The Experts below are selected from a list of 27327 Experts worldwide ranked by ideXlab platform
Fatima H. Labeed - One of the best experts on this subject based on the ideXlab platform.
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Casein Kinase 1 Underlies Temperature Compensation of Circadian Rhythms in Human Red Blood Cells.
Journal of Biological Rhythms, 2019Co-Authors: Andrew D Beale, Emily Kruchek, Stephen J. Kitcatt, Erin A. Henslee, Jack S. W. Parry, John S. O’neill, Gabriella Braun, Malcolm Schantz, Rita I. Jabr, Fatima H. LabeedAbstract:Temperature Compensation and period determination by casein kinase 1 (CK1) are conserved features of eukaryotic circadian rhythms, whereas the clock gene transcription factors that facilitate daily gene expression rhythms differ between phylogenetic kingdoms. Human red blood cells (RBCs) exhibit Temperature-compensated circadian rhythms, which, because RBCs lack nuclei, must occur in the absence of a circadian transcription-translation feedback loop. We tested whether period determination and Temperature Compensation are dependent on CKs in RBCs. As with nucleated cell types, broad-spectrum kinase inhibition with staurosporine lengthened the period of the RBC clock at 37°C, with more specific inhibition of CK1 and CK2 also eliciting robust changes in circadian period. Strikingly, inhibition of CK1 abolished Temperature Compensation and increased the Q10 for the period of oscillation in RBCs, similar to observations in nucleated cells. This indicates that CK1 activity is essential for circadian rhythms irrespective of the presence or absence of clock gene expression cycles.
Yaosheng Ning - One of the best experts on this subject based on the ideXlab platform.
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Temperature Compensation Fiber Bragg Grating Pressure Sensor Based on Plane Diaphragm
Photonic Sensors, 2018Co-Authors: Minfu Liang, Xinqiu Fang, Yaosheng NingAbstract:Pressure sensors are the essential equipments in the field of pressure measurement. In this work, we propose a Temperature Compensation fiber Bragg grating (FBG) pressure sensor based on the plane diaphragm. The plane diaphragm and pressure sensitivity FBG (PS FBG) are used as the pressure sensitive components, and the Temperature Compensation FBG (TC FBG) is used to improve the Temperature cross-sensitivity. Mechanical deformation model and deformation characteristics simulation analysis of the diaphragm are presented. The measurement principle and theoretical analysis of the mathematical relationship between the FBG central wavelength shift and pressure of the sensor are introduced. The sensitivity and measure range can be adjusted by utilizing the different materials and sizes of the diaphragm to accommodate different measure environments. The performance experiments are carried out, and the results indicate that the pressure sensitivity of the sensor is 35.7 pm/MPa in a range from 0 MPa to 50 MPa and has good linearity with a linear fitting correlation coefficient of 99.95%. In addition, the sensor has the advantages of low frequency chirp and high stability, which can be used to measure pressure in mining engineering, civil engineering, or other complex environment.
Giuseppe Palmisano - One of the best experts on this subject based on the ideXlab platform.
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high dynamic range vga with Temperature Compensation and linear in db gain control
IEEE Journal of Solid-state Circuits, 2005Co-Authors: F Carrara, Giuseppe PalmisanoAbstract:This paper presents the design and measured performance of a novel intermediate-frequency variable-gain amplifier for Wideband Code-Division Multiple Access (WCDMA) transmitters. A Compensation technique for parasitic coupling is proposed which allows a high dynamic range of 77 dB to be attained at 400 MHz while using a single variable-gain stage. Temperature Compensation and decibel-linear characteristic are achieved by means of a control circuit which provides a lower than /spl plusmn/1.5 dB gain error over full Temperature and gain ranges. The device is fabricated in a 0.8-/spl mu/m 46 GHz f/sub T/ silicon bipolar technology and drains up to 6 mA from a 2.7-V power supply.
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high dynamic range variable gain amplifier with Temperature Compensation and linear in decibel gain control
Electronics Letters, 2004Co-Authors: F Carrara, P Filoramo, Giuseppe PalmisanoAbstract:A novel intermediate-frequency variable-gain amplifier for wideband code-division multiple access transmitters is presented. The circuit includes a Compensation technique for parasitic coupling, which allows a high dynamic range of 85 dB to be attained while using a single variable-gain stage. Temperature Compensation and decibel-linear characteristic are achieved by means of a control circuit providing a lower than /spl plusmn/1.5 dB gain error over full Temperature and gain ranges.
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high dynamic range decibel linear if variable gain amplifier with Temperature Compensation for wcdma applications
International Symposium on Circuits and Systems, 2003Co-Authors: F Carrara, P Filoramo, Giuseppe PalmisanoAbstract:This paper presents the design and simulated performance of a novel intermediate-frequency variable-gain amplifier for Wideband Code-Division Multiple Access transmitters. A Compensation technique for parasitic coupling is proposed which allows the very high dynamic range of 85 dB to be attained using a single variable-gain stage. Temperature Compensation and decibel-linear control are achieved by means of a proper bias network which provides a lower than /spl plusmn/1.5 B gain error over full Temperature and gain ranges. The device has a 600 MHz bandwidth and drains up to 5.5 mA from a 2.7-V power supply. A -146-dBm/Hz output noise and -55-dBc adjacent-channel leakage power ratio are obtained under maximum gain conditions. Circuit simulations are based on a 0.8-/spl mu/m 46-GHz-f/sub T/ silicon bipolar technology.
Zhihua Feng - One of the best experts on this subject based on the ideXlab platform.
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ultrastable and highly sensitive eddy current displacement sensor using self Temperature Compensation
Sensors and Actuators A-physical, 2013Co-Authors: Hongbo Wang, Zhihua FengAbstract:Abstract This paper proposes a new method to reduce the thermal drift of eddy-current sensors (ECSs) by two orders of magnitude. Theoretical analysis shows that a well-designed bridge will help to decouple two vectors related to the resistance and inductance variations of the sensing coil of ECSs. Experiments show resistance variation has a considerably larger coefficient with Temperature change compared to that of inductance variation. Other than being neglected, resistance variation compensates for the influence of Temperature on inductance variation, which is used to derive true displacement information. A prototype ECS with high-resolution of sub-nanometer and ultrahigh thermal stability is manufactured and tested. Results show that the thermal drift of the prototype ECS is approximately 2.6 nm/°C, equivalent to 9.7 ppm/°C of the coil's inductance change. This self-Temperature Compensation method for ECS is simple, low cost, universal, very effective, and has competitive advantages in most applications.
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ultrastable and highly sensitive eddy current displacement sensor using self Temperature Compensation
Sensors and Actuators A-physical, 2013Co-Authors: Hongbo Wang, Zhihua FengAbstract:Abstract This paper proposes a new method to reduce the thermal drift of eddy-current sensors (ECSs) by two orders of magnitude. Theoretical analysis shows that a well-designed bridge will help to decouple two vectors related to the resistance and inductance variations of the sensing coil of ECSs. Experiments show resistance variation has a considerably larger coefficient with Temperature change compared to that of inductance variation. Other than being neglected, resistance variation compensates for the influence of Temperature on inductance variation, which is used to derive true displacement information. A prototype ECS with high-resolution of sub-nanometer and ultrahigh thermal stability is manufactured and tested. Results show that the thermal drift of the prototype ECS is approximately 2.6 nm/°C, equivalent to 9.7 ppm/°C of the coil's inductance change. This self-Temperature Compensation method for ECS is simple, low cost, universal, very effective, and has competitive advantages in most applications.
Minfu Liang - One of the best experts on this subject based on the ideXlab platform.
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Temperature Compensation Fiber Bragg Grating Pressure Sensor Based on Plane Diaphragm
Photonic Sensors, 2018Co-Authors: Minfu Liang, Xinqiu Fang, Yaosheng NingAbstract:Pressure sensors are the essential equipments in the field of pressure measurement. In this work, we propose a Temperature Compensation fiber Bragg grating (FBG) pressure sensor based on the plane diaphragm. The plane diaphragm and pressure sensitivity FBG (PS FBG) are used as the pressure sensitive components, and the Temperature Compensation FBG (TC FBG) is used to improve the Temperature cross-sensitivity. Mechanical deformation model and deformation characteristics simulation analysis of the diaphragm are presented. The measurement principle and theoretical analysis of the mathematical relationship between the FBG central wavelength shift and pressure of the sensor are introduced. The sensitivity and measure range can be adjusted by utilizing the different materials and sizes of the diaphragm to accommodate different measure environments. The performance experiments are carried out, and the results indicate that the pressure sensitivity of the sensor is 35.7 pm/MPa in a range from 0 MPa to 50 MPa and has good linearity with a linear fitting correlation coefficient of 99.95%. In addition, the sensor has the advantages of low frequency chirp and high stability, which can be used to measure pressure in mining engineering, civil engineering, or other complex environment.
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A fiber bragg grating pressure sensor with Temperature Compensation based on diaphragm-cantilever structure
Optik, 2017Co-Authors: Minfu Liang, Xinqiu Fang, Guang-zhe Xue, Gang Wu, Hu-wei LiAbstract:Abstract Pressure sensors are essential devices for pressure measurement and safety evaluation in modern industrial production and engineering application. According to the FBG sensing technology, this paper presents and studies a FBG pressure sensor that uses a diaphragm and a cantilever as a sensing unit. Two FBGs of this sensor are bonded on the top and bottom surfaces of the cantilever, respectively, and the center wavelength shift difference between the two FBGs is used as a measuring signal, thus improving the pressure measuring sensitivity and avoiding any effect of Temperature cross-sensitivity. The measuring principle of this sensor is introduced, and the diaphragm structure of the sensor is analyzed through theoretical calculation and finite element analysis. Experimental results indicate that this sensor has a sensitivity of 339.956 pm/MPa and a linear fitting coefficient of 99.997% in the pressure range from 0 to 10 MPa, and the maximum pressure measuring error caused in the Temperature range from 5 to 70 °C is 0.93%, so the Temperature Compensation effects are remarkable. Such a FBG pressure sensor can be extensively used for quasi-distributed long-term online monitoring of the static or dynamic pressure of liquid or gas in industrial production.
