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Intersection Curves of Implicit and Parametric Surfaces in R<sup>3</sup>

Applied Mathematics 2011年第8期2卷 1019-1026页

作者： Mohamed abdel-Latif Soliman Nassar Hassan abdel-All Soad Ali Hassan sayed abdel-naeim badr 不详

We present algorithms for computing the differential geometry properties of Frenet apparatus {t,n,b,κ,τ} and higher-order derivatives of intersection curves of implicit and parametric surfaces in R3 for transversal and tangential intersection. This work is considered as a continuation to Ye and Maekawa [1]. We obtain a classification of the singularities on the intersection curve. Some examples are given and plotted.

关键词： Geometric Properties Frenet Frame Frenet Apparatus Frenet-Serret Formulas Surface-Surface Intersection Transversal Intersection Tangential Intersection Dupin Indicatrices

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Structural and AC electrical properties study of solid metal urea complexes

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Journal of Advanced Dielectrics 2018年第2期8卷 60-66页

作者： Ragab Mahani Saleh D.Mekky badr A.El sayed Gamal S.EL-Bahy Azza Ward Microwave Physics and Dielectrics Department National Research Centre 33 EL Bohouth St.(former EL Tahrir St.)Giza-Egypt-P.O.12622 Chemistry Department Faculty of ScienceAlazhar University Nasr CityCairoEgypt Spectroscopy Department National Research Centre 33 EL Bohouth St.(former EL Tahrir St.)Giza-Egypt-P.O.12622

The complexation of solid urea with(Co^(2+)),(Cu^(2+))or(Ni^(2+))ions has been studied by using dielectric spectroscopy technique over a wide frequency range at different temper ***'structure were investigated by XRD,FTIR and FT-Raman *** and Raman analy sis indicated that the urea coordinates with the metal atoms through the same oxygen-metal bond(O-M).Furthermore,XRD analysis showed that the samples have polycrystalline structure with single *** pemittivity of complexes was found at much higher values than that of the ligand(pure urea),showing structure ***,two relaxation peaks were observed in the dielectric loss spectra corresponding to the orientation po larization of urea molecule,and some parts of urea molecule may be NH2 *** relaxation peaks correspond to thermally activated because they were shifted to higher frequency with the temperature *** peak position for the low frequency relaxation peak was observed lht the same relaxation time(τ=7.6× 10^(-4) s),corresponding to the coordination mode through the same O-M *** of this work is the successful finding of the relationship between the crystalline phase,coordination mode and the dy namic molecular behavior of solid urea and its complexes using the dielectric spec-troscopy techn ique.

关键词： Urea complexes IR XRD permitivity

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Physico-Chemical and Microbiological Study for the Stability of Phenytoin Sodium Extemporaneously Compounded Suspension in Saudi Arabia Hospitals

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Pharmacology & Pharmacy 2021年第1期12卷 1-9页

作者： Syed Ata ur Rahman Abdullah Alsaedi Abdulelah Alhusayni Abdulmalik Alqurshi Sameh Ahmed Yaser M. Alahmadi Alaa Omer M. Abdullaal badr Ahmed A. Taher El-sayed E. Habib Department of Pharmaceutics and Pharmaceutical Technology College of Pharmacy Taibah University Madinah Munawwarah Kingdom of Saudi Arabia Department of Pharmacy College of Health Sciences and Nursing AlRayan College Madinah Munawwarah Kingdom of Saudi Arabia Department of Pharmacognosy and Pharmaceutical Chemistry College of Pharmacy Taibah University Madinah Munawwarah Kingdom of Saudi Arabia Department of Clinical and Hospital Pharmacy College of Pharmacy Taibah University Madinah Munawwarah Kingdom of Saudi Arabia Pharmacy Department Madinah Maternity and Children Hospital Madinah Munawwarah Kingdom of Saudi Arabia Department of Microbiology and Immunology Faculty of Pharmacy Mansoura University Mansoura Egypt

Epilepsy is a chronic and the fourth most common neurological disorder which affects people of all age groups. Recently research and awareness on epilepsy-related deaths have rapidly grown over the past two decades. Many previous studies are attributed to the guidelines that apprise health care professionals in handling these deaths, but there is a relative scarcity of information accessible for clinicians and pharmacists who are responsible for manufacturing or preparing the extemporaneous anti-epileptic suspensions in the hospitals. Mostly in partial seizures, phenytoin is one of the first-choice drugs. In Saudi Arabian hospitals, the extemporaneous preparation of phenytoin suspension is common, but the hot climatic weather in Saudi Arabia possesses stability problems that should be tackled as the prepared suspension should pass all the stability tests to ensure uniform dosage of the extemporaneous formulation. In the current study, the commercial capsules were used to prepare the oral phenytoin sodium extemporaneous suspension. The physical, chemical and microbiological stability of phenytoin sodium suspension is analyzed at various temperatures.

关键词： Physical Stability Phenytoin Extemporaneous Preparation Chemical Stability Epilepsy

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