激光冲击强化改善Ti-6Al-4V合金冲击磨损性能（英文）

采用自制的冲击磨损实验台研究激光冲击强化工艺(LSP)对Ti-6Al-4V 合金冲击磨损性能的影响,并对材料强化后的显微组织及力学性能进行分析。通过冲击磨损实验研究样品在不同冲击动能作用下的动能吸收、冲击力、磨损接触时间和磨损机理。实验结果表明,经激光冲击强化后,Ti-6Al-4V 合金表面的显微硬度、弹性模量和内部残余压应力等均得到显著提高,其磨损抗性也得到显著改善,且强化能量越高,其改善效果越明显。此外,样品的磨损机理为磨粒磨损、氧化磨损和疲劳剥落。

La_5Mg_(95-x)Ni_x(x=5、10、15)合金的显微组织、储氢热力学和动力学性能（英文）

研究Ni含量对La_5Mg_(95-x)Ni_x(x=5、10、15)三元合金的显微组织、热力学和动力学性能的影响。采用XRD和SEM探索合金的相和组织的变化情况,采用自动Sievert设备测试合金吸放氢性能曲线和PCI曲线。研究表明,随着Ni含量的增加,合金的储氢动力学性能得到提高,但是合金的储氢容量有所下降。三种成分的合金中,La_5Mg_(80)Ni_(15)合金表现出最低的放氢活化能以及最高的吸放氢速率,其放氢活化能为57.7kJ/mol。通过测定合金PCI曲线和van’tHoff方程发现,随着Ni含量的增加,合金的热力学性能先提高后降低,其中La_5Mg_(85)Ni_(10)表现出最优异的热力学性能,其焓和熵的数值分别为-72.1 kJ/mol和-123.2J/(mol·K)。

Value of long non-coding RNA Rpph1 in esophageal cancer and its effect on cancer cell sensitivity to radiotherapy

BACKGROUND Esophageal cancer is a common digestive tract tumor that is generally treated with radiotherapy.Poor responses to radiotherapy in most patients generally result in local radiotherapy failure,so it is essential to find new radiosensitizers that can enhance the response of cancer cells to radiotherapy and improve the survival of esophageal cancer patients with radiation resistance.The long noncoding RNA(lncRNA)Rpph1 is highly expressed in human gastric cancer tissues,and represses breast cancer cell proliferation and tumorigenesis.However,the expression of lncRNA Rpph1 in esophageal cancer and its relationship with radio-sensitivity has not been studied.AIM To explore the value of lncRNA Rpph1 in esophageal cancer and its effect on cancer cell sensitivity to radiotherapy.METHODS Eighty-three patients with esophageal cancer admitted to Qilu Hospital of Shandong University and 90 healthy participants who received physical examinations were collected as research participants.The expression of Rpph1 was determined by qRT-PCR.siRNA-NC and siRNA-Rpph1 were transfected into esophageal cancer cell lines,and cells without transfection were designated as the blank control group.Cell survival was tested by colony formation assays,and the levels of proteins related to apoptosis and epithelial-mesenchymal transitions were determined by Western blot assays.Cell proliferation was assessed by MTT assays,cell apoptosis by flow cytometry,and cell migration by wound-healing assays.Changes in cell cycle distribution were monitored.RESULTS Rpph1 was highly expressed in esophageal carcinoma,making it a promising marker for the diagnosis of esophageal cancer.Rpph1 could also be used to distinguish different short-term responses,T stages,N stages,and clinical stages of esophageal cancer patients.The results of 3-year overall survival favored patients with lower Rpph1 expression over patients with higher Rpph1 expression(P<0.05).In vitro and in vivo experiments showed that silencing Rpph1 expression led to higher sensitivity of esophageal cancer cells to radiotherapy,stronger apoptosis in esophageal cancer cells induced by radiotherapy,higher expression of Bax and caspase-3,and lower expression of Bcl-2(Bax,caspase-3,and Bcl-2 are apoptosis-related proteins).Additionally,silencing Rpph1 attenuated radiation-induced G2/M phase arrest,and significantly inhibited the expression of proteins involved in cell proliferation,migration,and epithelial-mesenchymal transition regulation in esophageal cancer cells.CONCLUSION Rpph1 is highly expressed in esophageal cancer.Silencing Rpph1 expression can promote cell apoptosis,inhibit cell proliferation and migration,and increase radio-sensitivity.

Effects of Ni Content and Ball Milling Time on the Hydrogen Storage Thermodynamics and Kinetics Performances of La–Mg–Ni Ternary Alloys

The eifects of Ni content and ball milling time on the hydrogen storage thermodynamics and kinetics performances of asmilled La5Mg95-xNix(x=5,10,15)ternary alloys have been investigated.The evolution of microstructure and phase of experimental alloys in the absorption/desorption process has been characterized by XRD,SEM and HRTEM.The hydrogen storage kinetics and thermodynamics performances and PCI curves have been tested using the Sievert apparatus.It is found that the rising of Ni content remarkably improves the hydrogen storage kinetic performance,but reduces hydrogen storage capacity.And with the increase in milling time,hydrogen desorption activation(Ea)value decreases firstly and then increases;the minimum value is 47.6 kJ/mol,and the corresponding milling time is 10 h for La5Mg85Ni10 alloy.As for the thermodynamics properties,the hydrogenation enthalpy(△H)and hydrogenation entropy(△S)both decrease firstly and then increase with the rising of Ni content and milling time.The composite La5Mg85Ni10 alloy milled for 10 h exhibits the best thermodynamics and kinetics performances,the lowest Ea of 47.6 kJ/mol,absorption of 5.4 wt.%within 5 min and desorption of 5.2 wt.%within 3 min at 360℃and the lowest△H and△S of 72.1 kJ/mol and 123.2 J/mol/K.

Precise evaluation of h→cc and axion-like particle production

We study the decay of the SM Higgs boson to a massive charm quark pair at the next-to-next-to-leading order QCD and next-to-leading order electroweak.At the second order of QCD coupling,we consider the exact calculation of flavour-singlet contributions where the Higgs boson couples to the internal top and bottom quark.Helpful information on the running mass effects related to Yukawa coupling may be obtained by analyzing this process.High precision production for h→cc within the SM makes it possible to search for new physics that may induce relatively large interactions related to the charm quark.As an example,we evaluate the axion-like particle associate production with a charm quark pair in the Higgs decay and obtain some constraints for the corresponding parameters under some assumptions.