The effect of the temperature-dependent nonlinearities on the temperature stability of micromechanical resonators

2013 ◽  
Vol 114 (15) ◽  
pp. 153513 ◽  
Author(s):  
Hyung Kyu Lee ◽  
Renata Melamud ◽  
Bongsang Kim ◽  
Saurabh Chandorkar ◽  
James C. Salvia ◽  
...  
Keyword(s):  
Temperature Stability ◽  
Temperature Dependent ◽  
Micromechanical Resonators

Influence of the temperature dependent nonlinearities on the performance of micromechanical resonators

2011 ◽  
Vol 99 (19) ◽  
pp. 194102 ◽  
Author(s):  
Hyung Kyu Lee ◽  
Bongsang Kim ◽  
Renata Melamud ◽  
Matthew A. Hopcroft ◽  
James C. Salvia ◽  
...  
Keyword(s):  
Temperature Dependent ◽  
Micromechanical Resonators

Temperature-dependent behaviours of electro-elastic constants for the Bi2ZnB2O7 piezoelectric crystal

CrystEngComm ◽  
2021 ◽  
Author(s):  
Feifei Chen ◽  
Chao Jiang ◽  
Fapeng Yu ◽  
Xiufeng Cheng ◽  
Xian Zhao
Keyword(s):  
Elastic Constants ◽  
Temperature Stability ◽  
Piezoelectric Crystal ◽  
Temperature Dependent

The BZBO crystals were found to present good temperature stability of elastic compliances.

GaN Schottky Barrier Diodes with TiN Electrode for Microwave Power Transmission

2019 ◽  
Vol 954 ◽  
pp. 126-132
Author(s):  
Tao Fei Pu ◽  
Xiao Bo Li ◽  
Xiao Wang ◽  
Yu Yu Bu ◽  
Liu An Li ◽  
...  
Keyword(s):  
Schottky Barrier ◽  
Microwave Power ◽  
Power Transmission ◽  
Temperature Stability ◽  
Schottky Barrier Diodes ◽  
Temperature Dependent ◽  
Current Voltage ◽  
Current Voltage Characteristics ◽  
Anode Area ◽  
Tin Anode

In this study, TiN anode GaN Schottky barrier diodes (SBDs) with a low access sheet resistance of 28 Ω/□ were fabricated for microwave power transmission application. The performance of the diodes at room temperature (RT) is comparable with the ideality factor n and Schottky barrier height (SBH) were 1.28 and 0.47 eV for the 8-finger SBDs, 1.22 and 0.49 eV for the 16-finger SBDs, respectively. A low on-resistance of 5.71 and 3.58 Ω were obtained for 8-and 16-finger SBD at RT, respectively. The low series resistance induced by larger anode area of 16-finger SBDs results in a lower turn-on voltage of 0.47 V compared with that of 0.68 V for the 8-finger one. Besides, the temperature dependent current-voltage characteristics demonstrate that the TiN anode has a good temperature stability. And the temperature dependent performance of the 16-finger SBDs present a better uniformity than that of the 8-finger SBDs.

(111) Monocrystalline Nickel Films

1972 ◽  
Vol 30 ◽  
pp. 512-513
Author(s):  
T.E. Pratt ◽  
R.W. Vook
Keyword(s):  
Film Thickness ◽  
Deposition Rate ◽  
Room Temperature ◽  
Narrow Range ◽  
High Vacuum ◽  
Residual Pressure ◽  
Temperature Dependent ◽  
Deposition Parameters ◽  
Transmission Electron ◽  
Substrate Temperatures

(111) oriented thin monocrystalline Ni films have been prepared by vacuum evaporation and examined by transmission electron microscopy and electron diffraction. In high vacuum, at room temperature, a layer of NaCl was first evaporated onto a freshly air-cleaved muscovite substrate clamped to a copper block with attached heater and thermocouple. Then, at various substrate temperatures, with other parameters held within a narrow range, Ni was evaporated from a tungsten filament. It had been shown previously that similar procedures would yield monocrystalline films of CU, Ag, and Au.For the films examined with respect to temperature dependent effects, typical deposition parameters were: Ni film thickness, 500-800 A; Ni deposition rate, 10 A/sec.; residual pressure, 10-6 torr; NaCl film thickness, 250 A; and NaCl deposition rate, 10 A/sec. Some additional evaporations involved higher deposition rates and lower film thicknesses.Monocrystalline films were obtained with substrate temperatures above 500° C. Below 450° C, the films were polycrystalline with a strong (111) preferred orientation.

In Vitro Effects of Urokinase — Prevention by Different Inhibitors

1990 ◽  
Vol 64 (03) ◽  
pp. 402-406 ◽  
Author(s):  
M D Oethinger ◽  
E Seifried
Keyword(s):  
In Vitro Study ◽  
Thrombin Time ◽  
Plasma Samples ◽  
Temperature Dependent ◽  
Chloromethyl Ketone ◽  
Control Value ◽  
Dose Time ◽  
In Vitro Effects ◽  
Full Protection

SummaryThe present in vitro study investigated dose-, time- and temperature-dependent effects of two-chain urokinase plasminogen activato(u-PA, urokinase) on normal citrated plasma. When 10 μg/ml u-PA wereadded to pooled normal plasma and incubated for 30 min at an ambient temperature (25° C), α2-antiplas-min decreased to 8% of the control value. Incubation on ice yielded a decrease to 45% of control,whereas α2-antiplasmin was fully consumed at 37° C. Fibrinogen and plasminogen fell to 46% and 39%, respectively, after a 30 min incubation at 25° C. Thrombin time prolonged to 190% of control.Various inhibitors were studied with respect to their suitability and efficacy to prevent these in vitro effects. Aprotinin exhibited a good protective effect on fibrinogen at concentrations exceeding 500 KlU/ml plasma. Its use, however, was limited due to interferences with some haemostatic assays. We could demonstrate that L-Glutamyl-L-Glycyl-L-Arginyl chloromethyl ketone (GGACK) and a specific polyclonal anti-u-PA-antibody (anti-u-PA-IgG) effectively inhibited urokinase-induced plasmin generation without interfering with haemostatic assays. The anti-u-PA-antibody afforded full protection ofα2-antiplasmin at therapeutic levels of u-PA.It is concluded that u-PA in plasma samples from patients during thrombolytic therapy may induce in vitro effects which should be prevented by the use of a suitable inhibitor such as GGACK or specific anti-u-PA-antibody.

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