检索结果-南通市图书馆

Use of anti tumor necrosis factor-alpha monoclonal antibody for ulcerative jejunoileitis

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2012年第36期18卷 5135-5137页

作者： Gulseren Seven adel Assaad Thomas Biehl Richard A Kozarek Digestive Disease Institute Virginia Mason Medical CenterSeattleWA 98101United States Department of Pathology Virginia Mason Medical CenterSeattleWA 98101United States Department of General Thoracic and Vascular SurgeryVirginia Mason Medical CenterSeattleWA 98101United States

Ulcerative jejunoileitis is an uncommon clinical syndrome consisting of abdominal pain,weight loss associated with diarrhea,and multiple inflammatory ulcerations and strictures of the small *** jejunoileitis can complicate established celiac disease or develop in patients de *** levels of tumor necrosis factor-alpha(TNF-α) in the small intestine of patients with untreated celiac disease are associated with a role in the immune pathogenesis of this *** specific therapy has been shown to change the course of ulcerative *** report a case of severe ulcerative jejunoileitis previously unresponsive to traditional therapies,including high dose corticosteroids and *** patient had a dramatic resolution of symptoms and a complete normalization of endoscopic findings after anti-TNF-α monoclonal antibody,infliximab(Remicade).

关键词： Ulcerative jejunoileitis Biologic therapy Tumor necrosis factor-alpha Infliximab

Developed mathematical technique for fractional stochastic point kinetics model in nuclear reactor dynamics

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2018年第9期29卷 197-213页

作者： Ahmed E.Aboanber Abdallah A.Nahla adel M.Edress Department of Mathematics Faculty of Science Taibah University Department of Mathematics Faculty of Science Tanta University

Fractional stochastic kinetics equations have proven to be valuable tools for the point reactor kinetics model, where the nuclear reactions are not fully described by deterministic relations. A fractional stochastic model for the point kinetics system with multi-group of precursors,including the effect of temperature feedback, has been developed and analyzed. A major mathematical and inflexible scheme to the point kinetics model is obtained by merging the fractional and stochastic technique. A novel split-step method including mathematical tools of the Laplace transforms, Mittage–Leffler function, eigenvalues of the coefficient matrix, and its corresponding eigenvectors have been used for the fractional stochastic matrix differential equation. The validity of the proposed technique has been demonstrated via calculations of the mean and standard deviation of neutrons and precursor populations for various reactivities: step, ramp, sinusoidal, and temperature reactivity feedback. The results of the proposed method agree well with the conventional one of the deterministic point kinetics equations.

关键词： Ito stochastic point kinetics equations Temperature feedback effects Wiener process Fractional calculus Mittage–Leffler function

Estimating oak forest parameters in the western mountains of Iran using satellite-based vegetation indices

在线全文

学校读者我要写书评

暂无评论

Journal of Forestry Research 2020年第2期31卷 541-552页

作者： adel Nouri Bahman Kiani Mohammad Hossein Hakimi Mohammad Hossein Mokhtari Department of Forest Sciences Faculty of Natural ResourcesYazd UniversityYazdIslamic Republic of Iran Department of Desert Management Faculty of Natural ResourcesYazd UniversityYazdIslamic Republic of Iran

Remote sensing is an important tool for studying and modeling forest *** indices obtained from Landsat-8 remotely sensed data were used to estimate the forest parameters in the western mountains of *** sample points were selected on the map of Bayangan County,Kermanshah province,*** each point,a cluster of five rectangular plots of 8100 m2 and 200 m apart was *** clusters were primarily sampled to determine the variance of the forest *** coefficient of variation was used as a criterion for sample *** density,canopy cover and basal area per hectare were calculated for each *** indices were extracted fromthe Landsat-8 images for each *** linear and nonlinear regressions were conducted to develop the *** models were validated using an independent data *** of model parameters was statistically *** results showed that Normalized difference vegetation index(NDVI)and Transformed normalized difference vegetation index(TNDVI)followed by Simple ratio vegetation index(SRVI)were the best predictors,explaining up to 91%of the variations with high *** NDVI,Soil adjusted vegetation index 2(SAVI2)and SRVI,the cubic model was more appropriate than the linear model for predicting the forest *** this model,the R-square value increased while NRMSE decreased *** Infrared percentage vegetation index(IPVI),the quadratic model was better,but,for other vegetation indices,nonlinear models were not superior to linear ***,it can be concluded that Landsat-8 imagery is suitable for predicting forest parameters in the oak forests of western *** course,large plots must be selected,and pre-classification is necessary to gain accurate and precise estimations.

关键词： Basal area Canopy cover Density Landsat-8 Modeling

Adaptive Fault Tolerant Control of Multi-time-scale Singularly Perturbed Systems

在线全文

学校读者我要写书评

暂无评论

International Journal of Automation and computing 2018年第6期15卷 736-746页

作者： adel Tellili Nouceyba Abdelkrim Amina Challouf Mohamed Naceur Abdelkrim Research Unit MACS University of Gabes Gabes Tunisia Higher Institute of Industrial Systems at Gabes University of Gabes Gabes Tunisia Higher Institute of Technological Studies at Djerba Djerba Tunisia National School of Engineers of Gabes University of Gabes Gabes Tunisia

This paper studies the fault tolerant control, adaptive approach, for linear time-invariant two-time-scale and three-time-scale singularly perturbed systems in presence of actuator faults and external disturbances. First, the full order system will be controlled using v-dependent control law. The corresponding Lyapunov equation is ill-conditioned due to the presence of slow and fast phenomena. Secondly, a time-scale decomposition of the Lyapunov equation is carried out using singular perturbation method to avoid the numerical stiffness. A composite control law based on local controllers of the slow and fast subsystems is also used to make the control law ε-independent. The designed fault tolerant control guarantees the robust stability of the global closed-loop singularly perturbed system despite loss of effectiveness of actuators. The stability is proved based on the Lyapunov stability theory in the case where the singular perturbation parameter is sufficiently small. A numerical example is provided to illustrate the proposed method.

关键词： Singularly perturbed systems time scale decomposition adaptive fault tolerant control actuator fault Lyapunov equations

Computational investigation of hydraulic performance variation with geometry in gabion stepped spillways

在线全文

学校读者我要写书评

暂无评论

Water Science and Engineering 2019年第1期12卷 62-72页

作者： Dominic E.Reeve Ali adel Zuhaira Harshinie Karunarathna College of Engineering Swansea University

Over recent years, there has been a clear increase in the frequency of reported flooding events around the world. Gabion structures offer one means of flood mitigation in dam spillways. These types of structures provide an additional challenge to the computational modeller in that flow through the porous gabions must be simulated. We have used a computational model to investigate the flow over gabion stepped spillways. The model was first validated against published experimental results. Then, gabion stepped spillways with four different step geometries were tested under the same conditions in order to facilitate inter-comparisons and to choose the best option in terms of energy dissipation. The results show that normal gabion steps can dissipate more energy than overlap, inclined, and pooled steps. An intensive set of tests with varying slope, stone size, and porosity were undertaken. The location of the inception point and the water depth at this point obtained from this study were compared with those from existing formulae. Two new empirical equations have been derived, on the basis of a regression analysis, to provide improved results for gabion stepped spillways.

关键词： Computational modelling Energy dissipation Gabion stepped spillways Inception point location Skimming flow

The capability of Sentinel-2 image and FieldSpec3 for detecting lithium-containing minerals in central Iran

在线全文

学校读者我要写书评

暂无评论

Frontiers of Earth Science 2022年第3期16卷 678-695页

作者： Kazem RANGZAN Mostafa KABOLIZADEH Sajad ZAREIE adel SAKI Danya KARIMI Department of Remote Sensing and GIS Faculty of Earth SciencesShahid Chamran University of AhvazAhvaz ***Iran Department of Geology Faculty of Earth SciencesShahid Chamran University of AhvazAhvaz ***Iran

To date,there are very few studies about the spectroscopy of lithium-containing minerals(LCMs)in the scientific *** main objective of this study is to investigate the capability of Sentinel-2 image and FieldSpec3 spectro-radiometer in terms of mapping five important LCMs,including spodumene,lepidolite,amblygonite,petalite,and ***,first the FieldSpec3 spectro-radiometer was used to create the spectral curves of the ***,accurate spectral analysis and comparison of the studied LCMs were performed using The Spectral Geologist(TSG)and the Prism *** two software can show even slight difference in absorption features of different LCMs,which can discriminate and identify these ***-bearing rocks show absorption features at~365,~2200,and~2350 nm and reflective features at~550-770 *** features are consistent with Sentinel-2 ***,the created spectral curves were utilized for calibration of Sentinel-2 optical image to detect and map the potential zones of the rock units containing minerals mentioned above in a part of the central Iranian *** using the Spectral Angle Mapper(SAM)classifier module,the potential areas were *** of the five LCMs,petalite and spodumene showed more extensive coverage in the study *** speaking,the largest concentration of those LCMs can be seen in southern and centraleastern parts of the study *** comparison between spectral curves of reference and classified minerals confirmed the high capability of Sentinel-2 image for LCMs *** image classification results also confirmed the presence of the LCMs,but it cannot distinguish the LCMs type successfully.

关键词： FieldSpec3 spectro-radiometer lithium containing minerals Sentinel-2 ASTER Iran

The Dynamics and Control of the Fractional Forms of Some Rational Chaotic Maps

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science & Complexity 2020年第3期33卷 584-603页

作者： OUANNAS adel KHENNAOUI Amina-Aicha BENDOUKHA Samir WANG Zhen PHAM Viet-Thanh Laboratory of Mathematics Informatics and Systems(LAMIS)University of Larbi TebessiTebessa 12002Algeria Department of Mathematics and Computer Sciences University of Larbi Ben M'hidiOum El BouaghiAlgeria Department of Electrical Engineering College of EngineeringYanbuTaibah UniversitySaudi Arabia Shaanxi Engineering Research Center of Controllable Neutron Source School of ScienceXijing UniversityXi'an 710123China Faculty of Electrical and Electronic Engineering Phenikaa Institute for Advanced Study(PIAS)Phenikaa UniversityYen NghiaHa Dong districtHanoi 100000Vietnam Phenikaa Research and Technology Institute(PRATI) A&A Green Phoenix Group167 Hoang NganHanoi 100000Vietnam

This paper proposes three fractional discrete chaotic systems based on the Rulkov,Chang,and Zeraoulia–Sprott rational *** dynamics of the proposed maps are investigated by means of phase plots and bifurcations *** stabilization schemes are proposed for each of the three maps and the convergence of the states is established by using the Lyapunov ***,a combination synchronization scheme is proposed whereby a combination of the fractional Rulkov and Chang maps is synchronized to the fractional Zeraoulia-Sprott *** results are used to confirm the findings of the paper.

关键词： Fractional discrete chaos fractional rational maps stabilization synchronization

Thermal buckling behavior of laminated composite plates： a finite-element study

在线全文

学校读者我要写书评

暂无评论

Frontiers of Mechanical Engineering 2014年第1期9卷 41-49页

作者： Houdayfa OUNIS Abdelouahab TATI adel BENCHABANE Laboratoire de Grnie Energrtique et Matrriaux (LGEM) Universit6 deBiskra B.P. 145 Biskra 07000 Algeria

In this paper, the thermal buckling behavior of composite laminated plates under a uniform temperature distribution is studied. A finite element of four nodes and 32 degrees of freedom （DOF）, the bending and mechanical previously developed for buckling of laminated composite plates, is extended to investigate the thermal buckling behavior of laminated composite plates. Based upon the classical plate theory, the present finite element is a combination of a linear isoparametric membrane element and a high precision rectangular Hermitian element. The numerical implementation of the present finite element allowed the comparison of the numerical obtained results with results obtained from the literature： 1） with element of the same order, 2） the first order shear defo^ation theory, 3） the high order shear deformation theory and 4） the three- dimensional solution. It was found that the obtained results were very close to the reference results and the proposed element offers a good convergence speed. Furthermore, a parametrical study was also conducted to investigate the effect of the anisotropy of composite materials on the critical buckling temperature of laminated plates. The study showed that： 1） the critical buckling temperature generally decreases with the increasing of the modulus ratio EL/ET and thermal expansion ratio aT/aL, and 2） the boundary conditions and the orientation angles signifi- cantly affect the critical buckling temperature of laminated plates.

关键词： thermal buckling laminated composite plates,anisotropy critical buckling temperature finite-elementmethod high precision rectangular Hermitian element

Numerical Approach to Simulate the Effect of Corrosion Damage on the Natural Frequency of Reinforced Concrete Structures

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Structural Durability & Health Monitoring 2023年第3期17卷 175-194页

作者： Amthal Hakim Wael Slika Rawan Machmouchi adel Elkordi Department of Civil and Environmental Engineering Beirut Arab UniversityBeirut11520Lebanon Faculty of Engineering Beirut Arab UniversityBeirut11520Lebanon

Corrosion of reinforcing steel in concrete elements causes minor to major damage in different *** may lead to spalling of concrete cover,reduction of section’s capacity and can alter the dynamic *** the dynamic properties,natural frequency is to be a reliable indicator of structural integrity that can be utilized in non-destructive corrosion *** the correlation between natural frequency and corrosion damage has been reflected in different experimental programs,few attempts have been made to investigate this relationship in forward modeling and/or structural health monitoring *** can be attributed to the limited available data,the complex nature of corrosion,and the involvement of multidisciplinaryﬁ***,this study presents a numerical attempt to simulate the effect of corrosion damage on the natural frequency of the *** approach relies on simulating the time history response of the structure using a modiﬁed Bouc-Wen model that incorporates the nonlinear effects of ***,modal analysis is utilized to assess the change in dynamic properties in the frequency ***ﬁnish up,regression algorithms are employed toﬁnd optimal relationship between involved parameters,including corrosion damage as input,and natural frequency as *** efﬁciency of the suggested framework is illustrated in thirteen buildings with cantilevered column lateral force-resisting system and different levels of corrosion.

关键词： Corrosion concrete damage dynamic properties natural frequency nonlinear analysis modal analysis machine learning