不同株型玉米苗期生长,光合速率及对肥料的反应

在人工气候室中，对盆栽条件下不同熟期的紧凑型与平展型玉米比较研究表明，单株玉米对土壤养分的反应株型间无规律性差异；不同熟期玉米间存在明显的规律性差异。植株苗期生长速率及高低土壤肥力下的差异与叶片Ｎ、Ｋ含量，光俣速率及不同光强，不同ＣＯ２浓度与的反应差异间存在明显的相关性。不同品种间苗期光合速率差异明显，土壤肥力高低对玉米苗期光合速率影响很大。     

Effect of Timing and Nitrogen Fertilizer Application on Winter Oilseed Rape (Brassica napus L.). I. Growth Dynamics and Seed Yield

The field experiments conducted on the grey‐brown podzolic soil in the four growing seasons (1998–2001) at Krzeslice Farm, central‐western Poland comprised seven fertilization variants: 80_NF + 80_CAN; 80_CAN + 80_CAN; 80_AN + 80_AN; 80_NF + 50_CAN + 30_CN; 80_CAN + 50_CAN +30_CN; 80_AN + 50_AN + 30_CN (where NF – nitrofos NPK; CAN – calcium‐ammonium nitrate; AN – ammonium nitrate; CN – calcium nitrate) and control (without N) applied in split rates at the beginning of spring regrowth (80 kg N ha^?1), stem elongation (80 or 50) and flower buds visible stages (30). The yielding effect of tested fertilization variants was significant in comparison with the control (2.24 t ha^?1). The highest mean seed yield (3.64 t ha^?1) was collected from 80_AN + 80_AN and 80_CAN + 80_CAN variants. Mean values of 4 years indicate that the second N rate division (80 + 50 + 30) decreased yield, although not significantly in comparison with these two N treatments. Plants grown on these treatments have developed different patterns of growth to yield the seeds. These patterns were characterized by very high crop growth rate during flowering (above 21 g m^?2 day^?1) and negative at maturation (down to ?2.5 g m^?2 day^?1). Plants fertilized with ammonium nitrate (80_AN + 80_AN) reached maximum growth rate earlier (65 days), which lasted longer (20 days) than plants fertilized with calcium‐ammonium nitrate (71 days lasting 17.5 days). Plants grown on the control treatment reached the highest crop growth rate within 79 days (14.8 g m^?2 day^?1), which lasted 15 days.     

铁皮石斛在人工光型密闭式植物工厂的适宜光照强度

人工光型密闭式植物工厂适于高附加值植物尤其是珍贵药用植物的大规模/低成本化生产,其环境调控对珍贵药用植物的产量和质量有重要影响。笔者研究探索在控制温度、湿度、CO2浓度和光周期的条件下,光照强度对铁皮石斛(Dendrobium officinale)组培苗生长发育的影响,以期找到铁皮石斛组培阶段在人工光可控环境下的适宜光照环境。鲜重约300mg的铁皮石斛单腋芽作为外植体在温度24±1℃、湿度65±5%、光周期12h/d、及光期CO2浓度800±50μmol/mol的环境条件下,设置光照强度为37、68、92、120μmol/(m2·s)的4组试验区,并使用容积为380mL的方型聚碳酸酯组培容器在人工光型密闭式植物工厂中培育92d。组培容器的顶部留2个直径为10mm的圆孔覆盖高分子透气膜用来与容器外进行气体交换。铁皮石斛组培苗的生长发育和生理活性在光照强度为68μmol/(m2·s)时最佳,超过92μmol/(m2·s)时呈现明显的光抑制;多糖含量随着光照强度的增强而增加,超过92μmol/(m2·s)时呈下降趋势,但是68和92μmol/(m2·s)光照强度试验区的多糖含量没有显著性差异。因此,铁皮石斛组培苗在人工光型密闭式植物工厂内培育的适宜光照强度为60￣70μmol/(m2·s)。     

Respond of Stock Trading Volume to Earning Report

Earning report is a main accounting report that transmits earning information to users. It is the core of financial reports system. Earning information is significant to users' decision making. This paper studies the respond of stock trading volume to earning report and draws the curve of trading volume before and after earning report. This paper further does a regression analysis of accidental earning and abnormal return rate, and draws the relation curve of them on the earning report date to prove stock trading volume does have remarkable respond to earning report. This research is significant to either lessen small investors blindness investment and help them make reasonable forecast to markets and regulate the disclosure of listed companies.     

不同熔化速率下的电渣重熔过程数值模拟分析

电渣重熔能提高钢锭的质量,从而满足特种行业的需要,其过程伴随着复杂的物理现象,存在着磁流体流动、传热和传质以及电化学等多方面的影响。通过耦合电磁以及流动和温度方程对电渣重熔过程的三维瞬态进行了数学模拟,研究了熔化速率对重熔过程的影响。结果表明：电流密度、焦耳热和电磁力都随着熔化速率的增大而增大,当熔化速率由14.4 kg/h增加到27.0kg/h,电流密度、焦耳热和电磁力最大值的增大比例超过100%。随着熔化速率的增大,温度最大值有小幅的增加,而且速度最大值的增大幅度接近50%;金属熔池深度则由27 mm增大到38 mm,不利于保证铸坯的质量。     

THE BASIC PROPERTIES OF CONDITIONAL EQUATION WITH ACCUMULATIVE STATE

Several aspects of the conditional equation derived from the accumulative equation are discussed in detail. The results indicate that the conditional equation not only is well consistent with the principles of electronegativity and absolute hardness equalization, but also satisfies the bonding of a full -prerequisite condition, e. g. two like electronic charge species repel and unlike attract each other'. In addition these principles are in the accumulative state. Mathematically, some other aspects of the conditional equation are worth studying based on the generalization of this equation.     

Study on Design of Bio-clean Operating Room

The design of Bio-clean operating room in modern hospital is quite different from that of traditional operating room. This paper discusses three aspects of Bio-clean operating room design: air clean standard and air purification, interior equipment system and interior finish. It is hoped that this discussion will conduce to later designs.     

Tentative Research About the Macroscopic Regulating to Blast

The paper analyzes the difference of the pathogenic varieties and the relationship of the variety composition,allording to the historic material to the varieties of the main hybid fece varieties in Southeast Sichuan during 1992 to 1998.It's the first time to advance to use the camparison on rate of pathogenic isolates between norm and refrieving to define the susceptible extent of the varity.It's an scientific base to adjust the structures of the vartieties,to reach the objective of the macroscopic regulating to rice blast.     

A Thermodynamic Criteria for Evaluation of Heat Exchanger Performance

The concept of loss rate of available energy was introduced for evaluating heat exchanger performance. At the same time, the general expression of loss rate of available energy was obtained for heat exchangers of several typical. And NL criteria was recommended for evaluation of the loss rate of available energy of heat exchanger. Then. the influences of inlet temperatures ratio, heat capacity ratio of fluids, the number of heat transfer units and flow patterns of heat exchanger on ,VL criteria were also discussed.     

EXPERIMENTAL RESEARCH ON VISCOELASTICITY OF HUMAN BLOOD- WITH REFERENCE TO THE EFFECT OF CELL HEMOTOCRIT

This paper describes a part of the experiments concerning the viscoelasticity of human blood, which are based upon the theories lead by the authors. The data from the experiments are compared with those in the literatures. The effect of cell hematocrit on viscoelasticity is especially discussed and a new viscoelasticity index is defined to eliminate this effect.