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This paper is focused on studying a 1200V SiC JFETs cascode device released recently. The gate drive circuit design and switching performance are compared with its counterpart, 1200 V SiC MOSFETs. The research finds out the gate drive circuit design of SiC JFETs cascode is similar to that of SiC MOSFETs. In addition, an optimized gate driver is designed to minimize the device switching loss without...
We report the effects of multiple reflow cycles on the reliability of Sn-Sb solders. Reflow soldering technology was used to prepare the Sn-Sb joints after 1 reflow cycle, 2 reflow cycles and 3 reflow cycles. We found that the intermetallic compound layers became thicker and denser with the reflow cycle increased. And the samples here had good bonding quality with only a few voids. After 600 thermal...
Failing to identify multi-word expression (MWE) may cause serious problems for many Natural Language Processing (NLP) tasks. Previous approaches heavily depend on language specific knowledge and pre-existing natural language processing (NLP) tools. However, many languages (including Chinese language) have less such resources and tools compared to English. An automatically learn effective features...
A simple and sensitive technique, headspace solid-phase microextraction (HS-SPME) linked to gas chromatography-mass spectrometry (GC-MS), was developed for the determination of musty odor compounds, geosmin and 2-methylisoborneol. To obtain the highest sensitivity, several parameters of the extraction and desorption procedure were studied and optimized (such as extraction temperature, extraction time,...
An analytical methodology using Thermal Desorption (TD) and GC-MS was developed for the determination of components in coffee beans aromas. The purpose was to estimate the volatile compounds/components in coffee beans aromas of different roast levels, such as light, medium, medium-dark, and dark roast. Aromas samples were collected by using stainless steel tubes containing approximately 200 mg of...
With introduction of information granularity in decision systems in this paper, the importance of core attributes and information granularity is analyzed. Besides, an effective compound attribute measure is defined, which not only considers the measures of certain information in the positive region, but also considers the importance of information granularity beyond the positive region. Based on the...
A new unsymmetrical photochromic diarylethene, 1-(2-ethyl-3-benzofuranyl)-2-(3,5-dimethyl-4-isoxazolyl)perfluo -rocyclopentene(1a)were synthesized, and its properties, such as photochromism and fluorescence properties in solution as well as in poly-methylmethacrylate (PMMA) amorphous films, were investigated in detail. The results showed that this compound had good thermal stability and exhibited...
A new photochromic diarylethene bearing five and six-membered moieties 1-(2, 5-dimethyl-3-thienyl)-2-(2-methylphenyl)perfluorocyclopentene has been synthesized. The compound underwent reversible cyclization and cycloreversion reactions, changing from colorless to red upon alternating irradiation with UV and visible light both in solution and in PMMA film. The diarylethene 1o also showed good fluorescent...
A new unsymmetrical photochromic diarylethene bearing an isoxazole moiety was synthesized and its photochromic and fluorescent properties were also investigated. The compounds exhibited remarkable photochromism both in solution and in PMMA film. In PMMA film, the open-ring isomer of the diarylethene 1 exhibited relatively strong fluorescence at 405 nm when excited at 310 nm. The fluorescence intensity...
Finding the longest cycle is a novel concept in biochemical feedback loop analysis in systems biology. Biochemical networks are often represented as directed graphs in which vertices represent chemical compounds and edges represent chemical reactions between compounds. Therefore, a biochemical longest feedback loop can be formulated as the longest cycle in a directed graph. Because finding the longest...
The acaricidal activities of root extracts from the of Tateges erecta against T. viennensis were determined under illumination and non-illumination conditions. Furthermore, the effects of chloroform extract on several enzymes activities of T. viennensis were also evaluated. According to the F-test statistical analysis, the chloroform extract had acaricidal activities against T. viennensis under non-illumination...
Few studies reported the antifeedant activity of Stellera chamejasme extracts against larvae of Plutella xylostella. Here, laboratory choice and no-choice test feeding studies were conducted to assess the antifeedant activity of methanol extracts of S. chamejasme against larvae of P. xylostella. S. chamejasme Extracts caused severe feeding deterrence by 2nd or 3rd instars larvae of P. xylostella in...
A photochromic diarylethene bearing a six-membered aryl unit 1-[(2-methyl-5-(3-chlorophenyl) -3-thienyl)]-2-[(2methoxylphenyl)]perfluorocyclopentene (la) was synthesized and its photochromic and fluorescent properties were also investigated in detail. The results showed that this compound exhibited reversible photochromism, changing from colorless to blue after irradiation with UV light both in solution...
A novel symmetrical photochromic diarylethene, 1,2-bis[2-methyl-5-(p-chlorophenyl)-3-thienyl]perfluorocyclop- entene (1a), has been synthesized. Its photochromic properties in solution and PMMA film were investigated. While, fluorescence properties in different solution have also been discussed. The results of the research demonstrated that it has shown good photochromic behavior and relatively strong...
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