检索结果-南通市图书馆

Active packaging of chitosan film modified with basil oil encapsulated in silica nanoparticles as an alternate for plastic packaging materials

引用

Food Bioscience 2023年第1期51卷 773-784页

作者： Maha Sultan a.a.abdelhakim Mona Nassar Youssef R.Hassan Packaging Materials Department National Research Centre33 El Bohouth St.(former El Tahrirst.)DokkiGizaP.O.12622Egypt

Active packaging based on biomaterials and essential oils is an alternate for plastic ***,essential oils are chemically and physiologically labile,and they have strong scents,limiting their use as antimicrobial additives in ***,in this investigation,basil oil was encapsulated in silica nanoparticles(basil oil@SiNPs)and combined with chitosan films(basil oil@SiNPs@chitosan).Scanning electron microscopy(SEM),Transmission electron microscopy(TEM),X-ray diffraction(XRD),surface area and Brunauer-Emmett-Teller(BET)analysis,encapsulation and loading%were used to evaluate basil oil@*** surface area of SiNPs decreased from 59.006 to 43.86 cm^(2)/g due to basil oil *** encapsulation and loading%were 81.96,65.87,48.48 and 43.13,37.64,33.44%for 2,1.5,and 1 mL of basil oil,***-transform infrared(FT-IR),XRD,thermogravimetric analysis(TG),mechanical,wettability,water vapor permeability(WVP),oxygen permeability(OP)features;water vapor sorption isotherms and antimicrobial inhibition tests were used to describe the produced basil oil@SiNPs@chitosan *** contact angles and activation energy increased from 89.0◦to 110.9◦and-11.97 to-20.40 kJ/mol,respectively after addition of basil oil@***,WVP decreased from 5.9580×10^(-1)±0.33 to 4.2413×10^(-1)±0.55 ***.m^(-2).h^(-1).kPa^(-1)and OP increased from 4.094×10^(-4)±0.52 to 6.715×10^(-5)±0.32(g.m^(-2).day^(-1).atm^(-1)).The four models Guggenheim-Anderson-de Boer(GAB),Smith,Henderson and SIPSI were suitable for describing the moisture sorption of basil oil@SiNPs@chitosan *** oil@SiNPs has antimicrobial inhibition against Gram positive and negative bacteria,pathogenic yeast.

关键词： Active packaging Basil essential oil Silica nanoparticles Antimicrobial activity Chitosan Biofilm

来源：

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

Dynamic Interaction Analysis of Coupled Axial-Torsional-Lateral Mechanical Vibrations in Rotary Drilling Systems

引用

Structural Durability & Health Monitoring 2025年第1期19卷 77-103页

作者： Sabrina Meddah Sid Ahmed Tadjer abdelhakim Idir Kong Fah Tee Mohamed Zinelabidine Doghmane Madjid Kidouche Applied Automation Laboratory Faculty of Hydrocarbons and ChemistryUniversity of BoumerdesBoumerdes35000Algeria Institute of Electrical and Electronic Engineering(IGEE) University of BoumerdesBoumerdes35000Algeria Laboratory of the Electrification of Industrial Enterprises University of BoumerdesBoumerdes35000Algeria Electrical Engineering Department Mohamed Boudiaf University of M’silaM’sila28000Algeria Department of Civil and Environmental Engineering King Fahd University of Petroleum&MineralsDhahran31261Saudi Arabia Interdisciplinary Research Center for Construction and Building Materials King Fahd University of Petroleum&Minerals(KFUPM)Dhahran31261Saudi Arabia

Maintaining the integrity and longevity of structures is essential in many industries,such as aerospace,nuclear,and *** achieve the cost-effectiveness of large-scale systems in petroleum drilling,a strong emphasis on structural durability and monitoring is *** study focuses on the mechanical vibrations that occur in rotary drilling systems,which have a substantial impact on the structural integrity of drilling *** study speciﬁcally investigates axial,torsional,and lateral vibrations,which might lead to negative consequences such as bit-bounce,chaotic whirling,and high-frequency *** events not only hinder the efﬁciency of drilling but also lead to exhaustion and harm to the system’s components since they are difﬁcult to be detected and controlled in real *** study investigates the dynamic interactions of these vibrations,speciﬁcally in their high-frequency modes,usingﬁeld data obtained from measurement while ***ﬁndings have demonstrated the effect of strong coupling between the high-frequency modes of these vibrations on drilling sys-tem *** obtained results highlight the importance of considering the interconnected impacts of these vibrations when designing and implementing robust control ***,integrating these compo-nents can increase the durability of drill bits and drill strings,as well as improve the ability to monitor and detect ***,by exploiting theseﬁndings,the assessment of structural resilience in rotary drilling systems can be ***,the study demonstrates the capacity of structural health monitoring to improve the quality,dependability,and efﬁciency of rotary drilling systems in the petroleum industry.

关键词： Rotary drilling systems mechanical vibrations structural durability dynamic interaction analysis ﬁeld data analysis

来源：

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

Heuristic techniques for maximum likelihood localization of radioactive sources via a sensor network

引用

Nuclear Science and Techniques 2023年第8期34卷 174-193页

作者： Assem abdelhakim Department of Radiation Engineering National Center for Radiation Research and TechnologyEgyptian Atomic Energy AuthorityCairo 11787Egypt

Maximum likelihood estimation(MLE)is an effective method for localizing radioactive sources in a given ***,it requires an exhaustive search for parameter estimation,which is *** this study,heuristic techniques were employed to search for radiation source parameters that provide the maximum likelihood by using a network of ***,the time consumption of MLE would be effectively ***,the radiation source was detected using the k-sigma ***,the MLE was applied for parameter estimation using the readings and positions of the detectors that have detected the radiation source.A comparative study was performed in which the estimation accuracy and time consump-tion of the MLE were evaluated for traditional methods and heuristic *** traditional MLE was performed via a grid search method using fixed and multiple ***,four commonly used heuristic algorithms were applied:the firefly algorithm(FFA),particle swarm optimization(PSO),ant colony optimization(ACO),and artificial bee colony(ABC).The experiment was conducted using real data collected by the Low Scatter Irradiator facility at the Savannah River National Laboratory as part of the Intelligent Radiation Sensing System *** comparative study showed that the estimation time was 3.27 s using fixed resolution MLE and 0.59 s using multi-resolution *** time consumption for the heuristic-based MLE was 0.75,0.03,0.02,and 0.059 s for FFA,PSO,ACO,and ABC,*** location estimation error was approximately 0.4 m using either the grid search-based MLE or the heuristic-based ***,heuristic-based MLE can provide comparable estimation accuracy through a less time-consuming process than traditional MLE.

关键词： Radioactive source Maximum likelihood estimation Multi-resolution MLE k-sigma Firefly algorithm Particle swarm optimization Ant colony optimization Artificial bee colony

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Identification and control of a small-scale helicopter

引用

Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2010年第12期11卷 978-985页

作者： abdelhakim DEBOUCHA Zahari TAHA Centre for Product Design and Manufacturing University of Malaya Faculty of Manufacturing Engineering and Management Technology University Malaysia Pahang

Designing reliable flight control for an autonomous helicopter requires a high performance dynamics *** this paper,a nonlinear autoregressive with exogenous inputs (NLARX) model is selected as the mathematical structure for identifying and controlling the flight of a small-scale helicopter.A neural network learning algorithm is combined with the NLARX model to identify the dynamic component of the rotorcraft unmanned aerial vehicle (RUAV).This identification process is based on the well-known gradient descent learning *** a case study,the multiple-input multiple-output (MIMO) model predictive control (MPC) is applied to control the pitch motion of the *** of the neural network output model are closely match with the real flight *** MPC also shows good performance under various conditions.

关键词： Dynamics model System identification Black box Small-scale helicopter Neural networks (NNs) Control design

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

HARDY'S INEQUALITIES WITH MAXIMIZERS FOR W^(1,p) FUNCTIONS ON BOUNDED STAR DOMAINS

引用

Acta Mathematica Scientia 2019年第1期39卷 26-36页

作者： Ahmed A.abdelhakim Department of Mathematics Faculty of Science Assiut University

With the help of a radially invariant vector field, we derive inequalities of the Hardy kind, with no boundary terms, for W^(1,p) functions on bounded star domains. Our results are not obtainable from the classical inequalities for W_0^(1,p) functions. Unlike in W_0^(1,p),our inequalities admit maximizers that we describe explicitly.

关键词： Hardy type inequalities radially invariant vector field Sobolev maximizers star domains trace operator

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Numerical modeling and parametric sensitivity analysis of heat transfer and two-phase oil and water flow characteristics in horizontal and inclined flowlines using OpenFOAM

引用

Petroleum Science 2023年第2期20卷 1183-1199页

作者： Nsidibe Sunday abdelhakim Settar Khaled Chetehouna Nicolas Gascoin INSA Centre Val de Loire UniversitéOrléansPRISME EA 4229F-18020BourgesFrance

Estimating the oil-water temperatures in flowlines is challenging especially in deepwater and ultra-deepwater offshore applications where issues of flow assurance and dramatic heat transfer are likely to occur due to the temperature difference between the fluids and the surroundings. Heat transfer analysis is very important for the prediction and prevention of deposits in oil and water flowlines, which could impede the flow and give rise to huge financial losses. Therefore, a 3D mathematical model of oil-water Newtonian flow under non-isothermal conditions is established to explore the complex mechanisms of the two-phase oil-water transportation and heat transfer in different flowline inclinations. In this work, a non-isothermal two-phase flow model is first modified and then implemented in the InterFoam solver by introducing the energy equation using OpenFOAM® code. The Low Reynolds Number (LRN) k-ε turbulence model is utilized to resolve the turbulence phenomena within the oil and water mixtures. The flow patterns and the local heat transfer coefficients (HTC) for two-phase oil-water flow at different flowlines inclinations (0°, +4°, +7°) are validated by the experimental literature results and the relative errors are also compared. Global sensitivity analysis is then conducted to determine the effect of the different parameters on the performance of the produced two-phase hydrocarbon systems for effective subsea fluid transportation. Thereafter, HTC and flow patterns for oil-water flows at downward inclinations of 4°, and 7° can be predicted by the models. The velocity distribution, pressure gradient, liquid holdup, and temperature variation at the flowline cross-sections are simulated and analyzed in detail. Consequently, the numerical model can be generally applied to compute the global properties of the fluid and other operating parameters that are beneficial in the management of two-phase oil-water transportation.

关键词： Flow assurance Flow pattern Heat transfer Flowlines Two-phase flow Global sensitivity analysis

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Improved MPPT Control Strategy for PV Connected to Grid Using IncCond-PSO-MPC Approach

引用

CSEE Journal of Power and Energy Systems 2023年第3期9卷 1008-1020页

作者： Nora Kacimi abdelhakim Idir Said Grouni Mohamed Seghir Boucherit Laboratoire de Commande de Processus ENP AlgerAlgiersAlgeria Electrical Engineering Department University of M’silaBP 28000M’silaAlgeria Boumerdes University Boumerdes35000BoumerdesAlgeria.He is now with the Tamaghasset UniversityAlgeria

This paper proposes a new hybrid maximum power point tracking(MPPT)control strategy for grid-connected solar systems based on Incremental conductance—Particle Swarm Optimization and Model Predictive Controller(IncCond-PSOMPC).The purpose of the suggested method is to create as much power as feasible from a PV system during environmental changes,then transfer it to the power *** accomplish this,a hybrid combination of incremental conductance(IncCond)and particle swarm optimization(PSO)is proposed to locate maximum power,followed by model predictive control(MPC)to track maximum power and control the boost converter to achieve high performance regardless of parameter variations.A two-level inverter,likewise,controlled by Model Predictive Control,is employed to inject the PV power *** this application,the MPC is based on minimizing the difference between the reference and prediction powers,which is computed to select the switching state of the *** proposed system is simulated and evaluated in a variety of dynamic conditions using Matlab/*** reveal that the proposed control mechanism is effective at tracking the maximum power point(MPP)with fewer power oscillations.

关键词： DC/DC boost converter grid-connected PV incremental conductance particle swarm optimization and model predictive controller(IncCond-PSO-MPC) maximum power point tracking(MPPT) photovoltaic(PV)

来源：

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

Essential oils of Origanum compactum increase membrane permeability,disturb cell membrane integrity,and suppress quorum-sensing phenotype in bacteria

引用

Journal of Pharmaceutical Analysis 2019年第5期9卷 301-311页

作者： abdelhakim Bouyahya Jamal Abrini Nadia Dakka Youssef Bakri Laboratory of Human Pathologies Biology Department of Biology Faculty of Sciences and Genomic Center of Human Pathologies Faculty of Medicine and Pharmacy Mohammed V University Rabat Morocco Biology and Health Laboratory Department of Biology Faculty of Science Abdelmalek Essaadi University Tetouan Morocco

The aim of this study was to investigate antibacterial activity of Origanum compactum essential oils collected at three phenological stages on Escherichia coli and Bacillus subtilis. The antibacterial activity was evaluated using the agar-well diffusion assay. The MIC and MBC values were determined using the micro-dilution assay. The investigation of the antibacterial action was carried out by the evaluation of the effect of O. compactum essential oils on the antibacterial kinetic growth, the integrity of cell membrane and permeability of the cell membrane. The anti-quorum sensing activity was tested by the inhibition of the biofilm formation. The findings of this study showed that O. compactum essential oil has potent antibacterial activities against E. coli and B. subtilis. The lowest inhibition value against B. subtilis was obtained with O. compactum essential oil at the post-flowering stage (MIC=MBC=0.0312%(v/v)). The antibacterial mechanisms of O. compactum essential oils are related to the disturbing of the cell membrane integrity and the increasing of the membrane permeability, which leads to the leakage of genetic materials (DNA and RNA). Moreover, O. compactum essential oils inhibited the formation of the biofilms, a phenotype that has been known to be quorum sensing regulated.

关键词： Origanum compactum Essential oil Antibacterial action Cell membrane Quorum sensing inhibition

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Super twisting sliding mode approach applied to voltage orientated control of a stand-alone induction generator

引用

Protection and Control of Modern Power Systems 2021年第1期6卷 233-241页

作者： Yacine Bendjeddou abdelhakim Deboucha Larafi Bentouhami Elkheir Merabet Rachid Abdessemed Laboratory of electrical and materials engineering(LGEM) Higher School of Electrical and Energetic Engineering of Oran31000Bir El DjirAlgeria Ecole Supérieure des Sciences Appliquées d’Alger Electrical Engineering Department16000AlgiersAlgeria Department of electromechanical University of Bordj Bou Arréridj34000El AnceurAlgeria Laboratory LEB Department of Electrical EngineeringUniversity of Batna-205000FesdisAlgeria

To enhance the robustness and dynamic performance of a self-excited induction generator (SEIG) used in a stand-alone wind energy system (WES), a virtual flux oriented control (VFOC) based on nonlinear super-twisting sliding mode control (STSMC) is adopted. STSMC is used to replace the conventional proportional-integral-Fuzzy Logic Controller (PI-FLC) of the inner current control loops. The combination of the proposed control strategy with space vector modulation (SVM) applied to a PWM rectifier brings many advantages such as reduction in harmonics, and precise and rapid tracking of the references. The performance of the proposed control technique (STSMC-VFOC-SVM) is verified through simulations and compared with the traditional technique (PI-FLC-VFOC-SVM). It shows that the proposed method improves the dynamics of the system with reduced current harmonics. In addition, the use of a virtual flux estimator instead of a phase-locked loop (PLL) eliminates the line voltage sensors and thus increases the reliability of the system.

关键词： Self-excited induction generator Virtual flux oriented control Back-to-back converter Super twisting sliding mode control PI-fuzzy controller wind energy

来源：

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

Medicinal plant products targeting quorum sensing for combating bacterial infections

引用

Asian Pacific Journal of Tropical Medicine 2017年第8期10卷 795-809页

作者： abdelhakim Bouyahya Nadia Dakka Abdeslam Et-Touys Jamal Abrini Youssef Bakri Laboratory of Human Pathologies Biology Department of BiologyFaculty of Sciencesand Genomic Center of Human PathologiesMohammed V UniversityRabatMorocco Biology and health Laboratory Department of BiologyFaculty of ScienceAbdelmalek Essaadi UniversityTetouanMorocco

Traditional treatment of infectious diseases is based on compounds that aim to kill or inhibit bacterial growth. The bacterial resistance against antibiotics is a serious issue for public health. Today, new therapeutic targets other than the bacterial wall were deciphered. Quorum sensing or bacterial pheromones are molecules called auto-inducer secreted by bacteria to regulate some functions such as antibiotic resistance and biofilms formation. This therapeutic target is well-studied worldwide, nevertheless the scientific data are not updated and only recent researches started to look into its potential as a target to fight against infectious diseases. A major concern with this approach is the frequently observed development of resistance to antimicrobial compounds. Therefore, this paper aims to provide a current overview of the quorum sensing system in bacteria by revealing their implication in biofilms formation and the development of antibiotic resistance, and an update on their importance as a potential target for natural substances.

关键词： Quorum sensing Biofilms Bacterial resistance Natural compounds

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：