New formulation of vitamin C encapsulation by nanoliposomes: production and evaluation of particle size, stability and control release

Samaneh Amiri,Mahmoud Rezazadeh-Bari,Mohammad Alizadeh-Khaledabad,Saber Amiri 한국식품과학회 2019 Food Science and Biotechnology Vol.28 No.2

In the present study, the effects of differentratios of milk phospholipids, cholesterol and phytosterols(Campesterol) powder (50–100%, 0–50%, and 0–50%,respectively) and sonication time (20, 25, 30, 35 and40 min) were investigated to produce a new formulation ofnanoliposomes for encapsulation of vitamin C. The resultsshowed that increasing the time of sonication anddecreasing the ratio of phospholipid to phytosterol significantlydecreased nanoliposomes’ particle size (p\0.05). The maximum encapsulation efficiency was obtained at 35and 40 min of sonication time and 75–25 ratio of phospholipid:phytosterol. Also, reducing the sonication time inthe same ratio of phospholipid/phytosterol caused toincrease the controlled release. The highest stability ofvitamin C during 20 days was obtained in the ratio of75–25 (phospholipids: campesterol). The results showed apositive effect of cholesterol replacement with campesterolon encapsulation efficiency, control release and stability ofvitamin C in nanoliposomes.

DISTANCE BETWEEN CONTINUOUS FRAMES IN HILBERT SPACE

Amiri, Zahra,Kamyabi-Gol, Rajab Ali Korean Mathematical Society 2017 대한수학회지 Vol.54 No.1

In this paper, we study some equivalence relations between continuous frames in a Hilbert space ${\mathcal{H}}$. In particular, we seek two necessary and sufficient conditions under which two continuous frames are near. Moreover, we investigate a distance between continuous frames in order to acquire the closest and nearest tight continuous frame to a given continuous frame. Finally, we implement these results for shearlet and wavelet frames in two examples.

Understanding the Dynamics between U.S. City Diplomacy and Public Diplomacy

Amiri, Sohaela The Korean Association for Public Diplomacy 2022 Journal of public diplomacy Vol.2 No.1

What is the relationship between city diplomacy and public diplomacy in the United States? Whilst this question is often raised among scholars and practitioners of public diplomacy, a concrete and systematic response to it seems difficult to locate. This paper addresses the question by relying on earlier research based on empirical analysis of data from semi-structured interviews with city officials with international purview in the United States as well as with current and former officials at the U.S. Department of State who have worked on topics related to city diplomacy. The research and analysis that informs this paper and the diagrams it offers are hinged on design principles and adopt an architecture studio style approach to data analysis. Further, multidimensional scaling and correspondence analysis are used to visualize the convergence and divergence between the functions of public diplomacy, as introduced by Nicholas Cull, and the functions of city diplomacy that this paper introduces. This is done to first, provide a framework for understanding the dynamics between city diplomacy and public diplomacy; and second, uncover the policy intervention space that could guide policies for making U.S. city diplomacy and public diplomacy more strategically aligned.

Effects of Sequential Trinexapac-Ethyl Applications and Traffic on Growth of Perennial Ryegrass (Lolium perenne L.)

Amiri-Khah, Rahim,Eetemadi, Nematollah,Nikbakht, Ali,Pessarakli, Mohammad Korean Society of Horticultural Science 2015 원예과학기술지 Vol.33 No.3

Mowing turfgrasses, especially fast growing species like perennial ryegrass, is one of the most time and money consuming tasks of their management. Trinexapac-ethyl (TE) is a popular plant growth regulator used to reduce mowing requirements, improve stress tolerance, and enhance turf quality. This study was conducted to investigate the effect of TE rate and frequency of applications on growth response and traffic tolerance of perennial ryegrass. The experiment was a split-plot laid out in a randomized complete block (RCB) design with three replications. TE was applied to main plots at 0.00, 0.25, and $0.50kg\;a.i.\;ha^{-1}$. Application pattern included an initial application, followed by two sequential applications at 6-wk intervals. Traffic treatment was applied to subplots with a cleated roller. Results demonstrated that TE consistently reduced vertical shoot growth, clippings dry weight, with maximum growth reduction of 59% and 65%, for 0.25 and $0.50kg\;a.i.\;ha^{-1}$, respectively, occurring at 2 weeks after initial TE treatment (WAT). Traffic also dramatically reduced vertical shoot growth and clippings dry weight. Overall, quality of perennial ryegrass was enhanced by sequential TE applications, however, turf quality and surface coverage reduced greatly under traffic, regardless of TE treatment. Total chlorophyll, chlorophyll a and chlorophyll b and total carbohydrates (TC) contents were also positively influenced following sequential TE application. Our results indicated that TE reduces mowing frequency and enhances turf quality rather than influencing traffic resistance.

New method for generation of artificial ground motion by a nonstationary Kanai-Tajimi model and wavelet transform

Amiri, G. Ghodrati,Bagheri, A.,Fadavi, M. Techno-Press 2007 Structural Engineering and Mechanics, An Int'l Jou Vol.26 No.6

Considering the vast usage of time-history dynamic analyses to calculate structural responses and lack of sufficient and suitable earthquake records, generation of artificial accelerograms is very necessary. The main target of this paper is to present a novel method based on nonstationary Kanai-Tajimi model and wavelet transform to generate more artificial earthquake records, which are compatible with target spectrum. In this regard, the generalized nonstationary Kanai-Tajimi model to include the nonstationary evaluation of amplitude and dominant frequency of ground motion and properties of wavelet transform is used to generate ground acceleration time history. Application of the method for El Centro 1940 earthquake and two Iranian earthquakes (Tabas 1978 and Manjil 1990) is presented. It is shown that the model and identification algorithms are able to accurately capture the nonstationary features of these earthquake accelerograms. The statistical characteristics of the spectral response of the generated accelerograms are compared with those for the actual records to demonstrate the effectiveness of the method. Also, for comparison of the presented method with other methods, the response spectra of the synthetic accelerograms compared with the models of Fan and Ahmadi (1990) and Rofooei et al. (2001) and it is shown that the response spectra of the synthetic accelerograms with the method of this paper are close to those of actual earthquakes.

Direct Microwave Sintering of Poorly Coupled Ceramics in Electrochemical Devices

Amiri, Taghi,Etsell, Thomas H.,Sarkar, Partha The Korean Electrochemical Society 2022 Journal of electrochemical science and technology Vol.13 No.3

The use of microwaves as the energy source for synthesis and sintering of ceramics offers substantial advantages compared to conventional gas-fired and electric resistance furnaces. Benefits include much shorter processing times and reaching the sintering temperature more quickly, resulting in superior final product quality. Most oxide ceramics poorly interact with microwave irradiation at low temperatures; thus, a more complex setup including a susceptor is needed, which makes the whole process very complicated. This investigation pursued a new approach, which enabled us to use microwave irradiation directly in poorly coupled oxides. In many solid-state electrochemical devices, the support is either metal or can be reduced to metal. Metal powders in the support can act as an internal susceptor and heat the entire cell. Then sufficient interaction of microwave irradiation and ceramic material can occur as the sample temperature increases. This microwave heating and exothermic reaction of oxidation of the support can sinter the ceramic very efficiently without any external susceptor. In this study, yttria stabilized zirconia (YSZ) and a Ni-YSZ cermet support were used as an example. The cermet was used as the support, and a YSZ electrolyte was coated and sintered directly using microwave irradiation without the use of any susceptor. The results were compared to a similar cell prepared using a conventional electric furnace. The leakage test and full cell power measurement results revealed a fully leak-free electrolyte. Scanning electron microscopy and density measurements show that microwave sintered samples have lower open porosity in the electrode support than conventional heat treatment. This technique offers an efficient way to directly use microwave irradiation to sinter thin film ceramics without a susceptor.

The Impact of Feudalism and Racialism on The Construction of Self- and Gender Identities in Mohamed S. Mohamed’s Kiu and Nyota ya Rehema

Amiri Swaleh 한국외국어대학교 아프리카연구소 2020 Asian Journal of African Studies Vol.- No.47

This paper analyses and evaluates the impact of feudalism and racialism on the mapping and construction of self- and gender identities in Mohamed S. Mohamed’s two novels: Kiu (1972) and Nyota ya Rehema (1976). The study will use a composite approach comprising New Historicism, Gender Criticism and Stylistics. New Historicism helped to situate and map the works analyzed in relation to particular Zanzibari epochs. Gender Criticism was expended in interrogating how women and men in feudal Zanzibari society related with each other at all levels of social interaction and the impact on their self- and gender identities. Finally, stylistics was used to interrogate and evaluate the dominant structural and stylistic features of the choice texts and their impact on the study topic.The study will be guided by two hypotheses, viz, that in feudal Zanzibari society, racialism and the dominant ideologies (patriarchy, feudalism and racialism), impacted negatively on the self- and gender identities of both female and male members of Zanzibari society. Secondly, this study contends that, the stylistic devices used in each one of the choice texts, were important in delineating the mapping and construction of self- and gender identities..

Sleep Duration, Sleep Quality, and Insomnia in Association With Self-Rated Health: A Systematic Review and Meta-Analysis

Amiri Sohrab 대한수면학회 2023 sleep medicine research Vol.14 No.2

Background and Objective This study undertook a systematic review and meta-analysis of the relationship between sleep duration, sleep quality, and insomnia in association with self-rated health.Methods Studies that had examined the relationship between sleep duration, sleep quality, and insomnia with self-rated health were eligible. PubMed and Scopus were the two main databases for searching for studies related to this meta-analysis. The Google Scholar database as a source of gray literature was also searched by hand. This search was from the beginning of the formation of databases until the end of January 2022, and the search language was limited to articles published in English. The Effective Public Health Practice Project Quality Assessment Tool was used to assess the quality of studies. For this meta-analysis, odds ratio and 95% confidence interval were extracted or calculated. The pool of studies was processed by the random effects method.Results Twenty-six studies were included in this meta-analysis. Sleep duration of ≤ 8 hours per day (h/d) (odds ratio = 1.58 and 95% confidence interval = [1.41–1.77]) and sleep duration of > 8 h/d (odds ratio = 1.32 and 95% confidence interval = [1.17–1.50]) are associated with poor self-rated health. Poor sleep quality and insomnia are associated with poor self-rated health. Conclusions Sleep problems have a negative effect on self-rated health, and therefore, effective interventions can help improve sleep.

Relationship Between Assertion and Aggression with Addiction Potential: A Cross-Sectional Study in 2019

Amiri Mohammad,Sadeghi Zakieh,Sadeghi Elham,Khosravi Ahmad 질병관리본부 2020 Osong Public Health and Research Persptectives Vol.11 No.4

Objectives This study aimed to determine the relationship between assertion and aggression with addiction potential among students in Shahroud University of Medical Sciences. Methods In this cross-sectional study conducted in 2019, 500 students of Shahroud University of Medical Sciences, were selected by multistage random sampling, for a study using the Addiction Potential Scale, and Assertion and Aggression Questionnaires. Data were analyzed using ANOVA, Chi-square, t test, Pearson’s correlation coefficient, and the linear regression model. Results The mean scores of addiction potential, aggression, and assertion were 32.7 ± 17.2, 41.5 ± 12.9 and 139.4 ± 22.3, respectively. In this study, 38.8% (N = 194) of students had high aggression and 76.8% (N = 384) had high assertion. In the regression model, aggression, history of drug and addictive substances abuse, history of tobacco use, and history of alcohol abuse were significantly related to addiction potential (p ≤ 0.05). There was a negative relationship between assertion and addiction potential so that with one-unit increase in the assertion score, the addiction potential score decreased by −0.11. Conclusion Given the direct relationship between aggression and addiction potential, and since more than three-quarters of the students had moderate to high aggression, it is necessary to pay more attention to this issue. Interventions may play an important role in improving the current situation.

Simulation of earthquake records using combination of wavelet analysis and non-stationary Kanai-Tajimi model

Amiri, G. Ghodrati,Bagheri, A. Techno-Press 2009 Structural Engineering and Mechanics, An Int'l Jou Vol.33 No.2

This paper is aimed at combining wavelet multiresolution analysis and nonstationary Kanai-Tajimi model for the simulation of earthquake accelerograms. The proposed approach decomposes earthquake accelerograms using wavelet multiresolution analysis for the simulation of earthquake accelerograms. This study is on the basis of some Iranian earthquake records, namely Naghan 1977, Tabas 1978, Manjil 1990 and Bam 2003. The obtained results indicate that the simulated records preserve the significant properties of the actual accelerograms. In order to investigate the efficiency of the model, the spectral response curves obtained from the simulated accelerograms have been compared with those from the actual records. The results revealed that there is a good agreement between the response spectra of simulated and actual records.