Evolution of N = 20, 28, 50 shell closures in the 20 ≤ Z ≤ 30 region in deformed relativistic Hartree-Bogoliubov theory in continuum

Magicity,or shell closure,plays an important role in our understanding of complex nuclear phenomena.In this work,we employ one of the state-of-the-art density functional theories,the deformed relativistic HartreeBogoliubov theory in continuum(DRHBc) with the density functional PC-PK1,to investigate the evolution of the N=20,28,50 shell closures in the 20 ≤Z ≤30 region.We show how these three conventional shell closures evolve from the proton drip line to the neutron drip line by studying the cha...     

基于双十字架型宽带低耗小单元左手材料的设计与实验验证

提出了一种利用电谐振器与磁谐振器集成于一体的单面左手介质结构设计方案, 该方案采用两个十字架型金属结构镜像并列放置在介质基板的同一侧形成一个左手单元, 并将其排列成周期结构. 软件仿真和优化提取了一系列有效电磁参数, 结果表明, 该结构在9.4–16 GHz的频率范围内等效介电常数和等效磁导率同时为负, 其相对带宽达到了52%, 并且单元电长度和损耗都小于同类型的结构. 对该结构进行了加工、制作并通过波导法测试再次证明了其优良左手特性的存在性. 为左手材料的广泛应用打下了基础.     

THE EVOLUTION OF MODERN OYSTER BIOHERMS AND THE ECOLOGICAL CHARACTER AND THE PALEOEN-VIRONMENTAL SIGNIFICANCE

In this paper, the morphology, sedimentary structure, bioherm--building mollusk assem-blages and their growing and piling-up models of modern oyster bioherms in the estuariesof the Zimaigou and Xiaoqing Rivers are described and expounded, the environmentalconditions for the development of oyster bioherms, such as the dynamical geomorphicbackground, water depth, hydrodynamic factors and ecological conditions in the estuaries,are analyzed, the relationship of the successively seaward migrating of oyster biohermswith average annual sea-level changes and the erosion--accretion processes in the estuariesare probed and explained, and the geological significance of oyster bioherms in the studyof Quaternary marine environmental evolution is presented.     

材料试验机测量位移功能扩展

介绍了自行设计的测量“弯曲－压缩”位移量的仪器与材料试验机的联要应用，该系统可测得精确的位移量，并可自动绘图，开发了原仪器设备的功能，提高了它的利用率和效率。     

疏水缔合水溶性聚合物P(AM/NaAA/DiAC16)的合成与性能

以双烯丙基胺和1-溴代十六烷为原料合成了疏水单体N,N-双烯丙基十六胺,采取前加碱二元胶束共聚-后水解法合成了三元疏水缔合水溶性聚合物聚(丙烯酰胺/丙烯酸钠/N,N-双烯丙基十六胺)[P(AM/NaAA/DiAC16)],用FTIR、1H-NMR进行了结构表征;以芘为荧光探针,利用稳态荧光光谱法、粘度法研究了P(AM/NaAA/DiAC16)在水溶液的缔合行为.当x(DiAC16)=0.10～0.40 %时,在30℃、1mol·L-1NaCl溶液中,其Huggins常数KH小于0.80(144～0.294),表明稀溶液中缔合作用较弱.随聚合物浓度、疏水单体用量的增加,P(AM/NaAA/DiAC16)在二次蒸馏水中、1.000 mol·L-1 NaCl水溶液中,I1/I3值减少;在矿化度为19 334 μg/g盐水溶液中,水溶液的表观粘度增加、临界缔合浓度降低.结果表明,P(AM/NaAA/DiAC16)缔合行为取决于聚合物浓度、疏水单体用量及介质的极性.     

含硫磷酸钙纳米颗粒的制备及对铅离子的高效选择性去除

用一种简易共沉淀法制备了非晶含硫磷酸钙（SCP）材料,实现硫原子原位引入磷酸钙纳米颗粒中,并研究了其对Pb（II）的吸附特性和机理。与羟基磷灰石相比,SCP对Pb（II）的去除性能显著增强,在10 min内能快速将20 ppm的Pb（II）溶液降低至饮用水标准下。由Langmuir吸附等温线模型计算可知,SCP对Pb（II）的最大饱和吸附量高达1720.57 mg/g,这个数值远远超过以往所报道的绝大部分吸附剂材料。在竞争离子Ni（II）,Co（II）,Zn（II）和Cd（II）共存的条件下,SCP还表现出对Pb（II）的选择性去除。研究表明,SCP对Pb（II）超高的去除效率和优异的亲和力归因于其可通过溶解沉淀和离子交换反应在其表面形成棒状的羟基磷酸铅晶体,以及形成沉淀物硫化铅。SCP以其对Pb（II）快速、高效和优异选择性成为在实际铅污染治理中的理想材料.     

Ag@SiO2纳米核壳结构对铒碲发光玻璃的发光增强机制

本研究首次把预先制备好的Ag@SiO₂纳米核壳结构成功地引进到碲化物发光玻璃70TeO₂-25ZnO-5La₂O₃-0.5Er₂O₃体内,发现(A)Ag(1.6×10^?6mol/L)@SiO₂(40 nm)@Er³⁺(0.5%):铒碲发光玻璃相对于样品(B)Er³⁺(0.5%):铒碲发光玻璃的可见光与红外光的激发光谱强度的最大增强依次为149.0%与161.5%,可见光与红外光的发光光谱强度则依次最大增强了155.2%与151.6%,同时还发现样品(A)相对于样品(B)的寿命显著变长。由于Ag@SiO₂的表面等离子体吸收峰恰好位于546.0 nm,它与铒离子的发光峰546.0 nm完全共振,因此,Ag@SiO₂对铒碲发光玻璃的发光共振增强作用显著。由于银的纳米核壳结构与玻璃的制作具有分步实现的优点,它既能成功控制Ag@SiO₂的尺寸,而且在Ag@SiO₂@Er:铒碲发光玻璃的制作过程中还具有可操作性强的优点,同时价格也更加便宜。在保证银不被氧化的前提下,还可控制稀土离子发光中心与银的表面等离子体之间的距离,因此能够成功地减少背向能量反传递。上述优点促成了Ag@SiO₂纳米核壳结构表面等离子体有效加强了Ag@SiO₂@Er³⁺:铒碲发光玻璃的常规光致发光强度。     

Interference Phase of Neutrino Oscillation in Schwarzschild-de Sitter Space-Time

We study the mass neutrino interference phase in Schwarzschild-de Sitter space time along the null trajectory and the geodesic line and obtain the effects of cosmological constant A on the neutrino oscillation. Firstly, in the high energy limit, we find that the phase along the geodesic keeps the double of that along the null. Secondly, we calculate the phase on the condition that the cosmological constant, A, is a small quantity. The correction of the phase due to A is given. Finally, we calculate the proper oscillation length in Schwarzschild-de Sitter space-time, which increases because of the existence of A, compared with the result in Schwarzschild space-time. All of our results can be reduced to those in Schwarzschild space-time as A approaches to zero.     

P(AMPS-co-HEMA)凝胶的合成与吸银性能研究

以2-丙烯酰胺基-2-甲基丙磺酸(AMPS)和甲基丙烯酸羟乙酯(HEMA)为单体,N,N′-亚甲基双丙烯酰胺(MBA)为交联剂,过硫酸钾(KPS)为引发剂,采用自由基水溶液聚合法制备P(AMPS-co-HEMA)共聚凝胶,通过傅里叶红外光谱(FT-IR)对材料结构进行了表征.研究单体配比、交联剂的用量、引发剂的用量对共聚凝胶吸水性能的影响,并在此基础上对凝胶的溶胀、吸银及消溶胀性能进行研究.结果表明,当单体摩尔比n(AMPS)∶n(HEMA)=2∶1,交联剂用量ω(MBA)=0.6％,引发剂用量ω(KPS)=0.8％,所制得的凝胶吸水性能最好;凝胶在蒸馏水中的溶胀过程属于松弛平衡扩散;凝胶在AgNO3溶液中60min左右达到消溶胀平衡,且当AgNO3溶液的浓度为0.05mol/L时,银离子吸附量最大,为0.04g/g,消溶胀速率最快.