检索结果-南通市图书馆

Temperature-dependent Raman spectroscopic study of ferroelastic K_2Sr(MoO_4)

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2018年第11期27卷 591-595页

作者： Ji zhang de-ming zhang Ran-Ran zhang An Hui Xin Hua University Hefei 230088 China Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences Hefei 230031 China High Magnetic Field Laboratory of the Chinese Academy of Sciences Hefei 230031 China

Raman scattering measurements of K_2 Sr（MoO_4）2 were performed in the temperature range of 25–750？C. The Raman spectrum of the low-temperature phase α-K_2 Sr（MoO_4）2 that was obtained by first-principle calculations indicated that the Raman bands in the wavenumber region of 250–500 cm-1 are related to Mo–O bending vibrations in MoO4 tetrahedra,while the Raman bands in the wavenumber region of 650–950 cm-1 are attributed to stretching vibrations of Mo–O *** temperature-dependent Raman spectra reveal that K_2 Sr（MoO_4）2 exhibits two sets of modifications in the Raman spectra at ～ 150？C and ～ 475？C, attributed to structural phase transitions. The large change of the Raman spectra in the temperature range of 150？C to 475？C suggests structural instability of the medium-temperature phase β-K_2 Sr（MoO_4）2.

关键词： ferroelastics K2Sr(MoO4)2 crystal Raman spectroscopy phase transition

Manufacturability and mechanical reliability study for heterogeneous integration system in display(HiSID)

在线全文

学校读者我要写书评

暂无评论

Advances in Manufacturing 2023年第2期11卷 191-202页

作者： Hao-Hui Long Hui-Cai Ma Jia-Ying Gao Li zhang de-ming zhang Jian-Qiu Chen Huawei device Co. Ltd.Shenzhen518129GuangdongPeople's Republic of China

In this paper,the system on display panel(SoDP)architecture,the primary stage of heterogeneous integration system in display(HiSID),is introduced for the first *** this architecture,the driving components of display,which are supposed to be on the display flexible print circuit(FPC)in traditional architecture,are innovatively integrated onto the backside of display *** the SoDP architecture,the simulated impact strain in the panel fan-out region can decrease about 30%compared to the traditional architecture,and SoDP provides more the 10 mm extra space in the in-plane Y-direction for holding a larger ***,the SoDP is compatible with the current organic laser emitted diode(OLED)and system in package(SiP)*** the primary stage,this paper also presents a comprehensive and extensive analysis on the challenges of the manufacturability for the advanced stage of HiSID from four key technologies perspectives:device miniaturization,massive manufacturing,driving technology,and advanced heterogeneous integration.

关键词： Display Heterogeneous integration system in display(HiSID) Manufacturability Mechanical reliability System on display panel(SoDP)

Transition intensity calculation of Yb:YAG

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2018年第6期27卷 448-453页

作者： Hong-Bo zhang Qing-Li zhang Xing Wang Gui-Hua Sun Xiao-Fei Wang de-ming zhang Dun-Lu Sun School of Aeronautics and Astronautics Engineering Air Force Engineering University Xi＇an 710038 China The Key Laboratory of Photonic devices and Materials of Anhui Province Anhui Institute of Optics and Fine Mechanics Chinese Academy of Sciences Hefei 230031 China

The Yb：YAG is an excellent high-average power and ultra-short pulse laser crystal. Transition intensity parameters A（tp）~k and Huang–Rhys factors are fitted to its emission spectrum by the full-profile fitting method. Calculated results indicate that the emission spectrum of Yb：YAG at cryogenic temperature consists of three pure electron state transitions and two phononassisted transitions, one vibronic transition releases one-phonon of 3 cm^（-1）, and the other vibronic transition absorbs onephonon of 22 cm^（-1）. At 300 K, the phonon assisted transition of 3 cm^（-1） turns into two-or more-phonon assisted *** procedure absorbing phonon can reduce the thermal load of Yb：YAG and improve the laser efficiency, which may be one of the reasons why Yb：YAG has excellent performance. The emission bands of Yb：YAG are broadened thermally, and the peak values decrease by several times. The emission cross sections of Yb：YAG determined by Fuchtbauer–Ladenburg（F–L） formula are remarkably different from those calculated with A（tp）~k, which indicates that it is necessary for a laser material to determine its transition intensity parameters A（tp）~kin order to reasonably evaluate the laser performance.

关键词： transition intensity parameters rare earth photoluminescence Yb^3+ :YAG

ON THE STABILITY OF A LIQUID-FILLED ROTOR

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 1994年第3期6卷 53-63页

作者： Tao ming-de, zhang Wen, Tang Jiongdepartment of Applied Mechanics Fudan University Shanghai 200433 P. R. China

The dynamic stability of a high-spinning liquid-filled rotor with both internal and external damping effects involved in is investigated in this paper. First, in the case of the rotor subjected to a transverse harmonic motion, the dynamic pressure of the liquid acting on the rotor is extracted throuhg a planar flow analysis. Then the equation of perturbed motion for the liquid-filled rotor is derived. The analytical stability criteria as well as the stability boundaries are given. The results are extensions of those given by previous literature.

关键词： rotor clamping dynamic stability routh-hurwitz criterion.

Tongue reconstruction with anterolateral thigh flap for middle-late stage tongue cancer patients

在线全文

学校读者我要写书评

暂无评论

中国口腔颌面外科杂志 2008年第B5期6卷 203-204页

作者： Liao Gui-qing Su Yu-xiong Liu Hai-chao Wang Qin Ou de- ming zhang Tong-han department of Oral and Maxillofacial Surgery Guanghua Schoolof Stomatolog% Sun Yat-sen University Guangzhou 510055China

ALUMINUM CONTENT OF TEA LEAVES AND FACTORSAFFECTING THE UPTAKE OF ALUMINUM FROMSOIL INTO TEA LEAVES

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Geographical Science 2001年第1期11卷 87-91页

作者： XIE Zhong-lei, DONG de-ming, BAO Guo-zhang, WANG Sheng-tian, DU Yao-guo,QIU Li-min (department of Environmental Science and Engineering, Jilin University, Changchun 130023, P. R. China department of Chemistry, Northeast Normal University, Changchun 13002 department of Environmental Science and Engineering Jilin University Changchun P. R. China department of Chemistry Northeast Normal University Changchun P. R. China

Numerous studies indicated that aluminum, the most abundant metallic element within the lithosphere, was considered to be related to some human diseases especially the Alzheimer’s disease. Tea, economically an important beverage in the world, has been found to contain higher concentration of aluminum than many other drinks and foods. Therefore, tea would be a potentially important source of dietary aluminum. In order to understand the sources of aluminum in tea leaves and factors related with aluminum content of tea leaves, an experiment was designed to investigate the relationships of aluminum in tea leaves with leaf age, soil properties and forms of aluminum in soils. The results showed that there were great distinctions in the concentration of aluminum in tea leaves with different leaf age (Alold leaf> Almature leaf> Alyoung leaf). Moreover, soil pH was the major factor controlling the uptake of aluminum from soil into tea leaves. Furthermore, the content of aluminum in tea leaves was better predicated by the soluble aluminum extracted by 0.02mol/L CaCl2.

关键词： aluminum tea leaf soil properties

Transmission Performance Evaluation of Optical Signals Propagating in Microwave Photonic Links

在线全文

学校读者我要写书评

暂无评论

Transmission Performance Evaluation of Optical Signals Propa...

圆柱齿轮径向综合偏差测量与分析方法（英文）

IEEE 2005 International Symposium on Microwave, Antenna, Propagation and EMC Technologies for Wireless Communications

作者： An-Jun zhang*, Min Rao, Yong Qiao, ming-de zhang and Xiao-Han Sun* department of Electronics Engineering, Southeast University, Nanjing, 210096, China

A simulator of optical signals propagating in microwave photonic link over WDM system is proposed. By use of modified SSFM solving CNLS, it can simulate propagation of optical signals modulated by mic

关键词： Microwave photonics, WDM, PMD, crosstalk, nonlinear effects.

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

机床与液压 2015年第12期43卷 71-76页

作者：张明德王加林重庆理工大学机械工程学院重庆400054

针对圆柱齿轮传动过程中的振动、噪声及径向综合偏差难以快速检测的问题,应用了经典的双面啮合齿轮测量机理,设计出了一种适应于生产现场的圆柱齿轮制造精度误差快速检测的综合滚动检查机。生产现场的100个同规格圆柱齿轮经由以上分析... 详细信息

针对圆柱齿轮传动过程中的振动、噪声及径向综合偏差难以快速检测的问题,应用了经典的双面啮合齿轮测量机理,设计出了一种适应于生产现场的圆柱齿轮制造精度误差快速检测的综合滚动检查机。生产现场的100个同规格圆柱齿轮经由以上分析方法进行了相关实验,并将传动过程中产生的振动、噪声及径向综合偏差在MATLAB平台下输出曲线图。最后,精确检测出轮齿表面制造误差及缺陷,实现了出厂齿轮快速分拣动作,为工厂快速评定齿轮传动质量优劣提供了一种行之有效的测量方法。

关键词：圆柱齿轮径向综合偏差快速分拣双面啮合

Investigation of bubbles escape behavior from low basicity mold flux for high-Mn high-Al steels using 3D X-ray microscope

在线全文

学校读者我要写书评

暂无评论

International Journal of Minerals,Metallurgy and Materials 2025年第1期32卷 102-110页

作者： Qiang Liu Xiang Li Shen Du ming Gao Yanbin Yin Jiongming zhang State Key Laboratory of Advanced Metallurgy University of Science and Technology BeijingBeijing 100083China

During the continuous casting process of high-Mn high-Al steels,various types of gases such as Ar need to escape through the top of the *** which,the behavior of bubbles traversing the liquid slag serves as a restrictive link,closely associated with viscosity and the thickness of liquid *** contrast to two-dimensional surface observation,three-dimensional(3D)analysis method can offer a more intuitive,accurate,and comprehensive ***,this study employs a 3D X-ray microscope(3D-XRM)to obtained spatial distribution and 3D morphological characteristics of residual bubbles in mold flux under different basicity of liquid slag,different temperatures,and different holding *** results indicate that as basicity of slag increases from 0.52 to 1.03,temperature increases from 1423 to 1573 K,the viscosity of slag decreases,the floating rate of bubbles *** addition,when holding time increases from 10 to 30 s,the bubbles floating distance increases,and the volume fraction and average equivalent sphere diameter of the bubbles solidified in the mold flux gradually *** one word,increasing the basicity,temperature,and holding time leading to an increase in the removal rate of bubbles especially for the *** findings of bubbles escape behavior provide valuable insights into optimizing low basicity mold flux for high-Mn high-Al steels.

关键词： mold flux low basicity bubbles three-dimensional X-ray microscope viscosity