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Search Results: 1 - 10 of 401216 matches for " M. Alaei "
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Fermi surface nesting and possibility of orbital ordering in FeO
M. Alaei,S. A. Jafari
Physics , 2009, DOI: 10.1016/j.physleta.2010.07.036
Abstract: We study FeO, a Mott insulator in GGA and GGA+U approximations. In the GGA we find a multi-band metallic state with remarkable inter-band nesting between two $t_{2g}$ bands of Fermi surface, which signals possible instability towards an orbital ordered insulating phase. Such broken symmetry state, although has lower energy than the underlying homogeneous metallic state, but the gap magnitude is less than the experimentally observed optical gap. Therefore we incorporate the calculated value of on-site Coulomb repulsion U on orbital ordered state. We find that symmetry breaking and Coulomb correlations cooperate together to stabilize the system and give an insulating orbital ordered state, with the gap magnitude very close to the experimental value. We propose this method as a possible indication of orbital ordering in LDA and GGA calculations. We check our method with known examples of LiVO$_2$ and LaMnO$_3$.
Asymptomatic Giardiasis in school children in Rey city
Rafiei M,Torkaman M,Sharbatdar Alaei MR
Tehran University Medical Journal , 2000,
Abstract: This cross-sectional descriptive study was undertaken to know the rate of intestinal parasites infestations in our school children population. A sum of 1155 fecal samples were analyzed from an equal number of children whose age were between 6-11 years old. The percentage of infestations were: Giardia lamblia (14.11%), hymenolepis nana (1.21%), ascaris lumbricoides (0.08%) and enterobius vermicularis (0.08%). We found no differences with regard to sex, age, father and mother levels of education, family size, body mass index (BMI) and the erythrocyte sedimentation rate (ER) between the stools positive and the stools negative cases. Nearly all cases of giardiasis (99.4%) were symptomatic. Eosinophilia was seen in (5.5%) of the infested children with giardiasis and in (0.5%) of the non-infested children, the difference was statistically non-significant (P=0.056). All cases of giardiasis (N=163) were treated with metronidazole 15 mg/kg/day in 3 divided doses for 7 days. Metronidazole was effective in (92.2%) of the treated children.
A Method for Clustering and Cooperation in Wireless Multimedia Sensor Networks
Mohammad Alaei,Jose M. Barcelo-Ordinas
Sensors , 2010, DOI: 10.3390/s100403145
Abstract: Wireless multimedia sensor nodes sense areas that are uncorrelated to the areas covered by radio neighbouring sensors. Thus, node clustering for coordinating multimedia sensing and processing cannot be based on classical sensor clustering algorithms. This paper presents a clustering mechanism for Wireless Multimedia Sensor Networks (WMSNs) based on overlapped Field of View (FoV) areas. Overlapping FoVs in dense networks cause the wasting of power due to redundant area sensing. The main aim of the proposed clustering method is energy conservation and network lifetime prolongation. This objective is achieved through coordination of nodes belonging to the same cluster to perform assigned tasks in a cooperative manner avoiding redundant sensing or processing. A paradigm in this concept, a cooperative scheduling scheme for object detection, is presented based on the proposed clustering method.
Therapeutic Efficacy of Garlic (Allium sativa) Against Burn Wound Infection by Pseudomonas aeruginosa
M. Arzanlou,R. Arab,R. Alaei
Research Journal of Biological Sciences , 2012,
Abstract: Treatment of multi-drug resistant Pseudomonas aeruginosa, which causes burn infection is a big challenge in clinics and needs novel strategies. Garlic extract has potent in vitro antibacterial activities against number of gram negative and gram positive bacteria including P. aeruginosa. The aim of this study, was to evaluate in vivo therapeutic efficacy of garlic extract in treating burn wound infection caused by P. aeruginosa in burned mouse model. Burn was induced on the back of anesthetized animals by hot water, after the hair removal. Bacterial infection was established by topical applying of highly pathogenic clinical isolate of P. aeruginosa. Potential of garlic extract on reduction of mortality was evaluated by topical application of 10% (v/v) garlic extract on burned and infected animals (treatment group 1) and was compared with two control groups: Burned and infected animals either treated with topical Silver Sulphadiazine (SSD) (1%) (treatment group 2) or left untreated (treatment group 3). The same groups were subjected to evaluate bacterial counts in organs (blood, liver, spleen and skin). Our results indicated that topical administration of garlic extract (10%) extended the survival of mice for 3-6 days, compared with survival of the untreated group. Both garlic extract and SSD treatments reduced the microbial loads in vital organs (blood, liver, spleen), compared to that of untreated control group (p< 0.05). These results demonstrate the potential of garlic extract in the treatment of burn wound infection caused by P. aeruginosa.
Liquid – vapour equilibrium calculations for MTBE/MEOH binary system by using Patel & Teja equation of state
M. Bazmi,K. Ghanbari,J. Alaei
Petroleum and Coal , 2004,
Abstract: This work presents vapour-liquid equilibrium calculations for a binary system, which is based on acomputer program. For this purpose Patel & Teja equation of state has been used for the measurementof equilibrium data, which has high efficiency for polar systems. By using this program, variousequilibrium datum such as bubble and dew point temperature/ pressure, flash calculations, andequilibrium coefficient (k value) could been calculated. The flowchart of this program and many appliedexample for MTBE/MEOH system are presented in this article and conclusions are reflected as graphsand tables.
Therapeutic Efficacy of Garlic (Allium sativa) Against Burn Wound Infection by Pseudomonas aeruginosa
M. Arzanlou,R. Arab,R. Alaei
Research Journal of Biological Sciences , 2007,
Abstract: Treatment of multi-drug resistant Pseudomonas aeruginosa, which causes burn infection is a big challenge in clinics and needs novel strategies. Garlic extract has potent in vitro antibacterial activities against number of gram negative and gram positive bacteria including P. aeruginosa. The aim of this study, was to evaluate in vivo therapeutic efficacy of garlic extract in treating burn wound infection caused by P. aeruginosa in burned mouse model. Burn was induced on the back of anesthetized animals by hot water, after the hair removal. Bacterial infection was established by topical applying of highly pathogenic clinical isolate of P. aeruginosa. Potential of garlic extract on reduction of mortality was evaluated by topical application of 10% (v/v) garlic extract on burned and infected animals (treatment group 1) and was compared with two control groups: Burned and infected animals either treated with topical Silver Sulphadiazine (SSD) (1%) (treatment group 2) or left untreated (treatment group 3). The same groups were subjected to evaluate bacterial counts in organs (blood, liver, spleen and skin). Our results indicated that topical administration of garlic extract (10%) extended the survival of mice for 3-6 days, compared with survival of the untreated group. Both garlic extract and SSD treatments reduced the microbial loads in vital organs (blood, liver, spleen), compared to that of untreated control group (p< 0.05). These results demonstrate the potential of garlic extract in the treatment of burn wound infection caused by P. aeruginosa.
Superconductivity in heavily vacant diamond
M. Alaei,S. Akbar Jafari,H. Akbarzadeh
Physics , 2008, DOI: 10.1016/j.jpcs.2008.06.103
Abstract: Using first principle electronic structure calculations we investigated the role of substitutional doping of B,N,P,Al and vacancies (${\cal V}$) in diamond (X$_{\alpha}$C$_{1-\alpha}$). In the heavy doping regime, at about $\sim 1-6%$ doping an impurity band appears in the mid gap. Increasing further the concentration of the impurity substitution fills in the gap of the diamond host. Our first principle calculation indicates that in the case of vacancies, a clear single-band picture can be employed to write down an effective {\em one band} microscopic Hamiltonian, which can be used to further study various many-body and disorder effects in impurity band (super)conductors.
An Exploration on the Effective Factors of Tourism Industry on Protection of the Environment in the Historical City Ghoumas  [PDF]
Hooman Mesgarian, Leili Alaei
Open Journal of Ecology (OJE) , 2014, DOI: 10.4236/oje.2014.49048
Abstract:

According to the world tourism organization (WHO) in 2005, the number of tourists has increased up to 36 times. In a way that it has maximized from 25 million in 1950 to 1018 million in 2010. The sustainable tourism, thus, because of making a balance between different environmental, economic, cultural and social dimensions of the tourism development, plays a considerable role in protection of species diversity, and benefits the tourism activists in order to reduce its destructive impact on the environment and the local cultures and being kept for the future generations. Accordingly, the present research first examines the relationship between tourism, sustainable development and the ecology, for measurement of different aspects of the industry effect on the environment. Secondly, the present study uses from some parameters like the average monthly minimum and maximum temperatures, the average relative humidity, the average maximum and minimum temperatures in day and at night in the Semnan station as well as using the common diagram in the experimental methods like Olegi to assess day and night Climatourism in the region. Finally, on the basis of the performed analysis, the strengths and weak points of tourist attractions for the protection of the environment are considered.


The effect of co-administration of lactobacillus probiotics and bifidobacterium on spatial memory and learning in diabetic rats
S Davari,SA Talaei,M Soltani,H Alaei
Tehran University Medical Journal , 2012,
Abstract: Background: Diabetes mellitus affects numerous intracellular metabolic processes, which are reflected by changes in the concentration of some plasma constituents. Particularly, the disease may indirectly undermine some functions of the nervous system including learning and memory through altering oxidative stress status. On the other hand, probiotics can enhance the antioxidant capacity. This study was designed to evaluate the effects of probiotics on spatial memory, maze learning and indices of oxidative stress in diabetic rats.Methods: In this experimental study, 40 male Wistar rats were randomly allocated to 4 groups (n=10 for each): Control (CO), Control probiotic (CP), Control diabetic (DC), and Diabetic probiotic (DP). The probiotic supplement, including Lactobacillus acidophilus, Lactobacillus fermentum, Bifidobacterium lactis (334 mg of each with a CFU of ~1010), was administered through drinking water every 12 hours for 8 weeks. Using morris water maze (MWM), spatial learning and memory were evaluated. Serum insulin and oxidative stress indices, including superoxide dismutase (SOD) and 8-hydroxy-2'-deoxyguanosine (8-OHdG), were measured by standard laboratory kits.Results: Oral administration of probiotics improved impairment of spatial learning (P=0.008) and consolidated memory (P=0.01) in the rats. Moreover, probiotic treatment increased serum insulin (P<0.0001) and serum superoxide dismutase activity (P=0.007) while it decreased their blood glucose (P=0.006) and 8-OHdG (P<0.0001).Conclusion: Probiotic supplementation reversed the serum concentrations of insulin and glucose along with an increase in antioxidant capacity in diabetic rats. It also improved spatial learning and memory in the animals. Relevancy of the metabolic changes and behavioral functions need to be further studied.
Etiological Profile of Short Stature in a Referral Endocrinology Clinic
MR Sharbatdar-Alaei,A Rabbani,M Rezaie,MK Nourbakhsh
Iranian Journal of Pediatrics , 2007,
Abstract: Background: Physiological growth is a sensitive long-term indicator of child health. Impaired growth of children may be the first manifestation of a serious chronic disease. Short stature is a common pediatric endocrine problem. The short stature, although not a disease per se, is a manifestation of several diseases. Its early diagnosis and treatment is most of the time rewarding. Methods: Children between the age group of 2 to 15 years with growth retardation attending endocrine clinic in Loghman Hospital, Tehran, in October 2003 through October 2005were evaluated for short stature. Evaluation included: detailed medical history, physical examination and laboratory tests such as blood count, thyroid function, growth hormone screening, bone age estimation, and karyotypes. Centers for Disease Control (CDC) growth charts was used for percentiles. Findings: 188 children (110 boys, 78 girls) with growth retardation, whose heights were below 2 standard deviation score for age and gender, attended endocrine clinic. Normal variations accounted for 85.5% of all etiologies for reasons such as constitutional delay 49% and familial short stature 26.5% and a combination of both 9%. The rest (14.5%) consisted of pathological short stature. Growth hormone deficiency and hypothyroidism were the most common causes of pathological short stature Conclusions: The most common cause of short stature was a normal variance followed by short stature caused by endocrine disturbances. In both sexes constitutional growth delay followed by familial short stature counted to the most common non-endocrine causes of short stature.
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