Spectral Complex for Controlling the Parameters of the Plasmachemical‐Reactor Working Medium

An automated spectral complex for controlling the parameters of the plasmachemicalreactor working medium by the emission and absorption spectra in the 200–1100 and 2000–5000nm ranges has been developed. To record radiation, a CCD array and a pyroelectric detector are used. Control of the spectral device functions, data recording, and the obtaining of results reflecting the workingmedium parameters and the concentration in it of components being measured are carried out by means of a personal computer. The complex makes it possible to study the temporal behavior of the workingmedium parameters being measured with a resolution of up to 10^–2 sec.     

Investigation of Kinematics of the Portevin-Le Chatelier Deformation Bands with Dynamic Digital Speckle Pattern Interferometry

The Portevin-Le Chatelier (PLC) effect with typical temporal instabilities in the recorded stress is closely associated with local inhomogeneities of deformation. By employing the dynamic digital speckle pattern interferometry technology, the characterizations for the PLC deformation bands of type A (continuous propagation along the specimen), type B (“hopping“ propagation along the specimen) and type C (random nucleation in the sample) were distinctly clarified. The corresponding positions of deformation bands were traced throughout the whole tensile process. By systemic experiments, the range of the applied strain rates for each type of bands existing was investigated respectively. The evolution of the band velocity (for types A and B) was also statistically investigated and qualitatively interpreted.     

Speckle interferometry for the strain field of geologic structure model

Based on imitative experiment of structure mechanics,four-aperture defocusedspeckle shearing interferometry is used to obtain the distribution of strain field of the geologicstructure model of the Jiulong mountain in Sichuan Basin.And through the analysis of the ex-perimental data,we can give some experdriental basis for recognizing the distribution of thegeologic fracture in the district of the Jiulong Mountain. Exploration practice shows that fracture distribution predicted by theory agrees with actu-al situation.     

Possibility of Using the Effect of Radio‐Optical Resonance for Spectral Analysis of Radio Signals

The absorption spectrum of optically oriented Cs atoms which is induced by a train of radiofrequency pulses is compared to the spectral components of the radio field. Possibilities of using the results obtained in the development of widerange microwave spectrum analyzers of high resolution are indicated.     

Evaluation of Coulomb Energy Difference for Light Mirror Nuclei Using Slater—Type Orbitals

Behavior of the Coulomb energy difference for light nuclei is explained in terms of the different values of the average Coulomb interaction between two particles.Coulomb energy difference according to shell model of light mirror nuclei in the Coulomb and exchange integrals in the formula can be explained with exponential-type wavefunctions.In this study,using the one-center expansion of exponential-type wavefunctions in terms of Slater-type orbitals with the same center,we derived formula for Coulomb energy difference of light mirror nuclei.     

Insensitivity of Speckle Multiplexing to Multi—longitudinal Modes of Laser in Volume Holographic Storage

If a diode pumped solid state laser is used in a holographic storage system,its multi longitudinal modes may damage the angular selectivity of the hologram amd introduce more cross talk in the system.By theoretical analysis,we found that with adopting the speckle multiplexing scheme,holographic systems are no longer sensitive to the multi longitudinal modes of the laser source,and consequently the damage described above could be well suppressed.Moreover,the following high density storage experimental results also express strong advocacy of this conclusion.this result may greatly prompt the miniaturization of holographic stroage system.     

Investigation of the First Mirror on Tokamak

The study progress of NNSF in 2006 has been presented in this paper. The aim and plan of this item have been described briefly. Three test mirror exposure experiments have been done in this year. The main components of the deposited materials on the first mirror are carbon and iron analyzed by AES. The first mirror is polluted easier during glow discharge and wall processing than omhic discharge.     

Using the shaping filter for removing the effcets of the bubble pulses of explosive charge

Using the shaping filter to remove the effects of the bubble pulses ofexplosive charge,we obtained the impulse response function of the sea bot-tom.The result is quite satisfactory.     

Exact Solution of the Cluster Size Distribution for Multi—polymer Coagulation Process

We propose a simple irreversible multi-polymer coagulation model in which m polymers consist of multiple components bond spontaneously to form a larger cluster.We solve the generalized Smoluchowski rate equation with constant reaction rates to obtain the exact solution of the cluster size distribution.The results indicate that the evolution behaviour of the system depends crucially on the polymer number m of the coagulation reaction.The cluster concentrations decay as t^-m/(m-1)^2,and the typical sizeS(t) of the m-polymer coagulation system grows as t^1/(m-1).On the other hand,the cluster size distribution may approach unusual scaling form in some cases.     

On the Calculation of the Special Geometry for a Calabi—Yau Loop Manifold and Two Constructions of the Mirror Manifold

JETP Letters - The Kähler potentials have been calculated on the moduli space of complex structures for two Calabi-Yau manifolds specified as hypersurfaces in weighted projective spaces....     

A Multi Purpose DAQ System Developed for the nTOF Commissioning

The neutron Time Of Flight (nTOF) facility at CERN is a high flux spallation neutron source commissioned in Nov 2000 and APr 2001.For the commissioning phases an innovative multipurpose DAQ system was developed and used.This system is capable of handling high data rated(10Mb/s) with the use of the National Instruments PCI-VXI interface board to communicate with the VME crates.The graphical user interface is based on Java^TM and ROOT allowing immediate visualization of the data and providing a flexible way of creating configurations for various experimental setups.     

A New Filter Technique for Image of Electronic Speckle Pattern Interferometric Fringe

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Measurement of Random Surface Parameters of Weak Scatterers using the Speckle Contrast Method

Theoretical analysis shows that the deviation roughness ωand the lateral correlation length ξ of a weak scattering object determine the different properties of the contrast of the speckles in the image plane of a 4f system.Experimentally,we have measured the data of the speckle contrast versus the radius R of the variable filtering aperture.By fitting the theoretical results to these data,we extract the parameters ω and ξ of the random surfaces with Gaussian correlation.This method can determine the two parameters simultaneously and independently,and pre-calibrations are not needed.     

Procedures of Separation and Pre‐concentration for Molybdenum Determination Using Atomic Spectrometry—a Review

Abstract

The literature concerning the improvement of atomic and ionic procedures for molybdenum determination through separation and pre‐concentration were updated. Analytical procedures based on flame atomic absorption spectrometry (AAAS), electrothermal or graphite furnace atomic absorption spectrometry (GFAAS), inductively coupled plasma optical emission spectrometry (ICP‐OES), and inductively coupled plasma mass spectrometry were reviewed taking into consideration the preliminary steps, which can enhance the selectivity and sensitivity based on co‐precipitation, solvent extraction, and solid‐phase extraction. Both in‐batch and on‐line procedures were considered.     

A Spectrofluorimetric Sequential Injection Method for the Determination of Penicillamine Using Fluorescamine in the Presence of β-cyclodextrins

A simple, robust and sensitive sequential injection spectrofluorimetric method for the determination of penicillamine (PA) in pharmaceutical formulations is developed. The method is based on the formation of a highly fluorescent derivative when penicillamine is reacted with fluorescamine (FL) in borate buffer of pH 9.3. The derivative produced is monitored at an emission wavelength of 495 nm using an excitation wavelength of 355 nm. The optimum conditions for the determination of PA with FL were: 3 mM FL, pH 9.3, 5 mM methyl-β-cyclodextrin, sample volume of 75 μL and reagent volume of 75 μL. Furthermore, the effect of various media on the fluorescence intensity of the PA–FL derivative was studied and methyl-β-cyclodextrin was found to give the largest enhancement. A linear dynamic range for the determination of PA of 5–80 ppm was obtained with a sampling frequency of 50 h⁻¹ and a relative standard deviation of less than 2.5%. The method was applied to the determination of PA in pharmaceutical formulations with reasonable recoveries ranging from 101.0–103.1%, indicating that no interference is observed from concomitants usually present in dosage forms.     

Speckle Reduction of Kinoform Reconstruction Utilizing the 2π Ambiguity of Image Phase Differences

An iterative speckle reduction method is proposed to reduce the speckle noise in the reconstruction of kinoforms. Because a kinoform only has phase modulation, the phase freedom of the reconstructed image is usually utilized for spectrum smoothing. We consider the speckle noise as isolated zeros among the discrete reconstructed points. An isolated zero leads to a 2 circle of the image phase differences. Our proposed iterative speckle reduction method changes the image phase to avoid the 2 circles in the reconstructed points. Computer simulations are shown to demonstrate the effect of our method.     

Automated Online Preconcentration System for the Determination of Trace Amounts of Lead Using Pb‐Selective Resin and Inductively Coupled Plasma–Atomic Emission Spectrometry

Abstract

An automated sequential‐injection online preconcentration system was developed for the determination of lead by inductively coupled plasma–atomic emission spectrometry (ICP‐AES). The preconcentration of lead was performed with a minicolumn containing a lead‐selective resin, Analig Pb‐01, which was installed between a selection and a switching valve. In an acidic condition (pH 1), lead could be adsorbed on the resin. The concentrated lead was afterward eluted with 25 µL of 0.06 M nitrilotriacetic acid (NTA) solution (pH 9) and was subsequently transported into the nebulizer of ICP‐AES for quantification. The selectivity of the resin toward lead was examined using a solution containing a mixture of 61 elements. When a sample volume of 5 mL was used, the quantitative collection of lead (≥97%) was achieved, along with an enrichment factor of 19, a sampling frequency of 12 samples hr^?1, a detection limit of 70 pg mL^?1, and a lowest quantification limit of 100 pg mL^?1. The linear dynamic range was 0.1 to 5 ng mL^?1, and the relative standard deviation (n=9) was 0.5% at a 5 ng mL^?1 Pb level. The detection limit of 30 pg mL^?1 and lowest quantification limit of 50 pg mL^?1 could be achieved when 10 mL of sample volume was used. The accuracy of the proposed method was validated by determining lead in the standard reference material of river water (SLRS‐4), and its applicability to the determination of lead in environmental river water samples was demonstrated.     

Precision Controlling of Frequency Difference for Elastic-Stress Birefringence He-Ne Dual-Frequency Lasers

Birefringence-Zeeman dual frequency lasers are capable of producing frequency difference from several kilohertz to hundreds of megahertz, but the precision of giving and stabilizing of the beat frequency still needs improvement to the range of ±200kHz. We design a new elastic force-exerting device comprised of the bottom part, two arms and two pieces of force-exerting sheets. The frequency difference smoothly tuning is realized with this device in a large range of 2MHz to 20MHz. Power-balance frequency stabilization system is used to investigate characters of the temperature, frequency difference and laser power. The precision of the frequency difference has reach up to ±100kHz after system temperature balance. Analyses of the laser frequency difference and power character are carried out.     

Picard–Fuchs Uniformization and Modularity¶of the Mirror Map

Arithmetic properties of mirror symmetry (type IIA-IIB string duality) are studied. We give criteria for the mirror map q-series of certain families of Calabi–Yau manifolds to be automorphic functions. For families of elliptic curves and lattice polarized K3 surfaces with surjective period mappings, global Torelli theorems allow one to present these criteria in terms of the ramification behavior of natural algebraic invariants – the functional and generalized functional invariants respectively. In particular, when applied to one parameter families of rank 19 lattice polarized K3 surfaces, our criterion demystifies the Mirror-Moonshine phenomenon of Lian and Yau and highlights its non-monstrous nature. The lack of global Torelli theorems and presence of instanton corrections makes Calabi–Yau threefold families more complicated. Via the constraints of special geometry, the Picard–Fuchs equations for one parameter families of Calabi–Yau threefolds imply a differential equation criterion for automorphicity of the mirror map in terms of the Yukawa coupling. In the absence of instanton corrections, the projective periods map to a twisted cubic space curve. A hierarchy of “algebraic” instanton corrections correlated with the differential Galois group of the Picard–Fuchs equation is proposed. Received: 14 August 1999 / Accepted: 30 January 2000     

A New Possible Probe for Investigating the Exotic Structure of Neutron-Rich Nuclei by Using the Hanbury-Brown-Twiss Method

Hanbury-Brown-Twiss (HBT) results of the nucleon-nucleon correlation function have been presented for the nuclear reactions with neutron-rich projectiles using an event-generator, i.e. the isospin-dependent quantum molecular dynamics model. A good agreement of our calculation for the two-halo-neutron correlation function of