Experimental characterization of thermoelectric properties of thick film composites

2006 ◽  
Vol 3 (2) ◽  
pp. 95-99 ◽  
Author(s):  
Piotr Markowski ◽  
Andrzej Dziedzic
Keyword(s):  
Thick Film ◽  
Thermoelectric Properties ◽  
Electrical Power ◽  
Internal Resistance ◽  
Ageing Processes ◽  
Reference Track ◽  
Potential Use ◽  
Film Composites

This paper presents thermoelectric properties of thick-film composites in relation to their potential use as power microgenerators. Several different combinations of composites were used to create thermopiles. One track of each thermocouple was made of PdAg or Pt and was the reference track and the second one of the tested material. After preliminary tests five composites with low resistance and adequate Seebeck coefficient were chosen (Ag, Ag+RuO2 and three kinds of RuO2). We measured the Thermoelectric Force, ET = f(T) and internal resistance Ri = f(T) characteristics over the temperature range 293 to 493 K. PdAg/Ag thermocouples have nearly two orders of magnitude higher output electrical power than the others. The change in values of electrical parameters of thermopiles after long-term ageing processes was also investigated.

Characterization of Thick Film Technology for 300°C Packaging

2010 ◽  
Vol 2010 (HITEC) ◽  
pp. 000097-000107 ◽  
Author(s):  
Rui Zhang ◽  
R. Wayne Johnson ◽  
Vinayak Tilak ◽  
Tan Zhang ◽  
David Shaddock
Keyword(s):  
Thick Film ◽  
Analog Circuits ◽  
Passive Components ◽  
Term Operation ◽  
C Storage ◽  
Selection Of ◽  
Device Technology ◽  
Thick Film Technology

Geothermal well logging and instrumentation applications require electronics capable of 300°C operation. SiC device technology enables the design and fabrication of analog circuits that can operate at these temperatures. However, to build functional circuits, an interconnection and packaging technology must be demonstrated to provide interconnectivity between different SiC devices and passive components. For long-term operation, organic based packaging is limited to ∼250°C with careful selection of materials. Thick film technology based on ceramics and metals has potential for higher operating temperatures. In this work the effect of 300°C storage on the adhesion of different thick film Au conductors and a multilayer dielectric have been studied. In addition, the electrical properties of the dielectric have been studied as a function of temperature and of high temperature aging. Assembly technologies: component attach, wire bonding and external lead attach have also been investigated and the results are reported.

Characterization of LTCC-Thick Film Technology for 300°C Packaging

2011 ◽  
Vol 2011 (HITEN) ◽  
pp. 000046-000051 ◽  
Author(s):  
Tan Zhang ◽  
David Shaddock ◽  
Alexey Vert ◽  
Rui Zhang ◽  
R. Wayne Johnson
Keyword(s):  
Thick Film ◽  
Reservoir Characterization ◽  
Temperature Cycling ◽  
Potential Candidate ◽  
Term Operation ◽  
Die Attach ◽  
Functional Analog ◽  
Thick Film Technology

Economic geothermal well construction and reservoir characterization requires high temperature logging tools and sensors with the long-term operation capability of 300°C. Low temperature co-fired ceramic (LTCC) and thick film technology make them a potential candidate for building interconnects to SiC device and functional analog or digital circuits to operate at that temperature. In this work, single conductor layer LTCC substrates have been fabricated to characterize the thick film Au adhesion under 300°C aging. Via reliability has been evaluated on the multi-layer LTCC substrates under temperature cycling of 35–325°C. In addition, die attach, wire bonding and stud bumping assembly techniques has been investigated.

scholarly journals Characterization of high-precision resistive voltage divider and buffer amplifier for ac voltage metrology

2019 ◽  
Vol 10 ◽  
pp. 8
Author(s):  
Bjørnar Karlsen ◽  
Kåre Lind ◽  
Helge Malmbekk ◽  
Per Ohlckers
Keyword(s):  
High Precision ◽  
Electrical Power ◽  
Voltage Divider ◽  
Long Term Stability ◽  
Wide Range ◽  
Precision Voltage ◽  
Best Fit ◽  
Better Than

A high-precision voltage buffer and a 10:1 resistive voltage divider have been constructed for use in ac voltage and electrical power metrology. Long-term stability of the buffer's dc response has been demonstrated by two dc sweeps performed 20 days apart, with best-fit linearized gain varying less than 1 μV/V. The absolute ac gain has been measured using a high-precision digital multimeter for 10 Hz and 1 kHz with results consistent with dc within 5 μV/V. This value agrees with the characterization of ac–dc difference using thermal converters from different producers with a variety of resistance for various voltages from 1 V to 5 V. The ac–dc difference was further characterized better than 40 μV/V for the same voltages up to 100 kHz and better than 100 μV/V for 3 V at 1 MHz. Absolute ac gain and ac–dc difference has also been measured for the voltage divider and buffer combination from 10 V to 50 V, with similar agreement up to 1 kHz. The ac–dc difference from 10 Hz to 100 kHz of this combination shows an agreement well within 30 μV/V in this entire voltage span with a total response not exceeding 125 μV/V. This make the voltage divider and buffer combination suitable for sampling electrical powers for a wide range of voltages.

Treatment and secondary prevention of venous thromboembolism in cancer patients

2012 ◽  
Vol 03 (03) ◽  
pp. 121-125
Author(s):  
I. Pabinger ◽  
C. Ay
Keyword(s):  
Clinical Trials ◽  
Venous Thromboembolism ◽  
Cancer Patients ◽  
Oral Anticoagulants ◽  
Factor Xa ◽  
New Oral Anticoagulants ◽  
Phase Iii ◽  
Patients With Cancer ◽  
Potential Use

SummaryCancer is a major and independent risk factor of venous thromboembolism (VTE). In clinical practice, a high number of VTE events occurs in patients with cancer, and treatment of cancerassociated VTE differs in several aspects from treatment of VTE in the general population. However, treatment in cancer patients remains a major challenge, as the risk of recurrence of VTE as well as the risk of major bleeding during anticoagulation is substantially higher in patients with cancer than in those without cancer. In several clinical trials, different anticoagulants and regimens have been investigated for treatment of acute VTE and secondary prophylaxis in cancer patients to prevent recurrence. Based on the results of these trials, anticoagulant therapy with low-molecular-weight heparins (LMWH) has become the treatment of choice in cancer patients with acute VTE in the initial period and for extended and long-term anticoagulation for 3-6 months. New oral anticoagulants directly inhibiting thrombin or factor Xa, have been developed in the past decade and studied in large phase III clinical trials. Results from currently completed trials are promising and indicate their potential use for treatment of VTE. However, the role of the new oral thrombin and factor Xa inhibitors for VTE treatment in cancer patients still has to be clarified in further studies specifically focusing on cancer-associated VTE. This brief review will summarize the current strategies of initial and long-term VTE treatment in patients with cancer and discuss the potential use of the new oral anticoagulants.

scholarly journals Characterization of Highly Irradiated ALPIDE Silicon Sensors

Universe ◽  
2019 ◽  
Vol 5 (4) ◽  
pp. 91
Author(s):  
Valentina Raskina ◽  
Filip Křížek
Keyword(s):  
Nuclear Physics ◽  
Detection Efficiency ◽  
Tracking System ◽  
Physics Institute ◽  
Total Ionization ◽  
Silicon Sensors ◽  
Active Pixel ◽  
Academy Of Sciences

The ALICE (A Large Ion Collider Experiment) experiment at CERN will upgrade its Inner Tracking System (ITS) detector. The new ITS will consist of seven coaxial cylindrical layers of ALPIDE silicon sensors which are based on Monolithic Active Pixel Sensor (MAPS) technology. We have studied the radiation hardness of ALPIDE sensors using a 30 MeV proton beam provided by the cyclotron U-120M of the Nuclear Physics Institute of the Czech Academy of Sciences in Řež. In this paper, these long-term measurements will be described. After being irradiated up to the total ionization dose 2.7 Mrad and non-ionizing energy loss 2.7 × 10 13 1 MeV n eq · cm - 2 , ALPIDE sensors fulfill ITS upgrade project technical design requirements in terms of detection efficiency and fake-hit rate.

scholarly journals Microstructure and Thermoelectric Properties of (Bi0.48Sb1.52)Te3 Thick Films Prepared with Tape Casting Method

Electronics ◽  
2021 ◽  
Vol 10 (2) ◽  
pp. 140
Author(s):  
Lichen Liu ◽  
Ziping Cao ◽  
Min Chen ◽  
Jun Jiang
Keyword(s):  
Thermoelectric Properties ◽  
Low Cost ◽  
Thick Films ◽  
Tape Casting ◽  
Casting Process ◽  
Casting Method ◽  
Glass Substrates ◽  
Conductive Films ◽  
Casting Technology

This paper reports the fabrication and characterization of (Bi0.48Sb1.52)Te3 thick films using a tape casting process on glass substrates. A slurry of thermoelectric (Bi0.48Sb1.52)Te3 was developed and cured thick films were annealed in a vacuum chamber at 500–600 °C. The microstructure of these films was analyzed, and the Seebeck coefficient and electric conductivity were tested. It was found that the subsequent annealing process must be carefully designed to achieve good thermoelectric properties of these samples. Conductive films were obtained after annealing and led to acceptable thermoelectric performance. While the properties of these initial materials are not at the level of bulk materials, this work demonstrates that the low-cost tape casting technology is promising for fabricating thermoelectric modules for energy conversion.

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