A Research Note on Complex Forming Properties of the New Composite Materials Based on Dialdehide Cellulose and Acrylate Derivatives of Guanidine with D-Elements

2014 ◽  
pp. 173-180
Keyword(s):  
Composite Materials ◽  
Research Note ◽  
Derivatives Of

Composite Laminate Stiffnesses and Their Sensitivities

1994 ◽  
Author(s):  
Bodo Geier ◽  
Rolf Zimmermann
Keyword(s):  
Composite Materials ◽  
Transverse Shear ◽  
Composite Laminate ◽  
Shear Stiffness ◽  
Efficient Algorithms ◽  
Search Procedure ◽  
Object Function ◽  
Stiffness Matrices ◽  
Derivatives Of ◽  
Constrained Function

Abstract The great number of possible stacking orders to form laminates suggests to apply optimization, more frequently than usual, in the design of structures made of composite materials. One of the columns upon which optimization of structures is built is the mathematical search procedure for locating a minimum (or maximum) of a constrained function. Efficient algorithms will require the evaluation of derivatives of the object function as well as of the constraints. In that context the sensitivities of laminate stiffness matrices may be required. In order to meet such a requirement the derivatives with respect to both ply thicknesses and ply angles, of laminate stiffnesses, including transverse shear stiffness, will be presented in this report.

scholarly journals COMPARATIVE STUDY OF COMPOSITE MATERIALS BASED ON DIGLYCYLIC DERIVATIVES OF DIPHENYLMETHANE AND DIPHENYLPROPANE

2018 ◽  
Vol 3 (11) ◽  
pp. 91-98 ◽  
Author(s):  
Юрий Кочергин ◽  
Yuriy Kochergin ◽  
Виктория Золотарева ◽  
Viktoriya Zolotareva
Keyword(s):  
Composite Materials ◽  
Comparative Study ◽  
Derivatives Of

scholarly journals Polymeric Composite Materials for the Detection of Barium Ions in Aqueous Solutions

2019 ◽  
Vol 2019 ◽  
pp. 1-5
Author(s):  
Sergei Yu. Zaitsev ◽  
Marina S. Tsarkova ◽  
Ilia S. Zaitsev
Keyword(s):  
Composite Materials ◽  
Aqueous Solutions ◽  
Polymeric Composite ◽  
Polyvinyl Butyral ◽  
Barium Ions ◽  
Polymeric Composite Materials ◽  
Film Forming ◽  
Optical Determination ◽  
Derivatives Of

The design of polymeric composite materials (PCM) for the optical control of chemical substances is currently one of the actively developing fields of science “at the junction” of polymer, organic, and analytical chemistry. The purpose of this work is the preparation of PCM containing derivatives of crown ethers for the optical determination of barium ions. The polymeric composite materials containing a novel optical molecular sensor have been obtained and investigated on the basis of a number of film-forming polymers. The best results have been obtained for PCM based on polyvinyl butyral films (since the fluorescence and absorption maxima shifted by 9 and 16 nm, respectively) in the fluorescence and absorption spectra of this PCM in the presence of barium ions. This makes the proposed PCM highly promising as sensor elements for the detection of the barium ions in the aqueous solutions.

Propagation of Stress Gradient Through an Inclusion—Part 1

1973 ◽  
Vol 40 (3) ◽  
pp. 711-717 ◽  
Author(s):  
T. C. T. Ting ◽  
Shun-Chin Chou
Keyword(s):  
Composite Materials ◽  
Wave Front ◽  
Incident Wave ◽  
Stress Gradient ◽  
Higher Order ◽  
Elastic Media ◽  
Interface Boundary ◽  
Reflection And Transmission ◽  
Transmission Coefficients ◽  
Derivatives Of

This is the first of a two-part study on the propagation of stress gradient in composite materials. Both the plane-strain and axisymmetric motions are considered. In this paper, the reflection and transmission coefficients are derived for the stress, the stress gradient, and the higher-order derivatives of stress at an interface between two elastic media. It is shown that while the reflection and transmission of the stress do not depend on the geometries of the incident wave front and the interface boundary, the reflection and transmission of the stress gradient, and the higher-order derivatives of stress do depend on these geometries. Explicit expressions are derived for the reflection and transmission of the stress gradient in terms of the radii of curvatures of the incident wave front and the interface boundary.

Comparative Microstructures of Ion Milled and Electrochemically Thinned Composite Materials

1974 ◽  
Vol 32 ◽  
pp. 546-547
Author(s):  
R.R. Russell
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Composite Materials ◽  
Great Difficulty ◽  
Ion Milling ◽  
Transmission Electron ◽  
Ion Damage ◽  
Intermetallic Composite

Transmission electron microscopy of metallic/intermetallic composite materials is most challenging since the microscopist typically has great difficulty preparing specimens with uniform electron thin areas in adjacent phases. The application of ion milling for thinning foils from such materials has been quite effective. Although composite specimens prepared by ion milling have yielded much microstructural information, this technique has some inherent drawbacks such as the possible generation of ion damage near sample surfaces.

Transmission electron microscopy of composite materials

1988 ◽  
Vol 46 ◽  
pp. 1012-1015
Author(s):  
K.P.D. Lagerlof
Keyword(s):  
Composite Materials ◽  
Physical Properties ◽  
Structural Defects ◽  
Structural Composites ◽  
Multiphase Materials ◽  
Structural Reinforcement ◽  
Transmission Electron ◽  
Reinforced Fiber ◽  
Particulate Reinforced Composites ◽  
Definition Of

Although most materials contain more than one phase, and thus are multiphase materials, the definition of composite materials is commonly used to describe those materials containing more than one phase deliberately added to obtain certain desired physical properties. Composite materials are often classified according to their application, i.e. structural composites and electronic composites, but may also be classified according to the type of compounds making up the composite, i.e. metal/ceramic, ceramic/ceramie and metal/semiconductor composites. For structural composites it is also common to refer to the type of structural reinforcement; whisker-reinforced, fiber-reinforced, or particulate reinforced composites [1-4].For all types of composite materials, it is of fundamental importance to understand the relationship between the microstructure and the observed physical properties, and it is therefore vital to properly characterize the microstructure. The interfaces separating the different phases comprising the composite are of particular interest to understand. In structural composites the interface is often the weakest part, where fracture will nucleate, and in electronic composites structural defects at or near the interface will affect the critical electronic properties.

Experiences With and Lessons Learned From Developing, Implementing, and Evaluating a Support Program for Older Hearing Aid Users and Their Communication Partners in the Hearing Aid Dispensing Setting

2020 ◽  
Vol 29 (3S) ◽  
pp. 638-647 ◽  
Author(s):  
Janine F. J. Meijerink ◽  
Marieke Pronk ◽  
Sophia E. Kramer
Keyword(s):  
Large Scale ◽  
Hearing Aid ◽  
Critical Discussion ◽  
Lessons Learned ◽  
Research Note ◽  
Support Program ◽  
Large Sample Size ◽  
Long Term Effects ◽  
Communication Program ◽  
Communication Partners

Purpose The SUpport PRogram (SUPR) study was carried out in the context of a private academic partnership and is the first study to evaluate the long-term effects of a communication program (SUPR) for older hearing aid users and their communication partners on a large scale in a hearing aid dispensing setting. The purpose of this research note is to reflect on the lessons that we learned during the different development, implementation, and evaluation phases of the SUPR project. Procedure This research note describes the procedures that were followed during the different phases of the SUPR project and provides a critical discussion to describe the strengths and weaknesses of the approach taken. Conclusion This research note might provide researchers and intervention developers with useful insights as to how aural rehabilitation interventions, such as the SUPR, can be developed by incorporating the needs of the different stakeholders, evaluated by using a robust research design (including a large sample size and a longer term follow-up assessment), and implemented widely by collaborating with a private partner (hearing aid dispensing practice chain).

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