Jacob Hendricks , Matthew J. Patitz , and Trent A. Rogers ? ? ? Abstract. In this paper, we investigate the abilities of systems of selfassembling tiles which can each pass a constant number of signals to their immediate neighbors to create replicas of input shapes. Namely, we work within the Signal-passing Tile Assembly Model (STAM), and we provide a universal STAM tile set which is capable of...

introduction: occupational exposure to excessive noise is commonly encountered in a large number of industries in iran. this study evaluated the hearing threshold and hearing loss in meybod tile factory workers. methods: this cross-sectional study included 371 tile factoryworkers during summer and autumn of 2005. current noise exposure was estimated using sound level meter .a specially formatte...

  Background & Aims of the Study: Dust is one of the detrimental factors in workplace of tile industry. Exposure to excessive amount of dust can create various hazards to the workers. Therefore, the present study aimed to measure the concentration of environmental and respirable dust in air of Birjand Niloofar tile Industry. Materials & Methods: In the present study, using personal...

Let b ≥ 2 be an integer base, D = {0, d1, · · · , db−1} ⊂ Z a digit set and T = T (b,D) the set of radix expansions. It is well known that if T has nonvoid interior, then T can tile R with some translation set J (T is called a tile and D a tile digit set). There are two fundamental questions studied in the literature: (i) describe the structure of J ; (ii) for a given b, characterize D so that ...

We describe computer algorithms that can enumerate and display, for a given n > 0 (in theory, of any size), all n-ominoes, niamonds, and n-hexes that can tile the plane using only rotations; these sets necessarily contain all such tiles that are fundamental domains for p4, p3, and p6 isohedral tilings. We display the outputs for small values of n. This expands on earlier work [3]. 1 Polyominoes...

Mosque as the house of God has always been significant to rulers, people and Muslim artists. It is one of the most ancient architectural subjects. Varamin1Jami mosque from Ilkhanid2 era is one of the masterpieces of Iranian-Islamic architecture. It was one of the first projects which started the glorious era of renovation after the dark times of the Mongols3 invasion. Perfect stucco ornaments i...

Buyer cooperatives, buyer alliances, and horizontal mergers are often perceived as attempts to increase buyer power. While prior theoretical and empirical work has emphasized that buyer size can increase buyer surplus, I show that even a small group of buyers with heterogeneous preferences can increase price competition among rival sellers by forming a buyer group and committing to buy exclusiv...

This paper describes the efforts to develop a modular bidding and procurement application and to integrate the system with a broker service for tiles and related products in the supply chain of the tile industry by means of the case study of an Austrian tile layer. The main drawbacks of the as-is situation as well as the requirements and envisaged to-be processes are briefly outlined. Furthermo...

The thermomechanical behavior of damaged space shuttle tile thermal protection system is determined using the finite element method. The relative effects of damage on the thermal protection capability and the induced thermal stresses in the TPS are determined by comparing the thermal and structural response of the damaged configurations with the undamaged configurations. The TPS, consisting of ...