This paper introduces a novel system designed for the separation and trapping of micro-magnetic particles in a microfluidic setup. The system employs two triangular-shaped current-carrying plates ...with different electrical currents beneath the microchannel to create a non-uniform magnetic field. This magnetic field efficiently separates and traps the magnetic particles, guiding them along distinct paths within the channel. The study includes a parametric analysis involving electrical current, particle size, magnetic susceptibility of particles, and carrier fluid, in order to identify optimal parameters for achieving maximum efficiency. Specifically, M-450 and Oligo(dT)25 magnetic particles are collected using current-carrying plates with electric currents of 50mA and 150mA, respectively. Moreover, the system's efficiency is further boosted by setting the fluid velocity to 2μm/s, leading to 99% efficiency in collecting and separating different types of particles. The proposed microchip demonstrates its versatility by enabling the trapping and separation of various particles, with the flexibility to adjust the electrical current value accordingly.
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•A novel system designed for the separation and trapping of micro-magnetic particles in a microfluidic setup.•Distinct electrical currents in triangular plates under a microchannel aid in separating various magnetic particles.•Parameter studies are investigated to identify optimal parameters for achieving maximum efficiency.•The numerical finite element solution is validated by available analytical data.
Adolescence is an important part of the human life course as it is the period of transition between childhood and adulthood. This transition is naturally accompanied with significant changes, both ...physically and psychologically. However, the quality of these physical and mental developments can be strongly affected by several parameters such as the environmental conditions and childhood experiences.
A semi-experimental method comprising of a pre- and post-test along with a control group was used for this research. To perform this research, 60 female students (13±1-years-old) from the secondary schools of the city of Karaj were asked to participate in experimental and control groups. Before and after the period of 8weeks of exercises, they filled in the self-concept and the locus of control (internal-external control) questionnaires.
The results revealed that 8weeks of aerobic exercises improved the global self-concept of all the members (P≤0.05). However, the amount of improvement was found to be spectacular in the case of moral and temperamental self-concept (P≤0.05), whereas for the social, educational and rational self-concept and the development results, though remarkably high, weren’t so spectacular (P>0.05). It was found that for the latter ones, the degree of success strongly depended on various external parameters. Moreover, 8weeks of aerobic exercise had also affected the locus of control of the participants significantly (P≤0.05). Finally, there was found to be a significant relationship between self-concept and locus of control of the participants.
It was concluded that 8weeks aerobic exercise have positive effects on the self-concept and locus of control of adolescent female students.
Aims: The Neuro-linguistic Programming approach (NLP) refers to a distinct connection between neurological and linguistic procedures and behavioral patterns learned through planning. The aim of this ...study was to investigate the effect of training neuro-linguistic programming strategies on self-efficiency, sport self-confidence, and performance of athletes with disabilities and veterans. Materials and Methods: In this semi-experimental study with pre-test post-test design with control group, 30 veterans and physically-injured athletes, who were members of 2 sitting volleyball teams (Gostaresh-e-Foolade Tabriz and Shahrdarye Tabriz) were selected by purposeful sampling method and divided in experimental (15 people) and control (15 people) groups. The instruments used in this study included general self-efficiency scale, sport confidence questionnaire, and Smith and Hanford functional test. All participants trained special skills during 24 sessions over 2 months. The experimental group, besides specific volleyball exercises, completed 18 sessions (each session took 30 minutes), practicing neuro-linguistic programming strategies. The data were analyzed by SPSS 23, using multivariate covariance analysis and dependent sample t-test. Findings: In the experimental group, sport confidence (F=33.47) and general self-efficiency (F=41.69) were significantly higher than the control group, and 65.0% and 69.5% of the changes in sport confidence and general self-efficiency were explained by NLP strategies (p<0.001) in the experimental group. Also, in the experimental group, the difference in performance was significant in the pre-test post-test based on games analysis (t=9.69) and instructorschr('39') score (t=11.04) (p<0.001). Conclusion: Training neuro-linguistic programming strategies increases self- efficiency, sport self-confidence, and performance of athletes with disabilities and veterans.
In this paper, the response of a frequency selective surface (FSS) loaded with a nonlinear element is analyzed with the help of the harmonic balance method. The linear section of this configuration ...is composed of a freestanding FSS while its nonlinear section is a p-n diode biased with
a DC voltage source. The method of moments is used to determine the impedance of the linear section at the fundamental frequency and its harmonics. The nonlinear section is modeled using the voltage-current relation of the diode. No simplifying assumption is made such that the analysis can
be used to determine the steady state response of the nonlinearly loaded FSS for both large-signal and small-signal excitation.
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Dostopno za:
BFBNIB, DOBA, GIS, IJS, IZUM, KILJ, KISLJ, NUK, PILJ, PNG, SAZU, UILJ, UKNU, UL, UM, UPUK
Aims: Cognitive abilities and mindfulness are factors hugely improving athletic activities. Blind persons, due to their lack of visual fast and accurate information, have to try to do cognitive ...executive tasks. The aim of the study was to investigate the correlation between mindfulness and cognitive abilities in the athlete blind veterans. Instrument & Methods: In the correlative descriptive-survey study, 104 female and male athlete blind veterans from West Azarbayjan and Kordestan provinces were studied in 2015. The subjects were selected via available sampling method. Data was collected by the mindfulness scale, attention and consciousness scale, and the cognitive abilities questionnaire. Data was analyzed by SPSS 22 software using Pearson correlation coefficient and linear regression analysis. Findings: Except in two components including inhibiting control and selective attention and planning, mindfulness positively and significantly correlated with cognitive abilities in other components (p<0.05). In addition, 0.438 of cognitive abilities variance in the blind persons were predicted by mindfulness (p=0.001). Conclusion: In the athlete blind veterans, mindfulness significantly correlates with some components of cognitive abilities including memory, decision-making, sustainable attention, social cognition, and cognitive flexibility. Therefore, regular mindfulness exercises can strengthen cognitive abilities in the blind veterans.
Aims: In order to reach a better functioning in the athletic contests, the athletes needs to learn completely many and different motor skills. Therefore, to select properly an offline period between ...the motor skills are very important. The aim of this study was to investigate the effects of different offline periods on the consolidation periods based on stability in the implicit motor memory in the veteran and disabled athletes. Materials & Methods: In the practical semi-experimental study, 45 veteran and disabled athletes with physical-motor disabilities, who were members of the athletic teams of Yazd Province in order to participate in the state contests and Olympiads, were studied in Yazd City in summer 2015. The subjects were selected via available sampling method. The subjects were randomly divided into three groups including 6-, 24-, and 72-hour offline period groups. The test was conducted at two stages including learning and retention using alternating serial reaction time task (ASRTT) and serial color matching task (SCMT). Data was analyzed using two-factor ANOVA with the repeated measures, one-way ANOVA, and Duncan and Bonferroni post-hoc test. Findings: In the learning stage, the main effect of the group and the interaction effect of the group and the exercise package were not significant (p>0.05). Nevertheless, the main effect of the exercise package was significant (p=0.001). In the retention stage, the main effects of the exercise package (p=0.001) and group (p=0.048) and the interaction effect between them (p=0.001) were significant. A stability based consolidation process was seen in 24-, and 72-hour offline period groups. Nevertheless, there was a retroactive interference in 6-hour offline period group. Conclusion: 24- and 72-hour offline periods affect the stability based consolidation process in the implicit motor memory in veteran and disabled athletes.
Aims: Based on the studies, there are processes in resting interval following learning, through which the trained skills are transferred into the long-term memory structures. Such a process is called ...the consolidation process. There are conflicting results following studies about the effects of different off-line periods on the consolidation process in the motor memory. The aim of this study was to investigate the effects of different off-line periods on the enhance-based consolidation process in the implicit motor memory in veteran and disabled athletes. Instrument & Methods: In the semi-experimental study, 45 male veteran and disabled athletes with physical motor disabilities were studied in Yazd in 2015.The subjects were selected via available sampling and randomly divided into three experimental groups with 6-, 24-, and 72-hour off-line periods. The test was done in two steps including learning and retention using alternating serial reaction time task (ASRTT). Data was analyzed using repeated measures two-factor ANOVA, one-way ANOVA, and Bonferroni’s post-hoc tests. Findings: In the skill learning step, the major effect of the group and the interaction effect of the group and the training package were not significant. Nevertheless, the major effect of the training package was solely significant (p=0.002). In addition, in the retention step, the major effect of the group and the interaction effect of the training package and the group were not significant. Nevertheless, the major effect of the training package was significant (p=0.001). The functioning of three groups in the retention package was better than the fifth package in the learning step. Conclusion: The off-line period and especially a 72-hour interval after the training and skill learning step can enhance the consolidation process in the implicit motor memory in the veteran and disabled athletes.
The paper deals with the tunneling effect through stacked frequency selective surfaces (FSSs). The analysis is based on a Galerkin moment method in which basis functions are entire domain. The method ...can take conductor losses into account. It is shown how the conductor loss can affect the tunneled field. Moreover, multiple reflection of the fundamental mode due to mismatches of the successive FSSs is investigated. It is shown that after considering both losses and mismatches, there is an optimum number of layers for achieving a maximum intensity of the tunneled field.
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