## Archive for April, 2013

### Calculation

Welcome to all then: integral calculus. Integrate is the reciprocal process of the result, i.e., given a function f (x), looking for those functions F (x) that to be derived leading to f (x). It says, then F (x) is a primitive or antiderivada of f (x); said otherwise the primitives of f (x) is differentiable functions F (x) such that: F (x) = f (x). If a function f (x) is primitive, it has infinite primitives, differentiating them all in a constant. Indefinite integral is the set of the primitive infinite who can have a function. Do is represented by? f (x) dx. Do you read: integral of differential x x.? It is the sign of integration. f (x) is the integrating or function to be integrated.

DX is differential of x, and indicates what is the variable of the function to be integrated. C is the constant of integration and can take any real numerical value. If F (x) is an antiderivative of f (x) must be:? f (x) dx = F (x) + C to verify that the antiderivative of a function is correct enough with derive. Properties of the indefinite integral?do f (x) + g (x) dx =? f (x) dx +? g (x) dx immediate INTEGRALS of the derivation of elementary functions are deduced their corresponding immediate calls integrals. It is necessary to learn these results if you intend to be agile in the calculation of other less simple integrals.

1.?do f (x) + g (x) dx =? f (x) dx +? g (x) dx 2. do k f (x) dx = k? f (x) dx 2. If integrating by parts, we have a polynomial of degree n, we take it as u and the process is repeated n times. If we have an integral with only a logarithm or a bow, integrate by parts taking: v = 1.

### Calculation

Welcome, continue learning about attentive calculation. The emergence of the infinitesimal analysis was the culmination of a long process, whose internal mathematical essence consisted in the accumulation and theoretical assimilation of elements of the differential and integral calculus and the theory of series. The development of this process was available: algebra; techniques of calculation; Introduction to mathematical variables; the method of coordinates; ideas infinitesimal classic, especially of Archimedes; Quadratures problems; search for tangents the causes that motivated this process were, firstly, mechanics, astronomy and physics demands. In the resolution of problems of this genre, in search of general issues of resolution and in the creation of the infinitesimal analysis many scientists took part: Kepler, Galileo, Cavalieri, Torricelli, Pascal, Walis, Roberval, Fermat, Descartes, Barrow, Newton, Leibniz, and Euler. Keep on reading, these points are essential in differential calculus. At the level of the integral methods, acquired greater fame the geometry of the indivisible, created by Cavalieri, intended as a universal method of geometry. This method was established for the determination of the measures of flat figures and bodies, which are represented as elements comprising elements of lower dimension.

Thus, the figures consist of segments of straight parallel and the bodies of parallel planes. However, this method was unable to measure lengths of curves, because the corresponding indivisible (points) were dimensionless. Despite this, integration defined in the form of geometric Quadratures, gained fame in the first half of the 17TH century, due to the large number of problems that could be solved. The concept of calculus and its ramifications was introduced in the 18th century, with the great development that earned the mathematical analysis, creating branches as the calculating differential, integral and variations. This is the development the mathematics have been obtained from the man saw the need for, up to our days. Currently still lot of mathematicians in the development of mathematics known as modern mathematics, where their concepts are the basis of most of the current science. Perhaps to confuse a little so much information on this topic in particular which is the calculation, but little by little we can understand and know what it is to be able to handle it.

### Consultation

A very good consultation on the part of a visitor to my Blog originated this article which I hope to many. Procedure for the calculation of the readjustment of the canon of lease. Today in Chile, almost no longer residential lease contracts that are expressed in dollars if not that, like corporate or commercial leases these are already working with our known UF. This phenomenon has occurred by the great economic stability Chile has grown through the years and increasingly have expanded deadlines for readjustments in lease contracts reaching even parameters do it once a year. Therefore, lately housing rental contracts are have been drafted in UF achieving a monthly adjustment without having to be constantly and every 3 months calculating the new value of monthly rental for a residential property.

The benefits are numerous both for the owner and the lessee, and more comfortable for the real estate agent who leads the administrations of these buildings. It is thus as each tenant to arrive the date of payment stipulated in the contract of lease only you must multiply the value of the barrel expressed in UF the UF value that day and ready, your new canon’s lease is up to date. This allows the lessee to constantly know the value of your lease and frees the owner be constantly bothered to calculate the new lease even though this does not exempt him revise that that calculation your tenant has succeeded it. It should be noted that the variation of the CPI can be negative or positive depending on market fluctuations that affect the value of the goods and services involved for the monthly calculation of economic index so at times the value of the barrel down and others will rise depending on whether the CPI is being positive or negative for a particular month. Case of leases written in pesos, reset can be quarterly, half-yearly or yearly basis as they agreed by the parties at the time of closing the deal.

### Structural Analysis

Structural analysis consists in the verification of the resistance of the sections of a structure, which requires knowing the distribution of internal forces in the structure. The internal forces of a structure isostatic can be found with the equations of static equilibrium. In an indeterminate structure static equilibrium equations are not enough and must meet geometric conditions under load. The internal forces of a structure can be determined by means of elastic analysis or plastic overall analysis, although the latter serves only when certain conditions are satisfied. The internal forces are calculated using different methods, as you can disregard or not the effect of the deformation in the structure. In the first-order theory, calculations relate to the initial geometry of the structure (small deformations).

The forces acting on the bars vary not just with displacement. In the theory of second-order calculations refer to geometry deformed under load of the structure. The displacements of the structure and its effect on forces in the bars are not negligible. The theory of second order, more generally, is used for all cases without restrictions. If we apply the theory of first order, and structure materials satisfy Hooke’s law, we are in a case of linear calculation, where all movements vary linearly with the applied forces.

In this case, the superposition principle can be applied to tensions, deformations, internal forces and displacements due to different actions. The superposition principle says that displacement due to multiple loads acting simultaneously is equal to the sum of the displacements due to the action of each charge separately. This principle cannot be applied if the material stress-strain relationship is not linear, or if the structure (although the material obeys Hooke’s law) does not behave linearly due to geometry changes caused by the applied loads.

### That Is The Web Usability

Web usability is simply the degree of ease with which users have to use all the features of a web site. The greater or lesser degree of usability impacts directly in the mean time visit to a site, the percentage of bounce out (visitors who come but a few seconds will be, and what is worse, never return), and the effectiveness of the call to actions (which serve to tell the users what are the things that you want actually to do the user on your site). It seems easy, but not so much. Web usability experts must possess knowledge of graphic design, aesthetics, and physiology of the human being. Visual patterns influence greatly the effectiveness of various elements of the site. It follows, then, that the Visual elements of the site have much to do with usability. One of the most problematic issues in web usability are the forms. Many times it happens that once is to capture the attention and interest of the visitor, it seems that the webmaster or the owners of the sites it gives them a kind of anxiety to take full advantage of this contact.