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Steel scale-CaO composite catalyst for coke combustion and in-situ NO and SO2 removal
Li Zhang,Jingchong Yan,Zhiping Lei,Xianzhong Cao,Tiejun Chun,Zhanku Li,Hengfu Shui,Shibiao Ren,Zhicai Wang,Ying Kong 한국공업화학회 2022 Journal of Industrial and Engineering Chemistry Vol.110 No.-
The performance of the steel scale (SS)-CaO composite on the combustion of coke nuts and in-situ reductionof SO2 and NO emission was investigated. Combustion experiments show that SS-CaO compositeaccelerates coke combustion and reduces SO2 and NO emissions concurrently. X-ray diffraction (XRD),scanning electron microscopy (SEM), and electron spin resonance (ESR) were used to investigate thecatalysis mechanism. Results show that SS and CaO have synergistic effect in in-situ denitration. Theincrease of SS and CaO fraction in the composites improve the denitration and sulfur fixation performance,respectively. The denitration activity is mainly attributed to the Fe2O3 in SS and Ca2Fe2O5 formedduring combustion. The desulfurization is due to the sulfur fixation with CaO. The increasing fraction ofCaO in the composites leads to the agglomeration of ash particles. 2%CaO is confirmed as the optimumaddition for catalytic combustion and emission reduction. This work sheds light on the cheap and effectivecatalysts that are potentially useful for iron ore sintering.
The enhanced electrical transport properties of Fe3+ doped Cu2SnS3
Lei Cao,Xueli Du,Xiaohui Guo,Zhihao Yuan 대한금속·재료학회 2021 ELECTRONIC MATERIALS LETTERS Vol.17 No.6
Cu 2 SnS 3 has attracted much attention as a promising environmental-friendly thermoelectric material. In this work, theFe 3+ doped Cu 2 Sn 1- x Fe x S 3 ( x = 0–0.2) compounds were prepared by a facile route of solvothermal synthesis and microwavesintering. Due to the shallow impurity energy level and additional energy states introduced by the d-unfi lled electrons inthe valence band, Fe 3+ doping eff ectively enhanced the electrical transport properties of Cu 2 SnS 3 , and the ultra-high powerfactor of 1.11 mWK −2 m −1 at 700 K is obtained from Cu 2 Sn 0.85 Fe 0.15 S 3 . Although the smaller grain size and the residualpores of the samples prepared by hydrothermal synthesis and microwave sintering effi ciently inhibited the increase of thelattice thermal conductivity, the improvement of electrical transport leads to the increase of electronic thermal conductivityand total thermal conductivity. Therefore, the fi nal result is not satisfactory, and the maximum ZT value is only 0.63, whichis obtained from Cu 2 Sn 0.85 Fe 0.15 S 3 at 700 K.
Design and Simulation of a Pseudo Planar Dual-Color Photodetector Based on the PIN Photodiodes
Lei Cao,Ying Hou,Li Zhang 한국전기전자재료학회 2021 Transactions on Electrical and Electronic Material Vol.22 No.6
In this paper, design and simulation of a pseudo planar dual-color photodetector is demonstrated in detail using Atlas Silvaco software. The theoretical results are presented for a dual-color detector that simultaneously detects visible radiation in the 320–670 nm and NIR radiation in the 600–950 nm regions. There is no electrical crosstalk and a few percent spectral crosstalk. The architecture of the device is made up of the In 0.51 Ga 49 P and GaAs PIN photodiodes, similar to those made in traditional process, but on the different layers of the junctions. One PIN photodiode is on the surface of the device, the other is located on the neighbor bottom hole. The detector having separate Visible- and NIR-active regions with three contacts allows the separation of the Visible and NIR generated photocurrent components. That makes the detector identify the relative strength of each component from the whole photocurrent. Because of the three contacts (one common contact for both active regions), there is a true simultaneous detection and each PIN photodiode of this device is addressable.
Cao Zhou,Lei-lei Liu,Hong Yang,Zhao Wang,Gui-yun Long,Dao-chao Jin 한국응용곤충학회 2017 Journal of Asia-Pacific Entomology Vol.20 No.3
Sogatella furcifera (Horváth) (white-backed planthopper, WBPH) is one of the most important pests on rice in Asia. It seriously impacts rice production by sucking phloem from the rice plant and transmitting southern rice black-streaked dwarf virus (SRBSDV). In the current study, we examined the sublethal effects of imidacloprid on the development, reproduction, and susceptibility of S. furcifera in the laboratory using the rice stem dipping method. The results showed that exposure of third-instar S. furcifera nymphs to sublethal concentrations (LC10 and LC25) of imidacloprid inhibited the rate of nymphal development in the F0 and F1 generations, and there was a significant difference between the LC25 treated group and the control group. The fecundity (eggs per female) of the F1 generation showed significant declines of 22.05% and 38.56% following exposure to LC10 and LC25, respectively compared with the control group. Emergence rate, copulation rate, and hatchability were significantly lower in the LC25-treated group. The relative fitness of S. furcifera treated with LC10 and LC25 imidacloprid was 0.46 and 0.22, respectively. These results showed that exposure to imidacloprid impacted the next generation of S. furcifera, thus affecting the population growth of this species. After third-instar S. furcifera nymphs were exposed to sublethal concentrations of imidacloprid LC10 and LC25, S. furcifera showed reduced susceptibility to treatment with thiamethoxam and buprofezin. Although the susceptibility of S. furcifera to chlorpyrifos was decreased after the exposure of third-instar nymphs to imidacloprid LC25, S. furcifera populations that had been exposed to imidacloprid LC10 showed enhanced susceptibility to chlorpyrifos. These results provided a reference point for the application of insecticides to control S. furcifera.
Lei Cao,정승진,신중호 한국식품과학회 2023 Food Science and Biotechnology Vol.32 No.2
Alginate microparticles fabricated via calcium gelation or layer-by-layer assembly are commonly used for encapsulating emulsions. In this study, the impact of these two gelation methods on the lipid digestibility of emulsions was reviewed through a systematic screening of relevant studies. From the literature search (Scopus, PubMed, and Web of Science databases), 604 records were screened and 25 articles were included in the analysis. The fold change of free fatty acid release rate at the end of in vitro digestion process between alginate-encapsulated emulsion and emulsions not encapsulated by alginate was calculated for calcium gelation (weighted mean of response ratio 0.64, 95% CI 0.54–0.75) and layer-by-layer assembly (weighted mean of response ratio 0.89, 95% CI 0.81–0.98). Alginate–calcium hydrogels showed stronger inhibition of the extent of lipid digestion than alginate-coated multilayer emulsions. The structural and particle size differences between alginate microparticles acquired using different techniques may contribute to this phenomenon.
A Trellis-based Technique for Blind Channel Estimation and Equalization
Cao, Lei,Chen, Chang-Wen,Orlik, Philip,Zhang, Jinyun,Gu, Daqing The Korea Institute of Information and Commucation 2004 Journal of communications and networks Vol.6 No.1
In this paper, we present a trellis-based blind channel estimation and equalization technique coupling two kinds of adaptive Viterbi algorithms. First, the initial blind channel estimation is accomplished by incorporating the list parallel Viterbi algorithm with the least mean square (LMS) updating approach. In this operation, multiple trellis mappings are preserved simultaneously and ranked in terms of path metrics. Equivalently, multiple channel estimates are maintained and updated once a single symbol is received. Second, the best channel estimate from the above operation will be adopted to set up the whole trellis. The conventional adaptive Viterbi algorithm is then applied to detect the signal and further update the channel estimate alternately. A small delay is introduced for the symbol detection and the decision feedback to smooth the noise impact. An automatic switch between the above two operations is also proposed by exploiting the evolution of path metrics and the linear constraint inherent in the trellis mapping. Simulation has shown an overall excellent performance of the proposed scheme in terms of mean square error (MSE) for channel estimation, robustness to the initial channel guess, computational complexity, and channel equalization.
Cao, Shi-Lei,Chen, En,Zhang, Qi-Zhi,Jiang, Xin-Guo 대한약학회 2007 Archives of Pharmacal Research Vol.30 No.8
The purpose of this study was to develop a nasal in situ gel system for Radix Bupleuri employing gellan gum as a polymer. Radix Bupleuri in situ gel containing 0.2 mL essential oil extracted from 450 g Radix Bupleuri, proper solubilizing agents and gellan gum (0.5% w/v) was prepared and characterized. The antipyretic effect produced by in situ gel formulation was investigated in fevered rabbits and compared to an intranasal solution. The resulting in situ gel was a clear and light-yellow liquid, with viscosity of 346 $mPa{\cdot}s$ and caproic acid content of $1.31{\pm}$ 0.01 mg/mL. Intranasal administration of this preparation to fevered rabbits decreased body temperature markedly ($1.1^{\circ}C$ at the doses of oil from 1.5 g Bupleuri/body) and the effect could last for 20-30 h. The results suggest that Radix Bupleuri in situ gel can be greater effective than the solution in the treatment of fever.