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射频热水联合漂烫对鲜切西兰花过氧化物酶活性的影响

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食品安全质量检测学报 2024年第13期15卷 327-336页

作者：周忠祥王湘懿仉雨晴康嘉艺黄智西北农林科技大学机械与电子工程学院杨凌712100

目的研究射频热水联合漂烫对鲜切西兰花过氧化物酶(peroxidase,POD)活性的影响。方法采用6 kW,27.12 MHz自由振荡式平行极板射频系统,对500 g不同切割尺寸(50、30和20 mm)的西兰花在不同极板间距(90、95、100、105和110 mm)和不同漂烫... 详细信息

目的研究射频热水联合漂烫对鲜切西兰花过氧化物酶(peroxidase,POD)活性的影响。方法采用6 kW,27.12 MHz自由振荡式平行极板射频系统,对500 g不同切割尺寸(50、30和20 mm)的西兰花在不同极板间距(90、95、100、105和110 mm)和不同漂烫目标温度(70、80、90℃)下进行射频加热,测定射频漂烫速率和均匀性。以愈创木酚、过氧化氢为底物,通过分光光度计法,对单独射频、单独热水、射频热水联合处理后西兰花POD相对酶活进行测定。结果西兰花射频加热后的POD相对酶活是射频加热温度和持续时间的双重作用,针对中间尺寸西兰花,与单独热水漂烫(90℃,120 s)相比,射频(70℃,59 s)和热水(90℃,10 s)联合可将漂烫时间缩短至69s,漂烫时间减少了42.5%,能量效率提高了110%。此时的最佳漂烫条件为:极板间距90 mm,西兰花尺寸30 mm,射频漂烫目标温度70℃,热水温度90℃。结论射频热水联合是一种高效、高品质的漂烫处理方法,能够有效降低西兰花中过氧化物酶活性且获得最佳的能量利用效率。

关键词：西兰花钝化射频漂烫

Research with KNbO_(3) Bulk and Surface Properties Based on Density Functional Theory

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Chinese Physics Letters 2013年第2期30卷 186-189页

作者： SUN Hong-Guo zhou zhong-xiang YUAN Cheng-Xun YANG Xiao-Niu Polymer Composites Engineering Laboratory Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022 Department of Physics Harbin Institute of TechnologyHarbin 150001

The geometrical structure optimization,band structure,density of states,and charge density contour of potassium niobate(KNbO_(3))in the bulk[100]direction and(100)surface are calculated and analyzed using density functional *** elastic constants,which can describe the bonding characteristics and structural stability,are also computed,and the dielectric function,which can be used to calculate all the other optical properties of the material,is *** density approximation functional analysis using CASTEP software is also *** similarities and differences are observed in the properties of the KNbO_(3) bulk and *** all of the calculated results for the bulk sample are twice those of the surface *** results are consistent with the experiment.

关键词： KNbO3 functional potassium

Upconversion Emission Properties of Erbium-and Ytterbium-Doped Potassium Lithium Tantalate Niobate Ceramics

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Chinese Physics Letters 2013年第12期30卷 116-119页

作者： LI Lei zhou zhong-xiang YANG Wen-Long LI Huan WU Ye Jiangsu Key Laboratory of Power Transmission and Distribution Equipment Technology Hohai UniversityChangzhou 213022 Department of Physics Harbin Institute of TechnologyHarbin 150001

We investigate the luminescence properties of erbium-doped and erbium-ytterbium-codoped potassium lithium tantalate niobate ceramics prepared by the solid phasesyntheses *** crystalline structure and surface morphology of these ceramics are tested by x-ray diffraction and scanning electron *** green,red,and near-infrared upconversion photoluminescence properties are analyzed by the steady-state spectra under 975 nm and 800 nm *** ceramics arewell sintered and tetragonal tungsten type crystalline structure with the 4 mm point group and the P4bm space *** Er3+upconversion emission integrated intensities increase with theincrease in Er3+ion concentration,while the green emissiondecreases with the increase in Yb^(3+)ion concentration under the 800 nm *** effective energy back transfer process from the Er^(3+)^(4)S_(3/2)state to Yb^(3+)ground state plays an important role in enhancing the red emission and weakening the green emission.

关键词： ceramics crystalline Potassium

Relativistic Magnetosonic Solitary Wave in Magnetized Multi-Ion Plasma

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Communications in Theoretical Physics 2009年第6期51卷 1121-1124页

作者： WANG Yun-Liang zhou zhong-xiang LU Yan-Zhen NI Xiao-Dong SHEN Jiang ZHANG Yu Department of Physics School of Applied Science University of Science and Technology Beijing Beijing 100083 China Department of Physics Harbin Institute of Technology Harbin 150001 China

In the presence of an applied uniform magnetic field Bo, the properties of 2-dimensional （2D） magnetosonic solitary waves of relativistic amplitude in the plasma containing electron, light ions He^＋, and heavy ions O＋ are presented. In the weakly relativistic limit, a Kadomtsev Petviashvili （KP） equation is derived by reductive perturbation method. We give the N-soliton solution of the KP equation and find dromion solutions of a potential of the physical field. The interaction law of the dromions is obtained, which shows there is no exchange of energy, momentum, and angular momentum before and after interaction of the dromions except for phase shifts.

关键词： magnetosonic solitary wave magnetized plasma weakly relativistic

Structural, Electronic and Optical Properties of KTa_(0.5)Nb_(0.5)O_(3) Surface: A First-Principles Study

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Chinese Physics Letters 2012年第1期29卷 227-230页

作者： SUN Hong-Guo zhou zhong-xiang YUAN Cheng-Xun YANG Wen-Long WANG He Department of Physics Harbin Institute of TechnologyHarbin 150001 College of Pharmacy Heilongjiang University of Chinese MedicineHarbin 150040

The crystal surface properties of potassium tantalite niobate,KTa_(0.5)Nb_(0.5)O_(3) (KTN),are studied with firstprinciples calculation based on the density functional theory (DFT).Generalized gradient approximation (GGA) functional analysis is also employed by using CASTEP *** explanations for the differences of the ferroelectric and piezoelectric properties between the bulk and surface of the material are *** DFT with GGA is used to determine the structure and to calculate the electronic and optical properties of the chemically ordered KTa_(0.5)Nb_(0.5)O_(3) crystal (100),(110) and (111) *** results show that the surface properties are different from the bulk *** data obtained agree with the expected values and can serve as guidance for future experimental studies in the fields of photorefraction and nonlinear optics.

关键词： properties. crystal piezoelectric

Two-dimensional Perturbative Analysis of Slant Grating in Photorefractive Crystals in an External Electric Field

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Chinese Physics Letters 1998年第6期15卷 423-425页

作者： JIANG Yong-yuan FENG Yu-wen zhou zhong-xiang LI Yan SUN Xiu-dong XU Ke-bin Department of Applied Physics Harbin Institute of TechnologyHarbin 150001

A slant grating was recorded with two laser beams incident on photorefractive crystal in an external dc electric ***-dimensional perturbative analytical solution for the first two-order space-charge field for steady-state photorefractive slant grating recording has been *** is shown that the inclusion of the longitudinal component of the space-charge field during photorefractive two-wave coupling can predict reduction of the fundamental harmonic and enhancement or reduction of the second-order harmonic for various applied field strength and various grating slant *** dependence of the first two-order harmonics on the slant angle and on the applied field strength is examined.

关键词： Photorefractive Crystal harmonic

The Relationship between Father-Love Absence and Loneliness:Based on the Perspective of the Social Functionalist Theory and the Social Needs Theory

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International Journal of Mental Health Promotion 2024年第2期26卷 139-148页

作者： Yaping zhou He zhong Xiaojun Li Yanhui xiang Moral Culture Research Center of Hunan Normal University Hunan Normal UniversityChangsha410081China Research Center for Mental Health Education of Hunan Province Changsha410081China Beijing Huijia Private School Beijing102200China Tao Xingzhi Research Institute Nanjing Xiao Zhuang UniversityNanjing211171China Cognition and Human Behavior Key Laboratory of Hunan Province Hunan Normal UniversityChangsha410081China

Fathers play an important role in adolescents’development,which is significant for their development and influences their mental health,including feeling of ***,the effects and mechanisms of father-love absence on individual loneliness are not *** on the social functionalist theory and the social needs theory,this study examines the influence of individual fatherlove absence on loneliness and its underlying mechanisms.A questionnaire survey was administered to 319 junior high school students and 1,476 high school *** results showed that adolescents with father-love absence had higher levels of loneliness,and that father-love absence affected loneliness levels through mediating pathways of individual gratitude,peer relationships,and gratitude to peer *** study not only confirms the negative effects of father-love absence on adolescents’loneliness,but also explains the mediate roles of individual gratitude and peer *** enriches the theoretical system related to family education and has important theoretical and practical implications for further interventions on adolescents’mental health from the perspective of fatherless parenting.

关键词： Father-love absence loneliness gratitude peer relationships

Multiple Soliton Asymptotics in a Spin-1 Bose–Einstein Condensate

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Chinese Physics Letters 2024年第9期41卷 15-22页

作者： zhong-zhou Lan School of Computer Information Management Inner Mongolia University of Finance and EconomicsHohhot 010070China

Spinor Bose–Einstein condensates(BECs)are formed when atoms in the multi-component BECs possess single hyperfine spin states but retain internal spin degrees of *** study concentrates on a(1+1)-dimensional three-couple Gross–Pitaevskii system to depict the macroscopic spinor BEC waves within the meanfield *** the distribution of the atoms corresponding to the three vertical spin projections,a known binary Darboux transformation is utilized to derive the𝑁matter-wave soliton solutions and triple-pole matter-wave soliton solutions on the zero background,where𝑁is a positive *** those multiple matterwave solitons,the asymptotic analysis is performed to obtain the algebraic expressions of the soliton components in the𝑁matter-wave solitons and triple-pole matter-wave *** asymptotic results indicate that the matter-wave solitons in the spinor BECs possess the property of maintaining their energy content and coherence during the propagation and ***,in the𝑁matter-wave solitons,each soliton component contributes to the phase shifts of the other soliton components;and in the triple-pole matter-wave solitons,stable attractive forces exist between the different matter-wave soliton *** multiple matter-wave solitons are graphically illustrated through three-dimensional plots,density plot and contour plot,which are consistent with the asymptotic analysis *** present analysis may provide the explanations for the complex natural mechanisms of the matter waves in the spinor BECs,and may have potential applications in designs of atom lasers,atom interferometry and coherent atom transport.

关键词： soliton solitons asymptotic

Nitrogen-doped titanium dioxide/schwertmannite nanocomposites as heterogeneous photo-Fenton catalysts with enhanced efficiency for the degradation of bisphenol A

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Journal of Environmental Sciences 2024年第9期143卷 1-11页

作者： Xing-Xing Qiao Yu-Hang Xu xiang-Ji Liu Sai-Le Chen zhou zhong Ya-Feng Li Jian Lü Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation College of Resources and EnvironmentFujian Agriculture and Forestry UniversityFuzhou 350002China State Key Laboratory of Photocatalysis on Energy and Environment Fuzhou UniversityFuzhou 350116China

Potential health risks related to environmental endocrine disruptors(EEDs)have aroused research hotspots at the forefront of water treatment ***,nitrogen-doped titanium dioxide/schwertmannite nanocomposites(N-TiO_(2)/SCH)have been successfully developed as heterogeneous catalysts for the degradation of typical EEDs via photo-Fenton *** to the sustainable Fe(Ⅲ)/Fe(Ⅱ)conversion induced by photoelectrons,as-prepared N-TiO_(2)/SCH nanocomposites exhibit much enhanced efficiency for the degradation of bisphenol A(BPA;ca.100% within 60 min under visible irradiation)in a wide pH range of 3.0-7.8,which is significantly higher than that of the pristine schwertmannite(ca.74.5%)or N-TiO_(2)(ca.10.8%).In this photo-Fenton system,the efficient degradation of BPA is mainly attributed to the oxidation by hydroxyl radical(·OH)and singlet oxygen(^(1)O_(2)).Moreover,the possible catalytic mechanisms and reaction pathway of BPA degradation are systematically investigated based on analytical and photoelectrochemical *** work not only provides a feasible means for the development of novel heterogeneous photo-Fenton catalysts,but also lays a theoretical foundation for the potential application of mineral-based materials in wastewater treatment.

关键词： Titanium dioxide Schwertmannite Fenton reaction Environmental endocrine disruptors Photocatalysis