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Study of photocurrent generation in InP nanowire-based p＋-i-n＋ photodetectors

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Nano Research 2014年第4期7卷 544-552页

作者： Vishal Jain Ali Nowzari Jesper Wallentin Magnus T. Borgstrom Maria E. Messing damir asoli Mariusz Graczyk Bemd Witzigmann Federico Capasso Lars Samuelson Hakan Pettersson Solid State Physics and the Nanometer Structure Consortium Lund University Box 118 5E-221 O0 Lund Sweden Laboratory of Mathematics Physics and Electrical Engineering Halmstad University Box 823 SE-301 - 18 Halmstad Sweden Sol Voltaics AB Ideon Science Park Scheelevagen 17 SE-22370 Lund Sweden Department of Computational Electronics and Photonics University ofKassel Wilhelmshoeher Allee 71 D-34121 Kassel Germany School of Engineering and Applied Sciences Harvard University Cambridge Massachusetts 02138 USA

We report on electrical and optical properties of p＋-i-n＋ photodetectors/solar cells based on square millimeter arrays of InP nanowires （NWs） grown on InP substrates. The study includes a sample series where the p＋-segment length was varied between 0 and 250 nm, as well as solar cells with 9.3% efficiency with similar design. The electrical data for all devices display clear rectifying behavior with an ideality factor between 1.8 and 2.5 at 300 K. From spectrally resolved photocurrent measurements, we conclude that the photocurrent generation process depends strongly on the p^-segment length. Without a p＋-segment, photogenerated carriers funneled from the substrate into the NWs contribute strongly to the photocurrent. Adding a p＋-segment decouples the substrate and shifts the depletion region, and collection of photogenerated carriers, to the NWs, in agreement with theoretical modeling. In optimized solar cells, clear spectral signatures of interband transitions in the zinc blende and wurtzite InP layers of the mixed-phase i-segments are observed. Complementary electroluminescence, transmission electron microscopy （TEM）, as well as measurements of the dependence of the photocurrent on angle of incidence and polarization, support our interpretations.

关键词： nanophotonics nanowires infrared (IR) photodetectors solar cells

Astrocytic calcium waves:unveiling their roles in sleep and arousal modulation

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Neural Regeneration Research 2024年第5期19卷 984-987页

作者： Erxi Wu Dan Qi damir Nizamutdinov Jason H.Huang Department of Neurosurgery and Neuroscience Institute Baylor Scott&White HealthTempleTXUSA Texas A&M University School of Medicine TempleTXUSA Texas A&M University School of Pharmacy College StationTXUSA LIVESTRONG Cancer Institutes and Department of Oncology Dell Medical Schoolthe University of Texas at AustinAustinTXUSA Department of Neurosurgery Baylor College of MedicineTempleTXUSA

Neuron-astrocyte interactions are vital for the brain’s *** astrocyte activities is crucial for comprehending the complex neural network,particularly the population-level functions of neurons in different cortical states and associated behaviors in *** on animal sleep and wakefulness have revealed distinct cortical synchrony patterns between ***,outnumbering neurons by nearly fivefold,support and regulate neuronal and synaptic *** research on astrocyte activation during cortical state transitions has emphasized the influence of norepinephrine as a neurotransmitter and calcium waves as key components of ion channel *** summary focuses on a few recent studies investigating astrocyte-neuron interactions in mouse models during sleep,wakefulness,and arousal levels,exploring the involvement of noradrenaline signaling,ion channels,and glutamatergic signaling in different cortical *** findings highlight the significant impact of astrocytes on large-scale neuronal networks,influencing brain activity and *** astrocytic signaling pathways shows promise for treating sleep disorders and arousal *** research is needed to understand astrocytic calcium signaling in different brain regions and its implications for dysregulated brain states,requiring future human studies to comprehensively investigate neuron-astrocyte interactions and pave the way for therapeutic interventions in sleep-and arousal-related disorders.

关键词： arousal astrocyte calcium waves locus coeruleus neuron-astrocyte interaction norepinephrine sleep wakefulness

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半开窄管道中泰勒弥散对火焰影响的数值研究

工程热物理学报 2024年第9期45卷 2847-2852页

作者：陈灿若 VALIEV damir 热科学与动力工程教育部重点实验室清华大学能源与动力工程系北京100084 清华大学燃烧能源中心北京100084

本文采用直接数值模拟方法对无量纲管径、热膨胀系数、刘易斯数和泽尔多维奇数进行大量参数研究,讨论半开放窄管道中泰勒弥散效应对于预混合火焰(在闭口端点燃向开口端传播)传播的影响。数值模拟结果阐释了火焰燃烧速率与管径之间的非... 详细信息

本文采用直接数值模拟方法对无量纲管径、热膨胀系数、刘易斯数和泽尔多维奇数进行大量参数研究,讨论半开放窄管道中泰勒弥散效应对于预混合火焰(在闭口端点燃向开口端传播)传播的影响。数值模拟结果阐释了火焰燃烧速率与管径之间的非单调依赖关系,这种非常规的依赖关系进一步揭示了泰勒弥散效应与火焰拉伸效应的相互竞争。此外,本文基于大量数值模拟计算总结了泰勒弥散效应主导火焰行为的管径和热膨胀系数范围。本文还发现,由于泰勒弥散效应主导下火焰增厚和不易拉伸的特点,使得刘易斯数和泽尔多维奇数对于窄管道中火焰燃烧速率和火焰结构的影响非常微弱。

关键词：泰勒弥散厚火焰数值模拟

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生物乙醇水汽重整Co基催化剂的设计制备

生物乙醇水汽重整Co基催化剂的设计制备

作者： Khasanov damir 北京化工大学

学位级别：硕士

本研究设计制备负载型钴基催化剂用于乙醇水汽重整反应促进产氢研究。本研究旨在提高生产过程中的产氢效率和氢气产率。乙醇水汽重整是一个涉及大量基元反应的复杂过程。它的难点在于它沿着一种导致与主产物氢气相竞争的副产物（主要是C... 详细信息

本研究设计制备负载型钴基催化剂用于乙醇水汽重整反应促进产氢研究。本研究旨在提高生产过程中的产氢效率和氢气产率。乙醇水汽重整是一个涉及大量基元反应的复杂过程。它的难点在于它沿着一种导致与主产物氢气相竞争的副产物（主要是CO,CO2和CH4）大量出现的机制进行。此外,不期望的产物如积碳的频繁出现可导致催化剂的失活。根据所使用催化剂的不同,某些反应比其他反应更容易进行,因此它们的选择在重整过程中起着至关重要的作用。这就是为什么对可能的催化剂进行研究,以最大限度地提高乙醇的转化率和氢气的选择性,从而最大限度地减少其他化合物（如具有毒性的CO）的产生是本研究的兴趣所在。因此,制备作为活性金属的Co催化剂用于乙醇水汽重整反应为本研究项目的主要目标。1.使用沉积-沉淀方法合成了两种单金属和五种双金属x Ni（10-x）Co/SBA-15催化剂（x=10,9,8,7,5,2和0,总金属载量为10wt%）。已经确定了乙醇反应蒸汽重整的催化性能并与其物理和化学状态相关联。镍载量不低于5%的催化体系具有良好的活性,对氢气的选择性较高。发现Ni/Co比为8/2的双金属催化剂的催化活性显着增强。这种增强归因于活性金属在支撑表面上分散性的提高。此外,催化剂表现出更高的稳定性和更好的抗积碳能力。2.合成了包括SiO2、SBA-15、MCM-41和Al-MCM-41在内的各种硅基载体,并使用沉积-沉淀方法将钴沉积到其上。该催化剂在乙醇蒸汽重整反应中表现出适度的活性,但具有较高的稳定性和抗积碳性。在催化剂中,Co/SBA-15显示出最佳的催化活性,可能是由于金属的高分散性。然而,尽管其高活性和分散性,该催化剂具有较低的稳定性,并且钴纳米颗粒容易烧结。3.在钴基催化剂中加入Ce、La、Zr、Mg等一系列助剂对Co/SBA-15催化剂进行了改性,以改善催化剂在乙醇水汽重整过程中的催化活性。所有催化剂均采用沉积-沉淀法合成。后续的表征和催化结果显示助剂掺杂对SBA-15载体产生的积极效果。那些金属载体相互作用更强的催化剂,也显示出活性相的高分散性。对所研究催化剂的活性评价结果表明,性能最佳的催化剂是Co/Ce SBA-15,因为它实现了高乙醇转化率,高H2选择性,因此获得了高氢气产率。该催化剂还具有高稳定性和弱积碳性。还发现将催化剂的还原温度从500℃提高到600℃后,乙醇转化率和氢气产率显著提升。

关键词：钴基催化剂积碳抑制乙醇水汽重整制氢二氧化硅载体

Anticancer therapeutic strategies for targeting mutant p53-Y220C

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Journal of Biomedical Research 2024年第3期38卷 222-232页

作者： Vitaly Chasov damir Davletshin Elvina Gilyazova Regina Mirgayazova Anna Kudriaeva Raniya Khadiullina Youyong Yuan Emil Bulatov Institute of Fundamental Medicine and Biology Kazan Federal UniversityKazan 420008Russia Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry Russian Academy of SciencesMoscow 117997Russia Institute of Life Sciences School of MedicineSouth China University of TechnologyGuangzhouGuangdong 510006China

The tumor suppressor p53 is a transcription factor with a powerful antitumor activity that is controlled by its negative regulator murine double minute 2(MDM2,also termed HDM2 in humans)through a feedback *** the same time,TP53 is the most frequently mutated gene in human *** p53 proteins lose wild-type p53 tumor suppression functions but acquire new oncogenic properties,among which are deregulating cell proliferation,increasing chemoresistance,disrupting tissue architecture,and promoting migration,invasion and metastasis as well as several other pro-oncogenic *** oncogenic p53 mutation Y220C creates an extended surface crevice in the DNA-binding domain destabilizing p53 and causing its denaturation and *** cavity accommodates stabilizing small molecules that have therapeutic *** development of suitable small-molecule stabilizers is one of the therapeutic strategies for reactivating the Y220C mutant *** this review,we summarize approaches that target p53-Y220C,including reactivating this mutation with small molecules that bind Y220C to the hydrophobic pocket and developing immunotherapies as the goal for the near future,which target tumor cells that express the p53-Y220C neoantigen.

关键词： p53 Y220C mutation small molecule DNA-binding domain immunotherapy T cell receptor mimic antibody

狭长通道中火焰声波相互作用的数值模拟与模态分解研究

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清华大学学报(自然科学版) 2024年

作者：缪承希 Louis Benteux damir Valiev 清华大学能源与动力工程系燃烧能源中心

该文通过数值求解可压缩Navier-Stokes方程以及单步不可逆Arrhenius化学动力学,研究了狭长半开放通道内火焰的火焰-声波相互作用过程。运用模态分解技术,具体包括本征正交分解(proper orthogonal decomposition,POD)和谱本征正交分解(sp... 详细信息

该文通过数值求解可压缩Navier-Stokes方程以及单步不可逆Arrhenius化学动力学,研究了狭长半开放通道内火焰的火焰-声波相互作用过程。运用模态分解技术,具体包括本征正交分解(proper orthogonal decomposition,POD)和谱本征正交分解(spectral proper orthogonal decomposition,SPOD)方法,对数值计算结果中的温度场进行了分析,探讨了流动不稳定性(hydrodynamic instability)对火焰振荡过程的影响。POD的前3个模态描述了火焰前锋的褶皱,该过程类似于Darrieus-Landau不稳定性的非线性阶段。SPOD结果表明,火焰前锋上的褶皱运动频率和通道固有频率的基频一致。对涡量场和速度矢量场也进行了SPOD分析。结果表明,在高频模态中观察到了微弱的涡,这与火焰前锋的褶皱运动有关。

关键词：火焰声波相互作用火焰振荡流动不稳定性本征正交分解(POD) 谱本征正交分解(SPOD)

Elucidating elusive quaternary selenide EuCeCuSe3:Synthesis,crystal structure,properties and theoretical studies

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Journal of Rare Earths 2024年第1期42卷 163-171,I0006页

作者： Maxim V.Grigoriev Anna V.Ruseikina Maxim S.Molokeev Vladimir A.Chernyshev Aleksandr S.Aleksandrovsky Alexander S.Krylov Svetlana N.Krylova Nikolai P.Shestakov Dmitriy A.Velikanov Alexander A.Garmonov Alexey V.Matigorov Evgeny A.Ostapchuk Thomas Schleid damir A.Safin Laboratory of Theory and Optimization of Chemical and Technological Processes University of TyumenVolodarskogo Str.6625003TyumenRussian Federation Kirensky Institute of Physics Federal Research Center KSC SB RASAkademgorodok 50 Bld.38660036KrasnoyarskRussian Federation Department of Physics Far Eastern State Transport UniversitySerysheva Str.47680021KrasnoyarskRussian Federation Institute of Natural Sciences and Mathematics Ural Federal University Named After the First President of Russia B.N.YeltsinMira Str.19620002EkaterinburgRussian Federation Department of Photonics and Laser Technology Siberian Federal UniversitySvobodnii Ave.79660079KrasnoyarskRussian Federation Institute of Physics and Technology University of TyumenVolodarskogo Str.6625003 TyumenRussian Federation Institute for Inorganic Chemistry University of StuttgartPfaffenwaldring 55D-70569StuttgartGermany Scientific and Educational and Innovation Center for Chemical and Pharmaceutical Technologies Ural Federal University named after the First President of Russia B.N.YeltsinMira Str.19620002 EkaterinburgRussian Federation University of Tyumen Volodarskogo Str.6625003TyumenRussian Federation

We report on the novel heterometallic quaternary selenide EuCeCuSe3,the fabrication of which has been a challenge until this *** structure of the reported selenide was elucidated from the powder X-ray diffraction data,which revealed the formation of EuCeCuSe3with excellent yield(96.7%)accompanied with a minor fraction of CeSe2(3.3%),and was best solved in orthorhombic space group Pnma with the BaLaCuS3structural ***,the crystal structure of the title compound completes the row of the heterometallic quaternary selenides EuRECuSe3(RE=La,Pr,Nd,Sm,Eu,Gd,Tb,Dy,Ho,Er,Tm,Yb,Lu,Y),of which the cerium-based derivative exclusively belongs to the BaLaCuS3structural *** distortion of the CuSe4polyhedron was compared for the whole series of EuRECuSe3compounds using theτ4-descriptor for four coordinated ions,which revealed the highest degree of distortion for the Ce3+-containing selenide,followed by the La3+-based ***,the crystallographic and geometrical parameters of the reported selenide were discussed in comparison to the Ce3+-based sulfides SrCeCuS3and *** initio calculations of the crystal structure,a phonon spectrum and elastic constants for the crystal of EuCeCuSe3were also *** types and wavenumbers of fundame ntal modes were determined and the involvement of ions participating in the phonon modes was *** experimental IR spectrum of the reported selenide was interpreted and found to be in agreement with the calculated *** experimental direct band gap of EuCeCuSe3was measured to be 1.36 eV that is consistent with the concept of its origin due to interband transitions between orbitals emerging mainly from 4f(valence band)and 5d(conduction band)levels of the Eu2+*** dependence of the Young’s modulus on the direction demonstrates the anisotropy of the elastic properties,while the Vickers hardness for EuCeCuSe3was calculated to be 5.2 ***,the title compound is paramagnetic above 4 K.

关键词： Quaternary selenide Synthesis Crystal structure Ab initio calculations Magnetic measurements Spectroscopy

Single molecule fluorescence fluctuations of the cyanine dyes linked covalently to DNA

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Science China Chemistry 2009年第8期52卷 1148-1153页

作者： AUMILER damir State Key Laboratory of Molecular Reaction Dynamics and Beijing National Laboratory for Molecular Sciences(BNLMS)Institute of ChemistryChinese Academy of Sciences Institute of Physics

The intersystem crossing and isomerization dynamics of free-Cy3,Cy3-ssDNA,free-Cy5 and Cy5-ssDNA are obtained through simple analysis of rapid on/off blinking from single molecule fluorescence intensity time-traces and the fluorescence correlation spectroscopy(FCS).The on-and off-times observed in fluorescence time traces of single cyanine dyes are due to the formation of the triplet state and isomerization,where both the interaction with DNA and long central polymethine chain of cyanine dyes increase the barriers of isomerization,leading to long *** results indicate that the single molecule fluorescence fluctuation together with the resulting second autocorrelation analysis are powerful methods for determining the triplet state and isomerization dynamics,which could be the simple techniques and complementary to other spectroscopic techniques,such as fluorescence decay measurement and laser flash photolysis to study the photophysical processes of complex molecules.

关键词： cyanine dyes single molecule spectroscopy on/off blinking fluorescence correlation spectroscopy(FCS)

The roles of black phosphorus in performance enhancement of halide perovskite solar cells

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Journal of Energy Chemistry 2022年第4期31卷 672-683页

作者： damir Aidarkhanov Charles Surya Annie Ng Department of Electrical and Computer Engineering School of Engineering and Digital SciencesNazarbayev UniversityKabanbay Batyr Ave.53Nur-Sultan 010000Kazakhstan Innovation and Technology Commission Central Government Offices2 Tin Mei AvenueHong Kong 999077China

Hybrid organic-inorganic perovskite solar cells(PSCs) are considered to be the most promising thirdgeneration photovoltaic(PV) technology with the most rapid rate of increase in the power conversion efficiency(PCE). To date, their PCE values are comparable to the established photovoltaic technologies such as crystalline silicon. Intensive research activities associated with PSCs have been being performed,since 2009, aiming to further boost the device performance in terms of efficiency and stability via different strategies in order to accelerate the progress of commercialization. The emerging 2 D black phosphorus(BP) is a novel class of semiconducting material owing to its unique characteristics, allowing them to become attractive materials for applications in a variety of optical and electronic devices, which have been comprehensively reviewed in the literature. However, comprehensive reviews focusing on the application of BP in PSCs are scarce in the community. This review discusses the research works with the incorporation of BP as a functional material in PSCs. The methodology as well as the effects of employing BP in different regions of PSCs are summarized. Further challenges and potential research directions are also highlighted.

关键词： Perovskite solar cells Black phosphorus Power conversion efficiency Stability Low dimensional materials