Exciton-Phonon Coupling of NN_3 Center in Heavily Nitrogen Doped GaP

通过光致发光谱研究了在 1 9～ 4 8K范围内掺氮浓度为 0 .1 2 %时的 Ga PN的 NN3束缚激子与声子的耦合 .直接计算了 NN3束缚激子的 L O,TO和 TA声子伴线的黄昆因子 S,除了 L O声子外 ,得到了 TO和 TA声子伴线的S因子在该温度范围内对温度的依赖关系 .计算表明 ,NN3的 L O,TO和 TA声子的 S因子均与温度无关 ,说明NN3的 L O,TO和 TA声子伴线与它们的零声子线具有相同的温度依赖关系 ,符合黄昆的多声子光跃迁理论Under heavy nitrogen doping,due to the “concentration quenching” effect,the full spectrum of the NN 3 center is revealed without the interference from the spectra of other higher energy centers.This investigation offers a direct proof for that all the phonon replicas are the phonon sidebands governed by the Huang Rhys’ multiphonon optical transition theory.国家自然科学基金 (批准号 :60 2 760 0 2 );; 厦门大学预研基金 (批准号 :Y0 70 0 5 )资助项目~

一种提高断奶雌性动物卵泡发育能力的功能糖复合物及其应用

本发明公开了一种提高断奶雌性动物卵泡发育能力的功能糖复合物。本发明复合物每1kg饲料中含有以下成分：壳寡糖1～500mg，果寡糖1～500mg，酵母多糖1～500mg。本发明是一种提高断奶动物卵泡发育能力的功能糖复合物，具有提高动物的免疫能力、抗病能力和卵泡发育能力，本复合物无毒副作用、无残留、添加量少、无污染、重复性好，对环境无不利影响

Photoluminescence Spectra of GaP_(1-x)N_x Alloys

【中文文摘】通过 Ga P1 - x Nx( x=0 .0 5 %～ 3.1%)混晶的低温光致发光 ( PL )谱 ,探讨了 N在不同组分 Ga Nx P1 - x混晶的发光特性中所起的作用 .在低组分 ( x =0 .0 5 %～ 0 .81%)下 ,Ga Nx P1 - x的 PL谱由 NNi 对及其声子伴线的发光组成 ;在高组分 ( x≥ 1.3%)下 ,NNi 对之间相互作用形成的与 N有关的杂质带导致了 Ga Nx P1 - x混晶的带隙降低 .同时 ,在 x=0 .12 %的 Ga Nx P1 - x中 ,得到了清晰的 NN3 零声子线及其声子伴线 ,从而直接证实了 NN3具有与孤立 N中心完全相似的声子伴线 . 【英文文摘】The photoluminescence spectra of GaP 1-xN x(x=0.05%～3.1%) alloys grown by MBE are studied at 17K.The evolution of the properties of the alloy with the increase of N composition is observed.The samples exhibit a series of sharp lines of NN i pairs bound excitons at low N concentration (x=0.05%～0.81%).While x increases above 1.3%,all the structures of spectra disappear and exhibit broadened emission and shift to the lower energy.The PL spectrum of GaP 1-xN x with x=0.12% exhibits clearly the phonon sideband,which shows directly NN 3 having the same phonon sideband spectrum as that of NN 1 and the isolated N center.国家自然科学基金 (批准号 :6 0 2 76 0 0 2 );; 福建省自然科学基金 (批准号 :A0 110 0 0 7)资助项

Raman Scattering of GaP_(1-x)N_x Alloys

【中文文摘】在室温下测试了 Ga P1 - x Nx(x=0 .0 5 %～ 3.1% )混晶的喇曼散射谱 .在一级喇曼散射谱中观测到了 Ga P的L O(Γ)模和强度较弱的禁戒 TO(Γ )模以及 N的局域模 (495 cm- 3) .在 N组分较高的一组样品 (x=1.3%～ 3.1% )中 ,还观察到了位于 Ga P的 L O(Γ)模和 TO(Γ)模之间的由 N导致的 L O(N)模的喇曼频移 (387cm- 1 ) ,其强度随着N浓度的增加而增强 .在二级喇曼散射谱中 ,除了观测到布里渊区中心的声子散射峰 2 L O(Γ )外 ,还观测到了布里渊区边界的声子散射峰 2 L O(L )、2 TO(X)以及 L O(L ) +TO(X) .且边界散射峰的强度比中心散射峰更强 .另外在组分 x=0 .6 %和 x=0 .81%的样品中 ,还得到了诸如来自不同 NNi 对或 N原子簇团的局域模和由 N导致的新的散射峰 【英文文摘】The Raman scattering of GaP_ 1-x N_ x alloys ( x =0 05%～3 1%) grown by MBE are studied at room temperature.In addition to the strong GaP-like LO_1 mode and weak forbidden TO_1 mode,the second order Raman scattering of the zone-edge phonon (2LO_1(L) mode and 2TO_1(X) mode) as well as the scattering of the zone-center phonon are observed.Also,the nitrogen local mode (495cm -1 ) associated with the NN center and the so-called "X" mode (387cm -1 ) of the LO phonon (manifested as a phonon sideband in the recombination of N bound excitons) are revealed in the Raman spectra of heavilyN doped samples even under nonresonant excitation. In high N samples (x > 018% ) ,multiple Raman modes are found at frequency,which is slightly lower than the localmode. These new modes are presumably associated with different NN o r N cluster configurations. Additional Raman features, activated by N doping, at 604cm - 1 and 681cm- 1, are observed in the intermediate doping region. In general, a significantly higherN concentration is needed to activate a phonon mode in Raman under non-resonant excitat ion than to observe the phonon as a phonon sideband in PL.国家自然科学基金 (批准号 :60 2 760 0 2 );; 福建省自然科学基金 (批准号 :A0 110 0 0 7)资助项

Investigation on the Emission Recombination Mechanism of GaP_(1-x)N_(x) Alloys(x=0.24% ～3.1%)

【中文文摘】利用变温光致发光(PL)谱研究了一系列GaP1-xNx混晶的发光复合机制.GaP1-xNx混晶的PL谱从低组分的NN对束缚激子及其声子伴线到高组分杂质带发光的特征,表现出明显的带隙降低的趋势.测量结果显示,在组分x≥0.24%的样品的发光谱中NN1能量之下已经开始出现几个新的束缚态,在低组分的混晶中,只存在一种激活能,仍然保持有束缚激子的特征;而在高组分样品(x≥0.81%)中存在两种激活能.高组分样品一方面仍保留有束缚激子的特征,另一方面也表现出新的发光机制. 【英文文摘】This paper presented an investigation on the emission recombination mechanism of the novel GaP_(1-x)N_(x) alloys, using the temperature-dependent photoluminescence(PL) spectra. The GaP_(1-x)N_x alloys display obvious band-gap reduction characteristic, with the PL spectra developing from nitrogen bound excitons and their phonon replicas under low x composition to impurity band emission under high x composition. The results apparently indicate the appearance of several new bound states below the NN_1 bound exciton even when the composition x is as low as 0. 24 %. In low composition alloy , there is only one activation energy , which still remains the characteristic of bound exciton state. While in high composition alloy ( x ≥0. 81 %) , there exist two kinds of activation energies. The samples with high composition , on one hand , still remain the bound exciton characteristic , on the other hand , display new recombination mechanism. Such new recombination might be related to NNN cluster or have certain interaction with the NN bound excitons.国家自然科学基金(60276002); 福建省自然科学基金(A0110007)资

Research progress of exercise training in rehabilitation of patients with chronic heart failure (慢性心力衰竭患者运动康复研究进展)

Exercise training is effective to improve the quality of life and physical function of patients with chronic heart failure. This paper reviewed the studies on exercise training in rehabilitation of patients with chronic heart failure, in order to provide reference for rehabilitation of patients with chronic heart failure. (运动训练(ET)有助于改善老年慢性心力衰竭患者的生活质量、躯体功能。本研究就国内外慢性心衰患者运动康复研究进展进行综述, 以期为临床制订相关运动护理康复方案提供参考。

全国地层多重划分对比研究－新疆维吾尔自治区岩石地层

首次采用地层多重划分理论对比研究方法，提高实用性、科学性;编制新疆岩石地层区划图和地层序列表及横剖面图;建立地层数据库，编拉汉名称对照索引、重点介绍各地层大区典型的动植物化石及编制各地层大区层型剖面分布图。：研究成果是新疆地质生产和科研遵循的岩石地层“法典”，是地矿、石油等部门基础材料，也是教学的参考材料，实用性强，现已为生产、科研教学等广泛引用。近年来在新疆进行地学研究生产的20多家单位都不同程度引用了研究成果

Study on the New Bound States in the GaP_(1-x)N_x Alloys

【中文文摘】利用变温光致发光(PL)谱及时间衰退发光谱研究了一系列CaP_(1-x)N_x混晶的光学性质。GaP_(1_x)N_x混晶的PL谱从低组分的NN对束缚激子及其声子伴线到高组分杂质带发光的特征,表现出明显的带降降低的趋势。测量结果显示,在组分x≥0.24％的样品的发光谱中NN_1能量之下已经开始出现几个新的束缚态,对其激活能的拟合及对时间衰退发光谱的分析表明,新的束缚态一方面仍保留有N束缚激子的性质,另一方面又表现出有别于NN对束缚激子的发光机制。说明新的束缚态有可能由新的N原子组成(如NNN原子)或与NN对束缚激子存在着某种相互作用。 【英文文摘】GaP_(1-x)N_x alloy is a remarkable and promising semiconductor for its giant band-gap bowing effect and its potential application in optoelectronic devices. In this article, we carried out a series of studies on the optical properties of GaP_(1-x)N_x alloys, especially focusing on the samples with composition x=0.24%, 0.6%, 0.81%, using temperature-dependent photoluminescence(PL) speetra and transient photoluminescense spectra. At 17 K PL spectra, the GaP_(1-x)N_x alloys exhibit an obvious tende...国家自然科学基金(60276002);福建省自然科学基金(A0110007