In this paper, limit sets of trajectories a discontinuous vector field Z defined on two-dimensional manifold M are studied. As in the classical Poincaré–Bendixson theorem, supposed to be confined some compact invariant set $$K\subset V$$ , where V is coordinate neighborhood M, and we require that K fulfill hypotheses analogous referred theorem. More precisely, split an arbitrary number regions ...

in this research a three dimensional model is explained which simulate the oil spill behavior inseas. this model is the developed version of previous two-dimensional study of aghajanloo et al., 2013.because of three-dimensional nature of the oil dispersion/movement in water, this is a more realistic model of oil spill transport and fate in marine environment. the model is based on eulerian appr...

six-sigma has some measures which measure performance characteristics related to a process. in most of the traditional methods, exact estimation is used to assess these measures and to utilize them in practice. in this paper, to estimate some of these measures, including defects per million opportunities (dpmo), defects per opportunity (dpo), defects per unit (dpu) and yield, a new algorithm ba...

the rapid scaling in modern cmos technology has motivated the researchers to design new analog-to-digital converter (adc) architectures that can properly work in lower supply voltage. an exchanging the data quantization procedure from the amplitude to the time domain, can be a promising alternative well adapt with the technology scaling. this paper is going to review the recent development in t...

the compact finite difference schemes have been found to give simple ways of reaching the objectives of high accuracy and low computational cost. during the past two decades, the compact schemes have been used extensively for numerical simulation of various fluid dynamics problems. these methods have also been applied for numerical solution of some prototype geophysical fluid dynamics problems ...

We introduce a flow approach to the generalized Loewner-Nirenberg problem (1.5)-(1.7) of $$\sigma _k$$ -Ricci equation on compact manifold $$(M^n,g)$$ with boundary. prove that for initial data $$u_0\in C^{4,\alpha }(M)$$ which is subsolution (1.5), Cauchy-Dirichlet (3.1)-(3.3) has unique solution u converges in $$C^4_{loc}(M^{\circ })$$ $$u_{\infty }$$ (1.5)-(1.7), as $$t\rightarrow \infty $$ .

    Six sigma,   Rolled throughput yield, Organizational performance Six Sigma is a well- established approach to improve the capability of business processes in order to gain satisfaction of customers. The performance assessment of a given process is essential to some phases of six sigma methodology. So far, different indicators are used to demonstrate the performance of a process, while many ...