f. yazdani

The reduction of fossil fuel usage and the simultaneous increase in the utilization of renewable fuels contribute to mitigating environmental pollution and reducing the Earth's atmospheric temperature. Today, the escalating global population poses a challenge of increased energy consumption, necessitating the adoption of simple and cost-effective methods for energy generation. Water splitting using solar light and photocatalysts for hydrogen production is one such approach. Recent years have witnessed significant advancements in the field of photocatalytic water splitting, with progress extending from fundamental scientific research to practical and scalable applications. This review begins by examining the influential factors in the design of a photocatalyst, including sacrificial agents, nanoparticle effects, solar spectrum, and the introduction of photocatalysts operating in the UV region. Subsequently, recent advancements in two-dimensional materials and heterogeneous structures for water splitting applications are summarized from a theoretical perspective. Specifically, various two-dimensional materials and heterogeneous structures employed for water splitting are discussed. Finally, the focus shifts to recent progress in the development of new materials for light absorption in the visible region, insights, and strategies in the field. The discussion concludes with an emphasis on recent advancements in the development of new materials, absorption of light in the visible region, insights, and strategies for further exploration and development.

Propylene is an important feedstock for manufacturing various products such as polypropylene, polyacrylonitrile, acrolein, acrylic acid, and so forth. Formerly, propylene was typically produced by fluid catalytic cracking and steam cracking. Due to the significant demand growth for propylene, direct production methods of propylene from the propane dehydrogenation method have been highly noticed by industries. The process of propane dehydrogenation has been commercialized by different companies and the most critical differences among different technologies are the type of reactor and their used catalyst. Platinum-based catalysts are the most widely used ones in this technology, and due to their high price in new catalyst generation, it has been attempted to use the least amount of platinum in the catalyst. Therefore, this article discussed the process of dehydrogenation of propane to propylene in general, then the platinum-based should be examined in terms of active sites, bases used, and types of promoters to increase efficiency. In conclusion, the patents related to the production of platinum-based catalysts by UOP have been collected and discussed.

The aim of this study was to produce low-calorie jelly using sour tea as a natural coloring agent, gelatin extracted from chicken skin with stevia as sweetener. Chicken skin gelatin was extracted by using alkaline-acid pre-treatment with 1 N of NaOH and 0.05 N hydrochloric acid. Gelatin was used at the concentrations of one and two percent (wt.%), Stevia with 0 to 100% replacement rates with sugar and sour tea at 20 wt.% for 100 g of jelly and 48 hours after gel production, pH measurement, Brix, moisture content, acidity, water activity, tissue stiffness, color, sensory analysis and microbial tests were performed. Experiments were conducted in a completely randomized design based on factorial experiment using SPSS software and compared with Duncan's multiple range test at 5% probability level. The results showed that by increasing gelatin concentration and the level of sucrose replacement with stevia did not have a significant effect on pH. By increasing the concentration of gelatin, texture hardness and L*, significantly increased and moisture decreased (p < 0.05), whereas the parameters of brix, water activity, a* and b* of samples were not significantly different (p> 0.05). By increasing the levels of sucrose replacement with stevia and decrease of solids content the moisture, water activity and L *, a *, b * factors were significantly increased and the brix of the samples decreased. Sensory and physicochemical properties of sour jelly samples showed that using chicken skin gelatin and stevia as sweetener could be a good alternative to low-calorie jelly formulation by preserving physical, chemical and sensory properties. Due to medicinal properties, sour tea provides beneficial contribution to sour jelly product

Due to the applications of lithium in various industries, the demand for it has increased. Seawater is a great source of lithium, but its lithium concentration is very low. Conventional separation methods are not effective in such low concentrations. Using the absorption method adopted for extracting lithium from seawater and brines with low concentration, is promising. The main problems for the practical application of lithium-ion sieve include excessive solution use, loss of adsorption pressure, difficulty in recycling powder adsorbents and poor recycling performance. Therefore, powder adsorbents have been modified for practical application by surface modification, add magnetic properties and preparing composites of them. In this review paper, different types of lithium-ion adsorbents, including types of ion sieve, crown ether, activated carbon, zeolite, and lithium aluminium layered double hydroxide chloride (Li/Al LDH) have been investigated. Various methods that improve the performance of each sorbent in practical applications have been provided.

Excessive range of adductory free moment of the ground reaction force may potentially increase the risk of lower extremity injuries by applying a higher torsional load transmitted to the proximal parts. It was hypothesized that the free moment pattern might be different between hyper-pronated and normal feet subjects. Moreover, a correlation would exist between peak adduction free moment and peak ankle-foot complex abduction at the stance phase of walking. In this cross sectional study, thirty female participants were divided into two groups of asymptomatic hyper-pronated and normal feet. Kinetic and kinematic data were collected using a single force plate and a six-camera motion analysis system during three successful free speed walking trials. Ensemble average curves were extracted from the time normalized individual trials of the stance phase for both free moment and peak ankle-foot complex abduction parameters. Significant differences in peak adductory free moment, peak ankle-foot complex eversion and peak ankle-foot complex abduction were found between normal and hyper-pronated groups (4.90±0.97 Vs. 5.94±0.88, P < 0.01), (3.30±0.95 Vs. 6.28±1.47, P < 0.01) and (4.52±1.16 Vs. 8.23±2.52, P < 0.01) respectively. A significant positive correlation was found between the peak adduction free moment and peak ankle-foot complex abduction in both groups, which was more strongly positive in hyper-pronated group (r = 0.745, p < 0.01 for normal group and r = 0.900, p < 0.01 for hyper-pronated group). As a good measure of torque which is transmitted to the lower extremity, may free moment be a useful biomechanical indicator for both clinical and research purposes.

Electromyography (EMG) signal processing and Muscle Onset Latency (MOL) are widely used in rehabilitation sciences and nerve conduction studies. The majority of existing software packages provided for estimating MOL via analyzing EMG signal are computerized, desktop based and not portable; therefore, experiments and signal analyzes using them should be completed locally. Moreover, a desktop or laptop is required to complete experiments using these packages, which costs. Develop a non-expensive and portable Android application (app) for estimating MOL via analyzing surface EMG. A multi-layer architecture model was designed for implementing the MOL estimation app. Several Android-based algorithms for analyzing a recorded EMG signal and estimating MOL was implemented. A graphical user interface (GUI) that simplifies analyzing a given EMG signal using the presented app was developed too. Evaluation results of the developed app using 10 EMG signals showed promising performance; the MOL values estimated using the presented app are statistically equal to those estimated using a commercial Windows-based surface EMG analysis software (MegaWin 3.0). For the majority of cases relative error <10%. MOL values estimated by these two systems are linearly related, the correlation coefficient value ~ 0.93. These evaluations revealed that the presented app performed as well as MegaWin 3.0 software in estimating MOL. Recent advances in smart portable devices such as mobile phones have shown the great capability of facilitating and decreasing the cost of analyzing biomedical signals, particularly in academic environments. Here, we developed an Android app for estimating MOL via analyzing the surface EMG signal. Performance is promising to use the app for teaching or research purposes.

The proliferation of the Internet, video, audio, and mobile media has made many families t to have face-to-face problems with their children. The accepted norms of families are widely questioned and denied by children and cause problems that are dysfunctional and cause a kind of disorder and imbalance in the social system, in a way that challenges the core values ​​and public security of the social system. This hurts the collective conscience and public concern of the elite. New communication media allow children to communicate outside of social and geographical boundaries. Today, computers, networks, software, and everything related to them create new pressures and issues that people must adapt to and the new arena in which they express their normal or abnormal reactions. Gaining the necessary knowledge about new communication media and learning the skills to use them can direct its educational effects. Satellite, mobile phones and the Internet are emerging phenomena affecting education that have become part of the lives of people in societies, affecting thoughts and feelings, relationships and education in general; as the characters portrayed in the media may become role models for people and influence their attitudes, beliefs and behavior. Increasing information and being different in the news is one of the advantages of modern communication media that obtains information from sources with high speed and volume and presents it to the audience. The main purpose of this research was to determine the effects of using modern media communication from Bahar city students' point of view.

The method of this research was descriptive, a kind of survey. Statistical population of the study included all female high-school students in Bahar city. Therefore, in terms of multi-cluster sampling method 288 individual were selected. The main instrument for gathering data in this research was a research-made questionnaire. For data analysis, the inferential statistics such as Kolmogorov-Smirnov test, one sample t-test and dependent t-test were used.

The results showed that students believed that using modern media communication like Internet. Mobile, and so on, have harmful and useful effects. Nevertheless, the harmful effects of them are more than their useful effects. The useful effects were: increasing the social relationship of students, promoting the individual consciousness, and facilitating second language learning. On the other hand, the harmful effects were: students’ morality disorders, isolation of students, educational drop-out, decreasing the use of local slangs, and decreasing sport activity time among students.

Considering the positive effect of using new communication media on social relations, personal awareness and facilitating second language learning, it is suggested that teachers and school officials design and use a plan for using these media in the classroom. It was also found that the harmful educational effects of modern communication media are: creating moral turmoil in students, isolating students, academic failure, reducing the use of local dialect and reducing the time of sports activities in them. Therefore, according to this finding, it is recommended that children be taught in school how to use these media correctly, as well as how to evaluate and select media content. In addition, it is suggested that the educational effects of each of the new communication media, such as mobile phones and related virtual networks, as well as satellite and the Internet, be investigated separately. It is also suggested that research be done on the correct pattern of mobile phone use and its educational opportunities and threats among students.

The aim of this study was to extract indicators of evaluating the textbooks for making a valid and reliable scale for evaluating of textbooks from teachers’ view. The research method was surveyed and statistical population of it includes all electronic and print resources in the field of curriculum that have published between the years of 2000-2015 and also all elementary teachers (3150 people) in Malayer city, between the years of 2014-15. For sampling, a biased method was used. So, 380 teachers selected. For gathering of data, the “scale of assessing the quality of textbooks” was used. This made based on the all criteria and indicators that extracted in the process of research. Results showed that the scale was valid and reliable for assessing the quality of textbooks. It cleared that the quality of elementary textbooks was good. Also, it cleared that among the six criteria, the religious criteria have regarded more than other criteria.

Nowadays, due to increase in developing of a virtual learning system, constructing of an instrument for assessing the effectiveness of them is a useful action. So, this study was carried out with the aim of presenting an approach for assessing the effectiveness of teachers’ virtual in-service training from teachers’ view. The method of research was descriptive and statistical population of it included all teachers that have passed at least one e-course from teachers’ virtual in-service training system. The total numbers of teachers were 2040 people. Therefore, the 325 subjects were participating in the study. The related data gathered through a researcher-made questionnaire was used. This instrument is an adoption from Levy’s questionnaire. For determination of validity of the questionnaire, the content and formal validity was used. So, the Lawshe’s Content Validity Ratio was applied. The Content Validity Ratio was 0.63. For proving the reliability of it, the Cronbach’s Alpha test was used. Thus, the alpha for both value and satisfaction constructs respectively was 0.92 and 0.90. The results showed that there wasn’t any significant correlation between value and satisfaction constructs. So, value & satisfaction are independent constructs. Furthermore, the results of data analysis of confirmatory factor analysis showed that the using from four components in assessing the effectiveness of teachers’ virtual in-service-training was correct. Also, this analysis showed the instrument has construct validity. Also, on the basis of factor analysis, we understand the categorizing of characteristics in four components, supporting system quality; content quality; availability; technology is accurate.