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2.
Ramazan Kahraman 《Journal of Materials Engineering and Performance》2002,11(1):46-50
The objective of this study was to evaluate the effectiveness of sodium benzoate as an inhibitor to slow down or prevent atmospheric
corrosion/discoloration of the local mild steel during storage in the Arabian Gulf region. Test specimens were prepared from
locally produced reinforcing steel products. The inhibitor solution was applied on steel specimens at a concentration of 100
mM for 1 day at room temperature. Wooden exposure racks were used to hold as-received and inhibitor-treated specimens during
atmospheric exposure for different periods. Corrosion was evaluated through weight loss determination and electrochemical
technique. As expected, the Arabian Gulf atmosphere was corrosive on the as-received local mild steel. On the other hand,
treatment of steel with sodium benzoate lowered its corrosion rate during initial days of its exposure to atmosphere. However,
atmospheric corrosion inhibition performance of sodium benzoate deteriorated with exposure time after 30 or more days of atmospheric
exposure, and the corrosion rates of sodium benzoate-treated specimens reached that of the unprotected specimens at the end
of 90 days of atmospheric exposure. 相似文献
3.
The paper describes a prototype system called HiSQL (Historical SQL) which extends the functionality of SQL in manipulating
historical data, by providing functions for spatial and temporal processing. Conceptually the paper is divided into three
parts: the first part deals with the design and architecture of the system; the second part introduces a case study (the defters);
and the third part describes specific functions for spatial and temporal processing of serial documents. The paper concludes
with a comparison between HiSQL and SQL and suggestions for further work.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
4.
Exact solution of elasto-plastic stresses in a metal-matrix composite beam of arbitrary orientation subjected to transverse loads 总被引:1,自引:0,他引:1
An analytical elasto-plastic stress analysis is presented for a metal-matrix composite beam of arbitrary orientation subjected to a single transverse force applied to the free end of the beam and a uniformly distributed load. The material is assumed to be perfectly plastic in the elasto-plastic solution. A composite consisting of stainless-steel-reinforced aluminum was produced for this work. Sample problems are given for various orientation angles. Elastic, elastoplastic and residual normal and shear stresses are calculated. The location of the elasto-plastic boundary of the beam is obtained according to the x coordinates of the beam. 相似文献
5.
Cem??zdemir Ayse?Nilgün?Akin Ramazan?YildirimEmail author 《Korean Journal of Chemical Engineering》2003,20(5):840-843
The maximization of the total surface area of Pt-SnO2/Al2O3 catalyst was studied by using the Taguchi method of experimental design. The catalysts were prepared by sol-gel method. The
effects of HNO3, H2O and aluminum nitrate concentrations and the stirring rate on the total surface area were studied at three levels of each.
L9 orthogonal array leading nine experiments was used in the experimental design. The parameter levels that give maximum total
surface area were determined and experimentally verified. In the range of conditions studied it was found that, medium levels
of HNO3 and H2O concentration and lower levels of aluminum nitrate concentration and stirring rate maximize the total surface area. 相似文献
6.
Ramazan Selver 《Microgravity science and technology》2005,17(4):25-35
The transition from the steady to the oscillatory Marangoni convection of a floating-zone under various cold wall temperatures
and various ambient air temperature effects have been investigated experimentally by heating the sample from above (opposite
direction of Marangoni convection and buoyant forces). The heat transfer takes place mainly through conduction as well as
the natural convection of the air around the cylindrical liquid bridge. The ambient airflow in the present work is varied
by varying the cold wall temperature and ambient air temperature. In this study, the transition from the steady to the oscillatory
Marangoni convection flow of a high Prandtl number fluid in a floating half-zone is visualized by means of the already proven
method of the “light-cut-technique”. The test fluid zone is held in ambient air at +4 °C, +10 °C, +16 °C, +23 °C, and +28
°C. The onset of oscillations, the oscillation level, and oscillation pattern are investigated under various conditions. It
is found that the critical temperature difference (ΔTCr) varies substantially when the cold wall temperature and the ambient air temperature are varied. 相似文献
7.
8.
Yasin Gormez Zafer Aydin Ramazan Karademir Vehbi C. Gungor 《International Journal of Communication Systems》2020,33(11)
Detecting malicious behavior is important for preventing security threats in a computer network. Denial of Service (DoS) is among the popular cyber attacks targeted at web sites of high‐profile organizations and can potentially have high economic and time costs. In this paper, several machine learning methods including ensemble models and autoencoder‐based deep learning classifiers are compared and tuned using Bayesian optimization. The autoencoder framework enables to extract new features by mapping the original input to a new space. The methods are trained and tested both for binary and multi‐class classification on Digiturk and Labris datasets, which were introduced recently for detecting various types of DDoS attacks. The best performing methods are found to be ensembles though deep learning classifiers achieved comparable level of accuracy. 相似文献
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