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- Author or Editor: Yu Hao x
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Abstract
Thermal insulation and fire protection have been a point of interest and discussion for several decades. Due to its excellent performances, basalt fiber has been widely used in the fields of thermal insulation and fire protection. The morphological structure and thermal stability of continuous basalt fiber were analysed using CH-2 projection microscope, scanning electron microscope (SEM) and thermogravimetry (TG). In order to evaluate the thermal radiation protective performance when exposed to fire environment, the spectral reflectances of nonwoven fabrics with different thicknesses were evaluated by ultraviolet-visible-near infrared (UV–Vis–NIR) spectrophotometer analysis. The jointly analysis of TG and UV–Vis–NIR spectrophotometer revealed that the basalt fiber exhibits good thermal stability, and the nonwoven fabrics present excellent thermal protective performance.
Abstract
SBA-15 materials were synthesized through the hydrothermal method. The SBA-15 prepared at the hydrothermal time of 24 h possessed a higher surface area and a good hexagonal structure, so it was used as the catalytic support in this experiment. The base metals (Cu, Co, Ni) coated on SBA-15 were prepared for toluene removal. The results revealed that the catalytic activity of Cu/SBA-15 for toluene removal was about 70% at 250 °C, which was the best among the three catalysts. The modification of Cu/SBA-15 by adding different transition metals (Ce, Co, Ni, Mn) to improve the removal efficiency of toluene and NO was also investigated in this study. The results indicate that the catalytic activity of Mn–Cu/SBA-15 for toluene removal was about 100% at 250 °C. The toluene as a reductant on the removal of NO was also determined. Furthermore, the catalytic activity of Mn–Cu/SBA-15 for NO removal can reach about 70% at 300 °C when toluene is used as reductant.
Abstract
There is ongoing debate about which skills translation students require for employment. Numerous “bridge the gap” studies draw on translation professionals in order to list the skills that graduates should have acquired. However, many of the available surveys indicate, with some regularity, that only a minority of graduates from Master’s programs in translation actually find stable employment in the translation industry. Here we report on a survey of graduates from the University of Melbourne and the skills that they say they require once in employment. The graduates who are employed in the translation industry prioritize skills that are significantly different from those prioritized by graduates employed in other sectors. This raises an underlying question of whether we are training for an industry or for society.
Abstract
A low cost spectrum multiscaling analyzer system based on an IBM PC is described. Interrupt service routines were used to handle both the digital data converted by ADC and record the dead time profile. A dead time counter was provided to handle the dead time problem by counting the busy time of amplifier and ADC, which is important in correcting the decay rate of the short-lived nuclides during the counting interval.
Abstract
The short-lived bromine and iodine isotopes from thermal neutron fission of235U have been separated from fission products by one step solvent extraction combined with an ion exchange fast chemistry system. The measured gamma spectra have been acquisited by an automatic computer on-line system. The results include experimental independent fission yields of86Br,134mI,134gI,136mI, and136gI, the cumulative yields of87Br,88Br,137I,138I. The isomeric yield ratio of134I and136I has been determined and the iodine isotopic distribution curve has been constructed and analyzed.
Abstract
A low cost and simple configuration of multifunctional MCA based on a personal computer is described. It can be used as a spectrum multiscaling analyzer, multi-input pulse height analyzer and dual parameter MCA. It can also be used in a master-slave ADC configuration in order to cut down the dead time of the system. All the functions can be performed by loading the corresponding programs without altering the hardware configuration. Interrupt service routines are used to handle the digital data converted by ADC. A dead time counter is also provided to record the dead time profile by measuring the ADC busy time.
BTATz-CMDB propellants
High-pressure thermal properties and their correlation with burning rates
Abstract
The high-pressure thermal properties and their correlation with burning rates of the composite modified double base (CMDB) propellants containing 3,6-bis (1H-1,2,3,4-tetrazol-5-yl-amino)-1,2,4,5-tetrazine (BTATz), a substitute of hexogen (RDX), were investigated using the high-pressure differential scanning calorimetry (PDSC). The results show that there is a main exothermal decomposition process with the heating of each propellant. High pressure can restrain the volatilization of NG, accelerate the main decomposition reaction, and make the reaction occur easily. High pressure can change the main decomposition reaction mechanism function and kinetics, and the control process obeys the rule of Avrami–Erofeev equation at high pressure and chemical reaction at normal pressure. However, the mechanism function can not be changed by the ballistic modifier. The correlation between PDSC characteristic values and burning rates was carried out and found that u and 
keep a good linear relation, k
u
keeps a similar changing trend with u, and it can be used to study the effect of the ballistic modifier or the other component on the burning rates.
The objective of the present study was to understand the developmental regularity of wheat endosperm cells at different Days After Pollination (DAP) using microscopic and histochemical methods. Resin semi-thin sections of the endosperm and the enzymatically dissociated Starchy Endosperm Cells (SECs) were observed under a light microscope. The results showed that: (1) SECs were irregular-shaped and had two types of starch granules: large oval-shaped A-type starch granules and small spherical B-type starch granules. (2) The growth shape of SECs was referred to as S-curve and the fastest cell growth period was at 16–24 DAP. (3) The largest increase and growth of A-type starch granules were mainly at 4–16 DAP. B-type starch granules increased rapidly after 16 DAP and made up over 90% of the total starch granules in SEC during the late stage of endosperm development. (4) The nuclei of SEC deformed and degenerated during the middle and late stages of endosperm development and eventually disappeared. However, starch granules still increased and grew after the cell nuclei had degenerated. The investigations showed the development regularity of starch endosperm cells and starch granules, thereby improving the understanding of wheat endosperm development.
