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We show the role of group actions in the classification of affine lines on ${\mathbb Q}$-homology
      
We study the analogs of some of the classical partial differential equations with Δ playing the role of the usual Laplacian.
      
The study indicated that their antiproliferative activity is largely explained by the steric factors of the substituents, highlighting the role of the size and shape of the inhibitor in forming effective binding interactions with histone deacetylase.
      
However, a few studies have focused on the effect of different substances on LP of roots, and the role of radical water transport was poorly understood.
      
The role of mutualistic symbiosis in the process of pine wilt disease was also discussed.
      
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In this paper, the equations of motion of vortices in baroclinic atmosphere are derived in the light of classical hydrodynamics. Six factors determining the motion of vortices are discussed. Physical interpretation and some comments are given to the well-known steering principle. Application of these equations in the forecasting of the motion of typhoons are illustrated by three examples, and the results are better or as well as those of the synoptic forecasts. Possibility and limitation of their application...

In this paper, the equations of motion of vortices in baroclinic atmosphere are derived in the light of classical hydrodynamics. Six factors determining the motion of vortices are discussed. Physical interpretation and some comments are given to the well-known steering principle. Application of these equations in the forecasting of the motion of typhoons are illustrated by three examples, and the results are better or as well as those of the synoptic forecasts. Possibility and limitation of their application to the motion of middle-latitude vortices are also discussed.In the appendix, there are critical discussions of the role of the internal forces and the calculation of the amplitude and period of the meandering motion of typhoons in straight steering current.

本文根据流体力学的基本理论,得出了斜压大气中的涡旋运动方程。并讨论了决定涡旋运动的六个基本因子。对日常应用的高空引导观念给予比较明确的物理解释并加以修正。文中对这方程在预报台风移动的应用作了初步说明,也附带简单地谈到了中纬度系统的移动。在附录中还指出了关于系统内力作用的误解,并简单地讨论了台风运动的摆动周期和振幅。

The roles of the natural development and some properties of the soilsin this area are briefly discussed as follows:The soils are saline and calcareous in nature,in which over 70% of thetotal soluble salts are sodium chloride.Slight to moderate alkalinizationmay be developed,while the total soluble salt contents exceed 0.2%;butgenerally,there is no NaCO_3 present.The ground water table in this areais usally high,and the quantity and constituents of the salts in groundwater are directly varied with and influenced...

The roles of the natural development and some properties of the soilsin this area are briefly discussed as follows:The soils are saline and calcareous in nature,in which over 70% of thetotal soluble salts are sodium chloride.Slight to moderate alkalinizationmay be developed,while the total soluble salt contents exceed 0.2%;butgenerally,there is no NaCO_3 present.The ground water table in this areais usally high,and the quantity and constituents of the salts in groundwater are directly varied with and influenced by that contained in the abovesoils.The saline and alkali properties of soils in this area are originatedfrom the parent materials,through the action of the sea water when theywere deposited.As soon as the sea water ceased to affect,the soils as wellas the ground water are gradurally desalinized by natural leaching and thisprocess will be strengthened by the biological activities.As the desalinization of the soils is proceeded further,the ratio ofNa~+/Ca~(++)+Mg~(++)in the soil solution decreased and the amount of the exchan-geable Na on the soil colloidal complex is finally lowered.It is evident thatdesalinization also introduces the dealkalinization of the soils in this area;there is no hazard of strong alkalinization of the soils taken place throughleaching.

本文简要地说明了江苏省沿海地区盐渍土壤的自然发生过程及盐渍特性转化的规律,文中主要论点,可初步归纳如下:1、本区域的土壤,发育于盐渍性的冲积母质,土层中富含以氯化钠为主的可溶性盐类,并呈一定的“碱性”。土壤碱性表现在两方面:一方面是土壤胶体表面存在有较多的吸附性钠,另方面表现在本身具有较高的pH 值。2、在自然发生过程中,土壤盐渍性为地质过程遗留的影响;随受自然降水淋盐,河沟排水排盐及生物作用的影响,开始“脱盐、脱碱”和肥力积累过程,发育成为本区内现存的各种不同盐渍程度的土壤。3、随着土壤脱盐作用的进行,土壤盐渍的组成在变化;主要是可溶性盐阴离子中钠离子的含量淋失较速,最后降低了土壤溶液中Na~+/Ca~(++)比率。由于这种盐渍组成的改变,土壤胶体上吸收性Na~+也相应的降低,从而导致土壤的脱碱作用。因此本区土壤的脱盐不致引起土壤碱化。4、在自然发生过程中,本区域盐渍土的脱盐过程,一直是在潜水位较高的情况下进行的。在脱盐过程中,潜水位经常在临界水位以内,为本区自然脱盐过程中,最大特点;潜水动能和土壤的脱盐过程,存在着许多内在的联系。在一定地区内,一定盐渍程度、盐渍特性的土壤,则常有和其相适应的矿化潜水类型。...

本文简要地说明了江苏省沿海地区盐渍土壤的自然发生过程及盐渍特性转化的规律,文中主要论点,可初步归纳如下:1、本区域的土壤,发育于盐渍性的冲积母质,土层中富含以氯化钠为主的可溶性盐类,并呈一定的“碱性”。土壤碱性表现在两方面:一方面是土壤胶体表面存在有较多的吸附性钠,另方面表现在本身具有较高的pH 值。2、在自然发生过程中,土壤盐渍性为地质过程遗留的影响;随受自然降水淋盐,河沟排水排盐及生物作用的影响,开始“脱盐、脱碱”和肥力积累过程,发育成为本区内现存的各种不同盐渍程度的土壤。3、随着土壤脱盐作用的进行,土壤盐渍的组成在变化;主要是可溶性盐阴离子中钠离子的含量淋失较速,最后降低了土壤溶液中Na~+/Ca~(++)比率。由于这种盐渍组成的改变,土壤胶体上吸收性Na~+也相应的降低,从而导致土壤的脱碱作用。因此本区土壤的脱盐不致引起土壤碱化。4、在自然发生过程中,本区域盐渍土的脱盐过程,一直是在潜水位较高的情况下进行的。在脱盐过程中,潜水位经常在临界水位以内,为本区自然脱盐过程中,最大特点;潜水动能和土壤的脱盐过程,存在着许多内在的联系。在一定地区内,一定盐渍程度、盐渍特性的土壤,则常有和其相适应的矿化潜水类型。在自然发生过程中,随土壤的脱盐和盐渍特性的转化,潜水似亦随之发生相应的淡化和化学性质的变化。二者转化趋势,大致相符。彼此间的关系,是互相依存、互相制约的,在不断运动的过程中,似先有土壤的脱盐,而生导向潜水的淡化;但就土壤脱盐的过程言,本身同时又是潜水淡化的结果。5、在土壤脱盐的过程中,土壤盐分的动能比较复杂,一方面是全区土壤不断地脱盐,另方面是在一定的条件下,又可产生局部地区土壤表层的盐渍化。前者为本区盐渍土壤自然发生过程的实质,后者为临时性现象。此种现象,最终亦必随同潜水的转向淡化而逐渐消除。

Field experiments have been carried out in the past two years on the control of the potato late blight by dusting with a mixture of organic mercurial and hydrated lime. Started soon after the appearance of disease loci, dusting with the mixture of 1 part Seresan (2% ethyl mercuric chloride) and 9 parts hydrated lime or the same ratio of Ceresan (2.58% phenyl mercuric acetate) and hydrated lime, 5 times at 7 days interval, gave remarkable control of disease and increase in yield. As diluent, talc powder is much...

Field experiments have been carried out in the past two years on the control of the potato late blight by dusting with a mixture of organic mercurial and hydrated lime. Started soon after the appearance of disease loci, dusting with the mixture of 1 part Seresan (2% ethyl mercuric chloride) and 9 parts hydrated lime or the same ratio of Ceresan (2.58% phenyl mercuric acetate) and hydrated lime, 5 times at 7 days interval, gave remarkable control of disease and increase in yield. As diluent, talc powder is much inferior to the hydrated lime in field performance. Laboratory test of sporangium germination by Petri dish method have shown, however, that neither calcium ion nor hydroxyl ion influence the toxicity of mercurials. The role of lime in the control of potato late blight by the dust mixture must be sought from a different angle. LD50 of ethyl mercuric chloride, phenyl mercuric acetate and copper sulfate for the sporangia of Phytophthora infestans have been found to be 0.02, 0.058 and 0.15 ppm respectively.

两年来用有机汞消石灰混合粉防治馬鈴薯晚疫病的田間試驗获得了显著的效果。在发生中心病株时开始用1:9西力生消石灰或賽力散消石灰每7天撒佈1次,共撒4—5次可以大大地抑制病害的蔓延,从而提高产量。西力生和賽力散的防病效果相近。填充剂的比較上,滑石粉远逊于消石灰。石灰的鈣素或碱性不影响汞化物的杀菌力。抑制孢子囊萌发的有效浓度的室內测定,得到的抑菌力強度順序为西力生(折成氯化乙基汞)>賽力散(折成醋酸苯汞)>硫酸銅。LD50各为0.02、0.058、0.15 ppm。温室接种試驗指出有机汞粉剂經水冲洗后防病作用下降。

 
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