Efecto del enrollado y enderezado en las propiedades mecánicas de barras de acero de diámetro medio y grande fabricadas en rollo

Reinforcing bars produced in coils offer important logistic and environmental advantages, for this reason there is a tendency to produce them in medium and larger diameters. Fabrication introduces complex load and temperature histories producing residual stresses. This paper presents an experimental and theoretical study of the incidence in the mechanical properties of reinforcing bars manufactured in coils, mainly in terms of ductility. Experimentation included phases of characterization of the core and crown regions of the bar, and comparison of straight bars and identical rolled bars straightened in laboratory conditions. Numerical study is based in a mixed-hardening constitutive model and allows considering the actual geometry of the bar as well as the high temperatures involved. The model identifies the origin and distribution of residual stresses and the main effects in the mechanical properties of the bars. Finally, recommendations are given regarding coil radius in order to control bar ductility.Las armaduras en rollo ofrecen grandes ventajas logísticas y medioambientales, por lo que tienden a fabricarse en diámetros medios y grandes. La fabricación introduce complejas historias de carga y temperatura produciendo tensiones residuales. En este artículo se presenta un estudio experimental y numérico sobre la incidencia en las propiedades mecánicas de las barras en rollo, principalmente en la ductilidad. La experimentación incluye fases de caracterización de las zonas del núcleo y corona de la barra, y la comparación entre barras rectas y barras enrolladas idénticas enderezadas en condiciones de laboratorio. El estudio numérico se basa en un modelo constitutivo de endurecimiento mixto y permite considerar la geometría real de la barra y las altas temperaturas involucradas. Se identifican los orígenes y distribuciones de las tensiones residuales y los principales efectos que se producen en las propiedades mecánicas. Finalmente, se recomiendan radios de rollos para controlar la pérdida de ductilidad

A scoping review and thematic analysis of social and behavioural research among HIV-serodiscordant couples in high-income settings.

CAPRISA, 2015.Abstract available in pdf

The Wisdom of Retaining Experienced Nurses at the Bedside: A Pilot Study Examining a Minimal Lift Program and Its Impact on Reducing Patient Movement Related Injuries of Bedside Nurses

This Robert Wood Johnson Inundation grant-funded research examined nursing satisfaction with devices used in the target hospital\u27s minimal lift program. It also investigated the possibility of maintaining or increasing retention of experienced nurses at the bedside by reducing potential patient movement-related injuries

Social Service Needs and Case Management Implications for Individuals Accessing a Faith-Based Suburban Homeless Shelter

The purpose of this study was to identify social service needs and case management implications for homeless and marginally housed individuals accessing services at a suburban faith-based agency. The overall goal for the study was to provide data from the perspectives and experiences of clients that could be used to develop and/or revise services to more fully facilitate clients\u27 movement toward self-sufficiency. The study used an exploratory qualitative design. Study participants consisted of 38 men and women currently using agency services who participated in one of four focus group sessions. Thematic analysis of the content of the audiotapes of the group sessions revealed that the overarching issue for participants was the ability to obtain and maintain employment. Related to this issue were six themes: job readiness and support; self-esteem issues; substance use and treatment; communications; women\u27s issues; and transportation. Based on these client-generated themes, a multi-level case management program is presented

Ranking Journals Following a Matching Model Approach: An Application to Public Economics Journals

Journal rankings based on citation indexes are widely used in the economics field. This paper proposes an alternative way to rank journals based on the publishing behavior of top-ranked authors. I justify this approach by depicting the scientific publishing market as following a matching process. Compared with the citation approach, the methodology that we propose has advantages in terms of time effort to produce national and subdiscipline rankings. It also corrects the impact underestimation that the citation approach tends to produce in new and re-founded journals. This paper proposes an empirical application to the case of public economics journals. Copyright 2008 Blackwell Publishing, Inc..

Efecto del enrollado y enderezado en las propiedades mecánicas de barras de acero de diámetro medio y grande fabricadas en rollo

Reinforcing bars produced in coils offer important logistic and environmental advantages, for this reason there is a tendency to produce them in medium and larger diameters. Fabrication introduces complex load and temperature histories producing residual stresses. This paper presents an experimental and theoretical study of the incidence in the mechanical properties of reinforcing bars manufactured in coils, mainly in terms of ductility. Experimentation included phases of characterization of the core and crown regions of the bar, and comparison of straight bars and identical rolled bars straightened in laboratory conditions. Numerical study is based in a mixed-hardening constitutive model and allows considering the actual geometry of the bar as well as the high temperatures involved. The model identifies the origin and distribution of residual stresses and the main effects in the mechanical properties of the bars. Finally, recommendations are given regarding coil radius in order to control bar ductility.Las armaduras en rollo ofrecen grandes ventajas logísticas y medioambientales, por lo que tienden a fabricarse en diámetros medios y grandes. La fabricación introduce complejas historias de carga y temperatura produciendo tensiones residuales. En este artículo se presenta un estudio experimental y numérico sobre la incidencia en las propiedades mecánicas de las barras en rollo, principalmente en la ductilidad. La experimentación incluye fases de caracterización de las zonas del núcleo y corona de la barra, y la comparación entre barras rectas y barras enrolladas idénticas enderezadas en condiciones de laboratorio. El estudio numérico se basa en un modelo constitutivo de endurecimiento mixto y permite considerar la geometría real de la barra y las altas temperaturas involucradas. Se identifican los orígenes y distribuciones de las tensiones residuales y los principales efectos que se producen en las propiedades mecánicas. Finalmente, se recomiendan radios de rollos para controlar la pérdida de ductilidad

Measuring and examining innovation in Philippine business and industry

Innovation involves implementing new or significantly improved goods and services, production processes, marketing, or organizational methods for adding value. The measurement of innovation provides a mechanism for benchmarking national performance, and for examining innovation and its relation to economic growth. Further, examining determinants and bottlenecks to innovation among firms provides inputs to mainstreaming of policies on innovation. This paper describes and discusses the results of the 2015 Survey of Innovation Activities, conducted by the Philippine Institute for Development Studies. Survey results suggest that less than half of the firms in the country are innovators, with larger-sized firms innovating more than micro, small, and medium establishments. Government needs to have a champion for developing stronger policies and interventions to support and encourage innovation. It is also important to improve information dissemination on public programs available to assist firms in innovating. Networking, linkages, and collaboration among the government, industry associations, and universities and research institutions also require further enhancement