语义网格环境中基于本体的服务模型研究

讨论了基于本体的服务发现与获取的总线结构与星型结构,在此基础上,通过使用OWL描述逻辑以及判断服务约束是否满足,提出了服务发现与获取的具体算法,实现了资源在语义层次的融合及根据语义获取所需服务,为语义网格环境中资源如何集成,以及如何根据语义获取服务提供了一个有效途径．     

江苏省农业碳排放时序特征与趋势预测

为探讨江苏省农业碳排放时序特征及未来碳排放趋势,利用排放因子法对江苏省2000—2019年农业碳排放进行估算,并运用STIRPAT模型对2020—2030年全省农业碳排放趋势进行预测。结果表明：江苏省2000—2019年的CO₂排放当量（CO₂e）整体呈现降低-升高-降低的趋势,并在2005年达峰,估算为8 361.77万t,其中种植业、畜牧业则分别在2010年、2003年达峰,种植业排放量远高于畜牧业。农业CO₂e排放强度呈先升高后降低的趋势,2003年后排放强度逐年递减,到2019年已降至1.31 t·万元^-1;在各碳源中,水稻种植是全省农业碳排放的最大排放源,而在主要畜禽中,猪养殖过程中造成的碳排放远高于其他畜禽;预计2020—2030年,伴随城镇化发展、农业人均GDP提高和农业碳排放强度的进一步降低,全省农业CO₂e排放量仍将呈下降趋势,在减碳的同时可以兼顾农业经济高效发展。研究表明,江苏省农业已实现碳达峰,未来农业碳排放的持续降低将有利于加速全省碳中和目标的实现。     

温州农区早稻抛秧田的杂草发生特点与化学除草技术研究

温州农区早稻抛秧田杂草发生种类以稗草、矮慈菇、节节菜、异型莎草、牛毛毡为主,稗草为优势种群,杂草危害程度重于插秧田。抛秧后２ｄ杂草开始陆续出苗,抛后１０ｄ呈现出苗高峰,比插秧田早５ｄ,稗草的出苗高峰出现于抛秧后５～１０ｄ。经３年试验证明,禾大壮＋苄嘧磺隆,二氯苄和丁苄对禾本科、莎草及阔叶草均有良好防效,对水稻安全,增产幅度大。不同施药期试验表明,二氯苄和丁苄分别于抛秧后３～５ｄ和５～９ｄ使用,对水稻株高和分蘖有明显抑制作用,故安全有效用药期应为抛秧后７～１１ｄ和１１～１３ｄ。     

Evaluation of Site-Specific Weed Management Implementing the Herbicide Application Decision Support System (HADSS)

A major concern of producers has always been how to reduce the amount of inputs required for crop production while maintaining or improving yields. One area of research addressing this issue is site-specific weed management (SSWM). The objective of this research was to evaluate the possibility of using SSWM herbicide applications to reduce overall production costs when site-specific weed populations are known. Weed populations of three soybean fields (B-East, B-South, B-North), located at the Black Belt Branch Experiment Station, Brooksville, MS, were estimated in 1998 and 1999. Sampling occurred July 8–9, 1998 (8 weeks after planting), and June 30–July 1, 1999 (6 WAP). An established 10 m × 10 m Universal Transmercator (UTM) grid coordinate system was used to divide the fields into 100 m² cells, with the sample point located in the center of each cell. Optimal herbicide recommendations were obtained for each sample location within each field by subjecting the weed information to the Herbicide Application Decision Support System (HADSS). An average of the weed populations for the entire field was also subjected to HADSS to obtain an optimal recommendation for a broadcast application for comparison purposes. Data from 1998 resulted in 25% and 15% of the field not requiring a herbicide treatment for the B-North and B-South when compared to the whole-field recommendations to receive broadcast treatments. However, B-East received a no treatment recommendation for the whole-field analysis. The no treatment recommendation was attributed to the sicklepod population exceeding a level deemed economically controllable by HADSS. However, when SSWM recommendations were generated, 49% of the field received no treatment recommendation, while 51% resulted in a herbicide application as an economical choice. In 1999, glyphosate-resistant transgenic soybean was used, thereby increasing the POST herbicide treatment options available in HADSS. Herbicide treatment recommendations resulted in 100%, 56%, and 91% of the total area requiring herbicide treatments for B-East, B-North, and B-South, respectively. Comparing the projected net returns for each field can develop a better estimate of the value of SSWM. In 1998, data from the B-East resulted in a projected net return increase of $21.63 ha^–1 over that of the broadcast application. Estimated net return increased $5.42 ha^–1 at B-North, with simulated SSWM applications over broadcast applications, and $14.67 ha^–1 increase at B-South. Net returns for 1999 resulted in only a $0.32 ha^–1 increase by using SSWM for B-East, but a $21.00 and $13.56 ha^–1 increase for B-North and B-South, respectively. The extra expenses of SSWM, such as sampling and technology costs, are not included in the net returns calculations and, when included, would reduce the difference between SSWM and conventional methods. This research has demonstrated the potential value of SSWM from an economic standpoint; environmental benefits through reductions in herbicide applications are also apparent.     

Analysis of Theory and Method about the Corrosion as well as the Broken Point of the Grounding Grid

The paper studies the theory about the corrosion as well as the broken point of the grounding grid in power plants and substations. By using sensitivity analysis, failure diagnosis equation is put up through rigorous theoretical analysis. Meanwhile the problem of morbid equation is solved by introducing lowest energy theory and technique of optimiation to diagnosis equation solution of grounding grid combined with definite constraint condition and linear or non-linear objective function, the fault diagnosis equation is discussed. The results of emulation calculation and analogous experiments verify the correctness,feasibility and practicality of the theory and method.     

The Exceptional Set of Differential Polynomials of Meromorphic Functions

We prove the existence of the singular direction related to differential polynomial f'--afn with concerning exceptional set.     

渐开线圆柱齿轮剃齿过程中的根切控制

针对目前对齿轮根切的定义过于笼统的问题，从根切对齿轮轮齿强度、刚度以及对齿形精度的影响角度出发，将根切分为“有害根切”和“无害根切”。根据渐开线齿形形成原理、剃前滚齿和剃齿的齿形特点理论，分析剃前滚齿根切的产生原因，并提出运用合理控制剃齿余量来控制实际生产中剃齿的“有害根切”。相应的加工测量实验表明，所得实验结果与理论分析结果吻合较好。     

浅议小水电上网电价的制定

小水电上网电价价格与价值出现严重背离,同网不同价、一厂一价等不合理情况例得小水电事业举步维艰,制定一套调整小水电上网电价的方法非常必要。从小水电上网电价制定的几种依据入手,提出了一套小水电上网电价价格制定的步骤,并以淮阴市为例计算出了淮阴市小水电上网电价,具有一定的推广价值。     

双缸双作用隔膜泵脉动消减技术研究

研究了双缸双作用隔膜泵脉动消减技术；分析了双缸双作用隔膜泵产生脉动的原因、蓄能器对脉动的消减作用、空气室结构参数与流量脉动衰减率的关系；讨论了峰值分散技术对多联隔膜泵流体脉动的消减作用；给出了最优分散相角值的计算公式及软件计算判断方法。     

EC细网格在抚顺市一般性降水预报中的应用

利用EC细网格数值预报产品对2015年3月出现在抚顺章党站的2次一般性降水过程进行诊断分析和预报释用,结果表明:EC细网格预报的累积降水量大小不能作为判断未来降水量的直接依据,应根据EC细网格预报出的其他物理量综合判断,即850 hPa层面以下存在比较大的比湿、较长的降水持续期间、低层925～700 hPa持续的上升运动、较强的850 hPa低空急流。