226 research outputs found
Dimple Tech: A Startup Revolving Around Patented Technology
No full textabstract: While golf has been around for centuries, the technology associated with the game has evolved significantly in an attempt to improve golfers’ scores. Specifically, researchers at Arizona State University (ASU) have looked at the dimple patterns on golf balls. They found that various dimple shapes, sizes, and patterns can have a serious impact on the flight of the ball, thus drastically improving the golfer’s game. This patented technology is the basis of the founding of Dimple Tech, a golf ball technology startup. Dimple Tech was founded by three ASU students in an effort to license the patent to the major golf ball manufacturers (Callaway, Titleist, TaylorMade, etc.). The ultimate goal of this startup was to build traction in any way possible, so the team made a video pitch that was sent to the aforementioned manufacturers. Although no traction came out of it, the project was a success as a market for this product was established and the company has a competitive advantage over other golf companies
A Study of Dimple Characteristics on Golf Ball Drag
No full textAbstractDimples on the golf ball have significant effect on its aerodynamic properties as well as the flight trajectory. The aerodynamic of golf ball is still not fully understood in spite of a significant number of published data in the open literature. Most studies were conducted using the wind tunnel testing and Computational Fluid Dynamics (CFD) simulation. This paper examines the aerodynamic effect of dimple depth on golf balls. 3D printing technology was used to manufacture 11 balls with varied dimple depth. RMIT Aero Wind Tunnel was used to measure the drag forces over a range of wind speeds. It was found that the drag coefficient of golf ball varied significantly due to varied dimple geometry. The results indicate that the increase of the dimple depth ratio or surface roughness of the golf ball can shift the transition to a lower Reynolds number and increase the drag coefficient in transcritical regime. The results also established a positive linear correlation between relative roughness and drag coefficient
Effects of laser dimple texturing on the sliding wear of friction pairs
No full textIn order to reduce the sliding wear of friction pairs under dry friction condition, the surfaces of friction pairs were textured with morphology of dimples using laser etching technique, and the influence of surface micromorphology on the wear rate of friction pairs was studied. The results show that the laser dimple texturing can reduce abrasive wear of the friction pairs when they were in rolling contact and sliding movements, the occurrence of pear-shaped ditches was eliminated and damage of the surface oxide layer was relieved. The well-preserved surface oxide layer would restrain the penetration of air oxygen molecules into the friction pair, thanks to the dense oxide layer, and thereby reduce the wear rate. For the friction pair textured with morphology of etched dimples, the oxide layer is well preserved, its wear rate is reduced, and the oxygen atomic mass percentage on the surface is rather low
Experimental investigation on the effect of dimple-protrusion surfaces in a counter flow heat exchanger
No full textFlat plate heat exchangers are widely used in industrial and domestic applications. Industrial plate type heat exchangers generally operate in the turbulent flow regime. Although, increase in flow speeds leads to higher transport of heat, it also causes a rise in the pressure loss which is undesirable. Therefore, to combat the problem of high pressure drop, this thesis explores the use of a passive enhancement technique to improve heat transfer. The aim of this thesis is to experimentally investigate the effect of dimple-protrusion surfaces in a counter flow type heat exchanger. The flow behavior is studied using Laser Doppler Anemometry and the local heat transfer characteristics are investigated with the help of Infrared thermography. The average Nusselt number and friction factor data is compared with those of a flat plate and it is found that the use of dimple-protrusion surfaces provide maximum improvement in the performance of the heat exchanger by 21% in the laminar-to-turbulent transition regime, at Reynolds number of approximately 2900.Mechanical Engineering | Energy and Process Technolog
sj-docx-1-aph-10.1177_10105395211073052 – Supplemental material for Impact of the COVID-19 Pandemic on Chronic Disease Care in India, China, Hong Kong, Korea, and Vietnam
No full textSupplemental material, sj-docx-1-aph-10.1177_10105395211073052 for Impact of the COVID-19 Pandemic on Chronic Disease Care in India, China, Hong Kong, Korea, and Vietnam by Kavita Singh, Yiqian Xin, Yuyin Xiao, Jianchao Quan, Daejung Kim, Thi-Phuong-Lan Nguyen, Dimple Kondal, Xinyi Yan, Guohong Li, Carmen S. Ng, Hyolim Kang, Hoang Minh Nam, Sailesh Mohan, Lijing L. Yan, Chenshu Shi, Jiayin Chen, Hoa Thi Hong Hanh, Viswanathan Mohan, Sandra Kong, Karen Eggleston, Dorairaj Prabhakaran, Nikhil Tandon, KM Venkat Narayan, Mohammed K Ali, Anjana Ranjit Mohan, Deepa Mohan, Suganthi Jagannathan, Nikhil Srinivasapura Venkateshmurthy, Prashant Jarhyan, Enying Gong, Shangzhi Xiong, Xinyue Chen, Truls Østbye, Ege K. Duman, Benjamin J. Cowling, Tiffany WY Ng, Jingyi Xiao, Gabriel M. Leung, Annie Chang and Richard Liang in Asia Pacific Journal of Public Health</p
CFD analysis of phase-change material-based heat storage with dimple-shaped fins: evaluation of fin configuration and distribution pattern
No full textCopyright © The Author(s) 2022. Phase-change materials (PCMs) have a remarkable potential for use as efficient energy storage means. However, their poor response rates during energy storage and retrieval modes require the use of heat transfer enhancers to combat these limitations. This research marks the first attempt to explore the potential of dimple-shaped fins for the enhancement of PCM thermal response in a shell-and- tube casing. Fin arrays with different dimensions and diverse distribution patterns were designed and studied to assess the effect of modifying the fin geometric parameters and distribution patterns in various spatial zones of the physical domain. The results indicate that increasing the number of dimple fins in the range of 8–32 results in faster heat storage rates by up to 8.7% faster than they would be without the dimple fins. Further improvements of approximately 1.4, 1.2, 1.1, and 1.0% can be obtained by optimizing the position of the first fin section, the spacing between other fin sections, the fin spacing based on the aromatic algorithm, and the use of the staggered fin distribution. The heat storage rate is improved by almost 12% for the best case compared with that of the no-fin case.Al-Mustaqbal University College (MUC), Babylon, Iraq, for funding this work (Grant number MUC- E-0122); Deanship of Scientific Research at King Khalid University for funding this work through Large Groups (Project under grant number RGP. 2/142/43)
Fabrication of Self-Ordered Porous Alumina via Etidronic Acid Anodizing and Structural Color Generation from Submicrometer-Scale Dimple Array
No full textHighly ordered anodic porous alumina with a large-scale cell diameter was successfully fabricated via anodizing in a new electrolyte, etidronic acid (1-hydroxyethane-1,1-diphosphonic acid). High-purity aluminum specimens were anodized in a 0.3 M etidronic acid solution under constant current density and voltage conditions. Etidronic acid anodizing at 210 to 270 V at the appropriate temperature caused the anodic porous alumina to exhibit self-ordering behavior, and periodic nanostructures measuring 530 to 670 nm in cell diameter were fabricated on the aluminum substrate. The self-ordering voltage and the corresponding cell diameter could be increased without burning by systematically increasing the stepwise voltage. Two-step etidronic acid anodizing without nanoimprinting can easily yield the formation of highly ordered anodic porous alumina with a large-scale cell diameter. A submicrometer- scale dimple array fabricated via etidronic acid anodizing and subsequent selective oxide dissolution gave rise to bright structural color with a rainbow distribution
A comparative experimental performance evaluation of solar air collector having absorber plate with convex oval-trench dimple
No full textThe purpose of this research is to examine how convex oval-trench dimples placed staggered on a solar air collector's absorber improved vortex heat transfer. At air mass flow rates of 0.013, 0.027, and 0.036 kg/s, convex oval-trench dimple absorbers with relative roughness heights, e/D=0.2 and e/D=0.4, as well as a flat plate absorber, were evaluated for back-pass and front-pass applications. The oval-trench dimpled absorber plates in the back-pass and front-pass achieved the maximum energy efficiency of 37.5% and 50.6%, respectively, with e/D=0.4 and 0.036 kg/s. The increase in the number of Nu in e/D=0.4 was 26% and 31% more than that of the flat plate for the examined parameter ranges of back-pass and front-pass, respectively. (e/D=0.4)/(flat plate) and (e/D=0.4)/(e/D=0.2) increased by an average of 28% and 24% in back-pass for (Nuotd /Nu0)/(fotd /f0), respectively. In front-pass, (e/D=0.4)/(flat plate) and (e/D=0.4)/(e/D=0.2) improved by 35% and 25%, respectively. The collector with a relative roughness height of 0.4 has the optimal structure for this examination of collectors with an oval-trench dimple. The results indicated that collectors with convex oval-trench dimples outperform flat plates in terms of surface area expansion and turbulence generation, which boosts thermal efficiency substantially. In addition, when the experiment results were compared, the front-pass implementation outperformed the back-pass approach. As a result, thermal systems may benefit from utilizing the convex oval-trench dimple. Graphical Abstract: [Figure not available: see fulltext.]. © 2023, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature
The Keel Row
No full textConcerning a woman\u27s love, who wears a blue bonnet and a dimple in his chinhttps://egrove.olemiss.edu/kgbsides_uk/1532/thumbnail.jp
Open-Access Scheduling
No full textabstract: Declaration of Conflicts: This project has no conflicts of interest to declare.
Context: This project was completed at a federally qualified primary healthcare clinic in Phoenix, Arizona that served patients of all age groups, but primarily cared for the Hispanic population providing primary care, preventative services, family planning, two lab technicians, one promoter, two medical assistant supervisors, five front desk staff, one chief administrative officer, one chief financial officer, two medical directoers who were also providers at the clinic.
Problem and Analysis Assessment: During my clinical rotations, I saw the burden a missed patient appointment had not only on the patients themselves, but also on the clinic, providers, and the staff. It caused delay in treatment for patients, and it did not allow other patients that wanted to be seen to be seen. It also increased unnecessary costs and wasted provider time. Thereafter, I met with some of the leadership team and one of the medical directors to determine a solution to reduce the number of missed appointments that were occurring. An educational session was kept to discuss the findings of this problem to the providers and the staff and when surveys were handed out to the patients, providers, and staff to assess their satisfaction with the old scheduling system versus the new scheduling system, they were also provided with a cover letter discussing the project.
Intervention: In order for improvements in care to occur, a system process change including the way patients are scheduled must occur. In this case, an open-access scheduling system (OAS) was implemented. OAS allows a patient to schedule an appointment on the 'same-day' or the 'next-day' to be seen. One provider at each of the clinics, each day of the week was available for 'same-day' appointments from 1300-1600. The providers were still available for scheduled appointments using the previous scheduling method. Walk-ins were still accepted, and were scheduled based on patient provider preference; however, if an appointment was not available for their preferred provider, they were typically seen with the provider that was the 'same-day' provider for that day.
Strategy for change: Since patients were only allowed to schedule appointments one month in advance, only one month was needed to implement this process change. A recommendation for the future would be to clearly identify the patient encounter type, and label it as a same-day appointment, as this would be helpful when gathering and extracting data for this type of patient group specifically.
Measurement of Improvement: Over a three-month period, a data collection plan was used to determine the number of Mas over a three-month period before and after implementation of this change. Satisfaction scores were measured using likert scales for patients, provider, and staff, and a dichotomous scale was used to determine the likelihood of emergency room or urgent care use. A comparison was done to measure revenue during the same time frame. During the three months, a clinically significant decrease in MAs was seen (68% of all patients, providers and staff reported feeling either very satisfied or extremely satisfied with the new scheduling system. Additionally, patients also reported that they were less likely to visit an emergency room(88%) or urgent care (90%) since they were able to be seen the same-day or the next-day by a provider.
Effects of changes: An incidental finding occurred during this study - where 877 more patients were seen in the three months during the implementation of this project, compared to the three months prior; which likely resulted in a 41% increase in revenue. Additionally this project, allowed patients that wanted to be seen on the same day, to be seen, and it decreased unnecessary costs associated with emergency room or urgent care visits. Some of the limitations involved included the current political environment, appointment slots that were previously 15 minutes in length (in 2016), increased to 20 minutes in length (in 2017), a language barrier was noted for the patient surveys since English was not the first language for many of the patients who completed the survey (although documents were translated), and the surveys used were not reliable instrument given that a reliable instrument in previous studies could not be found.
Lessons learnt: In order to have accuracy of the survey results, it is best for the author of the study to hand out and provide scripture for the survey so that complete data is received from the surveyors.
Messages for others: Begin by making a small process change where only one provider allows for the open-access scheduling so that the entire office is not affected by it, and if results begin to look promising then it can be expanded. Additionally, correct labeling of patients as 'same-day' is also important so that additional data can be gathered when needed regarding the 'same-day' patients.
Patient/Family/Guardian Involvement: Patients who benefited from the new scheduling system (open-access scheduling) were asked to fill out a survey that asked them to disclose some demographic data and asked them to determine their satisfaction with the new vs old scheduling system and their likelihood of visiting an emergency room or urgent care.
Ethics Approval: Arizona State University Institutional Review Board (IRB) Received: September 201
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