Pub Date : 2023-02-21DOI: 10.51984/jopas.v22i1.2339
Adel Issa Ben Issa, Salem Alarabi Shufat, Jamal Mohamed Ahmed, Hasan Abunouara
Various applications of the piezoelectric energy in the modern world require an efficient AC-DC low power converter. As the two stages converter with bridge rectifiers may not be used because the diodes would not be suitable for low volt ranging between 100 to 200mv, these are considered an efficient element in the low volt circuits because of their entire losses. In this paper, a small and efficient AC-DC low power converter is presented. It directly converts low AC voltage to the required output DC voltage using one stage instead of bridge rectification. The proposed converter combines both boost and buck boost converters which are parallel constructed to condition the positive and negative half cycle of the input AC volt respectively. Two inductors and one capacitor are used for booth circuits in terms of reducing the size. The circuit is tested at 50 kHz switching frequency with two different duty cycles to rectify a 0.5 AC volt to about 3 DC volts with an estimated efficiency of 65%. The simulation result was 3.7 DC V from 0.5 ACV. The circuit analysis and the design guide line are explained. The circuit is designed and tested using Matlab (Simulink) software.
现代世界中压电能量的各种应用都需要一种高效的交流-直流低功率转换器。由于带桥式整流器的两级变换器可能不被使用，因为二极管不适用于100到200mv之间的低压范围，由于它们的全部损耗，这些被认为是低压电路中的有效元件。本文介绍了一种小型、高效、低功率的交直流变换器。它直接将低交流电压转换为所需的输出直流电压，使用一级而不是桥式整流。该变换器结合了升压变换器和降压变换器，它们是并联构造的，分别调节输入交流电压的正半周和负半周。为了减小尺寸，展台电路采用了两个电感器和一个电容。该电路在50 kHz开关频率下进行测试，具有两个不同的占空比，以校正0.5交流伏到约3直流伏，估计效率为65%。仿真结果从0.5 ACV变为3.7 DC V。给出了电路分析和设计思路。利用Matlab (Simulink)软件对电路进行了设计和测试。
{"title":"A bridgeless AC-DC step up regulator circuit for piezoelectric energy harvester","authors":"Adel Issa Ben Issa, Salem Alarabi Shufat, Jamal Mohamed Ahmed, Hasan Abunouara","doi":"10.51984/jopas.v22i1.2339","DOIUrl":"https://doi.org/10.51984/jopas.v22i1.2339","url":null,"abstract":"Various applications of the piezoelectric energy in the modern world require an efficient AC-DC low power converter. As the two stages converter with bridge rectifiers may not be used because the diodes would not be suitable for low volt ranging between 100 to 200mv, these are considered an efficient element in the low volt circuits because of their entire losses. In this paper, a small and efficient AC-DC low power converter is presented. It directly converts low AC voltage to the required output DC voltage using one stage instead of bridge rectification. The proposed converter combines both boost and buck boost converters which are parallel constructed to condition the positive and negative half cycle of the input AC volt respectively. Two inductors and one capacitor are used for booth circuits in terms of reducing the size. The circuit is tested at 50 kHz switching frequency with two different duty cycles to rectify a 0.5 AC volt to about 3 DC volts with an estimated efficiency of 65%. The simulation result was 3.7 DC V from 0.5 ACV. The circuit analysis and the design guide line are explained. The circuit is designed and tested using Matlab (Simulink) software.","PeriodicalId":16911,"journal":{"name":"Journal of Pure & Applied Sciences","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87678735","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-13DOI: 10.51984/jopas.v22i1.1798
A. H. A. Omar, Iman Aissa Alghannay Ahmed
In this work, the predator-prey model with the ratio-dependent functional response is considered, where the randomness enters into the equations only through their initial conditions. It is done by assuming normal distribution as the initial states of the model to treat the randomness. The passage from the deterministic situation to the random one for these equations is also the most transparent. In addition, a numerical simulation will be offered using the modified approach founded on the fifth-order improved Runge-Kutta method. Furthermore, the stability of the equilibrium points, and certain statistical properties related to the random behaviour of predators and their prey, will be analyzed and discussed.
{"title":"The Ratio Predator-Prey Model with Random Initial Conditions","authors":"A. H. A. Omar, Iman Aissa Alghannay Ahmed","doi":"10.51984/jopas.v22i1.1798","DOIUrl":"https://doi.org/10.51984/jopas.v22i1.1798","url":null,"abstract":"In this work, the predator-prey model with the ratio-dependent functional response is considered, where the randomness enters into the equations only through their initial conditions. It is done by assuming normal distribution as the initial states of the model to treat the randomness. The passage from the deterministic situation to the random one for these equations is also the most transparent. In addition, a numerical simulation will be offered using the modified approach founded on the fifth-order improved Runge-Kutta method. Furthermore, the stability of the equilibrium points, and certain statistical properties related to the random behaviour of predators and their prey, will be analyzed and discussed.","PeriodicalId":16911,"journal":{"name":"Journal of Pure & Applied Sciences","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78814008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-02-09DOI: 10.51984/jopas.v22i1.2412
فرج فرحات الضبيع
تُرَكز هذه الورقة على التحقق من تأثير مناولة المواد على عوامل الأداء في المؤسسات الخدمية الليبية. الهدف الرئيسي من هذه الورقة هو التأكد من تأثيرات مناولة المواد داخل ميناء الخمس البحري من أجل تحقيق أداء أفضل وكفاءة عالية، وخفضاً للتكاليف. سيتم في هذه الورقة استخدام المنهج الوصفي التحليلي، حيث توضح النتائج المتحصل عليها بأن عامل دور إدارة مناولة المواد في تقليل كافة المصاريف داخل الميناء المستهدف يعتبر العامل الأكثر أهمية من بين كافة العوامل التي تمت دراستها. كذلك يوجد ارتباط موجب قوي بين مناولة المواد وعوامل أداء المؤسسة، باعتبار أن مناولة المواد تُقَلل من تكاليف المناولة ومن المخاطر ، وكذلك من الزمن الغير مُسْتَغَل للعمالة. بناءً على هذه النتائج، يتم اقتراح أعمال بحثية مستقبلية لتحسين عمليات مناولة المواد وكذلك القرارات الفعالة داخل المنظمة باستخدام نماذج المحاكاة.
{"title":"التحقق من تأثير عوامل مناولة المواد على مستويات الأداء في المؤسسات الخدمية الليبية- دراسة حالة","authors":"فرج فرحات الضبيع","doi":"10.51984/jopas.v22i1.2412","DOIUrl":"https://doi.org/10.51984/jopas.v22i1.2412","url":null,"abstract":"تُرَكز هذه الورقة على التحقق من تأثير مناولة المواد على عوامل الأداء في المؤسسات الخدمية الليبية. الهدف الرئيسي من هذه الورقة هو التأكد من تأثيرات مناولة المواد داخل ميناء الخمس البحري من أجل تحقيق أداء أفضل وكفاءة عالية، وخفضاً للتكاليف. سيتم في هذه الورقة استخدام المنهج الوصفي التحليلي، حيث توضح النتائج المتحصل عليها بأن عامل دور إدارة مناولة المواد في تقليل كافة المصاريف داخل الميناء المستهدف يعتبر العامل الأكثر أهمية من بين كافة العوامل التي تمت دراستها. كذلك يوجد ارتباط موجب قوي بين مناولة المواد وعوامل أداء المؤسسة، باعتبار أن مناولة المواد تُقَلل من تكاليف المناولة ومن المخاطر ، وكذلك من الزمن الغير مُسْتَغَل للعمالة. بناءً على هذه النتائج، يتم اقتراح أعمال بحثية مستقبلية لتحسين عمليات مناولة المواد وكذلك القرارات الفعالة داخل المنظمة باستخدام نماذج المحاكاة.","PeriodicalId":16911,"journal":{"name":"Journal of Pure & Applied Sciences","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80759525","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-30DOI: 10.51984/jopas.v21i2.2165
Hamdi Abdulhamid Raghs
In this study, it was investigated whether the load strength of bio plastic (PLA) specimens produced in a three-dimensional printer can be increased by applying the temperature and dwell time variables were applied, by performing 9 different experiments. ASTM D638 standard procedure is adopted for evaluating the tensile behaviour of 3D-printed PLA test specimens. It was examined whether there was a change in the material structure and interpretation was made according to the results. Experimental studies primarily started with the production of samples with a 3D printer. In the first three samples, the temperature was kept constant at 100 ℃, then the fourth, fifth and sixth samples were kept under 150°C, The last three samples were kept at 200°C, and the waiting times were adjusted to 25, 50, and 75 minutes, respectively, for samples. Test samples 7, 8 and 9 could not withstand the high temperature, so the tensile test could be performed up to the number 6 sample. In order to investigate the changes in the heat treated samples, the tensile test was applied to the untreated sample and the remaining 6 samples. After testing the samples, yield strength, tensile strength, maximum tensile and modulus of elasticity values were compared. As a result of the test, positive results were observed in yield strength when the untreated sample was compared with the heat treated samples, which shows that the heat treatment has a positive effect on the samples, and also the effect of heat treatment led to an increase elasticity modulus, As per the effect on the bio plastic surface according to the graphs, the specimen roughness was found to vary depending on the temperature because temperature affects in surface roughness. In our attempts, investigations will have performed by Optical microscope analysis, Surface Roughness Measurement, and tensile testing and this will help us to explain properties of the samples and changes likely to occur in the course of the experiments. The aim of this research is improve the mechanical properties of bio plastic by thermal treatment.
{"title":"Study The Effect Of Thermal Treatment On The Mechanical Properties Of Bioplastic Produced By 3d Printer","authors":"Hamdi Abdulhamid Raghs","doi":"10.51984/jopas.v21i2.2165","DOIUrl":"https://doi.org/10.51984/jopas.v21i2.2165","url":null,"abstract":"In this study, it was investigated whether the load strength of bio plastic (PLA) specimens produced in a three-dimensional printer can be increased by applying the temperature and dwell time variables were applied, by performing 9 different experiments. ASTM D638 standard procedure is adopted for evaluating the tensile behaviour of 3D-printed PLA test specimens. It was examined whether there was a change in the material structure and interpretation was made according to the results. Experimental studies primarily started with the production of samples with a 3D printer. In the first three samples, the temperature was kept constant at 100 ℃, then the fourth, fifth and sixth samples were kept under 150°C, The last three samples were kept at 200°C, and the waiting times were adjusted to 25, 50, and 75 minutes, respectively, for samples. Test samples 7, 8 and 9 could not withstand the high temperature, so the tensile test could be performed up to the number 6 sample. In order to investigate the changes in the heat treated samples, the tensile test was applied to the untreated sample and the remaining 6 samples. After testing the samples, yield strength, tensile strength, maximum tensile and modulus of elasticity values were compared. As a result of the test, positive results were observed in yield strength when the untreated sample was compared with the heat treated samples, which shows that the heat treatment has a positive effect on the samples, and also the effect of heat treatment led to an increase elasticity modulus, As per the effect on the bio plastic surface according to the graphs, the specimen roughness was found to vary depending on the temperature because temperature affects in surface roughness. In our attempts, investigations will have performed by Optical microscope analysis, Surface Roughness Measurement, and tensile testing and this will help us to explain properties of the samples and changes likely to occur in the course of the experiments. The aim of this research is improve the mechanical properties of bio plastic by thermal treatment.","PeriodicalId":16911,"journal":{"name":"Journal of Pure & Applied Sciences","volume":"73 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87083535","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-30DOI: 10.51984/jopas.v21i2.2201
خميس محمد خميس الحمري, زيدان ضو الغناي علي
تهدف هذه الدراسة إلى معرفة تأثير النمط القيادي السائد لدى رؤساء الاقسام العلمية على الرضا الوظيفي لأعضاء هيئة التدريس بجامعة سبها. وللتحقق من ذلك اتبع الباحثان المنهج الوصفي التحليلي، واعتمدت الدراسة على الاستبانة كأداة لجمع البيانات، وتمثلت عينة الدراسة في (87) عضو هيئة تدريس من أعضاء هيئة التدريس في جامعة سبها، ومن أهم النتائج التي توصلت اليها الدراسة هي وجود فروق ظاهرية في المتوسطات الحسابية لمجالات الدراسة تعزى إلى الاختلاف في النمط القيادي الممارس من رؤساء الأقسام العلمية في جامعة سبها، حيث جاء في اولها بالمرتبة الأولى مجال النمط القيادي الديمقراطي، يليه مجال النمط القيادي الحر، وجاء في المرتبة الأخيرة مجال النمط القيادي التسلطي. كما اظهرت النتائج أن مستوى الرضا الوظيفي لدى اعضاء هيئة التدريس في جامعة سبها بشكل عام كان بمستوى متوسط. وخلصت الدراسة إلى عدد من التوصيات أهمها زيادة مستوي الرضا الوظيفي لدي اعضاء هيئة التدريس من خلال إدارك المسؤولين في الجامعة ورؤساء الاقسام العلمية بضرورة ايجاد نمط قيادي ملائم لهم.
{"title":"تأثير النمط القيادي السائد لرؤساء الأقسام العلمية على الرضا الوظيفي لدى أعضاء هيئة التدريس بجامعة سبها","authors":"خميس محمد خميس الحمري, زيدان ضو الغناي علي","doi":"10.51984/jopas.v21i2.2201","DOIUrl":"https://doi.org/10.51984/jopas.v21i2.2201","url":null,"abstract":"تهدف هذه الدراسة إلى معرفة تأثير النمط القيادي السائد لدى رؤساء الاقسام العلمية على الرضا الوظيفي لأعضاء هيئة التدريس بجامعة سبها. وللتحقق من ذلك اتبع الباحثان المنهج الوصفي التحليلي، واعتمدت الدراسة على الاستبانة كأداة لجمع البيانات، وتمثلت عينة الدراسة في (87) عضو هيئة تدريس من أعضاء هيئة التدريس في جامعة سبها، ومن أهم النتائج التي توصلت اليها الدراسة هي وجود فروق ظاهرية في المتوسطات الحسابية لمجالات الدراسة تعزى إلى الاختلاف في النمط القيادي الممارس من رؤساء الأقسام العلمية في جامعة سبها، حيث جاء في اولها بالمرتبة الأولى مجال النمط القيادي الديمقراطي، يليه مجال النمط القيادي الحر، وجاء في المرتبة الأخيرة مجال النمط القيادي التسلطي. كما اظهرت النتائج أن مستوى الرضا الوظيفي لدى اعضاء هيئة التدريس في جامعة سبها بشكل عام كان بمستوى متوسط. وخلصت الدراسة إلى عدد من التوصيات أهمها زيادة مستوي الرضا الوظيفي لدي اعضاء هيئة التدريس من خلال إدارك المسؤولين في الجامعة ورؤساء الاقسام العلمية بضرورة ايجاد نمط قيادي ملائم لهم.","PeriodicalId":16911,"journal":{"name":"Journal of Pure & Applied Sciences","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87509147","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-30DOI: 10.51984/jopas.v21i2.2090
N. Ahmida, Naema A. Abdeljalil, Intisar A. Elshara, Abdulsalam A. Benkhayal, M. Ahmida
Milk is an important food; it supplies our body with the essential mineral’s requirements. In this study, some major (Calcium, magnesium, phosphorus) and minor (copper, iron, zinc) essential minerals were determined in seventy-eight random processed milk samples. These samples were collected from different markets in Benghazi city, Libya during 2017. The order of major essential elements concentrations in all milk samples was calcium> phosphorous> magnesium. The mean concentrations of calcium were recorded at 4262 ±2771mg/kg, 5006 ±896mg/kg, 1276 ±319mg/kg and 1231 ±154mg/kg, while mean concentrations of magnesium were 560.1 ±82mg/kg, 419.4 ±153mg/kg, 249 ±7.1mg/kg, 127.7 ±21mg/kg, in powdered, infant formula, evaporated and sterilized milk samples, respectively. Phosphorus concentration varied between 3322-7692mg/kg, 2622-5490mg/kg, 1381-4720mg/kg and 1049-2326mg/kg in powdered, infant formula, evaporated and sterilized milk, respectively. The contents of trace essential minerals, included copper, iron and zinc, were detected in all collected samples. The highest copper content was recorded in powder milk, with a mean concentration 2.13 ±0.84mg/kg, followed by infant formula products, with mean concentration 1.15±0.95mg/kg. The mean concentrations of zinc and iron in milk powder products were detected at 33.48 ±17.4mg/kg and 27.60mg/kg, respectively. The concentration of minor element in evaporated and sterilized milk samples were in concentration lower than 1mg/kg, except zinc in evaporated milk, which varied between 2.80-5.77mg/kg. The contents of essential minerals were agreed with some values that recorded in published results, for same products of processed milk.
{"title":"The Contents of Some Essential Major and Trace Elements in Various Types of Processed Milk Products Collected from Benghazi Markets","authors":"N. Ahmida, Naema A. Abdeljalil, Intisar A. Elshara, Abdulsalam A. Benkhayal, M. Ahmida","doi":"10.51984/jopas.v21i2.2090","DOIUrl":"https://doi.org/10.51984/jopas.v21i2.2090","url":null,"abstract":"Milk is an important food; it supplies our body with the essential mineral’s requirements. In this study, some major (Calcium, magnesium, phosphorus) and minor (copper, iron, zinc) essential minerals were determined in seventy-eight random processed milk samples. These samples were collected from different markets in Benghazi city, Libya during 2017. The order of major essential elements concentrations in all milk samples was calcium> phosphorous> magnesium. The mean concentrations of calcium were recorded at 4262 ±2771mg/kg, 5006 ±896mg/kg, 1276 ±319mg/kg and 1231 ±154mg/kg, while mean concentrations of magnesium were 560.1 ±82mg/kg, 419.4 ±153mg/kg, 249 ±7.1mg/kg, 127.7 ±21mg/kg, in powdered, infant formula, evaporated and sterilized milk samples, respectively. Phosphorus concentration varied between 3322-7692mg/kg, 2622-5490mg/kg, 1381-4720mg/kg and 1049-2326mg/kg in powdered, infant formula, evaporated and sterilized milk, respectively. The contents of trace essential minerals, included copper, iron and zinc, were detected in all collected samples. The highest copper content was recorded in powder milk, with a mean concentration 2.13 ±0.84mg/kg, followed by infant formula products, with mean concentration 1.15±0.95mg/kg. The mean concentrations of zinc and iron in milk powder products were detected at 33.48 ±17.4mg/kg and 27.60mg/kg, respectively. The concentration of minor element in evaporated and sterilized milk samples were in concentration lower than 1mg/kg, except zinc in evaporated milk, which varied between 2.80-5.77mg/kg. The contents of essential minerals were agreed with some values that recorded in published results, for same products of processed milk.","PeriodicalId":16911,"journal":{"name":"Journal of Pure & Applied Sciences","volume":"48 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75069821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-30DOI: 10.51984/jopas.v21i2.2264
بشير مصباح خليفة النعاس, محمـــد الولي عبد القادر الشـريف, منصـــور بن مســــكين
طرابلس هي عاصمة ليبيا وأكبر مدنها ويبلغ سكانها حوالي ثلاثة ملايين نسمة تقريبا أي ما يعادل نصف سكان ليبيا وأصبحت المدينة في العقود الأخيرة وجهة الليبيين وتعج بالسكان من كافة أنحاء البلاد، وهذا الوضع إنعكس بالطبع علي الزيادة في حركة المرور في المدينة بشكل عام وعلي مركزها بشكل خاص. وعليه فإن دراستنا تتركز علي منطقة (الظهرة-زاوية الدهماني) لكونها جزء هام وكبير من مركز المدينة ذات الكثافة العالية في عدد السكان وزيادة في ملكية السيارات ومن مشاهد هذا الإزدحام قضاء المواطنين ساعات طويلة في الطريق قبل الوصول إلي أماكنهم عند المرور علي هذه المنطقة والتي أصبحت بذلك (الظهرة-زاوية الدهماني) تحت ضغط مروري كبير والذي أدى الي ظهور ظاهرة الإزدحام المروري وعدم قدرة الطرق ومواقف السيارات القائمة بمنطقة الدراسة لاستيعاب هذا الزخم المروري مما أجبر مالكي المركبات مثلا علي ركن سياراتهم على جانبي الشوارع الرئيسية والفرعية من الداخل وبالقرب من التقاطعات والمنعطفات، وغيرها من الشواهد الأخري المتعلقة بظاهرة الإزدحام المروري, هذه الورقة اقترحت إستخدام محطات الإنتظار الذكية كأحد الحلول لهذه الظاهرة . وفي النهاية ختمت الورقة بخلاصة رسمت بعض التوصيات التي لا محالة ستكون محط اهتمام لكل من له علاقة بهذا الموضوع.
{"title":"محطات الإنتظار الذكية لحل ظاهرة الإزدحام المروري منطقة الدراسة: (الظهرة – زاوية الدهمائي) بطرابلس ليبيا","authors":"بشير مصباح خليفة النعاس, محمـــد الولي عبد القادر الشـريف, منصـــور بن مســــكين","doi":"10.51984/jopas.v21i2.2264","DOIUrl":"https://doi.org/10.51984/jopas.v21i2.2264","url":null,"abstract":"طرابلس هي عاصمة ليبيا وأكبر مدنها ويبلغ سكانها حوالي ثلاثة ملايين نسمة تقريبا أي ما يعادل نصف سكان ليبيا وأصبحت المدينة في العقود الأخيرة وجهة الليبيين وتعج بالسكان من كافة أنحاء البلاد، وهذا الوضع إنعكس بالطبع علي الزيادة في حركة المرور في المدينة بشكل عام وعلي مركزها بشكل خاص. وعليه فإن دراستنا تتركز علي منطقة (الظهرة-زاوية الدهماني) لكونها جزء هام وكبير من مركز المدينة ذات الكثافة العالية في عدد السكان وزيادة في ملكية السيارات ومن مشاهد هذا الإزدحام قضاء المواطنين ساعات طويلة في الطريق قبل الوصول إلي أماكنهم عند المرور علي هذه المنطقة والتي أصبحت بذلك (الظهرة-زاوية الدهماني) تحت ضغط مروري كبير والذي أدى الي ظهور ظاهرة الإزدحام المروري وعدم قدرة الطرق ومواقف السيارات القائمة بمنطقة الدراسة لاستيعاب هذا الزخم المروري مما أجبر مالكي المركبات مثلا علي ركن سياراتهم على جانبي الشوارع الرئيسية والفرعية من الداخل وبالقرب من التقاطعات والمنعطفات، وغيرها من الشواهد الأخري المتعلقة بظاهرة الإزدحام المروري, هذه الورقة اقترحت إستخدام محطات الإنتظار الذكية كأحد الحلول لهذه الظاهرة . وفي النهاية ختمت الورقة بخلاصة رسمت بعض التوصيات التي لا محالة ستكون محط اهتمام لكل من له علاقة بهذا الموضوع.","PeriodicalId":16911,"journal":{"name":"Journal of Pure & Applied Sciences","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74697835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-30DOI: 10.51984/jopas.v21i2.1909
Entesar. M. A. Benrema
This study aims to know the extent to which the fruits of the “Golden Delicious” apple variety grown in Al-Wardiya farms can retain their quality during cold storage, by studying the change in some natural characteristics of the fruits that were stored in special refrigerators during the 2019 and 2020 planting seasons, and the treatments were storage for (0, 60, 120) days at a temperature of (0, 3 oC) and the results obtained showed that the longer the storage period, the lower the quality of the fruits The degree of coloration of the fruits, their starch content and their hardness decreased, and their weight loss increased with the progression of the storage period, Also, the fruits retained their quality when stored at zero degrees Celsius better than those stored at 3 degrees Celsius.
{"title":"Study of the effect of storage periods and temperatures on the quality of apple fruits, cultivar Golden Delicious","authors":"Entesar. M. A. Benrema","doi":"10.51984/jopas.v21i2.1909","DOIUrl":"https://doi.org/10.51984/jopas.v21i2.1909","url":null,"abstract":"This study aims to know the extent to which the fruits of the “Golden Delicious” apple variety grown in Al-Wardiya farms can retain their quality during cold storage, by studying the change in some natural characteristics of the fruits that were stored in special refrigerators during the 2019 and 2020 planting seasons, and the treatments were storage for (0, 60, 120) days at a temperature of (0, 3 oC) and the results obtained showed that the longer the storage period, the lower the quality of the fruits The degree of coloration of the fruits, their starch content and their hardness decreased, and their weight loss increased with the progression of the storage period, Also, the fruits retained their quality when stored at zero degrees Celsius better than those stored at 3 degrees Celsius.","PeriodicalId":16911,"journal":{"name":"Journal of Pure & Applied Sciences","volume":"75 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86318589","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-30DOI: 10.51984/jopas.v21i2.2053
Basem Ertimi, Basem Oqab
This study assesses the impact of economic sanctions on oil exports and economic growth through case studies of Libya. By setting up a synthetic group method that reproduces the oil exports and economic growth of the case study before the imposition of economic sanctions, we compare the oil exports and the economic growth of the Synthetic and the actual for each period. We address a crucial gap in the literature of sanction in a petrostate case study using the synthetic control approach. Our analysis found that both petroleum exports and economic growth were lower with economic sanctions. This research is integrated into the comparative and international landscape of international influence relations with the domestic economy. Economic sanctions, the results show, are the key driver in fluctuations in oil exports and economic growth that might be represented in the oil curse. We believe that our empirical research can contribute to domestic and international policy formation by sanctioned countries. Overall, the findings confirm that sanctions may be imposed on Libya as another channel of the resource curse from the global and foreign policy perspectives.
{"title":"The Impact of Economic Sanctions on Oil Industry: A Case Study of Libya Using the Synthetic Control Method","authors":"Basem Ertimi, Basem Oqab","doi":"10.51984/jopas.v21i2.2053","DOIUrl":"https://doi.org/10.51984/jopas.v21i2.2053","url":null,"abstract":"This study assesses the impact of economic sanctions on oil exports and economic growth through case studies of Libya. By setting up a synthetic group method that reproduces the oil exports and economic growth of the case study before the imposition of economic sanctions, we compare the oil exports and the economic growth of the Synthetic and the actual for each period. We address a crucial gap in the literature of sanction in a petrostate case study using the synthetic control approach. Our analysis found that both petroleum exports and economic growth were lower with economic sanctions. This research is integrated into the comparative and international landscape of international influence relations with the domestic economy. Economic sanctions, the results show, are the key driver in fluctuations in oil exports and economic growth that might be represented in the oil curse. We believe that our empirical research can contribute to domestic and international policy formation by sanctioned countries. Overall, the findings confirm that sanctions may be imposed on Libya as another channel of the resource curse from the global and foreign policy perspectives.","PeriodicalId":16911,"journal":{"name":"Journal of Pure & Applied Sciences","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82468960","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-20DOI: 10.51984/jopas.v21i2.2080
K. Elsherif, Ahmed Zubi, A. Najar, Hamida Bin Ghashir
A Spectrophotometric investigation was applied on the complexation of 1,3-bis (3-(2-pyridyl) pyrazol-1-ylmethyl) benzene (1,3-PPB) and 1,4-bis (3-(2-pyridyl) pyrazol-1-ylmethyl) benzene (1,4-PPB) with Zn(II) and Cd(II) ions in a mixed (1:1) solvent of water and ethanol. The mole ratio methodology was used to calculate the stoichiometry, molar absorptivity, and stability constant values. Some experimental conditions have been investigated, including pH, ionic strength, solvent composition, and time. The results revealed the production of 1:1 complexes. In terms of ligands, 1,4-PPB was more stable than 1,3-PPB, whereas Cd(II) complexes were more stable than Zn(II) complexes. The complexes' molar absorptivity values were determined to be 5744, 10019, 9414, and 17716 l.mol-1.cm-1 for Cd-1,3-PPB, Cd-1,4-PPB, Zn-1,3-PBB, and Zn-1,4-PBB, respectively. The sensitivities for Cd and Zn estimation by complexation with 1,3-PPB and 1,4-PPB, respectively, were determined to be 0.051, 0.089, 0.114, and 0.271 mg.l-1.
{"title":"Determination of Stoichiometry and Stability Constant of Cd(II) and Zn(II) Complexes with Pyrazole Based Ligands in Mixed Solvent (EtOH-H2O)","authors":"K. Elsherif, Ahmed Zubi, A. Najar, Hamida Bin Ghashir","doi":"10.51984/jopas.v21i2.2080","DOIUrl":"https://doi.org/10.51984/jopas.v21i2.2080","url":null,"abstract":"A Spectrophotometric investigation was applied on the complexation of 1,3-bis (3-(2-pyridyl) pyrazol-1-ylmethyl) benzene (1,3-PPB) and 1,4-bis (3-(2-pyridyl) pyrazol-1-ylmethyl) benzene (1,4-PPB) with Zn(II) and Cd(II) ions in a mixed (1:1) solvent of water and ethanol. The mole ratio methodology was used to calculate the stoichiometry, molar absorptivity, and stability constant values. Some experimental conditions have been investigated, including pH, ionic strength, solvent composition, and time. The results revealed the production of 1:1 complexes. In terms of ligands, 1,4-PPB was more stable than 1,3-PPB, whereas Cd(II) complexes were more stable than Zn(II) complexes. The complexes' molar absorptivity values were determined to be 5744, 10019, 9414, and 17716 l.mol-1.cm-1 for Cd-1,3-PPB, Cd-1,4-PPB, Zn-1,3-PBB, and Zn-1,4-PBB, respectively. The sensitivities for Cd and Zn estimation by complexation with 1,3-PPB and 1,4-PPB, respectively, were determined to be 0.051, 0.089, 0.114, and 0.271 mg.l-1. ","PeriodicalId":16911,"journal":{"name":"Journal of Pure & Applied Sciences","volume":"23 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75038315","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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