Omar Al-Mukhtar University Journals
Not a member yet
747 research outputs found
Sort by
Evaluation of Stability constant of Binary complex of Tannic Acid with Fe(II) in Aqueous Solution: Potentiometric Study
Get PDFIn this study, the protonation equilibria of the tannic acid was determined and used for determining the stability constants of the binary complexes formed with iron (II) ions in the aqueous medium under the experimental conditions by potentiometric method using Irving and Rossotti equation, where Stability constant was 3.205 for Fe(II)–tannic acid complex, while Fe(II) was formed complexes with tannic acid of various stoichiometries, which in the 1:1 molar ratio at pH = 11.24. Furthermore, the ionic strength and the influence of temperature on the stability of the complexes is investigated, where stability constant in presence 0.1 M NaCl (ionic strength) of binary iron-Tan complex equal 3.254, and at different temperatures were log K1= 3.156 at 298.15 K, log K1 = 3.205 at 310.15 K, and log K1 = 3.256 at 313.15 K
A preliminary recording of insects on the island of Farwa Northwest of Libya
Get PDFThe study aimed to present the first record of insect families in Farwa Island. Farwa Island is the largest and most important island in Libya; located in Northern west part of Libya in the Mediterranean, its insect fauna is poorly studied. Short time intensive collection of insect samples was conducted in four areas (mouth of the valley, bay of containers, center of the Island, and Ras-Attalgha) in February, March and April 2021. Different methods were used for insect collection, sorting, preservation and later identification to the lowest taxonomic level and verification. 9 orders, 31 families, 40 genera and 58 insect species were collected in the study; the center of the Island had the highest numerical density and diversity of insect fauna due to its diverse vegetation compared to other areas. Diverse suitable habitats and absent insect control measures provided suitable environmental conditions for insects breeding, feeding and hiding from enemies. This study constitutes the first comprehensive survey of insect fauna on Farwa Island and adds significant value to the ongoing assessment of insect diversity in Libya. A long-term study has to be conducted to investigate detailed information about the abundance and diversity of insects and other arthropods on Farwa Island
A computational study to compare some plastic polymers with potassium bromide using density functional theory and UV-Visible spectroscopy
Get PDFThis study presents the value of computer simulation in a comparative analysis of some of the most common polymers (polyamide, polyethylene, and polycarbonate) used in the plastics industry. The introduction of density functional theory (DFT) has greatly facilitated the application of computational science to these materials, in addition to the calculation of UV-visible spectra. The objective of this study was to ascertain the potential of these calculations to elucidate and compare polymers when mixed with a potassium bromide promoter. The most favorable result was observed for polyethylene, where the highest internal energy was 3812.125698 Hartree and the lowest polar moment was 8.417560 Debye. This resulted in a reduction of the total charge between the potassium bromide complex and polyethylene. Additionally, the highest UV absorbance was 800.00 nm, thus making it the safest of the remaining polymers. This provides assurance that when used as a carrier for any baked goods where potassium bromide has been used as a strengthening agent, it is the optimal choice
Legal Means of Resolving Disputes Between Heirs, An Applied Study of the Principle of Separation
Get PDFيُعد التخارج أحد أهم الوسائل في فض النزاعات المتوقعة بين الورثة بالتراضي، فهو والتصالح معنيان لمسمَّى واحد في باب الميراث. وقد أقرَّ الشرع الصلح القائم على مبدأ التراضي المتفق مع أصوله في الحلال والحرام، وتأتي هذه الدراسة لتبين كيف كان لهذا المبدأ الأثر البالغ في فض النزاعات وحل الخصومات بين الورثة من خلال مسائل تطبيقية واقعية صدرت فيها أحكام قضائية من المحكمة العليا.
The principle of Exclusion is one of the most important means of resolving expected disputes between inheritors by mutual consent, as this principle and reconciliation have the same meaning in the matter of inheritance. Sharia has approved reconciliation based on the principle of mutual consent that is consistent with its principles regarding what is permissible and what is forbidden. This study comes to show how this principle had a significant impact in resolving disputes and resolving disputes between heirs through realistic applied issues in which judicial rulings were issued by the Supreme Court
The Legal System of the Annulment of Arbitral Award a Comparative and Analytical Study
Get PDFيبرز التحكيم كوسيلة مفضلة لفض المنازعات بسبب ما يتميز به من سرعة، وقلة النفقات، وتحقيق السرية، واستمرار العلاقة بين الأطراف، والابتعاد عن قيود القضاء وإجراءاته المعقدة. وهذا لا يعني ترك الخصومة وما يترتب عليها من حكم لهيئة التحكيم واستبعاد القضاء. فإجراءات التحكيم قد يشوبها عيوب أو أخطاء بسبب المحكمين مما يترتب عليه صدور حكم معيب، الأمر الذي يوجب وجود سلطة تختص بإعادة الأمور إلى نصابها. فكان لزاماً إخضاع حكم التحكيم لرقابة القضاء للتأكد من صدوره صحيحاً. وهذه الرقابة تتمثل في جانب منها في دعوى البطلان، وهي موضوع هذا البحث.Arbitration is highlighted as a preferred method for dispute resolution due to its speed, low costs, confidentiality, the continuation of relationships between parties, avoiding the constraints and complex procedures of the judiciary. This does not mean neglecting disputes and the resulting arbitral awards, nor excluding judicial review. Arbitration procedures may be flawed or erroneous due to the arbitrators, leading to a defective award, necessitating an authority to restore order. Therefore, it is essential to subject the arbitral award to judicial review to ensure its correctness. This review is partially embodied in the annulment lawsuit, which is the subject of this paper
High-Density Polyethylene/Kaolin Clay Composites: Optimization of The In-jection Moulding Process Parameters Towards Minimum Shrinkage and Warpage
Get PDFOptimization of the injection moulding process parameters of thermoplastic composites made of high-density polyethylene (HDPE) and kaolin clay (KC) was carried out using the Taguchi method. The parameters that were taken into consideration were melting temperature, packing pressure and packing time. Composites containing 98 wt% of HDPE and 2wt% of KC with various particle sizes of <75, 75-106 and 106-150 µm were used. Two defects that are usually associated with the injection moulding process of polymers were selected, namely shrinkage and warpage. Results showed that the optimal parameters needed to obtain a minimum shrinkage value for composites containing clay (regardless of its particle size) are very similar to those for the pure HDPE. Contrary, the optimal parameters needed to obtain a minimum warpage value depends on the size of clay particles added, which were also different from those of the pure HDPE. Results also revealed that the most effective parameter (both shrinkage and warpage) for pure HDPE and its composites with clay was the melting temperature. 
A survivable Point-to-Point (PTP) Wireless Transmission Based On Adaptive Coding and Modulation (ACM) Technique
Get PDFWireless transmission can be affected by severe weather conditions such as heavy rain. Such a temporary weather condition leads to decrease the received power and thus reduce the signal-to-noise ratio, which degrades the overall performance. In some cases, in which a high bit rate is being transmitted where a specific amount of signal-to-noise ratio is required, the wireless transmission drops down completely. Adaptive Coding and Modulation technique could provide the feature of adaptation during transmission. In Adaptive Coding and Modulation, transmission parameters such as modulation scheme and/ or code rate can be altered based on signal-to-noise ratio measurements. In this paper, a survivable point-to-point wireless transmission was established using Adaptive Coding and Modulation technology. A concentration on the Adaptive Modulation was made in this work by using the AF-11FX equipment which is capable of modulate carriers using different modulation schemes (QPSK, 16QAM, 64QAM, 256QAM, and 1024QAM). In this context, the wireless point-to-point link was examined with and without the use of Adaptive Modulation. A survivable transmission was achieved in which an automatic switching mechanism is performed among the aforementioned modulation schemes based on signal-to-noise ratio measurements, which led to increase the average transmission rate
DEVELOPMENT OF DRAG COEFFICIENT CORRELATIONS FOR CIRCULAR CYLINDER USING SYMBOLIC REGRESSION
No full textThe current paper provides a symbolic regression-based correlation for the drag coefficient for circular cylinder. The correlation is intended to be applicable over a wide range of flow regimes namely that range from the creeping flow regime up to the turbulent flow regime. Demo version of TuringBot symbolic regression software was used to develop different correlations using different sets of data. Experimental set of data was used in one run whereas steady numerical results for Reynolds number up to ~ 25 were used in generating a second set of formulas. In a different run data generated using Sucker and Brauwer (Wärme-und Stoffübertragung, 1975. 8: p. 149-158) correlation with uniform distribution in each order of magnitude was used to obtain a different set of correlations. The data was generated across five orders of magnitude of change of Re. Among all suggested formulas in the three cases, four correlations are considered for their simplicity and accuracy. The predictions of the correlations ranged from reasonably good to very good as compared to existing data and correlations. The relative error of the four developed correlations ranged between 9% and 16% when compared to experimental data for Reynolds numbers ranging from 1-105. In particular, one correlations was able to capture all the qualitative and quantitative changes in the drag coefficient over the different flow regimes for 0.15 < Re < 105. The relative error of this correlation was comparable to Sucker and Brauwer correlation
The Implicatures Analysis of Translating English Medical Prescriptions into Arabic: Pragma-Semantic Analysis
Get PDFتوفر اللغتان الإنجليزية والعربية، مثل جميع اللغات الطبيعية الأخرى، لمتحدثيها مجموعة رائعة من التعبيرات المرجعية التي يمكنهم الاختيار من بينها لاتصالاتهم وتفاعلاتهم اليومية. تتناول هذه الدراسة مبدأ غرايس التعاوني في ترجمة الوصفات الطبية الإنجليزية إلى اللغة العربية. وتمت المقارنة بين الوصفات الطبية الإنجليزية وترجماتها العربية. لتحقيق تحليل متسق للبيانات، استخدمت الدراسة الوصفات الطبية التي صممتها شركات مختلفة تحت مصطلح طبي يسمى التأثير الجانبي (التأثير السلبي). يوضح البحث كيفية تحديد المبادئ المتضمنة في ملصق الدواء الموصوف لكلا اللغتين. علاوة على ذلك، يبحث البحث فيما إذا كان النص العربي يحمل أقوالًا متشابهة في اللغة الإنجليزية تحمل رسائل مماثلة كما في الوصفة الطبية الإنجليزية الأصلية. بشكل عام، تكشف الدراسة أن الوصفة الطبية الإنجليزية المترجمة ونسختها العربية تتبع معظم مبادئ غرايس، كما أن النسخة العربية تحمل رسالة مماثلة للوصفة الطبية الإنجليزية.English and Arabic languages, like all other natural languages, provide their speakers with an impressive array of referring expressions from which they can choose for their daily communications and interactions. This study examines Grice‘s cooperative principle in Translating English Medical prescriptions into Arabic. The comparison was made between the English medical prescriptions and their Arabic translations. To achieve consistent data analysis, the study used Medical Prescriptions designed by different companies under a medical term called Side Effect (Adverse Effect). The research demonstrates how the Implicature Maxims are identified in the prescription medicine label for both languages. Moreover, the research investigates whether Arabic text conveys similar Maxims in English carrying similar messages as in the original Medical English prescription. Generally, the study reveals that the Translated English Medical prescription and its Arabic version follow most of Grice’s maxims and the Arabic version conveys a similar message as the English prescription. 
The dialectical relationship between tyranny, chaos and freedom
No full textهذه الدراسة تهدف إلى تحديد مفهوم العلاقة بين السلطة وممارسة الحرية بهدف إلقاء الضوء على التحولات التي قد تحدث في طابع السلطة، مما يؤدي في بعض الأحيان إلى التحول إلى نظم دكتاتورية. وفي سياق متكامل، تسعى الدراسة أيضًا إلى فهم كيف يمكن لممارسة الحرية أن تتجاوز حدودها المناسبة، مما يمكن أن ينجم عنها حالات من الفوضى وعدم الاستقرار. يتعمق هذا البحث في فهم الديناميات التي تحدث عندما تتداخل السلطة والحرية، محددًا المراحل التي يمكن أن تؤدي إلى تحولات غير مرغوب فيها في النظام الاجتماعي.This study aims to elucidate the concept of the relationship between authority and the exercise of freedom, shedding light on the transformations that may occur in the nature of authority, sometimes leading to a shift towards dictatorial systems. In a comprehensive context, the study also seeks to understand how the exercise of freedom can surpass appropriate boundaries, potentially resulting in situations of chaos and instability. This research delves into comprehending the dynamics that unfold when authority and freedom intersect, specifying the stages that can lead to undesirable transformations in the social order