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J. Noirot,I. Zacharie-Aubrun,T. Blay 한국원자력학회 2018 Nuclear Engineering and Technology Vol.50 No.2
Focused ion beamescanning electron microscope and electron backscattered diffraction examinationswere conducted in the center of a 73 GWd/tU UO2 fuel. They showed the formation of subdomains withinthe initial grains. The local crystal orientations in these domains were close to that of the original grain. Most of the fission gas bubbles were located on the boundaries. Their shapes were far from spherical andfar from lenticular. No interlinked bubble network was found. These observations shed light on previousunexplained observations. They plead for a revision of the classical description of fission gas releasemechanisms for the center of high burn-up UO2. Yet, complementary detailed observations are needed tobetter understand the mechanisms involved
Iltis, Xaviere,Drouan, Doris,Blay, Thierry,Zacharie, Isabelle,Sabathier, Catherine,Onofri, Claire,Steyer, Christian,Schwarz, Christian,Baumeister, Bruno,Allenou, Jerome,Stepnik, Bertrand,Petry, Winfri Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.8
Within the frame of the EMPIrE test, four monolithic mini-plates were irradiated in the ATR reactor. In two of them, the monolithic U(Mo) foil had been PVD-coated with Zr before the plate manufacturing. Extensive microstructural characterizations were performed on a fresh archive mini-plate, using Optical Microscopy (OM), Scanning Electron Microscopy (SEM) combined with Energy Dispersive Spectroscopy (EDS), Electron Backscattered Diffraction (EBSD) and Focused Ion Beam (FIB)/Transmission Electron Microscopy (TEM) with nano EDS. A particular attention was paid to the examination of the U(Mo) foil, the PVD coating, the cladding/Zr and Zr/U(Mo) interfaces. The Zr coating has a thickness around 15 ㎛. It has a columnar microstructure and appears dense. The cohesion of the cladding/Zr and Zr/U(Mo) interfaces seems to be satisfactory. An almost continuous layer with a thickness of the order of 100-300 nm is present at the cladding/Zr interface and corresponds to an oxidized part of the Zr coating. At the Zr/U(Mo) interface, a thin discontinuous layer is observed. It could correspond to locally oxidized U(Mo). This work provides a basis for interpreting the results of characterizations on EMPIrE irradiated plates.
Zachary Zeigler(Zachary Zeigler ),Malachi Votaw(Malachi Votaw ),Connor Dreos(Connor Dreos ),Lydia Durnil(Lydia Durnil ),Jamie Terran(Jamie Terran ),Danielle Akin(Danielle Akin ),Trevor Nordin(Trevor N 사피엔시아 2018 Exercise Medicine Vol.2 No.-
Objectives: Acute exercise can result in post-exercise hypotension (PEH) lasting up to 24-h. Whether exercise performed on consecutive days would lead to an accumulating PEH effect has yet to be determined. The purpose of this study was to compare daily exercise (DE) to exercise performed on alternating days (AE) and control (CON) on PEH. Methods: Sedentary men 18-30 yr with elevated blood pressure (BP) participated in this three-arm randomized cross-over trial. The primary comparison was PEH between three groups (CON, AE, DE) over time (day 1,2,3). Both exercise groups were prescribed the same exercise intensity (70-75%HRmax), and total duration of exercise (90min) on a cycle ergometer. DE performed exercise on three consecutive days (three bouts 30min). AE performed exercise on two alternating days (2 bouts 45min). Following exercise subjects remained in the laboratory for 1-h while BP was taken every 5-min. Results: Nine overweight (BMI=29.2±4.5kg/m2), young (22.7±2.4years), moderately fit (VO2peak=35.6±7.3 ml.kg.min), male subjects with elevated BP (126.2±10.4 and 73.3±6.4 mmHg) completed the study. There was a significant systolic BP condition by day effect such that on day three systolic BP (CON 119.0±9.3, AE 118.9±15.0, DE 115.0±11.9 mmHg), and diastolic BP (CON 71.9±6.6, AE 68.4±10.3, DE 67.6±6.2 mmHg) were lowest during the post-exercise DE condition (P<0.001). Additionally, DE saw a significant reduction of resting systolic BP between day 1 and day 4 (122.8±10.2 mmHg vs 113.1±12.0 mmHg; P=0.022, respectively) and a borderline significant reduction between day 1 and day 3 (122.8±10.2 mmHg vs 114.8±10.0 mmHg; P=0.051, respectively). DE saw a borderline significant resting diastolic BP reduction between day 1 and day 3 (73.2±7.2 mmHg vs 68.6±6.5 mmHg; P=0.058, respectively) and a significant reduction between day 1 and day 4 (73.2±7.2 mmHg vs 66.4±4.3 mmHg; P=0.022, respectively). Conclusions: In conclusion, the post-exercise BP lowering effect of the prior exercise session appeared to accumulate during DE such that day 3 was the lowest of all conditions and days.
Heavy Fermion Superconductivity: 5f vs 4f
Zachary Fisk,Yoshinori Haga 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
Heavy electron materials are the only class of materials in which we know where to look forsuperconductivity. We discuss the relation between single ion and dense Kondo heavy electronphysics, what sets the energy scale in these materials, the ways in which their low temperatureexotic superconductivity is a prototype for all highly correlated electron superconductivity and thesimilarities between the 4f and 5f heavy Fermion materials.
Zachary Spiritos,Parit Mekaroonkamol,Bassel F. El-Rayes,Seth D. Force,Steven A. Keilin,Qiang Cai,Field F. Willingham 대한소화기내시경학회 2017 Clinical Endoscopy Vol.50 No.5
Esophageal cancer has a poor overall prognosis and is frequently diagnosed at a late stage. Conventional treatment for metastatic esophageal cancer involves chemotherapy and radiation. Local disease control plays a significant role in improving survival. Endoscopic spray cryotherapy is a novel modality that involves freezing and thawing to produce local ablation of malignant tissue via ischemic mechanisms. Spray cryotherapy has been shown to be effective, particularly for early T-stage, superficial esophageal adenocarcinomas. We present the case of a 72-year-old-male with locally recurrent stage IV esophageal adenocarcinoma and long-term survival of 7 years to date, with concurrent chemoradiation and serial cryoablation. He remains asymptomatic and continues to undergo chemotherapy and sequential cryoablation. The findings highlight the long-term safety and efficacy of cryotherapy in combination with chemoradiation, and suggest that cryoablation may have an additive role in the treatment of advanced stage esophageal adenocarcinoma.
Zachary Stephen Zeigler,Trevor Carroll Nordin 대한비만학회 2019 The Korean journal of obesity Vol.28 No.3
Background: Weight cycling (WC) is a widespread behavior associated with elevated laboratory blood pressure (BP). The impact WC may have on ambulatory BP (ABP) is unknown. Methods: Impact of self-reported WC history on ABP was assessed via cross-sectional nonexperimental design. Sixty-five women completed the Weight and Lifestyle Inventory (WALI) questionnaire. The WALI has been shown to be a reliable index of WC (r=0.87, P<0.001). Data were analyzed looking at WC both as a continuous and criterion variable, and subjects were dichotomized as either WC or non-WC (NWC). Results: WC (n=31) were older (39.7±8.9 vs. 33.1±11.3 years), had a higher percent body fat (47.1%±6.2% vs. 41.4%±7.8%), and were less fit (21.2±5.4 vs. 26.7±7.6 mL/kg/min) than NWC (n=34). No significant correlation between laboratory systolic BP (SBP, P=0.830) or diastolic BP (DBP, P=0.997) and WC was observed. A significant correlation between the number of WC and systolic ABP (r=0.326, P=0.010) and trend for diastolic ABP (r=0.238, P=0.065) was found. SBP (23% vs. 17%, P<0.001) and DBP (13% vs. 9%, P<0.001) load was higher for WC compared to NWC women. Conclusion: WC may deleteriously affect BP outcomes that might only be observed when ABP monitoring is used.
Femoral Vein Reconstruction for Aortic Infections
Zachary S. Pallister,Jayer Chung 대한혈관외과학회 2021 Vascular Specialist International Vol.37 No.1
While rare, abdominal aortic infections remain one of the most technically and emotionally challenging cases that a vascular surgeon may face. Secondary infections of either endovascular, or open aortic reconstructions range from 0.2% to 8%. Primary aortic infections are much more rare. Diagnosis can be elusive, depending upon the virulence of the causative microbes, and extent of the infection. Patients are often brittle, with immunocompromise and malnutrition prevalent in this patient population. The gold standard diagnostic test remains a computed tomographic angiogram. The mainstay of management requires vascular control, and wide debridement of all infected materials and revascularization. Multiple methods exist to reconstruct the vascular supply. The neo-aortoiliac system (NAIS) is attractive as it utilizes the patient’s own femoral veins to reconstruct the vascular supply after the infection has been extirpated. The procedure is demanding upon the patient and surgeons alike. Also, the rarity of aortic infections limit experiences the literature to centers of excellence. However, the NAIS resists infection well, leaving the patient without any remaining foreign bodies. No further costs for conduit are incurred. Moreover, multiple experiences show excellent durability. While comparative effectiveness literature remains sparse, we believe the NAIS to be the optimal method of revascularization for select patients. In this article, we will review the use of NAIS for primary and secondary aortic infections. In particular, we will emphasize procedural details to help enable the reader to apply this procedure most effectively to their own patients.