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Simulation of the effects of different substrates, temperature,and substrate roughness on the mechanical properties of Al_2O_3 coating as tritium penetration barrier

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Nuclear Science and Techniques 2019年第4期30卷 80-90页

作者： Ze Liu Fei Meng liang-bi Yi Key Laboratory for Radiation Physics and Technology of Ministry of Education Institute of Nuclear Science and Technology Sichuan University Chengdu Youfang Technology Co. Ltd Southwestern Institute of Physics

Residual thermal stress in the system is a serious problem that affects the application of tritium permeation barrier coatings in fusion reactors. The stress not only determines the adhesion between coating and substrate, but also changes the properties of the material. In this study,finite element analysis was used to investigate the relationship between the residual thermal stress and the mechanical properties of Al_2O_3 tritium penetration barrier systems. Moreover, the residual thermal stress influenced by factors such as different substrates, temperature, and substrate roughness was also analyzed. The calculation showed that the hardness and elastic modulus increased with increasing compressive stress. However, the hardness and elastic modulus decreased with increasing tensile stress. The systems composed of Al_2O_3 coatings and different substrates exhibited different trends in mechanical properties. As the temperature increased, the hardness and the elastic modulus increased in an Al_2O_3/316 L stainless steel system; the trend was opposite in an Al_2O_3/Si *** from this, the roughness of the substrate surface in the system could magnify the change in hardness and elastic modulus of the coating. Results showed that all these factors led to variation in the mechanical properties of Al_2O_3 tritium permeation barrier systems. Thus, thedetailed reasons for the changes in mechanical properties of these materials need to be analyzed.

关键词： Finite element analysis Thermal stress Mechanical properties Al2O3 tritium penetration barrier systems Nanoindentation

Preparation and Microstructure of Highly-Oriented LaNiO_3 Thin Films by RF Sputtering Method

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Chinese Journal of Aeronautics 2006年第B12期19卷 142-145页

作者： CHENG Xing-hua QIAO liang bi Xiao-fang School of Materials Science and Engineering BeO＇ing University of Aeronautics and Astronautics Beijing 100083 China

In an attempt of being used as buffer layers and electrodes for the textured BaTiO3 （BTO） ferroelectric thin films, highly （100）-oriented LaNiO3 （LNO） thin films of different thicknesses were deposited directly on Si （100） substrate with radio-frequency （RF） magnetron sputtering method. It is observed that the substrate temperatures and the film thicknesses bring main influences on the microstructures and orientation of the thin film. The effects of the thicknesses and substrate temperatures on the orientation of the films were studied on the LNO films of different thicknesses. The highly （100）-oriented LNO thin films were obtained at the substrate temperature of 600℃. The existence of epitaxially grown BTO films indicates that the oriented LNO thin films obtained in this work could be used as a buffer layer for epitaxial growth.

关键词： LaNiO3 film perovskite orientation risistivity

DcR3 and survivin are highly expressed in colorectal carcinoma and closely correlated to its clinicopathologic parameters

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Journal of Zhejiang University-Science B(biomedicine & biotechnology) 2009年第9期10卷 675-682页

作者： Qi-lian liang bi-rong WANG Guo-hong LI Department of Medical Oncology Affiliated Hospital of Guangdong Medical College Zhanjiang 524001 China

Objective: To investigate the expression of death decoy receptor 3 (DcR3) and survivin in colorectal carcinoma. Methods: Tumor and normal tissues were taken from a total of 100 colorectal carcinoma patients during surgery, and the expression of DcR3 and survivin was examined by immunohistochemistry, Western blotting, and reverse transcription-polymerase chain reaction (RT-PCR) analyses. Results: RT-PCR showed that the expression levels of DcR3 mRNA (0.846±0.242, P<0.01) and survivin mRNA (0.7835±0.2392, P<0.01) in colorectal cancer tissues were significantly higher than those in adjacent normal tissues. Western blotting showed that the expression levels of DcR3 protein (0.795±0.261, P<0.01) and survivin protein (0.6765±0.1351, P<0.01) in tumor tissues were significantly higher than those in non-cancer tissues. The immunohistochemical streptavidin-peroxidase (SP) method showed that the positive expression rates of DcR3 and survivin were 67.0% and 58.0% in colorectal cancer tissues, and 18.0% and 3.0% in non-cancerous colorectal tissues (P<0.05), respectively. The positive correlations of DcR3 (P<0.01) and survivin (P<0.01) to the differentiation of colorectal carcinoma cells, lymph node metastasis, and patho-logical stage were observed. The expression of DcR3 and survivin was found to be positively correlated to clinicopathologic parameters of colorectal carcinoma. Conclusion: The overexpressed DcR3 and survivin in colorectal cancer may contribute to the development of the cancer. The monitoring of these two proteins may be useful for the diagnosis, differentiation, metastasis, and determination of stages of colorectal carcinoma.

关键词： Death decoy receptor 3 (DcR3) Survivin Colorectal carcinoma

Resolution enhancement of nearfield acoustic holography by interpolation using band-limited signal restoration method

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Chinese Science Bulletin 2008年第20期53卷 3142-3150页

作者： XU liang bi ChuanXing CHEN XinZhao CHEN Jian Institute of Sound and Vibration Research Hefei University of Technology Hefei 230009 China

A new method based on interpolation using band-limited signal restoration method was proposed for enhancing the resolution of the nearfield acoustic holography. According to the band-limited property of the pressure on the hologram surface, a band-limited signal restoration method named Papoulis-Gerchberg algorithm was used to realize the interpolation of acoustic pressure. Therefore acoustic pressure data on the hologram surface were increased, the sampling interval was reduced, the information on evanescent waves which was lost because of the large sampling interval was partially recovered, and the resolution of nearfield acoustic holography image was improved. The experimental result shows that the method can enhance the resolution of the nearfield acoustic holography image efficiently.

关键词：近场声学全息术频带限制信号恢复方法分辨率增强插值法

A Regularized LSTM Method for Predicting Remaining Useful Life of Rolling Bearings

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International Journal of Automation and computing 2021年第4期18卷 581-593页

作者： Zhao-Hua Liu Xu-Dong Meng Hua-liang Wei liang Chen bi-liang Lu Zhen-Heng Wang Lei Chen School of Information and Electrical Engineering Hunan University of Science and TechnologyXiangtan 411201China Department of Automatic Control and Systems Engineering University of SheffieldSheffield SI 3JDUK

Rotating machinery is important to industrial production. Any failure of rotating machinery, especially the failure of rolling bearings, can lead to equipment shutdown and even more serious incidents. Therefore, accurate residual life prediction plays a crucial role in guaranteeing machine operation safety and reliability and reducing maintenance cost. In order to increase the forecasting precision of the remaining useful life(RUL) of the rolling bearing, an advanced approach combining elastic net with long short-time memory network(LSTM) is proposed, and the new approach is referred to as E-LSTM. The E-LSTM algorithm consists of an elastic mesh and LSTM, taking temporal-spatial correlation into consideration to forecast the RUL through the LSTM. To solve the over-fitting problem of the LSTM neural network during the training process, the elastic net based regularization term is introduced to the LSTM *** this way, the change of the output can be well characterized to express the bearing degradation mode. Experimental results from the real-world data demonstrate that the proposed E-LSTM method can obtain higher stability and relevant values that are useful for the RUL forecasting of bearing. Furthermore, these results also indicate that E-LSTM can achieve better performance.

关键词： Deep learning fault diagnosis fault prognosis long and short time memory network(LSTM) rolling bearing rotating machinery regularization remaining useful life prediction(RUL) recurrent neural network(RNN)

Duodenal giant stromal tumor combined with ectopic varicose hemorrhage:A case report

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World Journal of Clinical Cases 2020年第23期8卷 6009-6015页

作者： Da-Huan Li Xue-Ying Liu liang-bi Xu Center of Digestive Endoscopy The Affiliated Hospital of Guizhou Medical UniversityGuiyang 550000Guizhou ProvinceChina Department of Gastroenterology Guizhou Medical UniversityGuiyang 550000Guizhou ProvinceChina

BACKGROUND Gastrointestinal stromal tumors(GISTs)are mesenchymal tissue tumors originating from Cajal cells,presenting diverse clinical manifestations due to the different sizes,locations,and growth patterns of the *** is an uncommon site of GISTs,more with gastrointestinal obstruction and bleeding as the first *** duodenal varix,as a rare varix occurring outside the gastroesophageal region,is the main type of heterotopic varices and an unusual cause of gas-trointestinal *** etiology is mainly seen in liver cirrhosis,portal hypertension,vasculitis,portal vein embolism and obstruction caused by various *** of duodenal stromal tumor combined with ectopic variceal hemorrhage are rarely seen;however,when it occurs,the situation can sometimes be urgent and life-threatening,especially when traditional endoscopy and imaging fail to detect the lesion *** SUMMARY We report a 52-year-old female patient who had no obvious inducement to develop black *** in a local hospital revealed that the duodenal horizontal ectopic varices were ruptured and *** metal clamping hemostasis,she still had gastrointestinal bleeding and was transferred to our *** showed that active bleeding was still seen in the horizontal part of duodenum,and suspicious submucosal eminence was seen in the bleeding *** computed tomography showed a huge stromal tumor of duodenum,specimens were pathologically confirmed after *** a 3-mo follow-up,no gastrointestinal hemorrhage and complications *** Ectopic variceal hemorrhage is rare but sometimes *** may be combined with stromal tumor,which can be diagnosed by multiple *** and surgical treatment are effective.

关键词： Duodenal stromal tumor Ectopic varices Gastrointestinal hemorrhage Endoscopic therapy Surgical operation Case report

The pseudospectrum and spectrum(in)stability of quantum corrected Schwarzschild black hole

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Science China(Physics,Mechanics & Astronomy) 2024年第10期67卷 55-75页

作者： Li-Ming Cao Jia-Ning Chen liang-bi Wu Libo Xie Yu-Sen Zhou School of Fundamental Physics and Mathematical Sciences Hangzhou Institute for Advanced StudyUCASHangzhou 310024China Peng Huanwu Center for Fundamental Theory Hefei 230026China Interdisciplinary Center for Theoretical Study and Department of Modern Physics University of Science and Technology of ChinaHefei 230026China

In this study,we investigate the pseudospectrum and spectrum(in)stability of quantum corrected Schwarzschild black ***,we use the hyperboloidal framework to cast the quasinormal mode(QNM)problem into an eigenvalue problem associated with a non-selfadjoint operator,and then the spectrum and pseudospectrum are ***,the invariant subspace method is exploited to improve the computational efficiency for *** investigation into the spectrum(in)stability entails two main *** the one hand,we calculate the spectra of the quantum corrected black hole,then by the means of the migration ratio,the impact of the quantum correction effect on the Schwarzschild black hole has been *** results indicate that the so-called“migration ratio instability”will occur for small black holes with small angular momentum number *** the eikonal limit,the migration ratios remain the same for each *** the other hand,we study the spectrum(in)stability of the quantum corrected black hole by directly adding some particular perturbations into the effective potential,where perturbations are located at the event horizon and null infinity,*** are two interesting observations under the same perturbation energy ***,perturbations at infinity are more capable of generating spectrum instability than those at the event ***,we find that the peak distribution can lead to the instability of QNM spectrum more efficiently than the average distribution.

关键词： quasinormal modes pseudospectrum hyperboloidal coordinate

Mutation of Residue Arginine^18 of Cytochrome b559 α-Subunit and its Effects on Photosystem Ⅱ Activities in Chlamydomonas reinhardtii

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Journal of Integrative Plant biology 2007年第7期49卷 1054-1061页

作者： Jing-Jing Ma liang-bi Li Yu-Xiang Jing Ting-Yun Kuang Key Laboratory of Photosynthesis and Environmental Molecular Physiology Institute of Botany Chinese Academy of Sciences Beijing 100093 China Graduate University of Chinese Academy of Sciences Beijing 100049 China

It has been known that arginine is used as the basic amino acid in the α-subunit of cytochrome bsss （Cyt bsss） except histidine. However, previous studies have focused on the function of histidine in the activities of photosystem （PS） Ⅱ and there are no reports regarding the structural and/or functional roles of arginine in PSll complexes. In the present study, two arginine18 （R18） mutants of Chlamydomonas reinhardtii were constructed using site-directed mutagenesis, in which R18 was replaced by glutamic acid （E） and glycine （G）. The results show that the oxygen evolution of the PSII complex in the R18G and R18E mutants was approximately 60% of wild-type （WT） levels and that, after irradiation at high light intensity, oxygen evolution for the PSll of mutants was reduced to zero compared with 40% in WT cells. The efficiency of light capture by PSll （Fv/Fm） of R18G and R18E mutants was approximately 42%-46% that of WT cells. Furthermore, levels of the α-subunit of Cyt bsss and PsbO proteins were reduced in thylakoid membranes compared with WT. Overall, these data suggest that R18 plays a significant role in helping Cyt bss9 maintain the structure of the PSll complex and its activity, although it is not directly bound to the heme group.

关键词： Chlamydomonas reinhardtii chloroplast transformation cytochrome b559 mutation photosystem Ⅱ.

Release models for leaks from high-pressure hydrogen storage systems

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Chinese Science Bulletin 2014年第19期59卷 2302-2308页

作者： Xue-Fang Li David M. Christopher Jing-liang bi Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Tsinghua University

Simulations and analyses of experimental data from leaks from high-pressure hydrogen storage systems will require knowledge of the stagnation state time histories and stream properties exiting the *** analytical ideal-gas model based on the ideal gas state equation and a computer program making use of the NIST standard reference database(REFPROP)were developed to model the entire process of leaks from high-pressurized hydrogen gas *** results obtained by the two methods agree with each other *** the gas behavior departs from the ideal gas properties at high pressures,the actual stagnation pressure and temperature decay more rapidly than with the ideal-gas assumption.

关键词：存储系统高压氢理想气体状态方程泄漏释放模式理想气体模型计算机程序时间历程