Review:Mycorrhizoremediation—an enhanced form of phytoremediation     

KHAN Abdul G. 《Journal of Zhejiang University. Science. B》2006,(7)

INTRODUCTION Biosphere pollution by heavy metals and nu-cleotides was accelerated dramatically during the last few decades due to mining, smelting, manufacturing, treatment of agricultural soils with agro-chemicals and soil sludge, etc. Problems associated with the contamination of soil and water such as animal wel-fare, health, fatalities and disruptions of natural eco-systems are well documented (He et al., 2005). Heavy metals such as Pb, Cr, As, Cu, Cd, and Hg, being added to our so…  相似文献   

Paulo Freire’s critical and dialogic pedagogy and its implications for the Bahraini educational context     

Nina Abdul Razzak 《Educational Philosophy and Theory》2020,52(9):999-1010

Abstract

This paper is a conceptual analysis in methodology. The purpose it fulfils is that of analysing the critical and dialogic pedagogy of Paulo Freire, to arrive at implications of Freire’s philosophy and approach for the current educational context of the Kingdom of Bahrain. The Bahraini context is currently one of major economic, social, and educational reforms. Despite several reform initiatives, however, schools in Bahrain are still not advancing as they should be and deficiencies continue to exist in students’ development of higher-order thinking skills, such as critical thinking, problem-solving, and analysis. Among the implications made by this study are ones related to: teaching and learning practices within a classroom, cultivation of 21st Century skills, curriculum development and planning, and the role played by the teacher. The paper ends with a number of significant recommendations for teachers and policy-makers, which can enhance education in Bahrain and help it progress faster. These recommendations can also prove to be useful to other parallel contexts regionally and internationally.  相似文献   

A comparative study of conventional and supercritical fluid extraction methods for the recovery of secondary metabolites from <Emphasis Type="Italic">Syzygium campanulatum</Emphasis> Korth     

Abdul Hakeem Memon  Mohammad Shahrul Ridzuan Hamil  Madeeha Laghari  Fahim Rithwan  Salman Zhari  Mohammed Ali Ahmed Saeed  Zhari Ismail  Amin Malik Shah Abdul Majid 《Journal of Zhejiang University. Science. B》2016,17(9):683-691

Syzygium campanulatum Korth is a plant, which is a rich source of secondary metabolites (especially flavanones, chalcone, and triterpenoids). In our present study, three conventional solvent extraction (CSE) techniques and supercritical fluid extraction (SFE) techniques were performed to achieve a maximum recovery of two flavanones, chalcone, and two triterpenoids from S. campanulatum leaves. Furthermore, a Box-Behnken design was constructed for the SFE technique using pressure, temperature, and particle size as independent variables, and yields of crude extract, individual and total secondary metabolites as the dependent variables. In the CSE procedure, twenty extracts were produced using ten different solvents and three techniques (maceration, soxhletion, and reflux). An enriched extract of five secondary metabolites was collected using n-hexane:methanol (1:1) soxhletion. Using food-grade ethanol as a modifier, the SFE methods produced a higher recovery (25.5%?84.9%) of selected secondary metabolites as compared to the CSE techniques (0.92%?66.00%).  相似文献   

Head Teachers' Perspectives on School Drop-Out in Secondary Schools in Rural Punjab,Pakistan     

Abdul Waheed Mughal  Jo Aldridge 《Educational Studies A Journal of the American Educational Studies Association》2017,53(4):359-376

This study investigates head teachers' perspectives of the school dropout problem at public secondary schools in rural Punjab, Pakistan. The study is based on qualitative methods and included interviews to collect primary data. Sixteen districts of the Punjab where secondary school dropout rate is above 20% were purposively selected for the study. The findings indicate that—other than some socioeconomic and individual factors—different exam patterns at primary, elementary, and secondary levels; easy promotion policy in early classes; English medium syllabus; substandard educational background of students; high failure rate in class 9; and top-down pressures on teachers to perform nonacademic duties are major causes of children dropping out from school. The findings of the study suggest that only through implementation of a socio-culturally compatible syllabus—a corresponding examination system for all levels—allowing students to repeat class 9 in case they fail, setting teachers free from nonteaching duties and providing extra financial support to economically underprivileged students can significantly prevent school dropout at secondary level. The study further argues that easy promotion policy in early classes may retain more children at school but it causes high rates of dropout from secondary classes.  相似文献   

Student attrition and academic and social integration: Application of Tinto’s model at the University of Papua New Guinea   总被引：1，自引：0，他引：1  

Md. Abdul Mannan 《Higher Education》2007,53(2):147-165

This study explores the compensatory relationship between academic and social integration, and also assesses the differences of group specific academic and social integration in a small university in the Pacific as perceived by the students. In order to reduce attrition through developing a relevant retention policy, a comprehensive group specific assessment of academic and social integration was necessary. Using the Tinto model and research instruments, an institutional academic and social integration assessment instrument was developed for measuring perceived integration climate for specific subject and year of studies groups. An important outcome of this study was the existence of a compensatory relationship between academic and social integration. Differences were found between perceived ratings of student groups for both academic and social integration.  相似文献   

Development and validation of a questionnaire for teacher effective communication in Qur’an learning     

Yusuf Hanafi  Nurul Murtadho  Abd Rauf Hassan  M. Alifudin Ikhsan  Tsania Nur Diyana 《British Journal of Religious Education》2020,42(4):424-434

ABSTRACT

A student’s perception of teacher effective communication influences the learning atmosphere. The measurement of perception indicates how students view the quality of learning. As few studies have explored the development of an appropriate measurement tool of students’ perception of learning to read the Qur’an, this study aims to develop such a tool. Conceptual analysis and a survey using open-ended questions resulted in dimensions and items. Six experts and three instructors evaluated the content validity. The questionnaire was then administered to 421 participants – 201 for Exploratory Factor Analysis (EFA) and 220 for Confirmatory Factor Analysis (CFA). The results successfully identified four dimensions that explained 64.6% of the variation. The instrument consisted of 13 items with satisfactory reliability and validity. The dimension with the highest coefficient path was ‘understanding and friendliness’ (UF), while the dimension of ‘learning media’ (LM) was the lowest. There was a significant influence of gender on the dimension of UF, as well as verbal (V) and non-verbal (NV) communication, while there were no differences in the dimension of LM. The questionnaire can be effectively used as a measurement device of dimensions related to students’ perception of teacher effective communication in Qur’an learning.  相似文献   

Medieval Islamic Medicine     

Abdul Nasser Kaadan 《Al-Masaq: Islam & the Medieval Mediterranean》2011,23(2):147-149

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Neural network and principal component regression in non-destructive soluble solids content assessment: a comparison     

Kim-seng Chia  Herlina Abdul Rahim  Ruzairi Abdul Rahim 《Journal of Zhejiang University. Science. B》2012,13(2):145-151

Visible and near infrared spectroscopy is a non-destructive, green, and rapid technology that can be utilized to estimate the components of interest without conditioning it, as compared with classical analytical methods. The objective of this paper is to compare the performance of artificial neural network (ANN) (a nonlinear model) and principal component regression (PCR) (a linear model) based on visible and shortwave near infrared (VIS-SWNIR) (400–1000 nm) spectra in the non-destructive soluble solids content measurement of an apple. First, we used multiplicative scattering correction to pre-process the spectral data. Second, PCR was applied to estimate the optimal number of input variables. Third, the input variables with an optimal amount were used as the inputs of both multiple linear regression and ANN models. The initial weights and the number of hidden neurons were adjusted to optimize the performance of ANN. Findings suggest that the predictive performance of ANN with two hidden neurons outperforms that of PCR.  相似文献   

Tribological evaluation of refined, bleached and deodorized palm stearin using four-ball tribotester with different normal loads     

Chiong Ing Tiong  Yahya Azli  Mohammed Rafiq Abdul Kadir  Samion Syahrullail 《浙江大学学报(A卷英文版)》2012,13(8):633-640

The effects of the mechanical factors with applied loads on the tribological performance of refined, bleached and deodorised (RBD) palm stearin (PS) were studied using a four-ball tribotester. All the RBD PS results were simultaneously compared with the additive-free paraffinic mineral oil (PMO). The experiments were carried out using different loads with a constant speed in order to gain a better understanding of the mechanical processes that occurred during the experiment. For each experiment, the temperature was increased to 75 °C and was run for 1 h. In a mechanical system, lubricant plays an important role in reducing wear and friction. PS exists as a semi-solid at room temperature after the fractionation process from oil palm. Due to the increasing rate of pollution to the environment, vegetable oil was chosen as the test lubricant with regard to its biodegradability. Other advantages of vegetable oil are that it is more easily harvestable and non-toxic compared to petroleum-based oil, which made it a suitable candidate. From the experiment, RBD PS is found to have a better friction constraint reduction compared with additive-free PMO.  相似文献   

Somatic embryogenesis in wild relatives of cotton （Gossypium Spp.）   总被引：2，自引：0，他引：2  

Rao AQ  Hussain SS  Shahzad MS  Bokhari SY  Raza MH  Rakha A  Majeed A  Shahid AA  Saleem Z  Husnain T  Riazuddin S 《Journal of Zhejiang University. Science. B》2006,7(4):291-298

Wild cotton species can contribute a valuable gene pool for agronomically desirable cultivated tetraploid cultivars. In order to exploit diploid cotton a regeneration system is required to achieve transformation based goals. The present studies aimed at optimizing the conditions for regeneration of local varieties as well as wild species of cotton. Different callus induction media were tested with varying concentrations of hormones in which sucrose was used as nutritional source. Different explants （hypocotyls, cotyledon, root） were used to check the regeneration of both local cotton plants and wild relatives using T ＆ G medium, BAP medium, CIM medium, EMMS medium, and cell suspension medium. Different stages of embryogenicity such as early torpedo stage, late torpedo stage, heart stage, globular stage and cotyledonary stage were observed in wild relatives of cotton. The results of this study pave the way for establishing future transformation methods.  相似文献