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Influence of Microstructures on Thermal Shock and Sintering Behavior of YSZ-based Thermal Barrier Coatings

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表面技术 2019年第4期48卷 28-33页

作者： Kirsten Bobzin lidong zhao Mehmet ?te Tim K?nigstein Surface Engineering Institute RWTH Aachen University

In this study, two thermal barrier coatings based on YSZ were produced by using a commercially available agglomerated and sintered powder and a special spray powder prepared by high energy ball milling. Both thermal barrier coatings exhibited similar overall porosities, but significantly different microstructures. Application of the special spray powder prepared by high energy ball milling led to a microstructure with numerous inclusions of semi-molten agglomerates, which introduced a plethora of clusters of fine pores into the coating and several more microstructural defects. This microstructure resulted in a significantly better thermal shock behavior compared to the conventional thermal barrier coating. The heat treatment of both thermal barrier coatings atθ=1150℃for t=100 h led to a sintering of both coatings. The results were reduced overall porosity and significantly increased fracture toughness. A correlation between the fracture toughness of both coatings after the heat treatment and the thermal shock life time could not be identified.

关键词： thermal barrier coating ZrO2-7%Y2O3 high energy ball milling thermal shock

Synergistically optimizing electrical and thermal transport properties of ntype PbSe

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Progress in Natural Science:Materials International 2018年第3期28卷 275-280页

作者： Xin Qian Yu Xiao Cheng Chang Lei Zheng lidong zhao School of Materials Science and Engineering Beihang University

In this paper,we report that the thermoelectric performance of n-type Pb Se could be improved through synergistically optimizing electrical and thermal transport properties via Sb doping and Mg *** carrier concentration was firstly optimized through Sb doping,resulting in a maximum power factor of15.4μW cm-1K-2and maximum ZT of0.9 at 873 K in ***,Mg was selected for alloying in Pb sites to produce point defects,which can largely intensify the phonon scattering and lower thermal *** Mg alloying,the thermal conductivity at 300 K（873 K）was significantly suppressed from4.6 Wm-1K-1(1.5 Wm-1K-1)for Pb0.99Sb0.01Se to2.9 Wm-1K-1(1.1 Wm-1K-1)for Pb0.99Sb0.01Se-6%Mg *** combining Sb doping and Mg alloying,a maximum ZT of1.1 was achieved at 873 K for Pb0.99Sb0.01Se-6%Mg Se,and the average ZT(ZTave)was increased by 28.6%from0.42 for Pb0.99Sb0.01Se to0.54 for Pb0.99Sb0.01Se-6%Mg *** results indicate that Pb Se is a robust candidate for medium-temperature thermoelectric applications.

关键词： Thermoelectric n-type PbSe Seebeck coefficient Thermal conductivity Average ZT

Subjective tinnitus: lesion-induced pathological central homeostasis remodeling

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Journal of Otology 2021年第4期16卷 266-272页

作者： Qi Zhang lidong zhao Weidong Shen Shiming Yang Department of Otolaryngology Head and Neck SurgeryInstitute of OtolaryngologyChinese PLA General HospitalFuxing Street NO.28Haidian DistrictBeijing100039China

Subjective tinnitus is the most common type of tinnitus, which is the manifestation of pathologicalactivities in the brain. It happens in a substantial portion of the general population and brings significantburden to the society. Severe subjective tinnitus can lead to depression and insomnia and severely affectspatients’ quality of life. However, due to poor understanding of its etiology and pathogenesis, treatmentof subjective tinnitus remains challenging. In recent decades, a growing number of studies have shownthat subjective tinnitus is related to lesion-induced neural plasticity of auditory and non-auditory centralsystems. This article reviews cellular mechanisms of neural plasticity in subjective tinnitus to providefurther understanding of its pathogenesis.

关键词： Tinnitus Neural plasticity Homeostasis Interneuron GABA Pyramidal neuron

Influence of direct electric current on wetting behavior during brazing

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Frontiers of Mechanical Engineering 2020年第3期15卷 496-503页

作者： Kirsten BOBZIN Wolfgang WIETHEGER Julian HEBING lidong zhao Alexander SCHMIDT Riza ISKANDAR Joachim MAYER Surface Engineering Institute(IOT) RWTH Aachen University52072 AachenGermany Central Facility for Electron Microscopy RWTH Aachen University52074 AachenGermany

The wetting behavior of liquid metals is of great importance for many processes. For brazing, however, a targeted modification beyond the adjustment of conventional process parameters or the actual set-up was not possible in the past. Therefore, the effect of direct electric current along the surface of a steel substrate on the wetting behavior and the formation of the spreading pattern of an industrial nickel-based filler metal was investigated at a temperature above T = 1000 °C in a vacuum brazing furnace. By applying direct current up to I = 60 A the wetted surface area could be increased and the spreading of the molten filler metal could be controlled in dependence of the polarity of the electric current. The electric component of the Lorentz force is supposed to be feasible reasons for the observed dependence of the electrical polarity on the filler metal spreading direction. To evaluate the influence of the electric current on the phase formation subsequent selective electron microscope analyses of the spreading pattern were carried out.

关键词： brazing electric current assisted wetting Lorentz force

Molecular genetic studies of familial Meniere’s disease

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Science China(Life Sciences) 2019年第11期62卷 1557-1560页

作者： Jing Zhang Jing Guan Hongyang Wang Dayong Wang lidong zhao Huifang Zhou Qiuju Wang Chinese PLA Institute of Otolaryngology Chinese PLA General HospitalMedical School of Chinese PL ABeijing 100853China Department of Otolaryngology of Tianjin Medical University General Hospital Tianjin 300052China

Dear ***'s disease(MD,MIM 156000),a chronic clinical illness affecting the inner ear,presents as episodes of spontaneous vertigo,fluctuating sensorineural hearing loss,tinnitus,and aural *** hydrops in the cochlear duct and vestibular organs is considered the underlying histopathologic characteristic of *** MD cases are sporadic(sporadic Meniere's disease,SMD),and approximately 4%-20%of patients with MD have a familial history.

关键词： Meniere familial organs

Transcript variants and expression profiles analysis of Mitf gene in minipigs

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Journal of Otology 2015年第2期10卷 83-86页

作者： Weiwei Guo Lili Ren Lei Chen Yu Ning lidong zhao Shiming Yang Department of OtolaryngologydHead & Neck Surgery Institute of Otolaryngology of PLA Chinese PLA General Hospital State Key Laboratory for Agro-biotechnology China Agricultural University

Object： To identify transcript variants and expression patterns of porcine Mitf. Materials and methods： A pairwise BLAST search at NCBI database was performed to deduce the structure of porcine Mitf gene. Subsequently, 5＇ RACE and fluorescent quantitative RT-PCR were used to analyze the expression pattern of porcine Mitf in different tissues. Results： Four transcript variants of porcine Mitf, MITF-A, MITF-H, MITF-M and MITF-SUS were identified, all sharing high homology with those in humans, except ***： The sequence of porcine Mitf appear highly homologous to human MITF. However, only 4 transcript variants of porcine Mitf were identified in these minipigs, less than the 9 transcript variants in human MITF.

关键词： Minipigs MITF/Miff gene Transcript variants

HYPERBILIRUBINEMIA AND AUDITORY NEUROPATHY

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Journal of Otology 2013年第1期8卷 1-5页

作者： zhao lidong Wei Xiaoquan Cong Tao Guo Weiwei Lin Chang Yang Shiming Department of Otolaryngology Head and Neck Surgery Institute of OtolaryngologyChinese PLA General Hospital Department of Otolaryngology Head and Neck Surgery the First Affiliated Hospital of Fujian Medical University

Introduction Hyperbilirubinemia is common in the new born owing to their special metabolism *** bilirubin levels are protective because of their antioxidant effects[1],while pathological jaundice is harmful to the hea... 详细信息

关键词： HYPERBILIRUBINEMIA AND AUDITORY NEUROPATHY ABR

Theory on the molecular characteristic contour (II)——Molecular intrinsic characteristic contours of several typical organic molecules

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Science China Chemistry 2005年第2期48卷 89-100页

作者： GONG lidong, zhao Dongxia & YANG Zhongzhi Department of Chemistry, Liaoning Normal University, Dalian 116029, China Correspondence should be addressed to Yang Zhongzhi (email: zzyang@***) 1. Department of Chemistry Liaoning Normal University 116029 Dalian China

The molecular intrinsic characteristic contour (MICC) is defined based on the clas-sical turning point of electron movement in a molecule. Three typical organic molecules, i.e. methane, methanol and formic acid, were employed as examples for detailed introduction of our method. Investigations on the cross-sections of MICC provide important information about atomic size changing in the process of forming molecules. The electron density distributions on the MICCs of these molecules were calculated and shown for the first time. Results showed that the electron density distribution on the MICC correlates closely with molecular chemical properties, and it provides a new insight into molecular boundary.

关键词： molecular intrinsic characteristic contour (MICC) potential acting on an electron in a molecule electron density organic molecules ab initio method.

Theory on the molecular characteristic contour (Ⅱ)——Molecular intrinsic characteristic contours of several typical organic molecules

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Science China Chemistry 2005年第2期48卷 89-100页

作者： GONG lidong zhao Dongxia YANG Zhongzhi Department of Chemistry Liaoning Normal University Dalian 116029 China Department of Chemistry Liaoning Normal University Dalian 116029 China Department of Chemistry Liaoning Normal University Dalian 116029 China

关键词： molecular intrinsic characteristic contour (MICC), potential acting on an electron in a molecule, electron density, organic molecules, ab initio method.