The main purpose of cementing of the well is to provide effective zonal isolation for the entire life of wells. The standard cements cannot prevent loss of zonal isolation when the stress level in the well cement is severely fluctuated. Since elastic cements improve elastic properties, recently, a number of studies have been done in this area. For this purpose, a nanoparticle, named EX-RIPI, wa...

We define rationally additive semirings that are a generalization of (ω)complete and (ω-)continuous semirings. We prove that every rationally additive semiring is an iteration semiring. Moreover, we characterize the semirings of rational power series with coefficients in N∞, the semiring of natural numbers equipped with a top element, as the free rationally additive semirings.

A greenhouse study was conducted to investigate the effects of nitrogen (N) on wild barley (Hordeum spontaneum Koch) interference with winter wheat (Triticum aestivum var. Pishtaz) by an additive series experiment. The experiment was conducted in a split plot design with 3 replications. Wheat plant height losses were on average 30, 10, and 10% in a wild barley density of 16 plants per pot with ...

In this paper, an additive self-tuning (ST) control scheme is presented for a static synchronous series compensator (SSSC) to improve performance of conventional PI control system for damping sub-synchronous resonance (SSR) oscillations. The active and reactve series compensation are provided by a three-level 24-pulse SSSC and fixed capacitor. The proposed ST controller consists of a pole shift...

In this article, we obtain the analytic continuation of multiple shifted Lucas zeta function, L-function associated with Dirichlet characters and additive characters. We then compute a list possible singularities residues these functions at poles. Further, show rationality L-functions quadratic negative integer arguments.

In the present paper we shall examine the real-time restoration of biomedical signals under additive noises. Biomedical signals measured by instruments such as catheter manometers, ambulatory electrocardiographs and thermo-dilution sensors are susceptible to distortion and noise. Therefore, such signals must be restored to their original states. In the present study, nonstationary biomedical si...

study of agronomic characteristics and advantage indices in intercropping of additive series of chickpea (cicer arietinum l.) and black cumin (nigella sativa l.) abstract in order to evaluate quantitive and qualitive yield of chickpea (cicer arietinum l.) and black cumin (nigella sativa l.) in intercropping of additive series, a field experiment was arranged in a randomized complete block desig...

in order to evaluate the effect of intercropping with replacement and additive series for hemp (cannabis sativa l.) and sesame (sesamum indicum l.), a field experiment was conducted during growing season 2006-07 at the agricultural research station of ferdowsi university of mashhad, iran. a randomized complete block design with three replications was used. treatments included different combinat...

Rehabilitation of the upper extremities, especially the hands, is critical for the restoration of independence in activities of daily living for individuals suffering from hand disabilities. There are currently two major challenges in developing robotic devices for hand rehabilitation: (1) design of a device that is compatible with the complex geometry and nonlinear biomechanics of the human ha...