未来的巴基斯坦地质公园——盐岭          下载免费PDF全文

缅恩·哈森·艾哈迈德 《自然科学博物馆研究》2018,(1):36-39

盐岭包括六个峡谷,具有出露充分的地质学和古生物学特征,并且交通便利。这些特点吸引了研究者对这个独特地区的地质时代测定方面的浓厚兴趣,开始对寒武纪三叶虫、二叠纪腕足类、三叠系下统菊石、下第三系大型有孔虫和上第三系及第四纪脊椎动物产生的古地理进行了研究调查。在地质学家眼中,这些盐岭峡谷充满着如此美妙的地质遗址,堪称为世界上独特的野外自然历史博物馆,同时也可能被建设为巴基斯坦的一个地质公园。  相似文献   

Puberty Predicts Approach But Not Avoidance on the Iowa Gambling Task in a Multinational Sample          下载免费PDF全文

Grace Icenogle  Laurence Steinberg  Thomas M. Olino  Elizabeth P. Shulman  Jason Chein  Liane P. Alampay  Suha M. Al‐Hassan  Hanan M. S. Takash  Dario Bacchini  Lei Chang  Nandita Chaudhary  Laura Di Giunta  Kenneth A. Dodge  Kostas A. Fanti  Jennifer E. Lansford  Patrick S. Malone  Paul Oburu  Concetta Pastorelli  Ann T. Skinner  Emma Sorbring  Sombat Tapanya  Liliana M. Uribe Tirado 《Child development》2017,88(5):1598-1614

According to the dual systems model of adolescent risk taking, sensation seeking and impulse control follow different developmental trajectories across adolescence and are governed by two different brain systems. The authors tested whether different underlying processes also drive age differences in reward approach and cost avoidance. Using a modified Iowa Gambling Task in a multinational, cross‐sectional sample of 3,234 adolescents (ages 9–17; M = 12.87, SD = 2.36), pubertal maturation, but not age, predicted reward approach, mediated through higher sensation seeking. In contrast, age, but not pubertal maturation, predicted increased cost avoidance, mediated through greater impulse control. These findings add to evidence that adolescent behavior is best understood as the product of two interacting, but independently developing, brain systems.  相似文献   

MRI and PET images fusion based on human retina model   总被引：1，自引：0，他引：1  

DANESHVAR Sabalan GHASSEMIAN Hassan 《浙江大学学报(A卷英文版)》2007,8(10):1624-1632

The diagnostic potential of brain positron emission tomography (PET) imaging is limited by low spatial resolution. For solving this problem we propose a technique for the fusion of PET and MRI images. This fusion is a trade-off between the spectral information extracted from PET images and the spatial information extracted from high spatial resolution MRI. The proposed method can control this trade-off. To achieve this goal, it is necessary to build a multiscale fusion model, based on the retinal cell photoreceptors model. This paper introduces general prospects of this model, and its application in multispectral medical image fusion. Results showed that the proposed method preserves more spectral features with less spatial distortion. Comparing with hue-intensity-saturation (HIS), discrete wavelet transform (DWT), wavelet-based sharpening and wavelet-à trous transform methods, the best spectral and spatial quality is only achieved simultaneously with the proposed feature-based data fusion method. This method does not require resampling images, which is an advantage over the other methods, and can perform in any aspect ratio between the pixels of MRI and PET images.  相似文献   

Evaluation of tactical training in team handball by means of artificial neural networks     

Amr Hassan  Norbert Schrapf  Wael Ramadan  Markus Tilp 《Journal of sports sciences》2017,35(7):642-647

While tactical performance in competition has been analysed extensively, the assessment of training processes of tactical behaviour has rather been neglected in the literature. Therefore, the purpose of this study is to provide a methodology to assess the acquisition and implementation of offensive tactical behaviour in team handball. The use of game analysis software combined with an artificial neural network (ANN) software enabled identifying tactical target patterns from high level junior players based on their positions during offensive actions. These patterns were then trained by an amateur junior handball team (n = 14, 17 (0.5) years)). Following 6 weeks of tactical training an exhibition game was performed where the players were advised to use the target patterns as often as possible. Subsequently, the position data of the game was analysed with an ANN. The test revealed that 58% of the played patterns could be related to the trained target patterns. The similarity between executed patterns and target patterns was assessed by calculating the mean distance between key positions of the players in the game and the target pattern which was 0.49 (0.20) m. In summary, the presented method appears to be a valid instrument to assess tactical training.  相似文献   

Still as divided as ever? Northern Ireland,football and identity 20 years after the Good Friday Agreement     

David Hassan  Kyle Ferguson 《Soccer & Society》2019,20(7-8):1071-1083

ABSTRACT

The signing of the Belfast-Good Friday Agreement in 1998 was widely welcomed by those that interpreted it as offering Northern Ireland the prospect of a fresh start, free from inter-ethnic violence that had blighted the country for almost 80 years. Soon it began to be seen by some observers as the genesis too of a ‘Northern Irish’ identity, as the community at large came to reconcile themselves to their common lives in Northern Ireland. Sport was also viewed as offering the prospect of adding weight to this sense of a shared journey and governing bodies of sport unquestionably played their parts in supporting a settled political environment where division had previously existed. This article examines the still contested concept of a ‘Northern Irish’ identity and critically reviews its real currency in a divided society, even if sport and, specifically, association football offers renewed hope for something better in the time ahead.  相似文献   

Sports tourism does not have to be accompanied by crime: a case for the NFL Super Bowl     

Hassan Tajalli  Alejandra Iraide Peña 《Journal of Sport Tourism》2017,21(1):15-32

The Routine Activities Theory suggests that when there is the presence of a motivated offender, a suitable target, and the absence of a capable guardian, crime has the opportunity to occur. Large sporting events accompanied by massive tourists bring these ingredients of crime together. The purpose of this study is to find out whether the crime rates spike in the host cities during the high tourist month of the Super Bowl. Twenty-four months of crime rates on eight types of crimes were obtained for every American city that has hosted the Super Bowl. Panel Data Analysis is used to test the Hypotheses of this study. The findings do not show a spike in crime rates during the month of Super Bowl for any of the crimes examined in this study. It is in the economic interests of all stakeholders to provide a safe and secure venue free of crimes for sports tourists.  相似文献   

Convergence Between Platforms in the Newsroom     

Mohamed Morsy Hassan 《Journalism Practice》2019,13(4):476-492

Through ethnographic observation and content analysis, this study aims to classify the Al-Jazeera Mubasher (AJM) newsroom according to the Schantin model of newsrooms, describe the network’s convergence level based on the Dailey, Demo, and Spillman Dynamic Scale Model, and present a unique model elucidating how, specifically, convergence works at AJM. Based on the Schantin model of newsrooms, AJM can be classified as a second-generation newsroom, a “cross-media platforms newsroom.” Convergence among the different platforms of AJM is considerable, but still below full convergence level. Accordingly, the AJM newsroom can be classified into the fourth level of the Dailey et al. Dynamic Scale Model — “content sharing.” The unique AJM-specific model presented near the end of this paper depicts the ways in which different AJM platforms function and interact inside the newsroom, explains the degree of convergence between platforms, and classifies the newsroom in terms of its convergence level.  相似文献   

Utilization of discrete transforms to conquer the problems of multi-tone systems     

Samir Abd Elghafar  Salaheldin M. Diab  Bassiouny M. Sallam  Emad S. Hassan  Mona Shokair  Waleed Al-Nauimy  Moawad I. Dessouky  El-Sayed M. El-Rabaie  Saleh Alshebeili  Fathi E. Abd El-Samie 《Journal of The Franklin Institute》2014

This paper presents a new implementation of discrete multi-tone (DMT) systems based on different discrete transforms that include the discrete sine transform (DST), discrete cosine transform (DCT), and discrete wavelet transform (DWT). The implementation also considers time-domain equalization to mitigate channel distortion. Compared to the fast Fourier transform discrete multi-tone (FFT-DMT) system, the proposed implementations have an advantage in that their energy-compaction property helps in reducing the channel effects. The performance of the DST-DMT, DCT-DMT, DWT-DMT, and FFT-DMT systems, employing a time-domain equalizer (TEQ), is investigated in the paper. It has been demonstrated by computer simulations that the proposed implementations outperform the FFT-DMT system and that the utilization of the TEQ can lead to higher bit rates  相似文献   

Measuring attitude towards learning science in Malaysian secondary school context: implications for teaching     

Sharifah Sariah Syed Hassan 《International Journal of Science Education》2013,35(16):2044-2059

ABSTRACT

The aim of education is to ensure a holistic development towards knowledge and well-being. Despite exhaustive effort on embedding twenty-first century skills in science teaching, students show lack of interest to learn and pursue their science careers. This present study has attempted to develop an instrument for measuring attitude towards science learning. The purpose was to ensure valid items were identified to measure all aspects of attitude namely affect, behaviour and cognitive. The study of attitude in science will determine the direction on how teaching strategies can be successful in promoting interest in learning. The study has been underpinned from the theories related to Theory of Reasoned Action, Constructivist learning and Connectivism. Samples from three secondary schools were selected based on proportionate stratified random sampling. 350 samples were targeted to respond to self-constructed questionnaires. Confirmatory Factor Analysis (CFA) was employed to prove the hypothesised 5-factor measurement model. The results have supported a model fit with positive interactions between the factors are evident. The study has proven the theoretical contributions which embark on holistic development of an individual to ensure attitude is moulded. The emotional and spiritual aspects of learning are needed to ensure positive contribution to the social dynamic. In this paper, the discussions are elaborated from the standpoints of theories and practical importance. The results have contributed to a theoretical model of science teaching method.  相似文献   

Search systems and their features: What college students use to find and save information     

Jingjing Liu  Hassan Zamir  Yuan Li  Samantha K. Hastings 《Library & information science research》2018,40(2):118-124

College students have often been surveyed about their general information seeking behaviors. However, little has been done to explore what specific system features they use to find and save information when they are working on their real-life tasks. In this study, 32 college students were invited to an information interaction lab for a session in which they recalled a recently finished task and worked on a to-be-finished task using a computer in the lab. They were asked to complete questionnaires regarding what systems they used to finish their tasks and what features were helpful for searching and for saving information. Results showed that college students rely more heavily on the Internet sources than on library sources, even for their course related work. The study identified fourteen categories of system features helpful for information search and eight categories helpful for information saving. The findings have implications for designing systems that will better help people accomplish their tasks.  相似文献