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Investigation of mechanical and thermophysical properties of composite materials based on “black binders” with the aim of optimizing the process of their cementing

August 1992
Journal of Engineering Physics and Thermophysics 63(2):766-768

Authors:

Optimum conditions for cementing prepared roofing paper are determined and an installation for laying prepared roofing paper as a hydroinsulating roofing carpet is designed.

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January 1970

This bridge plug has been designed so that it can be lowered through the tubing string of a completed well and set in the casing at some point below the tubing. The entire operation can be performed with wire-line equipment, and is particularly useful for several well completion or workover operations such as cementing, gravel packing, fracturing, and selective injection. The design is also ... [Show full abstract] concentrated on providing a good anchoring relationship with the casing, which has been a major deficiency of similar bridge plugs. Packer setting is done by actuation of an explosive charge. (10 claims)

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Recording studio rehabilitation.

November 2008 · The Journal of the Acoustical Society of America

Marshall Long

From time to time projects are designed and built, which do not perform in the expected manner. Sometimes outside events interfere with the design intent. In other cases there is a fundamental misunderstanding of the technical principles involved. This is an example of one of these cases. A recording studio was designed (by a well known studio designer, who shall remain nameless) and built on the ... [Show full abstract] first floor of a multistory high rise in Los Angeles, CA. It consisted of a studio approximately 20x18x10 ft(3) high and an adjacent control room. A 3-in. concrete floor was isolated on 12-in. rubber and the walls and ceiling were built independently on top of the floor. After completion both footfall and carts being pushed along a corridor approximately 15 ft away were clearly audible inside the studio. This paper describes the steps taken to analyze and correct the problem.

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October 1994

This report is a guide for trainers in Army National Guard (ARNG) armor units for a device-based gunnery training strategy. The purpose of the strategy is to reduce or compress the time required to prepare for tank crew gunnery qualifications (i.e., Table VIII). The strategy compresses the required training time by (a) limiting training to those skills and knowledges needed for successful Table ... [Show full abstract] VIII performance, (b) focusing training on Table VIII engagements that are most difficult to ARNG crews to perform, and (c) allocating device training time to crews that need it most and away from crews that are demonstrably proficient on the training device. The strategy is designed to be implemented at the local level with either the Conduct-of-Fire Trainer (COFT) or the Guard Unit Armory Device Full-Crew Interactive Simulation Trainer, Armor (GUARDFIST I). Reserve component, Table VIII, Tank gunnery, Army National Guard, Armor training, Training strategy

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Sierpinski carpet is one of the very beautiful fractals from the historic gallery of classical fractals. Carpet designing is not only a fascinating activity in computer graphics, but it has real applications in carpet industry as well. One may find illusionary delighted carpets designed here, which are useful in real designing of carpets. In this paper, we attempt to systematize their generation ... [Show full abstract] and put them into categories. Each next category leads to a more generalized form of the fractal carpet.

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January 1977

This paper describes some of the advances made in the last few years in the development of pipe production systems in the author's company, and postulates that designers can significantly affect the efficiency of pipe production and installation. A computer system for preparing pipe production information is described and, in conclusion, some of the advanced techniques developed to meet the ... [Show full abstract] demands of modern ship systems are discussed. (A)

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October 2000

This security improvement module, Detecting Signs of Intrusion, describes practices involved in preparing to detect and detecting intrusions into networked computer systems. The practices are designed to help network and system administrators prepare for and detect intrusions by looking for unexpected or suspicious behavior and then recognizing "fingerprints" of known intrusion methods.

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Topology Design Optimization using Projection Method

August 2016 · Journal of the Computational Structural Engineering Institute of Korea

Seung-Hyun Ha

In this paper, a projection method is introduced which is used in topology design optimization. In the projection method, each active design variable is projected onto the design domain depending on the shape and size of the projection functions, and the finite element under this projection receives a solid material. Furthermore, the size of the projection function defines the minimum length ... [Show full abstract] scale of the structural members. Therefore, a designer can easily apply design constraints without complicated post-processing procedure. In addition, the projection method can be combined with the homogenization theory, and applied to material design problem for composite materials. Topology design optimization for the unit-cell of the periodic structures can maximize the effective material properties, which yields the optimal material distribution with maximum bulk or shear moduli under a given volume fraction.

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March 1989 · International Journal For Numerical Methods in Engineering

The introduction of composite materials is having a profound effect on the design process. Because these materials permit the designer to tailor material properties to improve structural, aerodynamic and acoustic performance, they require a more integrated multidisciplinary design process. Because of the complexity of the design process numerical optimization methods are required. The present ... [Show full abstract] paper is focused on a major difficulty associated with the multidisciplinary design optimization process—its enormous computational cost. We consider two approaches for reducing this computational burden: (i)development of efficient methods for cross-sensitivity calculation using perturbation methods; and (ii) the use of approximate numerical optimization procedures. Our efforts are concentrated upon combined aerodynamic-structural optimization. Results are presented for the integrated design of a sailplane wing. The impact of our computational procedures on the computational costs of integrated designs is discussed.

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September 2011 · Applied Mechanics and Materials

In this paper both a hollow floor and the corresponding solid floor are analysed by using finite element software and the results are compared. The comparison is made through a detailed finite element study between a column-supported cast-in-situ hollow floor filled by tube with its solid counter-part. The orientation of the tube fillers causes the stiffness of the hollow slab to be orthotropic, ... [Show full abstract] potentially changing the distribution of load carrying between the two orthogonal directions. The inclusion of the hollows also potentially increases the flexibility of the slab. Recommendations for design of column-supported cast-in-situ concrete floors compared with the solid floor are then made with respect to distribution of design moments and calculation of deflections. Thus the reference was given to the designer.

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A practical method for conducting the first stages of the design of a serious game is presented. The idea is to have two designers, and instructional designer and a game designer, prepare short overall designs using a two page document called a sketch. They then merge the two using a process that combines a storyboard and a walkthrough. The final result is a single short design document that can ... [Show full abstract] be used in successive stages.

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January 2005

Kendall Hartley

This chapter will describe the realities of K-12 classroom practice and how this compares to common tenets in the field of instructional design. Specifically, the chapter will describe how trends towards the use of information and communication technologies in classrooms might be made more advantageous through the use of an instructional design approach. The chapter will include an introduction ... [Show full abstract] to the field and history of instructional design, an overview of current teacher preparation as it relates to designing instruction, and how a systematic instructional design perspective might differ. The chapter will conclude with a description of how changes in teacher preparation and access to the appropriate tools could facilitate increases in student achievement.

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Structural Design and Analysis of a New Soil Moisture Probe

August 2013 · Applied Mechanics and Materials

It presents a new structure of soil moisture probe which is designed for the solar automatic water-saving irrigation. DC two-probe method is used to measure resistivity of the new probe with different content of graphite under wet and dry conditions. The results show the resistance variation of the composite material with more than 25% graphite content is very small, its suitable for the ... [Show full abstract] production of two-pin probe; the conduction of composite material with less than 15% graphite content are greatly affected by the cement, its suited for the production of one-pin probe. The research results can be used as reference for choosing moisture probe according to different soil.

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Investigation of mechanical and thermophysical properties of composite materials based on “black binders” with the aim of optimizing the process of their cementing

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