Students’ development of socio-scientific reasoning in a mobile augmented reality learning environment     

Hsin-Yi Chang  Ying-Shao Hsu  Hsin-Kai Wu  Chin-Chung Tsai 《International Journal of Science Education》2018,40(12):1410-1431

In this study we investigated how a newly developed learning environment that integrates mobile augmented reality (AR) technology supported students’ socio-scientific reasoning (SSR). Drawing upon the reasoned action theory, we consider the roles of students’ attitudes toward SSR before learning, and their cognitive and emotional engagement during learning in the students’ actual performance of SSR. The implementation results indicate the impact of the learning environment on students’ scientific knowledge and attitude change. Moreover, we identified a significant path of how the students developed their SSR by the interactions among their attitude toward SSR, and their cognitive and emotional engagement in the mobile AR learning environment. On the other hand, the students’ post-learning attitudes toward SSR were dominated by their pre-learning attitudes. Implications and suggestions are discussed.  相似文献   

DEVELOPMENT AND VALIDATION OF A TAIWANESE COMMUNICATION PROGRESSION IN SCIENCE EDUCATION     

Ming-Chin Hsin  Sung-pei Chien  Yin-Shao Hsu  Chen-Yung Lin  Larry D. Yore 《International Journal of Science and Mathematics Education》2016,14(1):125-148

Today, early science education is a well-accepted view. Enhancing children’s curiosity about the natural world and fostering positive attitudes toward science are primary goals of science education. However, questions remain regarding the appropriate ways to identify, nurture, and study these emotional states in pre-schoolers. This study examines the potential of using pre-schooler’s verbal (e.g. self-generated figurative expressions) and behavioral (sensorimotor interactions) responses while participating in a scientific activity, as indicators of curiosity and attitudes toward science. The responses of 41 pre-schoolers were documented via a response questionnaire developed for this study. An integrated quantitative–qualitative approach was utilized for data analyses. Results show that pre-schoolers utilize figurative expressions to express various emotional valences. Generation of verbal expressions that entail positive emotional valences and the desire to engage in sensorimotor interactions during a scientific activity were identified as positively correlated. Additionally, girls were more likely to express curiosity and positive attitudes toward science than boys in the context of this study. The findings suggest that these verbal and behavioral measures may serve as indicators of attitudes and curiosity toward science among pre-school children.  相似文献   

Finite element analysis of helical flows in human aortic arch: A novel index     

Cheng-Hung Lee  Kuo-Sheng Liu  Guan-Heng Jhong  Shih-Jung Liu  Ming-Yi Hsu  Chao-Jan Wang  Kuo-Chun Hung 《Biomicrofluidics》2014,8(2)

This study investigates the helical secondary flows in the aortic arch using finite element analysis. The relationship between helical flow and the configuration of the aorta in patients of whose three-dimensional images constructed from computed tomography scans was examined. A finite element model of the pressurized root, arch, and supra-aortic vessels was developed to simulate the pattern of helical secondary flows. Calculations indicate that most of the helical secondary flow was formed in the ascending aorta. Angle α between the zero reference point and the aortic ostium (correlation coefficient (r) = −0.851, P = 0.001), the dispersion index of the cross section of the ascending (r = 0.683, P = 0.021) and descending aorta (r = 0.732, P = 0.010), all correlated closely with the presence of helical flow (P < 0.05). Stepwise multiple linear regression analysis confirmed angel α to be independently associated with the helical flow pattern in therein (standardized coefficients = −0.721, P = 0.023). The presence of helical fluid motion based on the atherosclerotic risks of patients, including those associated with diabetes, hypertension, hyperlipidemia, or renal insufficiency, was also evaluated. Numerical simulation of the flow patterns in aortas incorporating the atherosclerotic risks may better explain the mechanism of formation of helical flows and provide insight into causative factors that underlie them.  相似文献   

Investigation of High School Students’ Online Science Information Searching Performance: The Role of Implicit and Explicit Strategies     

Meng-Jung Tsai  Chung-Yuan Hsu  Chin-Chung Tsai 《Journal of Science Education and Technology》2012,21(2):246-254

Due to a growing trend of exploring scientific knowledge on the Web, a number of studies have been conducted to highlight examination of students’ online searching strategies. The investigation of online searching generally employs methods including a survey, interview, screen-capturing, or transactional logs. The present study firstly intended to utilize a survey, the Online Information Searching Strategies Inventory (OISSI), to examine users’ searching strategies in terms of control, orientation, trial and error, problem solving, purposeful thinking, selecting main ideas, and evaluation, which is defined as implicit strategies. Second, this study conducted screen-capturing to investigate the students’ searching behaviors regarding the number of keywords, the quantity and depth of Web page exploration, and time attributes, which is defined as explicit strategies. Ultimately, this study explored the role that these two types of strategies played in predicting the students’ online science information searching outcomes. A total of 103 Grade 10 students were recruited from a high school in northern Taiwan. Through Pearson correlation and multiple regression analyses, the results showed that the students’ explicit strategies, particularly the time attributes proposed in the present study, were more successful than their implicit strategies in predicting their outcomes of searching science information. The participants who spent more time on detailed reading (explicit strategies) and had better skills of evaluating Web information (implicit strategies) tended to have superior searching performance.  相似文献   

An integrated microfluidic system for isolation, counting, and sorting of hematopoietic stem cells     

Huei-Wen Wu  Ruo-Chi Hsu  Chun-Che Lin  Shiaw-Min Hwang    Gwo-Bin Lee 《Biomicrofluidics》2010,4(2)

This study reports an integrated microfluidic system capable of isolation, counting, and sorting of hematopoietic stem cells (HSCs) from cord blood in an automatic format by utilizing a magnetic-bead-based immunoassay. Three functional modules, including cell isolation, cell counting, and cell sorting modules are integrated on a single chip by using microfluidic technology. The cell isolation module is comprised of a four-membrane-type micromixer for binding of target stem cells and magnetic beads, two pneumatic micropumps for sample transport, and an S-shaped channel for isolation of HSCs using a permanent magnet underneath. The counting and sorting of HSCs are performed by utilizing the cell counting and sorting modules. Experimental results show that a separation efficiency as high as 88% for HSCs from cord blood is achieved within 40 min for a sample volume of 100 μl. Therefore, the development of this integrated microfluidic system may be promising for various applications such as stem cell research and cell therapy.  相似文献   

Effects of compression garments on surface EMG and physiological responses during and after distance running     

Wei-Chun Hsu  Li-Wen Tseng  Fu-Chun Chen  Li-Chu Wang  Wen-Wen Yang  Yi-Jia Lin  Chiang Liu 《运动与健康科学(英文)》2020,9(6):685-691

BackgroundThe few previous studies that focused on the effects of compression garments (CG) on distance running performance have simultaneously measured electromyogram, physiological, and perceptual parameters. Therefore, this study investigated the effects of CG on muscle activation and median frequency during and after distance running, as well as blood-lactate concentration and rating of perceived exertion (RPE) during distance running.MethodsEight healthy male recreational runners were recruited to randomly perform two 40 min treadmill running trials, one with CG, and the other with control garment made of normal cloth. The RPE and the surface electromyography (EMG) of 5 lower extremity muscles including gluteus maximus (GM), rectus femoris (RF), semitendinosus (ST), tibialis anterior (TA), and gastrocnemius (GAS) were measured during the running trial. The blood-lactate levels before and after the running trial were measured.ResultsWearing CG led to significant lower muscle activation (p < 0.05) in the GM (decreased 7.40%–14.31%), RF (decreased 4.39%–4.76%), and ST (decreased 3.42%–7.20%) muscles; moreover, significant higher median frequency (p < 0.05) in the GM (increased 5.57%) and ST (increased 10.58%) muscles. Wearing CG did not alter the RPE values or the blood-lactate levels (p > 0.05).ConclusionWearing CG was associated with significantly lower muscle activation and higher median frequency in the running-related key muscles during distance running. This finding suggested that wearing CG may improve muscle function, which might enhance running performance and prevent muscle fatigue.  相似文献   

Effects of high-intensity interval training on canoeing performance     

Ming-Ta Yang  Mien-Mien Lee  Shu-Ching Hsu 《European Journal of Sport Science》2017,17(7):814-820

The purpose of this study was to compare the effects of high-intensity interval training (HIIT) and moderate-intensity continuous training (MICT) utilizing a canoeing ergometer on endurance determinants, as well as aerobic and anaerobic performances among flat-water canoeists. Fourteen well-trained male flat-water canoeists were divided into an HIIT group or an MICT group. All subjects performed a continuous graded exercise test (GXT) and three fixed-distance (200, 500, and 1000?m) performance tests on a canoeing ergometer to determine canoeing economy, peak oxygen uptake (VO₂peak), and power at VO₂peak, and to calculate the critical velocity (CV) and anaerobic work capacity before and after the training programmes. The training programme involved training on a canoeing ergometer three times per week for four weeks. HIIT consisted of seven 2 min canoeing bouts at an intensity of 90% VO₂peak separated by 1 min of rest. The MICT group was trained at an intensity of 65% VO₂peak continuously for 20 min. After four weeks of training, performance in the 200-m distance test and the power at VO₂peak significantly improved in the HIIT group; performance in the 500?m and 1000?m distances and CV significantly improved in the MICT group. However, all variables were not significantly different between groups. It is concluded that HIIT for four weeks is an effective training strategy for improvement of short-distance canoeing performance. In contrast, MICT improves middle-distance canoeing performances and aerobic capacity.  相似文献