In this paper, we study an (n-k+1)-out-of-n system by adopting their components to be statistically independent though nonidentically distributed. By assuming that at least m components at a fixed time have failed while the system is still working, we obtain the mixture representation of survival function for a quantity called the conditional inactivity time of failed components in the system. ...

An oral sustained-release floating tablet formulation of metformin HCl was designed and developed. Effervescence and swelling properties were attributed on the developed tablets by sodium bicarbonate and HPMC-PEO polymer combination, respectively. Tablet composition was optimized by response surface methodology (RSM). Seventeen (17) trial formulations were analyzed according to Box-Behnken desi...

Objectives: This study aims to identify the burdens among wives of disabled people in the light of some independent variables. Methods: In this descriptive cross-sectional study, 197 domestic wives were surveyed using a standardized questionnaire to measure the burden among wives of disabled people. Data were collected using the independent variables and Zarit caregiver burden scale (ZCBS) for...

The aim of this study was to investigate the combined influence of 3 independent variables in the compression coated tablet of mesalamine for ulcerative colitis. A 3-factor, 3-level Box-Behnken design was used to derive a second order polynomial equation and construct contour plots to predict responses. The independent variables selected were: percentage of polymers (pectin and compritol ATO 88...

A time series is a realization of a sequence of a variable indexed by time. The notation we will use to denote this is xt, t = 1, 2, . . . , T . A variable is said to be “random” if its realizations are stochastic. Unlike cross-sectional data, time series data can typically not be modeled as independent across observations (i.e. independent across time). Rather, time series are persistent in th...

In this paper, one of the numerical solution method of one- particle, one dimensional timeindependentSchrodinger equation are presented that allows one to obtain accurate bound state eigenvalues and functions for an arbitrary potential energy function V(x).For each case, we draw eigen functions versus the related reduced variable for the correspondingenergies. The paper ended with a comparison ...

the present study intended to propose a causal model of factors that would predict oral communication apprehension (oca) of iranian learners of english as a foreign language. to conduct the study, 135 male and female university students majoring in english were selected. five variables including: learners’self-esteem and introversion/extroversion(as independent variables), their gender and prof...