Study on the Influence of Nickel Additions on AA7020 Formability Under Superplastic Forming Like Conditions

S. Taylor,V. Janik,R. Grimes,R. Dashwood 대한금속·재료학회 2023 METALS AND MATERIALS International Vol.29 No.9

This study set out to look at the influence of nickel additions on a commercially available AA7020 to understand the impactof the resultant intermetallics on recrystallization, formability and material strength. Elevated temperature tensile testingacross a range of strain rates (5 × 10−4 s−1 × 10−1 s−1) and three temperatures (450− 500 °C) to compare material ductilityfollowed by gas bulge testing at 475 °C and two gas pressures to investigate formability in a test closer to industrial formingconditions. Material strength was established using standard tensile testing, and EBSD used to understand the microstructuralevolution of the materials. It was seen that the nickel additions increased ductility of the material across all test conditions,coupled with increasing the material strength. This was achieved due to the formation of nickel rich intermetallics whichrefine the microstructure during pre-heating through particle stimulated nucleation and subsequently improve strength throughprecipitation hardening in aging treatments.

Abnormal photoluminescence properties of GaN nanorods grown on Si(111) by molecular-beam epitaxy

Park, Young S,Kang, Tae W,Taylor, R A IOP Pub 2008 Nanotechnology Vol.19 No.47

<P>We have studied the photoluminescence properties of GaN nanorods grown on Si(111) substrates by radio-frequency plasma-assisted molecular-beam epitaxy. The hexagonal shaped nanorods with lateral average diameters from 30 to 150 nm are obtained by controlling the Ga flux with a fixed amount of nitrogen. As the diameters decrease, the main emission lines assigned as donor bound excitons are blueshifted, causing a spectral overlap of this emission line with that of the free exciton at 10 K due to the quantum size effect in the GaN nanorods. The temperature-dependent photoluminescence spectra show an abnormal behaviour with an ‘S-like’ shape for higher diameter nanorods. The activation energy of the free exciton for GaN nanorods with different diameters was also evaluated.</P>

Cutaneous Patches to Monitor Myoelectric Activity of the Gastrointestinal Tract in Postoperative Pediatric Patients

Taylor, Jordan S.,Ruijter, Vivian de,Brewster, Ryan,Navalgund, Anand,Axelrod, Lindsay,Axelrod, Steve,Dunn, James C.Y.,Wall, James K. The Korean Society of Pediatric Gastroenterology 2019 Pediatric gastroenterology, hepatology & nutrition Vol.22 No.6

Purpose: Limited means exist to assess gastrointestinal activity in pediatric patients postoperatively. Recently, myoelectric gastrointestinal activity recorded by cutaneous patches has been shown in adult patients to be predictive of clinical return of gastrointestinal function postoperatively. The aim of this case series is to demonstrate the feasibility of this system in pediatric patients and to correlate myoelectric signals with return of bowel function clinically. Methods: Pediatric patients undergoing abdominal surgery were recruited to have wireless patches placed on the abdomen within two hours postoperatively. Myoelectric data were transmitted wirelessly to a mobile device with a user-interface and forwarded to a cloud server where processing algorithms identified episodes of motor activity, quantified their parameters and nominally assigned them to specific gastrointestinal organs based on their frequencies. Results: Three patients (ages 5 months, 4 year, 16 year) were recruited for this study. Multiple patches were placed on the older subjects, while the youngest had a single patch due to space limitations. Rhythmic signals of the stomach, small intestine, and colon could be identified in all three subjects. Patients showed gradual increase in myoelectric intestinal and colonic activity leading up to the first recorded bowel movement. Conclusion: Measuring myoelectric intestinal activity continuously using a wireless patch system is feasible in a wide age range of pediatric patients. The increase in activity over time correlated well with the patients' return of bowel function. More studies are planned to determine if this technology can predict return of bowel function or differentiate between physiologic ileus and pathologic conditions.

Radiative decays of theΣ0(1385)andΛ(1520)hyperons

Taylor, S.,Mutchler, G. S.,Adams, G.,Ambrozewicz, P.,Anciant, E.,Anghinolfi, M.,Asavapibhop, B.,Asryan, G.,Audit, G.,Avakian, H.,Bagdasaryan, H.,Ball, J. P.,Barrow, S.,Batourine, V.,Battaglieri, M.,Be American Physical Society 2005 PHYSICAL REVIEW C - Vol.71 No.5

Direct Observation via In Situ Heated Stage EBSD Analysis of Recrystallization of Phosphorous Deoxidised Copper in Unstrained and Strained Conditions

S. Taylor,I. Masters,Z. Li,H. R. Kotadia 대한금속·재료학회 2020 METALS AND MATERIALS International Vol.26 No.7

Recrystallization of phosphorous deoxidised copper used for strength critical applications at elevated temperatures wasinvestigated by means of in situ heated stage EBSD analysis using a Gatan Murano heated stage mounted within a Carl ZeissSigma FEGSEM electron microscope. The influence of applied strain as the result of deformation within a Nakajima testas an analogue for industrial forming on the recrystallization temperature was investigated, the impact of increased heatingrates on microstructural evolution was also investigated. Inverse pole figure plots combined with regions of reduction in localmisorientations and variations in geometrically necessary dislocations were used to establish the point of recrystallizationand the recrystallized fraction of the material. Recrystallization was observed to occur at temperatures as low as 130 °C inhighly strained samples compared to around 300 °C within the annealed samples dependent upon heating rate. Increasedheating rates were observed to produce a finer final grain structure but had little effect on presence of <111> 60° grain twins,which was influenced more by initial material condition.

An Approach to Transit Path Design Using GIS

S.V.C. Sekhar, Wen Long Yue, M.A.P.Taylor 서울시립대학교 도시과학연구원 2004 International journal of urban sciences (IJUS) Vol. No.

The design of public transportation networks is complex and can include conflicting objectives. Networks designed to minimise travel time may not fulfil the requirement of maximum coverage and accessibility. In this context, a multi-criteria approach for transit alignment design has been developed to maximise a range of objectives using census data. Whenever a subdivision is developed in a suburban region of a medium sized city, transit operators often receive requests to link the city centre with the new locality via new routes. Traditionally, implementation of routing a new bus service is based on a ‘common sense’approach. This can lead to the development of an irrational network of public transport routes. This research offers an alternative approach, which essentially optimises ulticriteria for planning transit routes. This research has proved that it is worth considering such options for connecting origin-destination zones with a new bus service.

Social Support and Delinquent Attitudes

Taylor Carl S.,황의갑(Hwang Eui Gab),Zimmermann Carol Rapp 경찰대학 경찰학연구편집위원회 2008 경찰학연구 Vol.8 No.2

남자 청소년들이 형사사법시스템에 과도한 비율로 넘나드는 상황을 고려했을 때 어떻게 이 집단의 비행태도를 누그러뜨리고 올바른 사회성을 기르도록 할 것인가에 대한 문제는 꾸준히 고심해야 할 사항이다. 본 연구는 Cullen (1994) 이 제시한 사회후원의 청소년 비행태도에 대한 역할을 이론적 기반으로 하여 가정, 주위의 정상적인 어른들과 친구들, 그리고 불량스런 친구들로부터의 사회적 후원이 문제가 많은 도심지역에 거주하는 95명의 흑인 남자청소년들의 비행태도에 미치는 영향을 조사하였다. 경로분석의 결과에 의하면 기대했던 대로 정상적인 친구와 어른들의 사회적 후원은 비행태도를 누그러뜨리는 역할을 하고 비행집단 가입은 비행태도를 높이는 역할을 하였다. 그러나 청소년들에 대한 가정에서의 후원은 비행태도에 직접적인 영향을 주기보다는 정상적인 사회관계를 북돋우고 비행집단 가입을 저지함으로써 결국 간접적으로 비행태도를 낮추는 역할을 하였다. 데이터의 한계로 말미암아 교육과 종교 등 공식적인 형태의 사회후원 체계의 역할은 경로분석의 틀로 완벽하게 분석할 수 없었으나 상관관계라는 제한된 분석의 결과는 교회출석과 부모의 교육이수가 청소년들로 하여금 비행집단 가입 등 불법적인 형태의 사회후원과 범죄 속으로 빠져드는 것을 막는 역할을 한다는 것을 보여주었다. 이러한 분석결과를 토대로 정책대안에 대해 논하였다. Given the vast over-representation of young males in the criminal justice system, how to intervene with this group to extinguish criminal attitudes and support prosocial attitudes remains an open question. This study examines the role of social support, proposed by Cullen (1994), in the formation of conventional or delinquent attitudes - specifically, the role of social support from family, conventional adults and peers, and non-conventional peers on the delinquent attitudes of ninety-five black adolescents and young adults in an urban area of concentrated disadvantage. Path analysis showed that, as expected, social support from conventional peers and adults was associated with lower delinquent attitudes and gang membership was associated with higher levels of delinquent attitudes. However, the effect of family support was not directly associated with lower delinquent attitudes, but did indirectly affect delinquent attitudes through a positive association with prosocial support from others and through a negative relationship with gang involvement. Formal sources of social support could not be fully modeled, given the limitations of the data, but limited analysis indicated that education and religiosity might help insulate minority males from gravitating toward illegitimate sources of social support and criminality. Policy implications are discussed.

Postoperative chemoradiotherapy versus radiotherapy alone for elderly cervical cancer patients with positive margins, lymph nodes, or parametrial invasion

Taylor R. Cushman,Waqar Haque,Hari Menon,Chad G. Rusthoven,E. Brian Butler,Bin S. Teh,Vivek Verma 대한부인종양학회 2018 Journal of Gynecologic Oncology Vol.29 No.6

Objective: Women with cervical cancer (CC) found to have positive surgical margins, positive lymph nodes, and/or parametrial invasion receive a survival benefit from postoperative chemoradiotherapy (CRT) vs. radiation therapy (RT) alone. However, older women may not benefit to the same extent, as they are at increased risk of death from non-oncologic causes as well as toxicities from oncologic treatments. This study sought to evaluate whether there was a survival benefit of CRT over RT in elderly patients with cervical cancer. Methods: The National Cancer Database was queried for patients ≥70 years old with newly diagnosed IA2, IB, or IIA CC and positive margins, parametrial invasion, and/or positive nodes on surgical resection. Statistics included logistic regression, Kaplan-Meier overall survival (OS), and Cox proportional hazards modeling analyses. Results: Altogether, 166 patients met inclusion criteria; 62 (37%) underwent postoperative RT and 104 (63%) underwent postoperative CRT. Younger patients and those living in areas of higher income were less likely to receive CRT, while parametrial invasion and nodal involvement were associated with an increased likelihood (p<0.05 for all). There were no OS differences by treatment type. Subgroup analysis by number of risk factors, as well as each of the 3 risk factors separately, also did not reveal any OS differences between cohorts. Conclusion: In the largest such study to date, older women with postoperative risk factor(s) receiving RT alone experienced similar survival as those undergoing CRT. Although causation is not implied, careful patient selection is paramount to balance treatment-related toxicity risks with theoretical outcome benefits.

Nitric Oxie Down-regulates Hepatocyte- Inducible Nitric Oxide Synthase Gene Expression

Taylor, Bradley S.,Kim, Young-Myeong,Wang, Qi,Shapiro, Richard A.,Billiar, Timothy R.,Geller, David A. MediMedia Korea 1998 JAMA-Korea Vol.13 No.1

Social Support and Delinquent Attitudes : Testing the Effects of Illegitimate versus Legitimate Sources of Social Support on the Delinquent Attitudes of Inner-City Black Male Juveniles

Taylor, Carl S.;Hwang, Eui Gab;Zimmermann, Carol Rapp 경찰대학교 2008 경찰학연구 Vol.8 No.2

남자 청소년들이 형사사법시스템에 과도한 비율로 넘나드는 상황을 고려했을 때 어떻게 이 집단의 비행태도를 누그러뜨리고 올바른 사회성을 기르도록 할 것인가에 대한 문제는 꾸준히 고심해야 할 사항이다. 본 연구는 Cullen (1994) 이 제시한 사회후원의 청소년 비행태도에 대한 역할을 이론적 기반으로 하여 가정, 주위의 정상적인 어른들과 친구들, 그리고 불량스런 친구들로부터의 사회적 후원이 문제가 많은 도심지역에 거주하는 95명의 흑인 남자청소년들의 비행태도에 미치는 영향을 조사하였다 경로분석의 결과에 의하면 기대했던 대로 정상적인 친구와 어른들의 사회적 후원은 비행태도를 누그러뜨리는 역할을 하고 비행집단 가입은 비행태도를 높이는 역할을 하였다. 그러나 청소년들에 대한 가정에서의 후원은 비행태도에 직접적인 영향을 주기보다는 정상적인 사회관계를 북돋우고 비행집단 가입을 저지함으로써 결국 간접적으로 비행태도를 낮추는 역할을 하였다. 데이터의 한계로 말미암아 교육과 종교 등 공식적인 형태의 사회후원 체계의 역할은 경로분석의 틀로 완벽하게 분석할 수 없었으나 상관관계라는 제한된 분석의 철과는 교회출석과 부모의 교육이수가 청소년들로 하여금 비행집단 가입 등 불법적인 형태의 사회후원과 범죄 속으로 빠져드는 것을 막는 역할을 한다는 것을 보여 주었다. 이러한 분석결과를 토대로 정책대안에 대해 논하였다 Given the vast over-representation of young males in the criminal justice system, how to intervene with this group to extinguish criminal attitudes and support prosocial attitudes remains an open question. This study examines the role of social support, proposed by Cullen (1994), in the formation of conventional or delinquent attitudes - specifically, the role of social support from family, conventional adults and peers, and non-conventional peers on the delinquent attitudes of ninety-five black adolescents and young adults in an urban area of concentrated disadvantage. Path analysis showed that, as expected, social support from conventional peers and adults was associated with lower delinquent attitudes and gang membership was associated with higher levels of delinquent attitudes. However, the effect of family support was not directly associated with lower delinquent attitudes, but did indirectly affect delinquent attitudes through a positive association with prosocial support from others and through a negative relationship with gang involvement. Formal sources of social support could not be fully modeled, given the limitations of the data, but limited analysis indicated that education and religiosity might help insulate minority males from gravitating toward illegitimate sources of social support and criminality. Policy implications are discussed.