الأوراق العلمية


عرضالصفحاتالأوراق العربية ... عنوان الورقة + الملخصر.م
من 5 ـــ الي 13
الملخص

اه ???? ة والمي ???? ة رملي ???? حراوية والترب ???? ة ص ???? ث المنطق ???? دوة، حي ???? زارع غ ???? ن م ???? دد م ???? ى ع ???? ة عل ???? ة ميداني ???? رت دراس ???? ج ى ?? ين 6 إل ?? اً ب ?? راوح عموم ?? زارع تت ?? احات الم ?? ة أن مس ?? لال الدراس ?? ن خ ?? المستخدمة هي المياه الجوفية. ووجد م ودة ???? احات المحص ???? ا المس ???? ار . أم ???? ى 10 هكت ???? ين 7 إل ???? وليه ب ???? احات ألمحص ???? ت المس ???? ين تراوح ???? ي ح ???? ار، ف ???? 12 هكت فكانت تتراوح بين 6 إلى 9 هكتار للمزارع المدروسة . ا ، ???? ل منهم ???? ار لك ???? ار / هكت ???? ى 30 قنط ???? اج 25 إل ???? دل إنت ???? عير وبمع ???? ح والش ???? يل القم ???? ة محاص ???? ي المنطق ???? زرع ف ???? ت ذرة ?? ا ال ?? ار ،إم ?? ار /هكت ?? اج 3قنط ?? دل إنت ?? ة بمع ?? ار والفاآه ?? ار /هكت ?? ى 15 قنط ?? اج 10 إل ?? والخضراوات بمعدل إنت فتزرع للاآتفاء الذاتي. ض ???? احات بع ???? غلال مس ???? ي اس ???? ل ف ???? د الفش ???? ا يؤآ ???? ين 0.90 و 1.33 مم ???? تغلال الأرض ب ???? ة اس ???? ت درج ???? تراوح د ?? ا يؤآ ?? المزارع والنجاح في بعضها الآخر، في حين تراوحت نسبة المساحة المنتجة من 0.7 إلى 1.0 مم ين ?? احية ب ?? دة المس ?? ة الوح ?? ط غل ?? نجاح الزراعة في بعض المزارع وإخفاقها في مزارع أخرى .وتراوح متوس اج ?? دل إنت ?? ى مع ?? ة عل ?? ة الحديث ?? دات الزراعي ?? تخدام المع ?? ة واس ?? احة والملوح ?? ر المس ?? 12.3 و 25.3 مما يعكس أث وحدة المساحة .

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من 14 ـــ الي 20
الملخص

– ?? ة الزراع ?? لغرض التعرف على استجابة الفول للتلقيح البكتيري، طبقت تجربة حقلية في مزرعة آلي وائية ???? ات العش ???? ميم القطاع ???? تخدام تص ???? 2005 باس – 2004 و 2004 – امي 2003 ???? ي ع ???? ا ف ???? بها/ ليبي ???? ة س ???? جامع الكاملة بثلاث مكررات. ة ?? روتين مقارن ?? بة الب ?? أثرت معاملات التلقيح معنوياً في معظم صفات النمو والحاصل ومكوناته وفي نس ذور ?? ل للب ?? ى حاص ?? ق أعل ?? في قابليتها التعايشية وآفائتها في تحقي VP بمعاملة الشاهد. تفوقت العزلة المحلية 2 ذه ?? اد ه ?? ن اعتم ?? ذلك يمك ?? والي . ل ?? ى الت ?? اهد عل ?? ة الش ?? ة بمعامل ?? مين مقارن ?? بلغ ( 8.72 و 8.76 طن/ه) لكلا الموس العزلة المحلية في إنتاج اللقاح البكتيري واستخدامه في تلقيح بذور الفول تحت ظروف منطقة سبها.

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من 21 ـــ الي 27
الملخص

ية ?????? ة الشمس ?????? ال الطاق ?????? ي مج ?????? ف a-Si:H اء ?????? ة غش ?????? داثتها وأهمي ?????? وح LICVD ة?????? ة طريق ?????? را لأهمي ?????? نظ ازات ?? ط غ ?? يب بخل ?? ة الترس ?? نفس طريق ?? والإلكترونات فقد حًضر هذا الغشاء وبالطريقة أعلاه، وتمت اشابته ب p- و n-type ية ???? د أغش ???? يالين لتولي ???? از الس ???? ع غ ???? م (B2H6, SF6, BCl ي ( 3 ???? تخدمة وه ???? ثلاث المس ???? ابة ال ???? الاش 10- ى 4 ?? ن 0.1 إل ?? م (r = P doping gas/ P SiH غًيرت نسبة خلط غازات الاشابة مع غاز السيالين ( 4 .type ن ?? راوح م ?? لات تت ?? ز حام ?? بة ترآي ?? ى نس ?? ول عل ?? م الحص ?? ب وت ?? اء المرس ?? ي الغش ?? حنة ف ?? لتغيير نسبة حاملات الش ي ???? ول ف ???? أثير ه ???? ة ت ???? ى تقني ???? مد عل ???? ية. اعت ???? ول بالتحريك ???? اض معق ???? ع انخف ???? 1017 م cm- والي 3 ???? ى ح ???? 109 إل cm-3 ات ???? حنة (الإلكترون ???? املات الش ???? ز ح ???? ى ترآي ???? عل r ط???? بة الخل ???? ر نس ???? أثير تغي ???? ة ت ???? م دراس ???? ث ت ???? ات حي ???? راء القياس ???? إج والفجوات) وتحريكية هذه الحاملات.

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من 28 ـــ الي 40
الملخص

هذا العمل دراسة لأنظمة الهوائيات الذآية واستخدامتها في نظم الاتصالات الخلوية (النقال)، وتحقيق Standard )LMS الزيادة في السعة والمدى عن طريق استخدام هوائيات الصف التكيفي وخوارزمية ومن خلال محاآاة النظام (الهوائي التكيفي) تم الحصول على أقل ،(least mean square Algorithm . مربع خطأ عند معامل حجم خطوة 0.03

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عرضالصفحاتالأوراق الاجنبية .... عنوان الورقة + الملخصر.م
من 5 ـــ الي 18
الملخص

The study explored the impact of multiple exposure of immature mammals to a non-lethal dose of a widely used organophosphorus insecticide on testicular development. Six doses, each of 70 ?L Neocidol / kg mouse body weight (diluted with distilled water in a fixed volume of 0.1 mL), were subcutaneously injected, at 48-hours intervals, into 28 days old immature Swiss albino mice. At age day 42, animals from the control and treatment groups were euthanized and their testicularepididymal structures were dissected out and transferred into a fixative solution. Other animals of both groups were saved until age day 75 to test their fertility. Spermatogenesis and presence of sperms in the epididymis were emphasized. Hematoxylin- eosin stained 5 ?m thick testicular sections of the 42 days old control mice showed initiation of spermatogenesis in the majority of the seminiferous tubules. Epididymal tubules of the same animals contained considerable number of sperms. Testicular picture of the Neocidol treated mice revealed some non-opened disorganized seminiferous tubules, some opened but filled with cellular debris, whereas few others were opened with limited spermatogenesis activity. Epididymal tubules were either devoid of sperms or showed reduced number of sperms into their lumens. Pair mating of 75 days old control and Neocidol exposed male mice with adult fertile proved females, gave 22 pregnancies / 22 mated females and 18 pregnancies / 25 mated females, respectively. Number of alive fetuses per gravid uterus at pregnancy day 17 and body weight means of the alive fetuses in both groups were close to each other. No resorptions were noticed. The organophosphorous compound might cause the observed deviations through its direct actions on the cellular elements of the target organs and / or indirectly through disrupting the hormonal functions that are required for normal morphological- functional development. Production of non- viable sperms could explain the reduction in pregnancy rate.

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من 19 ـــ الي 30
الملخص

Alginic acid was prepared from commercial sodium alginate using HCl in ethanol: water mixture (30:70). The prepared alginic acid (PAA) was characterized by determination of carboxyl content and solubility %. The AA sample acquires of 450 ml equivalent (meq) -COOH/100 g sample and exhibits the complete insolubility in water and purity of 98 %. The PAA was utilized as adsorbent material to remove Pb(II) ions from aqueous solutions. Factors affecting adsorption process such as, agitation time, pH and adsorbate concentration were examined. The adsorption data show that, the maximum adsorption capacity, Qmax of Pb (II) onto AA is 909.9 mg/g. The adsorption data also showed that the adsorption of Pb (II) onto PAA obey Langmuir and Freundlich isotherms.

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من 31 ـــ الي 49
الملخص

The study presented in this paper investigated the performance of a proposed thermal power system comprising Brayton and inverse Brayton cycles and their developed configurations. It has been carried out by varying the Brayton cycle pressure ratio for different values of the expansion pressures of the inverse Brayton cycle using variable, above atmospheric, inlet pressures. The results indicated that better performance could be achieved when the proposed system and developed configurations are operated at high overall pressure ratio. The results revealed that the base system is superior to the simple gas turbine cycle over the whole chosen range of Brayton cycle pressure ratios. It was observed that the system with regeneration attained the best efficiency value with smallest work output but with the longest payback period of the configurations examined.

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من 50 ـــ الي 63
الملخص

Cavitation in a centrifugal pump causes deterioration of the hydraulic performance, damage to the pump components, high vibration and load noise. To prevent cavitation and maintain pump performance, it is necessary to detect and diagnose the cavitation as accurately as possible. This paper presents non-destructive method to detect and diagnose cavitation in centrifugal pumps using structure vibration. The vibration data was measured close to the discharge port and analysed in the time and frequency domains. It has been found that structure vibration can be used successfully for detecting cavitation in centrifugal pump.

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من 64 ـــ الي 84
الملخص

Gabal Abu Edam area occupies the eastern part of G. Qattar. It is covered by dioritic rocks that overlain by Hammamat sediments. They were intruded by younger granites in sharp intrusive contact. These granitic rocks are biotite hornblende granites and perthite granites. The biotite hornblende granites are intruded by the perthite one in its core to aappear as ring. The biotite – hornblende granite was intruded by acidic dykes while the perthite granites were intruded by acidic and basic ones. It worth to mention that some acidic dykes not pass through the perthite granites. These dykes are trending NE – SW. Petrographically, the granitoid rocks are ranging from diorite to younger granites. The diorites are formed mainly of plagioclase, hornblende with minor orthoclase and biotite as essential minerals, while the accessories are iron oxides, apatite and sphene. The younger granites are classified into subsolvus biotite - hornblende granites and hypersolvus perthite granites. The zircon, iron oxides, apatite, allanite, xenotime are the main accessories. In the perthite granites the alkali feldspars exceed the quartz content to seem as syenogranite. Thus this arrangement of the granitic rocks from diorite to pertite granite could be considered as ring complex or zoned granite.Structurally, primary and secondary structures are recorded. The primary structures are represented by stratifications and laminations which are well distinct in the Hammamat sediments. The bedding of these sediments are striking NW – SE and dipping in NE direction. The secondary structures are represented by faults and joints. The faults are directed in NNW – SSE, NW – SE, NE – SW and ENE – WSW directions while the joints are trending in NW – SE, ENE – WSW and WNW – ESE directions. These faults and joints acted as passways for the hydrothermal solutions carrying radioactive minerals. Radiometrically, all the exposed rocks are measured in the field. It is found that the lowest radioactive rock is the diorite while the highest radioactive ones are the younger granites. The most radioactive rock among the younger granites is the perthite granite which shows uranium content varying between 13ppm and 21ppm. The radioactive anomalies are recorded along faults and near contact zones of dykes and granite and show average uranium and thorium contents of 600ppm and 500ppm respectively. The factors controlling the radioactivity are the lithology, grain size, mineralogy, hydrothermal alterations and structural features.

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من 85 ـــ الي 100
الملخص

Abu Murrat granitic rocks represent one of the Pre-Cambrian acidic intrusions of the northeasthern desert Egypt (~100km2). Zircon morphology, U-Pb geochronology and zircon saturation temperatures of these rocks have been studied in order to understand the crystallization history. These granitic rocks have been classified as three different intrusions: granodiorite, monzogranite and more evolved alkali granite. The crystal morphology of zircon grains exhibits the dominance of subrounded shape possibly due to the partial melting during the igneous activity before the emplacement of the intrusions. Moreover, these zircon grains are unzoned and core-free crystals. These granitic rocks represent homogeneous U-Pb ages together with undisturbed isotopic compositions, which suggest and preclude any major role played by inherited materials or post-magmatic events. This may suggest that the igneous processes involved in derivation of these rocks were dominated by magmatic ones. However, slight U-Pb discordance of monzo-and alkaligranite analyses are possibly due to amount of structural damages within grains. It is proposed that all three intrusions were dominated by basic source materials, with two main episodes of crystallization, one for granodiorite (658.6Ma) with temperatures in the range of 808-830oC and another for more differentiated monzogranite (621.86Ma). The crystallization of monzogranite probably occurred after new pulses of basic magma with high Zr contents were introduced into the magma chamber. Such magma composition would raise the crystallization temperature to 880- 896oC and increase zircon population in this intrusion (monzogranite). Thereafter, the rest of magma differentiated with time and crystallized another phase of monzogranite at 613.6-612.9Ma., until the crystallization of alkali granite occurred at 598.9Ma with temperatures consisten with those of granitic rocks (769-779oC).

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