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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: International Journal of Industrial Electronics Control and Optimization
- نوع مقاله: Journal Article
- کلمات کلیدی: Quadrature delta sigma modulator,WLAN/WCDMA/GSM,Multi standard,Low-IF receiver
- چکیده:
- چکیده انگلیسی: A reconfigurable third-order multi-bit continuous-time quadrature delta-sigma modulator (CT-QDSM) with mismatch error correction is reported in this paper. This modulator is designed for a tri-mode WLAN/WCDMA/GSM Low-IF (Intermediate Frequency) receiver. A three-bit quantizer is utilized to achieve the bandwidth (BW) and signal to noise ratio (SNR) required in WLAN/WCDMA standards. In this modulator, the adders are eliminated to optimize the power consumption. The excess loop delay of modulator compensated by half of the sampling period of quantizer. The reconfigurable dynamic element matching (DEM) is proposed to eliminate the mismatch error. Therefore, the I and Q mismatch error are alleviated by designing the data weighted average (DWA) and homogeneous block (HB) circuits for WCDMA/WLAN modes respectively. In addition, the complex_digital to analog converter (C_DAC) is designed to eliminate the mismatch between I and Q paths. Implemented in 180 nm CMOS, achieves 53.6/74.2/81.63 dB SNR and figure-of-merits (FoM) of 0.863/0.495/1.63 pJ/ (conversion step) with a 20/2/0.2 MHz BW for WLAN/WCDMA/GSM operational mode.
- انتشار مقاله: 25-10-1397
- نویسندگان: Alireza Shamsi,Alireza Shamsi,Alireza Shamsi
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Industrial Electronics Control and Optimization
- نوع مقاله: Journal Article
- کلمات کلیدی: Sustainable energy,Wind Turbine,Switched reluctance generators,control of firing angles,and Particle swarm optimization
- چکیده:
- چکیده انگلیسی: Fossil fuel combustion in power plants is the world’s most significant threat to people’s health and the environment. Recently, wind power, as a clean, sustainable and renewable source of energy, has attracted many researchers. The present paper studies how to maximize the extraction of wind power and the efficiency of a switched reluctance generator (SRG) by firing angles control. The proposed scenario comprises the optimization of turn-on and turn-off angles in the offline mode using a particle swarm optimization algorithm to control the system in the online mode with linear interpolation. The present approach simultaneously investigates the firing angles; also, it has simple structure, low execution time, and efficient convergence rate that are independent of machine characteristics (regardless of high nonlinearity of SRG). Furthermore, copper losses, as well as switching and conduction losses of semiconductors, were considered in simulations to achieve a more realistic outcome. Ultimately, the simulation results of a typical three-phase 6/4 generator using Matlab confirmed the validity of the presented control strategy that can easily find applications in the future.
- انتشار مقاله: 29-09-1398
- نویسندگان: Hojjat Hajiabadi,Mohsen Farshad,MohammadAli Shamsinejad
- مشاهده
- جایگاه : پژوهشی
- مجله: Energy Equipment and Systems
- نوع مقاله: Journal Article
- کلمات کلیدی: environment,Pollutants,Energy Efficiency,Energy Audit
- چکیده:
- چکیده انگلیسی: Decisions can be taken to increase energy efficiency and to mitigate the emissions to the environment by examining the energy audit and greenhouse gas (GHG) emissions footprint of crop production in different ways and in different regions, with comparable principles. In this study, energy consumption and energy indices of tomatoes production in four regions of Iran including East Azerbaijan province (open field), the provinces of Kermanshah, Tehran and Isfahan (greenhouse) were compared using related articles data. Chemical fertilizers and irrigation water in tomato production in open field and diesel fuel and chemical fertilizers in the tomato production in greenhouses system was greatest energy consumer in Iran. Energy consumption of irrigation water for tomato production in open field was markedly higher than the production in the greenhouse. In this study, the inputs of diesel fuel, chemical fertilizers, chemicals, plastics, and electricity used in the production of tomatoes, which contribute to the GHG emission footprint, were calculated via coefficients related to GHG emission. The highest and lowest greenhouse gas emissions in greenhouse tomato production in Tehran province and East Azerbaijan province farms were determined to be 13661.37 kgCO2eq ha-1 and 1274.02 kgCO2eq ha-1, respectively. Overall, tomato production in open field leads to lower greenhouse gas emissions and energy consumption per unit area, but according to more energy output in cultivation of tomato in greenhouse, energy efficiency of tomato production in greenhouse was higher.
- انتشار مقاله: 02-10-1395
- نویسندگان: Hosseinali Shamsabadi,Mohammad Abedi,Desa Ahmad,Alireza Taheri-Rad
- مشاهده
- جایگاه : پژوهشی
- مجله: Avicenna Journal of Phytomedicine
- نوع مقاله: Journal Article
- کلمات کلیدی: ginger,Serum,TGF-β,Experimental autoimmune encephalomyelitis,IL-12
- چکیده:
- چکیده انگلیسی:
Objective: The main function of IL-12 is differentiation of naive T cells intoTh1 cells and TGF-β is a powerful immunoregulatory cytokine. The immunomodulatory and anti-inflammatory properties of ginger have also been reported in some studies. The aim of this study was to evaluate the effects of ginger extract on the expression of IL-12 and TGF-β in a model of experimental autoimmune encephalomyelitis (EAE).
Materials and Methods: EAE was induced in C57BL/6 mice by immunization with myelin oligodendroglial glycoprotein emulsified in complete Freund's adjuvant. The mice were administered intra-peritoneally with ginger extracts or PBS, from day +3 to +30. On day 31, mice were scarified and the expression of IL-12 and TGF-β mRNA in the spinal cord were determined by using real time-PCR. The serum levels of cytokines were measured by ELISA.
Results: In PBS-treated EAE mice, the expression of IL-12 P35 and IL-12 P40 mRNA in the CNS and the mean serum levels of IL-12 were significantly higher than those of healthy group (p<0.001). In ginger-treated EAE mice, the expression of IL-12 mRNA and its serum levels were significantly lower as compared to PBS-treated EAE mice. No significant difference was observed between PBS-treated EAE mice and healthy group regarding the expression of TGF-β mRNA. In ginger (300 mg/kg)-treated EAE group, the expression of TGF-β mRNA and its serum levels were significantly higher in comparison to PBS-treated EAE mice (p
Conclusion: These results indicated that ginger extract modulates the expression of IL-12 and TGF-β in CNS and serum of EAE mice.- انتشار مقاله: 08-02-1394
- نویسندگان: Abdollah Jafarzadeh,Rayhane Ahangar-Parvin,Maryam Nemati,Zahra Taghipour,Ali Shamsizadeh,Fatemeh Ayoobi,Zuhair Mohammad Hassan
- مشاهده
- جایگاه : پژوهشی
- مجله: Avicenna Journal of Phytomedicine
- نوع مقاله: Journal Article
- کلمات کلیدی: Seizure,Plant extracts,Zataria multiflora Boiss,Pentylenetetrazole
- چکیده:
- چکیده انگلیسی:
Objective: At present, there are many antiepileptic drugs with a wide range of side effects on the human body. It was assumed that Zataria multiflora Boiss (Z. multiflora) with sedative, anti-spasmodic and anti-inflammatory activity may be effective in the treatment of epilepsy. The aim of the present study was to elucidate the effect of Z. multiflora hydroalcoholic extract and its fraction extracts on pentylenetetrazole (PTZ)-induced chemical kindling.
Materials and Methods: In this experimental study, eight separate groups of male albino mice were used. All groups received 11 separate intraperitoneal injections of PTZ (35 mg/kg) with two-day intervals. 30 min before the injection of PTZ, mice received vehicle, Z. multiflora hydroalcoholic extract (300 and 600 mg/kg), n-hexane, acetone, methanol fraction extracts (150 mg/kg), or diazepam (10 mg/kg).
Results: The kindled mice that were pretreated with vehicle showed a gradual increase in their seizure scores up to the end of the study. The hydroalcoholic extract of Z. multiflora (300 and 600 mg/kg) reduced seizure scores significantly. However, n-hexane, acetone and methanol extracts did not affect seizure scores significantly.
Conclusion: The present findings demonstrate that the hydroalcoholic extract of Z. multiflora did reduce the severity of seizure attacks in PTZ-induced chemical kindling in mice.- انتشار مقاله: 06-05-1394
- نویسندگان: Ali Shamsizadeh,Farangis Fatehi,Fatemeh Arab Baniasad,Fatemeh Ayoobi,Mohammad Ebrahim Rezvani,Ali Roohbakhsh
- مشاهده
- جایگاه : پژوهشی
- مجله: Asian Pacific Journal of Cancer Prevention
- نوع مقاله: Journal Article
- کلمات کلیدی: NAT2,bladder cancer,Lebanese
- چکیده:
- چکیده انگلیسی:
Background: In Lebanon, bladder cancer (BC) has an unusually high prevalence. Individuals who are exposed to aromatic amines from smoking or certain occupations and carrying the slow N-acetyl transferase 2 (NAT2) acetylator’ phenotype may be at a higher risk. Methods: Data and DNA from 115 Lebanese BC cases and 306 controls were examined. Ten NAT2 single nucleotide polymorphisms were genotyped, seven of which were then included in haplotype and phenotype analysis. Results: BC patients were more likely to be males (87.8% vs. 54.9%) and current smokers (60.9% vs. 26.5%) when compared to controls. In both groups, most participants had the slow NAT2 acetylator phenotype (66.1% of BC cases vs 62.7% of controls; P=0.302) with the NAT2*5B and *6A haplotypes being the most common. The odds ratio (95%CI) of having BC among slow NAT2 acetylators was 1.157 (0.738-1.815) and remained non-significant after adjustment [1.097 (0.666-1.806)]. Sensitivity analysis with a subgroup of 113 cases and 84 controls for which occupational history was available revealed a statistically significant association between slow NAT2 acetylators and BC in females only. The sample size was however very small and the CI quite wide. Conclusions: This is the first study to evaluate the distribution of NAT2 haplotypes and their potential role in BC in a Lebanese population. The absence of any significant association may be due to the relatively small sample size, the unavailability of matching by gender, and the lack of evaluation of genetic interactions with extent of active and passive smoking, exposure to environmental pollutants, diet, and other genes. The potential association limited to females needs further evaluation.- انتشار مقاله: 26-04-1396
- نویسندگان: Rami Nasr,Sally Temraz,Deborah Mukherji,Ali Shamseddine,Reem Akika,Sehrish Abbasi,Raja Khauli,Muhammad Bulbul,Hani Tamim,Nathalie K Zgheib
- مشاهده
- جایگاه : پژوهشی
- مجله: Asian Pacific Journal of Cancer Prevention
- نوع مقاله: Journal Article
- کلمات کلیدی: NAT2,bladder cancer,Lebanese
- چکیده:
- چکیده انگلیسی:
Background: In Lebanon, bladder cancer (BC) has an unusually high prevalence. Individuals who are exposed to aromatic amines from smoking or certain occupations and carrying the slow N-acetyl transferase 2 (NAT2) acetylator’ phenotype may be at a higher risk. Methods: Data and DNA from 115 Lebanese BC cases and 306 controls were examined. Ten NAT2 single nucleotide polymorphisms were genotyped, seven of which were then included in haplotype and phenotype analysis. Results: BC patients were more likely to be males (87.8% vs. 54.9%) and current smokers (60.9% vs. 26.5%) when compared to controls. In both groups, most participants had the slow NAT2 acetylator phenotype (66.1% of BC cases vs 62.7% of controls; P=0.302) with the NAT2*5B and *6A haplotypes being the most common. The odds ratio (95%CI) of having BC among slow NAT2 acetylators was 1.157 (0.738-1.815) and remained non-significant after adjustment [1.097 (0.666-1.806)]. Sensitivity analysis with a subgroup of 113 cases and 84 controls for which occupational history was available revealed a statistically significant association between slow NAT2 acetylators and BC in females only. The sample size was however very small and the CI quite wide. Conclusions: This is the first study to evaluate the distribution of NAT2 haplotypes and their potential role in BC in a Lebanese population. The absence of any significant association may be due to the relatively small sample size, the unavailability of matching by gender, and the lack of evaluation of genetic interactions with extent of active and passive smoking, exposure to environmental pollutants, diet, and other genes. The potential association limited to females needs further evaluation.- انتشار مقاله: 26-04-1396
- نویسندگان: Rami Nasr,Sally Temraz,Deborah Mukherji,Ali Shamseddine,Reem Akika,Sehrish Abbasi,Raja Khauli,Muhammad Bulbul,Hani Tamim,Nathalie K Zgheib
- مشاهده
- جایگاه : پژوهشی
- مجله: Asian Pacific Journal of Cancer Prevention
- نوع مقاله: Journal Article
- کلمات کلیدی: NAT2,bladder cancer,Lebanese
- چکیده:
- چکیده انگلیسی:
Background: In Lebanon, bladder cancer (BC) has an unusually high prevalence. Individuals who are exposed to aromatic amines from smoking or certain occupations and carrying the slow N-acetyl transferase 2 (NAT2) acetylator’ phenotype may be at a higher risk. Methods: Data and DNA from 115 Lebanese BC cases and 306 controls were examined. Ten NAT2 single nucleotide polymorphisms were genotyped, seven of which were then included in haplotype and phenotype analysis. Results: BC patients were more likely to be males (87.8% vs. 54.9%) and current smokers (60.9% vs. 26.5%) when compared to controls. In both groups, most participants had the slow NAT2 acetylator phenotype (66.1% of BC cases vs 62.7% of controls; P=0.302) with the NAT2*5B and *6A haplotypes being the most common. The odds ratio (95%CI) of having BC among slow NAT2 acetylators was 1.157 (0.738-1.815) and remained non-significant after adjustment [1.097 (0.666-1.806)]. Sensitivity analysis with a subgroup of 113 cases and 84 controls for which occupational history was available revealed a statistically significant association between slow NAT2 acetylators and BC in females only. The sample size was however very small and the CI quite wide. Conclusions: This is the first study to evaluate the distribution of NAT2 haplotypes and their potential role in BC in a Lebanese population. The absence of any significant association may be due to the relatively small sample size, the unavailability of matching by gender, and the lack of evaluation of genetic interactions with extent of active and passive smoking, exposure to environmental pollutants, diet, and other genes. The potential association limited to females needs further evaluation.- انتشار مقاله: 26-04-1396
- نویسندگان: Rami Nasr,Sally Temraz,Deborah Mukherji,Ali Shamseddine,Reem Akika,Sehrish Abbasi,Raja Khauli,Muhammad Bulbul,Hani Tamim,Nathalie K Zgheib
- مشاهده
- جایگاه : پژوهشی
- مجله: Applied Research on English Language
- نوع مقاله: Journal Article
- کلمات کلیدی: L2 writing,narrative intelligence,depth and breadth of vocabulary,Grammar,verbal intelligence,Discriminant function analysis
- چکیده:
- چکیده انگلیسی: The major aim of this paper was to investigate the validity of language and
intelligence factors for classifying Iranian English learners` writing performance.
Iranian participants of the study took three tests for grammar, breadth, and depth of
vocabulary, and two tests for verbal and narrative intelligence. They also produced a
corpus of argumentative writings in answer to IELTS specimen. Several runs of
discriminant function analyses were used to examine the classifying power of the five
variables for discriminating between low and high ability L2 writers. The results
revealed that among language factors, depth of vocabulary (collocational knowledge)
produces the best discriminant function. In general, narrative intelligence was found
to be the most reliable predictor for membership in low or high groups. It was also
found that, among the five sub-abilities of narrative intelligence, emplotment carries
the highest classifying value. Finally, the applications and implications of the results
for second language researchers, cognitive scientists, and applied linguists were
discussed.- انتشار مقاله: 02-10-1391
- نویسندگان: Reza Pishghadam,Mohammad Ali Shams
- مشاهده
- جایگاه : پژوهشی
- مجله: Advanced Journal of Chemistry-Section A
- نوع مقاله: Journal Article
- کلمات کلیدی: Thioridazine,Graphene quantum dot,Electrochemical sensor,Drug analysis,NiO nanoparticles
- چکیده:
- چکیده انگلیسی: In this work, thioridazine (TR) as an important neuroleptic drug has been detected simply by an electrochemical approach using a glassy carbon electrode modified by nickel oxide nanoparticles decorated graphene quantum dot (NiO/GQD/GCE). The bare and modified electrodes were characterized using the scanning electron microscope (SEM) and electrochemical techniques. The cyclic voltammetric studies demonstrated that the NiO/GQD/GCE has remarkably enhanced electro-catalytic activity towards the oxidation of TR in neutral solutions. The results (significant increase in peak current and a negative shift in TR oxidation potential) are related to the increase in electrode surface area and electron transfer rate along with the modifier catalytic role. The NiO/GQD modified electrode used for sensitive determination of TR by differential pulse voltammetry (DPV) method. The effect of experimental parameters on the obtained results was studied and optimized. The NiO/GQD/GCE modified electrode revealed a linear response in the concentration range from 2×10-9 to 200×10-9 M with a limit of detection (LOD) equal to 0.05×10-9 M (S/N=3). The sensor was applied to determine TR in serum and pharmaceutical samples, which proves this sensor is an ideal device for TR determination.
- انتشار مقاله: 18-07-1399
- نویسندگان: Ali Shamsi,Fatemeh Ahour
- مشاهده