Long-Term Aging Effect on Coercive Force in Amorphous Magnetic Cores and Estimation of Its Deterioration at Operating Temperature

1991 ◽  
Vol 30 (Part 1, No. 11A) ◽  
pp. 2765-2769 ◽  
Author(s):  
Yukihiko Ohta ◽  
Hidenori Kakehashi ◽  
Minoru Fukuhara ◽  
Hirotoshi Fukunaga
Keyword(s):  
Coercive Force ◽  
Operating Temperature ◽  
Aging Effect ◽  
Magnetic Cores

BLENDALLOY 25-7904

Alloy Digest ◽  
1972 ◽  
Vol 21 (11) ◽  
Keyword(s):  
Corrosion Resistance ◽  
Coercive Force ◽  
Physical Properties ◽  
Surface Treatment ◽  
Tensile Properties ◽  
Heat Treating ◽  
Magnetic Shielding ◽  
High Permeability ◽  
Magnetic Cores ◽  
Very High

Abstract BLENDALLOY 25-7904 is an 80% nickel-15% iron-5% molybdenum alloy having very high permeability and low coercive force for magnetic cores in such applications as transformer laminations, sensitive magnetic amplifiers and magnetic shielding. This datasheet provides information on composition, physical properties, hardness, and tensile properties. It also includes information on corrosion resistance as well as forming, heat treating, machining, joining, and surface treatment. Filing Code: Ni-181. Producer or source: Spang Industries Inc..

Investigation of Mixed Conducting Cathode for Metal-Supported SOFC

2009 ◽  
Author(s):  
Yu-Mi Kim ◽  
Joongmyeon Bae
Keyword(s):  
Cost Reduction ◽  
Operating Temperature ◽  
Metal Substrate ◽  
Solid Oxide ◽  
Half Cell ◽  
Sem Images ◽  
Mechanical Durability ◽  
Cell Test ◽  
Cell Fabrication

Metal-supported solid oxide fuel cell (SOFC) is a promising concept in solving serious problems associated with current SOFC design. Metal-supported SOFC have many advantages as compared to current SOFC such as easy sealing, mechanical durability and cost reduction. However, they have also disadvantages such as diffusion of metallic components between metal-substrate and anode, corrosion of metal at high temperatures. Due to the cell fabrication and oxidation of metal substrate, unsintered cathode with high electrochemical activity at operating temperature is essential in order to obtain the better performance in the metal-supported SOFC. For this purpose, mixed conducting cathode materials for metal-supported SOFC were investigated by using SEM, XRD, EIS and particle size distribution (PSD) measurement. From the results of half cell test using 8YSZ electrolyte and SEM images, it was observed that (Ba,Sr)(Co,Fe)O3-δ electrode showed the better electrochemical performance and sinterability at 1073 K than other conventional cathode material. It was also concluded from the long-term test that the buffer layer between electrolyte and cathode is necessary in order to eliminate the chemical reaction between the 8YSZ electrolyte and the cathode.

scholarly journals Improved Desulfurization Performance of Polyethyleneglycol Membrane by Incorporating Metal Organic Framework CuBTC

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 414 ◽  
Author(s):  
Caibin Cai ◽  
Xiaotao Fan ◽  
Xiaolong Han ◽  
Jiding Li ◽  
Harsh Vardhan
Keyword(s):  
Operating Temperature ◽  
Metal Organic Framework ◽  
Mixed Matrix Membrane ◽  
Separation Performance ◽  
Hybrid Membranes ◽  
Mixed Matrix ◽  
Metal Organic ◽  
Pervaporation Separation ◽  
Π Complexation

In this paper, copper benzene-1,3,5-tricarboxylate (CuBTC) was incorporated into polyethylenglyol (PEG) to prepare a mixed matrix membrane (MMM) for pervaporation desulfurization. The characterization results showed that the prepared CuBTC particles had an ideal octahedral shape and micropores. The Cu2+ in CuBTC interacts with thiophene via π-complexation, thus enhancing the separation performance of the hybrid membranes. The effect of CuBTC content and the operating condition on the pervaporation performance of the MMMs was investigated. An optimal pervaporation separation performance was acquired with a permeation flux of 2.21 kg/(m2·h) and an enrichment factor of 8.79, which were increased by 100% and 39% compared with the pristine PEG membrane. Moreover, the CuBTC-filled PEG membrane showed a good stability in the long-term desulfurization under a high operating temperature of 75 °C for five days.

Long-term aging effect on led circuit with fe-based amorphous current transformer

1993 ◽  
Vol 76 (7) ◽  
pp. 68-76
Author(s):  
Minoru Fukuhara ◽  
Hidenori Kakehashi ◽  
Yukihiko Ohta ◽  
Hirotoshi Fukunaga ◽  
Tamotsu Ninomiya
Keyword(s):  
Aging Effect ◽  
Current Transformer

scholarly journals Investigation of 22 kV silane cure TR-EPR cable

2020 ◽  
Vol 10 (1) ◽  
pp. 41
Author(s):  
Fernando Agustin ◽  
Akhtar Kalam ◽  
Aladin Zayegh
Keyword(s):  
Operating Temperature ◽  
Storage Condition ◽  
Cross Linking ◽  
Heating Process ◽  
Curing Process ◽  
Power Network ◽  
Cross Link ◽  
Physical Changes ◽  
Ambient Curing

EPR-insulated cables for distribution power network are not commonly used in Australia. This is due to the higher DDF of common EPR cables when compared with XLPE that contributes to the power loss and economics in transmitting electricity. This led to the development of EPR called TR-EPR with significantly lower DDF and uses silane curing process to address concerns about cost-effectiveness. The thermal behavior of low DDF silane cure TR-EPR is investigated for 30 months of exposure to the maximum operating temperature of material. The physical changes in the samples throughout the long-term aging are examined to create an opportunity to model the expected life cycle of TR-EPR cable under thermal stress. The cross-linking characteristics of TR-EPR cable are also examined by ambient curing that simulates the storage condition for unused cable and by cable heating process that simulates the condition when the cable is energized. The results are tabulated for a better understanding of the time for the material to cross-link at various conditions. The improved partial discharge values after cross-linking are also presented.

Research of Nominal Operating Temperature Testing Method of BIPV Module

2017 ◽  
Vol 726 ◽  
pp. 18-22
Author(s):  
Chen Guang Wei ◽  
Rui Na Pan ◽  
Dong Wang
Keyword(s):  
Operating Temperature ◽  
Test Methods ◽  
National Standard ◽  
Operation Condition ◽  
Testing Environment ◽  
Testing Method ◽  
Optimal Load ◽  
Building Integrated Photovoltaic ◽  
Load Resistor

There is no national standard and international standard of nominal module operating temperature (NMOT) test methods for Building Integrated Photovoltaic (BIPV) modules. An in-lab testing method for measuring NMOT of BIPV modules is proposed. Based on the real operation condition of solar cells, the effect of ambient temperature, wind speed and optimal load resistor to operate temperature was analyzed. The surface temperature, interior temperature and back temperature of BIPV module were measured and the NMOT was determined. This method was demonstrated to be valid and convenient for long-term experiments in out-door testing environment.

Development of Advanced TBC for 1650 °C Class Gas Turbine

2021 ◽  
Author(s):  
Yoshifumi Okajima ◽  
Taiji Torigoe ◽  
Masahiko Mega ◽  
Masamitsu Kuwabara ◽  
Naotoshi Okaya
Keyword(s):  
Gas Turbine ◽  
Thermal Barrier Coatings ◽  
Thermal Efficiency ◽  
Gas Turbines ◽  
Operating Temperature ◽  
Critical Role ◽  
Thermal Barrier ◽  
Barrier Coatings

Abstract Increasing operating temperature plays a critical role in improving the thermal efficiency of gas turbines. This paper assesses the capability of advanced thermal barrier coatings being developed for use in 1700 °C class gas turbines. Parts sprayed with these coatings were evaluated and found to have excellent durability and long-term reliability.

scholarly journals Finite Element Modeling of FRP-Strengthened RC Beam under Sustained Load

2018 ◽  
Vol 2018 ◽  
pp. 1-16 ◽  
Author(s):  
Shiyong Jiang ◽  
Weilai Yao ◽  
Jin Chen ◽  
Tao Cai
Keyword(s):  
Finite Element ◽  
Field Performance ◽  
Adhesive Layer ◽  
Aging Effect ◽  
Time Dependent ◽  
Sustained Load ◽  
Fe Model ◽  
Rc Beam ◽  
Long Term Behavior

External bonding of FRP laminates to the tension soffit of concrete members has become a popular method for flexural strengthening. However, the long-term field performance of FRP-strengthened RC members under service conditions is still a concern, and more work needs to be done. Based on concrete smeared-crack approach, this paper presents a finite-element (FE) model for predicting long-term behavior of FRP-strengthened RC beam, which considers the time-dependent properties of all components including the aging effect of concrete. According to the comparison between theoretical predictions and test results, the validity of the FE model is verified. The interfacial edge stresses in adhesive layer were determined through appropriate mesh refinement near the plate end, and their time-dependent characteristics were investigated. The results show that creep of concrete and epoxy resin cause significant variations of the edge stresses with time. According to the research in this paper, the FE approach is found to be able to properly simulate the long-term behavior of the FRP-strengthened beam and help us better understand the complex changes in the stress state occurring over time.

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