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Zhao S.,University of Science and Technology of China | Qingmin C.,Shandong Agriculture and Engineering College | Fu M.,University of Science and Technology of China | Yang X.,University of Science and Technology of China | And 2 more authors.
Quality Assurance and Safety of Crops and Foods

The effects of exogenous ethylene generated by solid ethylene-releasing agents on carbohydrate metabolism and sprouting in potato tubers at 15 °C were investigated in this study. Potato tubers were randomly divided into 4 groups, and treated with 0, 1, 2, and 3 bags of solid ethylene-releasing agents. The initial time of potato tuber sprouting and sprouting index were recorded. The rate of respiration, total sugar, total reducing sugar, starch, fructose, glucose, and sucrose content during the sprouting were determined. Our result indicated that exogenous ethylene inhibited the sprouting of potato tubers (sprout index from 0.583 to 1.125), whereas little effect on the initial time of sprouting was observed. Moreover, exogenous ethylene enhanced respiration slightly (less than 8.2%), elevated the total sugar (from 17.73 to 32.58 mg/g) and reduced sugar levels (from 0.23 to 4.43 mg/g). Nevertheless, the starch, glucose, and fructose content varied minimally. The sucrose content was decreased significantly by exogenous ethylene. Therefore, exogenous ethylene treatment could inhibit the potato sprouting process, and a dose-dependent relationship was observed between exogenous ethylene and sprouting index. The inhibitory effect of sprouting was related to carbohydrate metabolism, including changes in the total sugar, total reducing sugar, and sucrose content, to some extent. © 2014 Wageningen Academic Publishers. Source

Sui R.J.,Shandong Agriculture and Engineering College | Chen S.Y.,Shandong University | Zhou C.,Dalian Boiler & Pressure Vessel Inspection & Research Institute | Liu H.B.,Dalian Boiler & Pressure Vessel Inspection & Research Institute | Chu Y.H.,Dalian Boiler & Pressure Vessel Inspection & Research Institute
Advanced Materials Research

Temperature and operating pressure are important to stress corrosion cracking (SCC) of stainless steel. The SCC susceptibility of 18-8 type austenitic stainless steel, 06Cr18Ni11Ti (S32168), in an environment containing hydrogen chloride was assessed using the slow strain rate tensile (SSRT) test under different temperature and operating pressure. Results of the SSRT test indicated that the impact of operating pressure on the SCC susceptibility was different at different temperatures. The correlation degrees of temperature and operating pressure to SCC susceptibility were calculated using the grey relational theory. The correlation degree of temperature to the SCC susceptibility was greater than that of operating pressure to the SCC susceptibility. © (2014) Trans Tech Publications, Switzerland. Source

Sui R.,Shandong University | Sui R.,Engineering and Technology Research Center for Special Equipment Safety of Shandong Province | Sui R.,Shandong Agriculture and Engineering College | Wang W.,Shandong University | And 5 more authors.
Engineering Failure Analysis

Leakage at the tube-to-tubesheet joints occurred in a waste heat boiler. The mode and the root cause of the failure were investigated by chemical composition analysis of the tube material, metallographic structure and crack observation, and corrosion product analysis of the damaged tubes, as well as the operation condition examination of the waste heat boiler. Results revealed that failure of the tubes occurred due to the stress corrosion cracking (SCC), which was caused by tensile stress and chloride-buildup in the narrow and long gap between the tube and tubesheet hole. The gap formation was further analyzed by comparison of the minimum expansion pressure from the common formula provided by the manufacturer, with that from finite element method computations. It is found that the minimum expansion pressure used in manufacture is small and cannot eliminate the initial gap. Meanwhile, the enrichment of chloride in the gap was briefly discussed. © 2014 Elsevier Ltd. Source

Chen Q.,Shandong Agriculture and Engineering College | Fu M.,University of Science and Technology of China | Qu Q.,University of Science and Technology of China | Dai H.,Shandong Agriculture and Engineering College | Zhao S.,University of Science and Technology of China
Quality Assurance and Safety of Crops and Foods

Effect of two blanching methods (blanching in steam or in hot water), on antioxidant properties of daylily flowers were determined with antioxidant assays, including 1-diphenyl-2-picrylhydrazyl free radical scavenging, superoxide anion scavenging activity, reducing power and nitric oxide radical-scavenging. Antioxidant compounds, such as phenolic composition, ascorbic acid and ß-carotene were also analysed. Results showed that the phenolic compounds, ß-carotene, ascorbic acid and antioxidant activities in daylily flowers were affected significantly by blanching pre-treatments. Blanching enhanced antioxidant activities and (+)-catechin content, and resulted in great reduction of ß-carotene, ascorbic acid, but steam blanching had the higher antioxidant activity and related compound contents than those of hot water blanching. A significant positive correlation between antioxidant activity and (+)-catechin content was observed in this work. Overall, steam blanching would be a better choice for daylily flower pre-treatment than blanching in hot water. © 2014 Wageningen Academic Publishers. Source

Peng L.,Shandong Agriculture and Engineering College
Advanced Composites Letters

This work is based on the dry sliding wear of Stellite 4-FeSi-B4C composites deposited on a TA10 titanium alloy using a Laser melting deposition (LMD) technique, the parameters of which are such as to provide almost crack-free composites with very low porosity. To our knowledge, it is the first time that Stellite4-FeSi-B4C mixed powders are deposited as the hard composites by the LMD technique. Scanning electron microscope results indicate the nanoscale particles and nanorods are produced in such composites. Furthermore, due to the characteristics of the laser technology, the ultrafine nanoscale polycrystalline phases can be easily produced. Compared with a TA10 alloy substrate, the improvements of the micro-hardness and wear resistance are obtained for such composites. Source

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