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Does delayed gastric emptying shorten the H pylori eradication period? A double blind clinical trial

World Journal of Gastroenterology 2006年第39期12卷 6310-6315页

作者： Mohammad Hassan Emami Mohammad Mehdi Saberfiroozi Abbas Arj Ali Reza Taghavi Kamran Bagheri-Lankarani Najaf Dehbashi Mohammad Reza Fattahi Mahvash Alizadeh Mohammad Javad Kaviani rahim bahri-najafi Bita Geramizadeh Abbas Esmaeili Gastroenterologist Isfahan University of Medical Sciences Poursina Hakim Research Institute Isfahan Iran Gastroenterologist Namazi University Hospital School of Medicine Shiraz University of Medical Sciences Isfahan Iran Gastroenterologist School of Medicine Kashan University of Medical Sciences Isfahan Iran Clinical Pharmacist Pharmaceutical School Shiraz University of Medical Sciences Shiraz Iran General Practitioner Poursina Hakim Research Institute Isfahan Iran

AIM: To evaluate the gastric emptying inhibitory effects of sugar and levodopa on H pylori eradication period. METHODS: A total of 139 consecutive patients were randomized into 6 groups. The participants with peptic ulcer disease or non-ulcer dyspepsia non-responding to other medications who were also H pylori-positive patients either with positive rapid urease test (RUT) or positive histology were included. All groups were pretreated with omeprazole for 2 d and then treated with quadruple therapy regimen (omeprazole, bismuth, tetracycline and metronidazole); all drugs were given twice daily. Groups 1 and 2 were treated for 3 d, groups 3, 4 and 5 for 7 d, and group 6 for 14 d. Groups 1 to 4 received sugar in the form of 10% sucrose syrup. Levodopa was prescribed for groups 1 and 3. Patients in groups 2 and 4 were given placebo for levodopa and groups 5 and 6 received placebos for both sugar and levodopa. Upper endoscopy and biopsies were carried out before treatment and two months after treatment. Eradication of H pylori was assessed by RUT and histology 8 wk ***: Thirty patients were excluded. Per-protocol analysis showed successful eradication in 53% in group 1, 56% in group 2, 58% in group 3, 33.3% in group 4, 28% in group 5, and 53% in group 6. Eradication rate, patient compliance and satisfaction were not significantly different between the groups. CONCLUSION: It seems that adding sugar or levodopa or both to anti H pylori eradication regimens may lead to shorter duration of treatment.

关键词： Hpylori Gastric emptying Glucose Levodopa

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Effect of residual structural strain caused by the addition of Co3O4 nanoparticles on the structural, hardness and magnetic properties of an Al/Co3O4 nanocomposite produced by powder metallurgy

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International Journal of Minerals,Metallurgy and Materials 2020年第3期27卷 384-390页

作者： Seyed rahim Kiahosseini Hossein Ahmadian Department of Engineering Damghan Branch Islamic Azad University

Al composites are of interest due to their appropriate ratio of strength to *** our research,an Al/Co3O4 nanocomposite was generated using a sintering *** powders of Al with various Co3O4 nanoparticle contents(0 wt%,0.5 wt%,1.0 wt%,1.5 wt%,2.0 wt%,and2.5 wt%)were first blended using planetary milling for 30 min,and compressed in a cylindrical steel mold with a diameter of 1 cm and a height of5 cm at a pressure of 80 *** samples were evaluated with X-ray diffractometry(XRD),scanning electron microscopy(SEM),Vickers hardness,and a vibrating sample magnetometer(VSM).Although the crystallite size of the Al particles remained constant at 7–10 nm,the accumulation of nanoparticles in the Al particle interspace increased the structural tensile strain from 0.0045 to 0.0063,the hardness from HV 28 to HV 52 and the magnetic saturation from 0.044 to 0.404 emu/g with an increase in Co3O4 nanoparticle content from 0 wt%to 2.5 wt%.

关键词： Residual strain Vickers hardness vibrating sample magnetometer scanning electron microscopy

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Investigation of the Effects of Baffles on the Shallow Water Sloshing in A Rectangular Tank Using A 2D Turbulent ISPH Method

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China Ocean Engineering 2019年第1期33卷 94-102页

作者： rahim SHAMSODDINI Bahador ABOLPUR Department of Mechanical Engineering Sirjan University of Technology Department of Chemical Engineering Sirjan University of Technology

Liquid sloshing is a common phenomenon in the liquid tanks transportation. Liquid waves lead to fluctuating forces on the tank wall. Uncontrolled fluctuations lead to large forces and momentums. Baffles can control these fluctuations. A numerical method, which has been widely used to model this phenomenon, is Smoothed Particle Hydrodynamics(SPH). The Lagrangian nature of this method makes it suitable for simulating free surface flows. In the present study, an accurate Incompressible Smoothed Particle Hydrodynamics(ISPH) method is developed and improved using the kernel gradient correction tensors, particle shifting algorithms, k–ε turbulence model, and free surface particle detectors. Comparisons with the experimental data approve the ability of the present algorithm for simulating shallow water sloshing. The main aim of this study is to investigate the effects of the vertical baffle on the damping of liquid sloshing. Results show that baffles number has a major role in sloshing fluctuation damping.

关键词： SPH k–ε vertical baffle shallow water sloshing free surface

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Neural network and principal component regression in non-destructive soluble solids content assessment:a comparison

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2012年第2期13卷 145-151页

作者： Kim-seng CHIA Herlina ABDUL rahim Ruzairi ABDUL rahim Department of Control and Instrumentation Faculty of Electrical EngineeringUniversiti Teknologi Malaysia

Visible and near infrared spectroscopy is a non-destructive,green,and rapid technology that can be utilized to estimate the components of interest without conditioning it,as compared with classical analytical *** objective of this paper is to compare the performance of artificial neural network(ANN)(a nonlinear model)and principal component regression(PCR)(a linear model)based on visible and shortwave near infrared(VIS-SWNIR)(400-1000 nm)spectra in the non-destructive soluble solids content measurement of an ***,we used multiplicative scattering correction to pre-process the spectral ***,PCR was applied to estimate the optimal number of input ***,the input variables with an optimal amount were used as the inputs of both multiple linear regression and ANN *** initial weights and the number of hidden neurons were adjusted to optimize the performance of *** suggest that the predictive performance of ANN with two hidden neurons outperforms that of PCR.

关键词： Artificial neural network (ANN) Principal component regression (PCR) Visible and shortwave nearinfrared (VIS-SWNIR) Spectroscopy Apple Soluble solids content (SSC)

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Full-Quantum Simulation of Graphene Self-Switching Diodes

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Chinese Physics Letters 2019年第6期36卷 53-56页

作者： Ashkan Horri rahim Faez Department of Electrical Engineering Arak Branch Islamic Azad University Arak Department of Electrical Engineering Tehran Sharif University of Technology

We present a quantum study on the electrical behavior of the self-switching diode(SSD). Our simulation is based on non-equilibrium Green's function formalism along with an atomistic tight-binding model. Using this method,electrical characteristics of devices, such as turn-on voltage, rectification ratio, and differential resistance, are investigated. Also, the effects of geometrical variations on the electrical parameters of SSDs are simulated. The carrier distribution inside the nano-channel is successfully simulated in a two-dimensional model under zero,reverse, and forward bias conditions. The results indicate that the turn-on voltage, rectification ratio, and differential resistance can be optimized by choosing appropriate geometrical parameters.

关键词： Full-Quantum Simulation Graphene Self-Switching Diodes

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Cohen-Macaulay Lexsegment Complexes in Arbitrary Codimension

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Algebra Colloquium 2017年第3期24卷 401-406页

作者： Siamak Yassemi rahim Zaare-Nahandi School of Mathematics Statistics & Computer Science University of Tehran Tehran Iran

We characterize pure lexsegment complexes which are Cohen-Macaulay in arbitrary codimension. More precisely, we prove that any lexsegment complex is Cohen- Macaulay if and only if it is pure and its 1-dimensional links are connected, and that a lexsegment flag complex is Cohen-Macaulay if and only if it is pure and connected. We show that any non-Cohen-Macaulay lexsegment complex is a Buchsbaum complex if and only if it is a pure disconnected flag complex. For t≥2, a lexsegment complex is strictly Cohen-Macaulay in codimension t if and only if it is the join of a lexsegment pure discon- nected flag complex with a （t - 2）-dimensional simplex. When the Stanley-Reisner ideal of a pure lexsegment complex is not quadratic, the complex is Cohen-Macaulay if and only if it is Cohen-Macaulay in some codimension. Our results are based on a characterization of Cohen-Macaulay and Buchsbaum lexsegment complexes by Bonanzinga, Sorrenti and Terai.

关键词： squarefree lexsegment ideal Cohen-Macaulay complex Buchsbaum complex,flag complex CMt complex

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Correction of failure in antenna array using matrix pencil technique

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Chinese Physics B 2017年第6期26卷 491-498页

作者： S U Khan M K A rahim Advanced RF & Microwave Research Group Department of Communication Engineering Faculty of Electrical Engineering Universiti Teknologi Malaysia 81310 Skudai Johor Malaysia

In this paper a non-iterative technique is developed for the correction of faulty antenna array based on matrix pencil technique（MPT）. The failure of a sensor in antenna array can damage the radiation power pattern in terms of sidelobes level and nulls. In the developed technique, the radiation pattern of the array is sampled to form discrete power pattern information set. Then this information set can be arranged in the form of Hankel matrix（HM） and execute the singular value decomposition（SVD）. By removing nonprincipal values, we obtain an optimum lower rank estimation of HM. This lower rank matrix corresponds to the corrected pattern. Then the proposed technique is employed to recover the weight excitation and position allocations from the estimated matrix. Numerical simulations confirm the efficiency of the proposed technique, which is compared with the available techniques in terms of sidelobes level and nulls.

关键词： array correction low rank estimation matrix pencil technique singular value decomposition

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On Non-standard Hilbert Functions

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Algebra Colloquium 2018年第1期25卷 71-80页

作者： Amir Bagheri rahim Rahmati-Asghar Marand Technical Coflege University of Tabriz Tabriz Iran School of Mathematics Institute for Research in Fundamental Sciences (IPM) Department of Mathematics Faculty of Basic Sciences University of Maragheh

. Let S = k[x1,..., xn] be a non-standard polynomial ring over a field k and let M be a finitely generated graded S-module. In this paper, we investigate the behaviour of Hilbert function of M and its relations with lattice point counting. More precisely, by using combinatorial tools, we prove that there exists a polytope such that the image of Hilbert function in some degree is equal to the number of lattice points of this polytope.

关键词： polynomial ring non-standard Hilbert function Hermite normal form

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Modeling of shear wave velocity in limestone by soft computing methods

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International Journal of Mining Science and Technology 2017年第3期27卷 423-430页

作者： Behnia Danial Ahangari Kaveh Moeinossadat Sayed rahim Department of Mining Engineering Science and Research Branch Islamic Azad University Tehran *** Iran

The main purpose of current study is development of an intelligent model for estimation of shear wave velocity in limestone. Shear wave velocity is one of the most important rock dynamic parameters. Because rocks have complicated structure, direct determination of this parameter takes time, spends expenditure and requires accuracy. On the other hand, there are no precise equations for indirect determination of it; most of them are empirical. By using data sets of several dams of Iran and neuro-genetic, adaptive neuro-fuzzy inference system （ANFIS）, and gene expression programming （GEP） methods, models are rendered for prediction of shear wave velocity in limestone. Totally, 516 sets of data has been used for modeling. From these data sets, 413 ones have been utilized for building the intelligent model, and 103 have been used for their performance evaluation. Compressional wave velocity （Vp）, density （7） and porosity （.n）, were considered as input parameters. Respectively, the amount of R for neuro-genetic and ANFIS networks was 0.959 and 0.963. In addition, by using GEP, three equations are obtained; the best of them has 0.958R. ANFIS shows the best prediction results, whereas GEP indicates proper equations. Because these equations have accuracy, they could be used for prediction of shear wave velocity for limestone in the future.

关键词： Shear wave velocity Limestone Neuro-genetic Adaptive neuro-fuzzy inference system Gene expression programming

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Cretaceous Carbonate Deposits of Neotethys Ocean in the Northwest of Iran

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Journal of Earth Science 2017年第3期28卷 555-562页

作者： rahim Mahari Somaieh Sadigh Janbehan Geology Department Faculty of SciencesTabriz BranchIslamic Azad UniversityTabriz 51368lran

Cretaceous carbonate deposits are considerably extensively distributed in the northwest of Iran and form most of the paleohighs of the region and different Cenozoic sedimentary units have deposited over these units with angular unconformity. Cretaceous stratigraphic units of northwestern Iran can be divided into three main categories： clastic, shallow carbonate and pelagic. Clastic facies include conglomerate, breccia and fine-grained clastic groups and carbonate facies are composed of series of microfacies of open sea（A）, bar（B）, lagoon（C）, and tidal flat. Relatively deep carbonate deposits with different trace fossils are also indications of deeper parts of the Cretaceous sedimentary environments in the northwest of Iran. With reference to the expansion of narrow Neotethys Ocean（Khoy-Zanjan）, shelf margin sedimentary environments of Neotethys Ocean can be assumed for the Azarshahr-Tabriz region, where flysch and clastics facies in the coasts of Varaghan deposited towards the northern parts with increase of depth. Investigation on the expansion of narrow Neotethys Ocean by using different sedimentary facies during the present study is considered as an important step to complete paleogeographic data of Cretaceous time in the northwestern region of Iran and Middle East.

关键词： Cretaceous Neotethys Ocean sedimentary basin sedimentary facies Azerbaijan Iran

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