16 research outputs found
Whiteness, Racial Trauma, and the University
No full textIn this book Harshad Keval offers an intensely personal testimony of racial trauma within the academy. Proposing the theoretical model of “white narcissistic structures” the author traces the paradox of academic institutions simultaneously embracing a progressive and neo-liberal “cos-play” while continuing to generate and maintain racial trauma
Numerical simulations for turbulent oil-water core-annular flow
No full textThe transportation of high viscosity oil is an ongoing research topic for quite some years because of its importance in industrial applications and the increasing energy requirements of the world population. The water lubricated oil core with a core-annular flow configuration is a viable option for the transport of high viscosity oil. It was observed that there are significant differences between the predictions from the RANS simulations and the experimental data for turbulent oil-water core-annular flow obtained in the flow loop in the lab at TU Delft. Thus, this study is performed to understand the difference between the RANS simulations and the experimental data. 1D and 2D OpenFOAM simulations for turbulent vertical core-annular flow are performed using the Launder-Sharma low-Re k-ε turbulence model. The pressure drop and the oil holdup are imposed while the total flow rate and the water-cut is obtained as the output from the simulations. The results from the OpenFOAM simulations are compared with the DNS data available in literature to understand the impact of the turbulence characteristics and the interfacial waves. Both 1D and 2D simulations were carried out. The 1D model does not include the interface waves. The 2D axisymmetric model is able to capture the travelling interface waves. The 1D OpenFOAM simulations are carried out for five cases with different oil holdups and the results are compared with the asymptotic wall laws. It is concluded that the turbulence is sufficiently resolved by the 1D simulations. The 2D simulations are also performed for five different oil holdups. The 2D simulations are first validated by performing grid independence tests. The dependence of the simulation results on the streamwise domain length, presence of gravity and oil viscosity is also analysed. It was found that the streamwise domain length and the oil viscosity used does not have a significant influence on the prediction of the results. The comparison of the RANS simulations with the DNS data shows that the difference depends on the turbulence levels inside the simulation domain. The difference for the total flow rate between the 2D OpenFOAMsimulations and the DNS data is found to be 10% for fully turbulent core-annular flow while the difference increases to 29% for core-annular flow with no turbulence. The friction factor for the 2D Open- FOAM simulations is found to be about 17% lower for fully turbulent flow while it is 39% lower than the DNS predictions for the simulation with no turbulence. The difference for the holdup ratio (when comparing 2D OpenFOAM simulations with respect to DNS) decreases first from 15% higher for the low oil holdup cases to 8% higher for simulation with oil holdup fraction 0.71 and then increases to 14% higher for the highest oil holdup case. It is also observed from the comparison of the mean streamwise velocities and the mean shear stresses that the turbulence level in the simulation domain impact the extent of the difference. The agreement in the wave characteristics between the 2D OpenFOAM simulations and the DNS data depends on the mixture of wavelengths present in the simulation domain. The RANS simulations predict a specific dominant wavelength while the DNS data gives a mixture of wavelengths for lower oil holdups. The dominance of a specific wavelength increases with increasing oil holdup for the DNS predictions.Mechanical Engineering | Energy, Flow and Process Technolog
Scrotal Lymphatic Filariasis: A Rare Clinical Image
No full textA 50-year-old man presented with a large, lobulated swelling of
the scrotum that had been persisting for two years. This swelling
developed slowly, increasing over time, and was accompanied by
a foul-smelling discharge. Examination revealed a scrotum covered
in nodules, significantly enlarged but with a soft to firm consistency.
The scrotal skin was entirely affected, while the penis remained
normal-sized and shaped, with no sign of inguinal lymphadenopathy
[Table/Fig-1]. The patient underwent surgery to remove the lobulated
mass, followed by skin grafting and covering of the testis with dartos
fascia. The operation proceeded smoothly, and histopathological
analysis confirmed a diagnosis of scrotal lymphatic filariasis
Extracapsular excision of retroperitoneal ancient schwannoma: A case report
No full textSchwannomas are tumors originating from Schwann cells in the nerve sheath. They are generally solitary and encapsulated, but they are rarely seen in the retroperitoneal region. We report a 40-years-old woman with dull aching pain for two months without urinary symptoms. Following imaging studies, a well-encapsulated, retroperitoneal mass complicated with intratumoral bleed and necrosis was found.
Complete surgical resection was performed with preservation of adjacent viscera. The histopathology report confirmed the tumor as an ancient schwannoma. Careful preoperative surgical planning and meticulous surgical skill, along with the application of ERAS protocol, are essential to prevent morbidity and mortality. No evidence of recurrence during a follow-up period of three years was seen. Further studies with long-term follow-up are warranted for appropriate management protocol development
Battery plug-in electric car : (design and integration of suspension and braking systems)
No full textThe world has been facing the persistent problem of global warming. Environmental pollution is engulfing problem faced by the mankind today and it is deteriorating the health of the living population. Exhaust gases released by the conventional internal combustion engine driven vehicles are one of the major sources of these problems today.
By 2020, it is estimated that the total number of vehicles in the world will be around 1.8 billion. And the constant increase in oil prices have obliged for the application of a sustainable & alternative mobility technology. Plug-in and hybrid vehicles are some really good alternatives present today and will play a crucial role in the near future.
This project is an initiative by Nanyang Technological University (NTU), Singapore in research and development of an electric car designed by the students. Electric car are gaining high ground across the world as they are more eco-friendly and emit no harmful gases. NTU’s BEV (Battery electric vehicle) is an electric car designed & developed as an urban concept and Singapore having small geographical area makes it an ideal place for adaption of electric cars. Two teams have worked on this project in the last two years and made significant progress. The author was one of the team member of current BEV team who worked on the BEV as a part of his final year project. The author designed, fabricated and integrated suspension and brake systems of the BEV. This report includes detailed explanations on design & fabrication processes of suspension and brake systems of the BEV.Bachelor of Engineering (Mechanical Engineering
"Waving The Wand": Exploring the Healing Narratives of People With Experiences of Self-Harm.
No full textThis study is a narrative analysis of the written stories of 10 people, including the author, all of whom negotiated with a process of healing in the context of self-harm. The purpose of the research was to explore and elucidate alternative narratives about individuals who self-harm within the context of healing, stories which are sometimes obscured by the dominant pathologising discourse of self-harm present in psychiatry. A narrative approach was taken as it focuses on the person’s own story from their perspective, and can facilitate the uncovering of enabling, meaningful and ethical narratives. The analysis highlighted three primary narrative forms - healing as reconciliation, healing as empowerment and healing as an ongoing struggle. These narrative forms suggest that although there are different pathways that people take in their healing journeys, four commonalities existed across accounts. These included multiple meanings of self-harm, demonstrating how healing is attempted and occurs through self-harm; negotiations with the self to minimise harm and substitute self-harm for less ‘harmful’ behaviours; development and expansion of identity; and self in relation to others. The study highlights that healing is a context and meaning driven process that is ongoing and dynamic and as such is part of the very fabric of participants’ lives. The findings highlight the role of oppression, injustice and powerlessness that are often inextricably linked to self-harm and supports the need for a more critically informed clinical approach that addresses social disadvantage in self-harm prevention
At war with their bodies or at war with their minds? A glimpse into the lives and minds of female yo-yo dieters - the curtain has lifted in the UK
No full textYo-yo dieting is a common phenomenon yet little interdisciplinary research has been carried out on dieting, food and nutrition in the social context. This study investigated the effects of yo-yo dieting on social and psychological well-being using qualitative methods. Data were collected by conducting semi-structured interviews with women who yo-yo diet. A total of 9 participants, 20-51 years old, were recruited by purposive and snowball sampling techniques from the University of Roehampton, London, U.K., where the first author was a student at the time of the study. Thematic analysis derived four major themes: the physical and/or mental impact of yo-yo dieting, the similarity of reported symptoms with those associated with eating disorders, familial and sociocultural pressure for initiating diets and the struggle for control and/or identity. Furthermore, there appears to be a link between yo-yo dieting and interviewees’ references to depressive mood episodes. The implications of these findings for the risks of developing eating disorders are discussed
"Waving The Wand": Exploring the Healing Narratives of People With Experiences of Self-Harm.
No full textThis study is a narrative analysis of the written stories of 10 people, including the author, all of whom negotiated with a process of healing in the context of self-harm. The purpose of the research was to explore and elucidate alternative narratives about individuals who self-harm within the context of healing, stories which are sometimes obscured by the dominant pathologising discourse of self-harm present in psychiatry. A narrative approach was taken as it focuses on the person’s own story from their perspective, and can facilitate the uncovering of enabling, meaningful and ethical narratives. The analysis highlighted three primary narrative forms - healing as reconciliation, healing as empowerment and healing as an ongoing struggle. These narrative forms suggest that although there are different pathways that people take in their healing journeys, four commonalities existed across accounts. These included multiple meanings of self-harm, demonstrating how healing is attempted and occurs through self-harm; negotiations with the self to minimise harm and substitute self-harm for less ‘harmful’ behaviours; development and expansion of identity; and self in relation to others. The study highlights that healing is a context and meaning driven process that is ongoing and dynamic and as such is part of the very fabric of participants’ lives. The findings highlight the role of oppression, injustice and powerlessness that are often inextricably linked to self-harm and supports the need for a more critically informed clinical approach that addresses social disadvantage in self-harm prevention
At War with Their Bodies or At War with Their Minds? A Glimpse into the Lives and Minds of Female Yo-Yo Dieters – The Curtain has Lifted in U.K.?
No full textYo-yo dieting is a common phenomenon yet little interdisciplinary research has been carried out on dieting, food and nutrition in the social context. This study investigated the effects of yo-yo dieting on social and psychological well-being using qualitative methods. Data were collected by conducting semi-structured interviews with women who yo-yo diet. A total of 9 participants, 20-51 years old, were recruited by purposive and snowball sampling techniques from the University of Roehampton, London, U.K., where the first author was a student at the time of the study. Thematic analysis derived four major themes: the physical and/or mental impact of yo-yo dieting, the similarity of reported symptoms with those associated with eating disorders, familial and sociocultural pressure for initiating diets and the struggle for control and/or identity. Furthermore, there appears to be a link between yo-yo dieting and interviewees’ references to depressive mood episodes. The implications of these findings for the risks of developing eating disorders are discussed
