Fe(Ⅲ)—HAA络合显色反应的研究

Fe(Ⅲ)系络合物显色反应虽已有过很多研究〔1,2,3〕。 Fe(Ⅱ)—HAA 系显色反应的研究迄今未见有报导。本文研究了 HAA—Fe(Ⅲ)络合体系的显色反应。研究表明:络合物最佳显色酸度为 pH=3;λ_(max)为47δnm:ε=1.6×10~2l·mol^(-1)·cm^(-1)。Fe(Ⅲ)含量在0—20ug·ml^(-1)范围内遵从 Lambert-Beer 定律。络合物组成比为 Fe(Ⅲ):HAA=1:1,也存在1:5型的络合物,体系稳定,灵敏度、选择性高,五十多种常见离子试验都没有干扰。方法简便迅速,是用于微量铁测定的一个新方法。

混凝工艺去除重金属-腐殖酸有效性研究

考查了混凝剂对腐殖酸(HA)和重金属镉的络合体的去除效果。通过与混凝剂分别对腐殖酸和镉的单一去除比较发现:混凝剂对络合体的去除提高了HA和镉的去除率。通过调节不同环境因素发现:增加混凝剂用量,HA的去除率会在达到峰值后不再增加,而镉的去除率会在达到峰值后有所下降;提高p H值会加快HA的去除达到峰值且提高镉的去除率;腐殖酸溶液初始浓度越高,腐殖酸和镉的最终去除率越高;离子强度越高,HA和镉的最终去除率越低。

用DLTS和ODLTS技术研究ZnSe晶体中与Ga有关的深能级

本文应用深能级瞬态谱(DLTS)和光深能级瞬态谱(ODLTS)技术研究了掺Ga的ZnSe晶体中的深能级.发现ZnSe:Ga晶体中有一个与Ga有关的施主能级位于导带底下0.17eV处,两个与Ga有关的受主能级分别位于价带顶上0.65eV和0.72eV处.文中还对这些能级的起源进行了讨论.

Mn^(2+)协同Fe^(3+)-EDTA在中性pH条件下催化类Fenton降解水中卡马西平

研究了Mn^(2+)协同Fe^(3+)-EDTA络合体催化类Fenton反应,在中性p H条件下对水中新兴污染物卡马西平的降解情况.考察了Mn^(2+)∶Fe^(3+)、EDTA∶Fe^(3+)和H_2O_2∶Fe^(3+)的物质的量比率、Fe^(3+)浓度和初始p H等关键因素对卡马西平降解效果的影响.结果表明,共存Mn^(2+)能够显著增强Fe^(3+)-EDTA络合体催化类Fenton反应体系的氧化能力.在0.1 mmol·L^(-1)Fe^(3+)、EDTA∶Fe^(3+)为2∶1、Mn^(2+)∶Fe^(3+)为1∶1、H_2O_2∶Fe^(3+)为150∶1和p H 7.0的条件下,经过20 min反应时间,卡马西平的降解率能够达到100%,表观降解速率常数达到0.6374 min^(-1).其增效机理是通过Mn^(2+)-EDTA与H_2O_2反应促进O_2^(·-)的产生,进而加速还原Fe^(3+)-EDTA至Fe^(2+)-EDTA,间接提高HO~·的产生速率.研究结果能够为水中卡马西平的有效去除提供参考.

Effects of Substrate Complexing Light Rare Earth on Growth,Cd Absorption and Organ Distribution of Sweet Pepper(Capsicum annuum var.annuum)

[Objective] The aim was to research effects of substrate complexing light rare earth on growth, Cd absorption and organ distribution of sweet pepper to pro- vide references for development of rhizosphere regulation products in farmland seri- ously polluted. [Method] In the test, effects of substrate cakes （at the same size） and light rare earth （in different doses） on growth, Cd absorption and distribution of green peppers under stress from Cd were explored with a pot experiment. [Result] When 40 mg/kg of rare earth was added into a substrate cake, plant height of pep- per seedlings and the dry weight increased by 21.52% and 11.11%, compared with control group; when Cd was at 5.19 mg/kg （a highly graded pollution）, the shoot biomass, olant biomass and dry weight of fruits all enhanced significantly, but root system changed little in the groups where substrate cakes were saved, compared with the group where the substrate cake was washed away. No matter RE was added into substrate cakes or not, root system was significantly inhibited by Cd stress （5.19 mg/kg）, but RE at proper dose improved growth of green pepper and had little effect on fruit yielding. In addition, RE had little inhibition on Cd content in roots. RE at 10 mg/kg promoted Cd contents in stems and leaves, but reduced the content in fruits substantially. The regressive equation of Cd content and rare dose in leaves was as follows： y=4E-05x%0.009 6x＋0.655 6, FF=0.542 6; the regression equations of Cd content in root, stem and fruit did not make sense. [Conclusion] The experiment lays foundation for further research on heavy metals rhizosphere complexing controlling.

N,N—二甲基苯胺引发MMA单体均聚的研究

本文研究了N,N—二甲基苯胺在催化量情况下引发甲基丙烯酸甲酯的聚合反应,并讨论了该聚合反应的动力学等有关问题.

SOD-like Activities of SOD and Cu(Ⅱ)Complexes inLiposomes

The SOD-like activities of SOD, four Cu(Ⅱ)Complexes, SOD-and Cu(Ⅱ)com-plex-liposomes were determined respectively by using cytochrome C method. The results showed that all of these systems had SOD-like activities to some extent of which the Cu(His)_2-liposome displayed the highest activity and the Cu(Ⅱ)complexes and liposomes had some positive cooperative action.

The retromer component SNX6 interacts with dynactin p150Glued and mediates endosome-to-TGN transport

The retromer is a protein complex that mediates retrograde transport of transmembrane cargoes from endosomes to the trans-Golgi network （TGN）. It is comprised of a cargo-selection subcomplex of Vps26, Vps29 and Vps35 and a membrane-binding coat subcomplex of sorting nexins （SNXs）. Previous studies identified SNX1/2 as one of the components of the SNX subcomplex, and SNX5/6 as candidates for the second SNX. How the retromer-associated cargoes are recognized and transported by molecular motors are largely unknown. In this study, we found that one of SNX1/2＇s dimerization partners, SNX6, interacts with the p150Gued subunit of the dynein/dynactin motor complex. We present evidence that SNX6 is a component of the retromer, and that recruitment of the motor complex to the membrane-associated retromer requires the SNX6-pl50Gued interaction. Disruption of the SNX6-pl50Glued interaction causes failure in formation and detachment of the tubulovesicular sorting structures from endosomes and results in block of CI-MPR retrieval from endosomes to the TGN. These observations indicate that in addition to SNX1/2, SNX6 in association with the dynein/dynactin complex drives the formation and movement of tubular retrograde intermediates.

Time series ground subsidence inversion in mining area based on CRInSAR and PSInSAR integration

The subsidence of the mining area was monitored by analyzing the phase of permanent scatters （PS） which maintained high coherence in magnitude of SAR images.A hew method of spatial unwrapping was presented which used the subsidence rates calculated on comer reflector （CR） points as constraints for PS network to perform the spatial unwrapping using the parametric adjustment method.The algorithm achieved the integration of CR data and PSInSAR algorithm.The colliery dense distributed area around Baisha reservoir was chosen as the study area in the experiment.The time series of subsidence from February in 2007 to February in 2010 is successfully inversed by using the periodic function to simulate the linear and nonlinear components of the deformation.The simulation results show that the accuracy can be ± 2.1 mm with the leveling data being used as the external validation data.

Impact of REE La and its EDTA complexes on eutrophic water body

The different concentrations （0.10, 0.25, 0.50, 1.00 mg/L） of La^3＋ and the different concentrations （0.10, 0.25, 0.50, 1.00 mg/L） of La-EDTA were added into the simulant water body separately and the contents of DO, COD, N, P in the water body were determined regularly, The results prove that, when REE concentration is 0.25 mg/L or 0.50 mg/L, the growth of algae and eutrophication can be promoted. The promotive effect of latter is obvious. The condition that REE concentration is 0.10 mg/L or 1.00 mg/L can inhibit the growth of algae and eutrophication. Not only the promotive effect but also the inhibitive effect of La^3 ＋ is stronger than La-EDTA.

A Formula of Average Path Length for Unweighted Networks

In this paper,based on the adjacency matrix of the network and its powers,the formulas are derived for theshortest path and the average path length,and an effective algorithm is presented.Furthermore,an example is providedto demonstrate the proposed method.

Synthesis of Multi-component Mass-exchange Networks

This paper presents a superstructure-based formulation for the synthesis of mass-exchange networks (MENs) considering multiple components. The superstructure is simplified by directly using the mass separation agents (MSA) from their sources, and therefore the automatic synthesis of the multi-component system involved in the MENs can be achieved without choosing a 'key-component' either for the whole process or the mass exchangers. A mathematical model is proposed to carry out the optimization process. The concentrations, flow rates, matches and unit operation displayed in the obtained network constitute the exact representation of the mass exchange process in terms of all species in the system. An example is used to illustrate and demonstrate the application of the proposed method.

Biphasic Hydrogenation and Hydroformylation of Natural Olefins with a Binuclear Rhodium Complex in Ionic Liquid/Toluene

The complex [Rh（CO）（Pz）（TPPMS）]2, （TPPMS = m-sulfonatophenyl-diphenylphosphine, Pz = Pirazolate） was evaluated as a catalyst precursor in the hydroformylation of allylbenzenes （eugenol and estragol） and terpenes （limonene and myrcene） and in the hydrogenation of α,β-unsaturated aldehydes （crotonaldehyde, cinnamaldehyde and citral） in a biphasic medium toluene/ionic liquid. Under the reaction conditions studied （P = 600 psi, T= 95 ℃, S/C = 300：1）, the rhodium system showed a high activity and selectivity towards the desired aldehydes. The catalytic phase could be recycled up to five times without any evident loss of activity or selectivity.

Examples of Cable-Bar Modular Structures Based on the Class-Theta Tensegrity Systems

The relationship between forms and forces is one of the main topics of structural morphology. This harmonious coexisting link is very strong for systems in tensegrity state, commonly called ＂tensegrity systems＂. It is currently apparent that, among the tensegrity systems, there also exist cable-bar cells with a discontinuous network of cables. It is possible to design a separate set of cables inside the cable-bar elementary cell and to establish a self-stress state of equilibrium. In this connection, the author of this paper suggested to assume a new Class-Theta tensegrity systems. Each of the basic tensegrity systems termed Class-Theta possesses an external and internal set of tension components. The shape of Greek capital letter 69 （Theta） reflects two sets of such components （two sets of tendons, cables, etc.）. This notation corresponds to Skelton＇s Class-k tensegrity structure. As shown in this paper, the Class-Theta tensegrity cell can exemplify a geometrically and practically useful form for the lightweight and long-span modular structures, mainly but not only in view of civil engineering and architecture.

The Rise of the Far Right in Europe and the Refugee Crisis

The rise of the far right in Europe has captured the attention of the international community in recent years. Its specific features are: an unprecedentedly strong influence, an obvious trend towards the moderate line, horizontal collaboration to expand its reach, and a very adept use of social media networks. The refugee crisis has given the far right an historical opportunity. The rise has also had a profound effect on European politics; it has deepened the political divide inside EU member states, and shaken up the traditional political values and the foundation of the union.The rise of the far right will likely not change Europe's political landscape, but problems of EU governance over its handling of the refugee crisis cannot be ignored.

A Survey on Smart Collaborative Identifier Networks

The current Internet architecture was designed on the basis of a triple bindings model, which could meet the needs of the early Internet. However, with the tremendous growth of the Internet and the continuous innovations of applications, the triple bindings(namely, control/data binding, resource/location binding and user/network binding) have given rise to many problems for the Internet, such as scalability, mobility, and security. In order to solve these problems, many network techniques have been developed. Besides, novel future Internet architectures including Information-Centric Networks and Software-Defined Networks have emerged. However, these architectures only partially decouple the triple bindings. To completely separate the triple bindings, Smart Collaborative Identifier Networks(SINET) is proposed. There have been many research efforts on SINET, which built the foundation of SINET being a promising future Internet. In this paper, we comprehensively introduce SINET and these related research works. We start by introducing the motivation for SINET, explain its fundamental concepts and how it can make a difference. Next, we present in details the design principles of every layer in SINET, explaining how it can decouple the triple bindings and solve the problems of the current Internet. Finally, we discuss the state-of-theart challenges in SINET. We investigate the ongoing research works and commercial products in SINET, with aspects such as scalability, mobility, security and reliability.

The Conformity Utilization of Ceramic Culture Native Digital Resources Based On the Concept of WEB3.0

In Chinese traditional culture, ceramic culture is a very special cultural system, With the advent of the era of network and the particularity of ceramic culture, Make the network native digital resources development and utilization is especially important. The idea of Web3.0 make important ceramic culture network native digital resources ＂reasonable configuration＂, t o be more embody the value of academic research. In this paper, we＇ll discuss the conformity utilization of ceramic culture native digital resources based on the concept of WEB3.0.

The Conformity Utilization of Ceramic Culture Native Digital Resources Based On the Concept of WEB3.0

In Chinese traditional culture, ceramic culture is a very special cultural system With the advent of the era of network and the particularity of ceramic culture, Make the network native digital resources development and utilization is especially important. The idea of Web3.0 make important ceramic culture network native digital resources ＂reasonable configuration＂, t o be more embody the value of academic research. In this paper, we＇ll discuss the conformity utilization of ceramic culture native digital resources based on the concept of WEB3.0.

Charge transport in conducting polyaniline co-doped with sulfosalicylic acid and dodecylbenzoyl sulfonic acid

We prepared conducting polyaniline （PAn） co-doped with sulfosalicylic acid （SSA） and dodecylbenzoyl sultonic acid （DBSA） in micro-emulsive polymerization, and studied its charge transport behaviors based on the measurement of its electrical conductivity in the temperature range between 203 K and 298 K. The conductivity was found to increase with temperature, similar to the case in semiconductors. Analyzing the experimental data with three models, namely the charge-energy-limitedtunneling model, Kivelson model and the three-dimensional variable range hopping （3D-VRH） model demonstrated that these models all describe well the charge transport behaviors of PAn co-doped with SSA and DBSA within the mentioned temperature range. From calculation with the 3D-VRH model, the hopping distance of the conducting PAn is obviously larger than its localization length. The PAn doped with SSA and DBSA enjoys desirable crystallinity due to the co-doping of two functional sulfonic acids. The macroscopic conductivity may correspond to three-dimensional transport in the network of the bundles, and the metallic islands may be attributed to quasi-one-dimensional bundles.

A near-infrared phosphorescent probe for F^- based on a cationic iridium(Ⅲ) complex with triarylboron moieties

In this work, a near-infrared (NIR) phosphorescent probe for F- based on a cationic Ir(III) complex [Ir(Bpq)2(quqo)]PF6 (1) with dimesitylboryl (Mes2B) groups on the cyclometalated CAN ligands (Bpq) and 2-(quinolin-2-yl)quinoxaline (quqo) as NAN ligand was designed and synthesized. The excited state properties of 1 were investigated in detail using molecular orbital calculations and experimental methods. Upon excitation, complex 1 shows NIR phosphorescent emission around 680 nm. Interestingly, the complex can be excited with long wavelength around 610 nm. Such long-wavelength excitation can reduce the background emission interference and improve the signal-to-noise ratio. Furthermore, the selective binding between boron atom and F- can give rise to the quenching of emission and realize the near-infrared phosphorescent sensing for F-. We wish that the results reported herein will be helpful for the further design of excellent near-infrared phosphorescent probes based on heavy-metal complexes.