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71.
M. Hilal Bilir Neslihan Şakalar Bilal Acemioğlu Evrim Baran M. Hakki Alma 《应用聚合物科学杂志》2013,127(6):4340-4351
The powders of peanut shell is first liquefied with the mixture of polyethylene glycol‐400 and monoethylene glycol (MEG) using sulfuric acid at 160°C for 2 h. Polyurethane (PU)‐type rigid foam is prepared from the reaction between peanut shell liquefied with the MEG and diphenylmethane diisocyanate. Then the PU foam is used as a sorbent for the removal of the remazol brilliant blue R from aqueous solution. The sorption of the dye increases with increasing initial concentration, temperature, and ionic strength, while decreasing with increasing pH. From the isotherm and kinetic studies, it is seen that the sorption process is in the best agreement with the Langmuir isotherm and the pseudo second‐order kinetic model. Desorption and FTIR studies show that a chemisorption process occurs between dye and foam, probably indicating electrostatic interactions. The thermodynamic parameters (i.e., standard free energy, standard enthalpy, and standard entropy) are determined, and the results obtained are discussed in detail. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci, 2013 相似文献
72.
Hakki H. Refai 《Journal of the Society for Information Display》2010,18(11):873-878
Abstract— This work is related to static volumetric crystals which scintillate light when two laser beams are intersected within the crystal. The geometry in this crystal is optimized for linear slices. Most volumetric displays are based on rotational surfaces, which generate the images, while the projected images are sliced in a rotational sweep mode. To date, the majority of 3‐D graphic engines based on static‐volume displays have not been fully developed. To use an advanced 3‐D graphic engine designed for a swept‐volume display (SVD) with a static‐volume display, the display must emulate the operation of a SVD based on a rotational‐slicing approach. The CSpace® 3‐D display has the capability to render 3‐D images using the rotational‐slicing approach. This paper presents the development of a rotational‐slicing approach designed to emulate the operation of a SVD within the image volume of a static‐volume display. The display software has been modified to divide the 3‐D image into 46 slices, each passing through the image center and rotated at a fixed angle from the previous slice. Reconstructed 3‐D images were demonstrated using a rotational‐slicing approach. Suggestions are provided for future implementations that could aid in the elimination of elongations and distortions, which occur within specified slices. 相似文献
73.
Hakki Karakas Emre Koyuncu Gokhan Inalhan 《Journal of Intelligent and Robotic Systems》2013,69(1-4):131-146
Nowadays, mini Unmanned Aerial Vehicles (UAVs) are utilized in a wide range of reconnaissance and surveillance missions with an ever increasing need for endurance and range. Thus, a slight improvement on these two primary performance parameters is considered as a competitive advantage. In this work, a multi-functional tailless UAV concept and its design process is presented. In comparison to existing conventional UAV designs, the concept is shown to have superior aerodynamic and flight performance characteristics. In addition the detachable wing and body concept provides the much needed flexibility and multi-functionality for using the UAV for a range of operation concepts, in which each concept requires different payloads of distinct weight and size. 相似文献
74.
The use of a combined anaerobic fluidized bed and zeolite fixed bed system in sanitary landfill leachate treatment was investigated. Anaerobic treatability studies were successfully performed in the anaerobic fluidized bed reactor. The chemical oxygen demand (COD) removal was attained up to 90% with increasing organic loading rates as high as 18?g?COD/L?day after 80?days of operation. Good biogas production yield (Ygas) of 0.53?L biogas per gram removed COD with methane (CH4) content of 75% was obtained. The attached biomass concentration increased along the column height from bottom to top, and its mean value was found 6,065?mg/L after 100?days of operation. The anaerobically treated landfill leachate was further treated by a zeolite fixed bed reactor. While excellent ammonia removal (>90%) was obtained with the untreated zeolite, the regenerated zeolites showed higher performance. Consequently, this combined anaerobic and adsorption system is an effective tool to remove high COD and high ammonia in landfill leachate. 相似文献
75.
Arzu KAHVECI Elif ARI Hakki ARIKAN Mehmet KOC Serhan TUGLULAR Cetin OZENER 《Hemodialysis international. International Symposium on Home Hemodialysis》2010,14(1):91-93
We report the case of a 54-year-old hemodialysis patient who presented with recurrent fever due to Streptococcus bovis bacteremia related to colonic tubulovillous adenoma. Following polypectomy and broad-spectrum antibiotic therapy, the patient totally recovered. In this paper, we discussed the relation between S. bovis bacteremia, colonic adenomas, and hemodialysis. Awareness of this association is critical for early diagnosis and management. 相似文献
76.
Ercan Yildiz Abdullah Aydin Ismail Hakki Sarpun Eyyup Tel 《Journal of Fusion Energy》2017,36(4-5):149-151
Structural material selection in design of fusion reactors is very crucial. These structural materials should satisfy the hard conditions such as high thermo-mechanical stresses, high heat loads and severe radiation damage without compromising on safety considerations. The materials such as titanium, vanadium and chromium are used in the construction of fusion reactors. Therefore, it is important to examine these materials. Obtained results from the nuclear reactions using structural materials can be used for developing of these structural materials. For this reason, in this study cross sections of the 46Ti(α,n) 49Cr, 50Cr(α,n) 53Fe and 51V(α,n) 54Mn reactions have been calculated at 2–20 MeV energy range. In these theoretical calculations, the TALYS 1.8 and NON-SMOKER codes were used. Also, the astrophysical S-factors which describe the possibility of reaction in low energies were calculated. Results of our calculations were checked to the experimental data obtained from EXFOR database. 相似文献
77.
The temporal behavior of the spectra of distributed-feedback (DFB) lasers is studied under high-bit-rate (2 Gb/s) modulation. The optical spectra are obtained by dithering the off-state laser bias current with a low-frequency (1 kHz) low-amplitude (2 mA) current. It is found that some lasers have side modes that emit only during the first ~125 ps of the pulse. During this short time interval, the intensity of the side mode emission is at least 10 dB stronger than that obtained from time averaged spectra. This technique is useful in understanding the high-speed dynamics of rapidly modulated DFB spectra 相似文献
78.
We have studied the performance of In1-x Gax Asy P1-y buried heterostructure (BH) 1.3-μm lasers in the microwave range. This study consisted of small-signal, large-signal, and digital pseudo-random word evaluation of these lasers. The small-signal study pointed out the impact of the oxide stripe capacitance on the laser response at microwave frequencies. The large-signal study uncovered basic laser non-linearities that affect the temporal response, spectral broadening, and wavelength chirp. Finally, digital pseudo-random word tests performed at 1.7 Gbit/s indicated that in spite of these inherent laser nonlinearities, the 1.3-μm BH lasers performed well enough to be considered as promising sources for gigabit optical communication systems. 相似文献
79.
In this paper 40 Gb/s and 100 Gb/s Coherent optical Orthogonal Frequency Division Multiplexing (CO-OFDM) systems are studied to obtain the relation between the bit error rate (BER) and transmission link distance for a constant signal to noise ratio (SNR). Utilizing Dense Wavelength Division Multiplexing (DWDM) with 192 optical channels in C and L bands (1528.77 nm–1612.65 nm), data rates can theoretically reach up to 19 Tb/s (192?100 Gb/s) using only one optical fiber core. In this research, we selected the same data rates with the IEEE standards published by IEEE Computer Society in 2010 and 2011. Results show the performance of the CO-OFDM system at different data rates and distances for one RF carrier and one optical carrier instead of 4 optical carriers used in IEEE 802.3ba. 相似文献
80.