158 research outputs found

    试论高速公路投融资中的PPP模式

    Get PDF
    当前经济发展形势、市场环境风云变幻,有诸多不确定影响因素,地方的财政预算方面也比较有限,所以高速公路投融资有一些限制。本文主要从理论上分析高速公路项目建设及融资情况,并就高速公路投融资的发展现状及PPP模式在高速公路建设中应用的优势进行探讨,最后,探究PPP融资模式的各阶段划分以及在高速公路投融资中的具体应用策略

    Design and Implementation of Customer Comprehensive Service System for XMBTN

    Get PDF
    在当前全球普及电子商务的趋势下,市场主动权倾向于买方。选择空间的扩大、购买渠道的扩宽以及日渐成熟的消费者心态,使得客户很难再对某一种商品盲目的保持绝对的忠诚。每一家企业都在努力掌握客户信息、增进与客户的关系、想方设法提高客户满意度以求占领更多市场份额,提升利润,降低成本。在这种情况下,要使企业在竞争中占有绝对的优势,立于不败之地,就必须找到一种全新的经营理念和策略,对其内部和外部资源进行统一的整理。 CRM系统可以用来优化客户管理系统之间的业务关系,其实质是建立“以客户为中心”的企业文化,从而提高企业的市场营销,销售和客户服务等等领域的密切合作。通过为客户提供量身定制的服务,以提高客户满意度...With the popularity of e-commerce in the world and the constant improvement of the socialist market, the buyer gradually grasp the initiative in the market. Select the space to expand, purchase channel widening and increasingly sophisticated consumer mentality,so customers can hardly tell a particular commodity to maintain absolute blind loyalty,How to promote relationships with customers,to grasp...学位:工程硕士院系专业:软件学院_工程硕士(软件工程)学号:X201223057

    明治中期日本汉语教材中的被动句 : 与同时期中囯报刊杂志的比较

    Get PDF
    沈国威教授退休記念号departmental bulletin pape

    国内外道路声屏障的研究与发展

    Get PDF
    【中文文摘】道路声屏障是控制交通噪声、保护城市居住环境的重要设施。本文作者通过对国内外道路声屏障的研究与发展的分析,为我国道路声屏障的研究、应用与开发提供一些可资借鉴的方法。河南省科技攻关项目!98114021

    Synthesis and Characterization of Covalently Linked Porphyrin-fullerene Compounds

    Get PDF
    The covalently linked porphyrin-fullerene dyads were synthesized. The ligand 5-[4′-(4″-Phenoxybutoxy)phenyl]-N-(2-methyl)fulleropyrrolidine-10,15,20-tri-(p-methoxyphenyl)porphyrin (H2P-C60) was synthesized by 1,3 dipolar cycloaddition reaction with C60, sarcosine and H2P-CHO. The zinc porphyrin-fullerene was prepared by metalation of H2P-C60 and zinc acetate. The compounds were characterized by meams of IR, UV-Vis, ESI-MS, elemental analysis, and 1H NMR.福建省自然科学基金项目(No.E0410001);; 厦门大学自选课题基金项目(No.0040-Y07008

    MRI-T2*检测β-重型地中海贫血心、肝、胰铁沉积的临床价值

    Get PDF
    目的MRI-T2*定量评价β-重型地中海贫血(β-TM)患者心肌、肝脏、胰腺铁沉积程度,探讨心肌铁沉积与肝脏、胰腺铁沉积的关系。方法回顾性分析2014年5月至2016年1月期间在我院行心脏、肝脏、胰腺MRI-T2*检查的109例β-TM患者的临床、实验室和MRI资料,采用Spearman相关性分析探讨心肌T2*值与肝脏、胰腺T2*值之间关系。将心肌、肝脏铁沉积的患者纳入A组(n=32),仅肝脏铁沉积、而心肌铁含量正常的患者纳入B组(n=69),将心肌、胰腺铁沉积的患者纳入C组(n=34),仅胰腺铁沉积、而心肌铁含量正常的患者纳入D组(n=58),采用两独立样本比较的Wilcoxon秩和检验比较A组与B组肝脏T2*、C组与D组胰腺T2*值的差异。绘制用肝脏、胰腺R2*(1/T2*)预测心肌铁沉积的ROC曲线。结果109例β-TM患者的心肌、肝脏、胰腺T2*中位数分别为27.7(3.2~45.4)ms 、1.8(0.7~18.6)ms及6.1(1.1~42.9)ms;诊断心肌铁沉积(T2*<20 ms)34例(31.2%),肝脏铁沉积(T2*<6.3 ms)101例(92.7%),胰腺铁沉积(T2*<26 ms)92例(84.4%);诊断心肌铁沉积最小年龄7岁,肝脏和胰腺铁沉积最小年龄均为5岁。心肌T2*值与肝脏、胰腺T2*值均呈正相关(r分别为0.453、0.597, P均<0.001)。A组肝脏T2*值低于B组(Z=3.048,P=0.002),C组胰腺T2*值低于D组(Z=6.682,P<0.001)。肝脏、胰腺R2*(1/T2*)预测心肌铁沉积的ROC结果如下:曲线下面积分别为0.660(P=0.009)、0.933(P<0.001),95%置信区间分别为 (0.543~0.777) 、(0.881~0.985)。结论β-TM患者肝脏、胰腺铁沉积的发生较早、且普遍,早于心肌铁沉积。肝脏、胰腺铁沉积与心肌铁沉积相关,两者结合可用于预测心肌铁沉积的情况

    Community of benthic macrofauna on sandy intertidal zone in Chinese Horseshoe Crab Reserve in Pingtan island,China

    Get PDF
    2015年7月底,在平潭岛中国鲎(Tachypleus; tridentatus)保护区沙质潮间带进行了大型底栖动物调查。结果表明,在山岐澳和坛南湾沙质潮间带未发现鲎的幼体和成体,证实中国鲎在山岐澳和坛; 南湾已经面临濒危的境况。山岐澳潮间带的大型底栖动物物种数、物种多样性指数(H')、均匀度指数(J)和丰度指数(d)均高于坛南湾潮间带的大型底栖动; 物物种数、物种多样性指数、均匀度指数和丰度指数,而山岐澳潮间带的大型底栖动物栖息密度和生物量低于坛南湾潮间带的大型底栖动物栖息密度和生物量。两个; 海湾大型底栖动物群落的差异与肋(虫昌)螺(Umbonium; costatum)分布有关,坛南湾潮间带栖息着高密度的肋虫昌螺,而在山岐澳潮间带肋(虫昌)螺很少。AZTI's海洋生物指数(AMBI)和多变量海; 洋底栖生物指数(M-AMBI)值证实山歧澳和坛南湾沙质潮间带生态环境均属于受轻度扰动状态。山岐澳主要受海水养殖的影响,吊养的生物和浮筒减缓了水动; 力,导致山岐澳潮间带低洼区表层为泥质沉积物。坛南湾是旅游区,潮间带受人为踩踏较多。At the end of July 2015 , the benthic macrofauna were investigated in; sandy intertidal zone in Chinese Horseshoe Crab Reserve in Pingtan; island. The results showed that both the larvae and adult of Chinese; horseshoe crab were not found in sandy intertidal zone in Shanqi bay and; Tannan bay. It was confirmed that Tachypleus tridentatus stayed in an; endangered situation in the two bays. The species number, species; diversity index (H'),evenness index (J) and a-bundance index (d) of; benthic macrofauna in Shanqi bay were all higher than those in Tannan; bay,while the density and biomass of benthic macrofauna in the; intertidal zone of Shanqi bay were lower than those in Tannan bay. The; difference of benthic macrofaunal community between Shanqi bay and; Tannan bay was related to the distribution of Umbonium costatum . The; density of Umbonium costatum was high in Tannan bay,but it was few in; Shanqi bay. The values of AZTI' s Marine Biotic Index ( AMBI) and; Multivariate Marine Benthic Index (M-AMBI) showed that the ecological; and environmental status both in Shanqi bay and Tannan bay were slightly; disturbed. The mariculture was the key factor in Shanqi bay,because the; suspending aquatic organisms and floats retarded hydrodynamic force led; to muddy sediment in lower intertidal zone in Shanqi bay. Tannan bay is; a tourism region, where has more artificial tread than Shanqi bay.海洋公益项目; 国家自然科学基金面上项目; 厦门大学2015年大创资助项

    Synthesis and characterization of covalently linked porphyrin-fullerene compounds

    Get PDF
    The covalently linked porphyrin-fullerene dyads were synthesized. The ligand 5-[4-(4"-Phenoxybutoxy) phenyl]-N-(2-methyl)fulleropyrrolidine-10,15,20-tri-(p-methoxyphenyl)porphyrin (H2P-C-60) was synthesized by 1,3 dipolar cycloaddition reaction with C-60, sarcosine and H2P-CHO. The zinc porphyrin-fullerene was prepared by metalation of H2P-C-60 and zinc acetate. The compounds were characterized by meams of IR, UV-Vis, ESI-MS, elemental analysis, and H-1 NMR

    Shape-Controlled Synthesis of Surface-Clean Ultrathin Palladium Nanosheets by Simply Mixing a Dinuclear Pd-I Carbonyl Chloride Complex with H2O

    Get PDF
    通讯作者地址: Zheng, NF (通讯作者) Xiamen Univ, State Key Lab Phys Chem Solid Surfaces, Collaborat Innovat Ctr Chem Energy Mat, Xiamen 361005, Peoples R China.MOST of China 2011CB932403 ,2009CB930703 ,NSFC 21131005 ,21021061 ,20925103 ,2092300
    corecore