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Littérature scientifique sur le sujet « HZ. None of these, but in this section »

Auteur : Grafiati

Publié le 10 mars 2023

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Articles de revues sur le sujet "HZ. None of these, but in this section"

Figus, F., L. Idolazzi, P. Perić, A. Zabotti, I. Tinazzi, I. Azzolin, E. Montabone et al. « AB0765 CAN A 6-JOINT ULTRASOUND SCORE DIFFERENTIATE RHEUMATOID ARTHRITIS FROM PSORIATIC ARTHRITIS ? A CROSS SECTIONAL STUDY ». Annals of the Rheumatic Diseases 79, Suppl 1 (juin 2020) : 1680.2–1681. http://dx.doi.org/10.1136/annrheumdis-2020-eular.6394.

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Background:Ultrasonography (US) is a well established technique both for diagnosis and follow up in Rheumatoid Arthritis (RA) and Psoriatic Arthritis (PSA)1. To date, there is no consensus regarding a standardized US evaluation of joint involvement by a validated score to be used for differential diagnosis.Objectives:1) To differentiate the ultrasound features of patients affected by active RA or active PSA by using a 6-joints score2. 2) To analyze correlations between those findings and clinical patterns of PSA disease.Methods:68 RA and 38 PSA patients (divided in two equal subgroups according to the clinical involvement i.e. polyarticular or oligoarticular) were enrolled in a multi-center cross-sectional study. All patients underwent clinical evaluation including demographic data, disease characteristics, laboratory test and tender/swollen joints count. SDAI and DAPSA were calculated in accordance to the disease and standard of care. The sonographic evaluation of wrists, II MCFs and knees, was performed using a multifrequency linear probe (13-18 MHz) with power Doppler (7.5 MHz, PRF500 Hz). High-end equipment was used and the scanning technique as well as the lesion assessment was previously agreed among the participants, who performed a consensus session 100 images. A validated ultrasound score2, which included effusion, synovial hypertrophy and synovial hypervascularization at 6 joints sites was used. Those lesions were assessed according to OMERACT definitions and semi-quantitatively graded (0-3). By summing the scores obtained at each joint site and globally, a joint score for articular involvement, a score for the severity of each lesion and a global 6-joint score for all abnormalities were calculated.Results:Clinical evaluation showed no statistically significant differences between RA and PSA (table I). Ultrasound detected significant differences in the score of joint effusion (SE) (p<0.021), synovial hypertrophy (SH) (p<0.001) and Doppler signal (p<0.011) between oligoarticular PSA and RA. Significant differences in the joint score of II MCF (p<0.000) and wrist (p<0.032) were also found between oligoarticular PSA and RA. The global 6-joint score was 10,88 in RA, 6,05 in PSA oligoarticular, 16,32 in PSA polyarticular. No differences were found between RA and polyarticular PSA.Conclusion:Ultrasound evaluation of 6 target joints might help to discriminate RA and PSA oligoarticular subset. The study of a limited number of joints is therefore a complementary tool to the clinic, fast and well integrated into the overall assessment of the arthritic patient.References:[1]Zabotti A. et al. Clin Exp Rheumatol. 2018; 36:519-525.[2]Perricone C et al. Rheumatology (Oxford) 2012; 51:866-73.Table 1.Dependent variablesStudy Populationp valuesUS_SEScoreRAPSA OLIGO.021PSA POLY.356PSARA.021OLIGOPSA POLY.014PSARA.356POLYPSA OLIGO.014US_SHScoreRAPSA OLIGO.001PSA POLY.336PSARA.001OLIGOPSA POLY.004PSARA.336POLYPSA OLIGO.004US_PDScoreRAPSA OLIGO.011PSA POLY.102PSARA.011OLIGOPSA POLY.006PSA POLYRA.102PSA OLIGO.006US_MCP2ScoreRAPSA OLIGO.000PSA POLY.276PSARA.000OLIGOPSA POLY.002PSA POLYRA.276PSA OLIGO.002US_WRISTScoreRAPSA OLIGO.032PSA POLY.610PSARA.032OLIGOPSA POLY.047PSA POLYRA.610PSA OLIGO.047US_KNEEScoreRAPSA OLIGO1.000PSA POLY.133PSA OLIGORA1.000PSA POLY.180PSA POLYRA.133PSA OLIGO.180US_KNEEScoreRAPSA OLIGO1.000PSA POLY.133PSARA1.000OLIGOPSA POLY.180PSA POLYRA.133PSA OLIGO.180US: ultrasound; SE synovial effusion; SH synovial hypertrophy;PD power Doppler; MCP metacarpophalangeal; PSA psoriatic arthritis;OLIGO oligoarticular; POLYpolyarticularDisclosure of Interests:Fabiana Figus: None declared, Luca Idolazzi: None declared, Porin Perić: None declared, Alen Zabotti Speakers bureau: Celgene, Janssen, Ilaria Tinazzi: None declared, Irene Azzolin: None declared, ERIKA MONTABONE: None declared, Tanya Sapundzhieva: None declared, Anastas Batalov: None declared, PLAMEN TODOROV: None declared, Rositsa Karalilova: None declared, Annamaria Iagnocco Grant/research support from: Abbvie, MSD and Alfasigma, Consultant of: AbbVie, Abiogen, Alfasigma, Biogen, BMS, Celgene, Eli-Lilly, Janssen, MSD, Novartis, Sanofi and Sanofi Genzyme, Speakers bureau: AbbVie, Alfasigma, BMS, Eli-Lilly, Janssen, MSD, Novartis, Sanofi

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Ramírez-Arroyo, Gabriela, Rafael Jesús Salín Pascual et Mario Sergio Dávalos Fuentes. « Relevance of the voice in the process of gender affirmation in transsexual women : A cross-sectional study ». Salud mental 45, n^o 3 (9 juin 2022) : 115–23. http://dx.doi.org/10.17711/sm.0185-3325.2022.016.

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Introduction. Voice is a gender marker and can therefore be a source of gender dysphoria. There is a relationship between symptoms of anxiety and depression and voice-related difficulties in trans women (TW). Hormonal replacement treatment (HRT) in TW does not play a role in voice feminization. Access to voice feminization procedures is limited while the population demanding transgender healthcare is increasing. Objective. To describe the degree of voice-related dysphoria experienced by TW that seek a voice feminization treatment. Method. A descriptive, cross-sectional study, 26 TW completed quality of life (QoL) questionnaires and stated their reasons for seeking voice feminization. Fundamental frequency (f0) was measured. Results. 77% of the participants were legally recognized as women, 96% were under HRT, and 27% had a history of gender affirmation surgery. Median f0 for TW was 131 Hz. f0 had a poor correlation with QoL measures. The mean score in the Trans Women Voice Questionnaire was 95 (SD = 14.3). Achieving a feminine voice that allows gender conformity was the main reason for seeking treatment. Discussion and conclusion. Voice non-conformity affects QoL. None of the participants perceived their voice as feminine while 97% described their ideal voice as feminine. The inability to satisfy gender assurance needs has a detrimental effect on QoL. Improving access to affirmation procedures in public institutions without pathologization of transgender people is a pending agenda. Despite evidence that TW benefit from voice feminization treatments, it is difficult to define how to measure success.

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Torikai, E., Y. Hirano, D. Suzuki et Y. Kanayama. « AB0362 HERPES ZOSTER IN BARICITINIB-TREATED JAPANESE PATIENTS WITH RHEUMATOID ARTHRITIS USING REAL-WORLD CLINICAL DATA ». Annals of the Rheumatic Diseases 79, Suppl 1 (juin 2020) : 1482.1–1482. http://dx.doi.org/10.1136/annrheumdis-2020-eular.3023.

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Background:Similar to biologic disease-modifying anti-rheumatic drugs, the association between Janus kinase (JAK) inhibitors and infection is particularly interesting. The incidence of herpes zoster (HZ) among patients treated with JAK inhibitors is twofold to threefold higher in several regions of Asia (e.g., Japan and Korea) as compared with that observed in North America and Western Europe [1].Objectives:To evaluate the characteristics of patients who developed HZ during baricitinib treatment using real-world, multicenter, clinical data for Japanese population.Methods:The study enrolled 97 patients with rheumatoid arthritis (RA) who were treated with baricitinib therapy (68 biologic-naïve patients and 29 biologic-experienced patients) were enrolled in the study (observation period: 2–27 months). The severity of HZ infection was determined based on the extent of the rash and the presence or absence of organ damage. We evaluated the characteristics and clinical courses of patients who developed HZ.Results:Eight patients with HZ. The incidence ratio (IR) was 8.2 per patient-year. Patient data are described in Table 1 and Table 2. The IR was a little higher than that reported in clinical trials [2], which could be attributed to the high average age (i.e., 67.3 years) of the patients in this study. It was reported that adverse events occurred more frequently in elderly patients aged ≥65 years compared with younger patients [3]. The period from baricitinib administration to the onset of HZ varied between 2 months and 16 months. It is suggested that HZ may develop at any time during baricitinib therapy. There were no distinctive patient characteristics, except for age, at the time of initial baricitinib administration between patients who developed HZ and those who did not.Table 2.Response rates of non-medical Switch from Cellcept to MyforticCase- No.Age (years)Time (years) from RA onsetGenderFemale:FMale: M)BMIBari dose (mg/d)PSL(mg/d)MTX (mg/w)HZ historyNumber of prior biologics1741.5F25.64012No226133F19.2206No136111.1F23.64010Yes04730.5M23.3408Yes057421.9F20.9200No06781.2F19.8406No074823.2F24.1448No08795.0F22.422.54No0Table 1.Fatigue in NPSLE and non-NPSLE patients (N = 222)Case No.HZ incidence period after baricitinib administration (months)Priod of baricitinib withdrawal (weeks)Severity(Mild; MilModerate: Mod)1164Mod224Mod3131Mil431Mil586Mod634Mil ~ Mod733Mod820Discontinuation due to pateient’s choiceModNone of the patients had severe symptoms, and none of them experienced organ damage. All patients were cured with anti-viral agents. It should be noted that patients who had a history of HZ had milder symptoms than those who had no history of HZ. We noted an interesting finding in one patient (case 2). The half-life of baricitinib in the blood was very short (about 6 hours), and it is reported that the drug is almost fully excreted from the body 24 hours after its administration [4]. However, this patient developed an incidence of HZ at 17 days after the withdrawal of baricitinib for surgery management. Cells may take longer time to regain their original immune status even after excretion of the drug, especially, during intense stress such as in cases of surgical invasion.Conclusion:The HZ risk in Japanese patients with RA treated with baricitinib in real-world practice was high, especially in elderly patients. It is notable that HZ events were nonserious and that patients could restart baricitinib treatment after healing with antiviral therapy, for the most part.References:[1]Taylor PC et al. N Engl J Med. 2017;376:652-62[2]Harigai M et al. Mod Reumatol. 2019;20:1-8.[3]Fleischmann R et al. RMD open. 2017;3:e000546.[4]Shi JG et al. J Clin Pharmacol. 2014;54:1354-61Disclosure of Interests:Eiji Torikai: None declared, Yuji Hirano Speakers bureau: Tanabe-Mitsubishi, Pfizer, Eisai, Abbie, Chugai, Bristol-Meyers, Jansen, Astellas, UCB, Eli-Lilly, Asahikasei, Daiichi-Sankyo, Amgen, Daisuke Suzuki: None declared, Yasuhide Kanayama: None declared

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Ghazali, Mohamad Hazwan Mohd, Mohd Hafiz Zawawi, Nurul Husna Hassan, Mohd Rashid Mohd Radzi, Ahmad Zhafran Ahmad Mazlan, Mohamad Aizat Abas et Mohd Remy Rozainy Mohd Arif Zainol. « Structural Dynamic Analysis of the Chenderoh Dam Sector Gate Section ». MATEC Web of Conferences 217 (2018) : 02002. http://dx.doi.org/10.1051/matecconf/201821702002.

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The dynamic characteristics such as natural frequencies, mode shapes and frequency response function (FRF) are the important characteristics to be investigated to access the level of durability of any dam structures. These characteristics are important since it will be the reference information for any operational methods to be used for the dam structures. In this study, one of the real dam (i.e., Chenderoh Dam) that available in Malaysia is taken into consideration, where the dynamic analysis of the sector gate section of the dam structure is investigated. the real scale of the sector gate section is measured on site and modelled into the CAD software with the consideration of real build-in materials. Then, the finite element (FE) model is constructed in ANSYS software with the required boundary condition and meshing sensitivity analysis. From the result of modal analysis, 30 natural frequencies are determined in the range of 0.5904 Hz to 8.471 Hz together with the mode shapes but only the most significant natural frequencies will be shown in this paper. In addition, all three axes of the FRF graphs show an agreement for the highest natural frequency value at 7.95 Hz, where the maximum deflection occurred in x axis direction with 2.03 × 10-7 m.

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LANTERI, ANTONIO, et HIDETOSHI MAEDA. « Projective manifolds of sectional genus three as zero loci of sections of ample vector bundles ». Mathematical Proceedings of the Cambridge Philosophical Society 144, n^o 1 (janvier 2008) : 109–18. http://dx.doi.org/10.1017/s0305004107000813.

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AbstractLet ϵ be an ample vector bundle of rank r ≥ 2 on a smooth complex projective variety X of dimension n such that there exists a global section of ϵ whose zero locus Z is a smooth subvariety of dimension n-r ≥ 2 of X. Let H be an ample line bundle on X such that the restriction HZ of H to Z is very ample. Triplets (X, ϵ, H) with g(Z, HZ) = 3 are classified, where g(Z, HZ) is the sectional genus of (Z, HZ).

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Davis, T. L., et G. M. Jackson. « Reply by the authors to the Discussion by B. Biswas ». GEOPHYSICS 54, n^o 3 (mars 1989) : 406–7. http://dx.doi.org/10.1190/1.1486681.

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28 Hz geophones without a low‐cut filter provided a very similar amplitude (and phase) response to the 10 Hz geophones combined with a 25 Hz low‐cut filter. Combining 28 Hz geophones with a 15 or 20 Hz low‐cut filter would produce a record intermediate between Figure 4b and c. There is, however, a tradeoff between low‐frequency noise attenuation and the bandwidth of the seismic wavelet. Before stacking and deconvolution, the more severe low‐cut filtering produces dramatic noise reduction (Figure 4). After deconvolution and stacking, this improvement is much less dramatic. It was decided not to attenuate frequencies in the 10 to 25 Hz range too severely as this could decrease the signal bandwidth and provide a more “ringy,” if marginally cleaner, section.

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Wan, Yong, Menghua Li, Liangjun Chen, Yichao Wu, Jie Li, Hongbo Pan et Wei Zhong. « Effect of Final Electromagnetic Stirring Parameters on Central Cross-Sectional Carbon Concentration Distribution of High-Carbon Square Billet ». Metals 9, n^o 6 (7 juin 2019) : 665. http://dx.doi.org/10.3390/met9060665.

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The effect of final electromagnetic stirring parameters, with current intensity increasing from 300 A to 400 A and frequency increasing from 4 Hz to 12 Hz, on the electromagnetic forces and carbon concentration distribution of the central cross section of a 70 steel square billet have been studied. Along the center line of the liquid core zone, current intensity of 400 A and frequency of 8 Hz achieve the maximum electromagnetic force at the position 48 mm away from the billet edge among the 10 groups of stirring parameters. Nevertheless, along diagonal of the liquid core zone, the electromagnetic force near the diagonal center is the greatest and the current intensity of 280 A and frequency of 12 Hz obtain the maximum electromagnetic force. The optimal final electromagnetic stirring (F-EMS) parameter to uniform the central cross-sectional carbon concentration and minimize the center carbon segregation of 70 steel billet was obtained with a current intensity of 280 A and frequency of 12 Hz. Under this stirring parameter, the area ratios of carbon concentrations of 0.66 wt%, 0.70 wt% and 0.74 wt% in the middle of the billet cross section reached 28.5%, 56.9% and 10.9%, respectively. Moreover, the carbon segregation indexes for all sampling points were in the range of 0.92–1.05.

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Kang, Dong Ha, Byung Ok Kwak, A. Young Park et Han Wool Kim. « Clinical Manifestations of Herpes Zoster Associated with Complications in Children ». Children 8, n^o 10 (24 septembre 2021) : 845. http://dx.doi.org/10.3390/children8100845.

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Herpes zoster (HZ) is caused by latent varicella-zoster virus (VZV) reactivation when VZV-specific cell-mediated immunity declines. Information on HZ in children is limited. Therefore, we retrospectively investigated HZ’s clinical course and complications in children. We extracted the outpatient and hospitalization medical records of pediatric patients (<19 years) primarily diagnosed with HZ (ICD-10 B02 code) between January 2010 and November 2020. HZ was defined as a typical unilateral dermatomal vesicular rash where HZ was the treating physician’s primary diagnosis. Recognized HZ complications included combined bacterial skin infection, ophthalmic zoster, zoster oticus without facial paralysis, meningitis, and PHN. We identified 602 HZ cases, among which 54 developed HZ complications and were included in our analysis. The median age was 14.7 years, most patients were aged ≥13 years (42, 79%), and none were aged <4 years. Fifty-three were immunocompetent, and only one had systemic lupus erythematosus. The most frequent complication was zoster ophthalmicus (n = 26, 48%). HZ complications were also observed in immunocompetent or vaccinated children exhibiting a head or neck rash before and after VZV immunization. Current VZV vaccination programs may be insufficient in preventing HZ complications. Therefore, close varicella and HZ burden monitoring and the establishment of effective VZV vaccination programs are imperative.

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Perez-De-Arrilucea-Le-Floc’h, Unai A., Manuel Dote-Montero, Abraham Carle-Calo, Guillermo Sánchez-Delgado, Jonatan R. Ruiz et Francisco J. Amaro-Gahete. « Acute Effects of Whole-Body Electromyostimulation on Energy Expenditure at Resting and during Uphill Walking in Healthy Young Men ». Metabolites 12, n^o 9 (24 août 2022) : 781. http://dx.doi.org/10.3390/metabo12090781.

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The effects of the different electrical frequencies of whole-body electrical stimulation (WB-EMS) on energy expenditure (EE) and the respiratory exchange ratio (RER) remain poorly understood. This study aimed to determine the effects of different WB-EMS electrical frequencies on EE and the RER during supine resting and uphill walking. A total of 10 healthy and recreationally active men (21.6 ± 3.3 years old) participated in the present study. Participants completed two testing sessions in a randomized order. In each session, a variety of impulse frequencies (1 hertz (Hz), 2 Hz, 4 Hz, 6 Hz, 8 Hz, and 10 Hz) were applied in a randomized order, allowing a 10 min passive recovery between them. Oxygen consumption and carbon dioxide production were measured to calculate EE and the RER. All frequencies increased EE at rest (all p ≤ 0.001), with 4 Hz being the frequency producing the highest increase (Δ = 8.89 ± 1.49 kcal/min), as did 6 Hz (Δ = 8.05 ± 1.52 kcal/min) and 8 Hz (Δ = 7.04 ± 2.16 kcal/min). An increment in the RER at rest was observed with 4 Hz, 6 Hz, 8 Hz and 10 Hz (all p ≤ 0.016), but not with 1 Hz and 2 Hz (p ≥ 0.923). During uphill walking, the frequency that elicited the highest increase in EE was 6 Hz (Δ = 4.87 ± 0.84 kcal/min) compared to the unstimulated condition. None of the impulse frequencies altered the RER during uphill walking. WB-EMS increases EE in healthy young men both during resting and uphill walking.

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Siegmund, B., G. Y. Melmed, P. M. Irving, A. Pai, A. Patel, J. K. Sheffield, F. Caldera, B. A. C. Cree et M. C. Dubinsky. « P402 Incidence and outcomes of herpes zoster in the ozanimod phase, 3 ulcerative colitis and relapsing multiple sclerosis clinical program ». Journal of Crohn's and Colitis 16, Supplement_1 (1 janvier 2022) : i395—i396. http://dx.doi.org/10.1093/ecco-jcc/jjab232.529.

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Abstract Background Patients with ulcerative colitis (UC) and patients with multiple sclerosis (MS) have an elevated risk of developing herpes zoster (HZ), caused by reactivation of latent varicella zoster virus (VZV). Increased incidence of HZ has been reported with sphingosine, 1-phosphatase (S1P) receptor modulators. This analysis examined the number of patients who failed screening due to a lack of demonstrated VZV immunity and the incidence of HZ from completed phase, 3 ozanimod clinical trials. Methods Safety results were included from True North (52-week trial) in patients with UC, and SUNBEAM (12-month trial), and RADIANCE (24-month trial) in patients with MS. All patients were required to have had a positive VZV IgG antibody status or completed VZV vaccination ≥30 days prior to randomization based on known effects of S1P modulators. Patients with a negative VZV antibody titer could choose to receive the VZV vaccination to qualify for the trial. Number of pre-screen failures because of lack of demonstrated immunity, occurrence of HZ, and association between HZ cases and lymphopenia were analyzed. Results Of, 1831 patients with UC screened for VZV immunity, 104 (5.7%) failed screening due to lack of documentation of VZV antibody or VZV vaccination ≥30 days before randomization;, 22% (23/104) subsequently received varicella vaccination and were rescreened and enrolled. Of, 3332 MS patients tested for VZV immunity, 309 (9.3%) tested negative and, 32% (98/309) of these patients were vaccinated prior to randomization. In the UC and MS trials, the incidence of HZ cases was low in ozanimod-treated patients (8 cases [1.0%] and, 5 cases [0.6%], respectively; Table, 1). All cases were distributed across a single dermatome, did not result in a complication of HZ, and were treated with oral antivirals while patients remained on ozanimod. None of the patients discontinued ozanimod because of HZ and none of the HZ cases were associated with grade, 4 lymphopenia (defined as an absolute lymphocyte count <0.2 x, 109/L). Conclusion In the ozanimod phase, 3 UC and MS trials, 5%–10% of patients screened did not have demonstrated VZV immunity;, 22%–32% of these patients received varicella vaccination, were rescreened and enrolled. The overall HZ incidence in clinical trials was low (≤1% of patients), all cases were distributed across a single dermatome, and no serious or complicated cases occurred in ozanimod-treated patients with VZV immunity. Additional studies are warranted to evaluate the incidence of HZ in clinical practice.

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Thèses sur le sujet "HZ. None of these, but in this section"

Ebenezer, Catherine. « “Access denied” ? Barriers for staff accessing, using and sharing published information online within the National Health Service (NHS) in England : technology, risk, culture, policy and practice ». Thesis, University of Sheffield, 2017. http://eprints.rclis.org/32585/1/CME%20thesis%20v4.0%20White%20Rose%20final%20single%20volume.pdf.

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The overall aim of the study was to investigate barriers to online professional information seeking, use and sharing occurring within the NHS in England, their possible effects (upon education, working practices, working lives and clinical and organisational effectiveness), and possible explanatory or causative factors. The investigation adopted a qualitative case study approach, using semi-structured interviews and documentary analysis as its methods, with three NHS Trusts of different types (acute - district general hospital, mental health / community, acute – teaching) as the nested sites of data collection. It aimed to be both exploratory and explanatory. A stratified sample of participants, including representatives of professions whose perspectives were deemed to be relevant, and clinicians with educational or staff development responsibilities, was recruited for each Trust. Three non-Trust specialists (the product manager of a secure web gateway vendor, an academic e-learning specialist, and the senior manager at NICE responsible for the NHS Evidence electronic content and web platform) were also interviewed. Policy documents, statistics, strategies, reports and quality accounts for the Trusts were obtained via public websites, from participants or via Freedom of Information requests. Thematic analysis following the approach of Braun and Clarke (2006) was adopted as the analytic method for both interviews and documents. The key themes of the results that emerged are presented: barriers to accessing and using information, education and training, professional cultures and norms, information governance and security, and communications policy. The findings are discussed under three main headings: power, culture, trust and risk in information security; use and regulation of Web 2.0 and social media, and the system of professions. It became evident that the roots of problems with access to and use of such information lay deep within the culture and organisational characteristics of the NHS and its use of IT. A possible model is presented to explain the interaction of the various technical and organisational factors that were identified as relevant. A number of policy recommendations are put forward to improve access to published information at Trust level, as well as recommendations for further research.

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Boyer, Sebastien. « Dans le cadre du nouveau cycle de combustible $^(232)$Th/$^(233)$U, determination de la section efficace de capture radiative $^(233)$Pa(n,$\gamma$) pour des energies de neutrons comprises entre 0 et 1 MeV ». Phd thesis, Université Sciences et Technologies - Bordeaux I, 2004. http://tel.archives-ouvertes.fr/tel-00009062.

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Dans l'optique d'un developpement durable du nucleaire, un des themes de recherche du CNRS dicte par la loi Bataille de 1991, est l'etude d'une nouvelle filiere nucleaire utilisant un combustible a base de minerai de thorium ($^(232)$Th) ou le noyau fissile est l'$^(233)$U. Le principal interet de ce type de combustible reside dans sa particularite de produire les dechets transuraniens en beaucoup plus faible quantite que les reacteurs a eau pressurisee actuels. Cependant certaines donnees nucleaires importantes concernant cette nouvelle filiere sont tres mal connues comme par exemple celles relatives au noyau charniere protactinium 233 ($^(233)$Pa). Sa periode de 27 jours lui confere un role particulier dans le cycle mais en raison de sa trop forte activite l'etude de ce noyau releve du defi experimental. Pour contourner cette difficulte, la probabilite d'emission de rayonnements gamma dans la reaction induite par neutrons $^(233)$Pa(n,$\gamma$) entre 0 et 1 MeV d'energie neutron a ete determinee a partir de la reaction transfert $^(232)Th(^(3)He,p)^(234)Pa*$. Le dispositif de mesure permettait d'identifier la particule de sortie signant ainsi la voie de reaction tandis que des scintillateurs de type C$_(6)$D$_(6)$ permettaient la detection en coincidence des rayonnements gamma emis. La methode d'analyse des evenements gamma a necessite la ponderation des spectres de photons par des fonctions mathematiques calculees dites "fonctions de poids". leurs determinations requierent neanmoins une connaissance parfaite du comportement des scintillateurs (efficacite, fonctions de reponse) dans la geometrie choisie. Pour ce faire, une etude preliminaire a ete realisee a l'aide de sources gamma et avec des reactions induites par protons sur des noyaux legers. Les simulations utilisant le code de transport MCNP ont ete validees par des resultats experimentaux.

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Park, Allison M. « Comparing the Cognitive Demand of Traditional and Reform Algebra 1 Textbooks ». Scholarship @ Claremont, 2011. http://scholarship.claremont.edu/hmc_theses/9.

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Research has shown that students achieved higher standardized test scores in mathematics and gained more positive attitudes towards mathematics after learning from reform curricula. Because these studies involve actual students and teachers, there are classroom variables that are involved in these findings (Silver and Stein, 1996; Stein et al., 1996). To understand how much these curricula by themselves contribute to higher test scores, I have studied the cognitive demand of tasks in two traditional and two reform curricula. This work required the creation of a scale to categorize tasks based on their level of cognitive demand. This scale relates to those by Stein, Schoenfeld, and Bloom. Based on this task analysis, I have found that more tasks in the reform curricula require higher cognitive demand than tasks in the traditional curricula. These findings confirm other results that posing tasks with higher cognitive demand to students can lead to higher student achievement.

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Zurita, Sánchez Juan Manuel. « El paradigma otletiano como base de un modelo para la organización y difusión del conocimiento científico ». Thesis, Universidad Nacional Autónoma de México, 2001. http://eprints.rclis.org/6752/1/tesina._juan_manuel_zurita.pdf.

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Cho, Karina Elle. « Enhancing the Quandle Coloring Invariant for Knots and Links ». Scholarship @ Claremont, 2019. https://scholarship.claremont.edu/hmc_theses/228.

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Quandles, which are algebraic structures related to knots, can be used to color knot diagrams, and the number of these colorings is called the quandle coloring invariant. We strengthen the quandle coloring invariant by considering a graph structure on the space of quandle colorings of a knot, and we call our graph the quandle coloring quiver. This structure is a categorification of the quandle coloring invariant. Then, we strengthen the quiver by decorating it with Boltzmann weights. Explicit examples of links that show that our enhancements are proper are provided, as well as background information in quandle theory.

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Mebane, Palmer. « Uniquely Solvable Puzzles and Fast Matrix Multiplication ». Scholarship @ Claremont, 2012. https://scholarship.claremont.edu/hmc_theses/37.

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In 2003 Cohn and Umans introduced a new group-theoretic framework for doing fast matrix multiplications, with several conjectures that would imply the matrix multiplication exponent $\omega$ is 2. Their methods have been used to match one of the fastest known algorithms by Coppersmith and Winograd, which runs in $O(n^{2.376})$ time and implies that $\omega \leq 2.376$. This thesis discusses the framework that Cohn and Umans came up with and presents some new results in constructing combinatorial objects called uniquely solvable puzzles that were introduced in a 2005 follow-up paper, and which play a crucial role in one of the $\omega = 2$ conjectures.

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Lubisco, Nídia Maria Lienert. « La evaluación en la biblioteca universitaria brasileña : evolución y propuesta de mejora ». Thesis, Universidad Carlos III De Madrid, 2007. http://eprints.rclis.org/12225/1/tesisnidia.pdf.

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This thesis examines the evolution of the evaluation of the university library in Brazil. At present, the only applicable system takes place in the evaluation of academic by the Ministry of Education, through the National Institute for Studies and Research Educacionais Anísio Teixeira (INEP), the entity responsible for coordinating and implementing the process of evaluating the entire education system in Brazil. The starting point for addressing this investigation were the results of a case study developed at the Federal University of Bahia in 2001, under the assumption that the Ministry did not have criteria and appropriate instruments to reflect the library's role as a resource for educational qualifications. The review of the literature relevant Brazilian, British and Spanish regarding the subject, especially regarding experience with the Spanish University Libraries Network (REBIUN), were essential to know the trends and the state of affairs. It also took out a field work through questionnaires in 7 countries and 31 Latin American universities, in order to ascertain the current status of evaluation systems used in that region. The low response rate, about 50% of institutions surveyed, this was offset by the work of the Symposium on Electronic Library evaluator and Quality (Sociedad Argentina de report, 2002), an event of great significance to who came over 450 librarians and teachers. This initiative helped develop a comparative study that served to place the Brazilian reality and take into account the most similar case mix. All this enabled comply with the overall objective of this thesis: develop a model to evaluate university libraries in Brazil, from the state of affairs of the university library and Brazilian experiences located in Latin American countries. That model se basa en el Instrument INEP (2006), but its content is raised, taking into account different jobs: performance indicators for assessing the university library, REBIUN (2000), one of the documents PNBU, prepared Romcy by Maria Carmen de Carvalho (1995), Standards for university libraries in Chile (2001) and methodological guide for evaluating the libraries of institutions of higher education (Mexico, 2000). The final claim is that the Brazilian Ministry has a more comprehensive evaluation system, to be implemented and improved according to the data you make and, in turn, could be to build a bank of information management and a system of indicators performance.

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Moreira, Walter. « A construção de informações documentárias : aportes da linguística documentária, da terminologia e das ontologias ». Thesis, Universidade de São Paulo, 2010. http://eprints.rclis.org/17437/1/TeseFinalRevisada_05Jul2010.pdf.

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Investigates theoretical and practical interfaces between terminology, philosophical ontology, computational ontology and documentary linguistics and the subsidies that they offer for the construction of documentary information. It was established as specific objectives, the analysis of the production, development, implementation and use of ontologies based on the information science theories, the research on the contribution of ontologies for the development of thesauri and vice versa and the discussion of the philosophical foundation of the application of ontologies based on the study of ontological categories present in classical philosophy and in the contemporary proposals. It argues that the understanding of ontologies through the communicative theory of terminology contributes to the organization of a less quantitative access (syntactic) and more qualitative (semantic) of information. Notes that, in spite of sharing some common goals, there is little dialogue between the information science (and, inside it, the documentary linguistics) and computer science. It argues that the computational and philosophical ontologies are not completely independent events, which have among themselves only the similarity of name, and notes that the discussion of categories and categorization in computer science, does not always have the emphasis it receives in information science in studies on knowledge representation. The approach of Deleuze and Guattari's rhizome, was treated as instigator of reflections on the validity of the hierarchical tree model structure and the possibilities of its expansion. It concludes that the construction of ontologies can not ignore the terminological and conceptual analysis, as it's understood by the terminology and by the information science accumulated in the theoretical and methodological basis for the construction of indexing languages and, on the other hand, the construction of flexible indexing languages can not ignore the representational model of ontologies which are more capable for formalization and interoperability.

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Ollendorff, Christine. « Construction d'un diagnostic complexe d'une bibliothèque académique ». Thesis, Ecole nationale supérieure d'arts et métiers - ENSAM, 1999. http://eprints.rclis.org/11682/1/These-co.pdf.

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In the first part, we studies academic libraries whose founding principles are change with the information society. The library manager looks for the best ways to lead a library. Evaluation and management tools on libraries are sources of insatisfactions because of the lack of a holistic vision of libraries they give. Constructivist approaches of management seems an alternative way to help library managers in designing a strategic vision of these organizations. In the second part, we build a modelization project with complex systems modelization of Jean-Louis Le Moigne and soft systems methodology of Peter Checkland. French academic libraries constitute our research field in which we use participant observations and staff and managers interviews. Our system is made up of the academic library in the vision of it leader. We build a three phase diagnostic. With the first phase, the manager can observ services supply as a three axes system which evolves with technologies, materials and humans means and bibliotheconomic knowledge. The second phase studies the informational system with environmental and flow observations. The third phase studies the decisional system, looking for its organization, ist internal information circulation and its decisional processes. This diagnostic is in continuous construction. It works in the library management continuity and is not the first step of a strategic planning. We use the diagnostic in five libraries. Results show modelization supply with the creation of evolving, transposable and learning models.

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Pfeffer, Jörgen. « Online-Tutorials an deutschen Universitäts- und Hochschulbibliotheken : Verbreitung, Typologie und Analyse am Beispiel von LOTSE, DISCUS und BibTutor ». Thesis, 2006. http://eprints.rclis.org/8649/1/Masterarbeit_JoergenPfeffer.pdf.

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This thesis deals with a specific way of teaching information literacy: The library online-tutorial. After giving an introduction into information literacy or rather the teaching of information literacy, the author tries to design a typology of the online tutorial considering the context of e-learning. Furthermore, the work provides a survey of the current situation at German academic libraries concerning the use of tutorials. A crucial part of the thesis comprises the analysis and evaluation of three selected tutorials, which emerge as especially exemplary and forward-looking. Beforehand, a catalogue of criteria for the analysis and evaluation of the tutorials has been depicted. The master’s thesis shows that online-tutorials can be an efficient and effective way of teaching information literacy. This does not imply that the reference or teaching librarian will be completely replaced. At the same time, it becomes evident that in spite of some outstanding tutorial projects, the German academic libraries look after online-tutorials rather reluctantly. Lack of cooperation and fear of high expenses have to be seen as the main obstacles for the widespread use of tutorials.

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Livres sur le sujet "HZ. None of these, but in this section"

Mathematics of probability. Providence, Rhode Island : American Mathematical Society, 2013.

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1949-, Libgober A. (Anatoly), Cogolludo-Agustín José Ignacio et Hironaka Eriko 1962-, dir. Topology of algebraic varieties and singularities : Conference in honor of Anatoly Libgober's 60th birthday, June 22-26, 2009, Jaca, Huesca, Spain. Providence, R.I : American Mathematical Society, 2011.

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Center for Mathematics at Notre Dame et American Mathematical Society, dir. Toplogy and field theories : Center for Mathematics at Notre Dame, Center for Mathematics at Notre Dame : summer school and conference, Topology and field theories, May 29-June 8, 2012, University of Notre Dame, Notre Dame, Indiana. Providence, Rhode Island : American Mathematical Society, 2014.

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Ahmed, S. E. (Syed Ejaz), 1957- editor of compilation, dir. Perspectives on big data analysis : Methodologies and applications : International Workshop on Perspectives on High-Dimensional Data Anlaysis II, May 30-June 1, 2012, Centre de Recherches Mathématiques, University de Montréal, Montréal, Québec, Canada. Providence, Rhode Island : American Mathematical Society, 2014.

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Riemann surfaces by way of complex analytic geometry. Providence, R.I : American Mathematical Society, 2011.

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Conference Board of the Mathematical Sciences et National Science Foundation (U.S.), dir. Lectures on the energy critical nonlinear wave equation. Providence, Rhode Island : Published for the Conference Board of the Mathematical Sciences by the American Mathematical Society, with support from the National Science Foundation, 2015.

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The ultimate challenge : The 3x+1 problem. Providence, R.I : American Mathematical Society, 2010.

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From riches to raags : 3-manifolds, right-angled artin groups, and cubical geometry. Providence, Rhode Island : Published for the Conference Board of the Mathematical Sciences by the American Mathematical Society, Providence, Rhode Island with support from the National Science Foundation, 2012.

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Morse, Robert Fitzgerald, editor of compilation, Nikolova-Popova, Daniela, 1952- editor of compilation et Witherspoon, Sarah J., 1966- editor of compilation, dir. Group theory, combinatorics and computing : International Conference in honor of Daniela Nikolova-Popova's 60th birthday on Group Theory, Combinatorics and Computing, October 3-8, 2012, Florida Atlantic University, Boca Raton, Florida. Providence, Rhode Island : American Mathematical Society, 2013.

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Flannery, D. L. (Dane Laurence), 1965-, dir. Algebraic design theory. Providence, R.I : American Mathematical Society, 2011.

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Chapitres de livres sur le sujet "HZ. None of these, but in this section"

Fraile-Ardanuy, Jesus, Dionisio Ramirez, Sergio Martinez, Jairo Gonzalez et Roberto Alvaro. « The Evolution from Electric Grid to Smart Grid ». Dans Data Science and Simulation in Transportation Research, 259–81. IGI Global, 2014. http://dx.doi.org/10.4018/978-1-4666-4920-0.ch013.

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In this chapter, an overview of electric power systems is presented. The purpose is to describe the structure and operation of the power system and its evolution to the new smart grids. The first section gives an introduction about the electric grid and its evolution. Then, there is a section with a brief description of the different components of the electric power system: generation, transmission, distribution, and consumption. The third section is related to power system control, explaining why control actions are necessary in the power system to maintain the balance between supply and consumption and to keep constant the system frequency (at 50 or 60 Hz). In order to understand future applications of electric vehicles, it is important to present a fourth section related to fundamentals of the electricity markets. The chapter finishes with a description of the future power systems with high penetration of intermittent renewable energies, energy storage capacity, active demand management, and integration with telecommunication infrastructure.

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Smithies, Declan. « Luminosity ». Dans The Epistemic Role of Consciousness, 345–79. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780199917662.003.0011.

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Chapter 11 defends the thesis that some phenomenal and epistemic conditions are luminous in the sense that you’re always in a position to know whether or not they obtain. Section 11.1 draws a distinction between epistemic and doxastic senses of luminosity and argues that some conditions are epistemically luminous even if none are doxastically luminous. Section 11.2 uses this distinction in solving Ernest Sosa’s version of the problem of the speckled hen. The same distinction is applied to Timothy Williamson’s anti-luminosity argument in section 11.3, his argument against epistemic iteration principles in section 11.4, and his argument for improbable knowing in section 11.5. Section 11.6 concludes by explaining why this defense of luminosity is not merely a pointless compromise.

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« Literary Selections ». Dans Roots of the Black Chicago Renaissance, sous la direction de Richard A. Courage et Christopher Robert Reed, 245. University of Illinois Press, 2020. http://dx.doi.org/10.5622/illinois/9780252043055.003.0013.

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Editors’ Note: Our study concludes with a section comprising three literary selections that we intend to break new ground for a scholarly collection. None of the selections is a conventional academic essay, each belongs to a different genre of writing, and each amplifies the light already shone on the roots of the Black Chicago Renaissance....

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Phillips, David. « The Critique of Common-Sense Morality (Methods III.I–III.XI) ». Dans Sidgwick's The Methods of Ethics, 96–119. Oxford University Press, 2022. http://dx.doi.org/10.1093/oso/9780197539613.003.0006.

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This chapter focuses on The Methods of Ethics, Book III, Chapters I through XI. Its topic is Sidgwick’s critique of the theory he calls “common-sense morality” or “dogmatic intuitionism.” The first section introduces this theory, noting problems with both Sidgwick’s names for it. The second section discusses the project of Chapters I through XI, making the principles of common-sense morality clear and precise. The third section introduces the four conditions Sidgwick uses to test putative axioms. The fourth section outlines his argument that none of the principles of common-sense morality satisfy the four conditions, focusing on the example of promissory obligation. The fifth section considers two responses: defending absolutist deontology, and moving to moderate deontology by introducing, as W. D. Ross does, the concept of prima facie duty. The final section raises questions about the fairness of Sidgwick’s critique.

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Collins, Richard B., Dale A. Oesterle et Lawrence Friedman. « Schedule ». Dans The Colorado State Constitution, 457–62. Oxford University Press, 2020. http://dx.doi.org/10.1093/oso/9780190907723.003.0030.

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This chapter discusses the “Schedule” of the Colorado Constitution. Transition to statehood required that territorial institutions and law be retained until expressly replaced. At the end of the original constitution, twenty-two sections under the heading of Schedule detailed how the transition should work. Although almost entirely obsolete, none has been repealed. Schedule Section 1 was invoked by enterprising defense lawyers in efforts to get their clients off on a technicality. At least one succeeded. Section 20, requiring that presidential electors “be chosen by direct vote of the people,” could be read as obsolete or as a continuing constitutional rule. It is the only section with possible relevance to a current dispute.

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Knee, Jonathan A. « Lessons from Clown School ». Dans Class Clowns, 202–32. Columbia University Press, 2016. http://dx.doi.org/10.7312/columbia/9780231179287.003.0007.

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The final section of Class Clowns tries to draw some conclusions from the analyses and case studies. Ten lessons are drawn that should provide guardrails to anyone seeking to play in the education domain. Broadly, the failures highlighted fall into three broad buckets: misguided ambition, misunderstood markets and faulty execution. None of these phenomena are unique to education, but their application takes on a very particular shape in the educational context.

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Anne Franks, Mary. « “Not Where Bodies Live” ». Dans Free Speech in the Digital Age, 137–49. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190883591.003.0009.

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John Perry Barlow, one of the founders of the Electronic Frontier Foundation (EFF), famously claimed in 1996 that the internet “is a world that is both everywhere and nowhere, but it is not where bodies live.” The conception of cyberspace as a realm of pure expression has encouraged an aggressively anti-regulatory approach to the internet. This approach was essentially codified in U.S. federal law in Section 230 of the Communications Decency Act, which invokes free speech principles to provide broad immunity for online intermediaries against liability for the actions of those who use their services. The free speech frame has encouraged an abstract approach to online conduct that downplays its material conditions and impact. Online intermediaries use Section 230 as both a shield and a sword—simultaneously avoiding liability for the speech of others while benefiting from that speech. In the name of free expression, Section 230 allows powerful internet corporations to profit from harmful online conduct while absorbing none of its costs.

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Schram, Frederick R., et Stefan Koenemann. « Mictacea ». Dans Evolution and Phylogeny of Pancrustacea, 362–69. Oxford University Press, 2021. http://dx.doi.org/10.1093/oso/9780195365764.003.0028.

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Mictacea demonstrates the confusion that occurs when animals share so many primitive features. Modest Guţu in fact erected a number of orders to accommodate them, but these do not seem entirely justified. Although the two orders erected by Guţu currently do not have much support, in fairness it must be recognized that molecules, or information from yet-to-be-recognized mictacean taxa, could change the situation. In this case, Guţu’s Bochusacea and Cosinzeneacea might yet prove useful. They inhabit anchialine caves and the deep sea. The animals are small, slender, and subcylindrical in outline. The diagnosis of Guţu to the contrary, none of these animals appear particularly “flattened” in cross-section.

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Sarch, Alexander. « The Scope of the Willful Ignorance Doctrine (I) ». Dans Criminally Ignorant, 85–108. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190056575.003.0004.

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Determining when the equal culpability thesis holds sets the boundaries in which the willful ignorance doctrine is to be applied. Chapter 3 thus considers the best existing attempts to specify the conditions in which the equal culpability thesis holds, but proceeds to argue that none succeeds. Still, each failure is instructive. First, the chapter argues against the unrestricted equal culpability thesis. Not all willful ignorance, it turns out, is as culpable as the analogous knowing misconduct. Then the chapter argues against the three leading attempts to restrict the thesis. Section II argues against a restriction that appeals to bad motives, while Section III argues against a common counterfactual restriction (according to which willful ignorance is as culpable as knowing misconduct when one would do the actus reus even with knowledge). The latter proposal fails since criminal culpability does not depend on considerations about counterfactual conduct or one’s willingness to misbehave. Finally, Section IV discusses a third restriction, offered by Deborah Hellman, which asks whether the decision to remain in ignorance was itself justified. This version of the thesis is on the right track, but still requires refinement in important ways.

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Fabre, Cécile. « Building Blocks ». Dans Spying Through a Glass Darkly, 12–36. Oxford University Press, 2022. http://dx.doi.org/10.1093/oso/9780198833765.003.0002.

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This chapter sets the stage for the remainder of the book. It provides an overview of the ethics of spying in classical moral and political thought. It examines three possible approaches to espionage: (a) the dirty-hands approach, which sees espionage as a necessary evil; (b) the contractarian view that espionage is best defended by appeal to normative conventions endorsed by all; (c) the view that the most fruitful way to construct an ethics of espionage is through the lens of just-war theory. None of those approaches are fully satisfactory, though they provide building blocks for the approach taken in this book. The final section sets out the normative principles on which the book rests.

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Actes de conférences sur le sujet "HZ. None of these, but in this section"

Studer, J. Daine, Jesus E. Chacin, Roger Walters et Hoai Ann Nguyen. « Intentionally Deadheading SAGD ESPs - An Unconventional Approach to Improve Run Life ». Dans SPE Gulf Coast Section Electric Submersible Pumps Symposium. SPE, 2021. http://dx.doi.org/10.2118/204521-ms.

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Abstract SAGD ESPs run at the highest motor temperatures current technology allows. However, they cool very rapidly when shutdown. High cooling rates promote motor oil volumetric contraction, eventually leading to wellbore fluid ingress and short-circuited motors. The Paper presents successful field tests designed to decrease ESP cooling rates by inducing controlled deadheads, rather than shutting down ESPs. Various extended deadhead field trials (up to 70+ days duration) validated the approach, while confirming that no deadhead related ESP damage was induced. ESP temperature changes were measured using fiber optics strings installed as part of the usual completion in 60+ wells, during a four week-long field-wide plant maintenance turn-around. While cooling rates varied somewhat from well to well, they all showed very similar behavior and were very well fitted with a log-normal distribution, R2factor > 95%. Most ESP temperatures decreased between 50°C to 120°C in a week. This data was used as a general baseline to support the deadheading field trials. An ESP was fitted internally with an RTD at the base of the motor and externally with a clamped fiber optics string. This ESP was operated normally at 55 Hz for a few months. An 8-hour shut down test established an initial base line cooling rate of 6.6°C/hour. Subsequent 6-hour deadhead tests at 30Hz and 45 Hz showed decreased cooling rates of 4.0°C/hour and 2.2°C/hour, respectively. This result clearly established the potential to deadhead at different frequencies to obtain different lower cooling rates. Finally, two extended deadhead tests (3 and 10 weeks in duration) were executed to help determine if it was possible to induce damage in SAGD ESPs by deadheading, as is usually the case in most non-thermal applications. These ESPs operated normally after the extended tests and one was dismantled upon failure, looking for any signs of deadhead damage. Results presented show that deadheading SAGD ESPs provides the opportunity to safely minimize ESP thermal cycles, which could lead to a significant improvement in ESP run life.

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Karmakar, S., et A. Kushari. « Recirculating Flow and Turbulence in a Low Aspect Ratio Dump Combustor ». Dans ASME 2005 Fluids Engineering Division Summer Meeting. ASMEDC, 2005. http://dx.doi.org/10.1115/fedsm2005-77112.

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Re-circulating flows are established in dump combustors at the dump plane due to the sudden expansion. However, given enough length, the separated flow at the dump plane attaches itself inside the combustor and a fully developed, non-circulating, attached flow field is established. But, if the length of the combustor is less than the free-stream reattachment length, then the flow does not re-attach inside the combustor. Instead, a portion of the flow is reflected from the exit section, causing stronger re-circulation that modifies the flow structure inside the combustor. This paper describes an experimental study of turbulent flow field inside a dump combustor for a range of flow Reynolds numbers. The focus of this effort is to study the interaction between the flow re-circulation and the large-scale turbulence. Detailed measurements of the wall pressure transients were taken using strain-gage pressure sensors. The fluctuating component of the pressure was isolated and analyzed. The signals were analyzed using FFT, Auto-Correlation and Cross-correlation to distinguish the re-circulating flow and the large-scale turbulence. The re-circulating flow, identified by low frequency fluctuations in pressure (∼ 0.5 Hz), was seen to be strongest inside the combustor almost half way through the combustor length. At the same time, the large-scale turbulence intensity (identified by high frequency fluctuations in the range of 460 Hz) level is seen to be lower inside the combustor than in the incoming pipe. This can be attributed to the turbulence cascading due to the re-circulating flow, which increases the small-scale energy and reduces the large-scale energy. These results show turbulence modulation due to re-circulating flow and can have far reaching applications in swirling turbulent flows.

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Damianus, Fritz, Gordon Poole, Oleg Khakimov, Guillaume Cambois, Mohamed Mahgoub et Alessandro Tansini. « Combined Use of Nearfield Hydrophones and Multiple Migration for Shallow Imaging ». Dans International Petroleum Technology Conference. IPTC, 2022. http://dx.doi.org/10.2523/iptc-21933-ea.

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Abstract Modern acquisition approaches are moving towards ocean bottom node (OBN) designs. By acquiring hydrophone and geophone data, wavefield separation of these data provides access to up-going and down-going wavefields, and powerful techniques such as up/down deconvolution can be employed to attenuate surface related multiples and the source wavelet. In shallow water regions, however, very shallow reflections are not recorded. This paper will illustrate how we can derive an image of the shallow subsurface jointly using near field hydrophone (NFH) data and multiple imaging. Traditionally used for source firing QC, NFH data are gaining popularity for shallow imaging. Typically recorded with a sample interval of 1 ms or less, NFH recordings are higher frequency than OBN data, which are normally limited to 250 Hz. In very shallow water regions, NFHs mounted on the inactive source array may only record beyond-critical arrivals which have limited use for shallow imaging. In this paper, we will demonstrate the use of NFH recordings mounted on the firing array to overcome this problem. However, NFH data on the firing array often suffer difficulties when recovering low frequency reflections due to the extremely strong direct arrival. In addition, processes such as source deghosting and demultiple may be challenging due to the single-fold nature of the data. Another method that is gaining popularity for shallow imaging is multiple migration. Compared to imaging with primaries, multiple imaging provides a larger illumination area with smaller incident angles. We propose to combine the low frequencies from multiple imaging with the high frequencies from NFH imaging to provide a high-resolution image of the shallow section. To illustrate this, we use a shallow water OBN dataset acquired offshore Abu Dhabi in water depths of 3 m to 50 m, where complementary information provided by NFH imaging and multiple migration, and the combination of these images, has resulted in a broadband shallow subsurface section with improved spatial continuity and reduced sidelobes.

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Matsuda, Kazutoshi, Kusuo Kato, Kouki Arise et Hajime Ishii. « Study on the Relation Between Side Ratios of Rectangular Cross Sections and Secondary Vortices at Trailing Edge in Motion-Induced Vortex Excitation ». Dans ASME 2017 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/pvp2017-65565.

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According to the results of conventional wind tunnel tests on rectangular cross sections with side ratios of B/D = 2–8 (B: along-wind length (m), D: cross-wind length (m)), motion-induced vortex excitation was confirmed. The generation of motion-induced vortex excitation is considered to be caused by the unification of separated vortices from the leading edge and secondary vortices at the trailing edge [1]. Spring-supported test for B/D = 1.18 was conducted in a closed circuit wind tunnel (cross section: 1.8 m high×0.9 m wide) at Kyushu Institute of Technology. Vibrations were confirmed in the neighborhoods of reduced wind speeds Vr = V/fD = 2 and Vr = 8 (V: wind speed (m/s), f: natural frequency (Hz)). Because the reduced wind speed in motion-induced vortex excitation is calculated as Vr = 1.67×B/D = 1.67×1.18 = 2.0 [1], vibrations around Vr = 2 were considered to be motion-induced vortex excitation. According to the smoke flow visualization result for B/D = 1.18 which was carried out by the authors, no secondary vortices at the trailing edge were formed, although separated vortices from the leading edge were formed at the time of oscillation at the onset wind speed of motion-induced vortex excitation, where aerodynamic vibrations considered to be motion-induced vortex excitation were confirmed. It was suggested that motion-induced vortex excitation might possibly occur in the range of low wind speeds, even in the case of side ratios where secondary vortices at trailing edge were not confirmed. In this study, smoke flow visualizations were performed for ratios of B/D = 0.5–2.0 in order to find out the relation between side ratios of rectangular cross sections and secondary vortices at trailing edge in motion-induced vortex excitation. The smoke flow visualizations around the model during oscillating condition were conducted in a small-sized wind tunnel at Kyushu Institute of Technology. Experimental Reynolds number was Re = VD/v = 1.6×103. For the forced-oscillating amplitude η, the non-dimensional double amplitudes were set as 2η/D = 0.02–0.15. Spring-supported tests were also carried out in order to obtain the response characteristics of the models.

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Sugano, M., U. Somboon, H. Kisuki, T. Satake, Z. Tanaka et A. Ohmori. « Corrosion Fatigue Properties of Al2O3 Plasma-Sprayed SUS316L Stainless Steel in a Physiological Saline Solution ». Dans ITSC2001, sous la direction de Christopher C. Berndt, Khiam A. Khor et Erich F. Lugscheider. ASM International, 2001. http://dx.doi.org/10.31399/asm.cp.itsc2001p1171.

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Abstract The SUS316L stainless steel rod specimen coated with plasma-sprayed Al2O3 deposits has been fatigued in a physiological saline solution (0.9 % NaCl solution) to evaluate the potential of its application to prosthetic implant materials. Push-pull loading fatigue tests were conducted at the stress ratio of R = -1, and at the frequency of 2 Hz. Pure titanium powder was selected for undercoat. Fatigue damage was examined on longitudinal section of the specimen and fracture surface by optical and electron microscopy from the microstructural viewpoints. The plasma spraying of Al2O3 powder has significantly improved fatigue properties of the substrate metal in the longer range of fatigue lives, compared with the results of the non-coated steel specimen. It was found from electrochemical experiments that titanium for undercoat metal has acted as sacrificial anode to protect the substrate metal from corrosive attack and under lower stress amplitudes the plasma sprayed Al2O3 coating kept the solution out at an early stage of fatigue lives. Fatigue cracks preferentially originated from flaws, which had been caused on the substrate metal surface through grit blasting, and extended into the bulk of substrate metal. Fatigue cracks appear not to develop into plasma-sprayed deposits while the deposits could accommodate themselves to the crack opening displacement at the surface of substrate metal. It was understood that the plasma sprayed coating has enhanced fatigue properties in the solution both by keeping the solution out during the early stage of fatigue lives and by electrochemical effects of the undercoat metal when the topcoat was cracked in macroscopic scale.

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Wei, Sheng, Brandon Sforzo et Jerry Seitzman. « High Speed Imaging of Forced Ignition Kernels in Non-Uniform Jet Fuel/Air Mixtures ». Dans ASME Turbo Expo 2017 : Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/gt2017-63300.

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This paper describes experimental measurements of forced ignition of prevaporized liquid fuels in a well-controlled facility that incorporates non-uniform flow conditions similar to those of gas turbine engine combustors. The goal here is to elucidate the processes by which the initially unfueled kernel evolves into a self-sustained flame. Three fuels are examined: a conventional Jet-A and two synthesized fuels that are used to explore fuel composition effects. A commercial, high-energy recessed cavity discharge igniter located at the test section wall ejects kernels at 15 Hz into a preheated, striated crossflow. Next to the igniter wall is an unfueled air flow; above this is a premixed, prevaporized, fuel-air flow, with a matched velocity and an equivalence ratio near 0.75. The fuels are prevaporized in order to isolate chemical effects. Differences in early ignition kernel development are explored using three, synchronized, high-speed imaging diagnostics: schlieren, emission/chemiluminescence, and OH planar laser-induced fluorescence (PLIF). The schlieren images reveal rapid entrainment of crossflow fluid into the kernel. The PLIF and emission images suggest chemical reactions between the hot kernel and the entrained fuel-air mixture start within tens of microseconds after the kernel begins entraining fuel, with some heat release possibly occurring. Initially, dilution cooling of the kernel appears to outweigh whatever heat release occurs; so whether the kernel leads to successful ignition or not, the reaction rate and the spatial extent of the reacting region decrease significantly with time. During a successful ignition event, small regions of the reacting kernel survive this dilution and are able to transition into a self-sustained flame after ∼1–2 ms. The low aromatic/low cetane number fuel, which also has the lowest ignition probability, takes much longer for the reaction zone to grow after the initial decay. The high aromatic, more easily ignited fuel, shows the largest reaction region at early times.

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Al-Shuwaikhat, Hisham I., Shaker A. Al-Buhassan, Turki F. Al-Saadoun et Saad M. Al-Driweesh. « Optimizing Production Facilities Using None-Radio Active Source MPFM in Ghawar Field in Saudi Aramco ». Dans SPE Saudi Arabia section Young Professionals Technical Symposium. Society of Petroleum Engineers, 2008. http://dx.doi.org/10.2118/117063-ms.

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Salajegheh, Sadid, et Mehran Tadjfar. « Unsteady Flow Over a Dragonfly Wing-Section Model ». Dans ASME 2009 Fluids Engineering Division Summer Meeting. ASMEDC, 2009. http://dx.doi.org/10.1115/fedsm2009-78354.

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Here we study the flapping of a dragonfly’s wing section where the frequency of the wing flapping is about 25–30 HZ. We have translational and rotational velocities in a single stroke. In this article we investigate dragonfly’s 2D sections and we want to study the effect of the corrugations during unsteady flight at low Reynolds number. We find that in contrast to the published results for steady flow over the wings, where the corrugation seems to have improved the performance over a profiled wing-section, here a simple flat plate seems to perform better than the corrugated one. However, the corrugated wing-sections have a better aerodynamic performance than the traditional profiled wing-sections. The flow Reynolds number in this study is 8000.

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Mousavi sani, Seyedmohammad, Navid Goudarzi, Mohammadamin Sheikhshahrokhdehkordi, Tucker Bisel, Jerry Dahlberg et Peter Tkacik. « Exploring and Improving the Flow Characteristics of an Empty Water Channel Test Section : The Application of TomoPIV and Flowrate Sensors for Whole-Flow-Field Visualization ». Dans ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ajkfluids2019-5539.

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Abstract This paper presents the quantitative results of improving the uniformity of the flow field within the test section of a constant cross section, closed-loop water channel. Tomographic Particle Image Velocimetry (TomoPIV) and four flowrate sensors are used to determine the mean velocity and velocity fluctuations at two motor frequencies: 7.5 Hz and 10 Hz (an approximate free stream flow velocity of 0.11 m/s and 0.18 m/s, respectively). The flow field velocity determined by the flowrate sensors showed great agreements with the TomoPIV results. For instance, at the 10 Hz water channel motor frequency, the flowrate sensors and TomoPIV obtained velocity ranges of 0.191–0.202 m/s and 0.185–0.21 m/s, respectively. In order to reduce the flow speed variations within the studied TomoPIV measurement volume, improvements were implemented on the water channel to include an adjustable screen and deflector to the first set of turning vanes downstream from the water channel motor. The modification improved the 7.5 Hz motor frequency measured flow velocity from 0.16–0.172 m/s to 0.106–0.108 m/s resulting in a final variation of flow speed within the measurement volume reduced to 1%.

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Katou, Hajime, et Ryou Miyake. « Development on a Non-Contact Mixing Device for Micro-Liquids ». Dans ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/fedsm2003-45291.

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We have developed a new device that can mix a micro-liquid without contact (i.e., one without a paddle or a screw). Essentially, non-contact mixing does not cause any cross-contamination or carryover, therefore it should be applied to a chemical analyzer, where high accuracy is needed. In the field of chemical analysis, especially for medical diagnostics using blood, decreasing the volume of samples and reagents is very important. Chemical analysis at low sample and reagent volumes will bring several merits: 1) Low sample volume will reduce indisposition in patients. 2) Low sample volume will allow analysis in babies or infants, from whom large samples can’t be collected the supply of. 3) Low reagent volume will reduce the cost of testing. 4) Low reagent volume will reduce exhausting liquids after tests. In our laboratory, we have found that a liquid in a vessel can flow when a proper wave on a free surface is generated. Using this phenomenon, we developed a non-contact mixing device for micro-liquids. To generate a wave on a free surface, we used an ultrasound. The free surface is pushed out when the ultrasound propagating in the liquid reaches the free surface. This effect is due to the radiation pressure caused by an ultrasound. Our developed mixing device consists of only two mechanical components: a vessel and a sound source. The vessel used in our demonstration was rectangular. A cross section of the vessel was 3.8 × 5.6 mm, with a depth of 20 mm and walls 0.6 mm thick. Thus, this vessel can be filled with about 400 μ L of liquid. Actually, because a portion is needed to hold the vessel, we used less than 12 mm of the depth (250 μ L liquid). The frequency of the ultrasound we used was 1.6 MHz, and the sound source for emitting the ultrasound was made of PZT. To obtain its effective power, the PZT thickness resonance was used. Therefore, we made the PZT plate 1.1 mm thick. The sound source was arranged outside the vessel, and it emitted ultrasound toward the free surface in the vessel. Emitted ultrasound permeates through the wall of a vessel and reaches the free surface of a liquid. When it is pulsatile, the ultrasound reaching the free surface generates a wave. In the liquid under the wavy free surface, a circulating flow occurs. The intensity of the flow depends on the amplitude and frequency of the surface. From our theoretical and experimental study, we found that the best pulsating frequency was 20 Hz for our vessel. We measured the velocity of the circulating flow under this condition by using PIV. The results were that a maximum velocity of 300 mm/sec was observed. In the next step, we applied our device to mixing a real sample and reagent. A serum of a horse was used as the sample. In general, there is a difference in refractive index between the sample and reagent. By using the Schlieren visualization method, we observed the mixing process between the sample and reagent, and evaluated the mixing time needed for them to be fully homogeneous. Our results demonstrated that 250 μ L of liquid can be mixed within 1.8 sec.

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Rapports d'organisations sur le sujet "HZ. None of these, but in this section"

Burns, L. E. 7200 Hz coplanar resistivity of the Salcha River-Pogo mining area, central Alaska (resistivity contours and section lines included). Alaska Division of Geological & Geophysical Surveys, février 2000. http://dx.doi.org/10.14509/2751.

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Burns, L. E. 7200 Hz coplanar resistivity of the Salcha River-Pogo mining area, central Alaska (blueline ; resistivity contours and section lines included). Alaska Division of Geological & Geophysical Surveys, février 2000. http://dx.doi.org/10.14509/2752.

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Burns, L. E. 7200 Hz coplanar resistivity of parts of the Aniak and Iditarod mining districts, southwestern Alaska (blueline ; resistivity contours and section lines included). Alaska Division of Geological & Geophysical Surveys, 2000. http://dx.doi.org/10.14509/2716.

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Burns, L. E. 900 Hz coplanar resistivity of parts of the Aniak and Iditarod mining districts, southwestern Alaska (blueline ; resistivity contours and section lines included). Alaska Division of Geological & Geophysical Surveys, 2000. http://dx.doi.org/10.14509/2719.

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Burns, L. E. 7200 Hz coplanar resistivity of parts of the Aniak and Iditarod mining districts, southwestern Alaska (resistivity contours and section lines included ; full color, 600 dpi). Alaska Division of Geological & Geophysical Surveys, 2000. http://dx.doi.org/10.14509/2715.

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Burns, L. E. 900 Hz coplanar resistivity of parts of the Aniak and Iditarod mining districts, southwestern Alaska (resistivity contours and section lines included ; full color, 600 dpi). Alaska Division of Geological & Geophysical Surveys, 2000. http://dx.doi.org/10.14509/2718.

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Burns, L. E. 56,000 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map B - north, Prince of Wales Island (blueline ; resistivity contours and section lines included). Alaska Division of Geological & Geophysical Surveys, 1999. http://dx.doi.org/10.14509/295.

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Burns, L. E. 56,000 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map C - south, Prince of Wales Island (blueline ; resistivity contours and section lines included). Alaska Division of Geological & Geophysical Surveys, 1999. http://dx.doi.org/10.14509/296.

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Burns, L. E. 7200 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map B - north, Prince of Wales Island (blueline ; resistivity contours and section lines included). Alaska Division of Geological & Geophysical Surveys, 1999. http://dx.doi.org/10.14509/299.

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Burns, L. E. 7200 Hz coplanar resistivity of selected areas near Ketchikan, southeastern Alaska, Map C - south, Prince of Wales Island (blueline ; resistivity contours and section lines included). Alaska Division of Geological & Geophysical Surveys, 1999. http://dx.doi.org/10.14509/300.

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