در هنگام جستجو کلمه در قسمت عنوان میتوانید کلمات مورد جستجو را با کاراکتر (-) جدا کنید.
کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Frontiers in Chemical Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Catechol,Hydroquinone,Chemometric,Extended ratio subtraction method,Simultaneous ratio subtraction method
- چکیده:
- چکیده انگلیسی: Two novel univariate calibration methods, namely the extended ratio subtraction method (EXRSM) and the simultaneous ratio subtraction method (SRSM) were employed for the simultaneous determination of catechol (CT) and hydroquinone (HQ) in synthetic binary mixtures. The precision, accuracy, and specificity of these methods were statistically compared to those obtained from the derivative method (as a univariate calibration method), and the principal component regression (PCR) and the partial least squares (PLS) methods (as two multivariate calibration methods). Comparison of the results showed that there was no significant difference between the proposed methods. The main advantages of the proposed methods are that, unlike the other analytical methods, it is not necessary to use expensive apparatus and chemicals, and that they can be easily performed using a simple spectrophotometer that is available in all quality control labs. The developed methods were successfully applied for the simultaneous determination of CT and HQ with different ratios in tap water as the real sample.
- انتشار مقاله: 16-08-1398
- نویسندگان: Ghadamali Bagherian,Fateme Salehi Mobarake,Mansour Arab Chamjangali,Motahare Ashrafi,Haniye Borzooei
- مشاهده
- جایگاه : پژوهشی
- مجله: Amirkabir (Journal of Science and Technology)
- نوع مقاله: Journal Article
- کلمات کلیدی:
- چکیده:
- چکیده انگلیسی:
- انتشار مقاله: 06-07-1396
- نویسندگان: ALIREZA BAGHERI SALES,ABDOLHAMID RIAZI
- مشاهده
- جایگاه : پژوهشی
- مجله: Physical Chemistry Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Thermodynamic properties,Pitzer model,Lactose,KCl,Potentiometric method
- چکیده:
- چکیده انگلیسی: In this work, the mean activity coefficients of KCl in the KCl+lactose +water system were determined using the potentiometric method. The electromotive force measurements were carried out on the galvanic cell without liquid junction of the type: Ag|AgCl|KCl (m), lactose (wt.%), H2O (1−wt.) %|K-ISE, in various mixed solvent systems containing 0, 5,7.5, 10 and 12.5 % mass fractions of lactose. The ionic strengths range was from 0.0003 to 2.000 kg.mol−1. The modeling of this ternary system was made based on the Pitzer ion-interaction model. The mean activity coefficients were correlated with Pitzer model and the adjustable Pitzer parameters (βo, β1 and Cø) were determined for the series under investigated system. Then, these parameters were used to calculate the amounts of thermodynamic properties such as osmotic coefficients and excess Gibbs free energies for under investigated systems. The results clearly indicated that a good correlation was obtained with the Pitzer model to describe this system.
- انتشار مقاله: 16-03-1396
- نویسندگان: Nazanin Zahra Norouzi,Mohammad Ali Bagherinia
- مشاهده
- جایگاه : پژوهشی
- مجله: Sahand Communications in Mathematical Analysis
- نوع مقاله: Journal Article
- کلمات کلیدی: Hilbert space,Nonexpansive mapping,Krasnoselskii-Mann iterative method,Inward condition
- چکیده:
- چکیده انگلیسی: Let $ H$ be a Hilbert space and $C$ be a closed, convex and nonempty subset of $H$. Let $T:C rightarrow H$ be a non-self and non-expansive mapping. V. Colao and G. Marino with particular choice of the sequence ${alpha_{n}}$ in Krasonselskii-Mann algorithm, ${x}_{n+1}={alpha}_{n}{x}_{n}+(1-{alpha}_{n})T({x}_{n}),$ proved both weak and strong converging results. In this paper, we generalize their algorithm and result, imposing some conditions upon the set $C$ and finite many mappings from $C$ in to $H$, to obtain a converging sequence to a common fixed point for these non-self and non-expansive mappings.
- انتشار مقاله: 15-06-1396
- نویسندگان: Ali Bagheri Vakilabad,Ali Bagheri Vakilabad,Ali Bagheri Vakilabad
- مشاهده
- جایگاه : پژوهشی
- مجله: Sahand Communications in Mathematical Analysis
- نوع مقاله: Journal Article
- کلمات کلیدی: dynamical system,Admissible vector,Covariant representation
- چکیده:
- چکیده انگلیسی: In this paper, we introduce admissible vectors of covariant representations of a dynamical system which are extensions of the usual ones, and compare them with each other. Also, we give some sufficient conditions for a vector to be admissible vector of a covariant pair of a dynamical system. In addition, we show the existence of Parseval frames for some special subspaces of $L^2(G)$ related to a uniform lattice of $G$.
- انتشار مقاله: 01-07-1396
- نویسندگان: Alireza Bagheri Salec,Seyyed Mohammad Tabatabaie,Javad Saadatmandan
- مشاهده
- جایگاه : پژوهشی
- مجله: Sahand Communications in Mathematical Analysis
- نوع مقاله: Journal Article
- کلمات کلیدی: Filter,Stone-$check{C}$ech compactification,Axiom of separation
- چکیده:
- چکیده انگلیسی: Let $X$ be an infinite set, equipped with a topology $tau$. In this paper we studied the relationship between $tau$, and ultrafilters on $X$. We can discovered, among other thing, some relations of the Robinson's compactness theorem, continuity and the separation axioms. It is important also, aspects of communication between mathematical concepts.
- انتشار مقاله: 02-08-1395
- نویسندگان: Alireza Bagheri Salec,Alireza Bagheri Salec,Alireza Bagheri Salec
- مشاهده
- جایگاه : پژوهشی
- مجله: Nursing and Midwifery Studies
- نوع مقاله: Journal Article
- کلمات کلیدی: nursing,Sleep,Coronary Care Unit
- چکیده:
- چکیده انگلیسی: Background Patients in coronary care unit are at risk of sleep deprivation. Sleep deprivation can be associated with increased blood pressure and heart rate, raising the risk of developing cardiovascular problems among patients hospitalized in coronary care unit. Objectives This study was carried out to examine the effect of eye mask on sleep quality in cardiac patients. Patients and Methods In this randomized controlled trial, 60 patients who met the inclusion criteria were selected using a convenient sampling method and randomly allocated into the experimental and control groups. Patients in the control group received routine care. However, in the experimental group, patients received routine care and eye mask for three subsequent nights. In the both groups, the sleep quality was assessed using the Pittsburgh sleep quality index. Data were analyzed by the chi-square test, independent samples t-test, Mann-Whitney U, and Wilcoxon signed-rank tests. Results After the study, the median scores of the subjective sleep quality, the sleep latency, the sleep duration, the habitual sleep efficiency, and the sleep disturbances domains, as well as the median score of overall Pittsburgh sleep quality index in the experimental group were significantly lower than those in the control group (P < 0.05). However, no significant differences were observed between the two groups in terms of the use of sleep medications and the daytime dysfunction domains (P > 0.05). Conclusions Using eye mask can significantly improve the sleep quality in cardiac patients. Therefore, nurses are recommended to use eye mask in combination with current treatments for improving patients’ sleep quality.
- انتشار مقاله: 11-10-1348
- نویسندگان: Atye Babaii,Atye Babaii,Mohsen Adib-Hajbaghery,Ali Hajibagheri
- مشاهده
- جایگاه : پژوهشی
- مجله: Nursing and Midwifery Studies
- نوع مقاله: Journal Article
- کلمات کلیدی: massage,hemodialysis,Lavender Oil,Restless Leg Syndrome
- چکیده:
- چکیده انگلیسی: Background Restless leg syndrome (RLS) is a common problem in patients with chronic renal failure. It can reduce the quality of life and sleep disturbances. This disorder is usually treated pharmacologically. Recently, complementary medicine methods have been suggested because of chemical drugs adverse effects. There is not enough evidence about the effect of aromatherapy on RLS. Objectives The aim of this study was to determine the effects of massage with lavender oil on RLS symptoms in hemodialysis patients. Patients and Methods This randomized clinical trial study included 70 hemodialysis patients with RLS that were randomly assigned into two groups in 2014. The experimental group received effleurage massage using lavender oil and control group received routine care for three weeks. Data was collected with RLS questionnaire and analyzed using independent and paired t-test and Chi-square test. Results The mean RLS scores were not significantly different in the two groups at the start of study (22.41 ± 7.67 vs. 22.90 ± 4.38, P = 0.76). At the end of study, the mean RLS score significantly decreased in the intervention group, while this score remained relatively un-changed in the control group (12.41 ± 5.49 vs. 23.23 ± 4.52, P < 0.0001). Conclusions Lavender oil massage was effective to improve RLS in hemodialysis patients. It has no adverse effects, is practical and cost-effective. It is suggested to be used along with routine treatment of RLS in hemodialysis patients.
- انتشار مقاله: 11-10-1348
- نویسندگان: Sayyed Hossein Hashemi,Ali Hajbagheri,Mohammad Aghajani
- مشاهده
- جایگاه : پژوهشی
- مجله: Nursing and Midwifery Studies
- نوع مقاله: Journal Article
- کلمات کلیدی: Students,nursing,Thinking,Mental Competency
- چکیده:
- چکیده انگلیسی: Background Critical thinking is one of the most important concepts in the field of education. Despite studies published on nursing students’ critical thinking skills (CTS), some suggest that there is not enough evidence supporting the relationship between content of nursing education programs and nursing students’ CTS. Objectives Given the existing discrepancies, this study aimed to compare the critical thinking skills of freshmen and senior nursing students. Patients and Methods This comparative study was conducted on 150 undergraduate freshmen and senior nursing students in Kashan University of Medical Sciences, during 2012. The students in the first and the last semesters of their study in nursing were entered in the study using the census method. Data were collected using a questionnaire including questions on demographic data and the California Critical Thinking Skills Test, form B. Data analysis was performed using the SPSS v.13 software. Descriptive statistics were calculated. Moreover, independent sample t-test and Spearman and Pearson’s correlation coefficients were used in the data analysis. Results Both the freshmen and senior nursing students had low CTS. The mean critical thinking scores were 11.79 ± 4.80 and 11.21 ± 3.17 for the freshmen and the senior students, respectively (P = 0.511). Moreover, no significant correlation was found between the students’ score in CTS and their age, gender, high school grade point average (GPA), rank in university entrance examination (RUEE) and interest in the nursing profession. Conclusions The students were low skilled in critical thinking and their CTS did not significantly change during their nursing degree. Thus it may be concluded that the nursing education program did not affect the CTS of its students. Longitudinal studies are suggested for assessing nursing students’ critical thinking over time. Moreover, revising the curriculum and preparing nursing educators for implementing innovative and active teaching strategies are suggested.
- انتشار مقاله: 11-10-1348
- نویسندگان: Ismail Azizi-Fini,Ali Hajibagheri,Mohsen Adib-Hajbaghery
- مشاهده
- جایگاه : پژوهشی
- مجله: Nursing and Midwifery Studies
- نوع مقاله: Journal Article
- کلمات کلیدی: Nursing care,Respiration,Mouth,Artificial
- چکیده:
- چکیده انگلیسی: Context Studies show that despite the role of mouth care in preventing ventilator-associated pneumonia, there is no high quality evidences for it. This study reviewed the literature related to mouth care in patients receiving mechanical ventilation. Evidence Acquisition PubMed, Ovide, Elsevier, ProQuest, IranMedex, SID, and Magiran databases were searched using key terms such as oral care, mouth care, critical care, and intensive care. Fifty-seven full-text articles in total were retrieved and included in the study. Results Totally, 15 review articles and 42 research articles were reviewed. Only 13 articles introduced or evaluated the validity of instruments or caring guidelines in the area of mouth care. Only one study discussed about designing and validating the psychometric properties of a mouth assessment scale. Most of the articles emphasized on brushing the teeth as the best method for mouth care, but there was no consensus on the frequency of washing and the best washing solution. Conclusions Despite the importance of mouth care, few original studies are conducted in this area and there is no approved clinical guideline for this procedure.
- انتشار مقاله: 11-10-1348
- نویسندگان: Ali Hajibagheri,Ismail Azizi Fini
- مشاهده