380 research outputs found
Structures and Magnetic Properties of Tm1-yYyMn1-xCoxO3
Get PDFThe structure and magnetic properties of Tm1−y Y y Mn1−x Co x O3 with 0 ≦ x ≦ 0.5 and 0 ≦ y ≦ 0.3 were investigated by X-ray diffraction, specific heat and magnetization measurements. Thulium manganite TmMnO3 prepared by solid-state synthesis at ambient pressure is hexagonal and antiferromagnetic with a Nèel temperature T N of 86 K. The substitution of Y for Tm in TmMnO3 does not greatly affect the fundamental hexagonal structure. The magnetization and specific heat measurement results for Tm1−y Y y MnO3 can be qualitatively explained in terms of the dilution effect of Tm by Y. On the other hand, the structure of TmMn1−x Co x O3 changes gradually from hexagonal to orthorhombic with the substitution of Co for Mn; hexagonal and orthorhombic phases coexist in samples for x ≦ 0.3 whereas TmMn0.6Co0.4O3 is almost a single orthorhombic phase. The magnetization of TmMn0.6Co0.4O3 in a field of 250 Oe increases rapidly at about 60K with decreasing temperature. The difference between zero-field-cooled (ZFC) and field-cooled (FC) magnetizations increases remarkably at about 60 K. Moreover, the temperature dependences of the ZFC and the FC magnetizations exhibit peaks at about 40 and 30K, respectively. Thus, TmMn1−x Co x O3 exhibits complex magnetic properties
Statistics of seismic cluster durations
Full text linkUsing the standard ETAS model of triggered seismicity, we present a rigorous
theoretical analysis of the main statistical properties of temporal clusters,
defined as the group of events triggered by a given main shock of fixed
magnitude m that occurred at the origin of time, at times larger than some
present time t. Using the technology of generating probability function (GPF),
we derive the explicit expressions for the GPF of the number of future
offsprings in a given temporal seismic cluster, defining, in particular, the
statistics of the cluster's duration and the cluster's offsprings maximal
magnitudes. We find the remarkable result that the magnitude difference between
the largest and second largest event in the future temporal cluster is
distributed according to the regular Gutenberg-Richer law that controls the
unconditional distribution of earthquake magnitudes. For earthquakes obeying
the Omori-Utsu law for the distribution of waiting times between triggering and
triggered events, we show that the distribution of the durations of temporal
clusters of events of magnitudes above some detection threshold \nu has a power
law tail that is fatter in the non-critical regime than in the critical
case n=1. This paradoxical behavior can be rationalised from the fact that
generations of all orders cascade very fast in the critical regime and
accelerate the temporal decay of the cluster dynamics.Comment: 45 pages, 15 figure
Quasi-distributed vibration sensing using OFDR and weak reflectors
Get PDFThe authors proposed a quasi-distributed vibration sensing technique using in-line weak reflectors and optical frequency domain reflectometry (OFDR). As a result, they achieved an 8 kHz measurable vibration frequency with a 15-20 cm spatial resolution employing a low repetition rate (similar to 8 Hz). Moreover, a measurable frequency of 30 kHz was achieved for a 1.5 m spatial resolution. The ability of the system to determine the frequency and amplitude of several sections vibrating simultaneously is evaluated for different configurations. Because of the simple arrangement, high detectable frequency, and high sensitivity, this approach is expected to be especially well suited for mechanical vibration sensing applications, particularly in medium-sized structures.Ministerio de Economía, Industria y Competitividad, Gobierno de España (TEC2016-76021-C2-1)
A Fiber Optic Doppler Sensor and Its Application in Debonding Detection for Composite Structures
Get PDFDebonding is one of the most important damage forms in fiber-reinforced composite structures. This work was devoted to the debonding damage detection of lap splice joints in carbon fiber reinforced plastic (CFRP) structures, which is based on guided ultrasonic wave signals captured by using fiber optic Doppler (FOD) sensor with spiral shape. Interferometers based on two types of laser sources, namely the He-Ne laser and the infrared semiconductor laser, are proposed and compared in this study for the purpose of measuring Doppler frequency shift of the FOD sensor. Locations of the FOD sensors are optimized based on mechanical characteristics of lap splice joint. The FOD sensors are subsequently used to detect the guided ultrasonic waves propagating in the CFRP structures. By taking advantage of signal processing approaches, features of the guided wave signals can be revealed. The results demonstrate that debonding in the lap splice joint results in arrival time delay of the first package in the guided wave signals, which can be the characteristic for debonding damage inspection and damage extent estimation
Low fat intake is associated with pathological manifestations and poor recovery in patients with hepatocellular carcinoma
Get PDFBACKGROUND: This study aimed to clarify whether dietary deviation is associated with pathological manifestations in hepatocellular carcinoma (HCC) patients. METHODS: Dietary intake was estimated in 35 HCC cases before and after hospitalization by referencing digital camera images of each meal. Pathological conditions were evaluated in nitrogen balance, non-protein respiratory quotient (npRQ), neuropsychiatric testing and recovery speed from HCC treatment. RESULTS: On admission, nitrogen balance and npRQ were negative and less than 0.85, respectively. Five patients were judged to have suffered from minimal hepatic encephalopathy that tended to be associated with a lowered value of npRQ (p = 0.082). The energy from fat intake showed a tendency of positive correlation with npRQ (p = 0.11), and the patients with minimal hepatic encephalopathy took significantly fewer energy from fat (p = 0.024). The energy difference from fat between diets at home versus those in the hospital showed a significant positive correlation with npRQ change after admission (p = 0.014). The recovery speed from invasive treatments for HCC showed a significant negative correlation with npRQ alteration after admission (p = 0.0002, r = −0.73). CONCLUSIONS: These results suggest the lower fat intake leads to deterioration of energy state in HCC patients, which associates with poor recovery from invasive treatments and various pathological manifestations
Mapping of panda plumage color locus on the microsatellite linkage map of the Japanese quail
Get PDFBACKGROUND: Panda (s) is an autosomal recessive mutation, which displays overall white plumage color with spots of wild-type plumage in the Japanese quail (Coturnix japonica). In a previous study, the s locus was included in the same linkage group as serum albumin (Alb) and vitamin-D binding protein (GC) which are mapped on chicken (Gallus gallus) chromosome 4 (GGA4). In this study, we mapped the s locus on the microsatellite linkage map of the Japanese quail by linkage analysis. RESULTS: Segregation data on the s locus were obtained from three-generation families (n = 106). Two microsatellite markers derived from the Japanese quail chromosome 4 (CJA04) and three microsatellite markers derived from GGA4 were genotyped in the three-generation families. We mapped the s locus between GUJ0026 and ABR0544 on CJA04. By comparative mapping with chicken, this locus was mapped between 10.0 Mb and 14.5 Mb region on GGA4. In this region, the endothelin receptor B subtype 2 gene (EDNRB2), an avian-specific paralog of the mammalian endothelin receptor B gene (EDNRB), is located. Because EDNRB is responsible for aganglionic megacolon and spot coat color in mouse, rat and equine, EDNRB2 is suggested to be a candidate gene for the s locus. CONCLUSION: The s locus and the five microsatellite markers were mapped on CJA04 of the Japanese quail. EDNRB2 was suggested to be a candidate gene for the s locus
Microsatellite loci in Japanese quail and�cross-species amplification in�chicken and�guinea fowl
Get PDFIn line with the Gifu University's initiative to map the Japanese
quail genome, a total of 100 Japanese quail microsatellite markers
isolated in our laboratory were evaluated in a population of 20
unrelated quails randomly sampled from a colony of wild quail
origin. Ninety-eight markers were polymorphic with an average of 3.7
alleles per locus and a mean heterozygosity of 0.423. To determine the
utility of these markers for comparative genome mapping in
Phasianidae, cross-species amplification of all the markers was tested
with chicken and guinea fowl DNA. Amplification products similar in
size to the orthologous loci in quail were observed in 42 loci in
chicken and 20 loci in guinea fowl. Of the cross-reactive markers,
57.1% in chicken and 55.0% in guinea fowl were polymorphic when tested
in 20 birds from their respective populations. Five of 15 markers that
could cross-amplify Japanese quail, chicken, and guinea fowl DNA were
polymorphic in all three species. Amplification of orthologous loci
was confirmed by sequencing 10 loci each from chicken and guinea fowl
and comparing with them the corresponding quail sequence. The
microsatellite markers reported would serve as a useful resource base
for genetic mapping in quail and comparative mapping in Phasianidae
Extramammary Paget's disease with ureteral metastasis: A case report
Get PDFExtramammary Paget's disease (EMPD) is a skin cancer that can metastasize to distant lymph nodes and organs. However, there are no reports showing histological evidence of metastasis to the ureter. Here we report a case of EMPD that metastasized to the ureter in an 80-year-old man. The primary EMPD was resected and the right inguinal lymph node metastasis was dissected. Radiation therapy was administered around the right inguinal lymph nodes postoperatively. Four years later, a thickening of the wall of the right ureter was found, and a total right nephroureterectomy was performed due to suspicion of primary ureteral cancer. Histological examination showed nests of atypical cells in the renal adventitia and the surrounding lymphatic vessels, muscular layer and mucosal layer, but not in the ureteral epithelium. Immunohistochemical staining of tumour cells was positive for carcinoembryonic antigen, cytokeratin 7 and gross cystic disease fluid protein-15 and was negative for cytokeratin 20. These results are consistent with a primary skin lesion. Although EMPD is not a frequent source of ureteral metastasis, EMPD can metastasize to the ureter. This case implies the feasibility of an accurate preoperative diagnosis through immunostaining, offering the potential to circumvent nephroureterectomy and instead facilitate appropriate management using a ureteral stent.JEADV Clinical Practice, 3(2), pp.678-682; 2023journal articl
New Mid-Infrared Diagnostic of the Dusty Torus Model for Seyfert Nuclei
Get PDFWe propose a new diagnostic of the ``dusty torus'' model for Seyfert nuclei. Dust grains in the torus are heated by the nuclear continuum, and reradiate mostly in the mid-infrared wavelengths. From the torus geometry, it is predicted that the emission at lambda 10 micron, we study the flux ratio between 3.5 micron (L band) and 25 micron; R(L,25) = log [(nu_3.5 um S_nu_3.5 um)/(nu_25 um S_nu_25 um)]. In three different samples (optically selected, X-ray selected, and infrared selected samples) of Seyfert galaxies, the observed values of R(L,25) between type 1 Seyferts (S1s) and type 2 Seyferts (S2s) are found to be clearly separated; R(L,25) > -0.6 for S1s while R(L,25) < -0.6 for S2s. This implies universality of their torus properties. With this result and the other observational characteristics, we investigate the most plausible torus model among those presented in Pier & Krolik (1992, 1993)
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