TEACHERS AS RESEARCHERS: THE PERCEPTIONS AND PRACTICES OF CANTHO TERTIARY EFL TEACHERS

This descriptive study aims to investigate tertiary EFL teachers’ perceptions and practices of doing research. The study was conducted with the participation of 67 EFL teachers from tertiary institutions in Cantho of Vietnam. Quantitative and qualitative data were gathered via the questionnaire and semi-structured interviews to provide insights into how Cantho tertiary EFL teachers perceive the benefits and challenges of doing research as well as their current status of practices as researchers. The study revealed that (1) Cantho tertiary teachers held positive perceptions of conducting research in the field of English language teaching, and that (2) their practices as researchers were reported to be at a high level. Understanding these is an important part of the broader process of attempting to resolve research challenges teachers are facing and thus to encourage teacher research engagement among EFL teachers. Article visualizations

Synthesis and Investigation of the Physical Properties of Lead-Free BCZT Ceramics

This work presents the structure, microstructure, and physical properties of low sintering temperature lead-free ceramics 0.52(Ba0.7Ca0.3)TiO3-0.48Ba(Zr0.2Ti0.8)O3 doped with nano-sized ZnO particles (noted as BCZT/x, x is the content of ZnO nanoparticles in wt.%, x = 0.00, 0.05, 0.10, 0.15, 0.20, and 0.25). The obtained results of Raman scattering and dielectric measurements have confirmed that Zn2+ has occupied B-site, to cause a deformation in the ABO3-type lattice of the BCZT/x specimens. The 0.15 wt.% ZnO-modified ceramic sintered at 1350°C exhibited excellent piezoelectric parameters: d33 = 420 pC/N, d31 = −174 pC/N, kp = 0.483, kt = 0.423, and k33 = 0.571. The obtained results indicate that the high-quality lead-free BCZT ceramic could be successfully synthesized at a low sintering temperature of 1350°C with an addition of appropriated amount of ZnO nanoparticles. This work also reports the influence of the sintering temperature on structure, microstructure, and piezoelectric properties of BCZT/0.15 compound. By rising sintering temperature, the piezoelectric behaviors were improved and rose up to the best parameters at a sintering temperature of 1450°C (d33 = 576 pC/N and kp = 0.55). The corresponding properties of undoped BCZT ceramics were investigated as a comparison. It also presented that the sintering behavior and piezo-parameters of doped BCZT samples are better than the undoped BCZT samples at each sintering temperature

STRUCTURE, MICROSTRUCTURE, AND PIEZOELECTRIC PROPERTIES OF KNLNS-BNKZ LEAD-FREE CERAMICS UNDER THE EFFECT OF DIFFERENT SINTERING TEMPERATURES

Samples of 0.96(K0.48Na0.48Li0.04)(Nb0.95Sb0.05)O3-0.04Bi0.5(Na0.82K0.18)0.5ZrO3 piezoelectric ceramic were fabricated with conventional ceramic techniques and sintered at different temperatures. The effect of sintering temperature (TS) on the structure, microstructure, and piezoelectric properties of the ceramics was studied in detail. The experimental results showed that with an increase of the TS temperature, the structure of the ceramics transformed from an orthorhombic-tetragonal mixed phase (O-T) at TS £ 1100 °C into a rhombohedral-tetragonal (R-T) mixed phase with a dense microstructure of uniform grain size at TS = 1110 °C. When TS was further increased (TS ³ 1120 °C), the ceramics showed only a rhombohedral phase (R). The ceramics showed the best electrical properties for TS = 1110 °C at which the rhombohedral and tetragonal (R-T) phases coexist. Specifically, the ceramic density reached its highest value (4.22 g/cm3), the electromechanical coupling coefficients kp and kt were 0.46 and 0.50, respectively, and the piezoelectric coefficient d33 was 245 pC/N.Samples of 0.96(K0.48Na0.48Li0.04)(Nb0.95Sb0.05)O3-0.04Bi0.5(Na0.82K0.18)0.5ZrO3 piezoelectric ceramic were fabricated with conventional ceramic techniques and sintered at different temperatures. The effect of sintering temperature (TS) on the structure, microstructure, and piezoelectric properties of the ceramics was studied in detail. The experimental results showed that with an increase of the TS temperature, the structure of the ceramics transformed from an orthorhombic-tetragonal mixed phase (O-T) at TS £ 1100 °C into a rhombohedral-tetragonal (R-T) mixed phase with a dense microstructure of uniform grain size at TS = 1110 °C. When TS was further increased (TS ³ 1120 °C), the ceramics showed only a rhombohedral phase (R). The ceramics showed the best electrical properties for TS = 1110 °C at which the rhombohedral and tetragonal (R-T) phases coexist. Specifically, the ceramic density reached its highest value (4.22 g/cm3), the electromechanical coupling coefficients kp and kt were 0.46 and 0.50, respectively, and the piezoelectric coefficient d33 was 245 pC/N

Critical period hypothesis on foreign language acquisition: a case of Indonesian learner of English

This essay aims to investigate and further scrutinize Lenneberg's crucial era hypothesis theory (1967). This research presents the findings of an investigation of CPH's work on foreign language acquisition rather than looking into its efforts to learn a second language. The objective is to confirm the CPH theory's application to learning a foreign language. Data were gathered using the narrative inquiry method by interviewing participants and asking them to describe their experiences learning English. This study demonstrated that the CPH theory also applies to learning a second language. The finding suggested that it is easier for young learners to obtain the target language since their brains are still flexible and sensitive. Even if there is a slight chance for a foreign language learner to acquire morphology similar to that of a native speaker, an early start in exposing children to language learning will enable them to learn the language quickly

Critical period hypothesis on foreign language acquisition: a case of Indonesian learner of English

This essay aims to investigate and further scrutinize Lenneberg's crucial era hypothesis theory (1967). This research presents the findings of an investigation of CPH's work on foreign language acquisition rather than looking into its efforts to learn a second language. The objective is to confirm the CPH theory's application to learning a foreign language. Data were gathered using the narrative inquiry method by interviewing participants and asking them to describe their experiences learning English. This study demonstrated that the CPH theory also applies to learning a second language. The finding suggested that it is easier for young learners to obtain the target language since their brains are still flexible and sensitive. Even if there is a slight chance for a foreign language learner to acquire morphology similar to that of a native speaker, an early start in exposing children to language learning will enable them to learn the language quickly

Circulating miRNAs in Pediatric Pulmonary Hypertension Show Promise as Biomarkers of Vascular Function

Background/Objectives. The objective of this study was to evaluate the utility of circulating miRNAs as biomarkers of vascular function in pediatric pulmonary hypertension. Method. Fourteen pediatric pulmonary arterial hypertension patients underwent simultaneous right heart catheterization (RHC) and blood biochemical analysis. Univariate and stepwise multivariate linear regression was used to identify and correlate measures of reactive and resistive afterload with circulating miRNA levels. Furthermore, circulating miRNA candidates that classified patients according to a 20% decrease in resistive afterload in response to oxygen (O2) or inhaled nitric oxide (iNO) were identified using receiver-operating curves. Results. Thirty-two circulating miRNAs correlated with the pulmonary vascular resistance index (PVRi), pulmonary arterial distensibility, and PVRi decrease in response to O2 and/or iNO. Multivariate models, combining the predictive capability of multiple promising miRNA candidates, revealed a good correlation with resistive (r=0.97, P2−tailed<0.0001) and reactive (r=0.86, P2−tailed<0.005) afterloads. Bland-Altman plots showed that 95% of the differences between multivariate models and RHC would fall within 0.13 (mmHg−min/L)m2 and 0.0085/mmHg for resistive and reactive afterloads, respectively. Circulating miR-663 proved to be a good classifier for vascular responsiveness to acute O2 and iNO challenges. Conclusion. This study suggests that circulating miRNAs may be biomarkers to phenotype vascular function in pediatric PAH

Sintering behavior and physical properties of Bi0.5(Na1–xKx)0.5SnO3 lead-free ceramics

In this study, Bi0.5(Na1–xKx)0.5SnO3 (BNKS) ceramics (x = 0, 0.1, 0.2, 0.3, and 0.4) were fabricated via ultrasound wave before milling. The time of ball milling decreased from 20 to 1 h. The X-ray diffraction patterns show that the BNKS has a single-phase structure. When the potassium content increases, the phase structure of the ceramics changes from rhombohedral to tetragonal. When sintered at 1100 °C and x = 0.2, the ceramics’ physical properties are the best with the mass density of 5.59 g/cm3, the electromechanical coupling constants kp of 0,31 and kt of 0.27, the remanent polarization of      11.9 µC/cm; the dielectric constant εr of 1131, and the highest dielectric constant emax of 4800

Genetic and neuronal regulation of sleep by neuropeptide VF

Sleep is an essential and phylogenetically conserved behavioral state, but it remains unclear to what extent genes identified in invertebrates also regulate vertebrate sleep. RFamide-related neuropeptides have been shown to promote invertebrate sleep, and here we report that the vertebrate hypothalamic RFamide neuropeptide VF (NPVF) regulates sleep in the zebrafish, a diurnal vertebrate. We found that NPVF signaling and npvf-expressing neurons are both necessary and sufficient to promote sleep, that mature peptides derived from the NPVF preproprotein promote sleep in a synergistic manner, and that stimulation of npvf-expressing neurons induces neuronal activity levels consistent with normal sleep. These results identify NPVF signaling and npvf-expressing neurons as a novel vertebrate sleep-promoting system and suggest that RFamide neuropeptides participate in an ancient and central aspect of sleep control

Through the Eyes of the Needles: Exploring the Lived Experiences of Filipino Fashion Designers in the State of Qatar, A Phenomenology

Background: Fashion could be dated back as to when humans had started evolving. The history of clothing began when humans had lost their fur and needed to protect themselves from the cold nights and the burning sun. Ever since clothes became in demand, the demand for quality and aesthetically pleasing clothes has never diminished. Looking around the State of Qatar, one can find numerous tailoring stores run by foreign designers or tailors, mostly Indians. The number of Filipino Fashion Designers in the country may even be less than a hundred. Different research studies regarding Filipino Fashion Designers are mostly rare as well. With much thought, the researchers have focused on the lived experiences of the Filipino Fashion Designers in the State of Qatar. Methods: This study made use of the qualitative approach focusing on phenomenology to fully understand the story of the unsung heroes of fashion designing with the central question, how Filipino fashion designers deal with challenges when it comes to providing designs. An in-depth was conducted among the participants to get what one designer has gone through in his/her day-to-day life. Findings: With the gathered data, the researchers were able to come up with three (3) main themes with three (3) sub themes; (1) Fashion Literacy: (1.1) Academics (1.2) Experience (1.3) Capabilities; (2) Stress and Mitigation: (2.1) Challenges (2.2) Adjustments (2.3) Fulfillment; (3) Fame and Association: (3.1) Collaboration (3.2) Recognition (3.3) Simulation. Recommendation: The results of this research study may be beneficial to students and other people with an interest with the topic being discussed in this paper. With the results of this phenomenology, one may continue an in depth analysis of the life of the Filipino designers, proposing new studies related to this paper.. One may also gather information that can be used in studying the life of other nationalities when it comes to fashion designing as the results may differ for other people