Theobromine, theophylline, and caffeine retention times in a C₁₈ HPLC column (stationary phase) were investigated as a function of mobile phase flow rate, mobile phase composition, and column temperature. When the mobile phase flow rate increased from 0.1 to 1 mL/min and the methanol concentration increased from 5 to 30%, the retention time and peak width of these three compounds were found to be reduced. While there was a small influence of increasing the mobile phase flow rate on the resolution, decreasing the methanol concentration in the mobile phase considerably reduced the resolution. In addition, the mobile phase flow rate and composition were determined to have a more significant impact than the column temperature

   Recently, one of the most crucial objectives for the petroleum refining industries is producing clean or eco-friendly fuel. The world demands clean diesel utilizing simple processes under safe conditions (i.e., moderate operating conditions). For this purpose, an oscillatory helical baffled reactor (OHBR) was designed to improve the oxidative desulfurization (ODS) process, which is achieved here by converting sulfur compounds found in diesel fuel using a new homemade nanocatalyst. First, the homemade catalyst support, γ-alumina nanoparticles, was prepared using precipitation technology. The γ-Al₂O₃ was then used to design the synthetic nanocatalyst made of iron oxide using the IWI technology with 5% Fe_2<

أهمية البحث والحاجة إليه :

يعد تفعيل بناء المؤسسات التربوية ورفع مستواها من المهمات الأساسية  التي ينبغي تحقيقها من خلال تحسين دورها في التعبير عن الأرادة المجتمعية المرتبطة  والمتناغمة مع مقومات البيئة المادية والبشرية وعلى وفق متغيري الزمان والمكان، وان مسؤولية الأدارة التربوية تتمحور في أعادة النظر في هياكلها الوظيفية الادارية واستثمار الطاقات البشرية العاملة وتنظيمها ووضعها

This study was aimed to prepared new polymeric coverings reinforced by the naturally occurring pigment anthocyanins and investigate their biological efficacy when combined with certain drugs against specific kinds of microbe’s pathogens. FT-IR spectroscopy and mass spectrometry (MS) were used to identify the active groups of the anthocyanin pigment, which were situated the functional groups of anthocyanin in contrast to crystalline compounds, X-ray diffraction (XRD) examination also revealed the production of irregularly constituted compounds. Furthermore, all derivative compounds were had high inhibitory activity against the Gram-positive bacteria Staphylococcus aureus, as well as against the fungus Candida albicans in different conce

 Medicine in the Al-Jahiliya was a primitive medicine confined to experiments inherited among individuals. The Arabs were interested in the work of Greek doctors and ancient Romans, such as Hippocrates, Galenos and Descaridos, whom the Syriacs had transferred to their language in a school. Who fled to escape the persecution of the Byzantine emperors of the Nestorian doctrine which they embraced. With the beginning of the Abbasid period,

: The Aluminium (Al) material emerged as a plasmonic material in the wavelength ranges from the ultraviolet to the visible bands in different on-chip plasmonic applications. In this paper, we demonstrate the effect of using Al on the electromagnetic (EM) field distribution of a compact hybrid plasmonic waveguide (HPW) acting as a polarization rotator. We compare the performance of Al with other familiar metals that are widely used as plasmonic materials, which are Silver (Ag) and Gold (Au). Furthermore, we study the effect of reducing the geometrical dimensions of the used materials on the EM field distributions inside the HPW and, consequently, on the efficiency of the polarization rotation. We perform the study based o

The present study aims to identify the extent to which biology book of sixth grade achieves the basic scientific aspects in light of its scientific objectives. To achieve this goal, the researcher needed to build two questionnaires to evaluate the biology book for sixth-grade. To answer the questions of the study, the researcher used the following statistical methods : the weighted average, and percentages; and to identify the extent to match the perspective of teachers of the material with the perspective of a researcher in each paragraph of the questionnaire as well as the degree of severity of each paragraph in the book neighborhoods sixth-grade has reached Aalbagesh to several of the most important results: 1. All the teachers were w

The water when it passes through the magnetic field becomes more dynamic than the biological standpoint, and helps improve blood flow, and connected to the body's tissues and cells, and is the process of drinking water is magnetized before, during and after training and competitions by athletes in general and basketball players in particular are very important to compensate lack of body fluids lost during and to reduce the negative effects of this lack of work and the efficiency of various body organs, and the problem of the research were the that all the means used locally for the development of physical performance and functional for athletes in general and basketball playe

تقدم هذه الدراسة مستشعرًا يستخدم تقنية الألياف الكريستالية الضوئية ( PCF ) وتقنية رنين البلازمون السطحي ( SPR ). تم تطبيق الذهب ( Au ) كطبقة رقيقة على ألياف كريستالية ضوئية ( PCF )، والتي كانت مغلفة سابقًا بمركب ذهبي
مستقر كيميائيًا يُظهر خصائص بلازمونية. كان سمك طلاء الذهب 40 نانومتر. تم تقييم مقاييس الأداء، مثل الحساسية  بما في ذلك حساسية الطول الموجي وحساسية السعة والقرار، عن طريق المحاكاة عبر برنامج COMSOL . تم تطوي

دلائل نبوة محمد  rوأسس فهمها

في رسائل النور

                                     ملخّص البحث     

توصل البحث إلى أن دلائل نبوة محمد r في رسائل النور بلغت اثنتي عشر دليلاً، خمسة منها تابع الأستاذ النورسي غيره، وهي: القرآن الكريم. و

ان حق مخاطبة السلطات العامة عن طريق العرائض والشكاوى يعد احد الوسائل الفردية للمشاركة في الشؤون العامة المقررة للافراد، وذلك لما تتضمنه هذه العرائض من مسائل مهمة للفرد والمجتمع والسلطات العامة على حد سواء، كما ان حق مخاطبة السلطات العامة يمنح المواطن دورا ايجابيا ومهما في الحياة العامة لانه يتيح له الاتصال بالسلطات بشكل مباشر وتقديم مقترحاته وتظلماته، كما ان حق مخاطبة السلطات العامة يعد ضامنا حقيقيا للحق

هدفت دراسة الى اعداد تمرينات خاصة باستخدام الحبال المطاطية لتطوير بعض القدرات البدنية وانجاز فعالية رمي القرص فئة (F56) للشابات، التعرف على تأثيرها في تطوير بعض القدرات البدنية وانجاز فعالية رمي القرص فئة (F56) للشابات. واستخدم الباحثان المنهج التجريبي بتصميم المجموعة الواحدة، وحددت عينة البحث بالطريقة العمدية من لاعبات منتخب الشباب للمعاقات على الكراسي من الجلوس فئة (F56) لفعالية رمي القرص. تم تطبيق المنهج الت

An experiment was carried out in one of the private field in AL-Radwaniah westeren south of Baghdad to study the effect of irrigation intervals, irrigation after 6, 8 and 10 days (D₁, D₂ and D₃) and irrigation of salicylic acid concentration (0, 50, 100, and 150 mg/l) (S₀,  S₁,  S₂ and S₃) on some vegetative growth and yield parameters. Potato tuber were planted on 1 Feb 2015 using application  N, P, K in the rate 120: 60: 200 kg/ ha. Plants were irrigated after 6,8 and 10 days and spraying of salicylic acid three time, First in vegetative growth stage and in stolon intiation stage and in tuber intiation stage. Factorial experiment in Nist

يُعدُّ ألإستثمار في هوية المكان مفيدًا من الناحية الإقتصادية، والإجتماعية، والثقافية، والفيزيائية ولا يتعلَّق الأمر بالربح المادي فقط ، ويتطلَّب التحقُّق من خصائص ومميزات المكان وإستثمارها لإنشاء ميزة تنافسية عالمية وضمان إستدامة المكان على المدى الطويل ويتم ذلك من خلال تعزيز التطورات الحضرية التي تركِّز على الموارد المادية والإجتماعية، والثقافية للمدينة ,تهدف هذه الدراسة إلى تحقيق التميُّز وتعزيز هو

التغيُّر الذي يحصل في مسار الانهار يعدُّ من المشاكل المستمرة الحدوث في مسار الأنهر وكون المدن في غالب الاحيان تنشأ على تلك المسارات مما يولد مشكلة التآكل والترسيب في ضفاف الانهر الذي ينعكس على الملكية العقارية الواقعة على تلك الضفاف حيث يهدف البحث الى تشخيص الآثار السلبية التي تحدث عند تغيُّر مسار الأنهار على الملكية العقارية من خلال استعمال البرامج الحديثة لرصد تلك التغيرات و الوصول الى معالجات تخطيطية .

This research was conducted during the season of 2014 - 2015 inside unheated green house to investigate the effect of sprays number and different concentrations of micronite 35 (0.0, 1.0, 2.0, 2.5 and 3.0 cm³ .l^-1) and their interaction on growth and yield of Pepper var. California Wonder with using (RCBD) with three replicates. Results showed that the sprays number and the concentrations of micronite 35 and their interaction had a significant effect on all the characteristics that studied. The interaction of three sprays with 3 cm³ .l^-1 of micronite 35 gave the highest average of plant height (103.12cm

من أبرز مبادىء الزراعة الحضرية في المدن المستدامة هي الاستغلال الأمثل للموارد الارض المتوفرة عن طريق إدارة جيدة لتحقيق (أقصى انتاج, أوفر غذاء ,أعلى دخل) فضلا عن مساهمتها في تعزيز الاقتصاديات المحلية من خلال تعزيز المرونة الغذائية لزراعة الحضرية داخل المدن الحضرية بصورة دائمية ومستمرة على مر السنين بدون استنزاف للموارد الطبيعية والحفاظ على الاراضي الزراعية من التدهور. تعدُّ الزراعة الحضرية نشاط اقتصادي قو

The need for optical fibers has emerged for its ability to transmit information with less attenuation and over long distances. In this work, four optical fibers with core radii from 1 μm to 4.75 μm in steps of 1.25 μm and a numerical aperture of 0.17 were studied and their modes properties have been calculated at a wavelength of 633 nm by using RP Fiber Calculator (free version 2022). Also, the effect of increasing the core radius on these properties has been studied. Multimode fibers can be obtained when the radius of the fiber core is large compared to the operating wavelength of the fiber which is less than the cutoff wavelength of the mode. Otherwise, a single-mode fiber is obtained. It has been concluded that all the calculated p

The  lossy-FDNR  based  aclive  fil ter has an  important   property among  many  design  realizations. 'This includes  a significant reduction in component count particularly in the number  of OP-AMP which consumes   power.  However  the·  problem  of  this   type  is the  large component spreads  which affect the fdter performance.

In  this  paper   Genetic   Algorithm   is  applied   to  minimize   the component  spread   (capacitance  and  resistance  p,read). The minimization of these spreads allow the fil

تشكلت المحكمة الاتحادية العليا في العراق بموجب قانون المحكمة الاتحادية العليا رقم (30) لسنة 2005 بناءً على ما اقره قانون إدارة الدولة العراقية للمرحلة الانتقالية لعام 2004 ، وقد تضمن القانون إشارة واضحة إلى الغرض الاساسي الذي انشأت من اجله المحكمة الاتحادية العليا وهو الفصل في تنازع الاختصاص بين مستويات الحكم المختلفة , بالاضافة الى اختصاصها في الرقابة على دستورية القوانين . ثم اشير اليها في دستورعام 2005 وحددت اخ

  A quantum mechanical description of the dynamics of  non-adiabatic electron transfer in metal/semiconductor interfaces  can be achieved using simplified models  of the system. For this system we can suppose two localized quantum states donor state |D› and acceptor state |A› respectively. Expression of rate constant of electron transfer for metal/semiconductor system derived upon quantum mechanical model and perturbation theory for transition between |𝐷〉 and |𝐴〉 state when the coupling matrix element coefficient is smaller than 0.025eV. The rate of electron transfer for  Au/ ZnSe and Au/ZnS interface systems is evaluated with orientation free energy using a Matlap program. The

Stud arc welding has become one of the most important unit operations in the mechanical industries. The need to reduce the time from product discovery to market introduction is inevitable. Reducing of standard deviation of tensile strength with desirable tensile strength joint as a performance character was use to illustrate the design procedure. The effects of (welding time, welding current, stud material, stud design, sheet material, sheet thickness, sheet cleaning and preheating) were studied. Design of Experiment (DOE) is a structured and organized method to determine relationships between factors affecting a process and output of the process itself. In order to design the best formulation it is of course poss

The implementation of decentralization in Iraq was asymmetrical, leading to different forms and paces of implementation. Comparing four cases of Basra, Kirkuk, Nineveh, and Sulaymaniyah indicate that these cases differ in their political stability and autonomy in a way that led to a different forms of decentralization. This paper argues that the higher the level of political autonomy from the federal government, the more efficient the governance model, and the more efficient the governance model, the more legitimate the system (trust), and the more legitimate a system, the more accountable elected officials. Therefore, it recommends reforming the institutional setup of decentralization by having districts, instead of provinces, as the bu

The importance of the research is evident in the use of exercises with the training device, which is one of the modern techniques in teaching the abilities of players, especially in teaching the skill of the backhand, and in improving the accuracy of the performance of players and increasing the contribution to the formation of a base for the game for players who have a good level of learning and upgrading the game to reach a certain achievement, and the research issue was represented in the lack of accuracy in sending balls to the required areas to achieve points, especially in the performance of the skill of the backhand due to the speed of play during the course of the match, and the study aimed to introduce modern technology using th

ان العملية التعليمية شغلت بال الكثيرمن الباحثين والمختصين في مجال التعلم والتعليم، وبما ان المدرس هو أحد الاركان الاساسية التي تستند عليها عملية التعليم فأن المدرس الناجح هو الذي يحاول ايجاد أفضل الطرق بحيث تتناسب وقدرات ومستوى الطلبةوتكمن أهمية البحث بأستخدام التعلم التبادلي بأسلوب التمرين المتغير والثابت في تعليم بعض المهارات الاساسية الهجومية بكرة السلة, لكي يسهم في تقديم أسلوب تعليمي جديد يساعد على

هدف البحث إلى إعداد منهاج لدرس التربية الرياضية يهدف إلى تنمية بعض عناصر اللياقة البدنية لتلاميذ الصف الأول المتوسط ، والتعرف على أثر المنهاج المقترح في تنمية بعض عناصر اللياقة البدنية لعينة البحث.وأفترض الباحثون وجود فروق ذات دلالة إحصائية بين نتائج الاختبارات القبلية والبعدية للمجموعتين التجريبية والضابطة في بعض عناصر اللياقة البدنية ولصالح الاختبارات البعدية ، إضافة إلى وجود فروق ذات دلالة إحصائية ب

The cost management of cost indicators in housing projects, on the level of planning and design, is the most important quality indicators, for adoption of strategies of planning and design efficient in managing these indicators. So this research points out the need to highlight the most effective and influential cost indicators in housing projects, and to determine strategies in the management of these indicators in order to raise the efficiency of housing projects quality, to seemly the income level target group, taking into consideration the quality of housing standards, to achieve the basic requirements of housing. This paper highlights the importance of the cost  management, the types of housing cost, the method

The Fatimids were arguing with the Abbasids in everything, even in the causes of civilization, and the Islamic moderization had matured,

Based on Lyapunov exponent criterion, the aircraft lateral-directional stability during critical flight cases is presented. A periodic motion or limit cycle oscillation isdisplayed. A candidate mechanism for the wing rock limit cycle is the inertia coupling between an unstable lateral-directional (Dutch roll) mode with stable longitudinal (short period) mode. The coupling mechanism is provided by the nonlinear interaction of motion related terms in the complete set equations of motion. To analyze the state variables of the system, the complete set of nonlinear equations of motion at different high angles of attack are solved. A novel analysis including the variation of roll angle as a function of angle of attack is proposed. Furthermore

Diabetic Nephropathy(DN) is a complex disease manifested by persistence microalbuminuria   occurring due to the interaction between hemodynamic and metabolic pathway that activates the local renin-angiotensin-aldosterone system resulting in a decline in renal functions.

This study aimed to quantify the associations between serum aldosterone concentration and fetuin- A as a marker of calcification in type 2 diabetic patients with and without microalbuminuria from one side, and study the possible relationship between aldosterone and fetuin-A with glycemic indices, serum electrolyte, renal function and microalbuminuria and body mass index from the other side.

A case-control study involved eighty-six adult subjects