ALBERT

Notes: Recently, the finline ferrite devices have attracted people's attention. Beyer et al. have done theoretical and experimental researches for a finline isolator.1,2 In order to make it convenient for theoretical design and experimental adjustment of this device, we have developed a synthetical theory and have carried out the experimental research successfully.3 In this paper, we have done the further theoretical analysis and experimental researches for the finline ferrite isolator, such as the impedance matching, the effects of device structure on performances, and the transplantation of a waveguide isolator to a finline isolator problem. Good agreement between design and experiment is obtained. The performances of a X-band finline isolator are as follows A+〈1.5 dB, A−(approximately-greater-than)18 dB, VSWR〈1.5 in a 8% bandwidth, and the bia-field is lower (about 1000 Oe).〈ks〉

Notes: A gravimetric geoid undulation, on a 3’ x 3’ grid has been calculated in the Gulf Stream region: 30°≤φ≤ 45°, 278°≤λ≤ 318°. These undulations were calculated using two 360 potential coefficient models, land, ship and altimeter-derived gravity anomalies, and bathymetric data. Least-squares collocation and fast Fourier transform procedures were used with various data selection and gridding procedures. Results from five different undulation computations are described with comparisons made with synthetic geoid undulations along Geosat tracks in the region. the standard deviation of the undulation differences was ±14 cm when a cubic polynomial was used to model long-wavelength errors. A point verification of the geoid undulation at the laser tracking station on Bermuda was also made with a discrepancy (‘ground truth’ minus model undulation) of 40 cm, within the predicted standard deviation. the gravimetric geoid undulation was used to compute dynamic topography along Geosat tracks for comparison with existing estimates based on hydrographic data in the Gulf Stream region. the agreement between these two estimates is on the order of ±15 cm although the discrepancies can reach 60cm. the larger differences are usually associated with a location on a track that passes near a seamount where the gravity data may be inadequate to represent the high-frequency variations in the geoid undulations. This effect will be represented in the undulation standard deviations that have been calculated using the least-squares collocation procedure. the average accuracy is ±16 cm with the range from ±14 to ±48 cm. the dynamic height derived from the gravimetric undulations and altimeter data has been used to calculate characteristics of the Gulf Stream (width, velocity, centre location, height profile) using an implied velocity model for the set. the results are compared with previous estimates with generally good agreement. However, the maximum velocities and the jump function are approximately 30 per cent larger than previous studies that used an average of altimeter tracks to define the geoid undulation. the dynamic topography was calculated for the entire region using a mean sea surface based on Geos-3, Seasat and Geosat data. the results are compared with two hydrographic estimates due to Martel/Wunsch and LeTraon/Mercier. the agreement is at the ±25 cm level with the best correlation coefficient reaching 0.72 with the Martel/Wunsch model.

Notes: [Auszug] The t(8;21)(q22;q22) translocation is one of the most common genetic abnormalities in acute myeloid leukemia (AML), identified in 15% of all cases of AML, including 40–50% of FAB M2 subtype and rare cases of M0, M1 and M4 subtypes. The most commonly known AML1-ETO fusion protein (full-length ...

Notes: Microstructures and hot deformation behaviors of spray formed superalloy GH742 have been studied in this paper. The results indicate that the spray formed superalloy GH742 has high relative density, low oxygen pickup, refined microstructure, and good forgeability. The fully inhibited coarsening of microstructure in spray formed superalloy GH742 has also been found in this study. 32wt% γ¢ and 0.5wt% carbonitrides, (Nb,Ti)(C,N) and Ti(C,N) were found in the as-deposited GH742, and most of them are sub-micrometer

Notes: The solvent debinding processes of wax-based binders in powder injection moldedTi(C,N)-based cermets were studied. Effects of debinding temperature, debinding time, samplethickness, solvent types and solvent concentration on binder removal were investigated. Also, thedimension change of samples during the solvent debinding process was studied. It can be found thatupwards of 70% paraffin waxes were removed and open pore channels were formed basically whenthe samples were immersed in heptane for 6 h at 50 °C

Notes: Low cyclic behavior of a new type near-α titanium alloy containing rare earth Nd (Ti60) with and without dwell time introduced at maximum tensile strain has been investigated at ambient temperature and 600℃. The results show that, Ti60 alloy exhibits a cyclic softening behavior at almost all strain levels being investigated. The cyclic processes show good agreement with predictions based on the fatigue crackpropagation model. At 600℃, the LCF life of Nd-bearing near-α titanium alloy is superior to that at room temperature within the investigated strain range, which indicates that Ti60 alloy is a good candidate for high temperature component under complicated load and temperature conditions. The results also show that the creep-fatigue interaction is related to the strain range applied. The creep-fatigue fracture is characterized by transgranular fracture mode due to the formation of matrix voids induced by Nd-bearing particles

Notes: CuMgAl hydrotalcite-like compounds with MII/MIII=1 and Cu/Mg molar ratios 3:1, 1:1, 1:3 and 1:19were synthesized by coprecipitation and characterized by elemental analyses, XRD, SEM, FT-IR, TG-DTAand BET surface area test. XRD of all samples showed that Cu/Mg/Al hydrotalcites without any detectableimpurity phase could be obtained at Cu/Mg molar ratios 1:3 and 1:19, however, at high Cu/Mg molar ratios 3:1and 1:1, Al(OH)3 and copper hydroxides or oxides were obtained in the products besides the hydrotalcites,owing to the strong Jahn-Teller effect of Cu2+. It was also found that the crystallinity of the solids increasedwith an increase in copper content. IR results showed that the symmetry of carbonate was reduced from D3hto lower symmetry at high copper content. The thermal stability of the compounds decreased with increasingcopper content, as indicated by TG-DTA measurements. Further thermal decomposition analyses showedthat the surface area reached the maximum at calcination temperature of 500° C and mixed metal oxides withcrystalline MgO, amorphous Al2O3 and highly dispersed CuO were obtained

Notes: Cutting temperature measurement and its variety tendency can reflect cutting toolperformance and machined surface quality directly. By means of a mercury current collector or anelectrical brush device the online measurement of thermoelectric potential of tool-workpiece naturalthermocouple in milling is obtained, based on which a new cutting process real-time monitoringsystem is developed. The system takes the average cutting temperature in tool-workpiece interface asthe monitoring target and the rotation rate of machine spindle as the adjustment object, which leavesout onerous and complex modeling and makes the monitoring and adjustment objective, direct andeffective

Notes: Abstract Three geopotential models (OSU91A, GEM-T3, and GRIM4-C2), available in 1991, have been compared in several ways. The models have been differenced to find the geoid undulation difference are on the order of 1 m in land areas and 30 cm in ocean areas with extreme differences reaching 6 m. The models were also evaluated, augmented by higher degree terms, when necessary, through comparisons with undulations at Doppler and GPS positioned stations. The undulation difference at the Doppler stations was ± 1.57 m with no significant difference between models. Using 4 GPS test areas, differences were seen between the various models. A final comparison was made between geoid undulations implied by a Geosat 17 day cycle and undulations from the three models. The OSU91A model performed best having a difference standard deviation of ±34 cm.

Notes: A kind of brazed monolayer diamond grinding wheel was developed with a relativelyregular distribution of grains on the wheel surface. Grinding performances of this kind of brazedwheel in the surface grinding of cemented carbide were studied. The experiment results show that thegrinding forces ratio becomes higher with the increasing of the maximum undeformed chip thicknessand the specific energy falls with the material removal rate during grinding cemented carbide process.Under certain grinding conditions, the material was removed almost through plastic deformation andgood surface quality is gained. Furthermore, the grits of the brazed diamond grinding wheel failmainly in attritious wear modes other than pull-out ones in conventional electroplated and sintereddiamond tools, which indicates that the strong retention of brazing alloy to the diamond grits andlonger service life of this kind of wheel