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Electrical Properties of Complex Perovskite Samarium Nickel Titanate
Nishant Kumar,Alo Dutta,S. Prasad,T. P. Sinha 대한금속·재료학회 2013 ELECTRONIC MATERIALS LETTERS Vol.9 No.5
The complex perovskite oxide samarium nickel titanate, Sm(Ni1/2Ti1/2)O3 (SNT) is synthesized by solid-state reaction technique. The x-ray diffraction pattern of the sample at room temperature shows monoclinic phase. The microstructure analysis of the sample is performed using scanning electron microscope. Alternating current impedance spectroscopy is used to investigate the electrical properties of SNT in a temperature range from 313 K to 673 K and in a frequency range from 100 Hz to 1 MHz. A peak is observed in the frequency dependence of imaginary part of electric modulus (M''(ω)) indicating a non-Debye type of relaxation. The relaxation peak of M''(ω) moves towards higher frequencies with the increase of temperature showing the thermally activated nature of the relaxation time. The relaxation times for M''(ω) at different temperatures are found to obey Arrhenius law with an activation energy of 0.57 eV. The scaling behaviour of M''(ω)shows that the relaxation describes the same mechanism at various temperatures. The complex impedance plane plots show that the relaxation mechanism in SNT is purely a bulk effect arising from the semiconductive grains of the sample. The frequency dependent conductivity is found to obey the power law.
Study on Cloud Security Risk and Remedy
Asish Aich,Alo Sen 보안공학연구지원센터 2015 International Journal of Grid and Distributed Comp Vol.8 No.2
Recently, Cloud computing is most powerful research area because of its flexibility and cost efficiency. The environment provides dynamic, easily scalable services. Although cloud computing promises to the organization as well as consumers to make life much easier, still it has considerable level of security issues. When data is transferred between the client and server, then security is a great concern. Efficient model should be implemented in the cloud environment to make it secure from illegitimate users. So that cloud security is becoming a important recent discussion in the IT sector. This paper describes a survey on different security issues of cloud computing and the possible solution for remediation.
Risk Factors for Buruli Ulcer: A Case Control Study in Cameroon
Pouillot, Ré,gis,Matias, Gonç,alo,Wondje, Christelle Mbondji,Portaels, Franç,oise,Valin, Nadia,Ngos, Franç,ois,Njikap, Adelaï,de,Marsollier, Laurent,Fontanet, Arnaud,Eyango Public Library of Science 2007 PLoS neglected tropical diseases Vol.1 No.3
<▼1><P><B>Background</B></P><P>Buruli ulcer is an infectious disease involving the skin, caused by <I>Mycobacterium ulcerans</I>. This disease is associated with areas where the water is slow-flowing or stagnant. However, the exact mechanism of transmission of the bacillus and the development of the disease through human activities is unknown.</P><P><B>Methodology/Principal Findings</B></P><P>A case-control study to identify Buruli ulcer risk factors in Cameroon compared case-patients with community-matched controls on one hand and family-matched controls on the other hand. Risk factors identified by the community-matched study (including 163 pairs) were: having a low level of education, swamp wading, wearing short, lower-body clothing while farming, living near a cocoa plantation or woods, using adhesive bandages when hurt, and using mosquito coils. Protective factors were: using bed nets, washing clothes, and using leaves as traditional treatment or rubbing alcohol when hurt. The family-matched study (including 118 pairs) corroborated the significance of education level, use of bed nets, and treatment with leaves.</P><P><B>Conclusions/Significance</B></P><P>Covering limbs during farming activities is confirmed as a protective factor guarding against Buruli ulcer disease, but newly identified factors including wound treatment and use of bed nets may provide new insight into the unknown mode of transmission of <I>M. ulcerans</I> or the development of the disease.</P></▼1><▼2><P><B>Author Summary</B></P><P>Buruli ulcer (BU) is a neglected tropical infectious disease caused by <I>Mycobacterium ulcerans</I>. While BU is associated with areas where the water is slow-flowing or stagnant, the exact mechanism of transmission of the bacillus is unknown, impairing efficient control programs. Two hypotheses are proposed in the literature: previous trauma at the lesion site, and transmission through aquatic insect bites. Using results from a face-to-face questionnaire, our study compared characteristics from Cameroonian patients with Buruli ulcer to people without Buruli ulcer. This latter group of people was chosen within the community or within the family of case patients. The statistical analysis confirmed some well-known factors associated with the presence of BU, such as wearing short lower-body clothing while farming, but it showed that the use of bed nets and the treatment of wounds with leaves is less frequent in case patients. These newly identified factors may provide new insight into the mode of transmission of <I>M. ulcerans</I>. The implication of domestic or peridomestic insects, suggested by the influence of the use of bed nets, should be confirmed in specific studies.</P></▼2>
Minor Salivary Glands Calculi : An Unusual Case Found in the Hard Palate Mucosa
Roberto, Pippi,Aldo, Severi,Luig, Alo`Piero,Andrea, Pilloni,Bernard, George Korean Academy of Oral Biology and the UCLA Dental 2002 International Journal of Oral Biology Vol.27 No.2
Clinical and histological findings of a very rare case of minor salivary gland calculus located in the hard palate mucosa are presented here. Basic knowledge about minor salivary gland location and secretion are reported and some considerations of differential diagnosis of palatal swellings are explained.
( Pilar Brito Zeron ),( Marta Perez De Lis Novo ),( Soledad Retamozo ),( Lluisa Alos ),( Albert Bove ),( Hoda Gheitasi ),( Belchin Kostov ),( Antoni Siso Almirall ),( Roberto Perez Alvarez ),( Manuel 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Background: To analyze the safety and utility of minor lip biopsy by using the minimally invasive technique, performed in the Department of internal medicine, in patients presenting with immunonegative sicca syndrome. Methods: Prospective analysis of 122 patients (100 women, mean age 60 years) with sicca syndrome and negative anti-Ro/La antibodies in which minimally invasive biopsy of minor salivary glands was performed. Results: The most common histopathological feature consisted of lymphoplasmacytic infi ltration in 57 (47%) patients, followed by fi brosis in 46 (38%) and acinar atrophy in 32 (26%); the type of lymphoplasmacytic infi ltrate was detailed in 53 patients (21 lymphocytic, 20 plasmacytic, and 12 lymphoplasmacytic). According to the lymphocytic classifi cation of Chisholm and Mason, 53 (44%) were classifi ed as normal, 42 (35%) grade I, 11 (9%) grade II, 8 (7%) grade III and 7 (6 %) grade IV. Histopathologic diagnosis were: normal in 46 patients, non-specifi c sialadenitis in 42, primary Sjogren`s syndrome in 26 (15 as the fi nal diagnosis, 11 and probable), and other diagnoses in 6 (fat infi ltration in 5, systemic amyloidosis in 1); no cases of infi ltration by granulomas or IgG4+ were found. The presence of fi brosis was detected more frequently in women (43% vs 14%, p=0.014); the existence of fi brosis (67.70 vs 55.76 years) and acinar atrophy (69.50 vs 56.71 years) correlated with increasing age. No correlation between the degree of infi ltration and diagnostic or immunological features was found. Only 8% patients reported transient adverse events. Conclusions: In 21% of patients with an immunonegative sicca syndrome, a diagnosis of primary SS was confi rmed by minimally invasive biopsy, whereas 35% of patients disclosed a non-specifi c chronic sialadenitis, which could refl ect a “mild” SS that have no place in the current classifi cation criteria of this disease.
Kim, Woo Gyum,Kang, Mi Eun,Lee, Jae Bin,Jeon, Min Ho,Lee, Sungmin,Lee, Jungha,Choi, Bongseo,Cal, Pedro M. S. D.,Kang, Sebyung,Kee, Jung-Min,Bernardes, Gonç,alo J. L.,Rohde, Jan-Uwe,Choe, Wonyoun American Chemical Society 2017 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.139 No.35
<P>Transition-metal-catalyzed or metal-free azide alkyne cycloadditions are methods to access 1,4 or 1,5-disubstituted 1,2,3-triazoles. Although the copper catalyzed cycloaddition to access 1,4-disubstituted products has been applied to biomolecular reaction systems, the azide alkyne cycloaddition to access the complementary 1,5-regioisomers under aqueous and ambient conditions remains a challenge due to limited substrate scope or moisture-/air-sensitive catalysts. Herein, we report a method to access 1,5-disubstituted 1,2,3-triazoles using a Cp2Ni/Xantphos catalytic system. The reaction proceeds both in water and organic solvents at room temperature. This protocol is simple and scalable with a broad substrate scope including both aliphatic and aromatic substrates. Moreover, triazoles attached with carbohydrates or amino acids are prepared via this cycloaddition.</P>
Endoscopy Timing in Patients with Acute Upper Gastrointestinal Bleeding
Gonçalo Alexandrino,Tiago Dias Domingues,Rita Carvalho,Mariana Nuno Costa,Luís Carvalho Lourenço,Jorge Reis 대한소화기내시경학회 2019 Clinical Endoscopy Vol.52 No.1
Background/Aims: The role of very early (≤12 hours) endoscopy in nonvariceal upper gastrointestinal bleeding is controversial. We aimed to compare results of very early and early (12–24 hours) endoscopy in patients with upper gastrointestinal bleedingdemonstrating low-risk versus high-risk features and nonvariceal versus variceal bleeding. Methods: This retrospective study included patients with nonvariceal and variceal upper gastrointestinal bleeding. The primaryoutcome was a composite of inpatient death, rebleeding, or need for surgery or intensive care unit admission. Endoscopy timing wasdefined as very early and early. We performed the analysis in two subgroups: (1) high-risk vs. low-risk patients and (2) variceal vs. nonvariceal bleeding. Results: A total of 102 patients were included, of whom 59.8% underwent urgent endoscopy. Patients who underwent very earlyendoscopy received endoscopic therapy more frequently (p=0.001), but there was no improvement in other clinical outcomes. Furthermore, patients at low risk and with nonvariceal bleeding who underwent very early endoscopy had a higher risk of thecomposite outcome. Conclusions: Very early endoscopy does not seem to be associated with improved clinical outcomes and may lead to poorer outcomesin specific populations with upper gastrointestinal bleeding. The actual benefit of very early endoscopy remains controversial andshould be further clarified.