Currently most modern dc rapid transit systems around the world use running rails or a negative rail as the negative return circuit for the dc traction current. These rails are intentionally kept ungrounded from ground (earth) by using insulating material between the rail and earth to minimize dc stray current. This configuration of return current rail develops varying voltage with respect to g...

the black-striped pipefish, syngnathus abaster, is a species of the syngnathidae family. this study provides data on the morphometric, meristic and genetic structuring of the caspian sea pipefish, syngnathus abaster. eight morphometric characteristics based on total length and five morphometric characteristics based on standard length were analyzed. a total of 50 specimens were collected in bra...

The objective of this study was to determine the dynamics and relative body weight (BW) changes after parturition and their relationships to milk yield in Holstein (H) and Czech Fleckvieh (F) cows, and also the relationships between their BW changes in the first 8 weeks of lactation and reproductive performance. A retrospective, observational study comprised analyses of individual cow records f...

In order to improve the accuracy and real-time performance of automatic cleaning groove rails in modern trams, this paper proposes a rail region extraction algorithm based on improved Hough transform. First, speed up detection remove noise, performs series pre-processing images collected by camera, then use Canny edge method extract feature information rail. Finally, is basis traditional transf...

Sixty-one primiparous sows were used to determine the response of mammary gland growth to different energy and protein intakes during lactation. After birth, litter size was set to 9 or 10 pigs. Sows were slaughtered at selected times up to 30 d of lactation. Individual sows were fed one of four diets that were combinations of different amounts of energy and protein (3.0 Mcal ME and 8.0 g lysin...

The objective of this study was to determine the relationships among daughter clinical mastitis during first and second lactations and sire transmitting abilities for somatic cell score, udder type traits, productive life, and protein yield. Data on clinical mastitis during first lactation were available for 1795 daughters (in six Pennsylvania herds, one Minnesota herd, and one Nebraska herd) o...

Ten Large White x Landrace sows were used to measure changes during lactation of composition of the milk. Milk composition on day 5, 12, 19 and 26 of lactation included 195.7, 192.2, 185.4 and 184.1 g of dry matter kg, 59.3, 55.8, 55.1 and 54.8 g of crude protein kg and 1.3, 1.18, 1.16 and 1.17 Mcal of gross energy kg, respectively. Dry matter, crude protein and gross energy levels in the milk ...