In this article,we will prove that,under the differential condition,the strict pseudo_convexity and Orgega_Rheinbold pseudo_convex are equivalent.What's more,we will discuss the relation between the r_convexity an...In this article,we will prove that,under the differential condition,the strict pseudo_convexity and Orgega_Rheinbold pseudo_convex are equivalent.What's more,we will discuss the relation between the r_convexity and the analog convexity.展开更多
Rice （Oryza sativa L.） is an important food staple in most of the tropical and sub tropical countries of the world. In Uganda, rice has grown to become an important food security crop and source of cash income for t...Rice （Oryza sativa L.） is an important food staple in most of the tropical and sub tropical countries of the world. In Uganda, rice has grown to become an important food security crop and source of cash income for the majority of the rural farming communities across the country. Despite its importance, rice production has consistently remained low averaging 1.5 t/ha under farm conditions. The low production of rice is attributed to a number of production constraints. Therefore the objective of the survey was to ascertain the major production constraints in rice growing in the two sub-counties of Orum and Ogor, Otuke district. A diagnostic survey using semi- structured questionnaires was conducted in the two sub counties between July and August 2010 to gather information on the major production constraints from key informants, opinion leaders, farmers, technical and political leaderships. The findings showed that diseases were the major constraints in rice production accounting to 27% compared to other constraints. The other constraints included insect pests （23%）, weeds （21%）, drought （20%） and low prices （9%）. The major diseases encountered were rice blast （30%）, brown spot （23%）, rice yellow mottle virus （19%）, sheath rot （15%） and grain rot （13%）. Overall, diseases accounted for 79% of the yield reduction in rice. The implication of these findings therefore is that diseases and other constraints in rice production must be adequately identified for easy management to ensure sustainable rice production. More importantly, farmers should be sensitised on disease recognition, means of spread and control.展开更多
We investigate oscillation of certain second order neutral dynamic equations of Emden-Fowler type with positive and negative coefficients. We use some different techniques and apply Riccati transformation to establish...We investigate oscillation of certain second order neutral dynamic equations of Emden-Fowler type with positive and negative coefficients. We use some different techniques and apply Riccati transformation to establish new oscillatory criteria which include two necessary and sufficient conditions. Moreover, we point out that how the power γ plays its role. Some interesting examples are given to illustrate the versatility of our results.展开更多
文摘In this article,we will prove that,under the differential condition,the strict pseudo_convexity and Orgega_Rheinbold pseudo_convex are equivalent.What's more,we will discuss the relation between the r_convexity and the analog convexity.
文摘Rice （Oryza sativa L.） is an important food staple in most of the tropical and sub tropical countries of the world. In Uganda, rice has grown to become an important food security crop and source of cash income for the majority of the rural farming communities across the country. Despite its importance, rice production has consistently remained low averaging 1.5 t/ha under farm conditions. The low production of rice is attributed to a number of production constraints. Therefore the objective of the survey was to ascertain the major production constraints in rice growing in the two sub-counties of Orum and Ogor, Otuke district. A diagnostic survey using semi- structured questionnaires was conducted in the two sub counties between July and August 2010 to gather information on the major production constraints from key informants, opinion leaders, farmers, technical and political leaderships. The findings showed that diseases were the major constraints in rice production accounting to 27% compared to other constraints. The other constraints included insect pests （23%）, weeds （21%）, drought （20%） and low prices （9%）. The major diseases encountered were rice blast （30%）, brown spot （23%）, rice yellow mottle virus （19%）, sheath rot （15%） and grain rot （13%）. Overall, diseases accounted for 79% of the yield reduction in rice. The implication of these findings therefore is that diseases and other constraints in rice production must be adequately identified for easy management to ensure sustainable rice production. More importantly, farmers should be sensitised on disease recognition, means of spread and control.
基金supported by National Natural Science Foundation of China (Grant No. 11271379)Guangzhou Postdoctoral Science Research Foundation Project (Grant No. gdbsh2014003)
文摘We investigate oscillation of certain second order neutral dynamic equations of Emden-Fowler type with positive and negative coefficients. We use some different techniques and apply Riccati transformation to establish new oscillatory criteria which include two necessary and sufficient conditions. Moreover, we point out that how the power γ plays its role. Some interesting examples are given to illustrate the versatility of our results.
