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ADVANCED SYNTHESIS Of LIGHT mETALS

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Acta metallurgica Sinica(English Letters) 1996年第6期9卷 531-536页

作者： f.H. froes(ImAP, University of Idaho, moscow, ID 838443026, USA ) Univ of Idaho Moscow United States

The synthesis, processing and mechanical properties of the light metals, aluminum,magnesium and titanium Produced by advanced techniques are reviewed. Synthesis techniques to be addressed will include rapid solidifica... 详细信息

关键词： synthesis/processing powder metallurgy lightweight metals,aluminum magnesium,titanium rapid solidification spray depositin mechanical alloying Plasma processing,vapor deposition

Nanocrystal technology for drug formulation and delivery

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frontiers of Chemical Science and Engineering 2015年第1期9卷 1-14页

作者： Tzu-Lan CHANG Honglei ZHAN Danni LIANG Jun f. LIANG Department of Chemistry Chemical Biology and Biomedical Engineering Charles V. Schaefer School of Engineering and Sciences Stevens Institute of Technology Hoboken NJ 07030 USA Stony Brook University School of medicine Stony Brook NY 11794 USA

With the development of modem technology like high throughput screening, combinatorial chemistry and computer aid drug design, the drug discovery process has been dramatically accelerated. However, new drug candidates often exhibit poor aqueous or even organic medium solubility. Additionally, many of them may have low dissolution velocity and low oral bioavailability. Nanocrystal formulation sheds new light on advanced drug development. Due to small （nano- or micro- meters） sizes, the increased surface-volume ratio leads to drama- tically enhanced drug dissolution velocity and saturation solubility. The simplicity in preparation and the potential for various administration routes allow drug nanocrystals to be a novel drug delivery system for specific diseases （i.e. cancer）. In addition to the comprehensive review of different technologies and methods in drug nanocrystal preparation, suspension, and stabilization, we will also compare nano- and micro-sized drug crystals in pharma- ceutical applications and discuss current nanocrystal drugs on the market and their limitations.

关键词： drug nanocrystal nanotechnology formula-tion bioavailability stabilizers drug delivery

Wettability alteration analysis of smart water/novel functionalized nanocomposites for enhanced oil recovery

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Petroleum Science 2020年第5期17卷 1318-1328页

作者： Sara Habibi Arezou Jafari Zahra f.akhroueian Chemical Engineering faculty Tarbiat Modares UniversityTehranIran School of Chemical Engineering College of EngineeringInstitute of Petroleum EngineeringUniversity of TehranTehranIran

Smart water flooding,as a popular method to change the wettability of carbonate rocks,is one of the interesting and challenging issues in reservoir *** addition,the recent studies show that nanoparticles have a great potential for application in EOR ***,little research has been conducted on the use of smart water with nanoparticles in enhanced oil *** this study,stability,contact angle and IfT measurements and multi-step core flooding tests were designed to investigate the effect of the ionic composition of smart water containing SO4^2- and Ca^2+ ions in the presence of nanofluid on EOR *** amine/organosiloxane@Al2O3/SiO2(AOAS) nanocomposite previously synthesized using co-precipitation-hydrothermal method has been used ***,for the first time the application of this nanocomposite along with smart water has been studied in this *** show that by increasing the concentrations of calcium and sulfate ions in smart water,oil recovery is improved by 9% and 10%,respectively,compared to *** addition,the use of smart water and nanofluids simultaneously is very effective on increasing oil ***,the best performance was observed in smart water containing two times of sulfate ions concentration(SW2 S) with nanofluids,showing increased efficiency of about 7.5%.

关键词： Smart water Nanofluid Wettability alteration Contact angle Stability Enhanced oil recovery

Structural evolution of Al–8%Si hypoeutectic alloy by ultrasonic processing

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Journal of materials Science & Technology 2017年第11期33卷 1235-1239页

作者： J.Y.Wang B.J.Wang L.f.Huang Department of Applied Physics Northwestern Polytechnical University Xi'an 710072 China

High intensity power ultrasound was respectively introduced into three different solidification stages of Al–8%Si hypoeutectic alloy, including the fully liquid state before nucleation, the nucleation and growth process of primary α（Al） phase and L →（Al）＋（Si） eutectic transformation period. It is found that both the primary α（Al） phase and（Al ＋ Si） eutectic structure were refined by different degrees with various growth morphologies depending on the ultrasonic treatment stage. Based on the experimental results,the cavitation-induced nucleation due to the high undercooling caused by the collapse of tiny cavities was proposed as the major reason for refining the primary α（Al） phase. meanwhile, obvious eutectic morphological change was observed only when ultrasound was directly introduced in the eutectic transformation stage, in which typical divorced eutectics and（Al ＋ Si） eutectic cells with symmetrical flower shape were formed at the top of the alloy sample. The introduction of ultrasound in each solidification stage also improves the yield strength of Al–8% Si alloy to a diverse extent.

关键词： Solidification microstructure metals and alloys Power ultrasound Refinement

machine Learning Applied to Problem-Solving in medical Applications

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Computers, materials & Continua 2021年第11期69卷 2277-2294页

作者： mahmoud Ragab Ali Algarni Adel A.Bahaddad Romany f.mansour Department of Information Technology Faculty of Computing and Information TechnologyKing Abdulaziz UniversityJeddah21589Saudi Arabia Centre for Artificial Intelligence in Precision medicine King Abdulaziz UniversityJeddah21589Saudi Arabia Department of Statistics Faculty of ScienceKing Abdulaziz UniversityJeddah21589Saudi Arabia Department of Information Systems Faculty of Computing and Information TechnologyKing Abdulaziz UniversityJeddah21589Saudi Arabia Department of mathematics Faculty of ScienceNew Valley UniversityEl-Kharga72511Egypt

Physical health plays an important role in overall well-being of the human *** is the most observed dimension of health among others such as social,intellectual,emotional,spiritual and environmental *** to exponential increase in the development of wireless communication techniques,Internet of Things(IoT)has effectively penetrated different aspects of human *** is one of the dynamic domains with ever-growing demands which can be met by IoT *** can be leveraged through several health service offerings such as remote health and monitoring services,aided living,personalized treatment,and so *** this scenario,Deep Learning(DL)models are employed in proficient disease *** current research work presents a new IoT-based physical health monitoring and management method using optimal Stacked Sparse Denoising Autoencoder(SSDA)technique i.e.,*** proposed model utilizes a set of IoT devices to collect the data from *** class problem poses serious challenges during disease diagnosis ***,the OSSDA model includes Synthetic minority Over-Sampling Technique(SmOTE)to generate artificial minority class instances to balance the class ***,the hyperparameter settings of the OSSDA model exhibit heavy influence upon the classification performance of SSDA *** number of hidden layers,sparsity,and noise count are determined by Sailfish Optimizer(SfO).In order to validate the effectiveness and performance of the proposed OSSDA technique,a set of experiments was conducted on diabetes and heart disease *** simulation results portrayed a proficient diagnostic outcome from OSSDA technique over other *** proposed method achieved the highest accuracy values i.e.,0.9604 and 0.9548 on the applied heart disease and diabetes datasets respectively.

关键词： IoT patient monitoring physical health deep learning parameter tuning

Thickness-dependent mechanical properties of nacre in Cristaria plicata shell:Critical role of interfaces

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Journal of materials Science & Technology 2020年第9期44卷 1-8页

作者： S.m.Liang H.m.Ji X.W.Li Department of materials Physics and Chemistry School of Materials Science and EngineeringKey Laboratory for Anisotropy and Texture of MaterialsMinistry of EducationNortheastern UniversityShenyang110819China

The thickness dependence of mechanical properties of nacre in Cristaria plicata shell was studied under three-point bending *** results show that the mechanical behavior of nacre exhibits a strong thickness *** bending strength firstly increases with the increase of specimen thickness and then becomes roughly constant as the thickness reaches a certain value of∼***,the mean value of work per unit volume increases constantly with increasing specimen thickness;meanwhile,the cracking mode changes from penetration into the platelets to deflection along the *** theoretical analyses indicate that the thickness-dependent mechanical properties of nacre are mainly caused by the variation in the number of inter-lamellar *** more the number of inter-lamellar interfaces is,the higher the strength and work of fracture of nacre under bending tests will ***,as the number of inter-lamellar interfaces reaches a certain value(e.g.,in the present specimen with 2.5mm thickness),the strength tends to remain constant,while the work of fracture still ***,the present research findings are expected to provide a valuable guidance for the interfacial design of nacre-like materials with high strength and toughness.

关键词： Cristaria plicata shell Nacre mechanical property Thickness Interface

Issues in the mining of Heart failure Datasets

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International Journal of Automation and computing 2014年第2期11卷 162-179页

作者： Nongnuch Poolsawad Lisa moore Chandrasekhar Kambhampati John G.f.Cleland Intelligent Systems Research Group(IS Department of Computer Science) University of Hull Hull York medical School Department of CardiologyUniversity of Hull

This paper investigates the characteristics of a clinical dataset using a combination of feature selection and classification methods to handle missing values and understand the underlying statistical characteristics of a typical clinical dataset. Typically, when a large clinical dataset is presented, it consists of challenges such as missing values, high dimensionality, and unbalanced classes. These pose an inherent problem when implementing feature selection and classification algorithms. With most clinical datasets, an initial exploration of the dataset is carried out, and those attributes with more than a certain percentage of missing values are eliminated from the dataset. Later, with the help of missing value imputation, feature selection and classification algorithms, prognostic and diagnostic models are developed. This paper has two main conclusions: 1) Despite the nature of clinical datasets, and their large size, methods for missing value imputation do not affect the final performance. What is crucial is that the dataset is an accurate representation of the clinical problem and those methods of imputing missing values are not critical for developing classifiers and prognostic/diagnostic models. 2) Supervised learning has proven to be more suitable for mining clinical data than unsupervised methods. It is also shown that non-parametric classifiers such as decision trees give better results when compared to parametric classifiers such as radial basis function networks(RBfNs).

关键词： Heart failure clinical dataset classification clustering missing values feature selection.

Improved slope safety analysis by new Druker-Prager type criterion

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Journal of Central South University 2012年第4期19卷 1132-1137页

作者：朱俊高彭凯 J.f.Shao 刘汉龙 Key Laboratory of Geo-mechanics and Embankment Engineering of ministry of Education Hohai University Geotechnical Research Institute Hohai University Laboratoire de mécanique de Lille UMR CNRS 8107Equipe Mécanique des Géomatériaux CohérentsPolytech'LilleCité Scientifique59655 Villeneuve d'AscqFrance

Based on mohr-Coulomb （m-C） criterion, the parameters of Druker-Prager （D-P） criterion for geomaterial were determined under non-associated flow rule, and thus a new D-P type criterion was presented. Two assumptions were employed during the derivation： 1） principal strains by m-C model and D-P model are equal, and 2） the material is under plane strain condition. Based on the analysis of the surface on rt plane, it is found that the proposed D-P type criterion is better than the D-P criterion with m-C circumscribed circle or m-C inscribed circle, and is applicable for stress Lode angle less than zero. By comparing the predicted results with the test data of sand under plane strain condition and other D-P criteria, the proposed criterion is verified and agrees well with the test data, which is further proved to be better than other D--P type criteria in certain range of Lode angle. The criterion was compiled into a finite difference package fLAC3D by user-subroutine, and was used to analyze the stability of a slope by strength reduction method. The predicted slope safety factor from the proposed criterion agrees well with that by Spencer method, and it is more accurate than that from classic D-P criteria.

关键词： yield criterion non-associated flow rule dilatancy angle plastic potential function

Defect production and atomic mixing by displacement cascades in Ni_3Al

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Science China(Technological Sciences) 1997年第5期40卷 553-560页

作者：高飞王天民 A.f.Calder D.J.Bacon Department of materials Science Lanzhou University Lanzhou 730000 ChinaDepartment of Materials Science Lanzhou University Lanzhou 730000 ChinaDepartment of Materials Science and EngineeringUniversity of LiverpoolLiverpool L69 3BXUKDepartment of Materials Science and EngineeringUniversity of LiverpoolLiverpool L69 3BXUK

molecular dynamics simulations have been employed to investigate displacement cascades in Ni3Al, with energy Ep in the range from 0.15 to 10 keV. The efficiency of production of frenkel pairs declines with the increasing cascade energy in a fashion similar to that found recently for pure metals. The antisite defects are much more numerous than the frenkel pairs, and their production efficiency increases with the increasing cascade energy. A new empirical relationship between the defect number and damage energy is proposed, namely Ndefect = AEpm. A high proportion of the atomic mixing occurs in the ballistic phase and is larger for the Ni atoms, implying that the phenomenon is not purely a liquid-like process.

关键词： Ni3Al displacement cascades defect production atomic mixing molecular dynamics.