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| 1 | 软X射线显微术和光谱显微术(英文)显示文摘X射线显微术可直接在水环境中对胶体颗粒尺寸范围内的颗粒进行高分辨率成像,将该项技术与高分辨率光谱相结合,还可用于光谱显微研究。其中,常用的两种X射线显微镜是透射显微镜和扫描透射显微镜,文中示出了它们的装置图。由于X射线显微镜能迅速拍下一物体的高分辨率图像,所以,作为一种分析仪器,扫描X射线显微镜更适合作光谱显微研究。作为形态学目视化的一个示例,本文用一台透射X射线显微镜拍摄了粘土和土壤样品的图像。根据X射线图像进行的低温层析实验所获得的图像得到了有关细菌构成的显微生存环境以及其它土壤胶状体的3D结构信息。对扫描透射X射线显微镜拍摄的一系列图像进行分析,得到了土壤样品的形貌特性和化学特性。 | J Thieme S Gleber G Mitrea P Guttmann | 2007 | 光学精密工程2007，15，12： | 5 |
| 2 | Improved performance of UVC-LEDs by combination of high-temperature annealing and epitaxially laterally overgrown AlN/sapphire显示文摘We report on the performance of AlGaN-based deep ultraviolet light-emitting diodes(UV-LEDs)emitting at 265 nm grown on stripe-patterned high-temperature annealed(HTA)epitaxially laterally overgrown(ELO)aluminium nitride(AIN)/sapphire templates.For this purpose,the structural and electro-optical properties of ultraviolet-c light-emitting diodes(UVC-LEDs)on as-grown and on HTA planar AlN/sapphire as well as ELO AlN/sapphire with and without HTA are investigated and compared.Cathodoluminescence measurements reveal dark spot densities of 3.5×10^9 cm^-2,1.1×10^9 cm^-2,1.4×10^9 cm^-2,and 0.9×10^9 cm^-2 in multiple quantum well samples on as-grown planar AIN/sapphire,HTA planar AlN/sapphire,ELO AlN/sapphire,and HTA ELO AlN/sapphire,respectively,and are consistent with the threading dislocation densities determined by transmission electron microscopy(TEM)and high-resolution X-ray diffraction rocking curve.The UVC-LED performance improves with the reduction of the threading dislocation densities(TDDs).The output powers(measured on-wafer in cw operation at 20 mA)of the UV-LEDs emitting at 265 nm were 0.03 mW(planar AlN/sapphire),0.8 mW(planar HTA AlN/sapphire),0.9 mW(ELO AlN/sapphire),and 1.1 mW(HTA ELO AlN/sapphire),respectively.Furthermore,Monte Carlo ray-tracing simulations showed a 15%increase in light-extraction efficiency due to the voids formed in the ELO process.These results demonstrate that HTA ELO AlN/sapphire templates provide a viable approach to increase the efficiency of UV-LEDs,improving both the internal quantum efficiency and the light-extraction efficiency. | NORMAN SUSILO EVIATHAR ZIFFER SYLVIA HAGEDORN LEONARDO CANCELLARA CARSTEN NETZEL NEYSHA LOBO PLOCH SHAOJUN WU JENS RASS SEBASTIAN WALDE LUCA SULMONI MARTIN GUTTMANN TIM WERNICKE MARTIN ALBRECHT MARKUS WEYERS MICHAEL KNEISSL | 2020 | Photonics Research2020，8，4： | 4 |
| 3 | Electrical properties and microstructure formation of V/Al-based n-contacts on high Al mole fraction n-AlGaN layers显示文摘The electrical and structural properties of V/Al-based n-contacts on n‐AlxGa1−xN with an Al mole fraction x ranging from x=0.75 to x=0.95 are investigated.Ohmic n-contacts are obtained up to x=0.75 with a contact resistivity of 5.7×10^−4Ω·cm^2 whereas for higher Al mole fraction the IV characteristics are rectifying.Transmission electron microscopy reveals a thin crystalline AlN layer formed at the metal/semiconductor interface upon thermal annealing.Compositional analysis confirmed an Al enrichment at the interface.The interfacial nitride-based layer in n-contacts on n‐Al0.9Ga0.1N is partly amorphous and heavily contaminated by oxygen.The role and resulting limitations of Al in the metal stack for n-contacts on n-AlGaN with very high Al mole fraction are discussed.Finally,ultraviolet C(UVC)LEDs grown on n‐Al0.87Ga0.13N and emitting at 232 nm are fabricated with an operating voltage of 7.3 V and an emission power of 120μW at 20 mA in cw operation. | LUCA SULMONI FRANK MEHNKE ANNA MOGILATENKO MARTIN GUTTMANN TIM WERNICKE MICHAEL KNEISSL | 2020 | Photonics Research2020，8，8： | 4 |
| 4 | Recombination mechanisms and thermal droop in AlGaN-based UV-B LEDs显示文摘This paper reports a comprehensive analysis of the origin of the electroluminescence(EL)peaks and of the thermal droop in UV-B AlGaN-based LEDs.By carrying out spectral measurements at several temperatures and currents,(i)we extract information on the physical origin of the various spectral bands,and(ii) we develop a novel closed-form model based on the Shockley–Read–Hall theory and on the ABC rate equation that is able to reproduce the experimental data on thermal droop caused by non-radiative recombination through deep levels.In the samples under test,the three EL bands are ascribed to the following processes:band-to-band recombination in the quantum wells(main EL peak),a parasitic intra-bandgap radiative transition in the quantum well barriers,and a second defect-related radiative process in the p-AlGaN superlattice. | CARLO DE SANTI MATTEO MENEGHINI DESIREE MONTI JOHANNES GLAAB MARTIN GUTTMANN JENS RASS SVEN EINFELDT FRANK MEHNKE JOHANNES ENSLIN TIM WERNICKE MICHAEL KNEISSL GAUDENZIO MENEGHESSO ENRICO ZANONI | 2017 | Photonics Research2017，5，2： | 2 |
| 5 | Part II: Arthroscopic treatment of tibial plateau fractures: Intercondylar eminence avulsion fractures显示文摘 | James H. Lubowitz Wylie S. Elson Dan Guttmann | 2005 | Arthroscopy: The Journal of Arthroscopic and Related Surgery2005，，1： | 2 |
| 6 | The evolution of multiple sclerosis lesions on serial MR显示文摘 | Ahn SS Hsu L | 1995 | AJNR1995，16，： | 1 |
| 7 | Image processing: global and regional changes with age显示文摘 | Killiany R J Meier D S Guttmann C R | 2004 | Top Magn Reson Imaging2004，15，6： | 1 |
| 8 | Functional MRI with variable echo time acquisition 显示文摘 | Chen NK Egorova S Guttmann CR | 2003 | Neuroimage2003，20，4： | 1 |
| 9 | Automatic tube compensation (ATC)显示文摘 | Guttmann J Haberthur C Mols G | | 0，，： | 1 |
| 10 | Regional magnetic resonance imaging lesion burden and cognitive function in multiple sclerosis:a longitudinal study显示文摘 | Sperling RA Guttmann C R Hohol MJ | | 0，，01： | 1 |
| 11 | Part 1: Arthroscopic management of tibial plateau fractures 显示文摘 | Lubowitz J H Elson W S Guttmann D | 2004 | Arthroscopy2004，20，： | 1 |
| 12 | White matter abnormalities in mobility-impaired older persons显示文摘 | Guttmann C Benson R Warfield S K | 2000 | Neurology2000，54，6： | 1 |
| 13 | Arthroscopic manage-ment of tibial plateau fractures显示文摘 | Lubowitz JH Eison WS Guttmann D | 2004 | Arthroscopy2004，20，10： | 1 |
| 14 | The evolution of multiple sclerosis lesions on serial MR显示文摘 | Guttmann CRG Ahn SS Hsu L | 1995 | AJNR1995，16，6： | 1 |
| 15 | The Determinacy of Factor Sore Mtrices with Iplications Fr five Oher Bsic Poblems of Cmmon Fctor Teory 显示文摘 | Guttmann L | 1955 | British Journal of Statistical Psychology1955，，7： | 1 |
| 16 | Arthroscopic treatment of tibial plateau fractures:intercondylar eminence avulsion fractures显示文摘 | Lubowitz JH Elson WS Guttmann D | 2005 | Arthroscopy2005，21，1： | 1 |
| 17 | Reduction of the bacterial load by the saver-coated endotracheal tube(SCET):a laboratory investigation显示文摘 | Hartmann M Guttmann J Muller B | 1999 | Technol Health Care1999，7，5： | 1 |
| 18 | Arthroscopicmanagement of tibial plateau fractures显示文摘 | Lubowitz JH Elson WS Guttmann D | | 0，，： | 1 |
| 19 | What do school counselors gain from their role as psychotherapists显示文摘 | Guttmann J Daniels S | 2001 | Educ Psychol2001，21，2： | 1 |
| 20 | Distinct cleavage patterns of normal and pathologic forms of α-synuclein by calpain I in vitro 显示文摘 | Mishizen-Eberz AJ Guttmann RP Giasson BI | 2003 | J Neurochem2003，86，4： | 1 |
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