Zhang M.,Jilin University |
Zhang M.,Beihua University |
Liu H.,Jilin University |
Li Q.,Jilin University |
And 5 more authors.
Physical Review Letters | Year: 2015
We solve the crystal structure of recently synthesized cubic BC3 using an unbiased swarm structure search, which identifies a highly symmetric BC3 phase in the cubic diamond structure (d-BC3) that contains a distinct B-B bonding network along the body diagonals of a large 64-atom unit cell. Simulated x-ray diffraction and Raman peaks of d-BC3 are in excellent agreement with experimental data. Calculated stress-strain relations of d-BC3 demonstrate its intrinsic superhard nature and reveal intriguing sequential bond-breaking modes that produce superior ductility and extended elasticity, which are unique among superhard solids. The present results establish the first boron carbide in the cubic diamond structure with remarkable properties, and these new findings also provide insights for exploring other covalent solids with complex bonding configurations. © 2015 American Physical Society.
Yu D.-H.,Northeast Normal University |
Yu X.,Northeast Normal University |
Wang C.,Beihua University |
Liu X.-C.,Northeast Normal University |
Xing Y.,Northeast Normal University
ACS Applied Materials and Interfaces | Year: 2012
In this paper, TiO 2/Ag sponge-like nanostructure composites have been prepared by the surface solgel method with the template of natural cellulose, which is relatively simple, low-cost, and environmentally friendly. The Ag nanoparticles are deposited on the TiO 2 nanosponges through UV irradiation photoreduction of silver nitrate solutions. The physicochemical properties of as-prepared composites are characterized by XRD, BET, SEM, TEM, XPS and UVvis DRS techniques. The UV-light photocatalytic activities of the composites are evaluated through the photodegradation of two model organic molecules including RhB and salicylic acid. The experimental results show that the photocatalytic activities of TiO 2/Ag nanosponge composites are superior to that of P25, pure TiO 2 nanoparticle aggregates synthesized by the hydrothermal method and pure TiO 2 nanosponge. The superior activities of TiO 2/Ag nanosponge composite photocatalysts can be attributed to the unique nanosponge morphology, uniform dispersion of Ag nanoparticles, and strong interaction between Ag and TiO 2 nanosponges. © 2012 American Chemical Society.
Liu T.K.,Beihua University
Zhonghua xin xue guan bing za zhi | Year: 2011
To observe the effect of ischemia postconditioning during the first minutes of reperfusion for the myocardial reperfusion injury in ST-segment elevation acute myocardial infarction (STEMI) patients undergoing emergency percutaneous coronary intervention (PCI). STEMI patients undergoing emergency PCI in affiliated hospital of Beihua University between October 2006 and January 2009 were randomly divided into two groups: the control group (n = 34) without any intervention after PTCA, and the postconditioning group (n = 30) with ischemia postconditioning within first minutes of reflow by 3 episodes of 30-second inflation and 30-second deflation with the angioplasty balloon. Reperfusion arrhythmias, CK and CKMB, corrected TIMI frame count (CTFC), wall motion score index (WMSI) and left ventricular ejection fraction (LVEF) by echocardiography were compared between the two groups. MI areas were evaluated with the ECG-54 criteria/32 system and myocardial blush grade (MBG) was measured. The incidence of reperfusion arrhythmias-frequent ventricular premature (26.7% vs. 52.9%) and short array ventricular tachycardia beat (23.3% vs. 58.8%) as well as values of peaks CK [(1162 ± 548) U/L vs. (1732 ± 480) U/L, P < 0.01], CKMB [(165 ± 70) U/L vs. (280 ± 99) U/L, P < 0.01], CTFC (22.23 ± 3.81 vs. 26.97 ± 3.42), WMSI (1.27 ± 0.52 vs. 1.82 ± 0.83), and infarction areas determined by ECG methods (10.60% ± 4.97% vs.14.65% ± 6.88%, all P < 0.05) were all significantly lower in the postconditioning group than in control group while LVEF (0.55 ± 0.08 vs. 0.47 ± 0.10) and MBG (2.27 ± 0.64 vs. 1.47 ± 0.61, all P < 0.05) were significantly higher in the postconditioning group than in control group. Ischemia postconditioning can significantly reduce myocardial reperfusion injury in patients with STEMI.
Zhu H.-Y.,Beihua University
World Transactions on Engineering and Technology Education | Year: 2015
Such outstanding problems as lack of user participation, low resource-sharing and inconvenient retrievals still exist in the construction of digital learning resources in China. Using a questionnaire, the demand and application of current digital learning resources in colleges and universities was analysed, and the problems in the current construction of digital learning resources identified. Based on the analysis and to address the identified problems, a system for the construction of learning resources in a participatory digital library based on Moodle was developed and is presented in this article. © 2015 WIETE.
Liu Y.B.,Beihua University
Zhonghua nan ke xue = National journal of andrology | Year: 2011
To investigate the expressions of survivin and GRIM-19 in prostatic cancer tissue and their clinical implications. We detected the expressions of survivin and GRIM-19 in the tissues of normal prostate (NP), benign prostate hyperplasia (BPH) and prostate cancer (PCa) using immunohistochemical staining, RT-PCR and Western blot, and processed the data by SPSS12. The positive rates of survivin expression were 6.25% , 18.18% and 90.62% in NP, BPH and PCa (P < 0.01), while those of GRIM-19 were 87.50%, 81.82% and 9.37% , respectively (P < 0.01). Semiquantitative RT-PCR and immunohistochemical staining showed that both survivin mRNA and survivin expressions were highly positive in PCa but negative in NP and BPH. Western blot exhibited that the survivin protein was expressed strongly in PCa but weakly in NP and BPH, while the GRIM-19 protein was expressed just contrariwise (P < 0.01). The expressions of survivin and GRIM-19 may be closely correlated with the pathogenesis of prostate cancer.