钱塘江流域水土流失特点和动态分析

应用遥感技术和定点调查相结合的方法对钱塘江流域水土流失及其动态进行分析．钱塘江流域省内水土流失量占全省总流失量的４７．６６％．钱塘江中上游的金衢地区是水土流失较严重地区，面租达３９５５ｋｍ２，占该地区山地面积的２３．２５％，衢州市近１０年（１９８１～１９９０年）间统计，水土流失面积由原来的１５８６ｋｍ２增加到２６７５ｋｍ２，扩大６８、６６％；以经济林为主的常山县开发过程中强调水土保持措施，但流失面积仍扩大４７、３８％；．以用材林为主的开化县水土流失有急剧上升的趋势。文章讨论了钱塘江中上游近期水土流失的特点并提出综合治理的建议．     

一种植物病毒检测新方法—纳米上转换荧光技术

随着大豆进口量的日益增加,大豆携带病毒传入我国的风险在不断增大,高效、快速地进行植物病毒检测,防止外来有害生物入侵,是目前各口岸植物检疫工作的重点。本文介绍了一种植物病毒检测的新方法—纳米上转换荧光技术。该技术是一种利用磁性纳米颗粒(magnetic nanoparticles, MNP)进行病毒分离、富集和定位;同时引入上转换荧光(up converting phosphor, UCP)材料作为标记物的免疫检测方法,具有高度的抗干扰性、多元性、稳定性和安全性等特点。     

The Software Implementation of Neural Network Fuzzy Inference Cooperation System

This poper sets up a new Neural Network Fuzzy inference Cooperation system which is based on fuzzy inference principle in Expert Systems,take advantage of the powerful learning function, the little sensitivity to input layer's samples,and the fast convergence and so on in FCBP and take advantage of the good sort property and good suit property to fuzzy value in MFART Network.     

Multiple Layer BP Neural Network for Fuzzy Calculating

The FCBP(Fuzzy calculating BP) algorithm which is proposed by this paper hasovercome the sensitivity for samples,reduced the number of input layer's samples,lightened the burden of input layer.it is suitable to fuzzy inference and pattern recognition.     

杨小舟蛾发生规律与测报技术研究

杨上舟蛾［Ｍｉｃｒｏｍｅｌａｌｏｐｈａ ｔｒｏｇｌｏｄｙｔａ（Ｇｒａｅｓｅｒ）］中关中１年发生５代，以７、８月份的３、４代种群数量最大，危害最重。其天敌种类较多，多一年内种群数量消长影响较大，５～８月份降雨较多的年份发生较重。介绍了发育进度预测法，种群消长趋势指数预测法和黑光洒诱测法在杨小舟蛾测报中的应用。     

Evaluating the navigation performance of multi-information integration based on low-end inertial sensors for precision agriculture

The main objective of this research was to evaluate the navigation performance of multi-information integration based on a low-end inertial measurement unit (IMU) in precision agriculture by utilizing different auxiliary information (i.e., GNSS real-time kinematic (RTK), non-holonomic constraints (NHC) and dual antenna GNSS). A series of experiments with different operation scenes (e.g., open sky in wet and dry soils) were carried out for quantitative analysis. For the position drift error during a 20-s GNSS outage, the dual-antenna GNSS-assisted approach did not provide a reduction, and the NHC reduced the maximum error in the lateral and vertical directions by over 80% in the dry soil test, but only by approximately 30% in the wet soil test. The heading error with continuous GNSS assistance can be less than 0.03° and be reduced by more than 90% with the aid of dual-antenna GNSS. Additionally, the NHC reduced the heading error from 0.54° to 0.21° and from 0.34° to 0.25° in the dry and wet soil tests respectively. The results suggested that the multi-information integration improved the positioning and orientation reliability. Moreover, the lateral positioning accuracy required for the control of agriculture autonomous vehicles was achieved at approximately 3.0 mm with over a 60% accuracy improvement brought by the dual-antenna GNSS assistance. In contrast to the vulnerability of a single system, multi-information integration can provide comprehensive navigation information with higher reliability and lower costs. Hence, multi-information fusion will be a great opportunity for agriculture to meet the high-accuracy and high-reliability requirements of precision agriculture.

     

农作物抗旱性鉴定仪的研制和应用

依据陈毓荃等首次提出的连续升温电导法，研制了ＮＫＪ－１型农作物抗旱性鉴定仪，对１４种小麦抗旱性的鉴定结果与田间观测结果一致，也适于果树抗热性鉴定。     

大蒜不定芽的诱导及其增殖系数的调节

为获得白皮大蒜组培繁殖体系,以其茎尖为材料,通过BA和NAA不同激素配比试验研究,结果表明:诱导愈伤组织的最适培养基为:MS BA0.2mg/L NAA0.5mg/L,诱导率达60%;诱导不定芽的最适培养基为:MS BA1.0mg/L NAA0.1mg/L,丛生芽繁殖系数高达80%。同时,为建立扩繁最佳体系,分别研究了激素、pH、谷氨酸钠三因素对不定芽增殖系数的调节效果,研究表明:添加0.5mg/L的GA3使增值系数提高到13.8;pH5.8最利于不定芽增值;添加10mg/L谷氨酸钠能在多次继代培养中保持较高的增值系数。     

健康城市建设之健康危险因素研究——以T市为例

《“健康中国2030”规划纲要》提出“健康中国”战略,健康概念不再局限于人民的身体健 康,而是扩大到健康身体、健康环境、健康经济、健康社会在内的大健康。健康目前已经成为我 国重要发展战略,各地区也正加紧地方的健康战略,以区域、城市为单位的健康体系建设拉开帷 幕。     

Studies toward the Total Synthesis of Itralamide B and Biological Evaluation of Its Structural Analogs

Itralamides A and B were isolated from the lipophilic extract of Lyngbya majuscula collected from the eastern Caribbean. Itralamide B (1) showed cytotoxic activity towards human embryonic kidney cells (HEK293, IC₅₀ = 6 μM). Preliminary studies disapproved the proposed stereochemistry of itralamide. In this paper, we will provide a full account of the total synthesis of four stereoisomers of itralamide B and the results derived from biological tests of these structural congeners.