Aroma differences are generally sensed in white-and red-fleshed loquats. Here, volatile compounds in four white-and three red-fleshed loquat varieties were investigated by headspace solid-phase microextraction and combined analysis of electronic nose (e-nose) and gas chromatography-mass spectrometry (GC-MS). On total, 83 volatile compounds were identified, and 33 were common in all of the cultivars. D-limonene, hexanal, (E)-2-hexenal, octanal and nonanal were the most abundant volatile compounds. β-cyclocitral and β-ionone were only detected in red-fleshed varieties. Furthermore, Huayu Seedless 1 (triploid white-fleshed loquats) with low levels of terpenoid compounds detected by GC-MS were clearly differentiated from the other cultivars tested by principal component analysis (PCA), which was consistent with the e-nose results. PCA analysis showed that Huabai 1(white flesh cultivar)had a prominent volatile profile characterized by higher concentrations of C6 aldehydes and alcohols, (E)-2-hexanal, (Z)-3-hexenal and hexanal, (Z)-3-hexenol, (E)-2-hexenol and hexanol. On comparison with red-fleshed loquats, white-fleshed loquats were characterized by high aldehydes content. These volatile compounds served to recognize and classify all of the analysed varieties.

This paper designs and implements an automatic grouping method for cascade production planning department and steelmaking plant in organizational production. The original data of group casting in this system is downloaded from SAP system to MES system by production planning department, and then decomposed into batch planning. Production plan data arrives in the database, After automatic calculation, judgment and other processing, the system triggers the next step of furnace group pouring operation. The whole process can timely and accurately form furnace number and pouring number data, and has traceability and data coherence. Triggering the next process execution improves the efficiency of information flow transmission. It solves the problem that the number of stoves and pouring times are not timely, rigorous, traceability and coherence are not enough in the process of organizing production in steelmaking plants.

Magnesium alloys are becoming more and more attractive because of their low density, high specific stiffness and strength, good heat conductivity, high electromagnetic interference shielding and damping capabilities, etc. Magnesium alloy components produced by semi-solid processing (SSP) has the merits of high dimension stability and quality. Moreover, it is desirable to apply the SSP technology to produce components free of gas holes and porosity which are usually found in those produced by the die casting. SSP of magnesium alloys has been utilized in Japan and Taiwan, China. In this paper, preparing methods of semi solid slurry appropriate for magnesium alloys are introduced, including stirring, SSIT-semi solid isothermal heat treatment, pouring temperature controlling, grain refinement and so on. The effects of process parameters on the microstructure of semi-solid slurry are also discussed. In addition, thixomolding technology practically utilized in the semi-solid processing of magnesium alloys is also introduced. At last the prospect of Semi-solid processing technologies for magnesium alloys are discussed.

Vacuum aluminothermic reduction of magnesia is multi-phase chemical reaction and the briquette forming condition has a great influence on the extent of the reactions. This paper focused on the effect of briquette forming condition on the extraction of magnesium from calcined magnesite. Briquettes were prepared at different conditions, including two forming pressures, four briquette thicknesses and two briquette diameters. The reduction ratio was calculated from the weight loss of the briquette before and after thermal reduction. The obtained condensed magnesium and briquette residues were mainly characterized via X-ray diffraction analysis and scanning electron microscopy. It was revealed that the briquette preparation condition had a great influence on the reduction ratio of magnesia and the phase constitution of the briquette residues, but had a minor influence on the morphology of condensed magnesium.

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