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Monitoring and identification of spoilage-related microorganisms in braised chicken with modified atmosphere packaging during refrigerated storage 被引量:2
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作者 Yang Lei Yali Zhang +2 位作者 Yiqun Cheng jichao huang Ming huang 《Food Science and Human Wellness》 SCIE CSCD 2023年第1期28-34,共7页
This study mainly monitored the dominant bacterial populations and identified the spoilage-related microorganisms of braised chicken meat stored under different CO_(2)-modified atmosphere packaging(MAP)during refriger... This study mainly monitored the dominant bacterial populations and identified the spoilage-related microorganisms of braised chicken meat stored under different CO_(2)-modified atmosphere packaging(MAP)during refrigerated storage using a culture-dependent method and 16S rDNA identification.The quality changes and shelf life of the meat were also measured.The growth rate of total viable count(TVC)in braised chicken was slower with an increase of CO_(2) content in MAP,which also occurred in the remaining bacterial species monitored(lactic acid bacteria,Pseudomonas spp.,Brochothrix thermosphacta).The MAP exerted beneficial effects on the quality of braised chicken,as demonstrated by retarding the production of total volatile basic nitrogen(TVB-N)and delaying lipid oxidation(TBARS test).A total of 14 isolates were identified from braised chickens with different packaging at the end of storage,these included P.fragi(6 isolates),P.psychrophila(2 isolates),Enterococcus faecalis(3 isolates),B.thermosphacta(2 isolates),Staphylococcus equorum(1 isolate). 展开更多
关键词 Braised chicken Modified atmosphere packaging(MAP) 16S rDNA identification Shelf-life
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In-package cold plasma treatment of braised chicken: voltage effect 被引量:4
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作者 Yali Zhang Yang Lei +3 位作者 Suhong huang Xiaoli Dong jichao huang Ming huang 《Food Science and Human Wellness》 SCIE 2022年第4期845-853,共9页
This study investigated the effect of different dielectric barrier discharge cold plasma(DBD-CP) treatment voltages on the microbiological growth and quality characteristics of braised chicken during storage at(4 ... This study investigated the effect of different dielectric barrier discharge cold plasma(DBD-CP) treatment voltages on the microbiological growth and quality characteristics of braised chicken during storage at(4 ± 1) ℃. Argon-packed samples were subjected to DBD-CP treatment for 3 min at voltages of 50, 60 and 70 k V. As a result, there was no significant(P > 0.05) difference in L*, a*, b* and p H of braised chicken between control and treatment groups at the same storage time. However, the development of lipid oxidation in DBD-CP treatment samples was slower than that in air-packed samples. Compared to air-packed samples, the reduction of total viable count, yeasts and molds, lactic acid bacteria and Pseudomonads spp. in 70 k V treated samples on day 15 were 3.21, 2.41, 2.44 and 1.96 lg(CFU/g), respectively. The results indicate that DBD-CP treatment could extend the shelf life of braised chicken without negative impacts on quality characteristics. 展开更多
关键词 In-package cold plasma Braised chicken Shelf-life QUALITY
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Co-seismic fault geometry and slip distribution of the 26 December 2004, giant Sumatra–Andaman earthquake constrained by GPS, coral reef, and remote sensing data 被引量:1
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作者 Yongge Wan Zheng-kang Shen +5 位作者 Min Wang Yuehua Zeng jichao huang Xiang Li Huawei Cui Xiwei Gao 《Earthquake Science》 CSCD 2015年第3期187-195,共9页
We analyze co-seismic displacement field of the 26 December 2004, giant Sumatra–Andaman earthquake derived from Global Position System observations,geological vertical measurement of coral head, and pivot line observ... We analyze co-seismic displacement field of the 26 December 2004, giant Sumatra–Andaman earthquake derived from Global Position System observations,geological vertical measurement of coral head, and pivot line observed through remote sensing. Using the co-seismic displacement field and AK135 spherical layered Earth model, we invert co-seismic slip distribution along the seismic fault. We also search the best fault geometry model to fit the observed data. Assuming that the dip angle linearly increases in downward direction, the postfit residual variation of the inversed geometry model with dip angles linearly changing along fault strike are plotted. The geometry model with local minimum misfits is the one with dip angle linearly increasing along strike from 4.3oin top southernmost patch to 4.5oin top northernmost path and dip angle linearly increased. By using the fault shape and geodetic co-seismic data, we estimate the slip distribution on the curved fault. Our result shows that the earthquake ruptured *200-km width down to a depth of about 60 km.0.5–12.5 m of thrust slip is resolved with the largest slip centered around the central section of the rupture zone78N–108N in latitude. The estimated seismic moment is8.2 9 1022 N m, which is larger than estimation from the centroid moment magnitude(4.0 9 1022 N m), and smaller than estimation from normal-mode oscillation data modeling(1.0 9 1023 N m). 展开更多
关键词 Sumatra–Andaman earthquake Fault geometry Co-seismic slip distribution Geodetic data
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基于震源机制解数据反演构造应力张量的网格搜索法及其在中国、越南和老挝边界地区的应用
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作者 Yongge Wan Shuzhong Sheng +3 位作者 jichao huang Xiang Li Xin Chen 杨帆 《世界地震译丛》 2017年第2期169-184,共16页
应力场在地球动力学研究方面起着至关重要的作用。本研究给出了由震源机制解数据反演应力张量及其置信范围的网格搜索法。我们使用人工合成震源机制解数据对该算法进行了测试,人工合成的震源机制解数据由拉张型、挤压型和走滑型3种类型... 应力场在地球动力学研究方面起着至关重要的作用。本研究给出了由震源机制解数据反演应力张量及其置信范围的网格搜索法。我们使用人工合成震源机制解数据对该算法进行了测试,人工合成的震源机制解数据由拉张型、挤压型和走滑型3种类型应力场生成,并对生成的震源机制解数据添加不同水平的噪声。测试结果表明,相对于传统方法,本研究给出的方法反演出的应力场精度得到显著提高。本文算法主要有以下3个优点:(1)由精细的网格搜索获得应力张量的全局最优解,搜索网格为1°×1°×1°×0.01,避免了搜索结果落入局部最小值;(2)在反演应力张量的过程中,本方法可以考虑震源机制解数据精度的不同,并赋予不同的权重;(3)由F检验给出应力张量结果的置信范围。我们将该方法应用于中国、越南和老挝的边界地区,获得该地区应力场的主压应力方向为SSE—NNW,主张应力方向为NEE—SWW。应力比R为0.6,这意味着应力张量的特征值接近等差数列。该地区应力场与奠边—琅勃拉邦弧形断裂的左旋走滑性质一致,所得结果对该地区的地质动力学过程研究有一定的帮助。 展开更多
关键词 应力张量 网格搜索 震源机制 不确定性
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High-efficiency Multiplexed Buck-type PFC Converter
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作者 Lunquan Li Qianhong Chen +1 位作者 jichao huang Bin Liu 《CSEE Journal of Power and Energy Systems》 SCIE EI CSCD 2024年第3期1053-1063,共11页
This paper proposes a high-efficiency PFC rectifier based on multiplexing the switches.Compared with a traditional six-switch PFC rectifier,the proposed rectifier extends the switches’active angle by making use of th... This paper proposes a high-efficiency PFC rectifier based on multiplexing the switches.Compared with a traditional six-switch PFC rectifier,the proposed rectifier extends the switches’active angle by making use of three bridge rectifiers.As a result,lower conduction resistance can be realized for switches.Consequently,system efficiency can be improved.Compared with a traditional six-switch PFC rectifier with doubled switches,the proposed rectifier can achieve almost the same efficiency improvement while no additional switches are needed.Since continuous inductor current is chopped and resulting current pulses cannot be injected into the grid directly,input filter design and resonance damping are discussed for the proposed rectifier.The controller design of the rectifier is analyzed.The inductor current reference is shaped considering the input voltage envelope and forward duties.Finally,the effectiveness of the proposed rectifier is verified through simulations and experiments. 展开更多
关键词 Buck-type rectifier commutation state controller design efficiency multiplex
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The Grid Search Algorithm of Tectonic Stress Tensor Based on Focal Mechanism Data and Its Application in the Boundary Zone of China, Vietnam and Laos 被引量:60
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作者 Yongge Wan Shuzhong Sheng +2 位作者 jichao huang Xiang Li Xin Chen 《Journal of Earth Science》 SCIE CAS CSCD 2016年第5期777-785,共9页
Stress field plays a key role in geodynamics. In this study, an algorithm to determine the stress tensor and its confidence range from focal mechanism data by using grid search method was proposed. The experiment uses... Stress field plays a key role in geodynamics. In this study, an algorithm to determine the stress tensor and its confidence range from focal mechanism data by using grid search method was proposed. The experiment uses artificial focal mechanism data which were generated by extensional, compression and strike-slip stress regime and different level of noise, shows that the precision of the estimated stress tensor based on this algorithm is greatly improved compared with traditional algorithms. This algorithm has three advantages:(1) The global optimal solution of the stress tensor is determined by fine grid search of 1o×1o×1o×0.01 and local minimum value is avoided; (2) precision of focal mechanism data can be considered, i.e., different weight of the focal mechanism data contributes differently to the process of determining stress tensor; (3) the confidence range of the determined stress tensor can be obtained by using F-test. We apply this algorithm in the boundary zone of China, Vietnam and Laos, and obtain the stress field with SSE-NNW compressive stress direction and NEE-SWW extensional stress direction. The stress ratio is 0.6, which shows that the eigen values of the stress tensor are nearly in arithmetic sequence. The stress field in this region is consistent with the left-lateral strike slip of the Dienbien-Lauangphrabang arc fault. The result will be helpful in studying the geological dynamic process in this region. 展开更多
关键词 stress tensor grid search focal mechanism uncertainty.
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