48 research outputs found

    Measuring the Value of Blue Carbon in China Coastal Zone

    Get PDF
    自工业化以来,大气二氧化碳及其他温室气体的浓度已增加了40%,不断增 加的温室气体排放是全球气候变化的重要原因,从而对全球粮食生产以及人类的 生活和生计造成严重影响,气候变化是人类21世纪面临的重大挑战之一。研究 显示全球自然系统封存的生物碳中,超过一半是由海洋生态系统所捕获,被海洋 生态系统捕获并封存的碳称为蓝碳。维持和促进海洋生态系统封存二氧化碳的能 力是应对气候变化的关键措施之一,但是海洋生态系统在应对气候变化中的作用 被长期忽略,其中重要的原因之一是没有赋予蓝碳适宜的价值。本文在对蓝碳理 论系统梳理的基础上,借鉴国内外滨海植物生境、河口、浮游植物、养殖贝类的 碳封存能力...IPCC has pointed that the concentration of atmospheric carbon dioxide has increased by 40 percent since industrialization. Increasing emissions of greenhouse gas are an important cause of global climate change and have a serious impact on global food production and and livelihoods.Climate change is one of the major challenges of the 21st century. The study shows that blue carbon which is captured ...学位:理学硕士院系专业:环境与生态学院_环境管理学号:3332013115175

    宗教信仰与政治态度:管窥10年间台湾政教关系的变迁(2004-2014)——基于两期TSCS数据的实证分析

    Get PDF
    长期以来,宗教在台湾社会中扮演着十分重要的角色,通过政教关系把握岛内政治具有特殊的意义。本文基于TSCS2004与TSCS2014的数据,初步考察了10年间台湾民众的宗教信仰与国族认同、政党偏好、政治兴趣、抗争意识这四项政治态度之间的关系演变。经研究发现:首先,倾向于认同自己是中国人的群体由先前的无宗教信仰者变成了佛教徒,同时信仰民间宗教的人还开始表现出明显的台湾人认同偏好;其次,虽然佛教徒与天主/基督教徒倾向于支持蓝营而民间信仰者则与此相反,但各信仰间的相关差异在缩小且有向中间路线靠拢的趋势;再者,只有天主/基督教徒长期抱有比较强烈的政治关怀,其他群体则基本对政治没有多少兴趣,但是如果与无宗教信仰者相比,天主/基督教徒的这种倾向在2014年时已不再明显;最后,信仰天主/基督教的群体倾向于积极参加政治抗争,而信仰佛教、道教以及民间宗教的群体却对此态度消极,而且与10年前相比,无宗教信仰的台湾民众要明显更偏好参加集体行动。这些发现为今后进一步研究台湾的政教关系提供了若干思路与方向。教育部人文社会科学重点研究基地重大项目“建构‘两岸命运共同体’的理论与实践研究(16JJDGAT003)”研究成

    一种自供电多传感器无线环境质量监测系统的设计

    Get PDF
    为了实时精确监测既定区域的环境质量状况,解决传统无线传感网因电池不耐用又不能及时更新而导致网络中断的问题,研究设计了一种自供电多传感器的无线环境质量监测系统。所研究设计的无线传感网节点利用太阳能光伏电池板发电完成自供电,并对最大功率点跟踪控制算法进行了优化改进,解决了因电池不能及时充电而导致的传感器节点工作异常的问题,实现了环境质量状况无人值守实时监测。利用数据融合算法,将多节点传感器采集到的数据进行数据融合,通过实验测试表明,所设计系统的测试数据和当地当天中国环境监测总站发布的环境质量状况数据基本吻合。复杂系统优化与大数据处理广西高校重点实验室科研课题资助(No.2017CSOBDP0103);;广西高校科学与技术研究项目(201012MS185);;贵州省科学与技术基金(LKS[2012]34

    Theoretical Study on Intramolecular Proton Transfer Reaction in 2-(2-Mercaptophenyl)benzoxazole

    Get PDF
    在b3lyP/6-31g(d,P)水平上研究了2-(2-巯苯基)苯并噁唑气态中五种异构体(E1,E2,E3,E4和k)在气态中的稳定性及其在基态下的质子转移,同时结合极化连续介质模型(PCM)研究了水、二甲亚砜、乙腈、乙醇、苯胺和环己烷等对2-(2-巯苯基)苯并噁唑溶剂化作用的影响.研究结果表明,醇式异构体E1为2-(2-巯苯基)苯并噁唑的优势构型;在E1向k(酮式异构体)转变过程中,存在一个较小的能垒;当考虑零点振动能(zPVE)后,逆向能垒消失.在溶液中,随着溶剂极性的增强,醇式异构体E1与k之间的反应平衡向k方向移动,在非极性溶剂环己烷中,E1为优势构型,而在强极性水溶液中,k为优势构型。The tautomers(E1,E2,E3,E4,and K) and the ground state intramolecular proton transfer reaction of 2-(2-mercaptophenyl)benzoxazole were studied at the B3LYP/6-31G(d,p) level.The effect of solvent(water,dimethylsulfoxide,acetonitrile,ethanol,aniline,and cyclohexane) was studied at the B3LYP/6-31G(d,p) level,using the polarizable continuum model.The results of density functional calculations indicate that the enol form E1 is the most stable tautomer at the ground state.In these solvents there is an equilibrium for 2-(2-mercaptophenyl)benzoxazole in the ground state between E1 and K,and the equilibrium shifts toward the tautomer K as the polarity of the solvent increases.E1 is the preferential conformation in cyclohexane,but K is the more stable tautomer in water.国家自然科学基金(Nos.20772027;20803020);973子课题(No.2003CB716005);中国博士后科学基金(No.20070410805)资助项

    NMR and Theoretical Study on Interactions between Diperoxovanadate Complex and Substituted Pyridines

    Get PDF
    为探讨有机配体上取代基团对反应平衡的影响,在模拟生理条件下(0.15mol/L NaCl溶液),应用多核(1H,13C和51V)多维(DOSY)以及变温NMR技术研究双过氧钒配合物[OV(O2)2(D2O)]-/[OV(O2)2(HOD)]-(简写为bpV)与取代吡啶的相互作用.bpV与有机配体的反应性从强到弱的顺序为:皮考林酸根>异烟酸根>异烟酸甲酯>皮考林甲酯,这说明吡啶环上同一位置上的不同取代基团和同一取代基团在不同位置上都影响反应平衡,竞争配位导致一系列新的6配位(配体为异烟酸根和异烟酸甲酯)或7配位(配体为皮考林酸根和皮考林甲酯)的过氧钒物种[OV(O2)2L]n-(L=取代吡啶,n=1或2)生成,密度泛函计算结果较合理地解释了实验结果,并表明溶剂化在反应中起重要作用.To understand the substitution group effects of organic ligands on the reaction equilibrium,the interactions between diperoxovanadate complex [OV(O2)2(D2O)]-/[OV(O2)2(HOD)]-(abbr. bpV) and a series of substituted pyridines were explored using multinuclear(1H,13C,and 51V) magnetic resonance,DOSY,and variable temperature NMR in 0.15 mol/L NaCl ionic medium for mimicking the physiological condition. The reactivity order among the substituted pyridines and bpV is picolinate>isonicotinate> methyl isonicotinate>methyl picolinate. The competitive coordination results in the formation of a series of new six-coordinated(isonicotinate and methyl isonicotinate) or seven-coordinated(picolinate and methyl picolinate) peroxovanadate species [OV(O2)2L]n-(L=substituted pyridines,n=1 or 2). Both the different substitution groups at the same position and the same groups at the different substitution position affect these reactions. The results of density functional calculations provide someway a reasonable explanation for the relative reactivity of the substituted pyridines. Solvation effects play an important role in these reactions.国家自然科学基金(Nos.20772027,20803020);; 973子课题(No.2003CB716005);; 湖南省自然科学基金(No.06JJ30004);; 中国博士后科学基金(No.20070410805);; 湖南省教育厅青年项目(No.06B028);; 固体表面物理化学国家重点实验室资助项目;; 湖南科技大学博士基金(No.E-55107)资助项目

    NMR Studies on Interactions between Diperoxovanadate and 1-Ethyl-1H-Imidazole

    Get PDF
    为探讨过氧钒配合物中有机配体对反应平衡的影响,在模拟生理条件下(0.15MOl·l-1nACl溶液),应用多核(1H、13C和51V)多维(COSy和HSQC)核磁共振(nMr)以及变温技术等谱学方法研究双过氧钒配合物[OV(O2)2l]-(l=d2O或HOd,与之配位的过氧钒物种简写为bPV)和[OV(O2)2ll′]n{-n=1-2,ll′=3-羟基-皮考啉酸根(3-OH-PIC),2-(2′-吡啶)-咪唑(Py-IM),1,10-邻菲啰啉(PHEn),与它们配位的含钒物种分别简写为bPV(3-OH-PIC)、bPV(Py-IM)和bPV(PHEn)}与n-乙基咪唑(n-ET-IM)的相互作用.实验结果表明,n-ET-IM与4种双过氧钒配合物反应性从强到弱的顺序为bPV>bPV(3-OH-PIC)>bPV(Py-IM)>bPV(PHEn).研究表明,金属中心上配体的配位能力、空间位阻和分子量等因素都对反应平衡产生较大的影响,同时竞争配位的结果导致新的6配位过氧物种[OV(O2)2(n-ET-IM)]-的生成.利用上述谱学方法有助于揭示此类相互作用体系的反应过程和配位方式.To understand the effects of organic ligands on the reaction equilibrium, interactions between a series of diperoxovanadate complexes [OV(O2)2L]- (L=D2O or HOD, the corresponding peroxovanadate species (bpV)) and [OV (O2)2LL′]n-{n=1-2; LL′ =3-hydroxyl-picolinate (3-OH-pic), 2-(2′-pyridine)-imidazole (py-im), 1,10-phenanthroline (phen), the corresponding peroxovanadate species bpV(3-OH-pic), bpV(py-im), and bpV(phen)}and 1-ethyl-1H-imidazole (N- Et-im) in solution were explored using multinuclear (1H, 13C, and 51V) magnetic resonance, COSY (correlated spectroscopy), HSQC (heteronuclear single quantum coherence) and variable temperature nuclear magnetic responance (NMR) using 0.15 mol·L-1 NaCl ionic medium to mimic physiological conditions.Experimental results indicated that the reactivity of these four complexes with 1-ethyl-1H-imidazole decreased as follows: bpV>bpV(3-OH-pic)>bpV(py-im)> bpV(phen).The coordinating ability, the steric effect, and the molecular weight of these organic ligands affected the reaction equilibrium.A new six-coordinated peroxovanadate species [OV(O2)2(N-Et-im)]- was formed because of competitive coordination.国家自然科学基金(20772027;20803020);中国博士后科学基金(20070410805);卫生部科学研究基金-福建省卫生教育联合攻关计划(WKJ2008-2-036);厦门市重大疾病攻关研究基金(3502Z20051027)资助项目---

    NMR studies on interactions between diperoxovanadate complexes and 1-methylimidazole

    Get PDF
    To understand the effects of organic ligands of the diperoxovanadate complexes on the reaction equilibrium, the interactions between a series of diperoxovanadate complexes [OV(O-2)(2)LL '](n-) [n=1 similar to 3; LL '=oxalate, abbr. oxa; picolinate, abbr. pic; 2,2 '-bipyridine, abbr. bipy; and 1,10-phenanthroline, abbr. phen. The corresponding peroxovanadate species abbreviate bpV(oxa), bpV(pic), bpV(bipy), and bpV(phen)] and I-methylimidazole (abbr. N-Me-Im) in solution were explored using multinuclear (H-1, C-13, and V-51) magnetic resonance, COSY, and variable temperature NMR in 0.15 mol/L NaCl ionic medium for mimicking the physiological conditions. The experimental results indicated the activity order of these four complexes with I-methylimidazole as follows: bpV(oxa)> bpV(pic)> bpV(bipy)> bpV(phen). Both the coordinating capability and the steric effect of the organic ligands affect the reaction equilibrium. At the same time, a new six-coordinated peroxovanadate species [OV(O-2)(2)(N-Me-Im)](-) is formed due to the competitive coordination

    NMR Studies on Interactions between Diperoxovanadate and 1-Ethyl-1H-Imidazole

    Get PDF
    To understand the effects of organic ligands on the reaction equilibrium, interactions between a series of diperoxovanadate complexes [OV(O-2)(2)L](-) (L=D2O or HOD, the corresponding peroxovanadate species (bpV)) and [OV (O-2)(2)LL'](n-) {n=1-2; LL' =3-hydroxyl-picolinate (3-OH-pic), 2-(2'-pyridine)-imidazole (py-im), 1,10-phenanthroline (phen), the corresponding peroxovanadate species bpV(3-OH-pic), bpV(py-im), and bpV(phen)} and 1-ethyl-1H-imidazole (N-Et-im) in solution were explored using multinuclear (H-1, C-13, and V-51) magnetic resonance, COSY (con-elated spectroscopy), HSQC (heteronuclear single quantum coherence) and variable temperature nuclear magnetic responance (NMR) using 0.15 mol.L-1 NaCl ionic medium to mimic physiological conditions. Experimental results indicated that the reactivity of these four complexes with 1-ethyl-1H-imidazole decreased as follows: bpV > bpV(3-OH-pic)> bpV(py-im)> bpV(phen). The coordinating ability, the steric effect, and the molecular weight of these organic ligands affected the reaction equilibrium. A new six-coordinated peroxovanadate species [OV(O-2)(2)(N-Et-im)](-) was formed because of competitive coordination.National Natural Science Foundation of China [20772027, 20803020]; China Postdoctoral Science Foundation [20070410805]; Science Research Foundation of Ministry of Health & United Fujian Provincial Health ; Education Project for Tackling the Key Research [WKJ2008-2-036]; Health and Science and Technology of Xiamen, China [3502Z20051027
    corecore