Notch effects in tensile behavior of AM60 magnesium alloys

The deformation and failure behavior of an AM60 magnesium alloy was investigated using tensile test on circumferentially notched specimens with different notch radii. The strain and stress triaxiality corresponding to the failure point were evaluated using both analytical and finite element analyses. Combining with systematical observations of the fracture surfaces, it is concluded that deformation and failure of AM60 magnesium alloy are notch (constraint) sensitive. The failure mechanisms change from ductile tearing to quasi cleavage with the increase of constraint

Micro heat exchanger by using MEMS impinging jets

A micro impinging-jet heat exchanger is presented here. Heat transfer is studied for single jet, slot arrays and jet arrays. In order to facilitate micro heat transfer measurements with these devices, a MEMS sensor chip, which has an 8 x 8 temperature-sensor array on one side, and an integrated heater on the other side has been designed and fabricated. This sensor chip allows 2-D surface temperature measurement with various jets impinging on it. It is found that micro impinging jets can be highly efficient when compared to existing macro impinging-jet microelectronics packages such as IBM 4381. For example, using a single nozzle jet (500-μm diameter driven by 5 psig pressure), the sensor chip (2 x 2 cm^2) temperature can be cooled down from 70 to 33°C. The cooling becomes more efficient when nozzle arrays (4x5 over 1 cm^2 area) are used under the same driving pressure. Interestingly, although higher driving pressure gives better cooling (lower surface temperature), the cooling efficiency, defined as h/0.5pv^2, is actually higher for lower driving pressure

Fungsi Kode dalam Program Acara “Beleter” Tvri Kalbar

Penelitian ini bertujuan untuk mendeskripsikan fungsi kode serta faktor yang melatarbelakangi pemilihan kode kebahasaan dalam program acara “Beleter” TVRI Kalbar. Metode yang digunakan dalam penelitian ini yaitu metode deskriptif dan bentuk penelitian kualitatif. Teknik dalam pengumpulan data ini yaitu wawancara, studi dokumentasi atau dokumen dan teknik simak, sedangkan alat pengumpul data dalam penelitian ini terdiri dari kartu pencatat data, tape recorder, dan lembar pedoman wawancara. Teknik analisa data menggunakan model Miles dan Huberman yaitu pertama, pengumpulan data, kedua, reduksi data, ketiga, penyajian data, dan keempat, penarikan simpulan. Hasil penelitian berdasarkan Fungsi kode yang terdapat pada penelitian yaitu terdapat lima fungsi, fungsi emotif, fungsi konatif, fungsi referensial, fungsi puitik dan fungsi fatik. Faktor yang melatarbelakangi pemilihan kode kebahasaan yaitu hal yang sudah direncanakan, pembicara atau penutur, pendengar atau lawan tutur dan Perubahan situasi karena hadirnya orang ketiga

Experimental Study On Z-Pinned DCB Mode I Delamination

An experimental investigation on mode I delamination of z-pinned double-cantilever-beams (DCB) and corresponding pin pullout behaviour is presented. The effects of loading rate on delamination crack opening and z-pin bridging mechanisms is reported. Optical micrographs of z-pins after pullout show that a higher loading rate causes more splitting damage in the pins. Comparison of fracture load shows that the fracture load rises with increasing loading rate. Z-pin pullout tests were also conducted to give a detailed description of z-pin bridging mechanisms

MULTIPLE-INTELLIGENCE-BASED LEARNING INFLUENCE ON DEVELOPING CREATIVE THINKING IN SOCIAL STUDIES AMONG NINTH-GRADE STUDENTS IN ABU DHABI, UNITED ARAB EMIRATES

This study aimed to examine the influence of multiple intelligence-based learning on the development of creative thinking for ninth-grade students in Abu Dhabi private schools. This study used a quasi-experimental design. Also, this study used a control group (30 students) and an experimental group (30 students) of ninth grade students from private schools in Abu Dhabi. The two groups were selected randomly. The instruments used were pre and post-tests in creative thinking skills. Data was analysed using descriptive statistics, ANCOVA and t-test. The findings revealed a significant difference in the creative thinking post-test mean score after controlling for the effect of pre-test between both groups. The experimental group (M = 82.97, SD = 9.98) exceeded the control group (M = 61.20, SD = 15.85) after controlling the effect of the pre-test of creative thinking on both groups, F (1, 57) = 38.31, p = .000. The t-test revealed that there was a significant effect for gender in the elaboration skill (post-test), t (28) = -2.12, p = .043, with females (M = 22.50, SD = 1.95) receiving higher scores than males (M = 20.25, SD = 3.53). In conclusion, the findings reveal the influence of multiple intelligence-based learning on the students’ creative thinking skills.    Article visualizations

Mobile App Development to Increase Student Engagement and Problem Solving Skills

This paper describes a project designed to promote problem solving and critical thinking skills in a general education, computing course at an open access institution. A visual programming tool, GameSalad, was used to enable students to create educational apps for mobile platforms. The students worked on a game development project for the entire semester, incorporating various skills learned throughout the semester. Pre and post quiz analysis showed a significant improvement in students’ ability to design comprehensive solutions to a given problem. Survey results also showed increased student engagement, high interest in computing and a “better” understanding of information technology

An animal's sex influences the effects of the excipient PEG 400 on the intestinal P-gp protein and mRNA levels, which has implications for oral drug absorption

There is a growing body of evidence which suggests that formerly regarded "inert" pharmaceutical excipients have the potential to influence oral drug bioavailability. The solubilizing agent polyethylene glycol 400 (PEG 400), for instance, has a sex-specific effect on P-glycoprotein (P-gp)-mediated drug bioavailability. We hypothesized that such an effect could be via PEG-induced alteration of P-gp activity and/or expression to different extents in males and females. To test this hypothesis in vivo, we investigated the influence of orally administered PEG 400 on the protein content and mRNA expression of P-gp in different regions of the gastrointestinal tract in male and female rats. Fasted rats received an oral dose of PEG 400 and at different time intervals, rats were sacrificed and their intestines were collected. The P-gp protein and mRNA expression in different intestinal segments (duodenum, jejunum, ileum and colon) were measured by Western blotting and PCR, respectively. It was found that P-gp protein and mRNA levels increased along the gastrointestinal tract in control animals (i.e. without PEG administration), and was higher in males compared to the female rats. The oral administration of PEG 400 decreased the P-gp expression in the jejunum, ileum and colon of males but not in the corresponding segments in females. This sex-dependent influence of PEG 400 on P-gp levels reflects and explains the sex-related effect of PEG 400 on oral absorption of certain drugs. The data further adds to the growing literature on the importance of taking into consideration an individual's sex for optimal drug administration