High-directivity acoustic antenna

Acoustic antenna with unique electronic steering control is used to identify and define aerodynamic noise sources in free field, particularly in wind tunnel which is quite reverberant. Provision is made for high directivity as well as improved discrimination against unwanted background noise such as reverberation or echoes

New method for the deposition of nickel oxide in porous scaffolds for electrodes in solid oxide fuel cells and electrolyzers

A simple chemical bath deposition is used to coat a complex porous ceramic scaffold with a conformal nickel layer. The resulting composite is used as a Solid Oxide Fuel Cell electrode and its electrochemical response is measured in humidified hydrogen. X-Ray tomography is used to determine microstructural parameters of the uncoated and Ni-coated porous structure, among other, the surface area to total volume, the radial pore size and size of the necks between pores

Analytical study of acousto/optical holography-interfacing methods for acoustical and optical holography NDT research

The international status of the art of acousto optical imaging techniques adaptable to nondestructive testing and, interfacing methods for acoustical and optical holography in nondestructive testing research are studied. Evaluation of 20 different techniques encompassed investigation of varieties of detectors and detection schemes, all of which are described and summarized. Related investigation is reported in an Appendix. Important remarks on image quality, factors to be considered in designing a particular system, and conclusions and recommendations are presented. Three bibliographies are included

Estetika Wira Melayu Dalam Cerita Rakyat Hang Perkasa

Penelitian ini bertujuan untuk mengetahui Estetika Wira Melayu serta nilai-nilai yang terdapat dalam cerita rakyat Melayu Hang Perkasa karya Afrizal Cik. Cerita ini sekarang hampir tidak dikenal oleh Masyarakat Melayu Sendiri. Penelitian ini menggunakan metode kualitatif dengan studi pustaka sebagai pengambilan data utamanya dan pendekatan hermeneutik sebagai teknik analisisnya. Hasil penelitian menunjukkan bahwa cerita Hang Perkasa memiliki beberapa nilai kewiraan seperti keberanian, keteguhan hati, kemurahan hati, kekuatan jasmani dan batin, serta memiliki kharism

Poverty Amid Renewed Affluence: The Poor of New England at Mid-Decade

This article examines the problem of poverty in New England during the current period of economic prosperity. Major trends in the size and composition of the poor population within the region are analyzed. Striking changes in the relative incidence of poverty have occurred among families in New England. As the economy has moved toward full employment, poverty rates among husband-wife families in the region have fallen sharply. In contrast, female-headed families in New England have not benefited substantially from recent rapid increases in employment opportunities. The result has been a persistent trend toward the feminization of poverty in New England. The bulk of poor female family heads are of working age and could potentially be brought into the region\u27s work force. However, education and training services that can successfully attack fundamental barriers to labor force participation must be delivered to these women. Programs designed to overcome low levels of educational attainment and deficient basic skills must be combined with child care and other social services in order to further reduce overall poverty rates across the New England region

Associations between levels of physical literacy and adherence to the 24-h movement guidelines among university students:A cross-sectional study

Objectives: Emerging evidence indicates that the composition of movement behaviours within a 24-h period is associated with multiple health benefits across the lifespan. A concept that emphasises an individual's active lifestyle is physical literacy (PL), yet empirical research exploring the potential associations between PL and 24-h movement guidelines remains scarce. This study aimed to evaluate the associations between levels of PL and adherence to the guidelines among Chinese university students. Study design: A cross-sectional study. Methods: Seven hundred and ninety-eight university students (390 male, 19.2 ± 1.2 years) completed all the measurements. Levels of PL and participants’ adherence to guidelines including physical activity, sedentary behaviour and sleep were self-reported through Perceived Physical Literacy Instrument, International Physical Activity Questionnaire and Pittsburgh Sleep Quality Index, respectively. Two-way ANOVA was conducted to determine the associations between the number of guidelines met (0, 1, 2, or 3) and levels of PL. Results: The results demonstrate that 36.5% (n = 291) of the participants met all the three guidelines, while 4.1% (n = 33) met none. Further analysis indicated that meeting physical activity or sedentary behaviour guidelines was associated with significantly higher total PL scores, and scores in the sub-domains of Confidence and Physical Competence and Motivation. Conclusions: The findings provide evidence that young adults who obtained higher PL scores may meet more guidelines during a 24-h period. Future studies should incorporate accelerometer-based physical activity measurements and investigate the causal relationship between PL and adherence to the movement guidelines.</p

A room temperature low-threshold ultraviolet plasmonic nanolaser

Constrained by large ohmic and radiation losses, plasmonic nanolasers operated at visible regime are usually achieved either with a high threshold (102–104 MW cm−2) or at cryogenic temperatures (4–120 K). Particularly, the bending-back effect of surface plasmon (SP) dispersion at high energy makes the SP lasing below 450 nm more challenging. Here we demonstrate the first strong room temperature ultraviolet (~370 nm) SP polariton laser with an extremely low threshold (~3.5 MW cm−2). We find that a closed-contact planar semiconductor–insulator–metal interface greatly lessens the scattering loss, and more importantly, efficiently promotes the exciton–SP energy transfer thus furnishes adequate optical gain to compensate the loss. An excitation polarization-dependent lasing action is observed and interpreted with a microscopic energy-transfer process from excitons to SPs. Our work advances the fundamental understanding of hybrid plasmonic waveguide laser and provides a solution of realizing room temperature UV nanolasers for biological applications and information technologies.Chemistry and Chemical Biolog

Transactivation of PDGFRβ by dopamine D4 receptor does not require PDGFRβ dimerization

Growth factor-induced receptor dimerization and cross-phosphorylation are hallmarks of signal transduction via receptor tyrosine kinases (RTKs). G protein-coupled receptors (GPCRs) can activate RTKs through a process known as transactivation. The prototypical model of RTK transactivation involves ligand-mediated RTK dimerization and cross-phosphorylation. Here, we show that the platelet-derived growth factor receptor β (PDGFRβ) transactivation by the dopamine receptor D4 (DRD4) is not dependent on ligands for PDGFRβ. Furthermore, when PDGFRβ dimerization is inhibited and receptor phosphorylation is suppressed to near basal levels, the receptor maintains its ability to be transactivated and is still effective in signaling to ERK1/2. Hence, the DRD4-PDGFRβ-ERK1/2 pathway can occur independently of a PDGF-like ligand, PDGFRβ cross-phosphorylation and dimerization, which is distinct from other known forms of transactivation of RTKs by GPCRs