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1

Experimental study temperature evolution of pseudoelastic TiNi alloys during shock-induced phase transformation

Shen L., Liu Y., Shan J.

Archives of Mechanics

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2018

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Vol. 70, nr 3

191--205

EN

The temperature evolution and the mechanical characteristics of pseudoelasticity TiNi alloys have been studied experimentally at different strain rates. During SHPB testing, the temperature changes were in situ measured by an infrared system recording infrared radiation emitted from the surface of the specimen. It was found that the temperature evolution and the mechanical behavior has a remarkable strain rate effect. With the strain rate increasing, both phase transition subsequent stress and modulus of loading the phase transition stage were higher, exhibiting significant strain and the strain rate hardening characteristic. They were accompanied by the temperature increasing, which suggest that the stress increments result from the temperature change, independently of the strain rate. Calculation analysis results show that latent heat and the dissipated energy in the form of the hysteresis loops, are mainly the sources of the temperature change.

2

Research on Improved LEACH Protocol of Wireless Sensor Networks

Shan J., Dong L., Liao X., Shao L., Gao Z., Gao Y.

Przegląd Elektrotechniczny

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2013

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R. 89, nr 1b

75--77

EN

This investigation was performed to see if the improved LEACH protocol operates more effectively than the traditional LEACH protocol. The improved protocol adds energy factor and distance factor to the threshold T(n). The multi-hop routing algorithm of cluster head is introduced too, it based on the hop count and the remaining energy. MATLAB was used to simulate. The simulation data suggests that the death rate of nodes of the improved protocol was lower than the traditional one. It is concluded that the improved LEACH protocol can balance network load and extend the life-cycle of network.

PL

Zbadano efektywność pracy udoskonalonego, w stosunku do tradycyjnego, protokołu hierarchicznego klastrowania LEACH. Udoskonalenie protokołu polega na wprowadzeniu współczynników energii i odległości węzłów oraz wykorzystaniu ich przy obliczaniu wartości progowej T(n). Zastosowano również wielo-przeskokowy algorytm klastrowania węzła głównego. Algorytm działa na zasadzie liczenia przeskoków i zachowania energii. Do symulacji wykorzystano program MATLAB. Wyniki symulacji wykazują, że tempo uszkodzeń węzłów przy zastosowaniu udoskonalonego protokołu jest mniejsze niż w przypadku tradycyjnego. Podsumowując, udoskonalony protokół LEACH może zrównoważyć obciążenie i wydłużyć okres życia sieci.

3

New application of mixed C18 -SCX SPE clean-up in gas chromatographic-mass spectrometric determination of six β 2 -agonist residues in pig's liver

Shan J., Pan C., Zhang J., Niu W.

Acta Chromatographica

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2008

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Vol. 20, no. 1

43-57

EN

A new mixed C18-SCX SPE column and gas chromatography-mass spectrometry have been used for determination of six β 2-agonists residues in pig's liver. After hydrolysis, the six β 2-agonists were extracted with 6:4 (v/v) ethyl acetate-isopropanol and then cleaned on a commercial mixed-adsorbent solid-phase extraction column. The eluted solution was analyzed by gas chromatography-mass spectrometry (GC-MS) and quantified by the external standard method. Sample pre-treatment and GC-MS conditions were critically examined. The linear range was 0.005-2.00 mg L-1 and correlation coefficients were 0.9987-1.000. The LOD of mabuterol, clenbuteroland, and salbutamol was 0.2 µg kg -1. Average recoveries of these three compounds from spiked pig's liver ranged from 65.3 to 95.8% and relative standard deviations were between 5.4 and 9.9%. The LOD of cimaterol, bromobuterol, and ractopamine was 0.3 µg kg -1. Average recoveries of these three compounds from spiked pig's liver ranged from 63.8 to 88.1% and relative standard deviations were between 5.0 and 9.7%. These results indicate the method is highly sensitive, simple, inexpensive, and results in good purification. It could also meet requirements for analysis of pig's urine in domestic and import/ export inspection work.