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雪茄烟叶发酵及其与风味形成关系研究进展

中国酿造 2024年第6期43卷 27-31页

作者：钟仙韵叶为民陈群明李淮源邓世媛陈建军王媛媛王晓园华南农业大学烟草研究室广东广州510642 广东中烟工业有限责任公司广东广州510610 广东中烟工业有限责任公司湛江卷烟厂广东湛江524033

发酵作为形成烟叶风味特色的重要工序,烟叶表面伴随着活跃的微生物活动,各物质进一步降解转化形成与风味相关的香气物质。该文概述了雪茄烟叶风味评价体系、国内外雪茄烟叶的风味特征、雪茄烟叶风味物质基础及发酵过程中风味物质的变化... 详细信息

发酵作为形成烟叶风味特色的重要工序,烟叶表面伴随着活跃的微生物活动,各物质进一步降解转化形成与风味相关的香气物质。该文概述了雪茄烟叶风味评价体系、国内外雪茄烟叶的风味特征、雪茄烟叶风味物质基础及发酵过程中风味物质的变化,总结了雪茄烟叶发酵中微生物菌群、酶活对雪茄烟叶风味形成的影响,阐述了通过人工发酵技术(外源物料、外源菌剂、外源酶制剂及物理调控)提升雪茄烟叶风味品质的方法,并展望了雪茄烟叶风味研究技术发展方向,对实现定向调节国产雪茄烟叶的风味品质具有重要意义。

关键词：雪茄烟叶发酵挥发性风味成分微生物菌群人工发酵工艺

化肥减量配施有机肥对植烟土壤理化特性和微生物群落结构的影响

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华北农学报 2024年第3期39卷 146-158页

作者：孙子隽钟国兴张少搏杨欣彭金良郭维梁耀星李淮源白云峰陈建军邓世媛华南农业大学烟草研究室广东广州510642 湖南省烟草公司衡阳市公司湖南衡阳421000 广东中烟工业有限责任公司广东广州510610 华南农业大学基础实验与实践训练中心广东广州510642

探究化肥减量配施有机肥对植烟土壤理化性质和微生物群落结构的影响,为烟草生产上肥料减量和有机肥的合理施用提供理论参考。以常规施肥不配施有机肥为对照(CK),采用Illumina高通量测序技术,结合生物信息学,分析化肥减量10%(T1)、化肥减... 详细信息

探究化肥减量配施有机肥对植烟土壤理化性质和微生物群落结构的影响,为烟草生产上肥料减量和有机肥的合理施用提供理论参考。以常规施肥不配施有机肥为对照(CK),采用Illumina高通量测序技术,结合生物信息学,分析化肥减量10%(T1)、化肥减量10%+芝麻饼肥(T2)、化肥减量10%+腐殖酸肥(T3)、化肥减量10%+芝麻饼肥+腐殖酸肥(T4)等不同处理下土壤理化性质和微生物群落结构的变化特征。结果表明,与CK相比,T1处理的植烟土壤养分含量和土壤酶活性均下降、土壤物理特性略有改善,配施有机肥使土壤养分和物理特性得到进一步改善,容重降低、含水率和孔隙度增加,T2和T4处理的有效磷、速效钾含量显著高于CK和T1处理,所有配施有机肥处理的土壤酶活性均显著增加。配施有机肥增加了植烟土壤中的细菌和真菌门类,其中优势细菌门类均为变形菌门和放线菌门,其次是厚壁菌门、拟杆菌门、绿弯菌门、酸杆菌门,优势真菌门类为子囊菌门、子囊菌门盘菌亚门、被孢霉门、绿藻门、纤毛虫门、担子菌门。Alpha多样性指数表明,化肥减量降低了微生物群落的丰富度,但配施有机肥处理增加了细菌和真菌群落多样性指数,其中细菌群落丰富度提高更明显。RDA分析表明,影响土壤微生物群落结构与多样性的重要土壤理化因子包括有机质、速效钾、碱解氮、有效磷和土壤物理特性等,相对而言土壤理化因子对细菌群落结构的影响更大。综上,化肥减量配施有机肥对土壤养分、物理特性、土壤酶活性及微生物群结构有显著改善效果,尤其以同时配施芝麻饼肥和腐殖酸肥处理的效果更佳。

关键词：烟草化肥减量有机肥植烟土壤理化特性微生物群落结构

Oriented mesoporous nanofibers show nature's wisdom

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National Science Review 2024年第6期11卷 90-91页

作者： Yonghui deng Department of Chemistry State Key Laboratory of Molecular Engineering of Polymers Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Collaborative Innovation Center of Chemistry for Energy Material (iChEM) Fudan University State Key Lab of Transducer Technology Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences

Electrodes assembled with conventional nanoparticulate materials in electrochemical energy devices usually have a random and torturous porous system. To meet ever-increasing demands for higher volumetric energy density at packagelevel, packing more active materials in a limited volume becomes increasingly difficult since transportation of reactants(e.g. electrolyte) and charges through high-tortuosity channels/pathways in thick electrodes meets large impedance[1].

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Comparatively study on the related indexes of combustion characteristics of different formula biomass fuels

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Comparatively study on the related indexes of combustion cha...

Deterministic and Robust Volt-var Control Methods of Power System Based on Convex Deep Learning

作者： GOU Wentao LI Maojun WAND Xiaojian ZHONG Junzhou CHEN Jianjun GUO Hongyan deng shiyuan Tobacco Laboratory South China Agricultural University Guangdong Shaoguan Municipal Tobacco Company

In order to study the feasibility of the application of biomass fuel in tobacco leaf curing, we used the high efficiency biomass pellet molding machine(HCK045A type) to produce 9 different formula biomass pellet fuels. Taking the 100% pulverized coal as contrast, we studied and compared the structure components, industrial analysis, heat value, ash components, ash fusibility and physical properties of different formulas. The results showed that: 50% sawdust+50% tobacco straw formula had higher biological components such as cellulose and lignin. It also had higher volatile and fixed carbon content, lower ash and water content, higher ash melting point temperature, short ignition time, long combustion duration, low bottom ash clinkering rate and better performance of physical properties such as breaking strength and water permeability. Compared with CK, although the biomass fuel’s heat value is slightly lower, other combustion performance indexes can reach the technical requirements of tobacco leaf curing. So it can be used as an alternative source of energy for tobacco leaf curing.

关键词： biomass fuel combustion characteristics structure components industry analysis physical properties

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Journal of Modern Power Systems and Clean Energy 2024年第3期12卷 719-729页

作者： Qing Ma Changhong deng the School of Electrical Engineering and Automation Wuhan UniversityWuhanChina

Volt-var control(VVC)is essentially a non-convex optimization problem due to the non-convexity of power flow(PF)constraints,resulting in the difficulty in obtaining the optimum without convexity *** existing second-order cone method for the convexity conversion often leads to a sharp increase in PF constraints and optimization variables,which in turn increases the optimization difficulty or even leads to optimization *** paper first proposes a deterministic VVC method based on convex deep learning power flow(DLPF).This method uses the input convex neural network(ICNN)to establish a single convex mapping between state parameters and node voltage to complete the convexity conversion while the optimization variables only correspond to reactive power equipment,which can ensure the global optimum with extremely fast computation *** cope with the impact brought by the uncertainty of distributed energy and omit the additional worst scenario search of traditional robust VVC,this paper proposes robust VVC method based on convex deep learning interval power flow(DLIPF),which continues to adopt ICNN to establish another convex mapping between state parameters and node voltage *** DLIPF with DLPF,this method decreases the modeling and optimization difficulty of robust VVC *** results on 30-bus,118-bus,and 200-bus systems prove the correctness and rapidity of the proposed methods.

关键词： Volt-var control convexity conversion convex deep learning power flow

Non-intrusive Load Monitoring Based on Graph Total Variation for Residential Appliances

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Journal of Modern Power Systems and Clean Energy 2024年第3期12卷 947-957页

作者： Xiaoyang Ma Diwen Zheng Xiaoyong deng Ying Wang Dawei deng Wei Li the College of Electrical Engineering Sichuan UniversityChengdu 610065China State Grid Chongqing Electric Power Company Chongqing 400014China State Grid Sichuan Electric Power Company Chengdu 610095China State Grid Hubei Electric Power Company Limited Research Institute Wuhan 430077China

Non-intrusive load monitoring is a technique for monitoring the operating conditions of electrical appliances by collecting the aggregated electrical information at the household power *** several studies on the mining of unique load characteristics,few studies have extensively considered the high computational burden and sample *** on lowfrequency sampling data,a non-intrusive load monitoring algorithm utilizing the graph total variation(GTV)is proposed in this *** algorithm can effectively depict the load state without the need for prior ***,the combined Kmeans clustering algorithm and graph signals are used to build concise and accurate graph structures as load *** GTV representing the internal structure of the graph signal is introduced as the optimization model and solved using the augmented Lagrangian iterative *** introduction of the difference operator reduces the computing cost and addresses the inaccurate reconstruction of the graph *** low-frequency sampling data,the algorithm only requires a little prior data and no training,thereby reducing the computing *** conducted using the reference energy disaggregation dataset and almanac of minutely power dataset demonstrated the stable superiority of the algorithm and its low computational burden.

关键词： Non-intrusive load monitoring graph total variation augmented Lagrangian function smart grid

Scattering of Water Waves by Dual Symmetric Inclined Floating Porous Barriers Using the DBEM

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China Ocean Engineering 2024年第1期38卷 156-168页

作者： WANG Li-xian deng Yan-wen YE Yang-sha deng Zheng-zhi Key Laboratory of High Performance Ship Technology(Wuhan University of Technology) Ministry of EducationWuhan 430063China School of Naval Architecture Ocean and Energy Power EngineeringWuhan University of TechnologyWuhan 430063China Key Laboratory of Water-Sediment Sciences and Water Disaster Prevention of Hunan Province Changsha 410114China Institute of Port Coastal and Offshore EngineeringZhejiang UniversityZhoushan 316021China

The scattering of normally incident water waves by two surface-piercing inclined perforated barriers in water with a uniform finite depth is investigated within the framework of linear water wave *** that thin barriers are zero-thickness,a novel numerical method involving the the coupling of the dual boundary element method(DBEM)with damping layers is *** order to effectively damp out the reflected waves,two damping layers,instead of pseudoboundaries are implemented near the two side boundaries of the computational ***,the modified linearized free surface boundary conditions are formulated and used for solving both the ordinary boundary integral equation as well as the hypersingular boundary integral equation for degenerate *** newly developed numerical method is validated against analytical methods using the matched eigenfunction expansion method for the special case of two vertical barriers or the inclined angle to the vertical being *** influence of the length of the two damping layers has been ***,these findings are also validated against previous results for several *** validation,the numerical results for the reflection coefficient,transmission coefficient and dissipation coefficient are obtained by varying the inclination angle and porosity-effect *** effects of both the inclination angle and the porosity on the amplitudes of wave forces acting on both the front and rear barriers are also *** is found that the effect of the inclination angle mainly shifts the location of the extremal values of the reflection and the transmission ***,a moderate value of the porosity-parameter is quite effective at dissipating wave energy and mitigating the wave loads on dual barriers.

关键词： dual boundary element method inclined perforated floating breakwater reflection coefficient transmission coefficient damping layer

Mathematical framework of nonlinear elastic waves propagating in pre-stressed media

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Applied Mathematics and Mechanics(English Edition) 2024年第10期45卷 1705-1716页

作者： Jiangcheng CAI Mingxi deng College of Aerospace Engineering Chongqing UniversityChongqing 400044China

Acoustic nonlinearity holds potential as a method for assessing material *** to the acoustoelastic effect,where the velocity of elastic waves is influenced by third-order elastic constants,the propagation of nonlinear acoustic waves in pre-stressed materials would be influenced by higher-order elastic *** this,there has been a notable absence of research exploring this ***,this paper aims to establish a theoretical framework for governing the propagation of nonlinear acoustic waves in pre-stressed *** delves into the impact of pre-stress on higher-order material parameters,and specifically examines the propagation of one-dimensional acoustic waves within the contexts of the uniaxial stress and the biaxial *** paper establishes a theoretical foundation for exploring the application of nonlinear ultrasonic techniques to measure pre-stress in materials.

关键词： acoustoelastic effect nonlinear elastic wave pre-stress medium higher-order elastic constant

INVARIANTS-PRESERVING DU FORT-FRANKEL SCHEMES AND THEIR ANALYSES FOR NONLINEAR SCHRÖDINGER EQUATIONS WITH WAVE OPERATOR

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Journal of Computational Mathematics 2024年第3期42卷 814-850页

作者： Dingwen deng Zhijun Li College of Mathematics and Information Science Nanchang Hangkong UniversityNanchang 330063China

Du Fort-Frankel finite difference method(FDM)was firstly proposed for linear diffusion equations with periodic boundary conditions by Du Fort and Frankel in *** is an explicit and unconditionally von Neumann stable ***,there has been no research work on numerical solutions of nonlinear Schrödinger equations with wave operator by using Du Fort-Frankel-type finite difference methods(FDMs).In this study,a class of invariants-preserving Du Fort-Frankel-type FDMs are firstly proposed for one-dimensional(1D)and two-dimensional(2D)nonlinear Schrödinger equations with wave *** using the discrete energy method,it is shown that their solutions possess the discrete energy and mass conservative laws,and conditionally converge to exact solutions with an order of for ofο(T^(2)+h_(x)^(2)+(T/h_(x))^(2))1D problem and an order ofο(T^(2)+h_(x)^(2)+h_(Y)^(2)+(T/h_(X))^(2)+(T/h_(y))^(2))for 2D problem in ***,τdenotes time-step size,while,hx and hy represent spatial meshsizes in x-and y-directions,***,by introducing a stabilized term,a type of stabilized invariants-preserving Du Fort-Frankel-type FDMs are *** not only preserve the discrete energies and masses,but also own much better stability than original ***,numerical results demonstrate the theoretical analyses.

关键词： Nonlinear Schrodinger equations with wave operator Du Fort-Frankel finite difference methods Discrete energy and mass conservative laws Numerical convergence