浅谈激励机制在企业管理中的应用

在现代企业中,激励问题已经成为人力资源管理中的一项重要内容。激励的科学与否,直接关系到人力资源运用的好坏。企业人才外流、积极性不能充分发挥、对企业失去信心等现象,已经成为制约企业发展的重要因素之一。有效的激励正是解决这些问题的关键。激励方法一般有以下几种:一是物质激励法,二是精神激励法,三是文化激励法,四是政治激励法。再根据实际情况加以实施,激发员工的积极性。     

LiY1-xEux（MoO4）2 as a promising red-emitting phosphor of WLEDs synthesized by sol-gel process

A series of LiY1-xEux(MoO4)2 red-emitting phosphors were synthesized by sol-gel technique. The phase impurity and spectroscopic properties were characterized by X-ray diffraction (XRD) and photo-luminescence (PL) spectra respectively. The effect of Eu3+ doping con-centration, annealing temperature and the molar ratio of citric acid to the total metal cations (C:M) on the optical properties of the red phos-phors were studied and optimized. It was found that all the samples could be excited efficiently by blue light (465 nm), which was well coin-cident with the emission of GaN based LED chips. The luminescent intensity reached maximum when annealing temperature was 750 ?C and Eu3+ doping concentration was 5% with C:M=3:1.     

Energy transfer from Tb³⁺ to Eu³⁺ in zinc lead borate glass

In order to sensitize the luminescence of Eu3+ ions in heavy metal glass,zinc lead borate glass samples containing various concentrations of Eu3+ and Tb3+ ions were prepared to study the Tb3+ to Eu3+ non-radiative energy transfer phenomena.Energy level structures of Tb3+ and Eu3+ ions were plotted to show the excitation and energy transfer routes.Efficient energy transfer from Tb3+ to Eu3+ was observed and studied qualitatively in terms of doping concentrations.The sensitization turned out to be less effective than expected.Further studies to characterize the oxidation of Tb3+ into tetravalent state and to examine the mechanism of energy transfer are proposed.     

大学物理实验操作考核的改革和实践

操作考核是大学物理实验教学的一个重要环节,但由于仪器、场地、时间、监考教师等种种原因,在现有的实验室条件下很难进行统一的标准化的实验操作考核.重庆邮电大学物理实验中心在多年的实践教学基础上,采用学生分流、时间错开和计算机辅助3种方法对操作考核进行改革和实践,取得了一定的效果.     

乙烯-醋酸乙烯酯/羟基磷灰石/聚酰胺软骨及骨一体化修复材料的制备与表征

采用共混法和相分离法制备了纳米羟基磷灰石(nHA)和聚酰胺(PA66)复合支架材料。nHA在PA66基质中分布均匀。复合支架材料孔径50～500μm,孔隙率为80.9%。将乙烯-醋酸乙烯脂(EVA)通过热注塑方法在支架材料表面涂覆形成双层结构的软骨及骨一体化修复材料,EVA层用于软骨修复,下层nHA-PA66支架进行缺损骨修复和固定。EVA和nHA-PA66的力学性能测试显示,EVA的拉伸和压缩模量分别为(0.87±0.02)MPa和(9.44±0.46)MPa,多孔支架的压缩强度和模量分别为(0.9±0.02)MPa和(15.2±0.69)MPa。摩擦测试结果表明,EVA摩擦系数为0.23。     

溶胶凝胶法制备的Y3Al5O12:Tb3+,Ce3+的光学性能及能量传递研究

用溶胶凝胶法制备了一系列不同掺杂浓度的Y3Al5O1 2(YAG):Tb3+,Ce3+荧光粉,对其物相、光学性能和能量传递进行了研究.多晶粉末X-射线衍射结果表明,所有样品均为YAG晶相,没有其它杂相.当样品在Tb3+的特征激发峰273 nm激发时,除了Tb3+的特征发射外,还观察到位于467 nm的YAG基质的电荷迁...     

溶胶凝胶法制备的Y3Al5O12：Tb^3＋,Ce^3＋的光学性能及能量传递研究

用溶胶凝胶法制备了一系列不同掺杂浓度的Y3Al5O12（YAG）：Tb3＋,Ce3＋荧光粉,对其物相、光学性能和能量传递进行了研究。多晶粉末X-射线衍射结果表明,所有样品均为YAG晶相,没有其它杂相。当样品在Tb3＋的特征激发峰273 nm激发时,除了Tb3＋的特征发射外,还观察到位于467 nm的YAG基质的电荷迁移带、位于520 nm的Ce3＋的2D3/2,5/2→2F5/2,7/2跃迁,这说明可能存在Tb3＋到Ce3＋的单向非辐射能量传递。通过监测共掺样品520 nm的发光,得到273 nm的激发峰,使得Tb3＋（5D3）到Ce3＋（2Di,i=5/2,3/2）的单向非辐射能量传递得到验证;并且随着掺杂Tb3＋浓度的增大,273 nm激发峰增强。同时,Ce3＋掺杂YAG：Tb3＋并没有使Tb3＋发光增强,相反YAG：Tb3＋,Ce3＋中Tb3＋发光与YAG：Tb3＋相比有1个数量级的减弱,造成这种情况的可能原因,一是Tb3＋到Ce3＋的单向非辐射能量传递,使得Tb3＋发光减弱;二是Ce3＋掺杂YAG：Tb3＋后基质所多吸收的能量传给了Ce3＋而非Tb3＋。     

Luminescence properties and energy transfer of host sensitized CaMoO4：Tb^3＋ green phosphors

A series of CaMoO 4 :xTb 3+(x=0.01,0.03,0.05,0.07,0.09,0.15 and 0.20) phosphors in pure phase were prepared via high temperature solid-state reaction approach.The crystal structure of the phosphors was investigated by X-ray diffraction(XRD),and the optical properties were investigated by Fourier transform infrared spectroscopy(FT-IR),ultraviolet-visible spectroscopy(UV-Vis) and photoluminescence(PL) spectroscopy.The PL spectra illustrated that these phosphors could be efficiently excited by the charge transfer band of the host and the energy transfer efficiency from the host to the doped activator reached 60% when the doping concentration of the activator Tb 3+ was 20 mol.%.The concentration quenching occurred at x=10 mol.%,from which the critical distance of activator was calculated to be about 1.14 nm.The CIE coordinates were estimated to be close to the standard green value.The host sensitized samples had potential application as green phosphors.     

Energy transfer from Ce~(3+) to Tb~(3+) and Eu~(3+) in zinc phosphate glasses

Ce3+,Eu3+ and Tb3+ singly doped and Ce3+/Eu3+ and Ce3+/Tb3+ co-doped zinc phosphate glasses were prepared by sintering P2O5,ZnO,Ce2(C2O4)3·10H2O and Eu2O3/Tb4O7 mixtures at 1200 °C in the air for 2 h and then annealing at 450 °C for 10 h.The obtained glasses were homogeneous and transparent.The glasses without Ce3+ were colorless and those with Ce3+ showed slightly yellow.The singly doped glasses showed strong emissions and excitations from doped trivalent rare earth ions.Strong energy transfer from Ce3+ to Tb3+ was observed for Ce3+/Tb3+ coped samples.There were also some very weak evidences for the energy transfer from Ce3+ to Eu3+.