Diagnosing Competency Mastery in Science: An Application of GDM to TIMSS 2011 Data     

Masoud Kabiri  Mahmood Ghazi-Tabatabaei  Abbas Bazargan  Mohsen Shokoohi-Yekta  Kamal Kharrazi 《教育实用测度》2017,30(1):27-38

Numerous diagnostic studies have been conducted on large-scale assessments to illustrate the students’ mastery profile in the areas of math and reading; however, for science a limited number of investigations are reported. This study investigated Iranian eighth graders’ competency mastery of science and examined the utility of the General Diagnostic Model (GDM) to produce diagnostic information using TIMSS 2011 data. Eight diagnostic attributes were extracted, using documentary analysis of the major large-scale assessment frameworks, including basic science knowledge, using models, reasoning, using science, representing data, explaining of phenomena, predicting, and scientific inquiry. These attributes were then assigned to each item in order to construct the Q matrix, through focus group discussions, survey of head science teachers, think-aloud verbal protocol, and analysis of written answers. Results show the utility of GDM to generate rich diagnostic information for a national large-scale assessment. Moreover, the findings indicated that students performed relatively well in using science, but performed weakly in reasoning, explaining of phenomena, and scientific inquiry, which all required complex skills and higher-order thinking abilities.  相似文献   

The New Office Technology and Its Effects on Secretaries and Managers   总被引：1，自引：0，他引：1  

Halimaton Khalid  Helen Swift  Cedric Cullingford 《Education and Information Technologies》2002,7(3):257-274

This article examines effects of new office technology on secretaries' attitudes in the UK and Malaysia. Despite research studies on the impact of this technology, there has been a lack of empirical evidence on secretaries working patterns, interactions and communication, and specifically how new office technology has changed working practices in the culture of offices.The sample of this research study comprised secretaries and managers in the UK and Malaysia. The main findings are these: Whilst significant historical and political changes are subtle there are shifts which stand out as important. Both managers and secretaries are using new office technology, regardless of the size of organisations. Both access almost the same information, indicating a possible breakdown in the traditional hierarchical structure of management, making secretaries more powerful with new roles and responsibilities. There are some differences due to historical and political backgrounds between the findings in both countries.  相似文献   

Academic choices and motivation: Diverse groups in Israel     

Khalid Arar  Ruth Abramovitz  Hanna Bar-Yishay  Neta Notzer 《Journal of Further & Higher Education》2017,41(5):642-656

Israel is a multi-cultural society with a Jewish majority and a large Arab minority. This study aims to examine whether Israeli Arab and Jewish students have different motivations and consider different factors when choosing a college for postgraduate studies. A case study, during the academic year 2010–11 administered questionnaires to 290 Jewish and Arab postgraduate students in a private academic college in order to investigate students’ motivations for postgraduate studies and choice of college. Findings indicated that the strongest motivation expressed by all the students is a desire for self-fulfilment. Motivation for social mobility and to help to empower their society is more important for Arab students. Convenience considerations (proximity to home, flexible entrance standards and employment prospects while studying) determined college choice for Jews and Arabs more than college reputation and teaching quality. Yet Arab students attach more importance than Jewish students to the college’s quality. It is concluded that postgraduate programmes should be more sensitive to diverse students’ needs.  相似文献   

Performance of beacon safety message dissemination in Vehicular Ad hoc NETworks （VANETs）     

YOUSEFI Saleh FATHY Mahmood BENSLIMANE Abderrahim 《浙江大学学报(A卷英文版)》2007,8(12):1990-2004

Currently, there is a growing belief that putting an IEEE 802.11-like radio into road vehicles can help the drivers to travel more safely. Message dissemination protocols are primordial for safety vehicular applications. There are two types of safety messages which may be exchanged between vehicles: alarm and beacon. In this paper we investigate the feasibility of deploying safety applications based on beacon message dissemination through extensive simulation study and pay special attention to the safety requirements. Vehicles are supposed to issue these messages periodically to announce to other vehicles their current situation and use received messages for preventing possible unsafe situations. We evaluate the performance of a single-hop dissemination protocol while taking into account the quality of service (QoS) metrics like delivery rate and delay. We realize that reliability is the main concern in beacon message dissemination. Thus, a new metric named effective range is defined which gives us more accurate facility for evaluating QoS in safety applications specifically. Then, in order to improve the performance, the effects of three parameters including vehicle's transmission range, message transmission's interval time and message payload size are studied. Due to special characteristics of the safety applications, we model the relationship between communication-level QoS and application-level QoS and evaluate them for different classes of safety applications. As a conclusion, the current technology of IEEE 802.11 MAC layer has still some challenges for automatic safety applications but it can provide acceptable QoS to driver assistance safety applications.  相似文献   

Investigating Omani Science Teachers’ Attitudes Towards Teaching Science: the Role of Gender and Teaching Experiences     

Abdullah Ambusaidi  Khalid Al-Farei 《International Journal of Science and Mathematics Education》2017,15(1):71-88

A 30-item questionnaire was designed to determine Omani science teachers’ attitudes toward teaching science and whether or not these attitudes differ according to gender and teaching experiences of teachers. The questionnaire items were divided into 3 domains: classroom preparation, managing hands-on science, and development appropriateness. The questionnaire was administered to 139 randomly selected science teachers who teach science in grades 5–10. The sample consisted of 72 male teachers and 67 female teachers, 57 teachers with teaching experience between 1 and 5 years and 82 teachers with teaching experience of 6 and more years. The sample was selected from 7 schools in 1 Educational Governorate in the Sultanate of Oman. The questionnaire reliability was calculated by an internal consistency method, using Cronbach’s alpha, which gave the value of 0.73 for all the items. The findings indicated that science teachers’ attitudes toward teaching science were positive. Furthermore, the results showed that there were statically significant differences in teachers’ attitudes due to gender in favor of the female teachers and in teaching experience in favor of teachers with long experience. The study proposed some recommendations to improve the science teachers’ attitude, especially male teachers towards science teaching. Paying more attention to in-service professional development programs, encouraging new teachers to attend some classes to observe experienced colleagues, and finally rewarding teachers morally, socially, and financially are some of these recommendations.  相似文献   

Assessing potential dietary toxicity of heavy metals in selected vegetables and food crops   总被引：3，自引：0，他引：3  

Islam Eu  Yang XE  He ZL  Mahmood Q 《Journal of Zhejiang University. Science. B》2007,8(1):1-13

Heavy metals, such as cadmium, copper, lead, chromium and mercury, are important environmental pollutants, particularly in areas with high anthropogenic pressure. Their presence in the atmosphere, soil and water, even in traces can cause serious problems to all organisms, and heavy metal bioaccumulation in the food chain especially can be highly dangerous to human health. Heavy metals enter the human body mainly through two routes namely： inhalation and ingestion, ingestion being the main route of exposure to these elements in human population. Heavy metals intake by human populations through food chain has been reported in many countries. Soil threshold for heavy metal toxicity is an important factor affecting soil environmental capacity of heavy metal and determines heavy metal cumulative loading limits. For soil-plant system, heavy metal toxicity threshold is the highest permissible content in the soil （total or bioavailable concentration） that does not pose any phytotoxic effects or heavy metals in the edible parts of the crops does not exceed food hygiene standards. Factors affecting the thresholds of dietary toxicity of heavy metal in soil-crop system include： soil type which includes soil pH, organic matter content, clay mineral and other soil chemical and biochemical properties; and crop species or cultivars regulated by genetic basis for heavy metal transport and accumulation in plants. In addition, the interactions of soil-plant root-microbes play important roles in regulating heavy metal movement from soil to the edible parts of crops. Agronomic practices such as fertilizer and water managements as well as crop rotation system can affect bioavailability and crop accumulation of heavy metals, thus influencing the thresholds for assessing dietary toxicity of heavy metals in the food chain. This paper reviews the phytotoxic effects and bioaccumulation of heavy metals in vegetables and food crops and assesses soil heavy metal thresholds for potential dietary toxicity.  相似文献   

Impact of light intensity on flowering time and plant quality of<Emphasis Type="Italic">Antirrhinum majus</Emphasis> L. cultivar Chimes White     

Munir?Muhammad?Email author  Jamil?Muhammad  Baloch?Jalal-ud-din  Khattak?Khalid?Rehman 《浙江大学学报(A卷英文版)》2004,5(4):400-405

Shades of different light intensities (29%, 43%, 54%, 60% or 68%) along with control (no shade) were studied to observe their effects on the flowering time and plant quality. A hyperbolic relationship was observed between different light intensities under shade, and time to flowering. The total number of flower buds showed a curvilinear relationship with light intensities. Growth parameters related to the plant characteristics such as plant height, leaf area and plant fresh weight were improved under shading treatments at the expense of flowering time and number of flower buds. However, both linear and polynomial models applied assumed that cultivar Chimes White was equally sensitive to light intensity throughout development.  相似文献   

Nitrogen transformations during co-composting of herbal residues, spent mushrooms, and sludge   总被引：1，自引：0，他引：1  

Dong-lei Wu  Ping Liu  Yan-zhang Luo  Guang-ming Tian  Qaisar Mahmood 《Journal of Zhejiang University. Science. B》2010,11(7):497-505

Sewage sludge composting is an important environmental measure. The reduction of nitrogen loss is a critical aim of compost maturation, and the addition of spent mushrooms (SMs) and herbal residues (HRs) may be helpful. To evaluate the nitrogen transformations during co-composting of sewage sludge, SMs, and HRs, windrows were constructed in a residual processing plant. Dewatered sewage sludge and sawdust were mixed with SMs and HRs at two proportions on a fresh weight basis, 3:1:1 (sewage sludge:sawdust:SMs or HRs) and 3:1:2 (sewage sludge:sawdust:SMs or HRs). The mixture was then composted for 40 d. Changes in the physicochemical characteristic of sewage sludge during composting were recorded and analyzed. Addition of SMs and HRs accelerated the temperature rise, mediating a quicker composting maturation time compared to control. The addition also resulted in lower nitrogen losses and higher nitrate nitrogen levels in the compost products. Among the windrows, SM and HR addition improved the nitrogen status. The total nitrogen (TN) and nitrogen losses for SM and HR treatments ranged from 22.45 to 24.99 g/kg and from 10.2% to 22.4% over the control values (18.66–21.57 g/kg and 40.5%–64.2%, respectively). The pile with the highest proportion of SMs (3:1:2 (sewage sludge:sawdust:SMs)) had the highest TN level and the lowest nitrogen loss. The germination index (GI) values for all samples at maturity were above 80%, demonstrating optimal maturity. The addition of SMs and HRs augments sewage composting.  相似文献   

Quality of web-based medical information on stable COPD: comparison of non-commercial and commercial websites     

Kunst H  Khan KS 《Health information and libraries journal》2002,19(1):42-48

The Internet provides an easy and accessible way to deliver medical information about the management of various diseases, both to practitioners and to their patients. As there is no control over who posts information on the Web, there is a risk that the interests of the web producer may bias the quality of information. The quality of medical information on the management of chronic obstructive pulmonary disease (COPD) on the Internet was evaluated, comparing non-commercial and commercial websites. An internet search was conducted to locate relevant websites using a metasearch engine. The quality of websites was scored on a scale of 0-10, based on three items about the credibility of the site and seven items about the accuracy of the information provided by the site. Quality differences between commercial and non-commercial websites were explored. The search revealed 23 relevant websites (12 noncommercial and 11 commercial). The overall quality of non-commercial websites was better than that of commercial websites (median score 7 vs. 4, P = 0.01). Compared to commercial sites, non-commercial websites more often provided information about cessation of smoking (100% vs. 64%, P = 0.03), preventative influenza vaccinations (42% vs. 9%, P = 0.07) and use of long-term oxygen therapy (92% vs. 45%, P = 0.02). Among websites providing information on COPD, commercial sites were much more likely to be of poorer quality compared to sites of non-commercial organizations. In particular, commercial sites do not provide information about simple preventative treatments. There is a need to be vigilant about the quality of health information about COPD on the Internet.  相似文献   

Incorporating the views of obstetric clinicians in implementing evidence-supported labour and delivery suite ward rounds: a case study     

Deshpande N  Publicover M  Gee H  Khan KS 《Health information and libraries journal》2003,20(2):86-94

Objectives: To implement evidence‐supported delivery suite ward rounds using strategies to overcome barriers. Design: Qualitative case study to identify barriers and a quantitative assessment of outcomes on ward rounds. Method: After an introduction to the proposed evidence‐supported delivery suite ward round reactions were elicited from 15 clinicians. Responses were categorized into barriers related to knowledge, skills, attitudes and behaviour. Using strategies to overcome these barriers, a weekly evidence‐supported ward round was established. During patient‐centred discussions, clinical questions were formulated. Following literature searches, evidence was acquired and appraised. Results: Clinicians had limited awareness about the potential benefits of a clinical librarian's support during ward rounds. They were unsure of their skills in evidence‐based practice. There was scepticism, fear of loss of autonomy, poor motivation and resistance to change. Clinicians identified several factors that could impinge on their practice. Using appropriate strategies when evidence‐supported ward rounds were conducted, 67 questions were raised. However only seven articles were appraised in time to affect decisions on that ward round. Conclusions: Knowledge of barriers was helpful in developing plans for implementation of evidence‐supported ward rounds. The pilot study indicates the feasibility of this approach.  相似文献