52 research outputs found
A microsimulation-based analysis for driving behaviour modelling on a congested expressway
No full textRecently, simulation models have been widely used around the world to evaluate the performance of different traffic facilities and management strategies for efficient and sustainable transportation systems. One of the keys factors for ensuring the reliability of the models in reflecting local conditions is the calibration and validation of microsimulation models. The majority of the existing calibration efforts focus is on the experimental designs of driver behaviour and lane-changing parameters. Towards this end, this paper describes the necessary procedure for the calibration and validation of a microscopic model using the VISSIM software, during peak hours. The procedure is applied on Muscat Expressway in the Sultanate of Oman. The calibration parameters and the measure-of-effectiveness are identified by using multi-parameter sensitivity analysis. The optimum values for these parameters are obtained by minimising errors between simulated data and field data. In our proposed model, we used traffic volume and travel speed for model calibration, as well as average travel time for validation of the calibrated model. The achieved results showed that driving characteristics significantly impacted the merging/diverging traffic flow ratio in the merging area, the link length and the distance between on-ramps and off-ramps, as well as the percentage of heavy vehicles. The results also showed that having both the advanced merging and cooperative lane-change settings active, along with safety distance reduction factor, necessary lane change, minimum headway (front/rear), and emergency stop, had a significant influence on simulation precision, especially at on-ramps and off-ramps. Finally, our proposed model can be utilized as a base for future traffic strategy analysis and intelligent transportation systems evaluation to help decision makers with long-term and sustainable development decisionsFarrag, SG (corresponding author), Hasselt Univ, Transportat Res Inst, Hasselt, Belgium.
[email protected]; [email protected]; [email protected]; [email protected]; [email protected], SG (corresponding author), Hasselt Univ, Transportat Res Inst, Hasselt, Belgium.
[email protected]; [email protected]; [email protected]; [email protected]; [email protected]
The architectural and functional specifications of intrinsic muscles of the fore limb of the Egyptian Baladi goats (Capra hircus)
No full textCapacity Building in the Arab Nonprofit Sector: A Scoping Review and Preliminary Bibliometric Insights
No full textArab countries are pursuing ambitious development agendas, modernizing while preserving cultural identities. Nonprofit organizations (NPOs) play vital roles across social, economic, and environmental sectors, yet research on capacity building remains limited. Guided by PRISMA-ScR, this bilingual review (English and Arabic) retrieved 219 records (2012–2023), of which only 20 met the inclusion criteria. A small-scale bibliometric analysis identified key concepts involving institutional development, the NPO watchdog function, and Islamic social finance. This review contributes to global capacity-building theories by unveiling region-specific factors, such as localized volunteering and religious endowments, that both enrich and challenge conventional NPO models. While highlighting pressing gaps for empirical and conceptual work, it offers actionable insights for policymakers and nonprofit leaders seeking to strengthen Arab NPO interventions. Ultimately, it reframes capacity-building dialogues, revealing how Arab NPOs can advance broader development agendas. The data sets generated and/or analyzed during this study are available from the corresponding author on request.This research was supported by Qatar University under grant NPRP-14S-0303-210015, funded by the Qatar Research, Development, and Innovation (QRDI) Council
Assessing the impact of Bacillus strains mixture probiotic on water quality, growth performance, blood profile and intestinal morphology of Nile tilapia, Oreochromis niloticus
No full textThe aim of this study was to assess the impact of a commercial probiotic, Sanolife PRO‐F, on water quality, growth performance, blood profiles and intestinal morphometry of monosex Nile tilapia. A field trial was conducted for 10 weeks in which tilapia fingerlings (20 ± 1.26 g) were randomly distributed into three replicate ponds which were subdivided into three treatment groups, receiving Sanolife PRO‐F at 0 (B0), 0.1 (B1) and 0.2 (B2) g/kg diet, respectively. The results showed a significant improvement in growth performance, feed conversion ratio and blood profiles in tilapia fed on treated diets. The whole intestinal lengths, anterior and terminal intestinal villi heights and anterior goblet cells count were greater in tilapia fed on treated diets. There were no noticeable differences in growth and intestinal morphology between tilapia fed on B1 and B2 diets. The ammonia concentration in water was lower with B1 diet while electric conductivity, salinity and total dissolved solids were higher with the B2 diet. The pH level of pond water was enhanced by both diets, B1 and B2. In conclusion, application of Sanolife PRO‐F at 0.1–0.2 g/kg diet might have beneficial effects on growth, immunity, stress responses and gut health and function as well as the water quality of farmed Nile tilapia
Comparative glycoconjugates histochemistry of proventriculus of chicken, ducks and geese
No full textMapping and interpreting a decision-making framework for the implicit managerial theory in the Arab Gulf States
No full textThis article developed an empirical design to examine the direct effects of four dimensions of the strategic decision-making process (SDMP) on the organizational innovation in the context of cultural value characteristics of executive managers in Qatar. The study used the cultural relativity theory to explain and advance hypotheses regarding the associations between SDMP dimensions, culture attributes, and innovation performance in an input-process-outcome model. To test the raised research hypotheses of the proposed framework, the methodology of structural equation models was used. Based on quantitative evidence of 140 Qatari public and private organizations, the results demonstrated the following three major issues: (1) strategic decision-making practices have a direct and more significant impact on process innovation performance than product/service innovation performance, (2) innovation performance is both process and context specific, and (3) certain contextualizing constructs verify a particular cultural orientation. The Author(s) 2014.Scopu
Spatio‐temporal hydrological model structure and parametrization analysis
No full textMany grid‐based spatial hydrological models suffer from the complexity of setting up a coherent spatial structure to calibrate such a complex, highly parameterized system. There are essential aspects of model‐building to be taken into account: spatial resolution, the routing equation limitations, and calibration of spatial parameters, and their influence on modeling results, all are decisions that are often made without adequate analysis. In this research, an experimental analysis of grid discretization level, an analysis of processes integration, and the routing concepts are ana-lyzed. The HBV‐96 model is set up for each cell, and later on, cells are integrated into an interlinked modeling system (Hapi). The Jiboa River Basin in El Salvador is used as a case study. The first concept tested is the model structure temporal responses, which are highly linked to the runoff dynam-ics. By changing the runoff generation model description, we explore the responses to events. Two routing models are considered: Muskingum, which routes the runoff from each cell following the river network, and Maxbas, which routes the runoff directly to the outlet. The second concept is the spatial representation, where the model is built and tested for different spatial resolutions (500 m, 1 km, 2 km, and 4 km). The results show that the spatial sensitivity of the resolution is highly linked to the routing method, and it was found that routing sensitivity influenced the model performance more than the spatial discretization, and allowing for coarser discretization makes the model sim-pler and computationally faster. Slight performance improvement is gained by using different pa-rameters’ values for each cell. It was found that the 2 km cell size corresponds to the least model error values. The proposed hydrological modeling codes have been published as open‐source.</p
Open access in light of Arab intellectual production: bibliography
No full textتهدف هذه الوراقية إلى إعلام الباحثين بالإنتاج الفكري العربي - الورقي والإلكتروني - المنشور في موضوع الوصول الحر، والكشف عن المجهودات الفكرية التي أُنجزت لدعم هذا المبدأ الحيوي في نظام الاتصال العلمي المعاصر في المجتمع العربي، ومن ثم تنبيه المجتمع وتوجيهه للانخراط في المسارات المختلفة لهذه الحركة وقطف بعض ثمارها البحثية والعلمية والتعليمية.
وبالرغم من أن طرح هذا الموضوع على مائدة البحث العلمي العربي يعد جديدًا نسبيًا، إلا أنه لقى زخمًا وتشجيعًـا من بعض الباحثين والمؤسسات، ودعَّم ذلك بعض المبادرات الهادفة إلى إثراء المحتوى العربي على الشبكة العنكبوتية. كما عُقد ، في السنتين الأخيرتين، بعض المؤتمرات وورش العمل التي انصبت كليةً ، أو انصب بعض دراساتها على هذا الموضوع.
وتغطي هذه الوراقية الإنتاج الفكري العربي في موضوع الوصول الحر للمعلومات والموضوعات ذات الصلة به، من مقالات الدوريات المتخصصة والعامة، ومقالات الصحف، ومقالات الموسوعات، والكتب، وفصول الكتب، وأعمال المؤتمرات والندوات وورش العمل، والتقارير، والوثائق الرسمية، ... إلى آخره من أنماط الإنتاج الفكري. ونلاحظ هنا أن هناك بعض المواد التي تعد من قبيل الإنتاج الفكري غير المنشور، مثل بعض بحوث المؤتمرات والندوات ومخططات الرسائل الجامعية، وقد آثرنا حصرها للتعريف وإحاطة للباحثين بها.
وقد حاولنا هنا تتبع الإنتاج الفكري العربي في هذا الموضوع في مظانه المختلفة. كما بذلنا جهدنا في تتبع الإنتاج الفكري المنشور إلكترونيا على الشبكة، وقمنا بربط النسخ المطبوعة ورقيا من الإنتاج الفكري محل الحصر بنسخها الإلكترونية المتاحة على الإنترنت متى ما توافر ذلك.
وتم تقسيم الوراقية إلى تقسيمات موضوعية دقيقة، وتم استخدام تقسيمات متفرعة من بعضها عندما اقتضت الضرورة ذلك. فيما تم ترتيب المواد تحت التقسيمات الموضوعية وفقا لأسماء المؤلفين، وبالعناوين للمواد التي لا مؤلف صريح لها.This bibliography aims to inform researchers of the Arab intellectual production - paper and electronic - published on the subject of open access, and to reveal the intellectual efforts that have been accomplished to support this vital principle in the contemporary scientific communication system in Arab society, and then alert and direct society to engage in the various paths of this movement and collect Some of its research, scientific and educational fruits.
Although bringing this topic to the table of Arab scientific research is relatively new, it has received momentum and encouragement from some researchers and institutions, and this has been supported by some initiatives aimed at enriching Arabic content on the Internet. In the last two years, some conferences and workshops were held that were entirely focused, or some of their studies were focused on this topic.
This bibliography covers Arab intellectual production on the subject of free access to information and topics related to it, from articles in specialized and general periodicals, newspaper articles, encyclopedia articles, books, book chapters, conference proceedings, seminars, workshops, reports, official documents, etc. Patterns of intellectual production. We note here that there are some materials that are considered unpublished intellectual production, such as some conference research, seminars, and university dissertation outlines, and we have chosen to limit them for definition and inform researchers of them.
Here we have tried to trace Arab intellectual production on this subject in its various contexts. We also made every effort to track the intellectual production published electronically on the Internet, and we linked the printed copies of the intellectual production that were limited to their electronic copies available on the Internet whenever this was available.
The bibliography was divided into precise thematic divisions, and divisions branching from each other were used when necessary. The materials were arranged under thematic divisions according to the names of the authors, and by titles for articles that do not have an explicit author
The intellectual production of Professor Dr. Heshmat Qasim: bibliography
No full textتهدف هذه الوراقية إلى إعلام الباحثين في مجال المكتبات وعلم المعلومات، والاختصاصيين في هذا المجال، بالإنتاج الفكري لأستاذنا الأستاذ الدكتور حشمت قاسم، وذلك بمناسبة بلوغه (بارك الله في عمره) السبعين في مارس ال قادم 2013 م (الموافق ربيع الثاني 1434 ه) إن شاء الله تعالى.
وتتناول الوراقية جميع مجالات تخصص المكتبات وعلم المعلومات، وما يدور في فلك هذا التخصص، مؤلفا ومترجما، باللغات العربية والإنجليزية والألمانية، وفي جميع أنماط الإنتاج الفكري، وذلك عبر سبعة وثلاثين عاما، من عام 1966 م حتى منتصف عام 2012 م. وتم تنظيم الوراقية بحسب أنماط الإنتاج الفكري، ثم زمنيا تحت كل نمط - وذلك للتعرف على التطور الزمني لأفكار الرجل، ثم هجائيا بعناوين مواد الإنتاج الفكري. كما قدمنا عن تلك المواد محل الحصر، البيانات الوراقية اللازمة للتعرف عليها في مظانها الأصلي، إضافة إلى الروابط الفائقة بالنسبة للمتاح من تلك المصادر على الخط المباشر.
وقد اعتمدنا في إعداد الوراقية على عديد من المصادر، يأتي على رأسها السيرة الذاتية للرجل التي تشتمل على إنتاجه الفكري والتي تفضل سعادته بإرسالها إلينا عبر البريد الإلكتروني، والأدلة الوراقية التي توفر عليها الأستاذ الدكتور محمد فتحي عبدالهادي (والتي تحصر الإنتاج الفكري في المجال من بداية صدوره حتى عام 2009)، وفهرس مكتبة الملك فهد الوطنية المتاح على الإنترنت، ومرصد بيانات "إديو سيرش EduSearch الذي تتوفر عليه دار المنظومة، هذا فضلا عن الاطلاع المباشر للإنتاج الفكري. بالرغم من ذلك، فإننا نود الإشارة إلى أن هناك بعض الإنتاج الفكري المنشور للرجل لم نستطع التوصل إليه، كما أن هناك الكثير مما لم يوثق من الإنتاج الفكري للرجل، وذلك مثل كثير من الاستشارات والتقارير العلمية، والمحاضرات، والتسجيلات السمعية والبصرية، وتقارير التحكيم،... إلخ. ولعل هذا الإنتاج، أو الإشارات الوراقية إليه، فيما عدا تقارير التحكيم السرية بطبيعتها، يخرج إلى النور في يوم من الأيام.
وبعد، فإننا نقدم هذه الوراقية بين أيدي الباحثين والاختصاصيين وجميع المهتمين بمجال المكتبات والمعلومات في العالم العربي، والتي تعبر عن الصورة الفكرية لقسم مهم من الإنتاج الفكري في علم المعلومات في العالم العربي؛ إن لم يكن – وفقًا لما يحمله من تأثير – أكثرها أهمية. كما تعد هذه الوراقية انعكاسًا للعطاء الفكري لأحد رجالات هذه الأمة المعطاءة، وتمثل الحياة الفكرية لهذا الرجل الذي وهب حياته جّلها – أمد الله في عمره – للعلم والمعلومات؛ بل إنه يعد لا ريب – وفقًا لجهاده الفكري والعلمي المعلوم للجميع – أبدًا لعلم المعلومات في العالم العربي.Intellectual Production This bibliography aims to inform researchers in the field of libraries and information science, and specialists in this field, about the intellectual production of our professor, Professor Dr. Heshmat Qasim, on the occasion of his (may God bless his age) reaching seventy in the coming March 2013 AD (corresponding to Rabi’ al-Thani 1434 AH).
The bibliography deals with all areas of library and information science specialization, and what goes on within the scope of this specialization, as an author and translator, in the Arabic, English, and German languages, and in all types of intellectual production, over a period of thirty-seven years, from 1966 AD until mid-2012 AD. The paper was organized according to the types of intellectual production, then chronologically under each type - in order to identify the chronological development of the man’s ideas, then alphabetically with the titles of the intellectual production materials. We have also provided the necessary paperwork for these materials in their original form, in addition to hyperlinks to what is available from these sources online.
In preparing the bibliography, we relied on many sources, the most important of which is the man’s CV, which includes his intellectual production, which His Excellency kindly sent to us via e-mail, and the paper evidence provided by Professor Dr. Muhammad Fathi Abdel Hadi (which restricts the intellectual production in the field from the beginning of its publication Until 2009), the catalog of the King Fahd National Library available on the Internet, and the “EduSearch” data observatory that Dar Al-Mandhumah has, in addition to direct access to intellectual production. Despite this, we would like to point out that there is some published intellectual production by the man who has not We are able to reach it, and there is much of the man’s intellectual production that has not been documented, such as many consultations, scientific reports, lectures, audio-visual recordings, arbitration reports, etc. Perhaps this production, or paper references to it, are excluding reports Arbitration, which is secret by nature, will come to light one day.
After that, we present this bibliography to the hands of researchers, specialists, and all those interested in the field of libraries and information in the Arab world, which expresses the intellectual image of an important section of intellectual production in information science in the Arab world. If not - by its influence - the most important. This paper is also a reflection of the intellectual giving of one of the men of this generous nation, and it represents the intellectual life of this man who devoted most of his life - may God extend his life - to knowledge and information. Indeed, he is undoubtedly considered - according to his intellectual and scientific effort known to everyone - to be the pioneer of information science in the Arab world. Dr. Heshmat Qasim said: Waraki
Morphological and Immunohistochemical Study on the Testis of Brown-Banded Bamboo Shark (Chiloscyllium punctatum)
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