从牛顿和奈尔经商谈起

 尽管许多科学史家对于那些为数不多的物理学大师经商一事,仅仅是只言片语,或者缄口不言、讳莫如深,但笔者为了“把凝固的文化激活”,特以艾萨克·牛顿(IssacNewton,1642～1727)和路易·奈尔(LouisEug埁ｎｅＦ啨ｌｉｓＮ啨ｅｌ,1904～2000)为例,简要谈谈著名物理学家经商的故事,并由此引发了一番深沉的反思。牛顿经商的目的“站在巨人肩上”的英国大物理学家牛顿,自从于1667年春重返剑桥大学,经过多年研究后,虽然在经典力学、光学等领域内作出了卓越的贡献,但仍然过着紧巴巴的日子。     

Direct Observation of Non-covalent Complexes for Phosphorylated Flavonoid-protein Interaction by ESI

Diethyl flavon-7-yl phosphate was synthesized by modified Atheron-Todd reaction. The result of ESI shows that the phosphated flavonoids possess stronger binding affinities toward proteins such as myoglobin, insulin and lysozyme and are easier to form the non-covalent complexes with them.     

会议通报

中原部分省示范高中联合体各成员学校代表于2008年11月21、22日在河南省邓州市一高召开联合体第五次联谊会。参加会议的学校代表分别来自灵宝市一高、孟津县一高、温县一中、扶沟高中、漯河市第四高中和邓州市一高。代表们均为各学校校长、副校长、主任和高三、高     

Chitosan-immobilized Palladium Complex：a Green and Highly Active Heterogeneous Catalyst for Heck Reaction

A green heterogeneous catalyst for Heck reaction-chitosan-immobilized palladium complex was prepared.The catalyst exhibits high activity and stereoselectivity under the moderate reaction conditions.The catalyst can be separated easily from the reaction mixture and reused after washing.Under the suitable reaction conditions,the cross-coupling of iodobenzene (ArI) with acrylic acid (AA) or acrylate can be achieved 93.3% or 99% yield of trans-cinnarnic acid or trans-cinnamic ester.     

Dioxygen Affinities and Biomimetic Catalytic Oxidation Performance of Transition-metal Complexes with Unsymmetrical Bis-Schiff Bases

Bis-Schiff base complexes as mimetic monooxgenase have been extensively reported1, 2. The bis-Schiff bases transition-metal complexes modified by crown ethers ring or pseudo-macrocylic polyethers have significantly improved dioxygen affinities and biomimetic catalytic performance in comparison with uncrowned analogues3, 4. However, most of them were symmetric and oxacrown ether substituted, the bis-Schiff bases bearing an azacrown ether, with special configuration and possibility to approach…     

简讯

3月10日,中原省级示范高中联合体成员学校在山西省昔阳县大寨旅行社召开了题为:学大寨精神,看山西风光,扬中原文化,研备考方略会议。会上,昔阳中学校长李银元介绍了昔阳中学高考21连冠的经验,相互交流了第一次联考成绩,研讨了下阶段备考方     

基于联合体双方异质性特征的EPC项目控制权配置模型研究

为确保联合体双方各自利益不受损的同时,实现项目效益最大化,EPC(Engineering-Procurement-Construction)项目控制权的合理配置成为关键。在考虑联合体双方异质性特征的基础上,构建EPC项目特定控制权与剩余控制权的配置模型,并对模型进行理论推导与假设检验。研究发现：联合体牵头者的身份能够有效抑制自利性投入行为;较高的决策偏好度会诱发自利性投入行为;特定控制权与剩余控制权配置区间的增加均会激发联合体双方的项目性投入;提高风险承受度而降低风险偏好度有利于减少设计方的自利性投入。研究成果为具有异质性特征的联合体成员间控制权的合理配置提供对策。     

“阶级利益联合体”与“人类命运共同体”

人类社会经历了从相互隔绝到相互交流和融合的过程。资本主义的诞生促使西方社会抛弃了中世纪的遗产,进入了按照资本主义逻辑改造世界的过程。资本主义催生出来的是以优劣性、排他性、等级性为特征的资产阶级利益联合体。资产阶级利益联合体是以中心地带对边缘地带的剥夺作为代价的。马克思恩格斯把资产阶级利益联合体的本质揭示出来了,他们提出了无产阶级利益联合体思想,继而更进一步提出自由人联合体的思想。自由人的联合体就是要超越资本主义“物统治人”的性质,实现人的全面发展。伴随着全球化、网络化、信息化的演进,人类社会已经进入了休戚与共的关联状态,排他性、等级性、优劣性的文明观已经与这个时代格格不入。与此同时,各种各样的全球议题此起彼伏。正是在这一历史大势下,习近平创造性地提出了“人类命运共同体”的思想。     

Controlling disease spread on networks with feedback mechanism

Many real-world networks have the ability to adapt themselves in response to the state of their nodes. This paper studies controlling disease spread on network with feedback mechanism, where the susceptible nodes are able to avoid contact with the infected ones by cutting their connections with probability when the density of infected nodes reaches a certain value in the network. Such feedback mechanism considers the networks' own adaptivity and the cost of immunization. The dynamical equations about immunization with feedback mechanism are solved and theoretical predictions are in agreement with the results of large scale simulations. It shows that when the lethality $\alpha$ increases, the prevalence decreases more greatly with the same immunization $g$. That is, with the same cost, a better controlling result can be obtained. This approach offers an effective and practical policy to control disease spread, and also may be relevant to other similar networks.     

Coherent excitons at different orientation arrangements of local transition dipole moments in circular light-harvesting complexes

The coherent exciton plays an important role in the photosynthetic primary process, and its functions are deeply dependent on the orientation arrangements of local transition dipole moments (TDMs). We theoretically and systematically study the physical property of the coherent exciton at different orientation arrangements of the local TDMs in circular light-harvesting (LH) complexes. Especially, if the orientation arrangements are different, the delocalized TDMs of the coherent excitons and the energy locations of the optically active coherent excitons (OACEs) can be obviously different, and then there are more manners to capture, store and transfer light energy in and between LH complexes. Similarly, if the orientation arrangements are altered, light absorption and radiative intensities can be converted fully between the OACEs in the upper and lower coherent exciton bands, and then the blue and red shifts of the absorption and radiative bands of the pigment molecules can occur simultaneously at some orientation arrangements. If the systems are in the vicinities of the critical orientation arrangements, the weak static disorder or small thermal excitation can destroy the coherent electronic excitations, and then the coherent exciton cannot exist any more.