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亚苄基乙酰苯的液相加氢：溶剂、催化剂载体、金属种类及反应条件的影响(英文)

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Chinese Journal of Catalysis 2011年第8期32卷 1312-1322页

作者： Achim STOLLE Christine SCHMger Bernd ONDRUSCHKA Werner BONRATH Thomas F. KELLER Klaus D. JANDT Institute for Technical Chemistry and Environmental Chemistry (ITUC) Friedrich-Schiller University Jena Institute for Technical Chemistry and Environmental Chemistry (ITUC) Friedrich-Schiller University Jena R&D Chemical Process Technology DSM Nutritional ProductsP.O. Box 2676 Institute of Materials Science and Technology (IMT) Friedrich-Schiller University Jena

Innovative catalysts based on a "porous glass" support material were developed and investigated for the reduction of benzalace-tophenone. The easy preparation conditions and possibility to use different metals (e.g. Pd, Pt, Rh) for impregnation gave a broad variety of these catalysts. Hydrogenation experiments with these supported catalysts were carried out under different hydrogen pressures and temperatures. Porous glass catalysts with Pd as the active component gave chemoselective hydrogenation of benzalacetophenone, while Pt- and Rh-catalysts tended to further reduce the carbonyl group, especially at elevated hydrogen pressures and temperatures. Kinetic analysis of the reactions revealed these had zero order kinetics, which was independent of the type of porous glass support and solvent used.

关键词： chalcone hydrogenation porous glass supported catalyst

Recent Developments in the Analytical Performance of Low Power TXRF Spectrometry

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Recent Developments in the Analytical Performance of Low Pow...

Effect of process parameters on additive-free electrospinning of regenerated silk fibroin nonwovens

第三届全国环境化学学术大会

作者： Armin Gross Ulrich Waldschlger Hagen Stosnach RNTEC AG Schwarzschildstrasse 12 D-12489 BerlinGermany RNTEC AG Schwarzschildstrasse 12 D-12489 BerlinGermany RNTEC AG Schwarzschildstrasse 12 D-12489 BerlinGermany

＜正＞Total Reflection X-Ray Fluorescence Spectroscopy （TXRF） is a well established analytical method for trace element analysis. Benefits are the easy quantification by internal standardization, the fast sample pre... 详细信息

关键词： TXRF XRF AAS ICP trace elements detection limits fresh water analysis sewage analysis aerosols soil analysis

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Bioactive Materials 2020年第2期5卷 241-252页

作者： Alexander Kopp Ralf Smeets Martin Gosau Nadja Kröger Sandra Fuest Marius Köpf Magnus Kruse Judith Krieger Rico Rutkowski Anders Henningsen Simon Burg Fibrothelium GmbH AachenGermany Department of Oral and Maxillofacial Surgery University Medical Center Hamburg-EppendorfHamburgGermany Department of Oral and Maxillofacial Surgery Division of Regenerative Orofacial MedicineUniversity Medical Center Hamburg-EppendorfHamburgGermany Institut Fuer Textiltechnik of RWTH Aachen University AachenGermany Department of Oral and Maxillofacial Surgery German Armed Forces HospitalHamburgGermany Department of Plastic Reconstructive and Aesthetic SurgeryUniversity Hospital of CologneCologneGermany

Silk fibroin is a biomaterial with multiple beneficial properties for use in regenerative medicine and tissue *** dissolving and processing the reconstituted silk fibroin solution by electrospinning,the arrangement and size of fibers can be manifold varied and according fiber diameters reduced to the nanometer *** nonwovens show high porosity as well as potential ***,electrospinning of most biomaterials demands for the application of additives,which enable stable electrospinning by adjusting viscosity,and are intended to evaporate during processing or to be washed out ***,the use of such additives increases costs and has to be taken into account in terms of biological risks when used for biomedical *** this study,we explored the possibilities of additive-free electrospinning of pure fibroin nonwovens and tried to optimize process parameters to enable stable *** used natural silk derived from the mulberry silkworm Bombyx *** degumming,the silk fibroin was dissolved and the viscosity of the spinning solution was controlled by partial evaporation of the initial solving *** way,we were able to completely avoid the use of additives and manufacture nonwovens,which potentially offer higher biocompatibility and reduced *** and relative humidity during electrospinning were systematically varied(25–35°C,25–30%RH).In a second step,the nonwovens optionally underwent methanol treatment to initiate beta-sheet formation in order to increase structural integrity and *** surface analysis on the different nonwovens was performed using scanning electron microscopy and supplemented by additional mechanical *** was evaluated using BrdU-assay,XTT-assay,LDH-assay and live-dead *** findings were,that an increase of temperature and relative humidity led to unequal fiber diameters and defective *** to penetration decr

关键词： Fibroin Additive-free electrospinning Nanofiber Silk Scaffolds

Analysis of the Surface Passivation Mechanisms of p-Doped Crystalline Silicon by Two Different Al₂O₃ Coatings via Transient Photo-Conductance Measurements

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Journal of Materials Science and Chemical Engineering 2016年第2期4卷 32-39页

作者： David Klein Wiebke Ohm Martin Krü ger Marinus Kunst Helmholtz-Zentrum Berlin fü r Materialien und Energie Institute Solar Fuels (E-IF) Berlin Germany Helmholtz-Zentrum Berlin fü r Materialien und Energie Institut f&uuml r Heterogene Materialsysteme (E-IH) Berlin Germany

In this paper, contactless transient photo-conductance measurements are applied to p-doped mono-crystalline Silicon (p-Si) coated by two different kinds of aluminum oxide (Al2O3) layers in order to study alternative routes to the standard atomic layer deposition (ALD). The aluminum oxides layers were deposited by either spin coating or ion layer gas reaction (ILGAR?). For both coatings an increase of the charge carrier life time is observed indicating a passivation of the p-Si surface. This study shows alternative deposition methods and the potential of transient photocon- ductance measurements for the elucidation of the origin of the passivation. We show that the passivation induced by coating deposited via ILGAR is at least partially due to charge carrier trapping and storage at the interface. It was also surprisingly found that for those coatings, annealing at 425℃ leads to a decrease of the life time. This points to temperature instability for both coatings.

关键词： Photo-Conductance Passivation Aluminum Oxide Silicon

不同类型风电机组对小干扰和暂态稳定性的影响

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电力系统自动化 2013年第17期37卷 23-29,135页

作者：和萍文福拴薛禹胜 Ledwich ger ARD 李思岑华南理工大学电力学院广东省广州市510640 郑州轻工业学院电气信息工程学院河南省郑州市450002 浙江大学电气工程学院浙江省杭州市310027 南瑞集团公司(国网电力科学研究院) 江苏省南京市210003 澳大利亚昆士兰科技大学

随着风电装机容量在电力系统中渗透率的逐步提高,其对电力系统的影响越来越明显。这样,就很有必要系统地分析风电机组对电力系统小干扰和暂态稳定性的影响,以便研究针对性措施。在此背景下,对3类常见的风电机组接入后的电力系统稳定性... 详细信息

随着风电装机容量在电力系统中渗透率的逐步提高,其对电力系统的影响越来越明显。这样,就很有必要系统地分析风电机组对电力系统小干扰和暂态稳定性的影响,以便研究针对性措施。在此背景下,对3类常见的风电机组接入后的电力系统稳定性进行了系统的比较研究。首先给出了这3类风电机组的动态模型,之后以美国西部联合电力系统(WSCC)3机9节点系统为例,采用特征值分析和动态时域仿真方法,系统地比较了在同一母线接入异步风电机组、双馈风电机组、永磁直驱风电机组与接入同等容量同步发电机组对小干扰稳定和暂态稳定性的影响。研究结果表明,3类风电机组并网对小干扰稳定和暂态稳定性的影响程度均有所不同。

关键词：电力系统风电并网风电机组小干扰稳定暂态稳定

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固氮根瘤菌(Azorhizoboium)在人工诱发小麦类根瘤中的固氮作用

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中国科学:化学 1992年第7期 712-716+788页

作者：陈廷伟,Siegfried Scherer,Peter Bger 中国农业科学院土壤肥料研究所 Bacteriological Lehrstuhl 北京 100081 Institute Faculty of Agriculture Technical University Mǖnchen D-8050 Freising germany fǖr Physiologie und Biochemie der Pflanzen Universitat Konstanz D-7750 konstanz germany

用低浓度类似于植物生长激素吲哚乙酸的合成物2,4-二氯苯氧乙酸(2,4,-D)处理小麦根部能诱发瘤状结构(类根瘤),结瘤小麦植株生长不受2,4-D处理影响。这些类根瘤可被从热带豆科植物毛萼田菁(Sesbania rostrata)茎瘤中分离的耐氧茎瘤固氮... 详细信息

用低浓度类似于植物生长激素吲哚乙酸的合成物2,4-二氯苯氧乙酸(2,4,-D)处理小麦根部能诱发瘤状结构(类根瘤),结瘤小麦植株生长不受2,4-D处理影响。这些类根瘤可被从热带豆科植物毛萼田菁(Sesbania rostrata)茎瘤中分离的耐氧茎瘤固氮根瘤菌(Azorhizobium caulinodans)侵染,使类根瘤内的细胞间隙和细胞内有大量菌体增殖,有茎瘤固氮根瘤菌拓殖的类根瘤不仅能还原乙炔,而且还能将固定的氮素转移给植株,向结瘤小麦提供16—23％的氮素。

关键词：固氮根瘤菌固氮根瘤小麦

On the material dependency of peri-implant morphology and stability in healing bone

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Bioactive Materials 2023年第10期28卷 155-166页

作者： Stefan Bruns Diana Krüger Silvia Galli D.C.Florian Wieland Jorg U.Hammel Felix Beckmann Ann Wennerberg Regine Willumeit-Romer Berit Zeller-Plumhoff Julian Moosmann Institute of Metallic Biomaterials Helmholtz-Zentrum HereonMax-Planck-Str.121502GeesthachtGermany University of Malmo Faculty of OdontologyDepartment of ProsthodonticsCarl Gustafs Vag 34Klerken20506MalmoSweden Institute of Materials Physics Helmholtz-Zentrum HereonMax-Planck-Str.121502GeesthachtGermany University of Gothenburg Institute of OdontologyDepartment of ProsthodonticsMedicinaregatan 12 f41390GoteborgSweden

The microstructural architecture of remodeled bone in the peri-implant region of screw implants plays a vital role in the distribution of strain energy and implant *** present a study in which screw implants made from titanium,polyetheretherketone and biodegradable magnesium-gadolinium alloys were implanted into rat tibia and subjected to a push-out test four,eight and twelve weeks after *** were 4 mm in length and with an M2 *** loading experiment was accompanied by simultaneous three-dimensional imaging using synchrotron-radiation microcomputed tomography at 5μm *** deformation and strains were tracked by applying optical flow-based digital volume correlation to the recorded image *** stabilities measured for screws of biodegradable alloys were comparable to pins whereas non-degradable biomaterials experienced additional mechanical ***-implant bone morphology and strain transfer from the loaded implant site depended heavily on the biomaterial *** implants stimulated rapid callus formation displaying a consistent monomodal strain profile whereas the bone volume fraction in the vicinity of magnesium-gadolinium alloys exhibited a minimum close to the interface of the implant and less ordered strain *** in our data suggest that implant stability benefits from disparate bone morphological properties depending on the biomaterial *** leaves the choice of biomaterial as situational depending on local tissue properties.

关键词： Biodegradable implant materials Bone mechanical testing Implant stability Synchrotron micro-computed tomography imaging Digital volume correlation

Characterization of the Drosophila Atlastin Interactome Reveals VCP as a Functionally Related Interactor

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Journal of Genetics and Genomics 2013年第6期40卷 297-306页

作者： Niamh C.O'Sullivan Nina Dräger Cahir J.O'Kane 4th Floor Burlington Danes BuildingDepartment of MedicineImperial College LondonW12 ONNUnited Kingdom Department of Genetics University of CambridgeDowning StreetCambridge CB2 3EHUnited Kingdom

At least 25 genes,many involved in trafficking,localisation or shaping of membrane organelles,have been identified as causative genes for the neurodegenerative disorder hereditary spastic paraplegia（HSP）.One of the most commonly mutated HSP genes,atlastin-1, encodes a dynamin-like GTPase that mediates homotypic fusion of endoplasmic reticulum（ER） ***,the molecular mechanisms of atlastin-1-related membrane fusion and axonopathy remain *** better understand its mode of action,we used affinity purification coupled with mass spectrometry to identify protein interactors of atlastin in *** of 72 identified proteins revealed that the atlastin interactome contains many proteins involved in protein processing and transport,in addition to proteins with roles in mRNA binding,metabolism and mitochondrial *** highest confidence interactor from mass spectrometry analysis, the ubiquitin-selective AAA-ATPase valosin-containing protein（VCP）,was validated as an atlastin-interacting protein,and VCP and atlastin showed overlapping subcellular ***,VCP acted as a genetic modifier of atlastin：loss of VCP partially suppressed an eye phenotype caused by atlastin overexpression,whereas overexpression of VCP enhanced this *** interactions between atlastin and VCP suggest a functional relationship between these two proteins,and point to potential shared mechanisms between HSP and other forms of neurodegeneration.

关键词： Endoplasmic reticulum Hereditary spastic paraplegias Atlastin Valosin-containing protein

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Universality in Statistical Measures of Trajectories in Classical Billiard Systems

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Applied Mathematics 2015年第8期6卷 1407-1425页

作者： Jean-Franç ois Laprise Ahmad Hosseinizadeh Helmut Krö ger Department of Physics Laval University Qu&eacute bec Canada

For classical billiards, we suggest that a matrix of action or length of trajectories in conjunction with statistical measures, level spacing distribution and spectral rigidity, can be used to distinguish chaotic from integrable systems. As examples of 2D chaotic billiards, we considered the Bunimovich stadium billiard and the Sinai billiard. In the level spacing distribution and spectral rigidity, we found GOE behaviour consistent with predictions from random matrix theory. We studied transport properties and computed a diffusion coefficient. For the Sinai billiard, we found normal diffusion, while the stadium billiard showed anomalous diffusion behaviour. As example of a 2D integrable billiard, we considered the rectangular billiard. We found very rigid behaviour with strongly correlated spectra similar to a Dirac comb. These findings present numerical evidence for universality in level spacing fluctuations to hold in classically integrable systems and in classically fully chaotic systems.

关键词： Classical Chaos Dynamical Billiards Random Matrix Theory Level Spacing Fluctuations Universality