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矮化处理对香蕉果实外观和贮藏品质的影响

食品工业科技 2024年第14期45卷 308-317页

作者：何羿仪黄梅华梁晓君覃柳燕马艳碧淡明李朝生韦绍龙何全光封碧红广西大学农学院广西南宁530004 广西农业科学院广西南宁530004 广西果蔬贮藏与加工新技术重点实验室广西南宁530004

目的:探讨矮化处理对香蕉果实的外观和后熟品质的影响。方法:以‘桂蕉9号’为实验材料,将矮化剂(主要成份为烯效唑和磷酸二氢钾)溶于水后灌根,香蕉苗长至第18片叶时使用矮化剂第一次矮化,长至第23片叶时进行第二次矮化,果实达到商品饱... 详细信息

目的:探讨矮化处理对香蕉果实的外观和后熟品质的影响。方法:以‘桂蕉9号’为实验材料,将矮化剂(主要成份为烯效唑和磷酸二氢钾)溶于水后灌根,香蕉苗长至第18片叶时使用矮化剂第一次矮化,长至第23片叶时进行第二次矮化,果实达到商品饱满度时采收。以果实外观(果柄长度、蕉指周长)和后熟品质,包括果皮颜色(L*值、a*值、b*值、C*值、h*值)、果实硬度、呼吸速率、乙烯释放量、果肉可溶性糖(果糖、蔗糖、葡萄糖)含量和有机酸(草酸、奎宁酸、苹果酸、琥珀酸、VC、柠檬酸、延胡索酸)含量作为参考指标,研究矮化处理对香蕉果实贮藏品质的影响。结果:矮化组和对照组的果柄长度和蕉指周长分别有极显著差异(P<0.01)和显著差异(P<0.05);在22℃贮藏条件下,矮化组和对照组果皮色差和硬度的变化总体上无显著差异;进入跃变期后,矮化组果实的CO_(2)释放量和乙烯释放量均高于对照组,但未达到显著水平。矮化组果实的苹果酸含量在整个后熟期间均低于对照组,并在成熟度3级时达到显著水平(P<0.05);成熟度至4级和5级时,矮化组的琥珀酸含量显著低于对照组(P<0.05),且分别达到极显著差异水平(P<0.01)和显著差异水平(P<0.05);奎宁酸含量在果实成熟度5级时,矮化组低于对照组,并达到显著差异水平(P<0.05)。两组果实果糖、蔗糖、葡萄糖的含量和变化趋势无显著差异;在成熟度达到7级时,矮化组和对照组的糖酸比无显著差异。结论:矮化处理缩小了‘桂蕉9号’的蕉柄长度和蕉指周长,改变了部分有机酸的代谢,但没有显著改变贮藏寿命和食用品质。

关键词： ‘桂蕉9号’ 矮化处理外观性状后熟特性贮藏品质

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Problems and Countermeasures of Fruit and Vegetable Logistics Distribution Development in Guangxi Zhuang Autonomous Region

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Asian Agricultural Research 2023年第10期15卷 1-5,9页

作者： Xi XU bihong feng College of Agriculture Guangxi UniversityNanning 530004China

The logistics transportation and distribution of fruits and vegetables has become one of the important links for people to obtain food,and it is also an important direction and emerging challenge in the logistics *** the social economy and transportation develop,the consumption ability of residents has been improved,and the high demand for fruits and vegetables has promoted the transportation of fruits and vegetables to meet the development conditions of the future fruit and vegetable *** study of fruit and vegetable logistics distribution can improve the efficiency of fruit and vegetable distribution,improve the construction of fruit and vegetable distribution system,and also meet the needs of people for different kinds of fruits and *** Guangxi fruit and vegetable distribution as an example,through empirical investigation,this paper studies the existing problems in the development of logistics distribution in the fruit and vegetable distribution industry,and puts forward corresponding measures and countermeasures according to the problems,so as to innovate the fruit and vegetable distribution mode in Guangxi Zhuang Autonomous Region.

关键词： Fruit and vegetable distribution Fruit and vegetable logistics Development

Pan-plastome approach empowers the assessment of genetic variation in cultivated Capsicum species

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Horticulture Research 2019年第1期6卷 456-470页

作者： Mahmoud Magdy Lijun Ou Huiyang Yu Rong Chen Yuhong Zhou Heba Hassan bihong feng Nathan Taitano Esther van der Knaap Xuexiao Zou feng Li Bo Ouyang Key Laboratory of Horticultural Plant Biology(Ministry of Education) Huazhong Agricultural University430070 WuhanChina Genetics Department Faculty of AgricultureAin Shams UniversityCairo 11241Egypt College of Horticulture and Landscape Hunan Agricultural University410128 ChangshaChina College of Agriculture Guangxi University530004 NanningChina Department of Horticulture College of Agriculture&Environmental SciencesUniversity of GeorgiaAthensGA 30602USA

Pepper species(Capsicum spp.)are widely used as food,spice,decoration,and *** the recent old-world culinary impact,more than 50 commercially recognized pod types have been recorded worldwide from three taxonomic complexes(A,B,and P).The current study aimed to apply a pan-plastome approach to resolve the plastomic boundaries among those complexes and identify effective loci for the taxonomical resolution and molecular identification of the studied species/***-resolution pan-plastomes of five species and two varieties were assembled and compared from 321 *** and network analyses clarified the taxonomic position of the studied species/varieties and revealed a pronounced number of accessions to be the rare and endemic species,***,that were mistakenly labeled as *** *** among ***,some NCBIdeposited plastomes were clustered differently from their *** rpl23-trnI intergenic spacer contained a 44 bp tandem repeat that,in addition to other InDels,was capable of discriminating the investigated Capsicum species/*** rps16-trnQ/rbcL-accD/ycf3-trnS gene set was determined to be sufficiently polymorphic to retrieve the complete phyloplastomic signal among the studied Capsicum *** pan-plastome approach was shown to be useful in resolving the taxonomical complexes,settling the incomplete lineage sorting conflict and developing a molecular marker set for Capsicum ***.

关键词： Capsicum approach

A novel method for AFRPs burrs removal:Principle of mechanochemo-induced fiber fracture

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Chinese Journal of Aeronautics 2024年第7期37卷 522-538页

作者： Jie XU Bo LI Pingfa feng Qiang WANG feng feng Division of Advanced Manufacturing Tsinghua Shenzhen International Graduate SchoolTsinghua UniversityShenzhen 518055China Department of Mechanical Engineering Tsinghua UniversityBeijing 100084China Changhe Aircraft Industry(Group)Co.Ltd Jingdezhen 333000China

Burrs generated during the machining of Aramid-Fiber-Reinforced Composites(AFRPs)pose a challenge for the production efficiency of aircraft and helicopter housing *** studies have generally attempted to suppress burrs by referring to delamination suppression *** contrast to stratification,burrs are remediable machining *** such,a mechanochemical method with burrs trimming technological strategy are implemented to effectively combat ***,we clarify the mechanism by which aramid fibers cannot be cut off using analytical and numerical *** addition,the mechanism of fiber fracture with Modified Polyurethane Reactive Polymer(M-PUR),and development of anti-burr devices(thermostatic adhesive sealed generator)are ***,the experimental results show that the reduction rate in burr length is 87%-91%through the mechanochemical *** method not only opens a new avenue to solve the burr problem of aramid fibers but also builds an interdisciplinary bridge between polymer science and composite machining.

关键词： Mechanochemical method Burrs Orthogonal cutting Aramid fiber-reinforced composites Milling

Record-high efficiency perovskite LEDs achieved by accelerating radiative recombination

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Science China Materials 2024年第9期67卷 3039-3040页

作者： feng Gao Department of Physics Chemistry and BiologyLinköping UniversityLinköping58183Sweden

Light-emitting diodes(LEDs)have revolutionized the lighting and displays due to their superior energy *** increasing demand for more efficient and brighter thin-film LEDs in flat-panel displays and solid-state lighting applications has driven extensive research into perovskite materials,which show great promise for high brightness and efficiency.

关键词： lighting radiative high

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Derivation of Expanded Isospectral-Nonisospectral Integrable Hierarchies via the Column-vector Loop Algebra

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Acta Mathematicae Applicatae Sinica 2024年第3期40卷 778-800页

作者： Hai-feng WANG Yu-feng ZHANG School of Science Jimei UniversityXiamen 361021China School of Mathematics China University of Mining and TechnologyXuzhou 221116China

A scheme for generating nonisospectral integrable hierarchies is *** on the method,we deduce a nonisospectral hierarchy of soliton equations by considering a linear spectral *** follows that the corresponding expanded isospectral and nonisospectral integrable hierarchies are deduced based on a 6 dimensional complex linear space ■.By reducing these integrable hierarchies,we obtain the expanded isospectral and nonisospectral derivative nonlinear Schr?dinger *** using the trace identity,the biHamiltonian structure of these two hierarchies are also ***,some symmetries and conserved quantities of the resulting hierarchy are discussed.

关键词： expanded isospectral-nonisospectral integrable hierarchies column-vector loop algebra bi-Hamiltonian structure symmetry

Carbon-based materials with combined functions of thermal management and electromagnetic protection: Preparation, mechanisms, properties, and applications

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Nano Research 2024年第3期17卷 883-903页

作者： Junwei Yue Yiyu feng Mengmeng Qin Wei feng School of Materials Science and Engineering and Tianjin Key Laboratory of Composite and Functional Materials Tianjin UniversityTianjin 300350China

The proliferation of high-power,highly informationized,and highly integrated electronic devices and weapons equipment has given rise to increasingly conspicuous issues about electromagnetic(EM)pollution and thermal *** issues,in turn,impose constraints on the performance of such equipment and jeopardize personnel *** materials,owing to their diverse and modifiable structures,offer adjustable thermal and electric conductivity,rendering them highly promising for applications in fields such as thermal management and EM protection which have garnered extensive research and *** pursuit of integrated device and equipment development has elevated the demand for multifunctional materials,prompting significant research into carbon-based composite materials that include both thermal management and EM protection ***,there are no relevant reviews on this topic at ***,this work consolidates research findings from recent years on carbon matrix composites exhibiting dual attributes of thermal management and EM *** attributes include thermally conductive electromagnetic interference(EMI)shielding materials,thermally insulating EMI shielding materials,thermally conductive EM wave(EMW)absorbing materials,and thermally insulating EMW absorbing *** paper elucidates the fundamental principles underpinning thermal conduction,thermal insulation,EMW absorbing,and EMI ***,it engages in discussions surrounding areas of contention,design strategies,and the functional properties of various material ***,the paper concludes by presenting the challenges encountered and potential research strategies about composites endowed with both thermal management and EM protection functionalities,while also envisaging the development of novel multifunctional EM protection materials.

关键词： carbon-based composites electromagnetic interference shielding microwave absorption thermal conduction thermal insulation

Design and identification of a double-acting piezoelectric-hydraulic hybrid actuator

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Chinese Journal of Aeronautics 2024年第3期37卷 456-467页

作者： Junjian ZHANG Zhihua feng Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes University of Science and Technology of ChinaHefei 230026China

Traditional single-acting piezoelectric-hydraulic hybrid actuators usually have the problem of inertial force caused by flow pulsation of the liquid,which degrades their output *** suppress or solve the associated inertial force and enhance its output capabilities,this paper proposes a new type of double-acting piezoelectric-hydraulic hybrid actuator with four check valves acting as mechanical *** new hybrid actuator was fabricated and its output performance was *** the voltage is 700 Vp-pand the bias pressure is 2 MPa,the pulsation ratesδof the new actuator at 400 Hz,500 Hz and 600 Hz are 2.29,2.08 and 1.78,respectively,whileδof the single-acting hybrid actuator under the same conditions are 10.98,11.05 and ***,the liquid pulsation rate of the new hybrid actuator is significantly reduced,which is beneficial for improving the flow uniformity and weakening the influence of inertial force on the hybrid *** strategy ultimately leads to a maximum no-load velocity of 168.1 mm/s at 600 Hz and a maximum blocking force of 141 N at 450 Hz for the new hybrid *** addition,this strategy has the potential to be used in other electrohydrostatic actuators to improve their performance.

关键词： Double-acting Flow pulsation Inertial force Piezoelectric actuators Piezoelectric devices Piezoelectric hydraulic actuation Piezoelectric pump

Rational Solutions of First Order Algebraic Ordinary Differential Equations

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Journal of Systems Science & Complexity 2024年第2期37卷 567-580页

作者： feng Shuang SHEN Liyong School of Physical and Mathematical Sciences Nanjing Tech UniversityNanjing 211816China School of Mathematical Sciences University of Chinese Academy of SciencesBeijing 100049China

Let f(t,y,y')=∑ _(i=0)^(n )a_(i)(t,y)y'^(i)=0 be an irreducible first order ordinary differential equation with polynomial *** in 1998 proved that there exists a constant C such that every rational solution of f(t,y,y')=0 is of degree not greater than *** show that this degree bound C depends not only on the degrees of f in t,y,y' but also on the coefficients of f viewed as the polynomial in t,y,y'.In this paper,the authors show that if f satisfies deg(f,y)0,then the degree bound C only depends on the degrees of f in t,y,y',and furthermore we present an explicit expression for C in terms of the degrees of f in t,y,y'.

关键词： Degree bound first order AODE height rational solution