果蔬气调贮藏保鲜技术及设备

详细介绍了气调贮藏对果蔬延缓新陈代谢,保持新鲜度,延长贮藏期和销售货架期的功能,并对气调库库体结构进行了分析说明;同时,又对气调系统各个子系统功能进行了详实介绍.     

江西省不同林龄杉木碳储量分配格局

在省级尺度上分析不同林龄杉木碳储量数据,以掌握江西省杉木人工林碳储量动态分配格局。本研究对江西省杉木林生态系统进行了野外调查,并对现有杉木生物量数据进行了综合分析。结果表明：江西省杉木人工林碳储量变化范围为27.82~82.61 t/hm²,其乔木层碳储量占94.2%以上。杉木林和乔木层碳储量随林龄先增加后略微下降,而各龄林的灌木层、草本层和凋落物层碳储量均没有显著差异。幼龄林、近熟林、成熟林各组分碳储量大小排序均为乔木层>凋落物层>灌木层>草本层,而在中龄林和过熟林中则为乔木层>凋落物层>草本层>灌木层。幼龄林各器官碳储量大小排序为树干>叶>根>枝,而其他林龄中的排序均为树干>根>枝>叶。     

An field programmable gate array implementation of an image encryption algorithm based on a discrete chaotic map

Software encryption cannot satisfy real time requirements for multimedia applications which usually involve large volumes of data. To address this problem, an field programmable gate array(FPGA) implementation of the Cyclone EP1C6 for a Kolmogorov chaotic map based image encryption algorithm MASK was proposed. The algorithm was composed of four basic parts: Mixture, key Add, S box and Kolmogorov chaotic map transforms. These parts specifically act on the image as follows: diffusion, applying secret keys, nonlinearity, and permutation. The correlation of adjacent pixels, UACI and the key space of the system subsequently were studied. The source occupation proportion of the hardware was calculated statistically and showed low occupation. Among the advantages of the proposed system are high security, fast encryption speed, and low hardware resources consumption. The proposed system is suitable for implementation in inexpensive FPGA.     

小麦玉米带田高产平衡施肥研究

研究采用土壤养分状况系统研究法,根据土壤养分亏缺状况,平衡微量元素后确定氮磷钾的适宜用量,研究小麦玉米带田的平衡施肥方案。试验结果表明,氮、磷、钾及微量元素的平衡施用改善了小麦、玉米的经济性状,提高了小麦千粒重、玉米的穗粒数、穗粒重和千粒重;平衡微量元素后带田中限制小麦产量的主要因子是氮、磷,限制玉米产量的主要因子是氮、磷、钾;平衡施肥处理的产量、产值与纯收入均增加,其中处理N2P2K2的产值与纯收入最高,分别为17085元/hm2和15240元/hm2。综合分析结果说明,小麦玉米带田高产平衡施肥配方应为N2P2K2。     

A Study on Theory and Application of Automatic Balance for Rotors

The study on automatic balance of the rotor was made both from theory and ap-plication.In the light of the feature of automatic balancing,new analysis about the mechanical modelof vibratory system was done,and the result is that the accurate model of system can be gained bycompensation method and the traditional principle errors of balance machine both for soft and hardbearing can be overcome.The autornatic balance testing theory was proposed.The automatic balancesystem has been developed a nd the fu n ction a nd techn ical key are also discussed in detail.     

Innovating Method of Mechanism Configuration Project Based on Kinematic Chain

The structure design is the most crucial and innovative one in the process of mechanism system design, and attention is constantly given to them. Although the various methods of structural synthesis are presented, more study due to faultiness of them are essential. All of available configurations of the single joint kinematic chain are gotten by replacing its pairs. On the basis of symbolization of pairs, the authors put forward the mathematic approach of permutation and combination by which all of configurations of the kinematic chain can be obtained, structure graph is used to judge the type of same fabric of the kinematic chain. Finally their application examples in engineering are given.     

A NEW METHOD BY USING MASS AND ACCELERATION PARAMETERS FOR BALANCING INERTIAL FORCE OF MECHANISM

This paper presents a new method by using mass and acceleration parameters for balancing inertial force of mechanism. Compared with other balance methods, this one is simple, clear and superior in regularity when the balancing equation of complex mechanism is established, and its solving procedure is also easy. The new methcd is convenient to learn and use as well as convenient to program.     

Content-aware Load Balancing Strategy in Web Cluster System

The capacity problem of web server can be solved by web cluster technology. The key point is load balancing strategy and algorithm. Traditional slrategies are effective to some kinds of web sites, but not suitable for all. The paper analyses the load characters of different kind of web sites. A content-aware web cluster load balancing strategy and algorithm is proposed. The efficiency will be evaluated through emulation experiments.     

统筹城乡发展中的农村资源与环境问题及其对策

“十二五”时期是全面建设小康社会的关键时期,是深化改革开放、加快转变经济发展方式的攻坚时期。作为转变经济发展方式的重要途径,统筹城乡发展也是现阶段“三农”工作的指导思想与政策支持体系的核心内容。从统筹城乡发展的内涵入手,分析了统筹城乡发展中的农村资源与环境面临的形势、问题及其根源,并从改造传统产业、实施农村清洁工程、调整农业产业结构、推进农业清洁生产和提高农民科学素质等多个方面提出了应对之策。     

优化城乡建设用地结构与布局研究——以河北省藁城市为例

优化城乡建设用地结构与布局是统筹城乡发展、构建和谐社会的重要内容。本研究为了解决在统筹城乡发展过程中如何更好地安排城乡建设用地结构与布局的问题,以河北省藁城市为研究对象,在充分调查河北省藁城市城乡建设用地的现状的基础上,从数量、布局、所占比重等方面分析了城乡建设用地存在的问题。研究认为,城镇规模偏小、土地集约利用程度相对较低、双重用地问题突出、城市化水平低、产业发展竞争力不足等问题是阻碍城乡建设用地结构与布局优化的重要因素,并从科学编制土地利用总体规划、建立土地集约利用评价体系、深化改革、加强土地管理、集约利用土地的城镇化道路等方面提出相应优化藁城市城乡用地结构,推进建设用地整理的对策建议。     

农户参与城乡建设用地增减挂钩的意愿研究——基于重庆市江津区的380户农户调查数据

本研究随机选择了重庆市江津区珞璜镇、李市镇、杜市镇、吴滩镇和柏林镇等5个镇的7个村的380户农户,对其参与城乡建设用地增减挂钩的意愿进行了调查。研究表明：几乎所有的农户都表示如果有个人或公司愿意流转他们的土地且价格合理,他们都愿意流转土地。同时,针对研究区农户的搬迁意愿进行调查后发现,只要拆迁补偿合理,解决农户的安置房和社会保障问题,多数农户是愿意搬迁的。由此可见,进行城乡建设用地增减挂钩是符合农民实际需要的,有利于促进农业产业化和规模化经营,改善农民生产、生活条件。     

制度约束下的乡村人居环境建设模式研究——以湖南省衡南县工联村为例

优化乡村人居环境,改善农户生活质量,统筹城乡发展是社会主义新农村建设的一项重要内容。以实地调研为基础资料,以湖南省新农村示范点——工联村为例,探索制度约束下乡村人居环境建设的特征、困境与优化路径。在集体合作经营体制下,工联村人居环境建设在筹集资金、约束农户人居行为、改善基础设施、推进社会事业等方面具有一定的制度优势,但也存在诸多困境。从4个方面提出了优化路径,即鼓励制度创新,完善人居环境建设模式;优化村庄布局,规范农户居住行为;加快村庄整治,引导农户生活行为;整体营销村庄,扩大人居环境示范效应。     

On-demand routing algorithm based on load balancing and mobility prediction in wireless mobile Ad hoc network

The traditional routing protocol for wireless mobile ad hoc networks is unable to achieve balanced energy consumption and could not adapt to the dynamic topology changes well.A novel on-demand rooting algorithm is proposed based on load balancing and mobility prediction.The proposed rooting algorithm excludes the unstable links in routing discovery,and allows the node with more energy forward the routing request packet preferentially.In addition,it adopts the active local routing recovery strategy by predicting the link connection time,and finishes the repair work before the link being actually failure.The simulation experiments demonstrate that,comparing with the traditional AODV protocol,with slight increase of the rooting control overhead,the proposed algorithm increases the average packet delivery ratio,decreases the average end-to-end delay of the data packets,and achieves load balancing in the network and prolong the life-span of the network,which shows the proposed algorithm is highly practical.     

A NEW METHOD BY USE OF MASS AND ACCELARATION PARAMETERS FOR BALANCING THE SHAKING MOMENT OF ARTICULATED MULTI-BAR LINKAGES

In this paper,a new method with general purpose ispresented for balancing the shaking moment of articulated multi-barlinkage.The concept of this method is clear.The moment equation oflinkages is easy to establish and solve.Furthermore its pattern structuremakes it convenient to be programmed.     

农村国土整治项目规划方案的优选——以重庆市杨柳项目为例

为了在国土整治项目规划中对规划方案进行优选,笔者以重庆市忠县拔山镇杨柳项目为例,运用层次分析法量化了影响规划方案优选的主要因子,并构建了优化模型。结果表明,在备选的3个方案中,方案2的层次总排序最高,为0.532;方案3的层次总排序居中,为0.346;方案1的层次总排序最低,为0.122。方案2是重庆市杨柳项目最优的国土整治方案。同时也说明,用层次分析法进行农村国土整治项目规划方案的优选是可行的。     

QTL analysis for early-maturing traits in cotton using two upland cotton (Gossypium hirsutum L.) crosses

Making use of the markers linked closely to QTL for early-maturing traits for MAS (Marker-assisted selection) is an effective method for the simultaneous improvement of early maturity and other properties in cotton. In this study, two F₂ populations and their F_2:3 families were generated from the two upland cotton (Gossypium hirsutum L.) crosses, Baimian2 × TM-1 and Baimian2 × CIR12. QTL for early-maturing traits were analyzed using F_2:3 families. A total of 54 QTL (31 suggestive and 23 significant) were detected. Fourteen significant QTL had the LOD scores not only > 3 but also exceeding permutation threshold. At least four common QTL, qBP-17 for bud period (BP), qGP-17a/qGP-17b (qGP-17) for growth period (GP), qYPBF-17a/qYPBF-17b (qYPBF-17) for yield percentage before frost (YPBF) and qHFFBN-17 for height of first fruiting branch node (HFFBN), were found in both populations. These common QTL should be reliable and could be used for MAS to facilitate early maturity. The common QTL, qBP-17, had a LOD score not only > 3 but also exceeding permutation threshold, explaining 12.6% of the phenotypic variation. This QTL should be considered preferentially in MAS. Early-maturing traits of cotton are primarily controlled by dominant and over-dominant effects.     

气候变化背景下的现代农业科技传播体系构建

在气候变化背景下我国现代农业发展面临着科技传播体系的缺失,具体表现为“传者本位”思想突出,农业适应气候变化的先进理念和先进技术无法传播到农村弱势群体;传播渠道过于狭窄,农业适应气候变化的先进理念和先进技术无法准确及时得到传播;农民科学素养不高,农业适应气候变化的先进理念和先进技术无法得到农民的追随与认同、扩散;传播内容受到限制,农业适应气候变化的先进理念和先进技术无法得到主动持续更新;“科教推用”难以结合,导致农业适应气候变化的先进理念和先进技术传播的效果不佳。因此,应构建“五个W分层分级环形互动科学传播体系模式”,即构建气候变化背景下的“现代农业科技传播者系统”;构建气候变化背景下的“现代农业科技讯息系统”;构建气候变化背景下的“现代农业科技媒介系统”;构建气候变化背景下的“现代农业科技受传者系统”;构建气候变化背景下的“现代农业科技效果系统”。这一体系模式既是适应气候变化的,也是适应现代农业发展趋势的。     

Topology Identification of Distribution Networks Based on Hierarchical Model

Traditional model of distribution networks mostly research the response of input excitation, by describing elements and connections of elements for distribution networks. When the states of vertexes in distribution networks have changed, the connections of elements transformation. Owning to the mutual couplings and branches of distribution networks, it is hard to achieve the global optimization for load balancing, reconfiguration and restoration after fault by nomograph. A new model based on hierarchical model is presented. This model can be employed to identify the zone and branches efficiently and offer a cogent topological analysis method for the global optimization. The test result shows the effectiveness of the proposed method.     

Load balancing strategy and ant optimization algorithm for grids

In view of the Campus Grid construction,which is also a crucial part of ChinaGrid project,the performance decline for grid scheduling algorithms when non-dedicated nodes emerge in multi-grid environment is studied.A load balancing algorithm to optimize resource usage rate is proposed.The paper involves three parts: problem modeling,algorithm design,and experiment evaluation.The experimental results show that the proposed algorithm is effective for solving the problem of resource usage rate decline under the discussed grid circumstance.     

Study and Practice of Safety Grade Assessment for Large Convention and Exhibition Centre

This paper takes "how to estimate the complex security of Large Convention and Exhibition Centre effectively" as the research goal.Based on analyzing the difficulties,target system,technical constitution,probing into the architecture,safety science,and using for reference the mathematics,operational research,statistics and modern system theory and method,trying to explore establishing an evaluation methodological system,which is provided with integrated characters on subject.Based on these ways,it exerts "quality to quantity" fuzzy analytical hierarchy process(FAHP) and aims at discussing the safety grade assessment of the Chongqing International Conference Exhibition Center focusing on designing theories.The aim is to enhance the integration of design practice and safe consciousness,strengthen the building safety management,and perfect city public security system.In practice,it is also an efficient tool for favoring values of architectural environmental safety.