Regulation and Genetic Analysis of Leaf Source Capacity in Rice

The highest value of photosynthetic rate and active photosynthesis duration in flag leaves could be increased in a range of 3.55% and 3 d by dressing N (112.5 kg/ha) at heading stage in hybrid rice variety cv. Shanyou63 compared with control (no dressing N at heading), respectively. This resulted in the 7.93 percentage and 5.70 percentage increases of its leaf source capacity (LSC) and yield, respectively. Furthermore, genetic analysis of LSC was made by 4 × 4 incomplete diallel cross-design with 4 sterility lines and 4 resilience lines. The results showed that hB2 and hN2 in LSC for rice were higher than 70 percentage and 30 percentage, respectively, suggesting that it may be used as an index for selecting varieties with high photosynthetic efficiency in rice breeding. There were the similar effects of the additive and non-additive variations on LSC in hybrid rice. LSC was mainly influenced by sterility line and resilience interactions. The adding effect value of general combining ability for its parents may be used to forecast the phenotype of LSC in hybrid rice.

Relation between Economic Development Level and Resource and Environment Carrying Capacity of Central Area of Yunnan Province Based on Decoupling Analysis

Based on the decoupiing theory and method, an indicator system was built for the relation between economic development level and resource and environment carrying capacity. And the study was carried out on decoupling degree and temporal changes of economic development level and resource and environment carrying ca- pacity in the central area of Yunnan Province. Results indicated that （i） the economic development level and resource and environment carrying capacity in the central area of Yunnan Province mainly experienced strong decoupling, weak decoupling, and ex- pansive negative coupling, and in general it was strong decoupling, and it took on re- verse ＂N＂ in temporal changes. （ii） Change rate of economic development level in the central area of Yunnan Province was greater than zero, but the amplitude of change was not large, while the change rate of resource and environment carrying capacity was negative in 2007-2008, and it was positive in the rest years; from 2007, it took on gradual expansion trend, and scissors difference gradually increased after experi- encing reverse ＂V＂ change. （iii） The strong decoupling was the main situation and it reached the peak value in T5 period and T6 pedod.

Non-Euclidean Geometry and Regulated Characteristics of Limited Capacity Power Supply

The restriction of load power, two-valued regulation characteristic, and interference of several loads are observed in power supply systems with a limited capacity of voltage sources. In this paper, the definition of regime in an invariant form through different parameters, of changes of transformation ratio and voltage load is grounded for these circuits with two loads. The approach for interpretation of changes or ＂kinematics＂ of load regime is presented by using the conformal and hyperbolic plane. To simplify the task and reveal the basic moments of influence of the limited source power, the static regulation characteristics and idealized models of voltage converters are considered. Geometrical interpretation of a simplified model of multichannel power supply system allows basing the definition of operating regime parameters. Results can be useful for electric circuit theory education and for voltage coordinated control of given loads. Non-Euclidean geometry is a new mathematical apparatus in the electric circuit theory, adequately interprets ＂kinematics＂ of circuit, and provides a validation for the introduction and definition of the proposed concepts. From the methodological point, the presented approach is applied for a long time in other scientific domains, as mechanics and biology.