Microsatellites known as “CubeSats” have recently been developed to enable comparatively inexpensive and timely access to space for small payloads. As a new standard for small satellites, the CubeSat has shown great promise for space applications such as earth observation, planetary science and space physics mission. In this paper a “CubeSail” mission – a CubeSat deployed with a solar sail –for...

The paper describes and illustrates a multi-step perturbation (MSP) method for accurately and quickly computing changes in the real cost of living, ∆ct, as nominal prices change over observation periods. As prices change, for a given nominal income, a representative consumer moves from one utility-maximizing point to another in combined income and substitution effects. By definition, ∆ct is an ...

background: in this study, specific measures of extended nursing services and its values on patients with bladder cancer after endoscopic bladder electrosection were examined. methods:   sixty-six patients diagnosed with bladder cancer in laiwu people's hospital(no. 001, xueyehu street, changshao road, laiwu, shandong, china) between february 2012 and february 2014, and underwent endoscopic bla...

An optimization problem for systems that are subject to perturbations where both state observations and control actions are impulsive is here addressed. The dynamics equation is given by a differential inclusion ( ) ( , ( )) x t F t x t ∈ and the optimal strategy is the minimizer of the worst viable perturbation process (minimax). Such formulation is appropriate when noise is barely known but l...

We report the observation of a new c-type band of ~D2O!3 at 583.215 92~37! GHz, which we assign to the k5620←610 torsional hot-band. The new data includes the first observation of K50 states for the k511 and k522 levels and effects a correct assignment of these states. A new perturbation was observed for the K52 states of the k5120←210 subband splitting each transition into two equally spaced e...

We define a scalar measure of the local expansion rate based on how astronomers determine the Hubble constant. Our observable is the inverse conformal d’Alembertian acting on a unit “standard candle.” Because this quantity is an integral over the past lightcone of the observation point it provides a manifestly causal and covariant technique for averaging over small fluctuations. For an exactly ...

In this paper, we investigate a singular perturbation problem including a fourth order O.D.E. with general linear boundary conditions. Firstly, we obtain the necessary conditions of solution of O.D.E. by making use of fundamental solution, then by compatibility of these conditions with boundary conditions, we determine that, for given perturbation problem, whether boundary layer is formed or not.

‎ in this paper, we investigate stability analysis of fractional differential systems equipped with the conformable fractional derivatives. some stability conditions of fractional differential systems are proposed by applying the fractional exponential function and the fractional laplace transform. moreover, we check the stability of conformable fractional lotka-volterra system with the multi-st...

an attempt is made for the first time to solve the quadratic and cubic model of magneto hydrodynamic poiseuille flow of phan-thein-tanner (ptt). series solution of magneto hydrodynamic (mhd) flow is developed by using homotopy perturbation method (hpm). results are presented graphically and the effects of non-dimensional parameters on the flow field are analyzed. the results obtained reveals ma...