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Validated method for the Simultaneous Determination of Lisinopril, Pravastatin, Atorvastatin and Rosuvastatin in API, Formulations and Human Serum by RP-HPLC

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Chinese Journal of Chemistry 2011年第6期29卷 1216-1220页

作者： Najma, Sultana Arayne, m. saeed Safila, Naveed United Biotechnologies Karachi-75290 Pakistan Faculty of Pharmacy Hamdard University Karachi-74600 Pakistan

Lisinopril is found to be useful in hypertension and statins as cholesterol lowering drug. Present work was designed for the simultaneous determination of lisinopril in presence of pravastatin, atorvastatin, and rosuvastatin using RP-HPLC method. A Purospher star C 18 （5 μm, 25 × 0.46 cm） column was used with mobile phase consisting of acetonitrile ： water （60 ： 40 V/V, pH 3.0） with flow rate of 1.0 mLomin-1 and the quantitative evaluation was performed at 225 nm. The retention time of lisinopril was 2.0 min and for pravastatin, rosuvastatin and atorvastatin was found to be 3.1, 4.5 and 8.3 min respectively. Suitability of this method for the quantitative determination of the drugs was proved by validation in accordance with the requirements laid down by International Conference on Harmonization （ICH） guidelines. Application of the suggested procedures were successfully applied to the determination of these compounds in active pharmaceutical ingredient and in pharmaceutical preparations, with high percentage of recovery, good accuracy and precision.

关键词： Lisinopril statins method validation HPLC determination

Comparative Study of Plasma Parameters in magnetic Pole Enhanced Inductively Coupled Argon Plasmas

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Plasma Science and Technology 2013年第4期15卷 329-334页

作者： F.JAN A.W. KHAN A.saeed m.ZAKAULLAH Department of Physics Quaid-i-Azam University Department of Physics Gomal University

Langmuir probe measurements of radio frequency （RF） magnetic pole enhanced inductively coupled （maPE-ICP） argon plasma were accomplished to obtain the electron number densities and electron temperatures. The measurements were carried out with a fixed RF frequency of 13.56 mHz in a pressure range of 7.5 mTorr to 75 mTorr at an applied RF power of 10 W and 100 W. These results are compared with a global （volume average） model. The results show good agreement between theoretical and experimental measurements. The electron number density shows an increasing trend with both RF power and pressure while the electron temperature shows decreasing trend as the pressure increases. The difference in the plasma potentim and floating potential as a function of electron temperature measured from the electrical probe and that obtained theoretically shows a linear relation with a small difference in the coefficient of proportionality. The intensity of the emission line at 750.4 nm due to 2pl → 1s2 （Paschen＇s notation） transition closely follows the variation of ne with RF power and filling gas pressure. measured electron energy probability function （EEPF） shows that electron occupation changes mostly in the high-energy tail, which highlights close similarity of 750.4 nm argon line to he.

关键词： maPE-ICP Langmuir probe global model

Preserving Privacy of User Identity Based on Pseudonym Variable in 5G

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Computers, materials & Continua 2022年第3期70卷 5551-5568页

作者： mamoon m.saeed mohammad Kamrul Hasan Rosilah Hassan Rania mokhtar Rashid A.saeed Elsadig Saeid manoj Gupta Electrical Engineering Department Faculty of EngineeringAlzaiem Alazahri UniversityKhartoumSudan Center for Cyber Security Faculty of Information Science and TechnologyUniversiti KebangsaanMalaysia(UKM)43600BangiMalaysia Department of Computer Engineering College of Computers and Information TechnologyTaif UniversityPO Box 11099Taif21944Saudi Arabia Department of Electronics Engineering College of EngineeringSudan University of Science and TechnologyKhartoumSudan Department of Electronics and Communication Engineering JECRC UniversityJaipurIndia

The fifth generation(5G)system is the forthcoming generation of the mobile communication *** has numerous additional features and offers an extensively high data rate,more capacity,and low ***,these features and applications have many problems and issues in terms of security,which has become a great challenge in the telecommunication *** paper aimed to propose a solution to preserve the user identity privacy in the 5G system that can identify permanent identity by using Variable mobile Subscriber Identity,which randomly changes and does not use the permanent identity between the user equipment and home *** this mechanism,the user identity privacy would be secured and ***,it improves the synchronization between mobile users and home ***,its compliance with the Authentication and Key Agreement(AKA)structure was adopted in the previous *** can be deployed efficiently in the preceding generations because the current architecture imposes minimal modifications on the network parties without changes in the authentication vector’s message ***,the addition of any hardware to the AKA carries minor adjustments on the network *** this paper,the ProVerif is used to verify the proposed scheme.

关键词： 5G privacy and security user identity ImSI authentication and key agreement(AKA)

Activation Energy of Nitriding medium Carbon Ferromanganese Alloy

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Journal of Iron and Steel Research International 2013年第1期20卷 58-61,78页

作者： saeed N Ghali mamdouh m Eissa micheal L mishreky Steel Technology Department Central Metallurgical Research and Development Institute (CMRDI)Helwan 11421CairoEgypt

Investigation of some kinetics aspects of the reaction between nitrogen and medium carbon ferromanganese （mC-Femn） was made. Nitriding process of fine medium carbon ferromanganese was carried out at temperature ranging from 973 to 1 223 K and time up to 480 min. Nitriding was carried out under nitrogen and hydrogen gas pressures. At temperature of 573 K, hydrogen gas was injected with pressure of about 0.2 mPa followed by injection of nitrogen gas up to 1.2 mPa. Sample mass was 35 g, nitrided in cylindrical chamber with 34 mm in inner diameter and 1 200 mm in length. The change in nitrogen pressure was taken as an indication for nitrogen pickup. The mass gain i.e. nitrogen pickup in kilograms per surface area （m2） was determined by time at different temperatures. Nitriding rate constants were calculated and the activation energy of nitriding process was derived from Arrhenius equation. The nitriding rate constant was found to be increased by increasing temperature of the reaction. The activation energy of nitriding process of fine medium carbon ferromanganese at time ranging up to 28 800 s is around 140 kJ/mol. It was found that the rate controlling step of the nitriding process of mC-Femn is diffusion mechanism.

关键词： nitriding ferromanganese gas solid reaction activation energy

Evaluation of sediment contamination in the Red Sea coastal area combining multiple pollution indices and multivariate statistical techniques

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International Journal of Sediment Research 2021年第2期36卷 243-254页

作者： Yousef saeed Saleh Biology Department Faculty of Science Taiz University

In the recent years, the Red Sea coast of Yemen has been severely affected by intensive anthropogenic activities. The current study constitutes a thorough inquiry to evaluate the extent of heavy metals pollution in Yemen’s Red Sea coast sediment and identifies the possible sources of pollution. The concentrations of five metals(copper(Cu), zinc(Zn), cadmium(Cd), lead(Pb), and nickel(Ni)) collected from nine sites along the Red Sea coast of Yemen were assessed using an atomic absorption spectrophotometer(ASS). Sediment quality indices, such as the sediment quality guidelines(SQGs), potential ecological risk(RI), contamination factor(CF), pollution load index(PLI), geoaccumulation index(Igeo), and modified degree of contamination(m Cd) were computed. In addition, multivariate statistical techniques(principal component analysis(PCA),hierarchical cluster analysis, and Pearson’s correlation analysis) were applied to identify the potential sources of metals. The mean concentrations of Cu, Zn, Cd, Pb, and Ni were 51.3, 61.9, 4.02, 9.9, and 33.4 mg/kg dry wt, respectively. The spatial distribution revealed that the metals concentrations were high at the middle zone and low southward of Hodeida city. According to the SQGs, the adverse biological effects of metals were occasionally associated with Cu and Cd, frequently associated with Ni, and not expected to occur with Zn and Pb. The RI indicated that the sediment of the studied sites pose low(RI mean effect range-median quotient(m-ERm-Q) indicated that the combination of the studied metals had the toxicity probability of 21% at all studied sites. Igeo and CF indicated that the metals concentrations were in the descending order of: Zn > Ni > Pb > Cd > Cu,whereas the PLI and m Cd indicated that Ras Isa(Site 5) and Urj village(Site 6) were the most polluted ***, cluster analysis, and correlation analysis found that Cd, Pb, and Ni mostly originated from anthropogenic

关键词： Red Sea Heavy metals Pollution Spatial distribution Sediment quality

An Automated System to Predict Popular Cybersecurity News Using Document Embeddings

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Computer modeling in Engineering & Sciences 2021年第5期127卷 533-547页

作者： Ramsha saeed Saddaf Rubab Sara Asif malik m.Khan saeed murtaza Seifedine Kadry Yunyoung Nam muhammad Attique Khan National University of Sciences and Technology IslamabadPakistan Beriut Arab University BeirutLebanon Department of Computer Science and Engineering Soonchunhyang UniversityAsanKorea Hitec University TaxilaPakistan

The substantial competition among the news industries puts editors under the pressure of posting news articleswhich are likely to gain more user attention. Anticipating the popularity of news articles can help the editorial teamsin making decisions about posting a news article. Article similarity extracted from the articles posted within a smallperiod of time is found to be a useful feature in existing popularity prediction approaches. This work proposesa new approach to estimate the popularity of news articles by adding semantics in the article similarity basedapproach of popularity estimation. A semantically enriched model is proposed which estimates news popularity bymeasuring cosine similarity between document embeddings of the news articles. Word2vec model has been used togenerate distributed representations of the news content. In this work, we define popularity as the number of timesa news article is posted on different websites. We collect data from different websites that post news concerning thedomain of cybersecurity and estimate the popularity of cybersecurity news. The proposed approach is comparedwith different models and it is shown that it outperforms the other models.

关键词： Embeddings semantics cosine similarity popularity word2vec

Flow on oscillating rectangular duct for maxwell fluid

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Applied mathematics and mechanics(English Edition) 2012年第6期33卷 717-730页

作者： m.NAZAR F.SHAHID m.saeed AKRAm Q.SULTAN Centre for Advanced Studies in Pure and Applied mathematics Bahauddin Zakariya University

This paper presents an analysis for the unsteady flow of an incompress- ible maxwell fluid in an oscillating rectangular cross section. By using the Fourier and Laplace transforms as mathematical tools, the solutions are presented as a sum of the steady-state and transient solutions. For large time, when the transients disappear, the solution is represented by the steady-state solution. The solutions for the Newtonian fluids appear as limiting cases of the solutions obtained here. In the absence of the fre- quency of oscillations, we obtain the problem for the flow of the maxwell fluid in a duct of a rectangular cross-section moving parallel to its length. Final!y, the required time to reach the steady-state for sine oscillations of the rectangular duct is obtained by graphical illustrations for different parameters. moreover, the graphs are sketched for the velocity.

关键词： maxwell fluid oscillating rectangular duct velocity field

Study of Thermal Reactivity and Kinetics of HmX and Its PBX by Different methods

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火炸药学报 2017年第2期40卷 24-32页

作者： mohamed Abd-Elghany Thomas m.Klapotke Ahmed Elbeih saeed Hassanein Tamer Elshenawy Department Chemie Ludwig-Maximilians Universitat Munchen 81377 Munchen Germany military Technical College Kobry Elkobbah Cairo Egypt Technical Research Center Cairo Egypt

Vacuum Stability Test(VST)was used to determine the thermal behavior and kinetic parameters of 1,3,5,7-tetranitro-1,3,5,7-tetrazocine(HmX)and its mixture with hydroxyl-terminated polybutadiene(HTPB)as a binder coded as HmX/*** fitting and isoconversional method were applied to determine the kinetic parameters based on VST *** comparison,non-isothermal thermogravimetry analysis data(TGA)was also used to calculate the kinetic parameters by using Kissinger,OFW(Ozawa,Flynn,and Wall)and KAS(Kissinger-Akahira-Sunose)*** Kinetics and Technology Solution(AKTS)software was also used to determine the decomposition kinetics of the studied *** Scanning Calorimetry(DSC)was employed to determine the decomposition heat flow properties of the studied *** show that the activation energies obtained using VST results is 360.1kJ/mol for pure HmX and 186.9kJ/mol for HmX/*** activation energies obtained by the three different methods using TGA results are in the range of 360-368kJ/mol for pure HmX and 190-206kJ/mol for HmX/*** is concluded that values of kinetic parameters obtained by VST are close to that obtained by the different techniques using TG/DTG *** onset decomposition peak of HmX/HTPB is lower than that of HmX where the HTPB binder has negative effect on the thermal stability of *** results of all the applied techniques prove that HmX/HTPB has lower activation energy and heat release than the pure *** polymeric matrix has negative effect on the kinetic parameters of HmX.

关键词： HmX HmX/HTPB 火炸药质量管理研究工作 PBX

An autoregressive integrated moving average model for short-term prediction of hepatitis C virus seropositivity among male volunteer blood donors in Karachi,Pakistan

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World Journal of Gastroenterology 2009年第13期15卷 1607-1612页

作者： saeed Akhtar Shafquat Rozi Department of Community medicine and Behavioral Sciences Faculty of MedicineKuwait University Department of Community Health Sciences Medical CollegeAga Khan University

AIm： To identify the stochastic autoregressive integrated moving average （ARImA） model for short term forecasting of hepatitis C virus （HCV） seropositivity among volunteer blood donors in Karachi, Pakistan.mETHODS： Ninety-six months （1998-2005） data on HCV seropositive cases （1000-1 x month1） among male volunteer blood donors tested at four major blood banks in Karachi, Pakistan were subjected to ARImA modeling. Subsequently, a fitted ARImA model was used to forecast HCV seropositive donors for 91-96 mo to contrast with observed series of the same months. To assess the forecast accuracy, the mean absolute error rate （%） between the observed and predicted HCV seroprevalence was calculated. Finally, a fitted ARImA model was used for short-term forecasts beyond the observed series.RESULTS： The goodness-of-fit test of the optimum ARImA （2,1,7） model showed non-significant autocorrelations in the residuals of the model. The forecasts by ARImA for 91-96 mo closely followed the pattern of observed series for the same months, with mean monthly absolute forecast errors （%） over 6 mo of 6.5%. The short-term forecasts beyond the observed series adequately captured the pattern in the data and showed increasing tendency of HCV seropositivity with a mean ± SD HCV seroprevalence （1000^-1× month^-1） of 24.3 ±1.4 over the forecast interval.CONCLUSION： To curtail HCV spread, public health authorities need to educate communities and health care providers about HCV transmission routes based on known HCV epidemiology in Pakistan and its neighboring countries. Future research may focus on factors associated with hyperendemic levels of HCV infection.

关键词： Hepatitis C virus Blood donor Ecologicalanalysis Autoregressive integrated moving averagemodel Pakistan