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ON FACE PARTITION OF rooted OUTERPLANAR MAPS

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Chinese Science Bulletin 1989年第5期34卷 365-369页

作者：刘彦佩 Institute of Applied Mathematics Academia Sinica Beijing

A summation free formula for enumerating rooted nonseparable outerplanar maps with a face partition given is herein presented. As its corollaries, some summation free formulae for the bipartite and the simple cases are also derived. Moreover, the formula for planted plane trees according to a given vertex partition is demonstrated in a new way.

关键词： rooted map face partition functional equation enumeration.

On Global General Solutions of Complex Normal Polynomial Systems

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Science China Mathematics 1993年第4期36卷 394-407页

作者：赵晓强秦元勋 Institute of Applied Mathematics Academia Sinica Beijing 100080 PRC

In this paper, using the Strong rooted Theorem of complex polynomial systems we prove the existence of global general solutions of a class of complex polynomial systems, discuss the qualitative structure of global general solutions of normal polynomial systems, and obtain their representation theorem. Finally, we give some applications of the theorem.

关键词： eomplex polynomial system singular point at infinity strong rooted theorem global general solution.

NEW PROGRESS IN THEORY OF SURFACES DEFINED BY ORDINARY DIFFERENTIAL EQUATIONS~*

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Chinese Science Bulletin 1989年第10期34卷 800-803页

作者：秦元勋 Institute of Applied Mathematics Academia Sinica Beijing Department of MathematiesUniversity of Florida GainesuilleUSA

Here singular points of the system (E_n~*) includes both finite and infinite singular points defined by H. Poincare, but extended to complex domain.

关键词： nonlinear ordinary differential equations strong rooted theorem general integral representation theorem Hilbert number N(n).

Soil Urease Activity of Sundarban Mangrove Ecosystem, India

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Advances in Microbiology 2017年第8期7卷 617-632页

作者： Subhajit Das Dipnarayan Ganguly Abhishek Mukherjee Sabyasachi Chakraborty Tarun Kumar De Department of Marine Science University of Calcutta Kolkata India

Vertical occurrence of soil urease activity along with ammonia content from three distinct regions viz. Deep forest region (No tidal action and wave attack occurs as it is furthest from river shore and it contains maximum content of organic carbon and minimum soil salinity and silicate concentration. In this zone plenty of pneumatophores, below ground root and dense vegetation are found), rooted region (It is situated in between Deep forest region and Un-rooted region. This region contains only pneumatophores but it is devoid of long roots and vegetations. It faces wave attack and tidal action less than that of Un-rooted region) and Un-rooted region (It is closest to river shore and faces maximum wave attack and tidal action;it contains minimum organic carbon but maximum soil salinity and silicate concentration. This zone is totally devoid of any roots, pneumatophores and vegetations) of Sundarban mangrove forest ecosystem, India revealed an interesting explanation. Soil urease activity showed a decreasing pattern with increase in depth from the deep forest region of the Sundarban forest ecosystem. Soil urease activity was found to be more sensitive to soil temperature and pH rather than soil salinity. This ensured that soil urease along with the microbes present in the Sundarban forest ecosystem are more tolerant to fluctuation in salinity than that of temperature. Soil ammonia concentration was found to be directly governed by the soil urease activity [The regression equation is Ammonia in soil = -1.64 + 0.0402 Urease Activity (R-Sq = 62.9%, P < 0.001, n = 41)].

关键词： Soil Urease Activity Soil Ammonia Deep Forest Region rooted Region Un-rooted Region and Sundarban Forest Ecosystem

Stony Mountains Turn Gold

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Beijing Review 2019年第20期62卷 28-29页

作者： Wang Hairong 不详

Bunches of plump dark purple grapes hang from trellises in a vineyard in Siba Town in southwest China's Guangxi zhuang Autonomous *** the grapevines to the ground,one can see that they are rooted in stone cracks rathe... 详细信息

关键词： Bunches rooted plump ground grapevines