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Study of the duodenal contractile activity during antral contractions

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World Journal of Gastroenterology 2007年第18期13卷 2600-2603页

作者： Ahmed Shafik Olfat El Sibai Ali A Shafik Department of Surgery and Experimental Research Faculty of Medicine Cairo University Cairo Egypt Department of Surgery Faculty of Medicine Menoufia University Shebin El-Kom Egypt

AIM： To investigate the hypothesis that duodenal bulb （DB） inhibition on pyloric antrum （PA） contraction is reflex. METHODS： Balloon （condom）-tipped tube was introduced into 1^st duodenum （DD） and a manometric tube into each of PA and DD. Duodenal and antral pressure response to duodenal and then PA balloon distension with saline was recorded. These tests were repeated after separate anesthetization of DD and PA. RESULTS： Two and 4 mL of 1^st DD balloon distension produced no pressure changes in DD or PA （10.7±1.2 vs 9.8±1.2, 11.2±1.2 vs 11.3±1.2 on H20 respectively, P〉0.05）. Six mL distension effected 1^st DD pressure rise （30.6±3.4 cm H20, P 〈0.01） and PA pressure decrease （6.2±1.4 cm H20, P〈0.05）; no response in 2^nd, 3^rd and 4^th DD. There was no difference between 6, 8, and 10 mL distensions. Ten mL PA distension produced no PA or 1^st DD pressure changes （P〉 0.05）. Twenty mL distension increased PA pressure （92.4 4±10.7 cm H20, P〈0.01） and decreased 1^st DD pressure （1.6±0.3 cm H20, P〈0.01）; 30, 40, and 50 mL distension produced the same effect as the 20 mL distension （P 〉 0.05）. PA or DD distension after separate anesthetization produced no significant pressure changes in PA or DD. CONCLUSION： Large volume DD distension produced DD pressure rise denoting DD contraction and PA pressure decline denoting PA relaxation. PA relaxation upon DD contraction is postulated to be mediated through a reflex which we call duodeno-antral reflex. Meanwhile, PA distension effected DD relaxation which we suggest to be reflex and termed antro-duodenal reflex. It is suggested that these 2 reflexes, could act as investigative tools in diagnosis of gastroduodenal motility disorders.

关键词： Duodenal bulb Gastroduodenal disorders Reflex Pyloric antrum Motility

Association of serum levels of epidermal growth factor with disease severity in patients with unresectable hepatocellular carcinoma

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Hepatoma Research 2016年第1期2卷 18-25页

作者： Mohamed Ahmed Samy Kohla Om Kolsoum Al-Haddad Ali Nada Mohamed Al-Warraky Manar Obada Mohamed Amer Sameera Ezzat Ashraf Abou Gabal Department of Hepatology National Liver InstituteMenoufia University32511 MenoufiaEgypt Department of Radiology National Liver InstituteMenoufia University32511 MenoufiaEgypt Department of Clinical Biochemistry National Liver InstituteMenoufia University32511 MenoufiaEgypt Department of Epidemiology National Liver InstituteMenoufia University32511 MenoufiaEgypt

Aim:Epidermal growth factor(EGF)is a mitogen for hepatocyte grown in vitro,and its expression is up-regulated during liver *** also plays an important role in tumor initiation and *** goal of this study is to assess whether EGF is associated with advanced hepatocellular carcinoma(HCC)and also whether it is a predictive factor of shortened ***:Serum EGF levels were evaluated in a total of 151 subjects:51 patients with unresectable HCC,(21 of them were eligible for transarterial chemoembolization(TACE)and serum EGF levels were measured before and 1 week after TACE),40 patients with chronic hepatitis without cirrhosis,40 patients with cirrhosis,and 20 healthy *** demographic and laboratory variables were evaluated as predictive factors of survival in a Cox regression multivariate analysis using SPSS ***:The mean serum level of EGF in patients with HCC was 784.49 pg/mL,which was significantly higher(P<0.05)than all other *** EGF level in cirrhotic patients was 144.69 pg/mL;in those with chronic hepatitis C without cirrhosis,it was 338.64 pg/mL;and in healthy controls,it was 297.15 pg/*** group Ia patients who underwent TACE,the mean serum level of EGF was 759.76±287.88 pg/mL before TACE,and 801.14±276.12 pg/mL 1 week after treatment(P=0.34).On multivariate Cox regression analysis only age(P=0.03)and higher serum EGF level(P=0.005),were inversely correlated with overall ***:EGF levels were found to be significantly higher in HCC patients and together with age were the only predictors of poor survival in these *** was an increase in EGF levels 1 week after TACE in response to hypoxia;however,this increase was not statistically significant.

关键词： Cirrhosis epidermal growth factor hepatocellular carcinoma survival transarterial chemoembolization

Hydrogen Bonding in Hydrogenated Amorphous Germanium

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Tsinghua Science and Technology 2004年第2期9卷 177-180页

作者： M. S. Abo-Ghazala S. Al Hazmy Physics Department Faculty of Science Menoufia University Sheben El-Koom EgyptChemistry Department Faculty of Science Sana University Yemen

Thin films of hydrogenated amorphous germanium (a-Ge:H) were prepared by radio frequency glow discharge deposition at various substrate temperatures. The hydrogen distribution and bonding struc-ture in a-Ge:H were discussed based on infrared absorption data. The correlation between infrared absorp-tion spectra and hydrogen effusion measurements was used to determine the proportionality constant for each vibration mode of the Ge-H bonds. The results reveal that the bending mode appearing at 835 cm1 is associated with the Ge-H2 (dihydride) groups on the internal surfaces of voids. While 1880 cm1 is assigned to vibrations of Ge-H (monohydride) groups in the bulk, the 2000 cm1 stretching mode is attributed to Ge-H and Ge-H2 bonds located on the surfaces of voids. For films associated with bending modes in the infrared spectra, the proportionality constant values of the stretching modes near 1880 and 2000 cm1 are found to be lower than those of films which had no corresponding bending modes.

关键词： hydrogenated amorphous germanium hydrogen bonding film

Correlation between Left Ventricular End Diastolic Pressure and Torsion Dynamics in Patients with Diastolic Dysfunction, Speckle Tracking Imaging Study

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World Journal of Cardiovascular Diseases 2019年第2期9卷 81-91页

作者： Ahmed Emara Mahmoud Kamel Said Shalaby Wesam El Shafay Ahmed Abd El-Razzak Department of Cardiology Menoufia University Menoufia City Egypt

Background: Invasive measuring of LV end diastolic pressure (LVEDP) provides reliable assessment of LV diastolic dysfunction, but its invasive nature limits its use in daily practice. Accurate noninvasive assessment of LV diastolic dysfunction is highly desirable, and the relationship between the degree of LVEDP and LV torsion dynamics assessed by 2D speckle tracking is not clearly assessed;here in our study we aimed to assess the relation between the degree of LVEDP and torsion dynamics of left ventricle. Methods: The study included sixty patients divided equally into 3 groups according to the degree of LVEDP, group I: mmHg, group II: 12 - 18 mmHg, and group III: >18 mmHg;complete conventional echo-Doppler study includes also annular septal E wave peak velocity, E/E’ ratio and 2D-speckle tracking including parameters of LV global longitudinal strain (GLS), peak and time to peak of twist ratio (TR & TT respectively), peak and time to peak of untwist ratio (UTR & UTT respectively). Results: There was significant progressive decrease in GLS with progressive increase in LVEDP from I to III. Untwist ratio increased in group II and decreased in significant degree in group III;Twist ratio did not differ with different grades of LVEDP. LA diameter and E/E’ increase from group I to III. The LVEDP is negatively correlated with the UTR and GLS is positively correlated with UTT, E/E & LA diameter. The E/E’ ratio is correlated negatively with the UTR, GLS and positively with LVEDP & UTT and LA diameter. Conclusions: Noninvasive assessment of LV torsion and untwisting was feasible in patients with various grades of LVEDP and diastolic dysfunction;the peak untwist ratio increased in mild degree of increased LVEDP then decreased again with more increase in LVEDP;LVEDP wasnegatively correlated with the peak untwist ratio and GLS was positively correlated with UTT and E/E’.

关键词： Diastolic Dysfunction LV End Diastolic Pressure Torsion Dynamic

Duodeno-jejunal junction dyssynergia: Description of a novel syndrome

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World Journal of Gastroenterology 2007年第30期13卷 4112-4116页

作者： Ahmed Shafik Ismail A Shafik Olfat El Sibai Ali A Shafik Department of Surgery and Experimental Research Faculty of Medicine Cairo University Cairo Egypt Department of Surgery Faculty of Medicine Menoufia University Shebin El-Kom Egypt

AIM： To investigate the hypothesis that duodeno-jejunal dyssynergia existed at the duodeno-jejunal junction.METHODS： Of 112 patients who complained of epigastric distension and discomfort after meals, we encountered nine patients in whom the duodeno-jejunal junction did not open on duodenal contraction. Seven healthy volunteers were included in the study. A condom which was inserted into the ist duodenum was filled up to 10 mL with saline in increments of 2 mL and pressure response to duodenal distension was recorded from the duodenum, duodeno-jejunal junction and the jejunum.RESULTS： In healthy volunteers, duodenal distension with 2 and 4 mL did not produce pressure changes, while 6 and up to 10 mL distension effected significant duodenal pressure increase, duodeno-jejunal junction pressure decrease but no jejunal pressure change. In patients, resting pressure and duodeno-jejunal junction and jejunal pressure response to 2 and 4 mL duodenal distension were similar to those of healthy volunteers. Six and up to 10 mL 1^st duodenal distension produced significant duodenal and duodeno-jejunal junction pressure increase and no jejunal pressure change.CONCLUSION： Duodeno-jejunal junction failed to open on duodenal contraction, a condition we call ＇duodenojejunal junction dyssynergia syndrome＇ which probably leads to stagnation of chyme in the duodenum and explains patients＇ manifestations.

关键词： Epigastric distension Vomiting Nausea Dyspepsia Chyme

On Network Designs with Coding Error Detection and Correction Application

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Computers, Materials & Continua 2021年第6期67卷 3401-3418页

作者： Mahmoud Higazy Taher A.Nofal Department of Mathematics and Statistics College of ScienceTaif UniversityTaif21944Saudi Arabia Department of Physics and Engineering Mathematics Faculty of Electronic EngineeringMenoufia UniversityMenouf32952Egypt

The detection of error and its correction is an important area of mathematics that is vastly constructed in all communication ***,combinatorial design theory has several applications like detecting or correcting errors in communication ***(graph)designs(GDs)are introduced as a generalization of the symmetric balanced incomplete block designs(BIBDs)that are utilized directly in the above mentioned *** networks(graphs)have been represented by vectors whose entries are the labels of the vertices related to the lengths of edges linked to ***,a general method is proposed and applied to construct new networks *** method of networks representation has simplified the method of constructing the network *** this paper,a novel representation of networks is introduced and used as a technique of constructing the group generated network designs of the complete bipartite networks and certain circulants.A technique of constructing the group generated network designs of the circulants is given with group generated graph designs(GDs)of certain *** addition,the GDs are transformed into an incidence matrices,the rows and the columns of these matrices can be both viewed as a binary nonlinear code.A novel coding error detection and correction application is proposed and examined.

关键词： Network decomposition network designs network edge covering circulant graphs

A Fractional Fourier Based Medical Image Authentication Approach

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Computers, Materials & Continua 2022年第2期70卷 3133-3150页

作者： Fayez Alqahtani Mohammed Amoon Walid El-Shafai Department of Software Engineering College of Computer and Information SciencesKing Saud UniversityRiyadh11451Saudi Arabia Department of Computer Science Community CollegeKing Saud UniversityRiyadh11437Saudi Arabia Department of Computer Science and Engineering Faculty of Electronic EngineeringMenoufia UniversityMenouf32952Egypt Department of Electronics and Electrical Communications Engineering Faculty of Electronic EngineeringMenoufia UniversityMenouf32952Egypt

Patient medical information in all forms is crucial to keep private and secure,particularly when medical data communication occurs through insecure ***,there is a bad need for protecting and securing the color medical images against impostors and *** this paper,an optical medical image security approach is *** is based on the optical bit-plane Jigsaw Transform(JT)and Fractional Fourier Transform(FFT).Different kernels with a lone lens and a single arbitrary phase code are exploited in this security approach.A preceding bit-plane scrambling process is conducted on the input color medical images prior to the JT and FFT processes to accomplish a tremendous level of robustness and *** confirm the efficiency of the suggested security approach for secure color medical image communication,various assessments on different color medical images are examined based on different statistical security ***,a comparative analysis is introduced between the suggested security approach and other conventional cryptography *** simulation outcomes acquired for performance assessment demonstrate that the suggested security approach is highly *** has excellent encryption/decryption performance and superior security results compared to conventional cryptography approaches with achieving recommended values of average entropy and correlation coefficient of 7.63 and 0.0103 for encrypted images.

关键词： Medical image security encryption JT FFT cryptosystem

Security Analysis for SCKHA Algorithm:Stream Cipher Algorithm Based on Key Hashing Technique

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Chinese Journal of Electronics 2022年 1-16页

作者： Souror Samia El-Fishawy Nawal Badawy Mohammed Department of Computer Science and Engineering Faculty of Electronic Engineering Menoufia University

The strength of any cryptographic algorithm is mostly based on the difficulty of its encryption key. However, the larger size of the shared key the more computational operations and processing time for cryptographic algorithms. To avoid increasing the key size and keep its secrecy, we must hide it. The authors proposed a stream cipher algorithm that can hide the symmetric key[1]through hashing and splitting techniques. This paper aims to measure security analysis and performance assessment for this algorithm. This algorithm is compared with three of the commonly used stream cipher algorithms: RC4, Rabbit, and Salsa20 in terms of execution time and throughput. This comparison has been conducted with different data types as audio, image, text,docs, and pdf. Experiments proved the superiority of SCKHA algorithm over both Salsa20 and Rabbit algorithms. Also, results proved the difficulty to recover the secret key for SCKHA algorithm. Although RC4 has a lower encryption time than SCKHA, it is not recommended for use because of its vulnerabilities. Security factors that affect the performance as avalanche effect, correlation analysis, histogram analysis, and Shannon information entropy are highlighted. Also, the ciphertext format of the algorithm gives it the ability to search over encrypted data.

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Modeling Rogowski Coils for Monitoring Surge Arrester Discharge Currents

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Computer Systems Science & Engineering 2022年第8期42卷 439-449页

作者： Nehmdoh A.Sabiha Hend I.Alkhammash Department of Electrical Engineering Faculty of EngineeringMenoufia University32511Shebin ElkomEgypt Department of Electrical Engineering College of EngineeringTaif University21944TaifSaudi Arabia

Rogowski coils(RCs)are widely used to measure power or high frequency currents based on their *** this paper,two types of RCs that are circular(traditional)and cylindrical shapes wound using wire covered by varnish are *** construction is carried out to be suitable for monitoring the discharge current of the surge arrester installed in the distribution *** high frequency RC modeling for both types considering transfer function is ***-integrating for both types is ***,the experimental tests using function generator for both coils are carried out to identify the parameters of the transfer function representing the introduced *** measured signals for current and induced voltages are denoised for the parameter identification *** denoised process is achieved using the MATLAB code‘wdenoise’while the parameters are estimated using the system identification *** of the proposed model is achieved using experimental results for the two *** sensitivity of the two coils is investigated based on the induced output *** application concerning the two coils for monitoring the discharge current of the surge arrester is *** results confirm the accuracy of the introduced RC model,as well as the performance of the cylindrical shape,is better than the traditional *** simulation is carried out using MATLAB and ATPDraw programs.

关键词： Rogowski coil surge arrester discharge current frequency response parameters dentification denoised signal