1,355 research outputs found
[[alternative]]The KT transition of YBCO films
No full text[[abstract]]我們想藉由觀察 YBaCuO 薄膜是否有 KT 變遷的現象,來瞭解薄膜厚度與
維度的關係。故我們製作二塊不同厚度 (240o,120o) 的薄膜,分別量測它
們的電阻率與 V-I 曲線, 並加以分析。其中240o 之 YBCO 薄膜由於厚度
較大,無法表現二維的行為。而120o 的薄膜其 V-I 曲線相關的次方定律
V=I,在 T<76.6K 時, n 滿足二維 Ginzberg- Landau 之線性關係式: n(
T)≒1+const(1-T/Tco)。以此直線與 n=1 之交點定出樣品的 T=79K。而
在n(T)約為5.1時, n 不再隨上述的線性關係式隨溫度下降,亦即發生了
KT 變遷中普遍躍遷的現象。我們分別以 n=3及 n=5.1 定出兩種不同的
Tkt, 來討論電阻率的結果。由電阻率的結果分析,無論那種決定 Tkt 的
方法在介於78.1及78.6K 間,其ln(R/Rn)與[(Tco-T)/(T-Tkt)]成線性關係
。亦就是出現 KT 理論中預測因二維渦流運動產生的特殊行為。所以其具
有二維的傳導現象。
In order to know the dimensionalities of YBCO films, we
measured the resistivities and I-V curves of two YBCO films(120
o,240o). According to our results,the film of 240o thickness
couldn't show the 2d behaviors.The power law of 120o film has
the universal jump phenomena and the resisti- vity behavior can
be explained by 2d free vortices mo- tion.We can say that the
YBCO film of 120o thickness is a 2d system.
In order to know the dimensionalities of YBCO films, we
Numerical analysis and discussion on the hot-spot stress concept applied to welded tubular KT joints
No full textNominal stresses have been used for a long time for the assessment of fatigue resistance of welded joints, however, this approach has strong limitations since the definition of the nominal stress may be subjective for complex welded details and/or complex loading. On the other hand, the hot-spot stress approach has been proposed to overcome these limitations considering the structural geometrical discontinuities. However, the hot-spot stress methods also present certain limitations, and the present study aims at evaluating the available numerical and analytical hot-spot stress methods proposed by DNVGL (2016) and IIW (2014). The particular case of an offshore tubular KT joint has been considered herein and discretized in two planes. It has been studied numerically using the ABAQUS software coupled with the hot-spot stress extrapolation methods described in IIW (2014) and DNVGL (2016). The influence of the weld geometry has been considered and evaluated. In addition to the numerical method, the present study has also considered the analytical approach proposed in DNVGL (2016) derived from the combination of Efthymiou solutions for the stress concentration factor with the method of superposition of stresses. The numerical models according to IIW (2014) have been found to be more conservative when compared with the mesh-size methods proposed by DNVGL (2016), both in numerical modelling without the weld or with weld. For the numerical models with weld cord, the mean values of normalized difference index obtained for all braces together, as a result of comparing numerical results with analytical solutions, are lower, when compared with results obtained from the numerical models without weld cord.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Steel & Composite Structure
Effect of Stress Ratio(R) and Stress Concentration Factor (Kt) on Fatigue Properties of WSTi6211 Titanium Alloy
No full textIn this paper, the author studied the effects of different stress ratios（R） and stress concentration factors(Kt) on the fatigue properties of WSTi6211 titanium alloy.Through S-N curve, the author obtained the fatigue ultimate strength of the material under different conditions and analyzed characteristics of fatigue fractures, including the crack source sourse, the crack growth region and the final rupture region. The results show that when Kt=1, R=0.5, the fatigue ultimate strength σD is 626MPa; when Kt = 1, R=0.06, the fatigue ultimate strength σD is 527.5MPa; when Kt=3, R=0.06, the ultimate fatigue strength σD is 267MPa. Fatigue performance is very sensitive to R and Kt. The larger R is, the larger the fatigue ultimate strength is. The larger Kt is, the smaller the fatigue limit strength is. The fracture morphology shows typical fatigue fracture morphology. Most of the cracks originate on the surface of specimens and have typical fatigue bands. With the decrease of stress, the area of crack growth zone increases
Effect of Stress Ratio(R) and Stress Concentration Factor (Kt) on Fatigue Properties of WSTi6211 Titanium Alloy
No full textIn this paper, the author studied the effects of different stress ratios（R） and stress concentration factors(Kt) on the fatigue properties of WSTi6211 titanium alloy.Through S-N curve, the author obtained the fatigue ultimate strength of the material under different conditions and analyzed characteristics of fatigue fractures, including the crack source sourse, the crack growth region and the final rupture region. The results show that when Kt=1, R=0.5, the fatigue ultimate strength σD is 626MPa; when Kt = 1, R=0.06, the fatigue ultimate strength σD is 527.5MPa; when Kt=3, R=0.06, the ultimate fatigue strength σD is 267MPa. Fatigue performance is very sensitive to R and Kt. The larger R is, the larger the fatigue ultimate strength is. The larger Kt is, the smaller the fatigue limit strength is. The fracture morphology shows typical fatigue fracture morphology. Most of the cracks originate on the surface of specimens and have typical fatigue bands. With the decrease of stress, the area of crack growth zone increases
Anemia and undernutrition among children aged 6–23 months in two agroecological zones of rural Ethiopia
No full textKedir Teji Roba,1 Thomas P O’Connor,2 Tefera Belachew,3 Nora M O’Brien2 1School of Nursing and Midwifery, College of Health and Medical Science, Haramaya University, Harar, Ethiopia; 2School of Food and Nutritional Science, University College Cork, Cork, Ireland; 3Department of Population and Family Health, College of Public Health and Medical Sciences, Jimma University, Jimma, Ethiopia Background: Child malnutrition during the first 1,000 days, commencing at conception, can have lifetime consequences. This study assesses the prevalence of anemia and undernutrition among children aged 6–23 months in midland and lowland agroecological zones of rural Ethiopia.Methods: Cross-sectional data examining sociodemographic, anthropometry, hemoglobin levels, and meal frequency indicators were collected from 216 children aged 6–23 months and their mothers randomly selected from eight rural kebele (villages).Results: Of 216 children, 53.7% were anemic, and 39.8%, 26.9%, and 11.6% were stunted, underweight, and wasted, respectively. The prevalence of anemia was higher in the lowland agroecological zone (59.5%) than the midland (47.6%). Among those children who were stunted, underweight, and wasted, 63.5%, 66.7%, and 68.0% were anemic, respectively. Child anemia was significantly associated with the child not achieving minimum meal frequency, sickness during the last 2 weeks before the survey, stunting and low body mass index, and with maternal hemoglobin and handwashing behavior. The prevalence of stunting was higher in the lowland agroecological zone (42.3%) than the midland (36.2%). The predictors of stunting were age and sex of the child, not achieving MMF, maternal body mass index, and age. As maternal height increases, the length for age of the children increases (P=0.003).Conclusion: The overall prevalence of anemia and undernutrition among children aged 6–23 months in these study areas is very high. The prevalence was higher in the lowland agroecological zone. Health information strategies focusing on both maternal and children nutrition could be sensible approaches to minimize stunting and anemia. Keywords: child anemia, child stunting, lowland, midland, agroecological zone, rural Ethiopi
Iodine deficiency and its associated factors among primary school children in Anchar district, Eastern Ethiopia
No full textMuzemil Muktar,1 Kedir Teji Roba,2 Bezatu Mengistie,3 Berhe Gebremichael4 1West Hararghe Zone Health Department, Chiro, Ethiopia; 2School of Nursing and Midwifery, Haramaya University, Harar, Ethiopia; 3Department of Environmental Health Science, Haramaya University, Harar, Ethiopia; 4School of Public Health, Haramaya University, Harar, Ethiopia Background: Iodine deficiency is a major public health problem in Ethiopia. Most of the studies in Ethiopia were done on clinical goiter without assessing the subclinical iodine deficiency. Therefore, there was a need to study the magnitude and associated factors of iodine deficiency among school-age children in Eastern Ethiopia. Subjects and methods: A school-based cross-sectional study design was used to assess the iodine level of 200 primary school children aged 6–12 years who were selected by using the multistage sampling technique. The study used an interview-administered questionnaire and checklists to collect data from the respondents. Data were entered to EpiData version 3.1 and exported to SPSS version 22.0 for analysis. Bivariable and multivariable analyses were conducted, and statistical significance was declared at p value ≤0.05. Results: The median urinary iodine concentration of the children was 146 µg/L, and 31% had median urinary iodine concentration below the acceptable level (<100 µg/L). Female sex (adjusted odds ratio [AOR]=3.12, 95% CI: 1.52, 6.39), family size ≥5 (AOR=2.24, 95% CI: 1.06, 4.75), having no awareness of a balanced diet (AOR=3.25, 95% CI: 1.37, 7.71), and cabbage ­consumption ≥2 times per week (AOR=3.01, 95% CI: 1.31, 6.93) were the significant associated factors. Conclusion and recommendation: Ethiopia is implementing the universal iodization of salt. However, urinary iodine deficiency and utilization of inadequately iodized salt were high in the study area. Therefore, the health sectors of the study site should disseminate messages to increase the awareness on iodized salt, iodine-rich foods, and goiterogens. Keywords: iodine deficiency, primary school, children, Anchar distric
BARYON MAGNETIC-MOMENTS WITH CONFINED QUARKS
No full textAstronomy & AstrophysicsPhysics, Particles & FieldsSCI(E)0ARTICLE3920-9234
XI(2230) IS LIKELY TO BE A GLUEBALL
No full textOn the basis of the recent results of xi(2230) --> pi(+)pi(-), p (p) over bar and xi(2230) --> K+K-, KsKs, measured by the BES Collaboration in J/psi radiative decays, combined with the PS185 experiment of p (p) over bar --> xi(2230) --> K (K) over bar, we argue that because of its very narrow partial decay widths to pi pi and K (K) over bar (less than 1 MeV), its large production rate in J/psi radiative decays (BR(J/psi --> gamma xi) > 2.3 x 10(-3) and its flavor-symmetric couplings to pi pi and K (K) over bar, the xi(2230) is very likely to be a J(PC) = (even)(++) glueball.Physics, MultidisciplinarySCI(E)中国科学引文数据库(CSCD)17ARTICLE3373-3762
PELAKSANAAN DINAS JAGA DI MV. KT 06
No full textABSTRAKSI
Fikki Chandra Dwiana. 52155621 N. “Pelaksanaan dinas jaga di MV. KT 06“. skripsi Program Studi Nautika, Program Diploma IV, Politeknik Ilmu Pelayaran Semarang, Dosen Pembimbing I: Capt. Dwi Antoro, MM, M.Mar, Dosen Pembimbing II: Yustina Sapan, S.ST, MM.
Mualim jaga memiliki peranan penting dalam pelaksanaan dinas jaga baik dinas jaga laut, dinas jaga berlabuh jangkar dan dinas jaga bongkar muat untuk menghindari hal-hal yang tidak diinginkan dalam pelaksanaannya. Perumusan masalah yang diambil penulis dalam skripsi ini adalah pelaksanaan dinas jaga di MV. KT 06, kendala-kendala dalam pelaksanaan dinas jaga dan upaya-upaya dalam mengatasi kendala-kendala tersebut.
Dalam penulisan skripsi ini, peneliti menjabarkan teoretis tentang pelaksanaan dinas jaga yang digunakan dalam pembuatan laporan penelitian dan sebagai landasan untuk memecahkan masalah yang ada dalam proses penelitian utamanya terkait dengan pengertian pelaksanaan, dinas jaga, perwira jaga laut, perwira jaga pelabuhan dan Nakhoda.
Dengan metode penelitian kualitatif yang mengahasilkan data deskriptif, pelaksanaan dinas jaga dapat digambarkan secara jelas dan nyata karena data diperoleh dari interview secara langsung serta ditunjang metode kepustakaan yang memberikan gambaran lebih jelas mengenai gambaran yang lebih jelas mengenai informasi yang disampaikan.
Hasil yang didapat penulis selama melakukan penelitian adalah pelaksanaan dinas jaga di kapal belum berjalan dengan optimal karena kurangnya rasa tanggung jawab petugas jaga dalam pelaksanaan dinas jaga, kelalaian petugas jaga, kondisi fisik yang tidak prima, dan kurangnya rasa percaya diri. Pembahasan terhadap hasil penelitian adalah pelaksanaan tugas jaga harus benar-benar diaplikasikan sesuai dengan STCW 1978 as amended in 1995 dan MLC 2006, Mualim juga harus berpedoman pada Collision Regulation 1972 dalam pelaksanaan dinas jaga laut supaya tidak ada kendala dalam pelaksanaannya.
Dalam simpulan saran peneliti memberikan beberapa pendapat yang dapat melengkapi penelitian, perlunya peningkatan tentang pengawasan dan pelaksanaan dinas jaga, Perbaikan regulasi oleh perusahaan sesuai aturan internasional terbaru, serta pelaksanaan upaya yang harus dioptimalkan merupakan saran peneliti terhadap objek permasalahan yang ada.
ABSTRACT
Fikki Chandra Dwiana. 52155621 N. "Implementation of Watchkeeping on MV. KT 06", Nautical Study Program thesis, Diploma IV Program, Politeknik Ilmu Pelayaran Semarang, Supervisor I: Capt. Dwi Antoro, MM, M.Mar, Advisor II: Yustina Sapan, S.ST, MM.
Officer on watch has an important role in the implementation of watchkeeping both watchkeeping at sea, anchorage and port to avoid undesirable things in their implementation. The formulation of the problem taken by the writer in this thesis is the implementation of watchkeeping on MV. KT 06, the obstacles in the implementation of watchkeeping and the efforts in overcoming these obstacles.
In writing this thesis, researchers describe the theoretical implementation of the watchkeeping used in making research reports and as a basis for solving problems that exist in the research process mainly related to the understanding of implementation, watchkeeping, officer on watch, port watch officers and Master.
With qualitative research methods that produce descriptive data, the implementation of watchkeeping can be clearly described because data is obtained from direct interviews and supported by the library method that provides a clearer picture of the information submitted.
The results obtained by the author during the study are the implementation of watchkeeping on the ship has not been running optimally because of the lack of a sense of responsibility of the duty officer in the implementation of the watchkeeping, physical conditions that are not prime, and lack of confidence. Discussion of the results of the research is that the implementation of watchkeeping must be strictly applied in accordance with the 1978 STCW as amended in 1995 and MLC 2006, Officer must also be guided by the 1972 Collision Regulation in implementing watchkeeping at sea so that there are no obstacles in its implementation.
In the conclusion of the suggestion the researcher provides several opinions that can complement the research, the need for improvement regarding supervision and implementation of the watchkeeping, improvement of regulations by companies in accordance with the latest international rules, and the implementation of efforts that must be optimized is the researcher's suggestion of the object of existing problems
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