natural frequencies of simple systems

... crucial overlap of their results and their applications, is the very soul of precision physics of simple atoms Study of simple atoms is also of a methodological interest since theory of hydrogen ... Physics of Simple Atomic Systems (PSAS 2002) whose primary target was to provide an effective exchange between physicists from different fields From the early days of modern physics, studies of simple ... 207 208 Appendix: Proceedings of International Conference on Precision Physics of Simple Atomic Systems (St Petersburg, 2002) – Table of Contents Canadian Journal of Physics 80(11) (2002) ...

Ngày tải lên: 11/04/2014, 13:09

... probability tending to 1, the maximum degree ∆ of G satisfies ∆ < nk−1−1/ρ Let us now delete the edges of a maximal collection of edge disjoint copies of members of F from Gp The resulting k-graph Gp ... maximum degree ∆ have an independent set of size at least c(n/∆1/2 )(log ∆)1/2 where c is a constant Simple hypergraphs share many of the complexities of (more general) hypergraphs but also have ... hypothesis Indeed, the condition of simplicity is the same as saying that the 3-graph is F -free, where F is the 3-graph of two edges sharing two vertices The proof of the lower bound in Theorem...

Ngày tải lên: 07/08/2014, 21:20

... during the months of non-trapping The fall of In(2L)t and In(3L)P frequencies would probably be a consequence of a weaker resistance to cold or to a shorter life-span of the carriers of these inversions ... wandering fluctuations of In(3L)P frequencies, together with the lack of samples for some months, allowed a great variety of periodic series to fit the data In any case, the finding of a figure shape, ... to check the correlation of macroclimatic data with the inversion frequencies The correlation coefficients of Spearman (rs were calculated between the serial frequencies of each inversion ) lsdf...

Ngày tải lên: 14/08/2014, 20:20

... Progression of Liver Fibrosis In the setting of persistent hepatitis C viremia, the rate of progression of liver fibrosis varies widely There have been extensive studies focusing on the natural course of ... onset of symptoms, approximately to months after exposure Up to 30% of patients will test negative for anti-HCV at onset of their symptoms, making anti-HCV testing unreliable in diagnosis of acute ... symptoms of jaundice (p=0.03).[25] Furthermore, the long-term followup study of women infected with contaminated Rh immune globulin in Germany exhibited a rate of chronicity in 43% of those with...

Ngày tải lên: 02/11/2012, 09:56

... boundaries, etc.) Examples of open systems are: groundwater systems, social systems, as well as most of the natural systems Four types of variables characterize a model of a system (Kramer and De ... validation of numerical models of natural systems is impossible This is because the natural systems are never closed and model results are always non-unique The openness of natural systems is ... five different types of integration within the framework of Integrated Assessment Modelling (IAM) These are integrations of disciplines, of models, of scales, of issues, and of stakeholders Scrase...

Ngày tải lên: 06/11/2012, 10:35

... walls of office buildings and the floors of residential units for temperature control, while only distributing the volume of air required for ventilation This decoupled system allows for 100% of ... (0.3048 m) off of the rear wall as shown in Figure 4, which gives an area of 2.25 ft2 (0.2090 m2) for each vent Case has a volume of 1,368 ft3 (38.74 m3) By meeting the guidelines of four air ... The outlet vent area of Case is double the size of the outlet vent area of Case Each outlet vent is of the size, 9" × 36" (0.2286 m × 0.9144 m) spaced 12", giving an area of 4.5 ft2 (0.418 m2))...

Ngày tải lên: 05/09/2013, 15:28

... (NSTDA); iii Office of the Basic Education Commission (OBEC); iv Office of the Non-formal and Informal Education (ONIE); v Vocational Education Commission (VEC); NSTDA (2008) Memorandum of understanding ... rate the quality of the training on a scale of 1-10 ranging from poor to excellent and the degree of adequacy of the knowledge acquired from the training sessions on a scale of 1-10 ranging from ... description The study analyses a project engaged in the diffusion of PV systems to rural areas The PV systems in focus are stand-alone or off-grid installations designed to be used in remote areas where...

Ngày tải lên: 05/09/2013, 16:10

... to the high price of PV modules, even if it has declined steadily since 1985 [6] Due to the minimal maintenance of PV systems and the absence of real benefits of economies of scale during construction, ... two principal PV systems described in the following sections are the grid connected (or on-grid) systems and the stand alone systems (or off-grid) systems 3.5.1 Grid connected systems In grid ... the basis of the power delivered under Standard Testing Conditions (STC) of 1kW/m² of sunlight and a PV cell temperature of 25°C Their output measured under STC is expressed in terms of “peak...

Ngày tải lên: 05/09/2013, 16:10

... invented the method of automatic control of the weaving of fabrics with a loom machine by using punch cards and this method was the beginning of the concept of NC The concept of NC was actually ... role of controlling the machine’s behavior with the exception of servo control Figure 1.13 shows the conceptual architecture of CNC machine tools from the hardware and software points of view Software ... developing Soft-NC is the scheduling that satisfies the execution of the software modules in real time Recently, NC systems have advanced from being closed systems to being open and distributed systems...

Ngày tải lên: 08/09/2013, 20:50

... consisting of various computers, storage systems, application software, and databases Design of a new application for an existing database or design of a brand new database starts off with a ... recovery subsystems of a DBMS Economies of Scale The DBMS approach permits consolidation of data and applications, thus reducing the amount of wasteful overlap between activities of data-processing ... Users simple UNIVERSITY database example to illustrate our discussion Section 1.3 describes some of the main characteristics of database systems, and Sections 1.4 and 1.5 categorize the types of...

Ngày tải lên: 07/12/2013, 11:33

... 64MB of memory, and GB of disk space On newer computers the performance of the operating system is extremely fast The list below gives some idea of the capabilities, but complete lists of supported ... list of some of the more important directories follows with a brief description of each Most users have their home directories under the ’/home’ directory Most of the other directories are of interest ... includes many of the applications that would be desired by the average user Most of the listed applications are free, with the exception of the games Many of these packages are a standard part of Linux...

Ngày tải lên: 22/12/2013, 20:17

... types of control systems: (a) Man-made control systems (b) Natural, including biological-control systems (c) Control systems whose components are both man-made and natural ANALYSIS AND DESIGN OF ... human body Some type of control systems affects most aspects of our day-to-day activities This chapter presents a brief introduction and overview of control systems Some of the terms commonly ... INTRODUCTION TO CONTROL SYSTEMS 1.1 INTRODUCTION Control systems in an interdisciplinary field covering many areas of engineering and sciences Control systems exist in many systems of engineering, sciences,...

Ngày tải lên: 01/01/2014, 18:43

... reactive power is to maintain voltage stability/security of power systems The effect of reactive power on system reliability in terms of energy not supplied is indirect and should be calculated ... diagram of IEEE 30-bus system There are two generation buses in the system Generation bus consists of 4×60MW units Generation bus consists of 3×40MW units In order to illustrate the effect of reactive ... Costas, Voltage Stability of Electric Power Systems, Boston/London/Dordrecht: Kluwer Academic Publishers, 1998 R Billinton, R N Allan, Reliability Evaluation of Power Systems, 2nd ed., New York...

Ngày tải lên: 03/01/2014, 19:39

... problematic of solving linear systems of interval equations We will then introduce a new formulation of the problem, based on interval parameters which is adapted for the modeling of mechanical systems ... Interval Computations Applied to FEM amount of computations on simple discrete systems, as well as the accuracy of the solutions RESOLUTION OF INTERVAL LINEAR SYSTEMS The interval arithmetic has been ... point of view, and the others often encounter convergence problems Moreover, only the mean value and the moments (often the variance only) are known, and since the density of probability of the...

Ngày tải lên: 12/01/2014, 21:45

... Background • Parameter estimation is a key step in development of mathematical models • Models of interest may be ODEs/DAEs • Minimization of a weighted squared error r φ = θ,z µ s.t (zµ,m − zµ,m )2 ... extension of a function f (x) over X F (X) ⊇ {f (x) | x ∈ X} • Natural interval extension – leads to overestimation (dependence problem) Taylor Models • Taylor Model Tf – an interval extension of a ... possible to compute Taylor models of complex functions Taylor Models - Range Bounding • Exact range bounding of the interval polynomials – NP hard • Direct evaluation of the interval polynomials –...

Ngày tải lên: 12/01/2014, 22:03

... Background • Parameter estimation is a key step in development of mathematical models • Models of interest may be ODEs/DAEs • Minimization of a weighted squared error r φ = θ,z µ s.t (zµ,m − zµ,m )2 ... extension of a function f (x) over X F (X) ⊇ {f (x) | x ∈ X} • Natural interval extension – leads to overestimation (dependence problem) Taylor Models • Taylor Model Tf – an interval extension of a ... possible to compute Taylor models of complex functions Taylor Models - Range Bounding • Exact range bounding of the interval polynomials – NP hard • Direct evaluation of the interval polynomials –...

Ngày tải lên: 12/01/2014, 22:16