TUBITAK - Marmara Research Center | Date: 2015-05-07
This invention relates to a formulation and the lens manufacturing process in the areas of medicine, ophthalmology, cataracts and cataract surgery for the production of mainly intraocular lens (IOL) which is flexible, biocompatible and has long-shelf life.
TUBITAK - Marmara Research Center | Date: 2015-04-06
This invention relates to an apparatus suitable to be used for analyzing at least one sample with an electrochemical sensor array, comprising at least one upper layer; at least one inlet and at least one outlet opening provided on the upper layer; at least one lower layer having at least one recess thereon; at least one two-sided adhesive membrane matching to the recess; at least one sensor array secured to the lower layer, at least one reference electrode, at least one counter electrode, at least one communication channel, at least one conductive line providing a connection between the working electrode and the communication channel on at least one plate; at least one further two-sided adhesive membrane spaced from the adhesive membrane positioned on the lower layer and enabling the sensor array to be secured to the upper layer.
Cinar M.E.,Technical University of Istanbul |
Ozturk T.,Technical University of Istanbul |
Ozturk T.,TUBITAK - Marmara Research Center
Chemical Reviews | Year: 2015
A study was conducted to examine the syntheses and properties of oligomers and polymers based on fused thiophenes, such as thienothiophenes, dithienothiophenes, and thienoacenes made up exclusively of two or more thiophenes, along with their applications. A modified approach was applied to synthesize 3-hydroxythieno[3,2-b]thiophene from 3-bromothiophene. Formation of 3-lithiothiophene was followed by addition of elemental sulfur and α-chloroacetic acid to obtain the carboxylic acid which under hot acidic conditions formed 3-hydroxythieno[3,2-b]thiophene.
Birol Y.,TUBITAK - Marmara Research Center
Tribology International | Year: 2013
The frictional forces arising from sliding contact with aluminium produce considerable shear stresses on the CrN coating that degrade its integrity and its adhesion to the substrate tool steel. The CrN coating suffers the most extensive wear damage. There is a net improvement in the sliding wear performance of the AlCrN coating owing to a multilayered structure and a much higher hardness. However, AlTiN outperforms both CrN and AlCrN in sliding contact against aluminium owing to its exceptionally high chemical resistance against aluminium. The superiority of the AlTiN coating is confirmed by wear rates estimations. © 2012 Elsevier Ltd.
Birol Y.,TUBITAK - Marmara Research Center
Journal of Alloys and Compounds | Year: 2012
The potential of AlB3 master alloy in the grain refinement of AlSi10Mg and AlSi12Cu foundry alloys was investigated and compared with that of the AlTi5B1 master alloy, the standard grain refiner for most aluminium foundries. The latter refines the grain structures of both alloys. However, this performance is not nearly as good as that obtained in wrought aluminium alloys with the same grain refiner. The Ti-free AlSi10Mg and AlSi12Cu alloys, on the other hand, exhibit very small grains for the entire range of holding times when inoculated with AlB3. This implies a remarkable grain refining efficiency, typical of grain refined wrought aluminium alloys, as well as a strong resistance to fading of the grain refinement effect. Lack of Ti in the melt allows the entire B to form AlB 2 particles, the perfect substrates, shortly before α-Al starts to crystallize. Aluminium castings can enjoy grains as small as those of the wrought alloys, well below 200 μm, with an addition of 0.02 wt% B provided that their Ti content is controlled. © 2011 Elsevier B.V. All rights reserved.
TUBITAK - Marmara Research Center | Date: 2014-01-24
The averaged pulse energy (J) of a Pulsed Type Laser Source can be measured by several types of commercial laser energy meters, such as pyroelectric detector or thermopile sensor, the spectral responsivity and the time/frequency related response properties of which are compatible with those of the Pulsed Type Laser Source. These Commercial Laser Energy Meters, regardless of sensor/detector type, should be calibrated against the working standards calibrated in a national (or an international) traceability chain relying on primary standards on the highest level having the lowest uncertainty in realizations of the fundamental SI units. FCIS based-LEMCS designed in this invention accomplishes both of the above proficiencies of measuring the averaged pulse energy of the Pulsed Type Laser Source and calibrating the Commercial Laser Energy Meters, which are traceably to primary level standards. FCIS based-LEMCS contains an integrating sphere having a novel port and an interior design and a series of mechanical choppers having separate Duty Cycles, each of which is rotated by an electrical motor in FCIS based-LEMCS, used for generating a chopped type laser, called as Chopped Type Laser Source, in order to provide the reference and averaged pulse energy for traceable calibration of Commercial Laser Energy Meters. With this invention, in addition to generating the reference and averaged pulse energy to be used during the calibration of Commercial Laser Energy Meters to be performed by means of FCIS based-LEMCS, the peak pulse energies of the Pulsed Type Laser Source and the Chopped Type Laser Source, which is a strict part of FCIS based-LEMS and which is used for producing the reference averaged pulse energy in the calibration of Commercial Laser Energy Meters, are also measured by FCIS based-LEMCS, traceable to Electrical Substitution Cryogenic Radiometer (ESCR) in primary optical watt scale (W), to ^(133)Cs (or ^(87)Rb) Atomic Frequency Standard in time scale t (s), and to direct current unit (A) realized with Quantum Hallprimary resistance standard (ohm) and DC Josephson primary voltage standard (V). With this configuration presented as a preferred embodiment, the averaged pulse energy measurements are performed and achieved for a range extending from 16.5 p J to 100 mJ.
TUBITAK - Marmara Research Center | Date: 2013-06-20
The drift (/h) for an interferometric fiber optic gyroscope (IFOG) means the variations on the voltage generated versus the zero angular (rotation) rate, whilst IFOG is not under influence of any angular rate effect. If the drift of an IFOG is predefined, the compensation of the drift can trivially be carried out by a subtraction process. However, with this invention, the necessity of the predefinition of the zero rotation rate voltage of the IFOG which belongs to the primary coil called Gyro Coil herein, is removed because the instantaneous variations on the zero rotation rate voltage of the IFOG can be monitored either periodically or whenever required with help of a secondary coil, called as Monitor Coil, which is able to be switched by a microcontroller controlled-MEMS fiber optic ON/OFF switches. The new configuration of IFOG, to be referred as Dynamical Drift Monitoring-Interferometric Fiber Optic Gyroscope (DDM-IFOG) and the new method presented and implemented in this invention are valid for IFOG having open-loop and closed-loop schemes by engaging the voltage of zeroing the total phase (Feedback Phase plus Sagnac Phase Shift) in the sensing coil instead of directly using the voltage of the demodulation circuit induced by the Sagnac Phase Shift (SPS).
TUBITAK - Marmara Research Center | Date: 2013-07-24
Novel random number generation methods and novel random number generators based on continuous-time chaotic oscillators with dual oscillator architecture were presented. Numerical and experimental results presented in this innovation not only verify the feasibility of the proposed circuits, but also encourage their use as the core of a high-performance IC TRNG as well. In comparison with RNGs based on discrete-time chaotic maps, amplification of a noise source and jittered oscillator sampling, which are advantageous in the sense that true random behavior can be mathematically proven thanks to an analytical model that has been developed, it is seen that RNGs based on continuous-time chaotic oscillators with the proposed innovation can offer much higher and constant data rates without post-processing. The proposed innovation is an enhanced design where dual oscillator architecture is exploited with continuous-time chaos in order to increase the throughput and to maximize the statistical quality of the output sequence and to be robust against external interference, parameter variations and attacks aimed to force throughput. In conclusion, we can deduce that the proposed circuits can be integrated on today process at GHz range and the use of continuous-time chaos with the proposed RNGs is very promising in generating random numbers with very high throughput.
TUBITAK - Marmara Research Center | Date: 2013-10-10
The present invention discloses the syntheses of new 3-hydroxyflavone salts with defined structures, which are suitable for sensor applications for sensing anions, cations, DNA chains and organic compounds soluble in highly polar solvent like water.
TUBITAK - Marmara Research Center | Date: 2013-06-19
Novel random number generation methods and novel random number generators with a dual architecture comprising a fast oscillator and a noise source are presented. Numerical and experimental results presented in this innovation not only verify the feasibility of the proposed circuits, but also encourage their use as the core of a high-performance IC TRNG as well. The proposed innovation is an enhanced design where dual architecture is exploited in order to increase the throughput and to maximize the statistical quality of the output sequence and to be robust against external interference, parameter variations and attacks aimed to force throughput. In conclusion, we can deduce that the proposed circuits can be integrated on today process at GHz range and the use of the proposed RNGs is very promising in generating random numbers with very high throughput.