Descripción de España : (obra del siglo XII)

Copia digital. Valladolid : Junta de Castilla y León. Consejería de Cultura y Turismo, 2009-201

Parameter Optimization In 3D Printer Recycle Machine

3D printing technology has evolved rapidly to becoming one of the most postulate method in manufacturing process. Commonly, standard manufacturing process which is subtractive that produces a lot of waste opposite to 3D printing technology is way friendly to the environment. The idea of this application additive manufacturing method in 3D printing leads to less or no wasted materials and consumption of plastic materials has significantly increased due to high demand in market. However, the plastic waste products from the 3D printing still undergo significant increase due to the problem in every human-made creation. In order to minimize the negative impact of plastic waste to the environment, a machine of recycle 3D printing has been made and study on parameter optimization on 3D printer recycle machine have been done. The study used Minitab software to analyze the factor of parameter of 3D printing recycle machine. Taguchi method was used to suggest some experiments to be performed and provides an optimal value for each parameter that needs to be optimized in the operation of extruding. Analysis of extruded filament was conducted for every 30cm with minimum of three repetitions. In comparison of the new extruding filament and original filament show that some minor difference of the mechanical properties by using tensile test method. Percentage of error for diameter of filament indicates that 1.77mm diameter with 1.14% as the lowest error while diameter of 1.82mm with 4.00% as the highest error. This shows that 3D printer recycle machine has been optimized with the percentage of error below than 5% and it could be further improved in order to help in minimizing the negative impact of plastic wastes to the environment

La investigación sobre el hidraulismo andalusí y los asentamientos localizados en el Alto Maestrazgo (Castellón)

Editada en la Fundación Empresa PúblicaLos asentamientos rurales andalusíes incluyen es sus áreas de influencia política zonas de residencia y espacios hidráulicos. Estos últimos, generalmente pequeños y medianos, son el resultado de un diseño previo, llevado a cabo por las comunidades campesinas a partir de la captación del agua y de las características físicas del territorio. En esta investigación, mediante diversas técnicas de trabajo de campo, junto con la documentación escrita y la toponimia, se analizan algunos sistemas hidráulicos localizados en el que fuera distrito administrativo andalusí de Culla (Castellón).Rural andalusí settlements include both residential and hydraulic zones in their areas the political influence. These hydraulic zones, usually small and medium-sized, are the result of a previous design carried out by the peasant communities and determined by water collecting and the features of the terrain. This paper focusses on some hydraulic systems located in the old andalusí administrative district of Culla in the Spanish province of Castellón. Different field work techniques along with toponyms, documents and other references Me used in this research.Publicad

The Nile: its role in the fortunes and misfortunes of the Fatimid dynasty during its rule of Egypt (969-1171)

The epoch spanning the years 935-1094 constitutes - on the whole - the longest and driest period on record in the history of the Nile. A stretch of relatively normal discharge followed this phase, only for dryness to return. The reasons of this dry-wet-dry phenomenon have been recently appraised in the context of global climatic changes – the so-called “Medieval Warm Period” - that affected most of the known world between the 11th and the 13th centuries. It was in this period of Egyptian history that the Shi‘i Isma‘ili Fatimids replaced the Sunni Ikhshidids as rulers in 358/969 and, with alternating fortunes, continued to reign until 567/1171. In this paper, I examine how, faced with the convergence of extraordinary geo-climatic factors, the Fatimids managed (and mismanaged) the Nile and its valley. I contend that the imperial aspirations of the Fatimids in Cairo and beyond were in many ways subject to the typical unpredictability of the natural cycles of the river, hence the Fatimids’ success and failure in managing the varied economic, political and trading activities that took place along the Egyptian section of the Nile valley. A case in point highlighted here will be the Fatimids’ privileging of flax cultivation over wheat

Unconstrained Minimization Algorithms for Functions with Singular Or Ill-Conditioned Hessian.

The minimization of an unconstrained, real and twice differentiable function f:R('n) (--->) R is considered. Interest is focused on situations when the Hessian matrix of f(x) is either singular or ill-conditioned at or near the minimum. Two algorithms are presented for h and ling such problems. The first uses the pseudoinverse concept together with a finite scheme developed for computing the pseudoinverse or any square matrix. Convergence of the algorithm is proved, and some of its properties are also discussed. The second algorithm is based upon the transformation of the original minimization problem into one of finding the asymptotic solution of a related differential system. This leads to a "duality" between ill-conditioned minimization problems and stiff systems of ordinary differential equations. This duality is investigated and techniques for integrating stiff systems of ordinary differential equations are used for implementing a viable minimization algorithm. A study of the tradeoffs between speed and accuracy shows that stiff methods with only moderate levels of accuracy are required. This is an encouraging note since it eliminates the need for methods with high accuracy which tend to be computationally expensive due to the small stepsize that is often associated with them. Also since the Hessian matrix is real and symmetric, its eigenvalues are always real. Thus the stability problems, associated with the presence of some complex eigenvalues, do not exist here. This makes stiff integration schemes even more effective. Finally, a parameter identification problem, that is associated with an adaptive controller for the path control of surface ships in restricted waters, is solved using the two developed algorithms. Comparisons with the conjugate gradient method indicate the viability of the new algorithms.Ph.D.Industrial engineeringUniversity of Michiganhttp://deepblue.lib.umich.edu/bitstream/2027.42/158389/1/8125055.pd

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