number of patients were included from both sites. Data were retrospectively collected from clinical documents detailing clinical presentation comorbidities, and radiographic images, determining the radiological union post EXOGEN therapy. In addition, local practices were observed and compared to EXOGEN’s standardized guidance for clinicians. Results: Fifty-eight patients were included in the primary review, with 9 subsequently excluded based on insufficient clinical data. 47% of patients achieved radiological union following completion of EXOGEN therapy. Outcomes of the 23 patients with persistent non-union were as follows – 18 were referred for revision surgery, 5 were prescribed further EXOGEN therapy, 2 refused or were unfit for further intervention, and 1 did not have a plan documented. No significant baseline differences were present in both outcome groups. However, at MFT and SRFT, rates of union with EXOGEN are below that previously published in the literature. Conclusion: EXOGEN has proven successful in facilitating union in established cases of non-union without the risk and cost associated with revision surgery. Centre outcome differences may be explained by failure to educate clinicians and patients on the correct use of the EXOGEN device, failure to standardize follow-up or monitor compliance, and must be addressed to improve current services.
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3

Zhou, Heng-Jun, Xiu-Jue Zheng, Feng-Zeng Jian, Yue-Hui Ma, and Ren-Ya Zhan. "Posterior Approach Combined with Thoracic Intervertebral Foramen Posterior Wall Opening and Spinal Reconstruction for Complex Thoracic Intervertebral Foramen Lesions: a Single-Centre Experience." Clinical Surgery Research Communications 3, no. 2 (June 25, 2019): 01–07. http://dx.doi.org/10.31491/csrc.2019.06.030.

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Background: Thoracic intervertebral foramen (TIF) lesions were really difficult to expose through posterior or transforaminal approaches. There was no effective treatment strategy, especially for complex ones. Methods: Between 2013 and 2015, 22 patients presenting with complex TIF lesions underwent posterior approach combined with TIF posterior wall opening and spinal reconstruction were retrospectively reviewed. After ascertaining the precise location of complex TIF lesions, incisions should allow for exposure of the lesion’s adjacent vertebral pedicle screw entry point. The adjacent pair of vertebral lamina and spinous processes is typically removed in a single piece, such that the intra-spinal section can be fully exposed. The posterior wall of the TIF is subsequently opened, allowing the intra-TIF and extra-spinal sections to be sufficiently exposed. Subsequently, spinal reconstruction at the appropriate level is required. When the ventral spinal column is intact, dorsal reconstruction is typically performed using the screw and rod fixation technique (SRFT). After the dorsal surface of the spine has been burnished, the removed vertebral lamina and spinous process are rendered granular to allow reconstruction of the TIF and fusion of adjacent vertebrae. Results: All patients presenting with complex TIF lesions were successfully treated with this approach. No patient had experienced any complications arising from SRFT use. No patient suffered intraspinal infection, incision splits, or CSF leakage in the short-term (between 1 and 3 months) or fixation loosening or spinal instability in the long-term (6–24 months). Imaging studies confirmed that the TIF and spinal reconstruction outcomes were favorable. Conclusion: A posterior approach combined with TIF posterior wall opening and spinal reconstruction is a rapid, effective, and reliable method in the treatment of complex TIF lesions. This technique can provide total lesion resection while reconstructing spinal stability. Keywords: posterior approach; thoracic intervertebral foramen (TIF); intervertebral articular process (IAP); spinal reconstruction; screw and rod fixation technique (SRFT)
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4

Rivera, Beverly, Francisco Zapata, and Vladik Kreinovich. "Security Risk Assessment: Towards a Justification for the Security Risk Factor Table Model." Journal of Advanced Computational Intelligence and Intelligent Informatics 19, no. 5 (September 20, 2015): 676–80. http://dx.doi.org/10.20965/jaciii.2015.p0676.

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Анотація:
One of the widely used methods to gauge risk is the Security Risk Factor Table (SRFT) model. While this model has been empirically successful, its use is limited by the fact that its formulas do not have a theoretical explanation – and thus, there is no guarantee that these formulas will work in other situations as well. In this paper, we provide a theoretical explanation for the SFRT formulas.
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5

Sáez de Villarreal, Eduardo, Jose Galán Molina, Guillermo de Castro-Maqueda, and José V. Gutiérrez-Manzanedo. "Effects of Plyometric, Strength and Change of Direction Training on High-School Basketball Player’s Physical Fitness." Journal of Human Kinetics 78, no. 1 (March 1, 2021): 175–86. http://dx.doi.org/10.2478/hukin-2021-0036.

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Abstract The study aim was to compare the effects of a 7-week plyometric, strength and change of direction (COD) training program on basketball-specific performance measures in high-school players. Forty male players were randomly assigned to one of the four groups: plyometric (PG, n = 10), strength (SG, n = 10), COD (CODG, n = 10), and control group training (CG, n = 10). Two training sessions were performed at weekly intervals before basketball training. Performance of the counter movement jump (CMJ), Abalakov jump (ABKJ), 10 m zig-zag sprint, 20 m in line sprint (measurements at 10 and 20 m), and sit and reach flexibility test (SRFT) was assessed before and after the intervention. A 4 (group) × 2 (time) repeated measures analysis of variances (ANOVA) was conducted for each variable. Bonferroni post-hoc tests were used when the interaction was significant. Significant (all p < 0.05) time x group interaction was noted for SRFT, CMJ, ABK, sprint, and zig-zag 10 m, in favor of the experimental groups compared to the control group. However, improvements in physical fitness were similar between the three experimental groups. In conclusion, 7 weeks of specific plyometric, strength and COD training produced similar medium to large improvements in physical fitness of high-school basketball players.
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6

Serbanescu, Agnes, Mona Barbu, Ionut Cristea, Lidia Kim, Gina Alina Catrina, Georgiana Cernica, and Ileana Nicolescu. "Municipal solid waste (MSW) - competitive raw materials for combustible materials obtaining." Romanian Journal of Ecology & Environmental Chemistry 2, no. 2 (October 14, 2020): 170–79. http://dx.doi.org/10.21698/rjeec.2020.221.

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Анотація:
Waste-to-energy projects can be classified as a complementary technology for energy recovery from nonrecyclable municipal waste fractions and should therefore not compete with measures to reduce, reuse, and recycle materials. The article presents the characterization of some treated municipal solid wastes as competitive raw materials for combustible materials obtaining. Samples with lignocellulosic and polymeric composition were analyzed, namely 3 samples of SRFs (solid recovered fuels) used as secondary raw material in cement plants, SRF1, SRF2, SRF3; a sample of RDF, consisting of household waste; a sample of fluff (a homogeneous mixture of non-hazardous waste - selected, mechanically treated and dried) used as a secondary raw material in cement plants; 4 samples of municipal solid waste, fractions smaller than 100 mm, after a bio-drying process, with composition: paper and cardboard (70-80%), wood (6-15%), plastic (6-10%), glass and metal (3-14%), MBU1, MBU2, MBU3, MBU4. The waste samples were characterized in terms of technical and elementary characteristics and the ash (obtained by the sample incineration) behavior in the combustion process. The mineral matter was investigated by the X-ray fluorescence analytical technique using the Rigaku CG X-ray Spectrofluorimeter. The analysis of the indices used for the slagging and deposit formation risks evaluation shows that the analyzed samples present an obvious risk of melt formation and deposits, due to a high content of base oxides and silicon oxide.
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7

Khan, A., F. R. Espinoza, T. Kneen, A. Dafnis, H. Allafi, B. Carter, M. Narro-Vidal, et al. "558 PREVALENCE AND IMPACT OF FRAILTY IN PATIENTS HOSPITALISED WITH COVID-19. THE SALFORD EXPERIENCE IN WAVES 1 AND 2." Age and Ageing 50, Supplement_2 (June 2021): ii14—ii18. http://dx.doi.org/10.1093/ageing/afab119.15.

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Анотація:
Abstract Introduction The COVID-19 pandemic has had an extensive impact on the frail older population, with significant rates of COVID-related hospital admissions and deaths amongst this vulnerable group. There is little evidence of frailty prevalence amongst patients hospitalised with COVID-19, nor the impact of frailty on their survival. Methods Prospective observational study of all consecutive patients admitted to Salford Royal NHS Foundation (SRFT) Trust between 27th February and 28th April 2020 (wave 1), and 1st October to 10th November 2020 (wave 2) with a diagnosis of COVID-19. The primary endpoint was in-hospital mortality. Patient demographics, co-morbidities, admission level disease severity (estimated with CRP) and frailty (using the Clinical Frailty Scale, score 1–3 = not frail, score 4–9 = frail) were collected. A Cox proportional hazards regression model was used to assess the time to mortality. Results A total of 693 (N = 429, wave 1; N = 264, wave 2) patients were included, 279 (N = 180, 42%, wave 1; N = 104, 38%, wave 2) were female, and the median age was 72 in wave 1 and 73 in wave 2. 318 (N = 212, 49%, wave 1; N = 106, 39%, wave 2) patients presenting were frail. There was a reduction in mortality in wave 2, adjusted Hazard ratio (aHR) = 0.60 (95%CI 0.44–0.81; p = 0.001). There was an association between frailty and mortality aHR = 1.57 (95%CI 1.09–2.26; p = 0.015). Conclusion Frailty is highly prevalent amongst patients of all ages admitted to SRFT with COVID-19. Higher scores of frailty are associated with increased mortality.
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8

Singh, Bhim, and Ram Niwas. "Single-Phase Power Generation Using Three-Phase Self-Excited Synchronous Reluctance Generator." International Journal of Emerging Electric Power Systems 15, no. 4 (August 1, 2014): 377–88. http://dx.doi.org/10.1515/ijeeps-2014-0006.

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Abstract This paper presents the single-phase power generation using a three-phase synchronous reluctance generator (SyRG) for a standalone diesel generator (DG) set based standalone supply system. A static compensator (STATCOM) is used for voltage control, harmonics reduction and load balancing on SyRG. The proposed system consists of a SyRG, a variable frequency drive of an induction motor used as a prototype of diesel engine (DE), a STATCOM and single-phase loads. The proposed system feeds single-phase loads in rural areas and telecom towers. The synchronous reference frame theory (SRFT)–based control algorithm is used for the control of STATCOM used for voltage control and load balancing of SyRG.
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9

Khan, A., F. R. Espinoza, T. Kneen, A. Dafnis, H. Allafi, B. Carter, M. Narro-Vidal, et al. "466 PREVALENCE AND IMPACT OF FRAILTY IN PATIENTS HOSPITALISED WITH COVID-19. THE SALFORD EXPERIENCE IN WAVES 1 AND 2." Age and Ageing 50, Supplement_2 (June 2021): ii14—ii18. http://dx.doi.org/10.1093/ageing/afab119.08.

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Анотація:
Abstract Introduction The COVID-19 pandemic has had an extensive impact on the frail older population, with significant rates of COVID-related hospital admissions and deaths amongst this vulnerable group. There is little evidence comparing the prevalence and impact of frailty amongst patients hospitalised with COVID-19 in wave 1 vs wave 2 of the pandemic. Methods Prospective observational study of all consecutive patients admitted to Salford Royal NHS Foundation Trust (SRFT) between 27th February and 28th of April 2020 (wave 1), and 1st October to 10th November 2020 (wave 2) with a diagnosis of COVID-19. The primary endpoint was in-hospital mortality. Patient demographics, co-morbidities, biochemical parameters, and frailty (using the Clinical Frailty Scale, score 1–4 = not frail, score 5–9 = frail) were collected. A Cox proportional hazards model associating wave and frailty with mortality was used. A logistic regression model was used to associate patient characteristics with wave. Both models adjusted for patient characteristics. Results A total of 700 patients were included (N = 429, wave 1; N = 271, wave 2). In wave 1, 42% (N = 180) were female; median age was 72; 37% (N = 160) were non-survivors, 49% (N = 212) were frail (CFS 5–9). In wave 2, 38% (N = 104) were female; median age was 73; 30% (N = 80) were non-survivors, 39% (N = 106) were frail. There was a reduction in mortality in wave 2, aHR = 0.71 (95% CI 0.53–0.94). Frailty was associated with increased mortality, after adjustment for age, wave and other patient characteristics. Patients were more frail in wave 1, and the effect of frailty was more pronounced in wave 1 vs wave 2. Conclusion Frailty is highly prevalent amongst patients of all ages admitted to SRFT with COVID-19. Higher scores of frailty are associated with increased mortality.
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10

Kareem, Semiu A., Idayatu Dere, Daniel T. Gungula, Fartisincha Peingurta Andrew, Abdullahi M. Saddiq, Elizabeth F. Adebayo, Vadlya T. Tame, Haruna M. Kefas, Japari Joseph, and David O. Patrick. "Synthesis and Characterization of Slow-Release Fertilizer Hydrogel Based on Hydroxy Propyl Methyl Cellulose, Polyvinyl Alcohol, Glycerol and Blended Paper." Gels 7, no. 4 (December 13, 2021): 262. http://dx.doi.org/10.3390/gels7040262.

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Анотація:
In this study, biodegradable slow-release fertilizer (SRF) hydrogels were synthesized from hydroxyl propyl methyl cellulose (HPMC), polyvinyl alcohol (PVA), glycerol and urea (SRF1) and HPMC, PVA, glycerol, urea and blended paper (SRF2). The fertilizer hydrogels were characterized by SEM, XRD and FTIR. The swelling capacity of the hydrogels in both distilled and tap water as well as their water retention capacity in sandy soil were evaluated. The hydrogels had good swelling capacity with maximum swelling ratio of 17.2 g/g and 15.6 g/g for SRF1 and SRF2 in distilled, and 14.4 g/g and 15.2 g/g in tap water, respectively. The water retention capacity of the hydrogels in sandy soil exhibited higher water retention when compared with soil without the (SRFs). The soil with the hydrogels was found to have higher water retention than the soil without the hydrogels. The slow-release profile of the hydrogels was also evaluated. The result suggested that the prepared fertilizer hydrogels has a good controlled release capacity. The blended paper component in SRF2 was observed to aid effective release of urea, with about 87.01% release in soil at 44 days compared to the pure urea which was about 97% release within 4 days. The addition of blended paper as a second layer matrix was found to help improve the release properties of the fertilizer. The swelling kinetic of the hydrogel followed Schott’s second order model. The release kinetics of urea in water was best described by Kormeye Peppas, suggesting urea release to be by diffusion via the pores and channels of the SRF, which can be controlled by changing the swelling of the SRF. However, the release mechanism in soil is best described by first order kinetic model, suggesting that the release rate in soil is depended on concentration and probably on diffusion rate via the pores and channels of the SRF.
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Більше джерел

Дисертації з теми "SRFT"

1

Smith, Gemma Ann. "Regulation of SRF activity." Thesis, University College London (University of London), 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.404483.

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2

Matsushima, Aki. "Transverse laser cooling of SrF." Thesis, Imperial College London, 2014. http://hdl.handle.net/10044/1/17839.

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Анотація:
This thesis discusses an experiment, which has demonstrated transverse laser cooling of a pulsed supersonic beam of strontium monofluoride (SrF) molecules. Producing ultracold molecules is important because they could advance many fields including many-body physics, quantum chemistry and precision measurements to explore fundamental forces in nature. Direct laser cooling of molecules is a new and promising way to produce molecules with temperatures in the sub-millikelvin range. In the experiment, SrF molecules produced from a pulsed supersonic source were cooled in the transverse direction using light from just two lasers. The molecular beam brightness was increased by about 20%. I discuss the detailed experimental setup, laser system and data analysis. I also present several theoretical models, which give insight into the cooling experiment. Finally, I discuss improvements to this experiment, which should enable higher yields of ultracold molecules to be produced.
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3

Vennekate, Hannes. "Emittance Compensation for SRF Photoinjectors." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2017. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-229164.

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The advantages of contemporary particle injectors are high bunch charges and good beam quality in the case of normal conducting RF guns and increased repetition rates in the one of DC injectors. The technological edge of the concept of superconducting radio frequency injectors is to combine the strengths of both these sides. As many future accelerator concepts, such as energy recovery linacs, high power free electron lasers and certain collider designs, demand particle sources with high bunch charges and high repetition rates combined, applying the superconductivity of the accelerator modules to the injector itself is the next logical step. However, emittance compensation — the cornerstone for high beam quality — in case of a superconducting injector is much more challenging than in the normal conducting one. The use of simple electromagnets generating a solenoid field around the gun’s resonator interferes with its superconducting state. Hence, it requires novel and sophisticated techniques to maintain the high energy gain inside the gun cavity, while at the same time alleviating the detrimental fast transverse emittance growth of the bunch. In the case of the ELBE accelerator at the Helmholtz-Zentrum Dresden-Rossendorf, a superconducting electron accelerator provides beam for several independent beamlines in continuous wave mode. The applications include IR to THz free electron lasers, neutron and positron generation, to Thompson backscattering with an inhouse TW laser, and hence, call for a flexible CW injector. Therefore, the development of a 3.5 cell superconducting electron gun was initiated in 1997. The focus of this thesis lies on three approaches of transverse emittance compensation for this photoinjector: RF focusing, the installation of a superconducting solenoid close to the cavity’s exit, and the introduction of a transverse electrical mode of the RF field in the resonator. All three methods are described in theory, examined by numerical simulation, and experimentally reviewed in the particular case of the ELBE SRF Gun II at HZDR and a copy of its niobium resonator at Thomas Jefferson National Laboratory, Newport News, VA, USA.
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4

Zaromytidou, Alexia Ileana. "Molecular study of SRF-cofactor interactions." Thesis, University College London (University of London), 2008. http://discovery.ucl.ac.uk/1445165/.

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Serum Response Factor regulates a large array of genes involved in diverse processes including cell proliferation, muscle differentiation and development, and cytoskeletal processes such as cell migration and adhesion. The specificity and versatility of the SRF responses is achieved by combinatorial interactions with accessory factors. SRF binds to the CC(A/T)2A(A/T)3GG CArG box consensus sequence within the promoters of its target genes and acts as a docking platform for diverse signal regulated and cell- type specific cofactors to elicit their distinct responses. In fibroblasts two pathways signal through SRF in a mutually exclusive manner. MAP kinase signalling results in transcriptional activation of a subset of SRF target genes, via the interaction of SRF with members of the TCF family of Ets domain proteins. In contrast Rho-signalling induced changes in actin dynamics result in the association of SRF with members of the Myocardin-related family of SRF cofactors (MAL/MRTF-A/MKL1 and MAL16/MRTF-B/MKL2). The results described in this thesis characterise the molecular mechanism of MAL-SRF complex formation. MAL binds SRF as a dimer via a seven-residue core sequence within the MAL B1 region. Residues in the neighbouring Q-box enhance MAL-SRF complex formation, although these do not contact SRF directly. The MAL-SRF interaction displays the properties of a Rho-regulated cofactor. MAL competes with TCF for SRF binding due to the interaction of both cofactors with the same hydrophobic groove and pocket on SRF. In contrast to TCF, MAL-SRF complex formation depends on the intact N-terminus of the SRF DNA-binding domain. Mutations in the SRF al-helix that reduce DNA bending also impair complex formation with MAL. These mutations however do not affect DNA distortion in the MAL-SRF complex. Efficient MAL-SRF complex formation requires that SRF be bound to its cognate DNA and that MAL directly contacts DNA on either side of the CArG box. My results support a model in which each MAL monomer adds a p-strand consisting of the core B1 sequence, to the p-sheet of the SRF DNA-binding domain in a similar way to TCF, while also making direct DNA contacts in the ternary complex facilitated by SRF- induced DNA distortion. My analysis of complex formation between MAL and SRF demonstrates that members of the MRTF and TCF families of SRF cofactors interact with SRF using related but distinct mechanisms, thus providing a molecular rationale for their mutually exclusive transcriptional responses and the specificity of signalling to SRF.
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5

Valente-Feliciano, Anne-Marie. "Development of SRF monolayer/multilayer thin film materials to increase the performance of SRF accelerating structures beyond bulk Nb." Thesis, Paris 11, 2014. http://www.theses.fr/2014PA112254/document.

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Анотація:
La réduction du cout de construction et d’exploitation des futurs accélérateurs d particules, a grande et petite échelles, dépend du développement de nouveaux matériaux pour les surfaces actives des structures supraconductrices en radiofréquence (SRF). Les propriétés SRF sont essentiellement un phénomène de surface vu que la profondeur de pénétration (profondeur de pénétration de London, λ) des micro-ondes (RF) est typiquement de l’ordre de 20 à 400 nm en fonction du matériau. Lorsque les procédés de préparation de surface sont optimises, la limite fondamentale du champ RF que les surfaces SRF peuvent supporter est le champ RF maximum, Hc₁, au-delà duquel le flux magnétique commence à pénétrer la surface du supraconducteur. Le matériau le plus utilise pour des applications SRF est le niobium (Nb) massif, avec un champ Hc₁ de l’ordre de 170 mT, qui permet d’atteindre un champ accélérateur de moins de 50 MV/m. Les meilleures perspectives d’amélioration des performances des cavités SRF sont liées à des matériaux et méthodes de production produisant la surface SRF critique de façon contrôlée. Dans cette optique, deux avenues sont explorées pour utiliser des couches minces pour augmenter les performances des structures SRF au-delà du Nb massif, en monocouche ou en structures multicouches Supraconducteur-Isolant-Supraconducteur (SIS) : La première approche est d’utiliser une couche de Nb déposée sur du cuivre (Nb/Cu) à la place du Nb massif. La technologie Nb/Cu a démontré, au cours des années, être une alternative viable pour les cavités SRF. Toutefois, les techniques de dépôt communément utilisées, principalement la pulvérisation magnétron, n’ont jusqu’à présent pas permis de produire des surfaces SRF adaptées aux performances requises. Le récent développement de techniques de dépôt par condensation énergétiques, produisant des flux d’ions énergétiques de façon contrôlée (telles que des sources d’ions ECR sous ultravide) ouvrent la voie au développement de films SRF de grand qualité. La corrélation entre les conditions de croissance, l’énergie des ions incidents, la structure et les performances RF des films produits est étudiée. Des films Nb avec des propriétés proches du Nb massif sont ainsi produits. La deuxième approche est basée sur un concept qui propose qu’une structure multicouche SIS déposée sur une surface de Nb peut atteindre des performances supérieures à celles du Nb massif. Bien que les matériaux supraconducteurs à haute Tc aient un champ Hc₁ inférieur à celui du Nb, des couches minces de tels matériaux d’une épaisseur (d) inférieure à la profondeur de pénétration voient une augmentation de leur champ parallèle Hc₁ résultant au retardement de la pénétration du flux magnétique. Cette surcouche peut ainsi permettre l’écrantage magnétique de la surface de Nb qui est donc maintenue dans l’état de Meissner à des champs RF bien plus importants que pour le Nb massif. La croissance et performance de structures multicouches SIS basées sur des films de NbTiN, pour le supraconducteur, et de l’AlN, pour le diélectrique, sont étudiées. Les résultats de cette étude montrent la faisabilité de cette approche et le potentiel qui en découle pour l’amélioration des performances SRF au-delà du Nb massif
The minimization of cost and energy consumption of future particle accelerators, both large and small, depends upon the development of new materials for the active surfaces of superconducting RF (SRF) accelerating structures. SRF properties are inherently a surface phenomenon as the RF only penetrates the London penetration depth λ, typically between 20 and 400 nm depending on the material. When other technological processes are optimized, the fundamental limit to the maximum supportable RF field amplitude is understood to be the field at which the magnetic flux first penetrates into the surface, Hc₁. Niobium, the material most exploited for SRF accelerator applications, has Hc₁~170 mT, which yields a maximum accelerating gradient of less than 50 MV/m. The greatest potential for dramatic new performance capabilities lies with methods and materials which deliberately produce the sub-micron-thick critical surface layer in a controlled way. In this context, two avenues are pursued for the use of SRF thin films as single layer superconductor or multilayer Superconductor-Insulator-Superconductor structures: Niobium on copper (Nb/Cu) technology for superconducting cavities has proven over the years to be a viable alternative to bulk niobium. However the deposition techniques used for cavities, mainly magnetron sputtering, have not yielded, so far, SRF surfaces suitable for high field performance. High quality films can be grown using methods of energetic condensation, such as Electron Cyclotron Resonance (ECR) Nb ion source in UHV which produce higher flux of ions with controllable incident angle and kinetic energy. The relationship between growth conditions, film microstructure and RF performance is studied. Nb films with unprecedented “bulk-like” properties are produced. The second approach is based on the proposition that a Superconductor/Insulator/Superconductor (S-I-S) multilayer film structure deposited on an Nb surface can achieve performance in excess of that of bulk Nb. Although, many higher-Tc superconducting compounds have Hc₁ lower than niobium, thin films of such compounds with a thickness (d) less than the penetration depth can exhibit an increase of the parallel Hc₁ thus delaying vortex entry. This overlayer provides magnetic screening of the underlying Nb which can then remain in the Meissner state at fields much higher than in bulk Nb. A proof of concept is developed based on NbTiN and AlN thin films. The growth of NbTiN and AlN films is studied and NbTiN-based multilayer structures deposited on Nb surfaces are characterized. The results from this work provide insight for the pursuit of major reductions in both capital and operating costs associated with future particle accelerators across the spectrum from low footprint compact machines to energy frontier facilities
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6

Kolb, Philipp Ulrich. "The TRIUMF nine-cell SRF cavity for ARIEL." Thesis, University of British Columbia, 2016. http://hdl.handle.net/2429/57725.

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Modern physics research relies on particle accelerators and available beam time is a very limited resource. The ARIEL eLINAC will strengthen the rare isotope program at TRIUMF by providing an alternative way to create rare isotope beams (RIB). A possible way to add additional use to this machine is to create a return beam line and use the beam to excite a free electron laser (FEL). The remaining beam can be used to drive fields in the SRF cavities to reduce the required RF power. One limitation of these energy recovery LINACs (ERL) is beam-break up. Higher order modes (HOM), especially dipole modes, have a negative influence on the beam which can lead to beam loss. The design of the SRF cavity has to accommodate this to make sure a beam current of up to 10mA can be used for both RIB production and ERL operation. This thesis will go through the design process of the ARIEL 1.3 GHz nine-cell cavity. The design relies on simulations to calculate the fields inside the cavity and with it the shunt impedance of HOMs. The investigations showed that resistive beam line absorbers can be used to reduce the shunt impedance of HOMs sufficiently without interfering with the accelerating mode. The performance of the absorber material has been verified in dedicated low temperature measurements, while the HOM field distribution has been measured via beadpulling on a copper model of the cavity. These measurements showed good agreement with the simulations. The power dissipation in the SRF cavities is of vital importance. The cryogenic system is a signicant part of the capital investment for the accelerator and sets the power budget for each cavity to around 10 W. This corresponds to a Q₀ value of 1 x 10¹⁰ at an operational temperature of 2 K. The gradient goal is 10 MV/m to reach the design energy of 50 MeV with five cavities. Both Q₀ and Eacc specifications have been met in the first two cavities that are installed in cryomodules. Two more cavities have been built and are in their qualification phase.
Science, Faculty of
Physics and Astronomy, Department of
Graduate
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7

Guettler, Sebastian. "Regulation of the SRF cofactor MAL by actin." Thesis, University College London (University of London), 2007. http://discovery.ucl.ac.uk/1445537/.

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Serum Response Factor (SRF) is controlled by actin dynamics at many of its target genes: Rho-induced depletion of G-actin is sensed by MAL, a member of the myocardin family of SRF coactivators. MAL binds G-actin via its N-terminus, the "RPEL domain", containing three RPEL motifs. MAL rapidly circulates between nucleus and cytoplasm in resting NIH3T3 fibroblasts. It accumulates in the nucleus and activates SRF upon serum stimulation, which alters interactions between G-actin and the RPEL domain. In contrast, myocardin (MC) itself is constitutively nuclear and active when expressed in fibroblasts, suggesting that it is not controlled through Rho. This thesis addresses the mode and functions of actin binding by myocardin-family proteins. Actin binding targets MAL for efficient CRM1-mediated nuclear export. Nuclear accumulation of MAL is not sufficient for activation of SRF-mediated transcription unless an inhibitory MAL-actin interaction in the nucleus is released. Actin therefore fulfils a dual role in MAL regulation by controlling MAL localisation as well as activity. The MAL RPEL domain is sufficient to confer actin-regulated nucleocytoplasmic trafficking and binds multiple actin molecules, efficiently sequestering them from polymerisation. Actin-binding toxins directly interfere with the MAL-actin complex. The RPEL motif represents an actin-binding unit: affinities of MAL RPEL motifs 1 and 2 for actin are relatively high while RPEL3 binds actin weakly. RPEL motifs cooperate to regulate MAL. The regulatory contribution of an RPEL3-actin interaction depends on actin binding by the RPEL 1-2 unit, differences in which account for differential regulation of MAL and MC, which binds actin weakly. A model of MAL regulation by differential actin occupancy of multiple RPEL motifs is proposed. Crystal structures of MAL RPEL motifs 1 and 2 bound to G-actin were obtained. RPEL motifs maintain hydrophobic interactions with a hydrophobic cleft at the subdomain 1-3 interface of actin and a "platform" on subdomain 3, both at the "base" of the actin molecule in its conventional view (Kabsch et al., 1990). The RPEL motif also establishes critical polar interactions with actin. Conservation of the RPEL motif reflects actin binding. The structures rationalise RPEL-actin affinities and competition of actin-binding toxins and profilin with MAL. A crystal structure of the MAL RPEL domain bound to three actin molecules revealed an additional actin-binding site within the RPEL 1-2 linker and actin-actin contacts in the RPEL domain-actin complex.
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8

Xiao, Binping. "Surface Impedance of Superconducting Radio Frequency (SRF) Materials." W&M ScholarWorks, 2012. https://scholarworks.wm.edu/etd/1539623605.

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Superconducting radio frequency (SRF) technology is widely adopted in particle accelerators. There remain many open questions, however, in developing a systematic understanding of the fundamental behavior of SRF materials, including niobium treated in different ways and various other bulk/thin film materials that are fabricated with different methods under assorted conditions. A facility that can measure the SRF properties of small samples in a range of 2∼40 K temperature is needed in order to fully answer these questions. The Jefferson Lab surface impedance characterization (SIC) system has been designed to attempt to meet this requirement. It consists of a sapphire-loaded cylindrical Nb TE011 cavity at 7.4 GHz with a 50 mm diameter flat sample placed on a non-contacting end plate and uses a calorimetric technique to measure the radio frequency (RF) induced heat on the sample. Driving the resonance to a known field on this surface enables one to derive the surface resistance of a relatively small localized area. TE011 mode identification has been done at room temperature and 4 K, and has been compared with Microwave StudioRTM and SuperFish simulation results. RF loss mechanisms in the SIC system are under investigation. A VCO phase lock loop system has been used in both CW and pulsed mode. Two calorimeters, with stainless steel and Cu as the thermal path material for high precision and high power versions, respectively, have been designed and commissioned for the SIC system to provide low temperature control and measurement. A power compensation method has been developed to measure the RF induced power on the sample. Simulation and experimental results show that with these two calorimeters, the whole thermal range of interest for SRF materials has been covered, The power measurement error in the interested power range is within 1.2% and 2.7% for the high precision and high power versions, respectively. Temperature distributions on the sample surface for both versions have been simulated and the accuracy of sample temperature measurements have been analysed. Both versions have the ability to accept bulk superconductors and thin film superconducting samples with a variety of substrate materials such as Al, A12O3, Cu, MgO, Nb and Si. Tests with polycrystalline and large grain bulk Nb samples have been done at impedance, least-squares fittings have been done using SuperFit2.0, a code developed by G. Ciovati and the author.;Microstructure analyses and SRF measurements of large scale epitaxial MgB2 films have been reported. MgB2 films on 5 cm dia. sapphire disks were fabricated by a Hybrid Physical Chemical Vapor Deposition (HPCVD) technique. The electron-beam backscattering diffraction (EBSD) results suggest that the film is a single crystal complying with a MgB2(0001)//A1 2O3(0001) epitaxial relationship. The SRF properties of different film thicknesses (200 nm and 350 nm) were evaluated using SIC system under different temperatures and applied fields at 7.4 GHz. A surface resistance of 9+/-2 muO has been observed at 2.2 K.;Based on BCS theory with moving Cooper pairs, the electron states distribution at 0K and the probability of electron occupation with finite temperature have been derived and applied to anomalous skin effect theory to obtain the surface impedance of a superconductor with moving Cooper pairs. We present the numerical results for Nb.
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9

Gualdrini, F. "Mechanisms of transcriptional regulation by SRF co-factors." Thesis, University College London (University of London), 2015. http://discovery.ucl.ac.uk/1460723/.

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Serum response factor (SRF) controls gene activation in response to changes in actin dynamics and mitogen-activated protein kinases. SRF has low intrinsic transcriptional activity and requires the recruitment of one of two families of co-activators: the MRTFs (myocardin-related transcription factors) and the TCFs (ternary complex factors). MRTFs are actin-binding proteins. Disruption of the actin-MRTF interaction is sufficient to induce MRTF nuclear accumulation and transcriptional activation. The TCF family are specifically activated by MAPK signalling. This thesis aims to elucidate how the SRF transcription network is controlled. The work presented encompasses two projects focused on each of the co-activator families. The regulation of MRTF shuttling from the cytoplasm to the nucleus is relatively well understood while its regulation once in the nucleus is still uncharacterized. The work demonstrates that nuclear MRTF activities are influenced by nuclear actin. Nuclear actin interferes with MRTF-DNA binding and target gene activation. In the presence of G-actin, nuclear MRTF can associate with target loci and recruit Pol II that, although traverses the gene body, does not generate stable mRNA. This inhibited state is accompanied by hypo-phosphorylation of the Pol II CTD. Dissociation of MRTF-actin interaction is required to re-establish Pol II phosphorylation and mRNA accumulation. The Erk-TCF signalling pathway was used to investigate how chromatin signatures are established in response to cues. Fibroblasts lacking all three TCFs, or reconstituted with mutant derivatives of the Elk-1 TCF were generated. Following Erk activation, chromatin immunoprecipitation and RNA-sequencing techniques, were employed to study the role of the TCFs in chromatin changes and transcriptional activation. It was possible to show that signal-induced chromatin changes occur in absence of transcription, and the specific chromatin signature requires Elk-1 DNA binding and phosphorylation. In addition analysis of the H3K27me3 mark demonstrated that Elk-1 activation is required to maintain a permissive chromatin landscape.
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10

Fortier-Topping, Hugo. "Conception d'une chambre de combustion pour la microturbine à gaz SRGT-2." Mémoire, Université de Sherbrooke, 2014. http://hdl.handle.net/11143/5417.

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Dans un contexte mondial où les ressources énergétiques commencent à se faire rares, beaucoup de recherches se font sur l’amélioration de l’efficacité thermique et de la densité de puissance des sources d’énergie existantes. Ainsi, un projet de développement d’une microturbine à gaz avec une architecture de nouveau genre permettant d’augmenter la densité de puissance tout en réduisant les coûts a vu le jour. La recherche proposée dans le présent document se concentre sur la conception et la caractérisation d’une chambre de combustion et d’un banc d’essai pour la turbine SRGT-2. Une chambre de combustion à écoulement inverse est conçue et caractérisée expérimentalement. Un modèle 0D de la chambre est tout d’abord fait. Par la suite, une optimisation numérique est faite jusqu’à l’atteinte des objectifs de conception. Finalement, la chambre de combustion est testée durant 30 secondes avec de l’hydrogène comme carburant. Une température de sortie de la chambre de combustion de 1000 K a été maintenue avec une efficacité de combustion de plus de 85%. Le banc d’essai conçu pour le projet de recherche utilise un démarreur électropneumatique permettant d’accélérer le prototype jusqu’à 102 000 RPM. Le module fluide est la partie du banc d’essai qui contient les différentes parties de la turbine SRGT-2 comme le rotor, les stators et la chambre de combustion. Le module est instrumenté dans le but d’obtenir une caractérisation complète de la turbine. Sa configuration modulaire permet aussi de caractériser chacune des composantes individuellement en changeant certaines sections.
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Книги з теми "SRFT"

1

Šmoldas, Ivo. Zimní srst. Praha: Československý spisovatel, 1988.

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Taneski, Zvonko. Srt: Poema. Skopje: Magor, 2003.

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3

Dodge Viper SRT. Minneapolis, MN: Bellwether Media, 2016.

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4

Trust, Massachusetts Water Pollution Abatement. The Massachusetts SRF Program: An introduction. Boston]: The Trust, 1990.

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5

Yasadipura. Serat Nabi Musa: Kagungan Dalem Srat Musa kaliyan Ibrahim. [Jakarta]: Perpustakaan Nasional RI, 2003.

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6

Massachusetts. Dept. of Environmental Protection. Division of Municipal Services. Massachusetts clean water state revolving fund (SRF) program. Boston, Mass.]: Massachusetts Dept. of Environmental Protection, Division of Municipal Services, 1997.

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7

SRT diver: A guide for special response teams. Los Angeles, CA: S.T.T.U., 1989.

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8

Standard request for application (SRFA) for selection of individual consultant (national). Dhaka: Central Procurement Technical Unit, Implementation Monitoring and Evaluation Division, Ministry of Planning, 2004.

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9

Ashby, Steven F. The generalized SRT iteration for linear systems of equations. Urbana, IL (1304 W. Springfield Ave., Urbana 61801-2987): Dept. of Computer Science, University of Illinois at Urbana-Champaign, 1986.

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10

Marinho, Marcelo. Grnd srt ~: vertigens de um enigma: Vertigens de um enigma. Campo Grande, MS: Letra Livre Editora, 2001.

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Частини книг з теми "SRFT"

1

Posypaiko, V. I., and E. A. Alekseeva. "SrF2." In Phase Equilibria in Binary Halides, 392–93. Boston, MA: Springer US, 1987. http://dx.doi.org/10.1007/978-1-4684-9024-4_159.

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2

Sonne, Bernd, and Reinhard Weiß. "Zusammenfassung SRT." In Einsteins Theorien, 141–47. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-34765-8_11.

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3

Kumar, Pranish, Jasjit Singh Grewal, Bogdan Crivat, and Eric Lee. "Advanced SRF." In ATL Server: High Performance C++ on .NET, 261–72. Berkeley, CA: Apress, 2003. http://dx.doi.org/10.1007/978-1-4302-0768-9_17.

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4

Kumar, Pranish, Jasjit Singh Grewal, Bogdan Crivat, and Eric Lee. "SRF Files." In ATL Server: High Performance C++ on .NET, 21–32. Berkeley, CA: Apress, 2003. http://dx.doi.org/10.1007/978-1-4302-0768-9_2.

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5

Daly, E., Thomas H. Nicol, and J. Preble. "Segmented SRF Cryomodules." In Cryostat Design, 147–94. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-31150-0_6.

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6

Harchol-Balter, Mor, Nikhil Bansal, Bianca Schroeder, and Mukesh Agrawal. "SRPT Scheduling for Web Servers." In Job Scheduling Strategies for Parallel Processing, 11–20. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/3-540-45540-x_2.

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7

Boblest, Sebastian, Thomas Müller, and Günter Wunner. "Mathematischer Formalismus der SRT." In Spezielle und allgemeine Relativitätstheorie, 81–90. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-47767-0_5.

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8

Boblest, Sebastian, Thomas Müller, and Günter Wunner. "Visualisierung in der SRT." In Spezielle und allgemeine Relativitätstheorie, 153–67. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-47767-0_9.

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9

Sonne, Bernd. "Konsequenzen für Einsteins SRT." In Spezielle Relativitätstheorie für jedermann, 9–14. Wiesbaden: Springer Fachmedien Wiesbaden, 2016. http://dx.doi.org/10.1007/978-3-658-12777-0_3.

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10

Sonne, Bernd. "Konsequenzen für Einsteins SRT." In Spezielle Relativitätstheorie für jedermann, 13–18. Wiesbaden: Springer Fachmedien Wiesbaden, 2019. http://dx.doi.org/10.1007/978-3-658-28549-4_3.

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Тези доповідей конференцій з теми "SRFT"

1

Song, Zhi, Qing-fang Ren, Yan-bing Xue, and Yi-sheng Zhu. "Design of broadband antenna minimum mismatching network using SRFT." In Sixth International Conference on Electronics and Information Engineering, edited by Qiang Zhang. SPIE, 2015. http://dx.doi.org/10.1117/12.2205704.

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Pentakota, Aswini, Krishna Nag Arsavelli, and S. Ramana Kumar Joga. "Improved SRFT controller based Power Quality Improvement in EV integrated distribution system." In 2023 International Conference on Smart Systems for applications in Electrical Sciences (ICSSES). IEEE, 2023. http://dx.doi.org/10.1109/icsses58299.2023.10200075.

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K P, Anagha Rajendran, and Jayaprakash P. "Comparison of SRFT and ISOGI-QSG Control Algorithm for Grid Integrated SPV System." In 2019 2nd International Conference on Intelligent Computing, Instrumentation and Control Technologies (ICICICT). IEEE, 2019. http://dx.doi.org/10.1109/icicict46008.2019.8993130.

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4

Huan, Hui Yan, Narendra Kumar, Amir Effendy, T. A. Latef, and B. S. Yarman. "An 8-to-20 GHz Wideband Yttrium-Iron-Garnet Tuned Oscillator Design with SRFT Integration." In 2019 IEEE MTT-S International Microwave Workshop Series on Advanced Materials and Processes for RF and THz Applications (IMWS-AMP). IEEE, 2019. http://dx.doi.org/10.1109/imws-amp.2019.8880135.

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5

Bayaskar, Saraunsh, Paolo de Falco, and Taylor Barton. "A 2.4/3.5 GHz Dual-Band Power Amplifier with Filter-Based Bias Network and SRFT Matching." In 2020 50th European Microwave Conference (EuMC). IEEE, 2021. http://dx.doi.org/10.23919/eumc48046.2021.9338146.

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6

Labeeb, M., and B. S. Lathika. "Design and analysis of DSTATCOM using SRFT and ANN-fuzzy based control for power quality improvement." In 2011 IEEE Recent Advances in Intelligent Computational Systems (RAICS). IEEE, 2011. http://dx.doi.org/10.1109/raics.2011.6069317.

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7

Orlovskii, Yu V., T. T. Basiev, I. N. Vorob'ev, O. K. Alimov, A. G. Papashvili, and V. V. Osiko. "Site-selective measurements of nonradiative relaxation rates of 4G5/2+2G7/2 multiplet of Nd3+ ion in SrF2:Nd3+ and SrF 2 x : LaF 3 ( 1 − x ) : N d 3 + laser crystals." In The European Conference on Lasers and Electro-Optics. Washington, D.C.: Optica Publishing Group, 1994. http://dx.doi.org/10.1364/cleo_europe.1994.ctuk81.

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Here we present the results of investigation of the nonradiative relaxation (NR) rates dependence of the strongly quenched (A ≪ WNR) high-lying 4G5/2 + 2G7/2- multiplet of the Nd30+-ion from the excitation wavelength in the multicenter (SrF2) and disordered ( SrF 2 x : LaF 3 ( 1 − x ) ) laser crystals.
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8

Fyffe, John R., Aaron K. Townsend, and Michael E. Webber. "Methodology for Comparing End-of-Life Pathways for Non-Recycled Materials." In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-64131.

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Recycling plastics is widely accepted as the most beneficial end use of plastic products. Consequently, many cities are turning towards single-stream recycling to make it easier for consumers to recycle and to increase the total amount of municipal solid waste (in particular, energy-dense plastic waste) that is diverted to recycling facilities. However, single-stream recycling Materials Recovery Facilities (MRFs) are now faced with sorting more diverse material flows with increased contamination from the mixing of recyclable and non-recyclable materials, leading to roughly 5–10% of the incoming material being sent to landfills. Converting the energy dense MRF waste material into solid recovery fuel (SRF) pellets creates an additional use for the products, diverts the material from the landfill, and displaces some fossil fuel use. However, there are some non-obvious energetic and environmental tradeoffs that require analysis to quantify. That is the intent of the research presented here. To analyze the potential of SRFs as viable alternative fuel sources, a first-order thermodynamic materials and energy balance was constructed using cement kilns as a test-bed. The proposed methodology allows for a range of traditional fuels to be compared with and without supplemental SRF. The SRF case can be benchmarked against the reference case, or conventional plastic end-of-life pathway, landfilling of the non-recycled plastic. The comparison includes transportation and processing steps required for each pathway, including any additional sorting needed for creating the SRF as well as the pelletization process itself. A robust methodology was created that allows for the MRF residue to be adjusted on a compositional basis because residue composition varies by season and location, which affects the analysis. Additionally, proximity to SRF conversion facilities and cement kilns will vary for each MRF and can impact the analysis so the methodology allows these factors to be adjusted. A test case was studied to compare the landfilling or combustion of MRF residue in a cement kiln at a rate of 0.9 metric tons per hour (7884 metric tons for a one year period). The analysis details the total energy consumed, landfill avoidance, amount of fuel displaced, and the total equivalent CO2 emissions of each scenario. The methodology successfully models the reference and SRF case and is robust enough to be used with a wide variety of potential SRF scenarios. A few parametric studies were performed on the transportation and landfill variables to determine their relative effect on results. It was found that additional transportation would have minimal effect of total energy consumption. When using SRF as a supplementary cement kiln fuel, the equivalent CO2 reductions are higher in scenarios with low methane capture efficiency at the landfill. Overall, it was found that using SRF as a supplementary fuel at cement kilns reduces the total fossil energy consumption and total equivalent CO2 reductions by 6% and 76%, respectively.
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9

Zheng, Xinqian, Yangjun Zhang, Mingyang Yang, Takahiro Bamba, and Hideaki Tamaki. "Stability Improvement of High-Pressure-Ratio Turbocharger Centrifugal Compressor by Asymmetric Flow Control: Part II—Non-Axisymmetric Self Recirculation Casing Treatment." In ASME Turbo Expo 2010: Power for Land, Sea, and Air. ASMEDC, 2010. http://dx.doi.org/10.1115/gt2010-22582.

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This is the Part II of a two-part paper involving the development of asymmetric flow control method to widen the operating range of a turbocharger centrifugal compressor with high-pressure-ratio. Non-axisymmetric Self Recirculation Casing Treatment (SRCT) as an instance of asymmetric flow control method is presented. Experimental and numerical methods were used to investigate the impact of non-axisymmetric SRCT on surge point of the centrifugal compressor. Firstly, the influence of the geometry of a symmetric SRCT on the compressor performance was studied by means of numerical simulation. The key parameter of the SRCT was found to be the distance from the main blade leading edge to the rear groove (Sr). Next, several arrangements of a non-axisymmetric SRCT were designed, based on flow analysis presented in Part I. Then, a series of experiments was carried out to analyze the influence of non-axisymmetric SRCT on the compressor performance. Results show that the non-axisymmetry SRCT has certain influence on performance and has a larger potential for stability improvement than the traditional symmetric SRCT. For the investigated SRCT, the surge flow rate of the compressor with the non-axisymmetric SRCT is about 10% lower than that of the compressor with symmetric SRCT. The largest surge margin (smallest surge flow rate) can be obtained when the phase of the largest Sr is coincident with the phase of the minimum static pressure in the vicinity of the leading edge of the splitter blades.
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10

Šulc, J., H. Jelínková, M. E. Doroshenko, T. T. Basiev, V. A. Konyushkin, and P. P. Fedorov. "Tunability of Lasers Based on Yb3+-doped Fluorides SrF2, SrF2-CaF2, SrF2-BaF2, and YLF." In Advanced Solid-State Photonics. Washington, D.C.: OSA, 2009. http://dx.doi.org/10.1364/assp.2009.wb16.

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Звіти організацій з теми "SRFT"

1

Calaga R. and G. McIntyre. JLab SRF Institute (SRFI) Trip 8/31/04 ? 9/1/04: Final Report. Office of Scientific and Technical Information (OSTI), May 2005. http://dx.doi.org/10.2172/1061799.

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2

DOBOS, J. SRAT/SME Vessel. Office of Scientific and Technical Information (OSTI), April 2006. http://dx.doi.org/10.2172/890063.

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3

Shoop, Sally, Wendy Wieder, and Terry Melendy. McMurdo Snow Roads and Transportation : final program summary. Engineer Research and Development Center (U.S.), August 2022. http://dx.doi.org/10.21079/11681/45200.

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The snow roads at McMurdo Station, Antarctica, are the primary transportation corridors for moving personnel and material to and from the airfields servicing intra- and intercontinental air traffic. The majority of the road system is made of snow overlying a snow, firn, and icy subsurface and is particularly susceptible to deterioration during the warmest parts of the austral summer when above-freezing temperatures can occur for several days at a time. Poor snow-road conditions can seriously limit payloads for all types of ground vehicles. The US Army Cold Regions Research and Engineering Laboratory (CRREL) studied the McMurdo snow roads for the National Science Foundation Office of Polar Programs as part of the Snow Roads and Transportation (SRT) program. The goals of the SRT program was to improve construction, maintenance, and use of the McMurdo’s snow roads, with particular attention on minimizing warm-season deterioration. This is the final report of the SRT program, summarizing the program’s activities and findings and emphasizing those parts of the program not previously documented in CRREL Reports, conference papers, or journal articles.
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4

Hsu, C. W. Ammonium generation during SRAT cycle. Office of Scientific and Technical Information (OSTI), October 1992. http://dx.doi.org/10.2172/6447057.

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5

Hsu, C. W. Ammonium generation during SRAT cycle. Office of Scientific and Technical Information (OSTI), October 1992. http://dx.doi.org/10.2172/10161890.

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6

Bansal, Nikhil, and Mor Harchol-Balter. Analysis of SRPT Scheduling: Investigating Unfairness. Fort Belvoir, VA: Defense Technical Information Center, July 2000. http://dx.doi.org/10.21236/ada382309.

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7

EIBLING, R. IMPACT OF SIMULANT PRODUCTION METHODS ON SRAT PRODUCT. Office of Scientific and Technical Information (OSTI), March 2006. http://dx.doi.org/10.2172/890192.

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8

Thompson, Jessica Suzanne. Simulation of Conduction Cooled SRF Cavity. Office of Scientific and Technical Information (OSTI), August 2018. http://dx.doi.org/10.2172/1477991.

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9

Kuchnir, M., and J. Knobloch. Pump down rate for SRF cavities. Office of Scientific and Technical Information (OSTI), February 1992. http://dx.doi.org/10.2172/10137206.

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10

Thangaraj, Jayakar Charles. Compact SRF Accelerator Applications: USPAS Lecture. Office of Scientific and Technical Information (OSTI), June 2018. http://dx.doi.org/10.2172/1460787.

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