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RISS 인기검색어
- 검색키워드
- 저자 : Ahmet Altin (검색결과 6 건)
- 무료
- 기관 내 무료
- 유료
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Altin, Sureyya,Altin, Ahmet The Korean Electrochemical Society 2019 Journal of electrochemical science and technology Vol.10 No.1
Supported liquid membrane process usually is used for recovering or enrichment of valuable metals in the industrial wastewater. But, even if the metals in the wastewater was separated with high chemical selectivity, it cannot be enough concentrated since separation performance of supported liquid membrane (SLM) process is limited by concentration gradient between feed solution and stripping solution. If metal concentration in the stripping solution to be enough low, transport of metal through membrane can be accomplishment constantly. Therefore, Electrodialysis (ED) has been placed after SLM process and the stripping solution of SLM was used as the feed solution for the ED process. Transport of ions in the solutions is successfully performed by ED process. Thus, the metal concentration in the stripping solution does not rise as to stop ion transport. Besides, valuable metals easily are concentrated by ED process for re-use. In this study, effects of operation parameters like initial Cd(II) concentration, HCl concentration in the feed solution of SLM and applied voltage are investigated on separation efficiency, flux and permeability of the both processes. As the feed solution concentration increased, all performance values has increased. When initial concentration of 100 mg/L is used, separation performances (SP) are 55% and 70%, for SLM and consecutive process, respectively. The best HCl concentration in the feed solution of SLM has determined as 2 M, in this conditions SP are 64% and 72%, for SLM and consecutive process, respectively. With increased of applied voltage on ED process, SP of the consecutive process has been raised from 72% to 83%. According to the obtained experimental data, consecutive process has better separation performance than SLM. When the separation performances of both processes were compared for the same operating conditions, it was determined higher the separation efficiency, permeability and flux values of the consecutive process, 8%, 9% and %10.6, respectively. Consequently, the use of the consecutive process increases the performance efficiency of both processes. The consecutive process studied has quite a good chemical separation efficiency, and enrichment capability. Moreover, this process requires few water and energy.
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Sureyya Altin,Elif Oztekin,Ahmet Altin 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.8
Electrodialysis (ED) and electrodialysis reversal (EDR) processes have been often used for separation of ions in dilute solutions. In this study, the performance of ED and EDR processes has been examined in the removal of copper from the dilute solutions. First, applied voltage, initial concentration, flow rate, type of electrolyte and the effect of concentration were determined for both processes. Then, separation efficiency, current efficiency, energy requirement and material flux of the processes were calculated, and the performances of the processes were compared. The separation efficiency and energy consumption of EDR process were higher compared to ED process under equal operating conditions. Also, the current efficiency (39.58%) of EDR process was lower than the current efficiency (67.46%) of ED process. It can be said that the ED process is more suitable in terms of energy consumption for separation in the low flow rate and concentration.
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RULED SURFACES IN E<sup>3</sup> WITH DENSITY
Altin, Mustafa,Kazan, Ahmet,Karadag, H.Bayram The Honam Mathematical Society 2019 호남수학학술지 Vol.41 No.4
In the present paper, we study curves in 𝔼<sup>3</sup> with density $e^{ax^2+by^2}$, where a, b ∈ ℝ not all zero constants and give the parametric expressions of the curves with vanishing weighted curvature. Also, we create ruled surfaces whose base curves are the curve with vanishing weighted curvature and the ruling curves are Smarandache curves of this curve. Then, we give some characterizations about these ruled surfaces by obtaining the mean curvatures, Gaussian curvatures, distribution parameters and striction curves of them.
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LAPLACE-BELTRAMI MINIMALITY OF TRANSLATION HYPERSURFACES IN E<sup>4</sup>
( Ahmet Kazan ),( Mustafa Altin ) 호남수학회 2023 호남수학학술지 Vol.45 No.2
In the present paper, we study translation hypersurfaces in E<sup>4</sup>. In this context, firstly we obtain first, second and third Laplace- Beltrami (LB<sup>I</sup>, LB<sup>II</sup> and LB<sup>III</sup>) operators of the translation hypersurfaces in E<sup>4</sup>. By solving second and third order nonlinear ordinary differential equations, we prove theorems that contain LB<sup>I</sup>-minimal, LB<sup>II</sup>-minimal and LB<sup>III</sup>-minimal translation hypersurfaces in E<sup>4</sup>.
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Ruled surfaces in $E^{3}$ with density
Mustafa Altin,Ahmet Kazan,H.Bayram Karadag 호남수학회 2019 호남수학학술지 Vol.41 No.4
In the present paper, we study curves in $\mathbb{E}^{3}$ with density $e^{ax^{2}+by^{2}},$ where $a,b\in \mathbb{R}$ not all zero constants and give the parametric expressions of the curves with vanishing weighted curvature. Also, we create ruled surfaces whose base curves are the curve with vanishing weighted curvature and the ruling curves are Smarandache curves of this curve. Then, we give some characterizations about these ruled surfaces by obtaining the mean curvatures, Gaussian curvatures, distribution parameters and striction curves of them.
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RULED SURFACES IN E<sup>3</sup> WITH DENSITY
( Mustafa Altin ),( Ahmet Kazan ),( H. Bayram Karadag ) 호남수학회 2019 호남수학학술지 Vol.41 No.4
In the present paper, we study curves in E<sup>3</sup> with den- sity e<sup>ax2+by2 </sup>, where a, b ∈ R not all zero constants and give the parametric expressions of the curves with vanishing weighted cur- vature. Also, we create ruled surfaces whose base curves are the curve with vanishing weighted curvature and the ruling curves are Smarandache curves of this curve. Then, we give some characteriza- tions about these ruled surfaces by obtaining the mean curvatures, Gaussian curvatures, distribution parameters and striction curves of them.
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