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Scaled Boundary Finite Element Method for Various Crack Problems
Santosh Shrestha,Mitao Ohga 한국강구조학회 2007 International Journal of Steel Structures Vol.7 No.4
The recently developed scaled boundary finite element method (SBFEM) applied for various 2D linear-elastic crackthe semi-analytical properties of the method, the fracture parameters: stress intensity factors, T-stress and higher order terms,can be more easily computed directly from their definition. Furthermore a quasi-automatic procedure of SBFEM is presentedhere for crack propagation simulation based on linear-elastic fracture mechanics. Since only the domain boundary is requiredto discretize like in boundary element method and also it has its own unique property that the side-face boundaries and nearremeshing requirement, it can be confirmed that the proposed procedure can be aplied to crack propagation analysis moreeasily with relatively coarse and simple model than other computational methods. First, the efficiency and accuracy of theSBFEM to compute stress near crack-tip and fracture parameters are examined by numerical examples both bounded andunbounded with branched crack problems. Then a mixed mode problem for crack propagation analysis is simulated to verifythe proposed procedure. The computed fracture parameters and crack propagation trajectories are in excellent agrement with
Santosh K. Shrestha,M. Wintrebert-Fouquet,H. Timmers,Scott Butcher 한국물리학회 2004 Current Applied Physics Vol.4 No.2-4
Indium nitride thin lms for potential application in high power, high frequency devices have been grown with reactive ionsputtering. Accurate lm stoichiometries have been measured with elastic recoil detection using 200 MeV Au projectile ions. Thebeam-induced depletion of nitrogen during analysis has been found to be severe and non-linear with ion uence. Assuming theformation of molecular nitrogen as the decisive step leading to nitrogen loss, a model has been applied which reproduces the ex-perimental data. The model allows accurate extrapolations of the original nitrogen content of the material. All lms studied havebeen found to be nitrogen-rich and have large band gaps ranging from 2.14 to 2.3 eV. The amount of excess nitrogen correlates withthe band gap energy suggesting a MossBurstein eect. The excess nitrogen may thus act as donor and account for the high chargecarrier concentrations of up to 2· 1020 cm. 3. The magnitude of the nitrogen excess is consistent with a donor level 50 meV below theconduction band.
An efficient computational method for stress concentration problems
Shrestha, Santosh,Ohga, Mitao Techno-Press 2006 Structural Engineering and Mechanics, An Int'l Jou Vol.22 No.5
In this paper a recently developed scaled boundary finite element method (SBFEM) is applied to simulate stress concentration for two-dimensional structures. In addition, a simple and independent formulation for evaluating the coefficients, not only of the singular term but also higher order non-singular terms, of the stress fields near crack-tip is presented. The formulation is formed by comparing the displacement along the radial points ahead of the crack-tip with that of standard Williams' eigenfunction solution for the crack-tip. The validity of the formulation is examined by numerical examples with different geometries for a range of crack sizes. The results show good agreement with available solutions in literatures. Based on the results of the study, it is conformed that the proposed numerical method can be applied to simulate stress concentrations in both cracked and uncracked structure components more easily with relatively coarse and simple model than other computational methods.
Sarker Debashis,Shrestha Sanjana,Tamang Santosh Kumar Baidhya 한국사회복지학회 2022 Asian Social Work and Policy Review Vol.16 No.2
There is no doubt that the sudden outbreak of COVID-19 negatively impacted billions of people worldwide, and among them, people with disabilities became most susceptible. However, little is known about the impact of COVID-19 on the lives of people with disabilities in Nepal. Using empirical data from semi-structured in-depth interviews with people with disabilities, disability specialist, and community leaders, this study discusses the lived experiences of people with disabilities who have been affected by COVID-19 in Nepal. This study revealed that the outbreak of COVID-19 impacted people with disabilities by worsening their vulnerability. In particular, the majority of people with disabilities became further isolated, were disconnected from existing services such as access to information, education, and health care and many lost their income opportunities. Findings from this study further show that this pandemic affected the rights of people with disabilities guided by the United Nations Convention on the Rights of Persons with Disabilities (UNCRPD). Immediate financial and non-financial support for people with disabilities from government and other stakeholders, such as non-governmental organizations (NGOs), is needed, indicating the need for policymakers to reassess policies to ensure that they adequately protect the rights of people with disabilities.
Johnson, Derek Christopher,Bhatta, Madhav Prasad,Gurung, Santosh,Aryal, Shilu,Lhaki, Pema,Shrestha, Sadeep Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.19
Background: This study assessed human papillomavirus (HPV), cervical cancer, and HPV vaccine knowledge and awareness among women in two sub-populations in Nepal - Khokana, a traditional Newari village in the Lalitpur District about eight kilometers south of Kathmandu, and Sanphebagar, a village development committee within Achham District in rural Far-Western Nepal. Methods: Study participants were recruited during health camps conducted by Nepal Fertility Care Center, a Nepali non-governmental organization. Experienced staff administered a Nepali language survey instrument that included questions on socio-demographics, reproductive health and knowledge on HPV, cervical cancer, and the HPV vaccine. Results: Of the 749 participants, 387 (51.7%) were from Khokana and 362 (48.3%) were from Sanphebagar. Overall, 53.3% (n=372) of women were aware of cervical cancer with a significant difference between Khokana and Sanphebagar (63.3% vs 43.0%; p=0.001). Overall, 15.4% (n=107) of women had heard of HPV and 32% (n=34) of these women reported having heard of the HPV vaccine. If freely available, 77.5% of the women reported willingness to have their children vaccinated against HPV. Factors associated with cervical cancer awareness included knowledge of HPV (Khokana: Odds Ratio (OR)=24.5; (95% Confidence Interval (CI): 3.1-190.2, Sanphebagar: OR=14.8; 95% CI: 3.7-58.4)) and sexually transmitted infections (Khokana: OR=6.18; 95% CI: 3.1-12.4; Sanphebagar: OR=17.0; 95% CI: 7.3-39.7) among other risk factors. Conclusions: Knowledge and awareness of HPV, cervical cancer, and the HPV vaccine remains low among women in Khokana and Sanphebagar. Acceptance of a freely available HPV vaccine for children was high, indicating potentially high uptake rates in these communities.