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- 저자 : Hengheng Zhang (검색결과 2 건)
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Hengheng Qiu,Xin Guo,Xiaorong Deng,Xiaobing Guo,Xiaoying Mao,Chengjian Xu,Jian Zhang 한국식품과학회 2020 Food Science and Biotechnology Vol.29 No.10
The purpose of this study was to investigate theendogenous cathepsin activity in each subcellular fractionand the effect of this activity on myofibrillar protein andtexture during refrigeration and partial freezing storage ofnorthern pike (Esox lucius) fillets. The results showed thatfillets stored under the refrigerated condition were moresusceptible to oxidation than partial freezing. Endogenouscathepsin activity indicated that partial freezing destroysthe integrity of lysosomes more effectively than refrigerationand inhibits the increase in cathepsin B and B ? L inlysosomes. The activity of cathepsin B and B ? L inlysosomes, mitochondria and myofibrils under the partialfreezing conditions was always lower than that underrefrigeration. Texture analysis showed that refrigerationhad a negative impact on hardness and springiness. Inconclusion, the cathepsin activity in each subcellularfraction was effectively inhibited and better textural characteristicswere obtained with partial freezing thanrefrigeration.
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Detection of Water Cloud Microphysical Properties Using Multi-scattering Polarization Lidar
Jiaming Xie,Xingyou Huang,Lingbing Bu,Hengheng Zhang,Farhan Mustafa,Chenxi Chu 한국광학회 2020 Current Optics and Photonics Vol.4 No.3
Multiscattering occurs when a laser transmits into dense atmosphere targets (e.g. fogs, smoke or clouds), which can cause depolarization effects even though the scattering particles are spherical. In addition, multiscattering effects have additional information about microphysical properties of scatterers. Thus, multiscattering can be utilized to study the microphysical properties of the liquid water cloud. In this paper, a Monte Carlo method was used to simulate multi-scattering transmission properties of Lidar signals in the cloud. The results showed the slope of the degree of linear polarization (SLDLP) can be used to invert the extinction coefficient, and then the cloud effective size (CES) and the liquid water content (LWC) may be easily obtained by using the extinction coefficient and saturation of the degree of linear polarization (SADLP). Based on calculation results, a microphysical properties inversion method for a liquid cloud was presented. An innovative multiscattering polarization Lidar (MSPL) system was constructed to measure the LWC and CES of the liquid cloud, and a new method based on the polarization splitting ratio of the Polarization Beam Splitter (PBS) was developed to calibrate the polarization channels of MSPL. By analyzing the typical observation data of MSPL observation in the northern suburbs of Nanjing, China, the LWC and CES of the liquid water cloud were obtained. Comparisons between the results from the MSPL, MODIS and the Microwave radar data showed that, the microphysical properties of liquid cloud could be retrieved by combining our MSPL and the inversion method.
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