共查询到20条相似文献，搜索用时 15 毫秒
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BackgroundProsopis, or mesquite (Prosopis juliflora (Sw.) DC.), was introduced in Saudi Arabia several decades ago and is heavily used in street, roadside, and park plantations. It shows great adaptation to the prevailing climatic conditions such as high temperature, severe drought, and salinity and spreads naturally in many parts of the Kingdom. This research was conducted to isolate allergen proteins and biogenic amines from the pollen grains of P. juliflora genotypes in Saudi Arabia from two regions, namely Al-Qassim and Eastern regions.ResultsThe results showed that 18 different allergen proteins were detected in P. juliflora genotypes, with molecular weight ranging from 14 to 97 kDa. Moreover, P. juliflora genotypes from the two studied regions contained eight biogenic amines, namely histamine, tyramine, tryptamine, β-phenylethylamine, butricine, codapherine, spermidine, and spermine. All genotypes from the Al-Qassim region were found to contain all eight amines, while in the Eastern region, histamine was absent in three genotypes, spermine was absent in six genotypes, and spermidine was absent in three genotypes. Genotypes B23, E20, and E21 had the lowest biogenic amine quantity.ConclusionsAll identified proteins from mesquite trees from both regions (Eastern and Al-Qassim) cause allergies in patients who are sensitive to pollen grains. Bioamines, except histamine and tyramine, were recorded at varying concentrations in different genotypes. 相似文献
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Ovidiu Șerban Nicholas Thapen Brendan Maginnis Chris Hankin Virginia Foot 《Information processing & management》2019,56(3):1166-1184
Interest in real-time syndromic surveillance based on social media data has greatly increased in recent years. The ability to detect disease outbreaks earlier than traditional methods would be highly useful for public health officials. This paper describes a software system which is built upon recent developments in machine learning and data processing to achieve this goal. The system is built from reusable modules integrated into data processing pipelines that are easily deployable and configurable. It applies deep learning to the problem of classifying health-related tweets and is able to do so with high accuracy. It has the capability to detect illness outbreaks from Twitter data and then to build up and display information about these outbreaks, including relevant news articles, to provide situational awareness. It also provides nowcasting functionality of current disease levels from previous clinical data combined with Twitter data.The preliminary results are promising, with the system being able to detect outbreaks of influenza-like illness symptoms which could then be confirmed by existing official sources. The Nowcasting module shows that using social media data can improve prediction for multiple diseases over simply using traditional data sources. 相似文献
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Mobile banking is one of the most promising technologies that has emerged in recent years and could prove to have considerable value to both banks and customers. Thus, this study recognises the need to test the main factors that could predict the use of mobile banking as well as how using such a system could contribute to both customer satisfaction and customer loyalty. The conceptual model of this study combines two models (i.e. UTAUT2 and the D&M IS Success Model). A questionnaire survey was conducted to collect the required data from convenience sampling of Saudi bank customers. The main factors – performance expectancy, price value, facilitating conditions, hedonic motivation, habit, system quality and service quality – were found to have a significant impact on actual use behaviour. This study was cross-sectional, therefore future studies should implement longitudinal studies in order to re-collect the findings. Further, this study adopted convenience sampling of Saudi M-Banking users. This may adversely impact the issue of generalisability to the whole population. The gap in the M-Banking literature in Saudi Arabia would be bridged by proposing a comprehensive conceptual model that scrupulously clarifies the use of M-Banking from the perspective of Saudi users. Furthermore, this study would consider the adoption of numeric data in order to inferentially analyse them using SEM. This in turn would assist in generalising the findings to the whole Saudi population. 相似文献
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Abdulrahman Essa Al Lily 《The Information Society》2013,29(5):407-413
This article investigates the possibility that many users of the mobile phone communication apps communicate with one another but do not necessarily convey or receive any information, that is, anything that informs. A qualitative and quantitative investigation was carried out in Saudi Arabia, looking at how informative the messages were that Saudi society exchanged over mobile phone communication apps. The main finding was that a large number of the messages exchanged among Saudi users conveyed no actual information or only trivial information. In other words, with the increasing ease of digital communication, users may overuse technology merely to communicate for the sake of communication, with no interest in actually being informed by anything, thus suffering from “information thinness.” 相似文献
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Whereas there is a growing literature that investigates knowledge management (KM) in service corporates, yet the overview and understanding of KM in large-sized service organisations is yet limited and sparse. Transitional economies, like of Saudi Arabia, are highly motivated to establish a knowledge based structure both economically and socially. There is an urgent need for exploring the current situation of KM tools usage and of perspectives on knowledge and knowledge management, as a start by large sized service organisations. Towards further understanding in this regard, this paper explores the status and potentials of KM implementation scoped to Saudi large-sized service organisations. The paper triangulated an interviewer-administrated questionnaire and focus groups to gather the data. The results indicate that although the weighted average of KM tools/methods deployment (being deployed or can possibly be deployed) reaches 79%; however, the written comments in front of each tool indicates that the participants’ understanding of what KM seems distorted, which is confirmed in the coding of their definitions of the term ‘Knowledge’. The participants identified leadership and strategy formulation as the top two critical success factors. A number of other results are presented and several issues were identified for future research. 相似文献
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全球贸易隐含碳净流动网络构建及社团发现分析 总被引：1，自引：0，他引：1
采用Eora数据库和MRIO多区域投入产出模型对2000年与2015年189个国家（地区）的国（区）内需求隐含碳排放量、出口隐含碳排放量和进口隐含碳排放量进行测算;在此基础上构建全球贸易隐含碳净流动网络,基于网络视角对全球贸易隐含碳流动及社团划分问题进行全局分析,揭示不同国家（地区）在全球贸易隐含碳流动网络中的地位及关系演变趋势。研究发现：①贸易隐含碳净流出是中国、印度、伊朗、哈萨克斯坦、阿尔及利亚、南非等发展中国家碳排放快速增长的关键原因之一,隐含碳净进口则对美国、日本、德国、英国、法国等发达国家的碳排放量下降贡献了重要力量;②虽然美国、日本、法国等国家的隐含碳净进口总量趋于下降,但是从中国、印度等主要隐含碳净进口地流入的隐含碳排放量却一直在增长,净进口来源地呈现集中趋势;③2000年与2015年全球隐含碳净流动网络均包含4个主要社团,社团核心由中国、俄罗斯、沙特阿拉伯、伊拉克转变为中国、印度、俄罗斯和沙特阿拉伯,其中中国和印度的社团核心地位加强,主导的社团规模不断扩大,俄罗斯和沙特阿拉伯的社团辐射能力则有所减弱。由于处于同一社团的各贸易国（地区）的隐含碳流动更为密切,因此,社团内部成员国可作为国际应对气候变化的重点支持对象。 相似文献
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首先,介绍了地震形成的自然因素和非自然因素,并对其发生原因进行了分析和研究;其次,通过对1999-2009年间的地震现场的灾害调查资料和损失评估的资料进行研究,对其进行分析与处理,采取以实际烈度区作为分配单元,建立适用于县级区域小尺度的地震风险分析模型;最后基于烈度的地震分析模型与基于建筑物易损性地震分析模型预测结果进行比较,由此说明在县级区域小尺度上,地震风险分析模型的适用性。 相似文献
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本文从降低供应风险的角度,对2020年前我国原油进口结构的优化路径进行了定量分析。并且为应对伊朗原油出口的减少提出了数量化的政策建议。研究结论显示,由于我国对世界原油的需求将会持续旺盛,在未来几年内,我国需要大量增加从俄罗斯、科威特、阿联酋、卡塔尔、墨西哥及阿尔及利亚等传统产油国的进口,同时减少对沙特阿拉伯、安哥拉、苏丹和伊朗的原油依赖。从未来原油进口的地区分布上看,中东地区依然是我国原油进口的主要来源地,同时也是供应风险最大的地区。为应对伊朗石油禁运,我国应该增加从加拿大、墨西哥、尼日利亚和卡塔尔等国的原油进口来弥补供应缺口,并满足国内快速增长的原油消费需求。 相似文献
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Unstructured tweet feeds are becoming the source of real-time information for various events. However, extracting actionable information in real-time from this unstructured text data is a challenging task. Hence, researchers are employing word embedding approach to classify unstructured text data. We set our study in the contexts of the 2014 Ebola and 2016 Zika outbreaks and probed the accuracy of domain-specific word vectors for identifying crisis-related actionable tweets. Our findings suggest that relatively smaller domain-specific input corpora from the Twitter corpus are better in extracting meaningful semantic relationship than generic pre-trained Word2Vec (contrived from Google News) or GloVe (of Stanford NLP group). However, domain-specific quality tweet corpora during the early stages of outbreaks are normally scant, and identifying actionable tweets during early stages is crucial to stemming the proliferation of an outbreak. To overcome this challenge, we consider scholarly abstracts, related to Ebola and Zika virus, from PubMed and probe the efficiency of cross-domain resource utilization for word vector generation. Our findings demonstrate that the relevance of PubMed abstracts for the training purpose when Twitter data (as input corpus) would be scant during the early stages of the outbreak. Thus, this approach can be implemented to handle future outbreaks in real time. We also explore the accuracy of our word vectors for various model architectures and hyper-parameter settings. We observe that Skip-gram accuracies are better than CBOW, and higher dimensions yield better accuracy. 相似文献
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Vishanth Weerakkody Ramzi El-Haddadeh Faris Al-Sobhi Mahmud Akhter Shareef Yogesh K. Dwivedi 《International Journal of Information Management》2013
The adoption and diffusion of electronic government is often impeded by many social and individual factors relating to citizens. In this respect, intermediaries have emerged as a new model for delivering e-government services to overcome such obstacles. This study aims to examine the role of intermediaries in facilitating e-government adoption and diffusion using a survey based empirical study of 502 participants in Madinah City in Saudi Arabia. An extended UTAUT model is used as the theoretical basis utilizing trust in the Internet and Intermediaries. The results of this study show that there are significant relationships among the factors that influence intention to use e-government, namely, performance expectancy, effort expectancy, and trust of intermediary. In addition, the findings show that there is a significant relationship between facilitating conditions and usage behavior proving that intermediaries can influence adoption of e-government services. 相似文献
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Knowledge is regarded as a strategic resource in organizations; thus the leverage of knowledge is a key managerial issue. Knowledge creation, sharing and dissemination are the main activities in knowledge management. This study examines the influence that social and technological factors, such as learning culture and IT use, could have on knowledge sharing among students of the King Fahd University of Petroleum and Minerals in Saudi Arabia. A cross-sectional survey was used as a research method for data collection and 302 valid responses were collected from all the three categories of students that include graduates, undergraduates and preparatory students. The results show that there is a significant positive relationship between both student learning culture and IT use and students’ knowledge sharing. The limitations of this study and practical implications, along with directions for further research are discussed. 相似文献
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Waleed Tamimi Esam Albanyan Yasmin Altwaijri Hani Tamim Fahad Alhussein 《Indian journal of clinical biochemistry : IJCB》2012,27(2):141-146
Reference intervals for pubertal characteristics are influenced by genetic, geographic, dietary and socioeconomic factors. Therefore, the aim of this study was to establish age-specific reference intervals of glucose and lipid levels among local school children. This was cross-sectional study, conducted among Saudi school children. Fasting blood samples were collected from 2149 children, 1138 (53%) boys and 1011 (47%) girls, aged 6 to 18 years old. Samples were analyzed on the Architect c8000 Chemistry System (Abbott Diagnostics, USA) for glucose, cholesterol, triglycerides, HDL and LDL. Reference intervals were established by nonparametric methods between the 2.5th and 97.5th percentiles. Significant differences were observed between boys and girls for cholesterol and triglycerides levels in all age groups (P < 0.02). Only at age 6–7 years and at adolescents, HDL and LDL levels were found to be significant (P < 0.001). No significant differences were seen in glucose levels except at age 12 to 13 years. Saudi children have comparable serum cholesterol levels than their Western counterparts. This may reflect changing dietary habits and increasing affluence in Saudi Arabia. Increased lipid screening is anticipated, and these reference intervals will aid in the early assessment of cardiovascular and diabetes risk in Saudi pediatric populations. 相似文献
13.
《Research Policy》2022,51(1):104400
In standard economic theory, government support of science is expected to confer external benefits and ‘crowd-in’ additional private sector research. However, higher rates of economic growth from this effect are not easily discerned from the long run data, and government and business financed R&D have moved in opposite directions (as a proportion of GDP) since the early 1960s in the US and elsewhere. This paper looks at potential sources of ‘crowding out’ as well as ‘crowding in,’ and compares standard analysis with a ‘contribution good’ model of science. Two different policy issues are identified – the assembly of ‘critical mass’ for the ‘kick starting’ of commercial science, and the expansion of commercial science beyond its ‘private equilibrium’. We analyse the allocation of scarce business as well as scientific skills between sectors. The model produces regions of both crowding in and out. The latter dominates for very high wages in the public sector as the government deprives the private sector of the means to exploit new knowledge. 相似文献
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Basheer M. Al-Ghazali Bilal Afsar 《The Journal of High Technology Management Research》2021,32(1):100395
PurposeExploring factors that can influence employee's entrepreneurial intentions is critical to entrepreneurship and entrepreneurial practice. This study is going to examine the effect of narcissism on entrepreneurial intentions. Moreover, the mediating role of entrepreneurial self-efficacy in narcissism-entrepreneurial intentions link is also tested. Lastly, how environmental complexity moderates these relationships is explored.Design/methodology/approachData were collected from 362 employees working in technology incubators and science parks of Saudi Arabia. These technology incubators and science parks were established by the Saudi government as a part of entrepreneurship ecosystem evolution strategy to encourage and support entrepreneurial innovations.FindingsThe results show that narcissistic employees display greater levels of entrepreneurial intentions, and entrepreneurial self-efficacy mediates the effect of narcissism on entrepreneurial intentions; and environmental complexity moderates the narcissism-entrepreneurial intentions link.OriginalityThe effect of narcissism on entrepreneurial intentions has not been examined before. This study extends knowledge on entrepreneurial innovations by linking narcissism with entrepreneurial intentions through mediation of entrepreneurial self-efficacy and moderation of environmental complexity. 相似文献
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本文采用文献研究和因子分析法建立评价指标体系,选取我国生态治理中具有代表性的区域--陕西省,运用DEA-Malmqusit方法测算了2004至2014年间生态经济治理优化决策效率。采用output-SBM模型对2014年我国31个省份的生态经济治理优化决策效率进行测算。结果表明,陕西省的生态经济治理优化决策效率呈下降趋势;中、西部省份生态经济治理优化决策效率整体不及东部省份的效率值;东部省份在森林蓄积量和保护区面积占辖区面积比重两个产出指标存在产出不足现象,中、西部省份在人均水资源量和工业废水排放量两个产出指标存在产出不足现象。 相似文献
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Social commerce is becoming an important hub for product sourcing, which helps companies to connect with customers and to gain competitive advantages. However, very little empirical research that focuses on small-and medium-sized enterprises (SMEs) has been conducted to date. This study examines factors that affect social commerce adoption by SMEs. Using the Technology-Organisation-Environment (TOE) as the theoretical framework, the researchers tested the model and related hypotheses, employing structural equation modelling. The results from a survey of 181 SMEs in Saudi Arabia indicate that trading partner pressure in the environmental context, followed by top management support in the organisational context, and perceived usefulness in the technological context, have the most significant influence on behavioural intention to use social commerce. The research contributions and conclusion as well as limitations and future research directions are presented. 相似文献
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Google Scholar的数据整合研究 总被引：1，自引：0，他引：1
Google Scholar对各种学术资源数据库进行了有效而全面的集成,通过同一界面简单查询可以得到不同语种、各种来源的文献。本文通过实例对Google Scholar整合的数据进行研究,结果显示整合的中文数据主要来自维普与万方期刊,英文数据来源广泛。通过比较4个专利平台和几个常用全文数据库,Google Scholar对美国专利和全文数据库都有很好的覆盖率。本文还讨论了Google Scholar对于相同文献不同来源的数据处理。 相似文献
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企业新产品研发项目成功标准差异性实证分析--基于时间因素的影响 总被引：1，自引：0，他引：1
以时间因素对企业新产品研发（NPD）项目成功标准的影响为研究目标，在国内外相关文献分析的基础之上，提出了五条基于时间因素的企业NPD项目成功标准差异性假设，通过对国内82家企业进行的问卷调查而采集到的数据，使用SPSS软件进行统计学分析，最终验证了五条假设基本成立。 相似文献