Let(M,g)be a compact Riemann surface with unit area,h a smooth function on M.The Kazdan-Warner problem is that under what kind of conditions on h the equationΔu=8π-8πhe^(u) has a solution.In this survey article,we ...Let(M,g)be a compact Riemann surface with unit area,h a smooth function on M.The Kazdan-Warner problem is that under what kind of conditions on h the equationΔu=8π-8πhe^(u) has a solution.In this survey article,we shall review the development of this problem along the variational method.展开更多
Dendrowardol C(1)-a novel sesquiterpenoid,with an unprecedented 4/5/6/6 tetracyclic carbon backbone,together with two known cyclopacamphane-type sesquiterpenoids;dendronobilin I(2)and dendrobane A(3)were isolated from...Dendrowardol C(1)-a novel sesquiterpenoid,with an unprecedented 4/5/6/6 tetracyclic carbon backbone,together with two known cyclopacamphane-type sesquiterpenoids;dendronobilin I(2)and dendrobane A(3)were isolated from the stems of Dendrobium wardianum Warner.The structure of 1 was established on the basis of spectroscopic data and the absolute configuration was determined by single-crystal X-ray diffraction crystallography.The hypothetical biosynthetic pathway of 1 was postulated.Compound 1 showed no cytotoxic activity against human tumor cell lines HL-60,SMMC-7721,A-549,MCF-7,and SW480.展开更多
Time Warner Cable Inc．（简称TWC）是美国第二大有线电视公司，在有线电视产业中处于领导地位，它的有线电视网络延伸到了美国33个州，覆盖近2600万个家庭，其中有85％的家庭都集中在纽约、加尼福尼亚州、俄亥俄州和德克萨斯州等美国...Time Warner Cable Inc．（简称TWC）是美国第二大有线电视公司，在有线电视产业中处于领导地位，它的有线电视网络延伸到了美国33个州，覆盖近2600万个家庭，其中有85％的家庭都集中在纽约、加尼福尼亚州、俄亥俄州和德克萨斯州等美国主要地区。展开更多
I shall deserve the Reputation of having beene ye first to lay the grounds of two Sciences,"wrote Thomas Hobbes in 1646,"this of Optiques and yt other of natural Justice."For him,optics and politics wer...I shall deserve the Reputation of having beene ye first to lay the grounds of two Sciences,"wrote Thomas Hobbes in 1646,"this of Optiques and yt other of natural Justice."For him,optics and politics were two prongs of the same effort:to naturalize humans’relations to their world and to each other.It was Descartes’Dioptrique,handed to him by Kenelm Digby in 1637,that cleared for him the path:naturalizing humans required physicalizing vision–as Kepler taught in his own optics–and removing from nature of all cognitive entities such as"species visible and intelligible."Between 1639 and 1646 Hobbes produced three professional,innovative treatises on optics founded upon"the opinion of the excellent Monsieur Des Cartes"but,finally,diverging from it in the most crucial point.For Descartes,ridding"Matter[of all]such Descriptions…as belong but to Spiritual Beings"required a spiritual,non-material entity to interpret the physical effects of the senses.Hobbes,however,insisted that the interpretation can and should be understood physically and mechanically,for"Vision is the judgement itself.展开更多
文摘Let(M,g)be a compact Riemann surface with unit area,h a smooth function on M.The Kazdan-Warner problem is that under what kind of conditions on h the equationΔu=8π-8πhe^(u) has a solution.In this survey article,we shall review the development of this problem along the variational method.
基金This work was financially supported by the National Natural and Science Foundations of China(No.30800090)"Xi-Bu-Zhi-Guang"project(No.2009312D11017)from Chinese Academy of Sciencesthe Fund of the State Key Laboratory of Phytochemistry and Plant Resources in West China(P2010-ZZ012).
文摘Dendrowardol C(1)-a novel sesquiterpenoid,with an unprecedented 4/5/6/6 tetracyclic carbon backbone,together with two known cyclopacamphane-type sesquiterpenoids;dendronobilin I(2)and dendrobane A(3)were isolated from the stems of Dendrobium wardianum Warner.The structure of 1 was established on the basis of spectroscopic data and the absolute configuration was determined by single-crystal X-ray diffraction crystallography.The hypothetical biosynthetic pathway of 1 was postulated.Compound 1 showed no cytotoxic activity against human tumor cell lines HL-60,SMMC-7721,A-549,MCF-7,and SW480.
文摘I shall deserve the Reputation of having beene ye first to lay the grounds of two Sciences,"wrote Thomas Hobbes in 1646,"this of Optiques and yt other of natural Justice."For him,optics and politics were two prongs of the same effort:to naturalize humans’relations to their world and to each other.It was Descartes’Dioptrique,handed to him by Kenelm Digby in 1637,that cleared for him the path:naturalizing humans required physicalizing vision–as Kepler taught in his own optics–and removing from nature of all cognitive entities such as"species visible and intelligible."Between 1639 and 1646 Hobbes produced three professional,innovative treatises on optics founded upon"the opinion of the excellent Monsieur Des Cartes"but,finally,diverging from it in the most crucial point.For Descartes,ridding"Matter[of all]such Descriptions…as belong but to Spiritual Beings"required a spiritual,non-material entity to interpret the physical effects of the senses.Hobbes,however,insisted that the interpretation can and should be understood physically and mechanically,for"Vision is the judgement itself.
