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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Journal of Stress Analysis
- نوع مقاله: Journal Article
- کلمات کلیدی: finite element method,Micro-valve,Photo-thermal sensitive hydrogel,inhomogeneous swelling
- چکیده:
- چکیده انگلیسی: In this paper, the swelling of the photo-thermal sensitive cylindrical polyelectrolyte hydrogel micro-valve has been studied. For this purpose, a modified constitutive model that considers the polyelectrolyte nature of the photothermal sensitive hydrogels is used. The analytical solution for swelling of the hydrogel cylinder due to temperature and light intensity changes was presented. Then, in order to confront problems with realistic complicated boundary conditions, the finite element (FE) tool was implemented in ABAQUS software by scripting a UHYPER subroutine. Using the FE tool, the swelling of the hydrogel cylinder and contact of the micro-valve with the wall of the channel was investigated. Then, the temperature and the light intensity at which the channel was closed was obtained. Finally, opening valve parameter was studied for analyzing the geometrical influence of the under-study actuator, and the obtained results were discussed.
- انتشار مقاله: 08-04-1399
- نویسندگان: H. Mazaheri,A. Ghasemkhani,A.H. Namdar
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Industrial Mathematics
- نوع مقاله: Journal Article
- کلمات کلیدی: Filter,Pseudo-hoop algebra,n-fold obstinate pseudo-hoop,n-fold obstinate filter
- چکیده:
- چکیده انگلیسی: In this paper, we introduce the concepts of n-fold obstinate pseudo-hoop and n-fold obstinate filter in pseudo-hoops. Then we investigated these notions and proved some properties of them. Also, we discussed the relationship between n-fold obstinate pseudo-hoop and n-fold obstinate filter and other types of n-fold pseudo-hoops and n-fold filters such as n-fold(positive) implicative filter and n-fold fantastic filter in pseudo-hoops. For example, we proved that any $n$-fold obstinate filter is a maximal filter. Finally, we obtain a characterization of n-fold obstinate filters in terms of congruences and we show that any n-fold obstinate pseudo-hoop is an n-fold fantastic, n-fold positive implicative, n-fold implicative pseudo-hoop and simple pseudo-hoop.
- انتشار مقاله: 17-07-1396
- نویسندگان: R. A. Borzooei,A. Namdar,M. Aaly Kologani
- مشاهده
- جایگاه : پژوهشی
- مجله: Caspian Journal of Environmental Sciences
- نوع مقاله: Journal Article
- کلمات کلیدی: Caspian Sea,Lamprey,Induced reproduction,Hormonal changes
- چکیده:
- چکیده انگلیسی: The objective of this study was to determine the effect of human chorionic gonadotropin (hCG) on sexual maturation, plasma sex steroids (17β-estradiol, E2 and 17α-hydroxy progesterone (17α OHP)) and thyroid hormones (triiodothyronine, T3 and thyroxin, T4) levels in upstream - migrating Caspian lamprey. During the experiment, 36 fish (24 females and 12 males) in spring 2013 and 36 fish (24 females and 12 males) in fall 2013 were collected from the Shirud River estuary in Mazandaran Province, the Southern Caspian Sea during their upstream migration to the freshwater. All fish were injected with hCG at the doses of 1000, 1500 and 2000 IU.kg BW-1. The injection was a two - step process (50% of hormone in each step) by 12 h interval. After the first injection, fish were retained in the cages in the river beds and 24 hours after the second injection, fish were checked for egg and sperm release after mild abdomen pressure. Blood samples were taken for determining sex steroid levels. Results showed that hCG hormone injections caused increase in migration of germinal vesicle in the oocyte of female and sperm release in males. Significant differences were found in the serum E2 and 17α-OHP levels in hCG - injected fish compared to the control. However, no significant differences were found in serum T3 and T4 levels in the hCG - injected fish. According to the results, the appropriate hCG dosage to induce the reproduction acceleration in Caspian lamprey is 1500-2000 IU.kg BW-1.
- انتشار مقاله: 03-12-1395
- نویسندگان: M. Abedi,B. Mojazi Amiri,A. Abdoli,A. Javanshir,S. Benam,A. Namdarian
- مشاهده