二维拉曼相关光谱研究稀土离子Eu~(3+)对血红蛋白结构的影响

用二维拉曼相关光谱技术研究了稀土离子 Eu3+ 对血红蛋白结构的影响 .结果表明 ,以 Eu3+ 浓度作为微扰 ,血红蛋白的结构敏感谱带均对微扰敏感 ,氧化态和自旋态标志谱带 1 3 74和 1 640 cm- 1发生了同步变化 ,且明显先于其它谱带强度的变化 ,稀土离子 Eu3+ 对血红蛋白的作用主要是影响它的氧化态和自旋态.

Valence of elements in HgBa2Can-1CunO2n+2+delta (n=1, 2, 3, 4)

Valence of elements in HgBa2Can-1CunO2n+2+delta (n=1, 2, 3, 4) (both argon and oxygen annealed samples) were calculated. The result indicated for both argon and oxygen annealed samples, Hg had the lowest valence for the highest T-c sample. For fixed n, the valence of Cu in oxygen annealed samples was larger than that in argon annealed samples, indicating that oxygen annealed samples produce more carriers than argon annealed samples.

稀土与L-组氨酸L-谷氨酸三元配合物的pH电位法研究

报道了在模拟生理条件 ( 37℃ ,c =0 .15mol· L-1Na Cl)下用精密 p H电位法对 15种稀土元素与 L-组氨酸及 L-谷氨酸溶液体系三元配合物稳定常数的测定结果 ,实验数据处理用程序Miniquad- 82 A完成 ,玻璃电极的选择及校正用 Magec程序完成 .结果表明在该三元体系中普遍存在 3种类型的酸式配合物 ( 1111,1112及 1113型 ) ,且每一类型配合物的稳定常数相差较小.

EQCM characterization of self-assembled kinetics of 4-pyridyl hydroquinone at Pt surface and its ion transfer in electrochemical redox

The adsorbed kinetics, proton transportation in electrochemical redox process of 4-pyridyl hydroquinone (4PHQ) self-assembled monolayer (SAM) modified Pt electrode were studied by electrochemical quartz crystal microbalance (EQCM) in situ. It proved that the electrode was modified by a monolayer and underwent a rapid electron transfer. It was a slow adsorbed kinetic process. The ion transfer in the electrochemical redox at the SAM-modified electrode surface mainly involved into the hydrate hydrogen ion.

pH-potentiometric study on rare earths and calcium binary and ternary complexes with DL-malic acid and L-hydroxyproline

The stability constants of M-L binary system and M-L-L' (M = La3+ similar to Yb3+, Y3+ and Ca2+; L= DL-malic aicd, L' = L-hydroxyproline) ternary system were determined by pH-(0)-tentiometric method under the simulating physiological condition(37 degrees C, I=0.15 mol/L NaCl). The complex species MpLqLr'H-s(abbr as pqrs) in the sytems were ascertained by program COMPLEX. The results show that there are three species(1101, 1100 and 1200) in M-L binary system and one species(1010) in M-L' binary system. In addition to the above four species, a new species, 1112 was found in the M-L-L' ternary system, which is the only species of mixed ligands. Rare earth ions form more stable complexes than calcium ion does and the stability differences between their complexes in the ternary system are less than that in the binary system. The distributions of all the species in La-L-L' ternary system vs pH are discussed.

乙醇存在下偶氮胂Ⅲ分光光度法高选择性测定锆(铪)

在含乙醇40％的4.3mol/L盐酸体系中,偶氮胂Ⅲ与锆(铪)形成灵敏的高次配合物(1∶3)。在665nm处测得摩尔吸光系数εZr=1.49×10~5,εHf=1.53×10~5,相当于水溶液灵敏度的2—3倍。本方法具有很好的选择性,可用于直接测定合金中微量锆(铪)。方法简便、快速、可靠。

Factors influencing the climatological mixed layer depth in the South China Sea: numerical simulations

The mixed layer depth (MLD) in the upper ocean is an important physical parameter for describing the upper ocean mixed layer. We analyzed several major factors influencing the climatological mixed layer depth (CMLD), and established a numerical simulation in the South China Sea (SCS) using the Regional Ocean Model System (ROMS) with a high-resolution (1/12A degrees x1/12A degrees) grid nesting method and 50 vertical layers. Several ideal numerical experiments were tested by modifying the existing sea surface boundary conditions. Especially, we analyzed the sensitivity of the results simulated for the CMLD with factors of sea surface wind stress (SSWS), sea surface net heat flux (SSNHF), and the difference between evaporation and precipitation (DEP). The result shows that of the three factors that change the depth of the CMLD, SSWS is in the first place, when ignoring the impact of SSWS, CMLD will change by 26% on average, and its effect is always to deepen the CMLD; the next comes SSNHF (13%) for deepening the CMLD in October to January and shallowing the CMLD in February to September; and the DEP comes in the third (only 2%). Moreover, we analyzed the temporal and spatial characteristics of CMLD and compared the simulation result with the ARGO observational data. The results indicate that ROMS is applicable for studying CMLD in the SCS area.

东太平洋海隆13°N附近含金属沉积物中的有机碳氮研究

本文根据热液活动对海底沉积环境影响的程度，将海底沉积环境划分为三个部分：热液直接作用区（硫化物分布区），热液间接作用区（含金属沉积物区），正常沉积区。东太平洋海隆13°N附近所取得的三个沉积物柱状样(E271、E272、E53)属于含金属沉积物区，以它们为研究对象（E271和E272是重点研究对象），进行了粒度、粘土矿物、有机碳氮和无机碳分析，并结合已有的测年数据和金属元素含量数据，对含金属沉积物中的有机碳氮进行了系统的讨论。 沉积物无机组分的物源分析表明，沉积物中富含铁锰的组分主要是非晶质或结晶程度较差的铁锰氧化物和氢氧化物。来自于火山灰蚀变的富铁蒙脱石也有一定的贡献，但是含量太少。铁锰氧化物或氧氧化物倾向于集中在细粒的物质中。铁锰含量自下而上的递增趋势反映了热液活动程度增强的趋势。 三个站位沉积物中有机碳的含量都很高，E271、E272 有机碳含量在0.9%-1.5%之间，而E53含量则相对更高，最高可达4.6%。E271、E272自下而上有递增的趋势，它与铁锰的含量有一定的相关性，可能有机质与铁锰之间存在某种联系。有机碳的沉积通量很低，E271上层为4.06mg/ka•cm2 ，下层仅为0.84mg/ ka•cm2。因此沉积物中高有机碳含量显示的高生产力是一种假像，并不能代表古海水表层生产力很高。 C/N值在三个站位的变化情况各有不同。按照常规的把有机质来源分为海洋表层生物与陆源有机碳来源，那么E271和E53站位总体上水生有机碳在总有机碳中居主要成分。E272上层是海洋生物来源占优，下层是陆源生物占优。但是根据热液plume存在细菌和TEP的特性，应该考虑沉积物中有机质是表层生物源和热液影响的生物源。经过假设计算，认为热液影响的生物有机碳源受到热液柱扩散形态的影响，且与热液活动的稳定性有关。因此两相比较，认为该研究区，有机质来源应该选择表生有机碳与受热液影响生物有机碳为两个端元组分。受热液生物影响的程度为E272>E271>E53。 在E272站位沉积物中发现的一些细菌种类与热液喷口区的嗜热细菌相似程度很高，它们可能是随着Plume飘移而迁移，并沉降到沉积物中。它们的存在对有机碳的含量和组成将会产生影响。这是一个热液生物影响沉积物有机碳的直观的证据。 通过Fe、Mn、Al 含量随深度变化的趋势，推断出碳酸钙自下而上减小不是因为热液组份的加入对其含量稀释而成的，应该是沉积环境的改变，导致其溶解度增加所致。 在研究过程中，还对沉积物中有机碳的测定方法进行了探讨，鉴于不同方法之间带来的有机碳数据上的误差，建议建立一种标准的测试方法，便于有机碳数据的比较。计算沉积速率和沉积通量时，对E271用含水量进行了去压实校正。根据计算，当含水量变化很大时，去压实作用是有必要的。

叠前地震数据规则化、重建及噪音压制

I address of reconstruction of spatial irregular sampling seismic data to regular grids. Spatial irregular sampling data impairs results of prestack migration, multiple attenuations, spectra estimation. Prestack 5-D volumes are often divided into sub-sections for further processing. Shot gathers are easy to obtain from irregular sampling volumes. My strategy for reconstruction is as follows: I resort irregular sampling gathers into a form of easy to bin and perform bin regularization, then utilize F-K inversion to reconstruct seismic data. In consideration of poor ability of F-K regularization to fill in large gaps, I sort regular sampling gathers to CMP and proposed high-resolution parabolic Radon transform to interpolate data and extrapolate offsets. To strong interfering noise--multiples, I use hybrid-domain high-resolution parabolic Radon transform to attenuate it. F-K regularization demand ultimately for lower computing costs. I proposed several methods to further improve efficiency of F-K inversion: first I introduce 1D and 2D NFFT algorithm for a rapid calculation of DFT operators; then develop fast 1D and 2D CG method to solve least-square equations, and utilize preconditioner to accelerate convergence of CG iterations; what’s more, I use Delaunay triangulation for weight calculation and use bandlimit frequency and varying bandwidth technique for competitive computation. Numerical 2D and 3D examples are offered to verify reasonable results and more efficiency. F-K regularization has poor ability to fill in large gaps, so I rearrange data as CMP gathers and develop hybrid-domain high-resolution parabolic Radon transforms which be used ether to interpolate null traces and extrapolate near and far offsets or suppress a strong interfere noise: multiples. I use it to attenuate multiples to verify performances of our algorithm and proposed routines for industrial application. Numerical examples and field data examples show a nice performance of our method.

On Interpreting Stereo Disparity

The problems under consideration center around the interpretation of binocular stereo disparity. In particular, the goal is to establish a set of mappings from stereo disparity to corresponding three-dimensional scene geometry. An analysis has been developed that shows how disparity information can be interpreted in terms of three-dimensional scene properties, such as surface depth, discontinuities, and orientation. These theoretical developments have been embodied in a set of computer algorithms for the recovery of scene geometry from input stereo disparity. The results of applying these algorithms to several disparity maps are presented. Comparisons are made to the interpretation of stereo disparity by biological systems.

Boundary triplets and M-functions for non-selfadjoint operators, with applications to elliptic PDEs and block operator matrices

B.M. Brown, M. Marletta, S. Naboko, I. Wood: Boundary triplets and M-functions for non-selfadjoint operators, with applications to elliptic PDEs and block operator matrices, J. London Math. Soc., June 2008; 77: 700-718. The full text of this article will be made available in this repository in June 2009 Sponsorship: EPSRC,INTAS

Non-tactical symmetric nets

Mavron, Vassili; Al-Kenani, A.N., (2003) 'Non-tactical symmetric nets', Journal of the London Mathematical Society 67(2) pp.273-288 RAE2008

Letter to Charlie Brown from Daniel Denison Whedon

This letter is part of the Autograph Letters Collection.

Hardware design of cryptographic accelerators

With the rapid growth of the Internet and digital communications, the volume of sensitive electronic transactions being transferred and stored over and on insecure media has increased dramatically in recent years. The growing demand for cryptographic systems to secure this data, across a multitude of platforms, ranging from large servers to small mobile devices and smart cards, has necessitated research into low cost, flexible and secure solutions. As constraints on architectures such as area, speed and power become key factors in choosing a cryptosystem, methods for speeding up the development and evaluation process are necessary. This thesis investigates flexible hardware architectures for the main components of a cryptographic system. Dedicated hardware accelerators can provide significant performance improvements when compared to implementations on general purpose processors. Each of the designs proposed are analysed in terms of speed, area, power, energy and efficiency. Field Programmable Gate Arrays (FPGAs) are chosen as the development platform due to their fast development time and reconfigurable nature. Firstly, a reconfigurable architecture for performing elliptic curve point scalar multiplication on an FPGA is presented. Elliptic curve cryptography is one such method to secure data, offering similar security levels to traditional systems, such as RSA, but with smaller key sizes, translating into lower memory and bandwidth requirements. The architecture is implemented using different underlying algorithms and coordinates for dedicated Double-and-Add algorithms, twisted Edwards algorithms and SPA secure algorithms, and its power consumption and energy on an FPGA measured. Hardware implementation results for these new algorithms are compared against their software counterparts and the best choices for minimum area-time and area-energy circuits are then identified and examined for larger key and field sizes. Secondly, implementation methods for another component of a cryptographic system, namely hash functions, developed in the recently concluded SHA-3 hash competition are presented. Various designs from the three rounds of the NIST run competition are implemented on FPGA along with an interface to allow fair comparison of the different hash functions when operating in a standardised and constrained environment. Different methods of implementation for the designs and their subsequent performance is examined in terms of throughput, area and energy costs using various constraint metrics. Comparing many different implementation methods and algorithms is nontrivial. Another aim of this thesis is the development of generic interfaces used both to reduce implementation and test time and also to enable fair baseline comparisons of different algorithms when operating in a standardised and constrained environment. Finally, a hardware-software co-design cryptographic architecture is presented. This architecture is capable of supporting multiple types of cryptographic algorithms and is described through an application for performing public key cryptography, namely the Elliptic Curve Digital Signature Algorithm (ECDSA). This architecture makes use of the elliptic curve architecture and the hash functions described previously. These components, along with a random number generator, provide hardware acceleration for a Microblaze based cryptographic system. The trade-off in terms of performance for flexibility is discussed using dedicated software, and hardware-software co-design implementations of the elliptic curve point scalar multiplication block. Results are then presented in terms of the overall cryptographic system.