Improvement of radiative recombination rate in deep ultraviolet laser diodes with step-like quantum barrier and aluminum-content graded electron blocking layer

The design of the active region structures,including the modifications of structures of the quantum barrier(QB)and electron blocking layer(EBL),in the deep ultraviolet(DUV)Al Ga N laser diode(LD)is investigated numerically with the Crosslight software.The analyses focus on electron and hole injection efficiency,electron leakage,hole diffusion,and radiative recombination rate.Compared with the reference QB structure,the step-like QB structure provides high radiative recombination and maximum output power.Subsequently,a comparative study is conducted on the performance characteristics with four different EBLs.For the EBL with different Al mole fraction layers,the higher Al-content Al Ga N EBL layer is located closely to the active region,leading the electron current leakage to lower,the carrier injection efficiency to increase,and the radiative recombination rate to improve.

Decrease of back recombination rate in CdS quantum dots sensitized solar cells using reduced graphene oxide

The photovoltaic performance of CdS quantum dots sensitized solar cells （QDSSCs） using the 0.2 wt% of reduced graphene oxide and TiO2 nanoparticles （RGO＋TiO2 nanocomposite） photoanode is investigated. CdS QDs are adsorbed onto RGO＋TiO2 nanocomposite films by the successive ionic layer adsorption and reaction （SILAR） technique for several cycles. The current density-voltage （J-V） characteristic curves of the assembled QDSSCs are measured at AM1.5 simulated sunlight. The optimal photovoltaic performance for CdS QDSSC was achieved for six SILAR cycles. Solar cells based on the RGO＋TiO2 nanocomposite photoanode achieve a 33% increase in conversion efficiency （η） compared with those based on plain TiO2 nanoparticle （NP） photoanodes. The electron back recombination rates decrease significantly for CdS QDSSCs based on RGO＋TiO2 nanocomposite photoanodes. The lifetime constant （τ） for CdS QDSSC based on the RGO＋TiO2 nanocomposite photoanode is at least one order of magnitude larger than that based on the bare TiO2NPs photoanode.

Calculation of Photo-Ionisation Cross Sections and Radiative Recombination Rate Coefficients for CO and CO^+ Molecules

A method based upon the weighted total cross section （WTCS） theory is proposed to calculate the photo-ionisation cross sections and the radiative recombination rate coefficients between the fundamental level of CO and the main electronic states of its corresponding ion. Total photo-ionisation cross sections and radiative recombination rate coefficients are determined from the calculation of elementary vibrational photo-ionisation cross sections. Transitions be- tween CO＋（X, A and B） and CO（X） are considered. Total photo-ionisation cross sections and recombination coefficients are computed in the temperature interval 500-15000 K.

Inhibiting radiative recombination rate to enhance quantum yields in a quantum photocell

Inhibiting the radiative radiation is an efficient approach to enhance quantum yields in a solar sell.This work carries out the inhibition of radiative recombination rate(RRR)in a quantum photocell with two coupled donors.We perform explicit calculations of the transition rates,energy gaps and the absorbed solar wavelength-dependent RRR,and find that two different regimes play the crucial roles in inhibiting RRR.One is the quantum coherence generated from two different transition channels,the other includes the absorbed photon wavelength and gaps between the donor and acceptor in this proposed photocell model.The results imply that there may be some efficient ways to enhance the photoelectron conversion compared to the classic solar cell.

Influences of Injection Barrier and Mobility on Recombination Rate and Zone in OLEDs

The luminous efficiency of organic light-emitting devices depends on the recombination probability of electrons injected at the cathode and holes at the anode. A theoretical model to calculate the distribution of current densities and the recombination rate in organic single layer devices is presented taking into account the charge injection process at each electrode, charge transport and recombination in organic layer. The calculated results indicate that efficient single-layer devices are possible by adjusting the barrier heights at two electrodes and the carrier mobilities. Lowering the barrier heights can improve the electroluminescent(EL) efficiency pronouncedly in many cases, and efficient devices are still possible using an ohmic contact to inject the low mobility carrier, and a contact limited contact to inject the high mobility carrier. All in all, high EL efficiency needs to consider sufficient recombination, enough injected carriers and well transport.

Surface Recombination Concept as Applied to Determinate Silicon Solar Cell Base Optimum Thickness with Doping Level Effect

New expressions of back surface recombination of excess minority carriers in the base of silicon solar are expressed dependent on both, the thickness and the diffusion coefficient which is in relationship with the doping rate. The optimum thickness thus obtained from the base of the solar cell allows the saving of the amount of material needed in its manufacture without reducing its efficiency.

Dielectronic recombination of Co-like tantalum

Ab initio calculation of the total dielectronic recombination （DR） rate coefficient from the ground state of Co-like tantalum is performed using the relativistic distorted-wave approximation with configuration interaction. The contributions to the total DR rate coefficients are explicitly calculated from the complexes of Ni-like tantalum：3s^23p^63d3/2^33d5/2^6n′l′,3s^23p^53d^10n′l′,3s3p^63d^10n′l′,3s^23p^63d^84ln′l′,3s^23p^53d^94ln′l′ and 3s3p^63d^94ln′l′ with n′≤25, and 3s^23p^63d^85ln′l′ with n′≤9.The l′and n′ dependences of partial DR rate coefficients are investigated. The contributions from higher n^complexes are evaluated by a level-by-level extrapolation method. The total DR rate coefficients mainly come from the complex series 3s^23p^63d^84ln′l′,3s^23p^53d^94ln′l′and are fitted to an empirical formula with high accuracy. Comparison of the present results with those of other works shows that the previously published data underestimate significantly the DR rates of Co-like tantalum.

Dielectronic Recombination of Br-Like Tungsten Ions

Accurate data for dielectronic recombination of tungsten ions are essential in the modeling of tungsten impurity transport and radiative power loss in International Thermonuclear Experimental Reactor （ITER）. Theoretical calculations have been made for dielectronic recombi- nation （DR） rate coefficients of Br-like tungsten ions using a flexible relativistic atomic code （FAC） from i eV to 50 keV. Level-by-level calculations are carried out for evaluating the contributions to DR through all the relevant Kr-like tungsten ions autoionizing inner-shell excited configuration complexes： （3s23p63d10）-14s24p5nlntl＇ （n = 4-5, n＇ = 4-100,l＇ = 0-8）, （4s24pS）-lnln＇l＇ （n = 4-6, n＇ = 4-100, l＇ = 0-12）. Comparison of the rate coefficients for 3s, 3p, 3d, 4s and 4p subshell excitations shows that the 4p subshell excitation dominates over the whole temperature region, 4s subshell excitation at low temperature and 3p, 3d subshell excitations at high temperature can not be neglected. In order to facilitate simple applications, the total DR rate coefficient, △n = 0,1 and 2 core excitations DR rate coefficients are fitted to an empirical formula.

重组人干扰素α-2b乳膏治疗小儿传染性软疣的临床效果

目的 探讨重组人干扰素α-2b乳膏治疗小儿传染性软疣的临床效果。方法 选取2022年3月至2023年3月在滨州市中心医院皮肤科就诊的84例传染性软疣患儿作为研究对象,按照奇偶分组法分为参照组(42例)与试验组(42例)。参照组采用夹疣治疗,试验组采用重组人干扰素α-2b乳膏治疗。比较两组治疗效果及复发情况。结果 试验组总有效率高于参照组,复发率低于参照组(P <0.05)。结论 重组人干扰素α-2b乳膏治疗小儿传染性软疣的临床效果较好,复发率较低,值得临床推广应用。

重组人尿激酶原联合硝普钠替罗非班冠状动脉内注射对高血栓负荷STEMI患者行PCI疗效的影响

目的 分析重组人尿激酶原联合硝普钠替罗非班冠状动脉内注射对高血栓负荷急性ST段抬高型心肌梗死(ST-segment Elevation Myocardial Infarction,STEMI)患者行经皮冠状动脉介入治疗(Percutaneous Coronary Intervention,PCI)疗效的影响。方法 选取2022年1月—2023年6月连云港市中医院收治的82例需行PCI高血栓负荷STEMI患者为研究对象,按照随机数表法分为研究组和对照组,各41例。对照组应用硝普钠、替罗非班冠状动脉内注射,研究组在对照组基础上给予重组人尿激酶原治疗,对比两组心功能指标、出血事件发生情况、术后并发症发生情况。结果 术后各时间点,研究组左心室舒张末期内径低于对照组,左心室射血分数高于对照组,差异有统计学意义(P均<0.05)。研究组并发症发生率(9.76%)低于对照组(26.83%),差异有统计学意义(χ^(2)=3.998,P<0.05)。两组出血率比较,差异无统计学意义(P>0.05)。结论 重组人尿激酶原联合硝普钠、替罗非班冠状动脉内注射,能够提高高血栓负荷STEMI患者行PCI过程中的心功能,降低术后并发症,且不会增加出血风险。

戈舍瑞林联合rhGH对中枢性性早熟患儿生长速度、子宫与卵巢容积及骨代谢的影响

目的探讨戈舍瑞林联合重组人生长激素(rhGH)对中枢性性早熟患儿生长速度、子宫与卵巢容积及骨代谢的影响。方法选取遵化市人民医院于2020年5月至2022年4月收治的84例诊断为中枢性性早熟的女童作为研究对象,采用随机数字表法分为观察组(n=42)和对照组(n=42)。对照组采用皮下注射戈舍瑞林治疗,观察组在对照组基础上加用rhGH治疗。计算两组患儿治疗前后生长速度、测定骨龄及预测成年身高;B超下观察并计算两组患儿子宫和卵巢容积;采用电化学发光免疫分析法检测Ⅰ型原胶原氨基N端前肽(PINP)、Ⅰ型胶原羧基端肽交联(β-CTX)、骨钙素N端中分子片段(N-MID)水平;采用放射免疫法检测卵泡刺激素(FSH)、雌二醇(E_(2))和黄体生成素(LH)水平。结果治疗前两组患儿身高、预测成年身高、生长速度、骨龄、子宫和卵巢容积、PINP、β-CTX、N-MID、E_(2)、FSH和LH水平比较,差异无统计学意义(P>0.05)。治疗后两组患儿身高、预测成年身高及生长速度较治疗前增加,且观察组治疗后身高、预测成年身高、生长速度高于对照组(t=2.812、2.159、2.049,P<0.05);治疗后两组患儿子宫和卵巢容积较治疗前缩小,且观察组小于对照组(t=5.014、3.492,P<0.05);治疗后两组患儿PINP、N-MID、E_(2)、FSH和LH水平较治疗前下降,且观察组低于对照组(t=3.503、2.230、3.694、3.158、2.458,P<0.05)。观察组和对照组不良反应发生率比较,差异无统计学意义(P>0.05)。结论戈舍瑞林联合rhGH能够减缓中枢性性早熟患儿第二性征发育,调节骨代谢和性激素水平。

重组人生长激素治疗特发性矮小症的效果分析

目的:探讨重组人生长激素在特发性矮小症患儿中的应用效果。方法:选取2020年5月—2022年3月麻城市人民医院收治的特发性矮小症患儿68例作为研究对象,根据随机数字表法分为对照组与观察组,各34例。对照组给予常规营养治疗,观察组在对照组基础上给予重组人生长激素治疗。比较两组生长速度、体质量、血清胰岛素样生长因子-1(IGF-1)水平、胰岛素样生长因子结合蛋白-3(IGFBP-3)水平、维生素D水平及并发症发生情况。结果:治疗前,两组生长速度、体质量比较,差异无统计学意义(P>0.05);治疗后,两组生长速度、体质量高于治疗前,且观察组高于对照组,差异有统计学意义(P<0.001)。治疗前,两组IGF-1、IGFBP-3、维生素D水平比较,差异无统计学意义(P>0.05);治疗后,两组IGF-1、IGFBP-3、维生素D水平均高于治疗前,且观察组高于对照组,差异有统计学意义(P<0.001)。两组并发症总发生率比较,差异无统计学意义(P>0.05)。结论:重组人生长激素治疗特发性矮小症的效果较好,能够促进患儿生长发育,提高生长相关因子水平,且安全性较高。

铁酸铋基异质结光催化剂降解有机污染物的研究进展

铁酸铋(BiFeO_(3))作为一种典型的窄带隙铁电半导体,其自身的退极化场可以抑制光生电子空穴对的复合,已被广泛应用于光催化领域。通过构建异质结,借助界面电场对电子-空穴对进行有效分离是一种提升光催化剂降解性能的重要策略。综述了BiFeO_(3)基Ⅱ型异质结、Z型异质结、肖特基结和S型异质结光催化剂的构建原理,重点介绍了在BiFeO_(3)基异质结光催化剂在降解有机污染物方面的应用及其光催化反应机制,最后对BiFeO_(3)基异质结光催化剂研究的不足和未来的发展方向进行了展望。

四层插入层量子垒AlGaN深紫外LED研究

本文通过对不同量子垒结构的AlGaN深紫外LED进行数值研究,对比分析了量子垒结构与其发光性能之间的关联.结果表明,相较于传统量子垒结构的样品A,四层插入层量子垒结构的样品B和样品C,内量子效率峰值分别提升了27.04%和18.8%,光输出功率在200 mA下分别提升了31.04%和21.62%.这主要是因为四层插入层量子垒结构可有效增加有源区内量子垒的能带势垒高度,提升量子阱对载流子的束缚能力.

口服海曲泊帕与皮下注射重组人血小板生成素用于单倍体造血干细胞移植

背景:异基因造血干细胞移植是治疗恶性血液病的重要手段,术后血小板植入延迟是常见并发症,严重影响患者生存质量,然而,目前并无标准方案来提高血小板植入率和预防血小板植入延迟。目的:对比分析口服海曲泊帕与皮下注射重组人血小板生成素促进恶性血液病患者单倍体造血干细胞移植后血小板植入的安全性及有效性。方法:回顾性分析2016年1月至2022年10月进行单倍体造血干细胞移植的163例恶性血液病患者的临床资料。+2 d开始皮下注射重组人血小板生成素的患者共72例,归为重组人血小板生成素组;+2 d开始口服海曲泊帕的患者共27例,归为海曲泊帕组;未应用海曲泊帕及重组人血小板生成素的64例患者归为空白对照组。对3组植入情况、100 d内Ⅱ-Ⅳ度急性移植物抗宿主病发生率、1年生存率、1年复发率及安全性进行分析。结果与结论:(1)中位随访时间52(12-87)个月,空白对照组、重组人血小板生成素组、海曲泊帕组患者中性粒细胞植入时间分别为(12.95±3.88)d,(14.04±3.71)d,(13.89±2.74)d,差异无显著性意义(P=0.352);血小板植入时间分别为(15.16±6.27)d,(17.67±6.52)d,(17.00±4.75)d,差异无显著性意义(P=0.287);(2)空白对照组、重组人血小板生成素组、海曲泊帕组第60天血小板完全植入率分别为64.06%,90.28%,92.59%,差异有显著性意义(P<0.001);亚组分析显示,空白对照组与重组人血小板生成素组比差异有显著性意义(P<0.001),空白对照组与海曲泊帕组比差异有显著性意义(P=0.004),重组人血小板生成素组与海曲泊帕组比差异无显著性意义(P=0.535);(3)空白对照组、重组人血小板生成素组、海曲泊帕组100 dⅡ-Ⅳ度急性移植物抗宿主病发生率分别为25.00%,30.56%,25.93%,差异无显著性意义(P=0.752);(4)巨细胞病毒血症、巨细胞病毒肺炎、肝功能损伤发生率在3组间无显著性差异(P>0.05);(5)随访期内,3组患者均未发生血栓事件;(6)结果表明,重组人血小板生成素、海曲泊帕均可提高恶性血液病患者单倍体造血干细胞移植后血小板的植入率,疗效相当且安全性良好。

中药浸浴联合重组表皮细胞在压疮患者中的应用效果

目的探究中药浸浴联合重组表皮细胞在压疮患者中的应用效果。方法选取2022年1月至2023年6月贵溪市中医院收治的60例压疮患者作为研究对象,采用随机数字表法将其分为对照组与观察组,每组各30例。对照组采用重组表皮细胞生长因子方法,观察组在对照组基础上使用中药浸浴,分析两组干预后的创面愈合有效率、炎症因子水平、症状缓解时间、转化生长因子(TGF-β1)、血管内皮生长因子(VEGF)表达水平以及不良反应发生率。结果治疗前两组的TGF-β1、VEGF表达水平、炎症因子水平比较,差异无统计学意义(P>0.05)。观察组治疗后TGF-β1、VEGF表达水平以及炎症因子水平均低于对照组,差异有统计学意义(P<0.05)。观察组症状缓解时间、不良反应发生率低于对照组,差异有统计学意义(P<0.05)。观察组创面愈合总有效率高于对照组,差异有统计学意义(P<0.05)。结论在临床上对压疮创面修复中采用重组表皮细胞生长因子联合中药浸浴效果更好,患者创面愈合有效率提高,症状缓解时间缩短,不良反应发生率少,安全性高且效果显著,临床应用价值高。

重组人干扰素α2b阴道泡腾片治疗宫颈高危型HPV感染的效果

目的:探讨重组人干扰素α2b阴道泡腾片治疗宫颈高危型人乳头瘤病毒(HPV)感染的效果。方法:选取2021年2月—2022年2月无锡市康复医院收治的124例宫颈高危型HPV感染患者作为研究对象,按随机数表法将124例患者分为观察组(n=62)和对照组(n=62)。对照组采用膦甲酸钠氯化钠注射液治疗,观察组采用重组人干扰素α2b阴道泡腾片治疗。比较两组HPV转阴率、临床效果、血清炎症因子及T淋巴细胞水平。结果:治疗后,观察组HPV转阴率为90.32%,高于对照组的72.58%,差异有统计学意义(χ^(2)=5.024,P=0.025);观察组总有效率为87.10%,高于对照组的69.35%,差异有统计学意义(χ^(2)=6.508,P=0.011);治疗后,两组白细胞介素-1(IL-1)、肿瘤坏死因子-α(TNF-α)较治疗前降低,且观察组低于对照组,差异有统计学意义(P<0.05)。治疗后,两组T淋巴细胞水平较治疗前改善,且观察组CD8^(+)水平低于对照组,而CD4^(+)、CD4^(+)/CD8^(+)及CD3^(+)水平高于对照组,差异有统计学意义(P<0.05)。结论:重组人干扰素α2b阴道泡腾片能提高宫颈高危型HPV感染患者细胞免疫能力,降低血清炎症因子水平,进而提高HPV转阴率,缓解临床症状。

Pharmacokinetic Study of a Novel Recombinant Human Granulocyte Colony-stimulating Factor in Rats

Objective To study the pharmacokinetics of a novel recombinant human granulocyte colonystimulating factor (rhG-CSFa) in rats and to determine the proteolytic rates of rhG-CSFa in the whole blood and serum of rats in vitro. Methods The pharmacokinetics of rhG-CSFa and conventional (wild type,WT) granulocyte colonystimulating factor (G-CSF) were investigated in Sprague-Dawley rats which received either intravenous or subcutaneous injection of rhG-CSFa or WT G-CSF at three different doses (20,50,or 100 μg/kg). The blood samples of rats were collected at multiple time points (from 0.08 to 12 h) and the concentrations of rhG-CSFa and WT G-CSF in serum were determined with a sandwich enzyme-linked immunosorbent assay (ELISA). For the study of proteolytic rates in vitro,the concentrations of rhG-CSFa or WT G-CSF were determined at 3-minute intervals after addition of the respective drug to rat’s whole blood or serum. Results Pharmacokinetic analysis of serum rhG-CSFa or WT G-CSF levels indicated that,at each dose tested,for either route of drug administration,the area under concentration-time curve values and the maximum serum concentration of rhG-CSFa were higher than those of WT G-CSF,and the serum half life of rhG-CSFa was longer than that of WT G-CSF. Subsequent in vitro whole blood and serum stability study showed that the rates of drug degradation in WT G-CSF were 1.8 folds and 1.5 folds higher than those in rhG-CSFa,respectively. Conclusion rhG-CSFa has better serum and whole blood stability in vitro and higher bioavailability in vivo as compared to WT G-CSF.

Resonance Excitation Rate Coefficient of Ni-Like Tantalum

The ab initio calculations of electron-impact resonant excitation rate coefficients from the ground level to 54 fine-structure levels of 3d94l （1 = s, p, d, f） configurations of Ni-like tantalum ion are performed by using a fully relativistic distorted-wave approximation. The configuration-interaction effects are taken into account. The decays to autoionizing levels possibly followed by autoionization cascades are also included in the calculation. The contributions from doubly-excited intermediate states of Cu-like 31^17n′l′n′l″ （n′ = 4, 5; n″ = 5 - 15） are calculated explicitly, and the contributions from high Rydberg states （n″〉 15） are taken into account by using n-3 scaling law. The present results should be more accurate than the existent calculations.

rhBNP联合地尔硫卓治疗对急性心肌梗死合并心力衰竭患者心率变异性及住院期间MACE发生率的影响

目的探究重组人B型钠尿肽(rhBNP)联合地尔硫卓对急性心肌梗死合并心力衰竭患者心率变异性(HRV)及住院期间不良心血管事件(MACE)发生率的影响。方法将182例急性心肌梗死合并心力衰竭患者随机分为对照组和观察组,对照组给予常规治疗,观察组在对照组基础上给予rhBNP联合地尔硫卓治疗;观察两组临床疗效,比较治疗前后心功能指标、HRV指标及相关实验室指标的变化,并统计患者住院期间MACE发生情况。结果观察组总治疗有效率为89.01%,高于对照组(P<0.05)。治疗后,两组LVEF均高于同组治疗前,LVEDV和LVESV均低于同组治疗前,且观察组LVEF高于对照组,LVEDV和LVESV低于对照组(P<0.05)。治疗后,对照组SDNN、SDANN、RMSSD及PNN50较治疗前均有所提高,仅SDNN和PNN50治疗前后比较有统计学意义(P<0.05);观察组治疗后上述指标均明显高于治疗前,且高于对照组(P<0.05)。治疗后,两组NT-proBNP、hs-CRP及Cr低于同组治疗前,且观察组上述指标低于对照组(P<0.05)。治疗期间,两组患者均未出现明显不良反应;住院期间,观察组MACE发生率为6.59%,低于对照组(P<0.05)。结论rhBNP联合地尔硫卓可明显改善急性心肌梗死合并心力衰竭患者心功能,提高HRV,降低MACE发生率,安全性高。