918 research outputs found
SISTEMA DE OPTIMIZACIÓN GRÁFICA DE TEJIDOS EN LA PRODUCCIÓN DE VESTUARIO
No full textEn todas las culturas desde el principio de los tiempos el hombre necesitó utilizar vestimentas que cubrieran su cuerpo. En términos estrictos, la vestimenta se refiere al conjunto de prendas o atuendos personales.
Ante el avance de los glaciares, el hombre tuvo que refugiarse en las cavernas naturales para poder soportar los crueles fríos que sobrevinieron. Comenzó a utilizar nuevos elementos para la confección de las ropas de abrigo que se vio forzado a vestir. Con astillas pulidas de hueso creó la aguja y cosió sus prendas, con las que llegó a cubrir enteramente su cuerpo.
El clima y el tiempo condicionaron a las primeras civilizaciones a buscar telas o materiales funcionales a sus necesidades. El vivir en continuo contacto con la naturaleza y no poseer refugio adecuado obligaron a buscar prendas y materiales óptimos.
En la evolución de la vestimenta han influido diferentes estilos y modas, materiales y tecnologías, códigos sexuales y posición social, migraciones y tradiciones.
Dependiendo de la zona geográfica y de las estaciones del año, la vestimenta de los hombres y mujeres varía. Por ejemplo en las zonas más calurosas se utiliza ropa suelta, como en los países árabes, donde podemos encontrar túnicas al igual que en los países africanos. Por otra parte en aquellos climas fríos se usan telas más gruesas y materiales que permitan conservar el calor corporal
Liquid-crystal order during synthesis affects main-chain liquid-crystal elastomer behavior
No full textThis study presents the first direct comparison of the influence of liquid-crystal order during synthesis on the thermo-mechanical behaviors of main-chain liquid-crystal elastomers (LCEs) in thiol–acrylate networks.</p
Entrepreneurship skill acquisition: Perceptions of SAED graduates on employment outcomes and business startups in Nigeria
No full textIn the past, people regarded education as a solution to overcoming poverty. Regrettably, new graduates in Nigeria still have difficulty securing jobs after graduating due to many factors, including overpopulation, poor political administration, conflicting government policies, and an education framework not tailored and adjusted to industry needs. Studies have shown that one of Nigeria's educational system shortcomings is that schools fail to prepare graduates for independent work (Odia & Omofonmwan, 2007). The study's focus was to understand the role played by the Skills Acquisition and Entrepreneurship Development (SAED) program in fostering positive experiences and employment outcomes for Nigerian graduates through the assessment of the effectiveness of the SAED program on graduate employment through post-project employment status and participants' development of other entrepreneurship skills and attributes (Almlund, Duckworth, Heckman, & Kautz, 2011; Premand et al., 2015; Propstmeier, Picot, & Schaller, 2012). Findings indicate that the SAED program positively impacts Nigerian graduates by providing alternative entrepreneurial paths, promoting awareness, and helping them start small businesses, despite not improving unemployment rates.
Keywords: Nigeria, SAED, Graduates, Employment, Entrepreneurship, Policy
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THE ROLE OF ENTREPRENEURSHIP DEVELOPMENT IN GRADUATE EMPLOYMENT OUTCOMES: A CASE STUDY OF NIGERIA’S SKILL ACQUISITION AND ENTREPRENEURSHIP DEVELOPMENT (SAED) PROGRAM
No full textThe increasing ‘youth bulge’ in Nigeria suggests that the unemployment rate among graduates of tertiary institutions will continue to rise if not appropriately addressed. To address this situation, the Nigerian government established Skills Acquisition and Entrepreneurship Development (SAED) Programmes through the National Youth Service Corps (NYSC) scheme. This qualitative case study examines the role of a SAED program in fostering employment among graduates in Lagos State, Nigeria. The study found that the SAED program is an effective and efficient way of reaching new graduates and training them in entrepreneurship skills. The program enhanced graduates’ skills for business startups and provided graduates with access to alternative career options in the absence of formal jobs. However, most of the graduate participants were unaware of the funding aspect of the program and did not have access to funding after program completion. Many indicated the need for capital to grow their businesses. Recommendations include providing more information about funding options for business startups and involving financial institutions to enhance the SAED experience. In addition, the study revealed discrimination against nursing mothers and gender stereotypes in the SAED program. This study recommends that the NYSC review its mission and vision, given the state of graduate unemployment as a national development challenge in Nigeria. Policy implications include promoting graduates’ participation irrespective of their gender and pregnancy/childbearing status, as well as transcending stereotypical gender constructs in the design and implementation of skills training and other offerings of the program.EducationDoctor of Philosophy (Ph.D.
HRTEM image (A) and SAED (B) of <i>n</i>-dodecyl sulfide stabilized Pd nanoparticles with size of 3.1±0.1 nm.
No full text<p>HRTEM image (A) and SAED (B) of <i>n</i>-dodecyl sulfide stabilized Pd nanoparticles with size of 3.1±0.1 nm.</p
Molecularly-Engineered, 4D-Printed Liquid Crystal Elastomer Actuators
No full textDue to copyright restrictions and/or publisher's policy full text access from Treasures at UT Dallas is limited to current UTD affiliates (use the provided Link to Article).Three-dimensional structures that undergo reversible shape changes in response to mild stimuli enable a wide range of smart devices, such as soft robots or implantable medical devices. Herein, a dual thiol-ene reaction scheme is used to synthesize a class of liquid crystal (LC) elastomers that can be 3D printed into complex shapes and subsequently undergo controlled shape change. Through controlling the phase transition temperature of polymerizable LC inks, morphing 3D structures with tunable actuation temperature (28 ± 2 to 105 ± 1 °C) are fabricated. Finally, multiple LC inks are 3D printed into single structures to allow for the production of untethered, thermo-responsive structures that sequentially and reversibly undergo multiple shape changes.Air Force Office of Scientific Research under award number FA9550-17-1-0328Erik Jonsson School of Engineering and Computer ScienceSchool of Natural Sciences and Mathematic
TEM (a–c), SAED (d–f) and EDX (g–i) of silver NPs synthesized exogenously by roots system of intact plants of <i>Brassica juncea</i> (a, d, g), <i>Cicer arietinum</i> (b, e, h), and <i>Phyllanthus fraternus</i> (c, f, i).
No full text<p>SAED show Bragg reflections characteristic of crystalline Ag<sup>0</sup> () and Ag<sub>2</sub>O (*).</p
Water quality and discharge of the Lower Jordan River
No full textThe fresh surface water of the Lower Jordan River (LJR) has been limited in the past several decades due to damming of its main tributaries, which reduced the annual flow by 90%, leaving a mixed flow of polluted and saline sources. A monitoring and sampling hydrometric station was installed on the southern LJR to track the temporal variations of its discharge (Q) and hydrochemistry. In addition to manual water sampling, the station includes an automatic water sampler and cellular transmitting pressure and EC sensors, allowing real time observation. All samples were analyzed for major ions (Na+, Ca2+, Mg2+, K+, Cl-, SO42-, NO3-, Br-) and several samples were analyzed for selected isotopes (S-34(sulfate), O-18(sulfate), N-15(nitrate), O-18(nitrate), H-2(water), O-18(water)) as tracers. A general inverse seasonal trend was found between EC and water level although extreme values relate to flood events during the wet period. High values of EC (up to 40.3 mS/cm), high concentration of major ions, and flood events characterized by clockwise EC-Q hysteretic relations likely relate to the dissolution of precipitated salts in the basin. Isotope analyses reveal lithology and sewage as the respective major contributors of salinity; they were used to identify events unrelated to runoff (i.e., to precipitation in the area). The continuous monitoring is an essential tool for understanding long term changes of such a dynamic system but is critical for identifying extreme events occurring rarely and rapidly, possibly having a drastic effect on fauna and flora. (C) 2015 Elsevier B.V. All rights reserved
TEM (a–d), SAED (e–h) and EDX (i–l) of silver NPs synthesized exogenously by root system of intact plants of <i>Cynodon dactylon</i> (a, e, i), <i>Portulaca grandiflora</i> (b, f, j), <i>Lycopersicon esculentum</i> (c, g, k) and <i>Vernonia cinerea</i> (d, h, l).
No full text<p>SAED show Bragg reflections characteristic of crystalline Ag<sup>0</sup> () and Ag<sub>2</sub>O (*).</p
UWB single arm spiral antenna on an EBG substrate
No full textElectromagnetic band-gap (EBG) structures exhibit unique electromagnetic properties that have led to a wide range of applications in electromagnetic devices. In this study, electromagnetic bandgap structures are utilized to enhance the bandwidth of a low-profile one-arm Archimedean spiral antenna built on a thin substrate and backed by a ground plane. It is well known that placing a ground plane (a perfect electric conductor) closely behind a spiral antenna to make the radiation unidirectional severely limits the antenna bandwidth. In order to mitigate the ground plane effect, thus, significantly increasing the bandwidth, electromagnetic bandgap structures are employed. Specifically, the one-arm spiral is placed over an EBG surface which in turn is backed by a ground plane. The EBG surface investigated for this antenna utilizes a periodic structure of rectangular patches. The EBG surface behaves as artificial magnetic conductor in the frequency band of operation. The novel antenna configuration is investigated theoretically using Ansoft Designer which uses a full-wave method of moments solver. Parametric study to understand the effect of geometrical and substrate parameters on antenna performance is carried out. It is shown that the novel antenna design with the EBG surface significantly improves the antenna bandwidth. The design details along with simulation and experimental results will be presented
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