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Search Results: 1 - 10 of 325222 matches for " S. Ahamadi-kandjani "
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Spontaneous formation of optically induced surface relief gratings
H. Leblond,R. Barille,S. Ahamadi-kandjani,J. -M. Nunzi,E. Ortyl,S. Kucharski
Physics , 2009, DOI: 10.1088/0953-4075/42/20/205401
Abstract: A model based on Fick's law of diffusion as a phenomenological description of the molecular motion, and on the coupled mode theory, is developped to describe single-beam surface relief grating formation in azopolymers thin films. It allows to explain the mechanism of spontaneous patterning, and self-organization. It allows also to compute the surface relief profile and its evolution in time with good agreement with experiments.
Knowledge and Beliefs of Couples attending Marriage Counseling Centers toward correct sexual relationships
Noohi S,?Azar M,?Shafiee Kandjani AR,?Tajik A
Hayat Journal of Faculty of Nursing & Midwifery , 2007,
Abstract: Background & Aim: Inter-partner relationships as part of a somatic-affective interaction have important role in supporting of familial relations. In this regard, knowledge of couples about their specific role against their spouses and the ways of having correct sexual relationship is essential. This correct knowledge might help spouses to understand their husband/wife and would promote family's cultural status and would be transmitted to next generations. This study carried out to determine the knowledge level and beliefs of couples attending marriage counseling centers toward correct sexual relationships. Methods & Materials: This is a cross-sectional study. A total of 300 individuals (150 couples), attending marriage counseling centers in the north and east of Tehran recruited for the study using random selection method. Data were collected using a questionnaire including knowledge and beliefs assessment questions. Results: Mean knowledge score for men and women were 12.3±2.5 and 10.1±1.8, respectively (P=0.23). Knowledge level of participants with higher education (P=0.00); and those aged 25-29 years (P=0.65) were higher than others. 11.3% of women and 13.1% of men did not have appropriate attitudes toward correct sexual relationships (P=0.35).Conclusion: Although knowledge level of respondents was just above the half of the complete score, the overall beliefs toward sexual relationships were positive.
Nutritive Value, Metabolizable Energy and Viscosity of Kitchen-waste on Broiler Chicken Performance
A.A. Saki,M.M. Tabatabie,A. Ahamadi,S.A. Hossenin Sayer
Pakistan Journal of Biological Sciences , 2006,
Abstract: Kitchen-waste could be used in poultry feeding. One hundred and eighty Arian day old chickens were placed in 4 treatments, includes 4 replicates and 23 chickens in each. Treatments were consisted in (0, 10, 20 and 30%) kitchen-waste which was used after processed. Gross and metabolizable energy in kitchen-waste were 4300 and 1999 kcal kg-1, respectively. No significant differences were observed in body weight, weight gain and feed conversion ratio in 42 days of age. In contrast feed intake was significantly (p<0.05) higher in 10% of kitchen waste compared to other treatments. Brest meat was significantly greater (p<0.05) in kitchen-waste diets than control. The similar trend was shown in intestinal viscosity. The result of this study has shown that kitchen-waste could be used 10% in broiler feeding without any adversely effect.
Multistate polarization addressing using one single beam in an azo polymer film
S. Ahmadi Kandjani,R. Barille,S. Dabos-Seignon,J. -M. Nunzi,E. Ortyl,S. Kucharski
Physics , 2005, DOI: 10.1364/OL.31.001923
Abstract: Peculiar light-matter interactions can break the rule that a single beam polarization can address only two states in an optical memory device. Multistate storage of a single beam polarization is achieved using self-induced surface diffraction gratings in a photo-active polymer material. The grating orientation follows the incident light beam polarization direction. The permanent self-induced surface relief grating can be readout in real time using the same laser beam.
Nonlocal communication with photoinduced structures at the surface of a polymer film
R. Barille,S. Dabos-Seignon,J. -M. Nunzi,S. Ahmadi Kandjani,E. Ortyl,S. Kucharski
Physics , 2006, DOI: 10.1364/OPEX.13.010697
Abstract: Nonlocal communication between two laser light beams is experimented in a photochromic polymer thin films. Information exchange between the beams is mediated by the self-induction of a surface relief pattern. The exchanged information is related to the pitch and orientation of the grating. Both are determined by the incident beam. The process can be applied to experiment on a new kind of logic gates.
Incoherent light induced self-organization of molecules
S. Ahmadi Kandjani,R. Barille,S. Dabos-Seignon,J. -M. Nunzi,E. Ortyl,S. Kucharski
Physics , 2005,
Abstract: Although coherent light is usually required for the self-organization of regular spatial patterns from optical beams, we show that peculiar light matter interaction can break this evidence. In the traditional method to record laser-induced periodic surface structures, a light intensity distribution is produced at the surface of a polymer film by an interference between two coherent optical beams. We report on the self-organization followed by propagation of a surface relief pattern. It is induced in a polymer film by using a low-power and small-size coherent beam assisted by a high-power and large-size incoherent and unpolarized beam. We demonstrate that we can obtain large size and well organized patterns starting from a dissipative interaction. Our experiments open new directions to improve optical processing systems.
Light mediated emergence of surface patterns in azopolymers at low temperatures
V. Teboul,R. Barille,P. Tajalli,S. Ahmadi-Kandjani,H. Tajalli,S. Zielinska,E. Ortyl
Physics , 2015, DOI: 10.1039/C5SM00846H
Abstract: Polymer thin films doped with azobenzene molecules do have the ability to organize themselves in spontaneous surface relief gratings (SRG) under irradiation with a single polarized beam. To shed some light in this still unexplained phenomenon, we use a new method that permits us to access experimentally the very first steps of the pattern formation process. Decreasing the temperature, we slow down the formation and organization of patterns, due to the large increase of the viscosity and relaxation time of the azopolymer. As a result decreasing the temperature allows us to access and study much shorter time scales,in the physical mechanisms underlying the pattern formation, than previously reported. We find that the patterns organize themselves in sub-structures which size increase with the temperature, following the diffusion coefficient evolution of the material. That result suggests that the pattern formation and organization is mainly governed by diffusive processes, in agreement with some theories of the SRG formation. Decreasing further the temperature we observe the emergence of small voids located at the junction of the sub-structures.
高运载率情况下水平管道内气—固二相平稳湍流运载能力下降的研究
Esmailzadeh-Kandjani,栗小华
力学进展 , 1979, DOI: 10.6052/1000-0992-1979-3-J1979-032
Abstract: 很久以来,用气动力输送颗粒已为人们所熟知并利用,对于气-固二相流做了大量的研究,但都是限于运载率很小的情况。根据实践的需要,我们在这儿所提出来研究的却是高运载率(q=q_s/q_g>10)的流动。把动量定理分别应用于流体和固体颗粒两相并利用连续方程,得到了两个微分方程,可用以计算作为横坐标x的函数的压力p,浓度c和固体与流体速度比φ=U_s/U_g。
Evaluation of Health Outcomes with Relation to Intimate Partner Abuse among Pregnant Women Attending Gachsaran Hospitals in 2007
M. Dolatian,M. Gharache,M. Ahamadi,J. Shams
Qom University of Medical Sciences Journal , 2009,
Abstract: Background and ObjectivesIntimate partner abuse during pregnancy is a major problem associated with a variety of negative health outcomes. However, this relationship has not been adequately explored, especially in the developing countries. The present study seeks to determine the relationship between of intimate partner abuse and reproductive health outcome among pregnant women attending Gachsaran Hospitals in 2007.MethodsThis is a correlation descriptive study performed on 500 pregnant women attending Gachsaran hospitals chosen by convenience sampling. The data collecting instrument was a questionnaire which was completed by the researchers and consisted of the section: demographic characteristics of samples and their partners, questions related to abuse screening and information of health outcome. Validity and reliability of the tool were respectively established using content validity and test-retest technique.ResultsThe findings of this study indicated that 48/6% of women during pregnancy had suffered abuse from their husbands and there were significant correlations between abuse and unwanted pregnancy, inadequate prenatal visit, short birth interval, lack of use of contraceptive methods and delay in the initiation of breast feeding. (>p0.05 ). ConclusionAccording to the results of this study, intimate partner abuse can negatively affect reproductive health of pregnant women. It is therefore, necessary to detect cases of intimate partner violence at a primary health care level. Keywords: Violence; Outcome Assessment (Health Care); Pregnancy.
MENTAL HEALTH STATUS OF EMPLOYEES IN SUBSTATIONS OF ELECTROMAGNETIC FIELDS AT EXTREMELY LOW FREQUENCY IN TEHRAN
A. R. Zahiroddin, A. R. Shafiee Kandjani, N. Mahdavi Hezaveh
Iranian Journal of Environmental Health Science & Engineering , 2006,
Abstract: With regard to the relationship between exposure to electromagnetic fields and development of potential biological system impairments and increasing number of these fields, the current research was conducted in 2004 on 101 employees of high voltage centers to determine the role of working in these fields on mental health. One hundred and one employees were exposed to electromagnetic field at 50 Hz found from 230 kV current.We used SCL-90-R test and compared the subjects with the control group.Data analysis showed that the mean scores of the case group in Global Severity Index and Positive Symptom Total with significant difference were higher than that of the control group (P<0.022 and P<0.049). Positive Symptom Distress Index showed no significant difference between the two groups. Cases had also higher scores in all subscales in comparison with the control group. It was statistically significant for subscales of somatization, depression, anxiety, hostility and phobia. For psychoticism with P>0.05 it tended not to be significant. No correlation was found between age, marital status and split-shift working with GSI scores. Employment in electromagnetic fields at extremely low frequency can lead to the development of mental disorders. However, the results need confirmation by other controlled trials.
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