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排序方式: 共有169条查询结果,搜索用时 296 毫秒
41.
Suleyman Bilgin Omer Halil Çolak Ovunc Polat Etem Koklukaya 《Expert systems with applications》2009,36(6):10078-10084
Heart Rate Variability (HRV) is an efficient tool for assessment of Sympathovagal Balance (SB) and classification of cardiac disturbances. However, its index may be not enough for classification and evaluation of some disease. This study presents 32 new sub-bands over LF and HF base-bands that are accepted in the literature. Moreover, it determines dominant sub-bands over both base-bands in VTA database. These sub-bands are obtained using Wavelet Packet Transform (WPT) and evaluated using Multilayer Perceptron Neural Networks (MLPNN). Results are compared with obtained results from normal datasets. The domination effects of these sub-bands are assessed according to comparison of each other related to MLPNN training and test accuracy percentages by selecting different width of windows. As a result, obtained results showed that the LF zone including LF1, LF2 and LF3 sub-bands on 0.0390625–0.0859375 Hz frequency range is the most dominant over the LF base-band and, the HF zone including HF1, HF2 and HF3 on 0.1953125–0.28125 Hz frequency range is the most dominant over the HF base-band. In normal datasets, distinctive domination effect has not been determined. 相似文献
42.
Mehdi Khosravi Hadi Feizi Behzad Haghighi Suleyman I. Allakhverdiev Mohammad Mahdi Najafpour 《International Journal of Hydrogen Energy》2021,46(10):7241-7253
Photocatalysts are part of key strategies to enable green fuel. Photocatalysis and water splitting could be a promising solution to challenges associated with the intermittent nature of sunlight as a huge energy source on Earth. In this study, photo-electrochemical performance and behavior of mixed-phase titanium oxide and iron oxide heterojunction (Ti-TiOx (High-voltage)-FeOx electrode) are compared to the photo-electrochemical performance and behavior of titanium oxide nanotubes with the rutile phase and iron oxide heterojunction (TiOx-nanotubes (H2SO4/KF)-FeOx electrode). The results of photo-electrochemical experiments show that the application of stabilization potential and the presence/absence of dissolved oxygen could not be considered as significant factors affecting the photo-electrochemical properties of the Ti-TiOx (High-voltage)-FeOx and TiOx-nanotubes (H2SO4/KF)-FeOx electrodes. The Ti-TiOx (High-voltage)-FeOx electrode shows an anodic photo-electrochemical response in wavelengths shorter than 530 nm and cathodic photo-electrochemical response in wavelengths longer than 530 nm. However, the Ti-nanotubes (H2SO4/KF)-FeOx electrode consistently exhibits the anodic photo-electrochemical response. Both of the prepared heterojunctions are further characterized through Scanning Electron Microscopy, Energy-dispersive X-ray Spectroscopy, Diffuse Reflectance UV–Vis Spectroscopy, X-ray Diffraction, and Attenuated Total Reflectance Spectroscopy methods. These experiments show that despite different morphologies observed in SEM imaging data, the deposited iron oxide layers on both mixed-phase titanium oxide and titanium oxide nanotubes share the same hematite phase structure. However, only iron oxide electro-deposited on the surface of the mixed-phase titanium oxide, which contains both anatase and rutile phases, with vacant sites of oxygen, exhibits un-expected anodic and cathodic photo-electrochemical responses. Furthermore, according to the results of the characterization and photo-electrochemical investigations, the different chemical environment of mixed-phase titanium oxide, and the possible formation of different types of heterojunction structures in mixed-phase titanium oxide and iron oxide, in contrast to the titanium oxide nanotubes and iron oxide, might be considered the possible discernible reasons for the observed different photo-electrochemical responses. This paper sheds new light on photo-electrochemistry of iron oxide/mixed-phase titanium oxide heterojunction for possible solar energy conversion. 相似文献
43.
Electrothermal atomic absorption spectrometry was the method used for the direct determination of arsenic and cadmium traces in rice samples. The optimum experimental conditions were investigated in the presence of a Pd/Mg(NO3)2 modifier. For arsenic and cadmium, the detection limits were 6.1 and 0.7 μg?kg?1, whereas the characteristic concentrations were 1.33 and 0.067 μg?L?1, respectively. For the validation of the method, the concentrations of As and Cd in IRMM-804 rice flour and GBW-08503 wheat flour certified reference materials were determined after microwave-assisted digestion of the samples. The results were found within the uncertainty limits of the certified values. The different 25 rice samples sold in Turkey were digested using a microwave system and then analyzed. The average (range) As and Cd concentrations of all samples were 0.0985 (0.0204–0.1708) and 0.0314 (0.0084–0.0775) mg?kg?1, respectively. The arsenic and cadmium results were at acceptable levels. The average As and Cd amounts taken from rice are below the provisional tolerable weekly intake levels accepted by the World Health Organization. The distribution of analyte concentrations in some selected rice packages was investigated. The concentrations of both analytes were changed in a wide range even in the same packages. 相似文献
44.
Mohammad Mahdi Najafpour Fahimeh Rahimi Eva-Mari Aro Choon-Hwan Lee Suleyman I. Allakhverdiev 《Journal of the Royal Society Interface》2012,9(75):2383-2395
There has been a tremendous surge in research on the synthesis of various metal compounds aimed at simulating the water-oxidizing complex (WOC) of photosystem II (PSII). This is crucial because the water oxidation half reaction is overwhelmingly rate-limiting and needs high over-voltage (approx. 1 V), which results in low conversion efficiencies when working at current densities required for hydrogen production via water splitting. Particular attention has been given to the manganese compounds not only because manganese has been used by nature to oxidize water but also because manganese is cheap and environmentally friendly. The manganese–calcium cluster in PSII has a dimension of about approximately 0.5 nm. Thus, nano-sized manganese compounds might be good structural and functional models for the cluster. As in the nanometre-size of the synthetic models, most of the active sites are at the surface, these compounds could be more efficient catalysts than micrometre (or bigger) particles. In this paper, we focus on nano-sized manganese oxides as functional and structural models of the WOC of PSII for hydrogen production via water splitting and review nano-sized manganese oxides used in water oxidation by some research groups. 相似文献
45.
Yalcin Solak Osman Koc Ramazan Ucar Orhan Ozbek Hasan Ergenc Abduzhappar Gaipov Suleyman Turk 《Hemodialysis international. International Symposium on Home Hemodialysis》2016,20(3):407-413
Introduction Severe nephrotic syndrome is associated with increased morbidity and mortality. Renal artery embolization (RAE) has been used in a number of renal diseases such as renal tumors, arteriovenous fistulas etc. However, data regarding benefits of RAE in patients with symptomatic severe proteinuria is limited. We decided to evaluate role of RAE in the setting of severe symptomatic nephrotic syndrome. Methods Eight patients who had undergone transcatheter renal artery embolization with polyvinyl alcohol (PVA) were included. Clinico‐demographic characteristics as well as baseline laboratory data including level of proteinuria, serum albumin, C‐reactive protein and LDL cholesterol levels were recorded for each patient. After RAE, outpatient clinic control laboratory values were also assessed. Findings All patients except one underwent bilateral RAE (four simultaneous or three sequential). Two patients experienced postembolization syndrome characterized by flank pain, fever, and leukocytosis, which was self‐limited and responded to analgesics in all patients. There was no technical complications associated with RAE procedure. All patients became anuric except one. Serum albumin levels increased and serum LDL‐cholesterol levels decreased considerably in treated patients. Discussion Renal artery embolization with the purpose of amelioration in nephrotic syndrome complications was effective and free of major technical complications in our patients. 相似文献
46.
Stock trading is one of the key items in an economy and estimating its behavior and taking the best decision in it are among the most challenging issues. Solutions based on intelligent agent systems are proposed to cope with those challenges. Agents in a multiagent system (MAS) can share a common goal or they can pursue their own interests. That nature of MASs exactly fits the requirements of a free market economy. Although existing studies include noteworthy proposals on agent‐based market simulation and researchers discuss theoretical design issues of agent‐based stock exchange systems, unfortunately only a very few of the studies consider exact development and implementation of multiagent stock trading systems within the software engineering perspective and guides to the software engineers for constructing such software systems starting from scratch. To fill this gap, in this paper, we discuss the development of a multiagent‐based stock trading system by taking into consideration software design according to a well‐defined agent oriented software engineering methodology and implementation with a widely‐used MAS software development framework. Each participant in the system is first designed as belief–desire–intention agents with their facts, goals, and plans, and then belief–desire–intention reasoning and behavioral structure of the designed agents are implemented. Lessons learned during design and development within the software engineering perspective and evaluation of the implemented multiagent stock exchange system are also reported. Copyright © 2011 John Wiley & Sons, Ltd. 相似文献
47.
Cetin Saime Sebnem Efkere Halil Ibrahim Sertel Tunc Tataroglu Adem Ozcelik Suleyman 《SILICON》2020,12(12):2879-2883
Silicon - The TiO2/SiO2 film being the dielectric layer was grown on the n-Si wafer using radio frequency (RF) magnetron sputtering. Thus, the Au/TiO2/SiO2/n-Si metal-oxide-semiconductor (MOS)... 相似文献
48.
Suleyman A. Muyibi Abdul Raufu Ambali Garoot Suleiman Eissa 《Water Resources Management》2008,22(4):485-508
The paper examines the impact of development activities on water pollution in Malaysia. Hence, the main objective of this
paper is not just to examine the trends of development-induced water pollution around the region of the country but to know
where the problems are and the policy measures taken by the government. It evaluates the probable causative relationship between
problems introduced due to technology employed in water pollution control and governmental policy measures. It examines the
relationship between development indicators as sources of pollution and polluted rivers over a period of 12 years. The findings
of the paper have shown that despite the policy enforcement actions against the identified sources of water pollution, all
the three development indicators (chosen based on those identified sources) still accounted for high percentage of river pollution
in Malaysia. The findings of the paper were used to identify the central fact of the location of the problem. Some crucial
conclusions of where the problems likely to be, as reflected in the findings, are: (a) the issue of interactive-effects between
pollutants that many policy-makers are not aware of. This is when policy measures concentrate only on one source of water
pollution; (b) the enforcement strength and/or effectiveness of policy measures themselves; (c) financial constraints to invest
in appropriate technology especially sewerage systems for controlling human source of water pollution in the country; as well
as those confronting small polluting industries (d) finally, lack of cooperation between government and private business firms
to comply with regulatory policies for water pollution control. 相似文献
49.
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