In the Custom House

2020 ◽  
pp. 37-50
Author(s):  
Isabel Hofmeyr

In port cities, Customs and Excise fulfilled a number of literary functions. Their officials checked books to see that they were not pirated, seditious, or obscene, and they hence involved themselves in the protocols of copyright and censorship. This article examines the forms of reading associated with these activities and it argues that these modes of readings were shaped by the dockside procedures and routines that governed the work of Customs examiners. Customs officials functioned like dockside ontologists, assigning objects to categories for purposes of tariff duties. In doing so, they paid extensive attention to the nature, weight, composition, and marking of these objects, apprenticing themselves to the material properties of the commodities that passed through their jurisdiction. Their methods of reading were governed by object rather than text and were hence object-oriented.

Author(s):  
Michael M. Tiller ◽  
Jonathan A. Dantzig

Abstract In this paper we discuss the design of an object-oriented framework for simulation and optimization. Although oriented around high-level problem solving, the framework defines several classes of problems and includes concrete implementations of common algorithms for solving these problems. Simulations are run by combining these algorithms, as needed, for a particular problem. Included in this framework is the capability to compute the sensitivity of simulation results to the different simulation parameters (e.g. material properties, boundary conditions, etc). This sensitivity information is valuable in performing optimization because it allows the use of gradient-based optimization algorithms. Also included in the system are many useful abstractions and implementations related to the finite element method.


Author(s):  
H. Takahashi ◽  
S. Nagasawa ◽  
H. Sakuta

Abstract The paper deals with a method of high speed construction of stiffness matrix in FEM. The stiffness matrices of each element becomes to equal in following conditions. 1) Components of the B and D matrices are independent of global coordinate. 2) Elements have the same material properties and the same local coordinates respectively. This equality gives possibility of associable calculation to us. Hence, we can generate the global stiffness matrix at high speed by use of this feature. In this paper, a method of associable calculation by using equality of object ELEMENT based on object oriented concept is proposed. Futhermore, in comparison between conventional method and proposed one, relationship between accelerative rate and ratio of equal object and result of numerical experiment are described.


Author(s):  
C.L. Briant

Grain boundary segregation is the process by which solute elements in a material diffuse to the grain boundaries, become trapped there, and increase their local concentration at the boundary over that in the bulk. As a result of this process this local concentration of the segregant at the grain boundary can be many orders of magnitude greater than the bulk concentration of the segregant. The importance of this problem lies in the fact that grain boundary segregation can affect many material properties such as fracture, corrosion, and grain growth.One of the best ways to study grain boundary segregation is with Auger electron spectroscopy. This spectroscopy is an extremely surface sensitive technique. When it is used to study grain boundary segregation the sample must first be fractured intergranularly in the high vacuum spectrometer. This fracture surface is then the one that is analyzed. The development of scanning Auger spectrometers have allowed researchers to first image the fracture surface that is created and then to perform analyses on individual grain boundaries.


Author(s):  
Brian Ralph ◽  
Barlow Claire ◽  
Nicola Ecob

This brief review seeks to summarize some of the main property changes which may be induced by altering the grain structure of materials. Where appropriate an interpretation is given of these changes in terms of current theories of grain boundary structure, and some examples from current studies are presented at the end of this paper.


2000 ◽  
Vol 147 (3) ◽  
pp. 61 ◽  
Author(s):  
V. Cortellessa ◽  
G. Iazeolla ◽  
R. Mirandola

IEE Review ◽  
1990 ◽  
Vol 36 (9) ◽  
pp. 338
Author(s):  
Stephen Wilson

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