Genesis and petrology of Late Neoproterozoic pegmatites and aplites associated with the Taba metamorphic complex in southern Sinai, Egypt

We present new field, petrographical, mineralogical and geochemical data from late Neoproterozoic pegmatites and aplites in southern Sinai, Egypt, at the northernmost limit of the Arabian-Nubian Shield. The pegmatites cross-cut host rocks in the Taba Metamorphic Complex (TMC) with sharp contacts and are divided into massive and zoned pegmatites. Massive pegmatites are the most common and form veins, dykes and masses of variable dimensions; strikes range mainly from E-W through NW-SE to N-S. Mineralogically, the massive pegmatites are divided into K-feldspar-rich and albite-rich groups. Zoned pegmatites occur as lenses of variable dimensions, featuring a quartz core, an intermediate zone rich in K-feldspars and an outer finer-grained zone rich in albite. All compositions are highly evolved and display geochemical characteristics of post-collisional A-type granites: high SiO2, Na2O+K2O, FeO*/MgO, Ga/Al, Zr, Nb, Ga and Y alongside low CaO, MgO, Ba and Sr. They are rich in Rare Earth Elements (REE) and have extreme negative Eu anomalies (Eu/Eu*= 0.03-0.09). A genetic linkage between the pegmatites, aplites and alkali granite is confirmed by their common mild alkaline affinity and many other geochemical characteristics. These pegmatites and aplites represent the last small fraction of liquid remaining after extensive crystallization of granitic magma, injected along the foliation and into fractures of the host metamorphic rocks. The extensional tectonic regime and shallow depth of emplacement are consistent with a post-collisional environment

Effects of packaging and waxing on fruit quality and shelf life of some introduced mango cultivars

     Mango is one of the most important fruit crops in the Sudan. It is annually exported to Saudi Arabia, Gulf States and Western Europe. Recently, some internationally popular cultivars have been introduced to the Sudan. The objective of this research was to determine the effects of packaging and waxing on postharvest fruit quality and shelf life of some introduced mango cultivars from South Africa. Treatments consisted of three introduced mango cultivars; Tommy Atkins, Kent and Keitt and the local cultivar Abusamaka. Packaging treatments consisted of intact polyethylene film, perforated film, waxing and control. Treatments were arranged in a completely randomized design with three replicates. Data taken consisted of weight loss, total soluble solids (TSS), titratable acidity (TA), vitamin C and shelf life. Results showed that Abusamaka cultivar had the highest weight loss and Keitt had the lowest in both seasons. Packaging mango fruits in intact polymeric film resulted in the lowest weight loss, followed by perforated film, waxing and the highest weight loss was recorded for the control in both seasons. Abusamaka cultivar had the highest vitamin C and TA contents but had the lowest TSS content. However, Tommy Atkins had the highest TSS content but the lowest vitamin C and TA contents in both seasons. The longest shelf life was shown by Keitt cultivar, followed by Kent, Abusamaka and the shortest shelf life was recorded for Tommy Atkins in both seasons. Packaging mango fruits in intact polymeric film resulted in the lowest TSS, the highest TA, the highest vitamin C content and the longest shelf life. However, the highest TSS, the lowest TA, the lowest vitamin C and the shortest shelf life were recorded for the control. It is recommended to grow Keitt cultivar, harvest fruits at the mature green stage and package them in intact polymeric film or waxed to increase their shelf life and improve their quality.               تعتبر المانجو من أهم محاصيل الفاكهة في السودان. وهي تصدر إلى المملكة العربية السعودية ودول الخليج وغرب أوروبا. لقد تم استقدام بعض الأصناف المرغوبة عالمياً إلى السودان في السنوات الأخيرة. الهدف من هذه الدراسة هو معرفة تأثير التغليف والتشميع على نوعية الثمار وفترة الصلاحية لثمار بعض أصناف المانجو المستجلبة من جنوب أفريقيا. اشتملت المعاملات على ثلاثة أصناف مستجلبة من المانجو وهي تومي أتكنز وكنت وكيت بالإضافة إلى الصنف المحلي أبو سمكة. معاملات التغليف شملت تغليف الثمار في أكياس البولي إثلين السليمة أو المخرمة أو تشميع الثمار وأخرى استخدمت كشاهد بدون كيس أو تشميع. أستخدم التصميم العشوائي الكامل بثلاثة مكررات. اشتملت البيانات على فقدان الوزن والمواد الصلبة الذائبة والحموضة المعايرة وفيتامين ج وفترة الصلاحية. أظهرت النتائج أن الصنف أبو سمكة أظهر أعلى معدل فقدان للوزن بينما الصنف كيت كان له أقل فقدان للوزن في كلا الموسمين. تغليف ثمار المانجو في أكياس البولي إثلين السليمة أعطى أقل فقدان للوزن ويليه الأكياس المخرمة ثم التشميع وكان أعلى فقدان للوزن في الثمار غير المغلفة أو المشمعة في كلا الموسمين. الصنف أبو سمكة أعطى أعلى محتوى لفيتامين ج والحموضة بينما أعطى أقل محتوى للمواد الصلبة الذائبة. الصنف تومي أتكنز أعطى أعلى محتوى للمواد الصلبة الذائبة ولكنه أعطى أدنى محتوى من فيتامين ج والحموضة في كلا الموسمين. الصنف كيت أعطى أطول فترة للصلاحية، يليه  كنت ثم أبو سمكة وأقل فترة للصلاحية كانت للصنف تومي أتكنز في كلا الموسمين. تغليف ثمار المانجو في أكياس البولي إثلين السليمة أعطى أدنى محتوى من المواد الصلبة الذائبة وأعلى محتوى من الحموضة وفيتامين ج وأطول فترة للصلاحية. أما الثمار غير المغلفة أو غير المشمعة أعطت أعلى محتوى من المواد الصلبة الذائبة وأدنى محتوى من الحموضة وفيتامين ج وأقصر فترة للصلاحية. يوصى بإكثار وزراعة الصنف كيت وحصاد الثمار في طور النضج الاخضر وتغليفها في أكياس البولي إثلين السليمة لإطالة فترة صلاحيتها وتحسين نوعيتها

Thermal analysis of H.V insulation oil during partial discharge detection

Historically, the arc discharge analyzing technique was one of the first methods to determine the status of the insulation oil. Due to the harsh environment and the continue usage of the high voltage transformers, many problems of insulation can be produced leading to the failure of the transformer. The problem of the thesis is to find the best available solution to conduct real time analyzing of insulation oil of high voltage transformers, so that the high voltage transformer can be safeguarded from failure in the most effective and economic manner. In this work, the temperature of the insulation oil will be captured and calculated with and without partial discharge occurring. The simulated arc discharge is generated using 7.5 kV power source in two round shape steel electrodes having 5 mm gap. This distance (between the sensor and arc discharge source) is set at 5 cm. The infrared thermometer (laser gun) was used to capture the insulation oil temperature by sending a laser light toward the insulation oil and that light will be reflected beck and received by the device and then the temperature of the oil will be captured and measured. This study will help to predict the insulation oil age of high voltage transformers, which reduce the maintenance cost of high voltage transformer

Productive Performance of F1- (Damascus Goat × Desert) under Traditional Management in North Kordofan

This study carried out in North Kordofan state, Western Sudan (latitudes 12:15-16:32 N and longitudes 27-32 E), during the period Feb 2018 - Aug 2021 to assessment the productive and reproductive performance of crossed F1 (Desert× Damascus) under the traditional management systems, to evaluate adaptation of crossed to environmental conditions of study area, to study milk production of the crossed goats. 44 females crossed goat F1 (Damascus×Desert goat) were selected at weaning age. Two mature Damascus bucks were used in the experiment all animals were identified using ear tags and treated against external and internal parasites. All animals will set free during the day and kept in closed pen during the night. The behavior of the animals and the adaptation on the environment was observed and recorded in addition to any problems like disease; Data were analyzed using the Statistical Package for Social Sciences, software package (SPSS, V23, 2017). In this study, the Damascus Bucks were severely affected under the conditions of nature grazing and suffered from parasites and high temperature, Bucks have died as a result of tick fever according to Anatomical symptoms, The parameters of dams varied according to litter size, Females were born as a single reached puberty at (278.2±7 days) with body weight of 20.01 kg while the twins females was puberty age (291.6±9 days), and weight was 16.91kg , The average lactation period was 120 days with average total milk production of 40.46± 1.74 kg, this study conclude that the crossed Females are late in sexual maturity, So The genetic cross as a way to improve the herd without taking into account environmental conditions does not lead to the desired results.&nbsp

Lead isotope evolution of the Central European upper mantle: Constraints from the Bohemian Massif

This study focuses on Pb isotope data and whole-rock geochemistry of intrusive and extrusive volcanic rocks of the Bohemian Massif that sampled the upper mantle. Special attention is paid on whether Late Palaeozoic to Quaternary Central European mantle-derived rocks sampled different mantle sources on a local to regional scale and through time.Tato studie se zabývá Pb izotopovými daty a horninovou geochemií intruzivních i výlevných vulkanických hornin Českého masivu, které vzorkovaly svrchní plášť. Speciální důraz je kladen na to, zda pozdně paleozoické až kvartérní středoevropské horniny odvozené z pláště vzorkují odlišné plášťové zdroje v lokálním až regionálním měřítku a v průběhu času