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| 1 | Improving Joint Morphologies and Tensile Strength of Al/Mg Dissimilar Alloys Friction Stir Lap Welding by Changing Zn Interlayer Thickness显示文摘The pure Zn foils with different thicknesses(0.02, 0.05, 0.1, 0.2 and 0.3 mm) were selected as interlayers to improve the quality of friction stir lap welding joint of 7075-T6 Al and AZ31 B Mg dissimilar alloys. The effects of the interlayer thickness on joint formation, microstructure and tensile strength were analyzed. The results displayed that the maximum length of the boundary between stir zone(SZ) and thermo-mechanically affected zone in lower plate was obtained by the addition of the Zn interlayer with 0.05 mm thickness. The Mg–Zn intermetallic compounds(IMCs) were discontinuously distributed in the SZ, replacing the continuous Al–Mg IMCs. The size of Mg–Zn IMCs increased with the increase in the thickness of the Zn interlayer. The maximum tensile shear strength of 276 N mm-1 was obtained by the addition of 0.05 mm Zn foil, which increased by 45.6% of that of the joint without the Zn foil addition. | Jinglin Liu Shiyu Niu Rong Ren Shude Ji Lei Wang Zan Lv | 2019 | Acta Metallurgica Sinica(English Letters)2019，32，11： | 5 |
| 2 | Functional outcomes of bicondylar tibial plateau fractures treated with dual buttress plates and risk factors:a case series显示文摘 | Yao Y Lv H Zan J | 2014 | Injury2014，45，12： | 1 |
| 3 | Secure coordinated direct and untrusted relay transmissions via interference engineering显示文摘This paper investigates the physical layer security issue of the coordinated direct and untrusted relay transmissions, considering both uplink and downlink scenarios. To effectively prevent the untrusted relay from eavesdropping on the confidential information it receives, two novel interference-assisted jamming schemes are proposed, where the inter-user interference and the artificial noise are intelligently engineered to degrade the signal reception quality at the untrusted relay, therefore enhancing the physical layer security for the uplink and downlink coordinated transmission, respectively. For each of the two proposed jamming schemes, a lower bound for the ergodic secrecy sum rate(ESSR) is derived in closed form to evaluate the secrecy performance. To obtain more system design insights, we further provide an asymptotic analysis for the ESSR scaling laws over the regimes of the high signal-to-noise ratio and a large number of antennas at the base-station. We carry out computer simulations to confirm the accuracy of the derived theoretical analysis.Our simulation results show that the proposed jamming schemes achieve a similar asymptotic performance limit to the case of using a trusted relay. Moreover, the proposed jamming schemes guarantee perfect security for both uplink and downlink coordinated transmissions, and yield a significant ESSR improvement compared with three other baseline schemes. | Lu LV Zan LI Haiyang DING Yuchen ZHOU Jian CHEN | 2022 | Science China(Information Sciences)2022，65，8： | 1 |
| 4 | Neuronal injury and brain-derived neurotrophic factor expression in a rat model of amygdala kindling seizures Differences in brain regions and kindling courses显示文摘BACKGROUND:Studies have demonstrated that brain-derived neurotrophic factor(BDNF) has a dual effect on epilepsy.However,the relationship between epilepsy-induced brain injury and BDNF remains poorly understood.OBJECTIVE:According to ultrastructural and molecular parameters,to detect the degree of neuronal injury and BDNF expression changes at different brain regions and different kindling times to determine the effects of BDNF on epilepsy-induced brain injury.DESIGN,TIME AND SETTING:A randomized,controlled,animal experiment based on neuropathology and molecular biology was performed at the Department of Physiology and Department of Pathology,Basic Medical College of Jilin University in 2003.MATERIALS:UltraSensitive SP kit for immunohistochemistry(Fuzhou Maxim Biotechnology,China),BDNF antibody(concentrated type,Wuhan Boster Biological Technology,China),JEM-1000SX transmission electron microscopy(JEOL,Japan),and BH-2 light microscope(Olympus,Japan) were used in the present study.METHODS:Wistar rats were randomly assigned to control(n = 6),sham-surgery(n = 6),and model(n = 60) groups.The control group rats were not treated;an electrode was embedded into the amygdala in rats from the sham-surgery and model groups;an amygdala kindling epilepsy model was established in the model group.MAIN OUTCOME MEASURES:Pathological changes in the temporal lobe and hippocampus were observed by light and electron microscopy at 1,3,7,14,and 21 days following kindling,and BDNF expression in the various brain regions was determined by immunohistochemistry.RESULTS:In the model group,temporal lobe cortical and hippocampal neurons were swollen and the nuclei were laterally deviated.There were also some apoptotic neurons 3 days after kindling.The nucleoli disappeared and the nuclei appeared broken or lysed,as well as slight microglia hyperplasia,at 7 days.Electron microscopic observation displayed chromatin aggregation in the nuclei and slight mitochondrion swelling 3 days after kindling.Injury changes were aggravated at 7 days,characterized by broken cytoplasmic membrane and pyknosis.With the development of seizure,the number of BDNF-positive neurons in the hippocampus and temporal lobe increased and peaked at 7 days.Moreover,hippocampal and cortical temporal lobe injury continued.Following termination of electrical stimulation after 7 days of kindling,BDNF expression decreased,but continued to be expressed,up to 21 days of kindling.In addition,the number of temporal and hippocampal BDNF-positive neurons was greater than the control group.CONCLUSION:Brain injury and BDNF expression peaked at 7 days after kindling,and hippocampal changes were significant. | Weihong Lin Hongmei Meng Yudan Lv Zan Wang Na Li Li Cui Baimin Zhang | 2010 | Neural Regeneration Research2010，5，8： | 1 |
| 5 | Brain-derived neurotrophic factor expression is higher in brain tissue from patients with refractory epilepsy than in normal controls显示文摘The role of the brain-derived neurotrophic factor in epilepsy remains controversial.The present study utilized light and electron microscopy to investigate pathological and ultrastructural changes in brain tissue obtained from the seizure foci of 24 patients with temporal epilepsy.We found that epileptic tissue showed neuronal degeneration,glial cell proliferation,nuclear vacuolization,and neural cell tropism.Immunoelectron microscopy and immunohistochemistry showed that brain-derived neurotrophic factor was expressed at significantly higher levels in patients with refractory temporal epilepsy compared with normal controls,demonstrating that the pathological changes within seizure foci in patients with refractory epilepsy are associated with brain-derived neurotrophic factor expression alterations. | Yudan Lv Jiqing Qiu Zan Wang Li Cui Hongmei Meng Weihong Lin | 2011 | Neural Regeneration Research2011，6，29： | 0 |
| 6 | Secure NOMA and OMA coordinated transmission schemes in untrusted relay networks显示文摘Dear editor,Safeguarding physical-layer non-orthogonal multiple access(NOMA)transmissions using relays has been received widespread attention[1,2].However,a relay may be datalevel untrusted and serve as an eavesdropper to decode its forwarded messages.Hence,information security needs to be guaranteed if an untrusted relay is involved. | Lu LV Zan LI Haiyang DING Jian CHEN | 2021 | Science China(Information Sciences)2021，64，10： | 0 |
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