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 หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Study of Stress Distribution in the Tibia During Stance Phase Running Using the Finite Element Method) ผู้เขียน: Thepwachara Ruchirabha,  ดร.ธำรงค์ พุทธาพิทักษ์ผล, รองศาสตราจารย์ , ดร.สิริพร ศศิมณฑลกุล, ผู้ช่วยศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractTibia fractures are common in the elderly who have osteoporosis. Stress distributions in the tibia of two osteoporosis patients were studied to investigate the cause of this fracture and the effects of contact areas on the distal end of the tibia, body weight and knee flexion angles on the tibial stresses were determined using finite element analysis. Three-dimensional tibial models were constructed from computed tomography images of legs using the Mimics V.10.01 program and the Geomagic V.10 program. These models were imported to the Catia V.5 program to perform the finite element analysis for determining stress distributions in the tibia. The finite element models showed that the maximum von Mises stress found on the tibia of the female patient was higher than in the male patient since the contact area on the distal end of the female was smaller than in the male. Furthermore, the maximum von Mises stress occurred near the middle of the posterior tibia at 30? knee flexion and was slightly shifted toward the medial tibia during 30–90? knee flexion. As body weight increased, the maximum von Mises stress also increased. Moreover, the maximum von Mises stresses obtained from the smaller contact area were 17.6–25.2% (for a female patient) and 14.5–19.9% (for a male patient) higher than those determined from a larger contact area. |
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หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Effects of Using Eggshell Waste as a Calcium Source in the Diet of Rhode Island Red Roosters on Semen Quality, Gonadal Development, Plasma Calcium and Bone Status) ผู้เขียน:ดร.นิรัตน์ กองรัตนานันท์, รองศาสตราจารย์ สื่อสิ่งพิมพ์:pdf AbstractA 10 wk trial was conducted to investigate the effect of using ground, sterilized eggshell as a calcium source in breeder male diets. Live performance, semen quality, gonadal and visceral organ characteristics, plasma calcium concentration and bone mineralization were evaluated. Forty-five Rhode Island Red cockerels aged 25 wk were caged individually in a conventional open-sided house. The birds were randomly divided into three groups, each group consisting of 15 birds. Group 1 (Control) was provided with a standard breeder ration which contained all the calcium carbonate as fine limestone, whereas Groups 2 and 3 were placed on diets in which 50% and 100%, respectively, of the limestone was replaced with ground eggshell. The birds were given free access to food and water, and exposed to a 16L:8D photoperiod. Throughout the study, body weight, feed consumption, spermatocrit, semen volume, sperm concentration and total sperm number/ejaculation of the three bird groups were not significantly (P > 0.05) different. Seminal plasma pH and Ca++ concentration were not affected by dietary treatments. Autopsies at the end of the study showed that comb weight, testes weight, ductus deferens weight and length, and giblets weight of the birds did not differ among the treatment groups. In addition, packed cell volume and plasma calcium and phosphorus concentrations did not exhibit a difference among cockerels fed the different calcium sources. No significant differences were found in any aspect of the tibia parameters (weight, length, breaking strength and ash content). The weights and lengths of the humerus from the three bird groups were comparable whatever the calcium source. Similar observations were also found in the parameters of the tarsometatarsus and keel bones. It was apparent that eggshell can be fully used as a calcium source in diets without any detrimental effects on the live performance, semen quality, reproductive development and calcium homeostasis of breeder male chickens. |
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Researcherดร. สิริพร ศศิมณฑลกุล, ผู้ช่วยศาสตราจารย์ที่ทำงาน:ภาควิชาวิทยาศาสตร์การฟื้นฟูและการเคลื่อนไหว คณะวิทยาศาสตร์การกีฬา สาขาที่สนใจ:ชีวกลศาสตร์, วิเคราะห์ท่าทางการเคลื่อนไหวของนักกีฬาและบุคคลทั่วไป, การออกกำลังกายเพื่อสุขภาพและป้องกันโรค, พัฒนานวัตกรรมทางด้านสุขภาพและกีฬา Resume |