Two I-h-symmetry-breaking C-60 isomers stabilized by chlorination

通讯作者地址: Xie, SY (通讯作者), Xiamen Univ, State Key Lab Phys Chem Solid Surfaces, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China 地址: 1. Xiamen Univ, State Key Lab Phys Chem Solid Surfaces, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China 2. Xiamen Univ, Dept Chem, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China 电子邮件地址: [email protected] abiding surprise in fullerene science is that I-h-symmetric buckminsterfullerene C-60 (ref. 1) (I-h-C-60 or C-#1,812(60), the nomenclature specified by symmetry or by Fowler's spiral algorithm(2)) remains the sole C-60 species experimentally available. Setting it apart from the other 1,811 topological isomers (isobuckminsterfullerenes) is its exclusive conformity with the isolated-pentagon rule(3), which states that stable fullerenes have isolated pentagons. Although gas-phase existence of isobuckminsterfullerenes has long been suspected(4-7), synthetic efforts have yet to yield successful results. Here, we report the realization of two isobuckminsterfullerenes by means of chlorination of the respective C-2v-and C-s-symmetric C-60 cages. These chlorinated species, (C60Cl8)-C-#1,809(1) and (C60Cl12)-C-#1,804(2), were isolated in experimentally useful yields. Structural characterization by crystallography unambiguously established the unique pentagon-pentagon ring fusions. These distinct structural features are directly responsible for the regioselectivity observed in subsequent substitution of chlorines, and also render these unprecedented derivatives of C60 isomers important for resolving the long-standing puzzle of fullerene formation by the Stone-Wales transformation scheme(8-11).NNSF of China,20525103 ,20531050 ,20721001 , 20571062 ,20425312 973 Program 2007CB81530

covert channel based on igmpv2

目前IP组播技术应用越来越广泛,其应用的协议是IGMP,该协议不断完善,版本不断升级,安全性也得到了提高.但是,在目前应用最广的IGMPv2中,可以实现隐蔽通道,最明显的是协议包中的"路由器检测选项"字段和"最大响应时间"字段.该文主要针对如何使用这两个字段实现隐蔽通道加以讨论.介绍了隐蔽通道和IGMP的基本概念,说明了该隐蔽通道的实现原理,描述了软件设计,最后对该方法进行了分析

complex covert channel detection based on chain analysis methodology

在研究隐蔽通道的检测方法时,可以将隐蔽通道分成两大类:单一隐蔽通道和复合隐蔽通道.复合隐蔽通道具有了跨越多主机的特点,简单的主机入侵检测体系结构很难对此进行检测,而数据融合技术可以有效地解决这个问题.文中提出了基于数据融合思想的链路分析法,并对复合隐蔽通道的特点、链路分析法检测复合隐蔽通道的理论以及软件的设计进行描述

Soil physicochemical properties and influencing factors on Xiaoqin Island

belt transect and sample methods． Pearson correlation analysis，one-way ANOVA analysis and least significant difference (LSD) multiple comparison based on SPSS 24.0 were used to study the statistical characteristics of soil physical measured and chemical properties and influencing factors on Xiaoqin Island． The average soil gravel ratio and water content are 20.04% and 7.35%，respectively． The average values of ammonium nitrogen，available potassium，available phosphorus and organic matter are 23.67，212.77，16.15mg /kg and 28.4g/kg，respectively，which is cdassified as the fifth，first，third and third grade，respectively． However，most of soil belongs to the third grade． Organic matter correlated positively in high significants with water content，ammonium nitrogen and available phosphorus． The physical and chemical properties of soil are mainly affected by vegetation and aspect． This profound study on one of Miaodao Islands is aimed to provide knowlege for the ecological protection and development of the island

Effect of scraping on hypertensive ischemic stroke based on "Qi Circulation" theory (基于“一气周流”理论刮痧干预高血压缺血性脑卒中的疗效观察)

Objective To observe the clinical effects of scraping on hypertensive ischemic stroke based on the theory of " Qi Circulation " . Methods Totally Sixty patients with hypertensive ischemic stroke who met the inclusion criteria were randomly divided into observation group and control group, with 30 patients in each group. All patients received conventional drugs and rehabilitation nursing, and patients in the observation group were treated with a 30-45 minutes of meridian scraping treatment based on "Qi Circulation " theory, once a week for 4 weeks. The changes of blood pressure, homocysteine (Hcy), matrix metalloproteinase-9(MMP-9) and blood lipid indexes including total cholesterol (TC), triglyceride (TG), high-density lipoproteincholesterol(HDL-C) and low-density lipoproteincholesterol(LDL-C) before and after intervention were compared between the two groups. Results Level of blood pressure, Hcy, TC, TG and LDL-C in 2 groups were decreased after intervention (P＜0. 05), better improvement was reported in the observation group than that in the control group (P＜0. 05). Conclusion Scraping based on the theory of "Qi Circulation" can effectively reduce blood pressure, Hcy, MMP-9, TC, TG, LDL-C levels in patients with prehypertensive ischemic stroke, and can be promoted and applied as a safe and effective adjuvant therapy. (目的 观察基于“一气周流”理论刮痧干预高血压缺血性脑卒中的临床疗效。方法 将符合纳入标准的60例高血压缺血性脑卒中患者随机分为观察组和对照组, 各30例。对照组给予常规药物及康复护理对症支持治疗; 观察组在对照组基础上基于“一气周流”理论, 选择相应经络刮痧, 每次45～60min, 每周1次, 两组疗程均4周。比较两组患者干预前后血压、同型半胱氨酸(Hcy)、基质金属蛋白酶-9(MMP-9)和血脂［总胆固醇(TC)、甘油三酯(TG)、高密度脂蛋白胆固醇(HDL-C)、低密度脂蛋白胆固醇(LDL-C)］变化情况。结果 两组患者血压、Hcy、TC、TG、LDL-C均较干预前降低, 差异有统计学意义(P<0. 05), 且观察组的下降幅度大于对照组(P<0. 05)。结论 基于“一气周流”理论刮痧可有效降低预高血压缺血性脑卒中患者血压、Hcy、MMP-9、TC、TG、LDL-C水平, 可作为临床安全、有效的辅助手段推广应用。

C60异构体的氯化物及其衍生物和合成与分离方法

申请号：200810070717.8 申请日：2008.03.07 名称：C60异构体的氯化物及其衍生物和合成与分离方法 公 开(公告)号：CN101274756公开(公告)日：2008.10.01 主分类号：C01B31/02(2006.01)I 分案原申请号： 分类号：C01B31/02(2006.01)I 申请(专利权)人：厦门大学 地 址：361005福建省厦门市思明南路422号 发 明 (设计)人：谢素原;黄荣彬;韩 晓;谭元植;廖照江;钱卓真;梁 华;陈睿婷;朱 峰;高志勇;郑兰荪 专利 代理 机构：厦门南强之路专利事务所 代理人：马应森C60异构体的氯化物及其衍生物和合成与分离方法，涉及C60异构体。提供两种C60异构体的氯化物#1809C60Cl8和#1804C60Cl12，C60异构体的氯化物#1809C60Cl8的衍生物#1809C60Cl4(C6H5)4 和#1809C60(OCH3)8，C60异构体的氯化物#1804C60Cl12的衍生物#1804C60(OCH3)12；以及两种C60 异构体的氯化物#1809C60Cl8和#1804C60Cl12的合成与分离方法，C60异构体的氯化物#1809C60Cl8 的衍生物#1809C60Cl4(C6H5)4的合成方法，C60异构体的氯化物#1809C60Cl8的衍生物#1809C60 (OCH3)8的合成方法，C60异构体的氯化物#1804C60Cl12的衍生物#1804C60(OCH3)12的合成方法

安西自然保护区生态补偿类比与标准研究

一、课题来源与背景 该课题为甘肃省环境保护厅2012年度省环境保护科技计划项目“安西自然保护区生态补偿类比与标准研究”(GSEP-2012-13)。项目背景：近几年来,安西自然保护区内先后有数项国家重点建设工程进行施工或者投产运行,建设前期就工程穿越保护区生态补偿资金事宜,一直是建设者、施工方和保护区三家争议的话题。至目前,国家尚无一部关于自然保护区生态补偿的标准,保护区只能依据甘肃省草原行业生态补偿标准来进行协商补偿,造成补偿资金的争议和资金额度不足以恢复原有生态。项目以西气东输三线工程等已建和在建工程为例,对工程穿越安西自然保护区生态补偿进行定量研究,最终编制《甘肃安西极旱荒漠国家级..

C76Cl34: High Chlorination of the Inherent Chiral Fullerene with a Helical Configuration

通讯作者地址: Xie, SY (通讯作者), Xiamen Univ, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Peoples R China 地址: 1. Xiamen Univ, State Key Lab Phys Chem Solid Surfaces, Xiamen 361005, Peoples R China 2. Xiamen Univ, Dept Chem, Coll Chem & Chem Engn, Xiamen 361005, Peoples R China 电子邮件地址: [email protected] the smallest chiral fullerene in conformity with the Isolated Pentagon Rule (IPR), D-2-symmetric C-76 has been chlorinated with iodine monochloride to form C76Cl34, a highly chlorinated derivative. Its structure with the chiral cage enwrapped by a helical chlorine pattern has been established using single-crystal X-ray diffraction analysis. The high chlorination and its implication for constructing novel chiral fullerene-based materials are discussed.Wuhan University for HPLC, NNSF of China 20525103, 20531050, 20721001, 973 Program 2007CB81530

荒漠地表生物结皮形成机制及其生态功能研究

该项目研究了生物结皮的种类组成、宏观分布及其环境特征,沙漠生物结皮形成机制、对地表稳定性的作用、对种子植物多样性的影响、对降水渗入的影响,生物结皮的光合与生理特征、微结构发育特征,结皮的有关物种进行培养、进行室外内及野外试验。构建了适用于冷沙漠的生物结皮指数BSCI,及沙漠生物结皮空间分布特征;提出了适度干扰有利于荒漠种子植物多样性观点;对沙漠生物结皮年固氮量进行了估算;揭示了生物结皮微结构及其演替规律;提出了低营养细菌、荒漠藻类及荒漠藓类植物的适宜培养条件