http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Taher, Mohammad Ali,Mostafavi, Ali,Afzali, Darush,Rezaeipour, Ebrahim Korean Chemical Society 2004 Bulletin of the Korean Chemical Society Vol.25 No.8
This work assesses the potential of natural Analcime Zeolite as an adsorbent for preconcentration of lead (II) traces. Lead is quantitatively retained on 2-(5-bromo-2-pyridylazo)-5-diethylaminophenol by column method with Analcime in the pH range of 5-6.5 and 2 mL $min^{?1}$ flow rate. Lead was removed from the column with 10.0 mL of 4 M hydrochloric acid and was determined by anodic stripping differential pulse voltammetry. 0.5ppb detection limit was obtained and linear dynamic range was 3 to $1.2{\times}10^5$ ppb in final solution with correlation coefficient of 0.999 and relative standard deviation of ${\pm}$ 1.2% (for eight replicate determination of 2.5 ${\mu}g\;mL^{?1}$ of lead). Various parameters such as the effect of pH, flow rate, instrumental conditions and interferences of some ions on the determination of lead have been studied in detail for optimization of conditions. The method was successfully applied for determination of lead in various samples.
Taher, Mohammad Ali Korean Chemical Society 2003 Bulletin of the Korean Chemical Society Vol.24 No.8
Thallium is quantitatively retained by 1,10-phenanthroline and tetraphenylborate onto benzophenone in the pH range 0-11 from a large volumes of aqueous solutions of various samples. After filtration, the solid mass consisting of thallium complex and benzophenone is dissolved with 5 mL of dimethylformamide and the metal was determined by flame atomic absorption spectrometric. About 0.4 ㎍ of thallium can be concentrated from 400 mL of aqueous sample, where its concentration is as low as 1.0 ng/mL. Eight replicate determinations of 8.0 ㎍/mL of thallium in final dimethylformamide solution gave a mean absorbance of 0.160 with a relative standard deviation of 1.7%. The sensitivity for 1% absorption was 0.22 ㎍/mL. The interference of a large number of anions and cations has been studied and the optimized conditions developed were utilized for the trace determination of thallium in various alloys and biological samples.
On the absolute maximum dynamic response of a beam subjected to a moving mass
Mohammad Ali Lotfollahi-Yaghin,Hassan Jafarian Kafshgarkolaei,Hamed Allahyari,Taher Ghazvini 국제구조공학회 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.54 No.1
Taking the mid-span/center-point of the structure as the reference point of capturing the maximum dynamic response is very customary in the available literature of the moving load problems. In this article, the absolute maximum dynamic response of an Euler-Bernoulli beam subjected to a moving mass is widely investigated for various boundary conditions of the base beam. The response of the beam is obtained by utilizing a robust numerical method so-called OPSEM (Orthonormal Polynomial Series Expansion Method). It is underlined that the absolute maximum dynamic response of the beam does notnecessarily take place at the mid-span of the beam and thus the conventional analysis needs modifications. Therefore, a comprehensive parametric survey of the base beam absolute maximum dynamic response is represented in which the contribution of the velocity and weight of the moving inertial objects are scrutinized and compared to the conventional version (maximum at mid-span).
Measurement of Milwaukee Brace Pad Pressure in Adolescent Round Back Deformity Treatment
Taher Babaee,Mojtaba Kamyab,Amir Ahmadi,Mohammad Ali Sanjari,Mohammad Saleh Ganjavian 대한척추외과학회 2017 Asian Spine Journal Vol.11 No.4
Study Design: In this prospective study, we measured the pad pressures of the Milwaukee brace in adolescent hyperkyphosis treatment. Purpose: We evaluated the skin-brace interface forces exerted by the main pads of the Milwaukee brace. Overview of Literature: A fundamental factor associated with brace effectiveness in spinal deformity is pad force adjustment. However, few studies have evaluated the in-brace force magnitude and its effect on curve correction. Methods: Interface forces at four pads of the Milwaukee brace were measured in 73 patients withround back deformity (mean age,14.04±1.97 years [range, 10–18]; mean initial Cobb angle,67.70°±9.23° [range, 50°–86°]). We used a modified aneroid sphygmomanometer to measure the shoulder and kyphosis pad pressures. Each patient underwent measurement in the standing and sitting positions during inhalation/exhalation. Results: The mean pad pressures were significantly higher in the standing than in thesitting position, and significantly higher pressures were observed during inhalation compared toexhalation (p =0.001).There were no statistically significant differences between right and left shoulder pad pressures (p >0.05); however, the pressure differences between the right and left kyphosis pads were statistically significant (p <0.05). In a comparison of corrective forces with bracing for less or more than 6 months, corrective force was larger with bracing for less than 6 months (p =0.02). In the standing position, there were no statistically significant correlations between pad pressures and kyphosis curve correction. Conclusions: In the sitting position, there was a trend toward lower forces at the skin-brace interface; therefore, brace adjustment in the standing position may be useful and more effective. There was no significant correlation between the magnitude of the pad pressures and the degree of in-brace curve correction.
On the absolute maximum dynamic response of a beam subjected to a moving mass
Lotfollahi-Yaghin, Mohammad Ali,Kafshgarkolaei, Hassan Jafarian,Allahyari, Hamed,Ghazvini, Taher Techno-Press 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.54 No.1
Taking the mid-span/center-point of the structure as the reference point of capturing the maximum dynamic response is very customary in the available literature of the moving load problems. In this article, the absolute maximum dynamic response of an Euler-Bernoulli beam subjected to a moving mass is widely investigated for various boundary conditions of the base beam. The response of the beam is obtained by utilizing a robust numerical method so-called OPSEM (Orthonormal Polynomial Series Expansion Method). It is underlined that the absolute maximum dynamic response of the beam does not necessarily take place at the mid-span of the beam and thus the conventional analysis needs modifications. Therefore, a comprehensive parametric survey of the base beam absolute maximum dynamic response is represented in which the contribution of the velocity and weight of the moving inertial objects are scrutinized and compared to the conventional version (maximum at mid-span).
Hamideh Asadollahzadeh,Mehdi Ranjbar,Mohammad Ali Taher 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.6
In the present study, nanocrystalline In2S3 with differentmorphologies and particle sizes were obtainedvia an ultrasonic method by employing InCl34H2O, thioglycolic acid (TGA) and propylene glycol as In3+,sulfur source and solvent agent, respectively. Besides, the effects of preparation parameters such as timeand power of ultrasonic irradiation, solvent, and surfactant on the morphology and particle size of theproducts were studied. The synthesis procedure is simple and facile for the preparation of structureswith various morphologies. The morphology, structure, and composition of the as-synthesizednanostructures have been investigated by X-ray diffraction (XRD), energy dispersive X-ray analysis(EDX), scanning electron microscopy (SEM) and transmission electron microscopy (TEM). Opticalproperties of the as-prepared sample were investigated by photoluminescence (PL) and ultraviolet–visible (UV–vis) spectroscopy.
Hamid Fazelirad,Mehdi Ranjbar,Mohammad Ali Taher,Ghasem Sargazi 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
A magnetic multi-walled carbon nanotube nanocomposite was prepared and used as an adsorbent forremoval of amoxicillin from aqueous solutions. This nanocomposite was composed from commercialmulti-walled carbon nanotubes and iron oxide nanoparticles. The properties of this magnetic adsorbentwere characterized by scanning electron microscopy. Experiments were carried out to investigate pH ofthe solution, adsorption kinetics and capacity and the effect of adsorption dosage on the removal ofamoxicillin. Freundlich, Langmuir and D–R model were used to study the adsorption isotherms.
Using microwave heating for synthesis of SrCO3 nanostructures with different morphologies
Hasan Jahangiri,Mehdi Ranjbar,Mohammad Ali Taher,Hanif kazerooni 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.21 No.1
Strontium carbonate (SrCO3) nanostructures were synthesized successfully via simple microwaveapproach by Sr(NO3)2, carbonate powder and sodium hydroxide (NaOH) as reagents. The effects ofmicrowave time and power were investigated on product size and morphology. The products werecharacterized with X-ray diffraction pattern (XRD), scanning electron microscopy (SEM), transmissionelectron microscopy (TEM), Ultraviolet–visible (UV–vis) and room temperature photoluminescencespectroscopy (PL).
Impact of Tumor Length on Survival for Patients with Resected Esophageal Cancer
Mirinezhad, Seyed Kazem,Jangjoo, Amir Ghasemi,Seyednejad, Farshad,Naseri, Ali Reza,Mohammadzadeh, Mohammad,Nasiri, Behnam,Eftekharsadat, Amir Taher,Farhang, Sara,Somi, Mohammad Hossein Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.2
Background: Tumor length in patients with esophageal cancer (EC) has recently received great attention. However, its prognostic role for EC is controversial. The purpose of our study was to characterize the prognostic value of tumor length in EC patients and offer the optimum cut-off point of tumor length by reliable statistical methods. Materials and Methods: A retrospective analysis was conducted on 71 consecutive patients with EC who underwent surgery. ROC curve analysis was used to determine the optimal cut-off point for tumor length, measured with a handheld ruler after formalin fixation. Correlations between tumor length and other factors were surveyed, and overall survival (OS) rates were compared between the two groups. Potential prognostic factors were evaluated by univariate Kaplan-Meier survival analysis. A P value less than 0.05 was considered significant. Results: There were a total of 71 patients, with a male/female divide of 43/28 and a median age of 59. Characteristics were as follows: squamous/adenocarcinoma, 65/6; median tumor length, 4 (0.9-10); cut-off point for tumor length, 4cm. Univariate analysis prognostic factors were tumor length and modality of therapy. One, three and five year OS rates were 84, 43 and 43% for tumors with ${\leq}4cm$ length, whereas the rates were 75, 9 and 0% for tumors >4 cm. There was a significant association between tumor length and age, sex, weight loss, tumor site, histology, T and N scores, differentiation, stage, modality of therapy and longitudinal margin involvement. Conclusions: Future studies for modification of the EC staging system might consider tumor length too as it is an important prognostic factor. Further assessment with larger prospective datasets and practical methods (such as endoscopy) is needed to establish an optimal cut-off point for tumor length.