捕捉派生商机

有一位金融界的职员,立志要读中国人民银行总行的研究生,三大部《中国金融史》几乎被他翻烂了,可是连考数年都未能如愿以偿。然而,在这期间不断有朋友拿一些古钱向他请教,起初他还能不厌其烦地细心解释,后来,朋友、朋友的朋友来多了。

“生成”范式启示下的《传播学概论》教学革新

"生成"观念向多领域扩展的过程深深影响了社会传播实践,处于动态变化之中的复杂世界在科学思维方式的观照中接近清晰,具有"基因"和"派生"特点的社会传播情境在改变社会传播实践的同时也促动《传播学概论》教学模式向"弹性预设"和"过程随机"的转变。

Conformal Invariance and Noether Symmetry, Lie Symmetry of Birkhoffian Systems in Event Space

This paper focuses on studying a conformal invariance and a Noether symmetry, a Lie symmetry for a Birkhoffian system in event space. The definitions of the conformal invariance of the system are given. By investigation on the relations between the conformal invariance and the Noether symmetry, the conformal invariance and the Lie symmetry, the expressions of conformal factors of the system under these circumstances are obtained. The Noether conserved quantities and the Hojman conserved quantities directly derived from the conformal invariance are given. Two examples are given to illustrate the application of the results.

Phytoplankton size class derived from phytoplankton absorption and chlorophyll-a concentrations in the northern South China Sea

A previously developed model was modified to derive three phytoplankton size classes (micro-, nano-, and pico-phytoplankton) from the overall chlorophyll-a concentration, assuming that each class has a specific absorption coefficient. The modified model performed well using in-situ data from the northern South China Sea, and the results were reliable and accurate. The relative errors of the size-fractioned chlorophyll-a concentration for each size class were: micro-:21%, nano-:41%, pico-:26%, and nano+pico:23%. The model was then applied on ocean color remote sensing data to examine the distribution and variation of phytoplankton size classes in northern South China Sea on a large scale.

Mineral Composition and Weathering of Soils Derived from Xiashu Loess

Mineralogical, physical and chemical analyses of the soils derived from Xiashu loess were carried out. The primary minerals of these soils were found to be mainly composed of light minerals, such as quartz, feldspar and mica, with traces of heavy minerals. Clay minerals, more complicate in composition, were dominated by hydromica, accompanied by smectite, vermiculite, chlorite, kaolinite, 2:1/1:1 randomly interstratified minerals and small amounts of quartz, goethite, lepidocrocite and hematite, Clay minerals were characterized by low crystallinity and fine particle size. In light of the quartz/ feldspars ratio of the 0.01-0.05mm silt fraction, and the clay mineral composition, the freeness of iron oxide, and the silica/ sesquioxide and silica/ alumina ratios in < 0.002mm clay fraction, it is concluded that the weathering intensity of these soils was lower than those of red soil and yellow earth, but higher than that of brown earth, and that the soil allitization, depotassication and hydroxylation of clay minerals increased from west to east and from north to south geographically. However, this general tendency did not coincide exactly with the gradual alteration of the geographic coordinates, and in some places, a reverse tendency also appeared, which could be attributed to the influence of some soil forming factors such as parent material and microtopography.

Variable Separation for(1+1)-Dimensional Nonlinear Evolution Equations with Mixed Partial Derivatives

We present basic theory of variable separation for (1 + 1)-dimensional nonlinear evolution equations withmixed partial derivatives.As an application,we classify equations u_(xt)=A(u,u_x)u_(xxx)+B(u,u_x) that admits derivative-dependent functional separable solutions (DDFSSs) and illustrate how to construct those DDFSSs with some examples.

STUDY ON MIXIS POTENTIAL OF ROTIFER RESTING EGGS ( BRACHIONUS PLICATILIS ) WITH DIFFERENT COLLECTION TIMES AND DIFFERENT PRESERVATION PERIODS

The present study investigated the possible changes in the mixis potential of rotifer resting eggs produced by a single stock of Brachionus plicatilis and collected and preserved annually from 1985-1998. Several clones derived from each batch of resting eggs were cultured under the same conditions for 21 days. The percentage of clones appearing resting eggs and the average yield of resting eggs produced from each clone were recorded and statistically analyzed to find the differences between the mixis potential of those resting egg batches. Results showed that different batches of resting eggs had different mictic levels among their descendent clones; but no regular relationship was found between the mixis potential of resting eggs and their collection times/preservation periods. Several internal and external factors that might affect the mixis potential of resting eggs were discussed.

Generalized Normal Derivatives and Their Applications in DDMs with Nonmatching Grids and DG Methods

A class of normal-like derivatives for functions with low regularity defined on Lipschitz domains are introduced and studied.It is shown that the new normal-like derivatives,which are called the generalized normal derivatives,preserve the major prop- erties of the existing standard normal derivatives.The generalized normal derivatives are then applied to analyze the convergence of domain decomposition methods (DDMs) with nonmatching grids and discontinuous Galerkin (DG) methods for second-order el- liptic problems.The approximate solutions generated by these methods still possess the optimal energy-norm error estimates,even if the exact solutions to the underlying elliptic problems admit very low regularities.

The Image of Polish Women in the Early 1950s

Over the past decades, there were questions often asked： What is education？ What is it purpose in the world whether it helps an individual or not to understand himself and connect his views with existing beliefs and critical thinking about education to deal with daily practical challenges enable in a new way. The founder of instrumentalism philosophical school, John Dewey remarks that knowledge is practical instrument that purpose must be to solve all problems that a person encounters during his/her lifetime. According to instrumentalism theoretical concepts, theories are instruments by means of that relationship with surrounding world is established （communication becomes possibleS. Representatives of traditional epistemology make distinct difference between ＂world＂ and ＂mind＂. In accordance with Dewey＇s genetic epistemology mind, constitutes the result of living being-environment relationship as the universe is defined by our mind and the development of a human＇s knowledge is adaptive response to the environment.

Education and Democracy

Over the past decades, there were questions often asked： What is education？ What is it purpose in the world whether it helps an individual or not to understand himself and connect his views with existing beliefs and critical thinking about education to deal with daily practical challenges enable in a new way. The founder of instrumentalism philosophical school, ]ohn Dewey remarks that knowledge is practical instrument that purpose must be to solve all problems that a person encounters during his/her lifetime. According to instrumentalism theoretical concepts, theories are instruments by means of that relationship with surrounding world is established （communication becomes possible）. Representatives of traditional epistemology make distinct difference between ＂world＂ and ＂mind＂. In accordance with Dewey＇s genetic epistemology mind, constitutes the result of living being-environment relationship as the universe is defined by our mind and the development of a human＇s knowledge is adaptive response to the environment.

Secondary Metabolites of a Deep Sea Derived Fungus Aspergillus versicolor CXCTD-06-6a and Their Bioactivity

In order to obtain novel secondary metabolites, a deep sea inhabiting fungus Aspergillus versicolor CXCTD-06-6a was investigated. One new diketopiperazine brevianamide W(1a), as well as five known diketopiperazine alkaloids, diketopiperazine V(1b), brevianamide Q(2), brevianamide R(3), brevianamide K(4), and brevianamide E(5), were isolated from the Et OAc extract of the fermentation broth. Their structures were elucidated by spectroscopy techniques(NMR, MS). The six compounds exhibited moderate radical scavenging activity against DPPH with clearance ratio of 55.0%(1a and 1b), 53.7%(2), 46.2%(3), 61.4%(4) and 19.3%(5) at a concentration of 13.9 μmol L-1, respectively; while the positive control ascorbic acid showed a ratio of 70.3% at the concentration of 28.4 μmol L-1.

Impact of life and inspiration- Monet＇s back garden era

Impressionist Claude Monet was the most representative painter; he is not only the founder and terminator of Impressionism, but also the opener of modem painting. The artistic vitality of his life is extremely strong, unrivaled with an amazing number of works of Impressionism. Among the legacy, ＂classic＂ and ＂existence＂ works make up the most. The 1890s is the dividing line of Monet＇ s two periods of his creative career. It is also his most focused era of creation, called Monet back garden world＂ , where his works of all forms come out.

谈谈法语科技词汇的“场”

谈谈法语科技词汇的“场”首都师范大学外语学院戴达民词在词汇体系中不是孤立的。一些词由于某方面的特殊关系而结成某种类型的词群，这就形成了语言学中定义的“词汇场”，如由于联想关系结成的“联想场”，由于派生关系结成的“派生场”，由于语音关系结成的“语音场”...

Gorensteinness, homological invariants and Gorenstein derived categories

Relations between Corenstein derived categories, Gorenstein defect categories and Gorenstein stable categories are established. Using these, the Gorensteinness of an algebra A and invariants with respect to recolle- ments of the bounded Gorenstein derived category Dgbp（A-mod） of A are investigated. Specifically, the Goren- steinness of A is characterized in terms of recollements of Dbp（A-mod） and Corenstein derived equivalences. It is also shown that Cohen-Macaulay-finiteness is invariant with respect to the recollements of D^p（A-mod）.

Koszul Differential Graded Algebras and BGG Correspondence II

The concept of Koszul differential graded (DG for short) algebra is introduced in [8].Let A be a Koszul DG algebra.If the Ext-algebra of A is finite-dimensional,i.e.,the trivial module A k is a compact object in the derived category of DG A-modules,then it is shown in [8] that A has many nice properties.However,if the Ext-algebra is infinitedimensional,little is known about A.As shown in [15] (see also Proposition 2.2),A k is not compact if H(A) is finite-dimensional.In this paper,it is proved that the Koszul duality theorem also holds when H(A) is finite-dimensional by using Foxby duality.A DG version of the BGG correspondence is deduced from the Koszul duality theorem.

Resistance in hybrid derivatives of Lycopersicon accessions against leaf caterpillar, Spodoptera litura Fab.

Four tomato accessions, namely Ac 238, Roma, Seijima Jeisei and Varushanadu Local selected from preliminary screening of 321 accessions and their hybrid derivatives, namely HYtF： （Varushanadu Local × Ac 238）, HY2F1（Varushanadu Local × Roma）, HY3F1 （Ac 238 × Roma） （first generation）, HY1F2, HY2F2 and HY3F2 （second generation） were evaluated for their resistance in comparison with a susceptible check, 1979 against the leaf caterpillar, Spodoptera litura Fab. both under field and laboratory conditions at Annamalainagar, Tamil Nadu, India. In the field evaluation, accession Seijima Jeisei and hybrid HY3F1 recorded the minimum larval population. In glasshouse and laboratory studies, Seijima Jeisei was the least preferred by S. litura for both feeding and oviposition. The hybrid HYsF： exerted pronounced antibiosis effect on S. litura. Among the various biophysical and biochemical bases of resistance, contents of reducing sugar and phenol were found negatively correlated with S. litura larval feeding. Among the hybrids, HY3F1 and HY3F2 and the parent Seijima Jeisei recorded higher fruit yield per plant in both seasons. Considerable variation in the resistance traits of the hybrids was observed when compared with the parents.

A note on the equivalence of m-periodic derived categories

Let A and B be finite-dimensional algebras over a field k of finite global dimension. Using some results of Gorsky in "Semi-derived Hall algebras and tilting invariance of Bridgeland-Hall algebras",we prove that if A and B are derived equivalent,then the corresponding m-periodic derived categories are triangulated equivalent.

Bounded derived categories of very simple manifolds

A non-representable cohomological functor of finite type of the bounded derived category of coherent sheaves of a compact complex manifold of dimension greater than one with no proper closed subvariety is given explicitly in categorical terms.This is a partial generalization of an impressive result due to Bondal and Van den Bergh.

A Parameterization of the Canonical Bases of Affine Modified Quantized Enveloping Algebras

For a symmetrizable Kac-Moody Lie algebra g, Lusztig introduced the corresponding modified quantized enveloping algebra˙U and its canonical basis˙B given by Lusztig in 1992. In this paper, in the case that g is a symmetric Kac-Moody Lie algebra of finite or affine type, the authors define a set M which depends only on the root category R and prove that there is a bijection between M and ˙B, where R is the T^2-orbit category of the bounded derived category of the corresponding Dynkin or tame quiver. The method in this paper is based on a result of Lin, Xiao and Zhang in 2011, which gives a PBW-type basis of U^+.