用氢氧化铵及氯化铵分离铜于鐵

用氫氧化銨及氯化銨以分離銅與鐵,結果很好。氫氧化鐵中所留銅量,在實用分析上,已少至毋須考慮。用此法自多量鐵中分離少量銅份,可直接用此色法测定。五價砷與銻存在時,如不超過10毫克,或磷酸根不超過50毫克時,不影響銅與鐵的分離。鋁對分離更無影響。     

三水合稀土氯化物RECl3·3H2O的热化学研究

本文报道了一套化学反应绝热式热量计的设计和建立,用(HOCH_2)_3CNH_2与0.1mol·dm~3HCl的反应焓检验标定了热量计装置,测得ΔH_(208.15)=-245.41J·g~(-1),sdm=±0.24,与IUPAC的推荐值-245.76±0.26J·g~(-1)十分吻合,证明热量计和操作手续是可靠的。用这样的热量计测定了十一种三水合稀土氯化物RECl_3·3H_2O(RE=La,Ce,Nd,Sm,Eu,Gd,Tb,Dy,Er,Yb,Y)298.15K时在水中的积分溶解热(终浓度-0.01541mol·kg~(-1))。计算了这些水合物的标准生成焓和脱水焓。     

四元体系KCl-K2SO4-CO(NH2)2-H2O有25℃时的等温溶度研究

测定了四元体系KCl－K₂SO₄－CO(NH₂)₂－H₂O及边界三元体系K₂SO－CO(NH₂)₂-H₂O在25℃时的溶度及饱和溶液密度值和折光率,绘制了相应的溶度图及相应的组成-性质图.测定并绘制了该四元体系K₂SO₄单饱区的溶度面、折光率面和密度面图.两个体系的溶度图均属于低共饱型,平衡固相为组份化合物.     

三元体系Ln(ClO~4)~3-ACAP-H~2O(Ln=La,Sm,Yb)的相平衡研究(30℃)

测定了三元体系Ln(ClO~4)~3-ACAP-H~2O(Ln=La,Sm,Yb, ACAP=4-乙酰安替比林)在30℃时的溶解度及饱和溶液的折光率,绘制了相应的溶度图和饱和溶液的折光率-组成图.体系的溶度曲线和折光率曲线均由三支组成,分别与ACAP,Ln(ACAP)~3(ClO~4)~3·nH~2O(Ln=La,n=4,Sm,2,Yb,2)和Ln(ClO~4)~3·nH~2O(Ln=La,n=8,Sm,9,Yb,8)相对应.从溶度图上发现了三个未见文献报道的三元化合物, 它们均为固液异组成溶解的化合物.通过化学分析,元素分析,TG-DTG,IR,UV和X射线粉末衍射进行了表征.初步探讨了影响安替比林4位酰代衍生物β-二酮配体配位能力的因素     

用DSC法及DTA法测定镧丶镨丶钕丶水合氯化物脱水过程中各阶段的热效应

Unider the condition that each of the corresponding peaks in DTA and DSC curves are completely separated, the ΔH of each stage of dehydration process of LaCl3.7H2O, PrCl3.6H2O, NdCl3.6H2O SmCl3.6H2O have been determined more accurately. Some peaks are separated for the first time and some data given have not yet been reported in literature.     

Yb(ClO4)3-BAPHDCA-H2O的相平衡研究 及其三元化合物的制备

用相平衡法研究了三元体系Yb(ClO     

一种新型光子晶体波导定向耦合型超微偏振光分束器

将两个二维空气孔光子晶体波导平行放置,两波导之间由三排空气孔相隔,构成一个定向耦合器.数值分析了TE(磁场平行于空气孔)和TM(电场平行于空气孔)偏振态光波在该定向耦合器中的传播行为.结果表明,减小耦合区两波导间的一排介质柱的半径,TE模的耦合长度减小,而TM模的耦合长度不变.基于此结构,设计了超微偏振光分束器,整个器件的尺寸为10.1μm,与已报道的24.2μm的结果相比,该器件具有更小的器件尺寸和更高的输出效率.     

Single-mode lasing in a coupled twin circular-side-octagon microcavity

We demonstrate the curvature of coupled twin circular-side-octagon microcavity (TCOM) lasers as the degree of freedom to realize manipulation of mode quality ($Q$) factor and lasing characteristics. Numerical simulation results indicate that mode $Q$ factors varying from 10$^{4 }$ to 10$^{8}$, wavelength intervals of different transverse modes, and mode numbers for four-bounce modes can be manipulated for five different deformations. Global mode distributes throughout coupled microcavity with mode $Q$ factor around the order of 10$^{4 }$ or 10$^{5}$. Four-bounce modes lase with injection currents applied single microcavity. By pumping both microcavities simultaneously, single-mode lasing for global modes with side mode suppression ratios (SMSRs) of 30, 32, 32, 31, and 36 dB is achieved at the deformation of 0, 0.5, 1, 1.5, and 2 with four-bounce modes suppressed, respectively. Moreover, the linewidths less than 11 MHz for the single mode are obtained with the deformation of 2. The results show that the lasing modes can be efficiently manipulated considering variable curvature for TCOM lasers, which can promote practical applications of microcavity lasers.     

双折射对基于半导体光放大器的干涉型器件性能影响的模拟分析研究

分析了半导体光放大器中双折射对基于半导体光放大器的干涉型器件性能的影响，对基于半导体光放大器的马赫—曾德尔型波长转换器的理论计算表明，当半导体光放大器有双折射存在时，消光比不仅要比无双折射时的要低，而且还随着探测光的偏振态而改变，变化幅度可大于10dB。提出了减小双折射对干涉型器件影响的方案，并且分析了实现对增益和对相位变化同时具有偏振不灵敏的半导体光放大器的可能性。     

Enhancement of the Spectral Width of High-Power 1.5μm Integrated Superluminescent Light Source by Quantum Well Intermixing Process

A novel type of integrated InGaAsP superluminescent light source was fabricated based on the tilted ridgewaveguide structure with selective-area quantum well (QW) intermixing. The bandgap structure along the length of the device was modified by impurity free vacancy diffusion QW interminxing. The spectral width was broadened from the 16nm of the normal devices tovacancy diffusion QW intermixing. The spectral width was broadened from the 16nm of the normal devices to 37nm of the QW intermixing enhanced devices at the sameoutput power level. High superluminescent power (210 mW) was obtained under pulsed conditions with a spectralwidth of 37nm.