The present study aimed to estimate the effects of parity, calving season and year of calving on the prevalence of subclinical mastitis in Holstein cows. A total of 2682 records from 869 Holstein cows in a large dairy farm (Azarbaijan province, Iran), respecting the period from 2006 to 2009, were collected. Data was analyzed using Proc Mixed of SAS software by MIVQUE method. Subclinical mastiti...

Stimuli from the road surface cause car vibrations. The suspension system ensures vehicle’s stability and smoothness when moving. In this research, author introduces use of active with a hydraulic actuator to improve comfort cars. Car oscillations are described based on quarter-dynamics model five state variables. Besides, nonlinear system’s SM (sliding mode) control algorithm is used system. a...

Suspension system is an important part of the car design, because it influences both the comfort and safety of the passengers. In the paper an active suspension using linear electric motor is designed. In particular, the article is focused on experiments with active suspension – developing an appropriate input signal for the test sand and evaluation of the results. Second important point of the...