Materials Literature
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Using 1,4-butanediol as initiator,boron trifluoride etherate as catalyst and CH2Cl2 as solvent,poly(3-nitratomethyl-3-methyl oxetane)(PNIMMO) was prepared by 3-nitratomethyl-3-methyloxetane via cationic ring-opening polymerization.The effect of molar ratio for catalyst and initiator,reaction temperature and the droppi…
In order to explore the relationship between parameters of UHF signals and discharge magnitude of pulse current in partial discharge(PD)detection in oil-paper insulating power equipment,the differences of principle between current pulse measurement and UHF measurement in PD is introduced.Four typical PD models are con…
LS-DYNA3D finite element code was employed to simulate the detonation drive of a certain high explosive projectile with prefabricated fragments,and Euler fluid coupled Lagrange rigid body method and discrete fragments model building method were adopted in essence.At the global coordinate system,the flight velocity and…
ESR measurements under tensile deformation of vulcanized rubber were carried out by the combination of homebuilt stretching machine with commercially available ESR spectrometer. The changes of radical concentrations during tensile deformation were successfully evaluated by this technique. It was found that the destruc…
Methyl ethyl ketone peroxide (MEKPO) has highly reactive and unstable exothermal features. In recent years, it has caused many thermal explosion and runaway reaction accidents in manufacturing processes. Hydrogen peroxide (H2O2), dimethyl phthalate (DMP), and methyl ethyl ketone (MEK) were applied to manufacture MEKPO…
In the absence of any solvent, the reactions of various aromatic aldehydes with 5,5-dimethyl-1,3cyclohexanedione catalyzed by methanesulfonic acid under thermal heating conditions smoothly afforded 9-aryl-3,3,6,6-tetramethyl-tetrahydroxanthene-1,8-diones in nearly quantitative yields. Under the same melting conditions…
Ag doped ZnO films (ZnO：Ag) were deposited on quartz glass substrates by ultrasonic spray pyrolysis technology. Zn(CH3COO)2 and Ag(NO3)3 aqueous solution were used as the sources of Zn and Ag， respectively. The effect of substrate temperature on structural， electrical and optical properties of ZnO：Ag films were studie…
We have developed sample pretreatments for silk for radiocarbon dating. Characteristics of silk under different types of pretreatment were investigated, as well as the behavior of dye and possible contaminants. We found that dye could be removed completely, together with all other foreign materials bigger than 1.2 μm,…
The reaction of Ta metal with potassium nitrate melts at 600 o C has been studied. It was established that the composition of the reaction product could be varied by an appropriate choice of the base-acid properties of the melt, which were regulated by additions of potassium hydroxide. Pure potassium metatantalate KTa…
Supercapacitors in parallel with lead-acid batteries provide greater capacity in lesser volume; cold cranking improves. Lower effective series resistance (ESR) gives greater net capacity. Laboratory experiments and road tests on reduced-volume batteries ganged with supercapacitors demonstrate the practical and economi…
SnO 2 -doped Si nanorings with an outer diameter of 25 nm and an average width of 5 nm are grown by pulsed laser deposition. Atomic force microscopy reveals several interesting self-assembling forms of polycrystalline as well as an amorphous type of silicon nanorings. Depending on the width of the ring, the optical ba…
Among the many reasons for the failure of high-voltage apparatus, the knowledge about a possible leakage of SF6 gas in the switchgear encapsulation is of crucial importance. It is therefore necessary to monitor the SF6 gas to increase system reliability and to address the concerns of growing environmental awareness. T…
−1 . The absence of boroxol ring (806 cm −1 ) in the present glass system suggested that these glasses consist of randomly connected BO3 and BO4 units. The conversion of BO3 to BO4 and VO5 to VO4 tetrahedra along with the formation of non-bridging oxygen’s (NBOs) attached to boron and vanadium takes place in the glass…
The transmittance is studied for a Cantor-like multibarrier system. The calculation are made in the framework of effective mass theory. Some typical values of effective masses and potentials are used in order to have an experimental reference. The techniques of Transfer Matrix are used to calculate the transmittance o…
BHS, Bridge High-performance Steels, produced by the recent advanced steel making technologies such as thermo-mechanical control process were developed. The BHS contribute to the economical design, efficient fabrication and higher performance of steel bridges. BHS has excellent properties such as high strength, high f…
After two decades since the discovery of the high- T c copper oxides, we have been gifted a new option for finding higher T c superconductors. The new high- T c iron-based compounds apparently belong to an entirely different class of materials from the `old' cuprates. Nevertheless, several similarities between the two…
Abstract The synthesis and characterization of three new porphyrin‐peptidyl‐phosphonate derivatives, containing a diphenyl 3‐pyridylmethyl‐phosphonate moiety, is described. These compounds could serve as potential photosensitizers for the PDT method of tumor therapy and displayed activity as inhibitors of aminopeptida…
The availability of cheap and reliable supply of electrical energy plays very important role in the economic development and social welfare of any society. Overhead power transmission lines cross regions which are different in environmental conditions. The reliable and uninterrupted operation of modern power system de…
Effective utilization of biomass resource rapidly has been promoting since the government adopted the ‘Biomass Nippon’ strategy at a cabinet meeting in 2002. Especially, the energy conversion technology of applying biomass has been expected from a point of view of environment and resource conservation. However, the en…
The structure of sodium lead apatite Na2Pb8(PO4)6 has been determined using single-crystal X-ray diffraction. Crystal data are: hexagonal, space group P63/m, Z = 1, a = 972.1(4) pm, c = 718.6(5) pm, V = 588.1(5) 106 pm3, and R = 0.038. The result of charge distribution analysis confirmed the structural hypotheses.In t…