Effect of chlorpyrifos and methyl chlorpyrifos on controlling rice ieaffolder(Cnaphalocrocis medinalis Guenee)in field

Rice leaffolder(Cnaphalocrocis medinalis Guenee) hasbecome a serious pest on rice in Jiangsu Province. The in-sect appeared in Jul and remained until Sep. A field trialwith 5 treatments and three replications was laid out in arandomized complete block design in a farm field in Jiang-su, China in 1993. The hybrid rice tested was transplantedinto 2×25m plots. Using a knapsack sprayer, we applied

Atmospheric Corrosion Monitoring of Field-exposed Q235B and T91 Steels in Zhoushan Offshore Environment Using Electrochemical Probes

This work aimed to in-situ monitor the atmospheric corrosion of steels exposed to Zhoushan offshore environment by using electrochemical noise（EN） technique. A portable EN monitoring system was established and two electrochemical probes（named as Q235 B and T91） were designed. Experimental results indicated that the noise resistance of T91 steel was higher than that of Q235 B steel, revealing that the corrosion resistance of T91 was higher than that of Q235 B. A 60-day monitoring result indicated that the noise resistance was well correlated with the weight loss data. Wavelet analyses results of EN data indicated that Q235 B underwent uniform corrosion and T91 suffered from localized corrosion, which was further confirmed by the surface observation. It is concluded that EN can be used as a new method to identify the corrosion form and corrosion resistance in atmospheric conditions.

Clinical Experience and Dosimetry Outcome in Treating Breast Cancer with Field-in-Field Technique

Purpose: The study is aimed to establish the dosimetric characteristics of field-in-field (FiF) technique for carcinoma of breast treatment in Nepal. We assumed that FIF technique may result in improved dose distribution and reduced acute toxicity in these patients. Methods: Forty breast cancer patients participated in this study. A total dose of 50 Gy in 25 fractions was prescribed to the planning target volume. FiF plan was generated in treatment planning system. Dose volume histograms were evaluated for PTV and organs at risks. Several parameters were analyzed for the PTVs and organ at risks (OARs) together with the Conformity index (CI), and the Homogeneity index (HI). Results: The dose coverage of breast volume was achieved. The V95% (volume of 95%) of PTV covered D95% (Dose of 95%). The PTV dose was covered to 49.98 ± 0.9 Gy and 49.81 ± 1.1 Gy for the left and right breast, respectively. The mean lung dose was 14.87 ± 0.91 Gy. The homogeneity index (0.26 ± 0.17 and 0.22 ± 0.13) and conformity index (1.59 ± 0.75 and 1.36 ± 0.45) were analyzed for left and right breast, respectively. Conclusion: The study supports the viability of FiF technique in the treatment of breast cancer in Nepal. The FIF technique enables better dose distribution in the PTV and reduces dose to OARs. The FiF technique provides dosimetric advantages and requires less planning time.

Ellipticity of motion of particle in field of inhomogeneous plane wave

The elliptic motion of particle in the fields of the inhomogeneous plane wavs that are generated on a liquid thermoviscoelastic solid interface is studied.. Calculations show that the ellipticity of the motion of Particle is related to the incident angle that the homogeneous plane wave incidents upon the interface. The influeree of viscous properties of solid on the ellipticity of particle's motion is small and shows near the critical angles of longitudinal and transversal wavs. Under the incidence at Rayleigh angle, the change of the ellipticity of motion of the particle is periodic in the wake of its Rayleigh wavelength and its elliptic locus is couoter clockwise and clockwise rotation periodically.

Benefits and Limitations of Volumetric Modulated Arc Therapy in Treating Bilateral Breast Cancer with Regional Lymph Nodes

Purpose: The study was performed comparing dosimetric characteristics of volumetric modulated arc therapy (VMAT) and field-in-field (FiF) techniques on a patient with synchronous bilateral breast carcinoma. Methods: The patients with bilateral breast cancer treatment were included in this study. A total dose of 40.05 Gy in 15 fractions was prescribed to the Planning Target Volume (PTV) of the whole bilateral breast cancer with the supraclavicular and infraclavicular nodes, with a complementary boost of 10 Gy in 4 fractions to the surgical bed (PTVboost). For both radiotherapy techniques, several VxGy parameters were analyzed for the PTVs, together with the Conformity index (CI), the Homogeneity index (HI) and the critical organs at risk (OARs), lungs and heart. Results: The patient was treated by the VMAT technique and the daily treatment time was less than 20 minutes with daily CBCT imaging. In the VMAT plan, the PTV 95% dose covered 38.89 ± 0.81 Gy, compared to 37.26 ± 1.02 Gy in the FiF technique. The VMAT plan improved the dose homogeneity index and lower dose in lung towards high dose region. Conclusion: The study demonstrates the viability of the VMAT technique in the treatment of bilateral breast cancer. The introduced single isocentric VMAT technique is fast to deliver and it increases the dose homogeneity of the target volume with some limitations. The treatment was well tolerated, without interruption of the treatment courses caused by treatment-related toxicities.

The Technology and Application of the Tree Planting Baseplate in Bare Rock Area

The ecological greening technology of the bare rock area of the arbor governance be-longs to the field of ecological environment restoration, selection of suitable arbors for vegetation restoration in bare rock area, vegetation recovery is the primary approach to governance the ecological environment of bare rock area. The reconstruction of bare rock area arbor-shrub-grass ecosystems is a global environmental science problem. Paying attention to Geological conditions with rich rock fissures and abundant groundwater in these fissures, following the idea to reconstruct ecosystem from arbor to shrub and grass and the principle one tree in a baseplate, authors develop a baseplate technique for tree planting in bare rock area. The baseplate includes the parent body, the root, and the cover to prevent evaporation. Especially, there are filled in nutritional soil for the parent body and the root, and the composition of nutritional soil are selected by test in laboratory, while optimal mix ratio of the composition is obtained. Then, application method in field is put forward. The technique can guarantee survival at early stage and growth in the later for tree planting in the baseplate. In particular, the root provides a good channel to guide tree roots into fissure rock and absorb groundwater in rock. Test in field shows that the baseplate technique has strong practicality in vegetation recovery of bare rock area. Test in field shows that the baseplate technique has strong practicality in vegetation recovery of bare rock area in the world.

MEMS-INS室内行人定位三维地图匹配算法

提高基于微机械(Micro-Electro-Mechanical System,MEMS)惯性导航系统(Inertial Navigation System,INS)的室内行人三维定位精度一直是一个研究热点和难点,其中器件误差是影响MEMS-INS精度的一个棘手问题.由于器件误差产生的机理十分复杂,采用现有的修正技术无法准确地对误差进行估计建模,导致MEMS-INS的位置精度不高.本文从室内环境结构分析入手,提出了一种三维地图匹配的条件随机场算法.通过设计导航输出的位姿信息与室内状态点的数学关系,结合最佳轨迹求取的算法建立室内三维地图匹配的算法模型.最后通过算法求解出的最佳匹配点坐标修正惯性导航输出的位置误差.

重力场对惯性导航定位误差影响研究与仿真

从惯性导航力学编排方程出发,将高阶重力场模型代替正常重力模型,分析了扰动重力引起的惯性导航误差;并从另一角度,对理想状态下扰动重力对惯性导航的影响进行了仿真分析,结果表明扰动重力影响显著。通过将重力垂线偏差分量引入惯性导航方程,改善传统方程的缺陷,探讨了垂线偏差对惯性导航的影响。在全面论述了扰动重力和重力垂线偏差对惯性导航的影响的基础上,结合实际情况提出了进行重力场误差补偿的两种方法。

矿山开采地表位移场的大变形分析

将非线性连续介质力学的有限变形几何学应用到矿山开采地表位移场的变形分析中，从理论上阐明了有限变形几何学能精确地描述地表变形的实际情况。

惯导组件的脉冲输出测控系统

针对目前惯导组件脉冲输出测试过程中测试范围小、精度低、无法进行动态测试的问题,研究了一套惯导组件的脉冲输出测控系统.本系统采用USB接口技术,使用FPGA芯片采集数据,对惯导组件脉冲输出进行5 ms一次的采集,并在测控计算机中对数据进行实时显示和存储.所设计的测控系统能够对具有12路脉冲信号的惯导组件进行测试,并且同时能够对测试过程中的转台及温箱进行监测与控制,实现了动态测试.本测控系统的测试范围能够达到0.1 Hz^1 MHz,误差小于1×10-4,满足了实际测试的要求.

Real-time hyperspectral imaging for the in-field estimation of strawberry ripeness with deep learning

Strawberry is one of the popular fruits with numerous nutrients.The ripeness of this fruits was estimated using the hyperspectral imaging(HSI)system in field and laboratory conditions in this study.Strawberry at early ripe and ripe stageswere collected HSI data,coveredwavelength ranges from370 to 1015 nm.Spectral featurewavelengths were selected using the sequential feature selection(SFS)algorithm.Two wavelengths selected for field(530 and 604 nm)and laboratory(528 and 715 nm)samples,respectively.Then,reliability of such spectral featureswas validated based on support vectormachine(SVM)classifier.Performance of SVMclassification models had good resultswith receiver operating characteristic values for samples under both field and laboratory conditions higher than 0.95.Meanwhile,the spatial feature images were extracted from the spectral feature wavelength and the first three principal components for laboratory samples.Pretrained AlexNet convolutional neural network(CNN)was used to classify the early ripe and ripe strawberry samples,which obtained the accuracy of 98.6%for test dataset.The above results indicated real-time HSI system was promising for estimating strawberry ripeness under field and laboratory conditions,which could be a potential application technique for evaluating the harvesting time management for farmers and producers.

1.5MeV LIA脉冲功率系统

本文简要介绍了1.5MeV LIA脉冲功率系统的结构、组成和设计思想;给出了开关运行参数和确定开关时间抖动指标的方法、闭环系统的总抖动对加速电压相对变化的影响、脉冲功率系统各段输出波形和电压幅度的调制关系;测量结果表明,1.5MeV LIA的运行功率和时间同步满足总体设计要求。

区域地磁场的连续傅里叶分析建模方法

研究了利用快速傅里叶(FFT)拟合方法建立连续局部地磁场模型,给出了详细的计算方法。建立的局部地磁场表达式是连续的且形式十分简明,有利于地磁匹配辅助惯性导航的实现。最后,给出了某一地磁异常场的实例,用FFT拟合方法建立了局部地磁异常场模型并与传统的Taylor多项式建模方法进行了比较。仿真结果表明,FFT拟合建模方法精度明显高于Taylor多项式建模方法,可以满足地磁匹配辅助惯导对区域地磁场的要求。

谱线形成深度的理论及其应用(Ⅰ):贡献函数和谱线形成深度

本系列文章中给出了谱线形成深度理论的发展特别是其最新进展，分别叙述了与此理论相联系的贡献函数和响应函数的演化过程，讨论了此理论的应用特别是用于太阳矢量磁场空间三维结构的推导．在这第一篇文章中，叙述了与贡献函数相夫的理论，指出了应用此理论的局限性，并讨论了唯一性问题．

几个特殊点电荷系统的电力线方程

本文利用解析几何的知识和电力线上每一点的切线方向和该点场强方向一致的特点,即E×dl=0,首先建立电力线的微分方程。然后着重导出一对等量异号点电荷系统的电力方程,它对电力线的教学有一定的参考价值。

有限空间作业危害分析与防护设备的选用

针对有限空间作业风险较大,极易造成人身伤亡事故的特点,借鉴国内外有限空间作业标准并结合石油行业现状,对行业内普遍存在的危害进行分析。通过对长管正压式空气呼吸器、三角提升架、长管鼓风机和头戴式LED灯防护设备的介绍和选用对存在的危害因素进行削减,并将选用的防护设备应用于井下作业现场的储液罐清罐作业。

土壤固化剂在铁路施工道路路基处理中的应用

对道路路基掺入土壤固化剂后固化土混合料的无侧限抗压强度、水稳系数和凝结时间影响系数进行试验研究,并对试验段路基进行回弹弯沉试验和浸水膨胀量检测。试验结果表明:固化土底基层混合料的无侧限抗压强度提高24. 4%,水稳系数提高11. 8%,凝结时间影响系数提高8. 2%;土壤固化剂掺量的提高可进一步增大固化土混合料的无侧限抗压强度,且固化土基层混合料的水稳系数和凝结时间影响系数增长规律与固化土底基层混合料基本一致;道路1 d弯沉值为67. 04×10^(-2)mm,浸水膨胀量为0. 019%,说明土壤固化剂有较好的早强作用,且提高了固化土混合料的抗水浸能力。较高的无侧限抗压强度和良好的水稳定性能保证了临时道路的承载能力。

试析植筋抗拔承载力的现场检验

本文主要从某校舍安全工程教学楼加固的后锚钢筋的分析，针对植筋抗拔承载力的现场试验进行了具体地分析与探讨。

一种通过ADS/INS系统估算风速的方法

大气风场对飞行器的飞行姿态稳定和飞行参数测量等方面有着较大的影响。对风场进行相对准确的估算,在飞行控制理论研究领域和工程应用领域内均具有较高的价值。本文主要根据大气数据系统和惯导系统提供的数据,从理论上推导出一种较为简易实时的估算风场的方法,并通过Matlab进行仿真验证,证明了该种方法的可行性和准确性。最后得出一种数据准确性较高,并能够应用在实际工程实践上的估算大气风场的方法。

20世纪下半叶太湖以东淀泖湖群的围垦改造与水环境

唐宋以降,淀泖湖群地区一直是太湖流域最重要的蓄排水走廊,其畅通性和蓄水量关系到整个太湖流域的农业生产、社会经济发展和水利安全。晚清民国时期,淀泖作为太湖与黄浦江之间调蓄水柜的作用更加凸显。20世纪50年代以后,在农业追求增产和工业、城市发展的驱动下,淀泖湖群被大量围垦和辟为人工养鱼场,周边河道水系在联圩并圩的影响下也发生快速变化,而以消除内涝为目标的新圩田治理却并未达到预期效果,淀泖排水系统出现梗阻。这说明在现代工业化时期,淀泖地区仍然是整个太湖东部平原圩田治理和社会经济发展的水环境枢纽,需要结合历史经验加以治理。