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Structural health monitoring and material safety with multispectral technique: A review

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Journal of Safety Science and Resilience 2022年第1期3卷 48-60页

作者： Xiaoqing huang pei Wang Song Zhang Xiongtao Zhao Yupeng Zhang Department of Engineering Physics Tsinghua UniversityBeijing100084China Institute for Aero Engine Tsinghua UniversityBeijing100084China Innoviation and Research Institute of Hiwing Technology Academy Beijing100084China

Structural health monitoring is the technique which evaluate and analyze materials in the production and service *** this paper,the basic principles and characteristics of terahertz,infrared,visible-multispectral and X-ray nondestructive testing technologies with different penetration rates,spectral energy,detection accuracy and system complexity are *** on the types and causes of defects in aerospace materials,the correspond-ing testing techniques and nondestructive testing technology for different defects are also ***,the image processing technology of each detection technology is *** practice,it is usually necessary to select one or more test methods according to the material properties and damage *** differences in imaging techniques and processing algorithms are the major obstacles to joint multispectral *** there have been preliminary studies on the methods of combining and associating image data under different spectra,further research is needed on how to integrate more spectra for new,more complex applications.

关键词： Structural health monitoring Composite materials Multispectral

Transcatheter arterial chemoembolization combined with CT-guided percutaneous thermal ablation versus hepatectomy in the treatment of hepatocellular carcinoma

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Chinese Journal of Cancer 2015年第6期34卷 29-38页

作者： Sheng Li Liang Zhang Zhi-Mei huang pei-Hong Wu Department of Medical Imaging & Interventional Radiology Sun Yat-sen University Cancer Center State Key Laboratory of Oncology in South China Col aborative Innovation Center for Cancer Medicine

Introduction:Transcatheter arterial chemoembolization(TACE)plus thermal ablation has been widely used recently in the treatment of hepatocellular carcinoma(HCC).In this study,we aimed to compare results of the combination of TACE and percutaneous thermal ablation with those of hepatectomy in patients with ***:The clinical data of 137 HCC patients who sequentially received TACE and computed tomography(CT)-guided percutaneous thermal ablation as an initial curative treatment(combination group)and 148 matched HCC patients who received hepatectomy(surgery group)between 2004 and 2011 were collected and *** TACE,multiphase contrast-enhanced CT was performed to identify the total number of tumors as well as lipiodol deposition in the *** was calculated by using the Kaplan-Meier method and compared by using the log-rank *** prognostic factors were assessed with multivariate Cox proportional hazards regression ***:Of all 285 patients,225(79.0%)had cancerous lesions≤5 cm in *** preoperative contrast-enhanced CT or magnetic resonance imaging,the number of tumors was 1–4 for each *** 1-,3-,and 5-year overall survival rates were 95,74%,and 67%in the combination group and 88,66,and 47%in the surgery group,respectively(P=0.004);the corresponding recurrence-free survival rates for the two groups were 92,69,and 61%and 75,58,and44%,respectively(P=0.001).In the multivariate analysis,treatment allocation was an independent prognostic factor for *** 60 patients in the combination group had sufficient imaging data,and 135 new lesions with lipiodol deposition were diagnosed as malignancies in 22 of 60 patients,whereas 20 new lesions were found in 11 of 148patients in the surgery ***:The combination of TACE and CT-guided percutaneous thermal ablation for HCC improves survival of HCC patients compared with hepatectomy.

关键词：原发性肝癌切除术肝动脉治疗 CT 引导计算机断层扫描肝细胞癌

Synthesis and Characterization of Fluorinated Polyimide Derived from 3,3＇-Diisopropyl-4,4＇-diaminodiphenyl- 3＂,4＂-difluorophenylmethane

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Chinese Journal of Chemistry 2015年第10期33卷 1159-1166页

作者： Xiaohua huang Mei Mei Chanjuan Liu Xianglin pei Chun Wei Key Laboratory of New Processing Technology for Nonferrous Metal & Materials Ministry of Education andSchool of Material Science and Engineering Guilin University of Technology Guilin Guangxi 541004 China Ministry of Education Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources School of Chemistry and Pharmaceutical Science Guangxi Normal University Guilin Guangxi 541004 China

A novel aromatic diamine monomer, 3,3＇-diisopropyl-4,4＇-diaminodiphenyl-3＂,4＂-difluorophenylmethane （PAFM）, was successfully synthesized by coupling of 2-isopropylaniline and 3,4-difluorobenzaldehyde. The aro- matic diamine was adopted to synthesize a series of fluorinated polyimides by polycondensation with various dian- hydrides： pyromellitic dianhydride （PMDA）, 3,3＇,4,4＇-biphenyltetracarboxylic dianhydride （BPDA）, 4,4＇-oxydiph- thalic anhydride （ODPA） and 3,3＇,4,4＇-benzophenone tetracarboxylic dianhydride （BTDA） via the conventional one-step method. These polyimides presented excellent solubility in common organic solvents, such as N,N-dimeth- ylformamide （DMF）, N,N-dimethyl acetamide （DMAc）, dimethyl sulfoxide （DMSO）, N-methyl-2-pyrrolidone （NMP）, chloroform （CHC13）, tetrahydrofuran （THF） and so on. The glass transition temperatures （Tg） of fluorinated polyimides were in the range of 260--306 ℃ and the temperature at 10% weight loss in the range of 474--502 ℃ Their films showed the cut-off wavelengths of 330--361 nm and higher than 80% transparency in a wavelength range of 385--463 nm. Moreover, polymer films exhibited low dielectric properties in the range of 2.76--2.96 at 1 MHz, as well as prominent mechanical properties with tensile strengths of 66.7--97.4 MPa, a tensile modulus of 1.7--2.1 GPa and elongation at break of 7.2%- 12.9%. The polymer films also showed outstanding hydrophobicity with the contact angle in the range of 91.2°--97.9°.

关键词： fluorinated polyimides solubility transparency dielectric constant

Cytological Evaluation and Karyotype Analysis in Plant Germplasms of Elytrigia Desv.

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Agricultural Sciences in China 2010年第11期9卷 1553-1560页

作者： MAO pei-sheng huang Ying WANG Xin-guo MENG Lin MAO pei-cbun ZHANG Guo-fang Forage Seed Laboratory China Agricultural University Beijing 100193 P.R. China Beijing Research and Development Center for Grass and Environment Beijing Academy of Agriculture and Forestry Beijing 100097 P.R.China

Elytrigia Desv. is widely distributed throughout the world and is represented with species of various levels of ploidy including diploids, tetraploids, hexaploids, octaploids, and decaploids. The distribution pattern of these ploidy levels, however, is not well-defined. In this study, the levels of ploidy for 64 accessions of Elytrigia from 25 countries were determined with microscopic procedures. The results showed that accessions of E. intermedia and E. repens were grouped into three distinct levels of ploidy including diploids, tetraploids and hexaploids. For E. elongata, E. pontica, and E. caespitosa, it was found that two ploidy levels presented, and only one ploidy level was in those of E. hybrid, E. pycnantha, E. pungens, E. juncea, and E. alatavica. Karyotype analysis indicated that the karyotype formula of diploid, tetraploid and hexaploid of E. intermedia was 2n = 2x = 14 = 6m ＋ 6sm ＋ 2st, 2n = 4x = 28 = 2M ＋ 10m ＋ 16sm and 2n = 6x = 42 = 4M ＋ 18m ＋ 20sin, respectively. Furthermore, the karyotype formula of three germplasms in tetraploid of E. intermedia was 2n=4x=28 =2M＋ 10m＋ 16sm, 2n=4x=28=4M＋22m （sat）＋2sm and 2n=4x=28 =4M＋ 12m＋ 12sm （sat）, which were not completely uniform. Therefore, it could be suggested that the studies about chromosome constitution would be helpful for the detail understanding of the diversity of germplasm resource in Elytrigia and promoting the utilization in the crop molecular breeding.

关键词： Elytrigia Desv. ploidy evaluation karyotype analysis

Epigenetic regulation in cardiovascular disease:mechanisms and advances in clinical trials

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Signal Transduction and Targeted Therapy 2022年第7期7卷 2368-2395页

作者： Yuncong Shi Huanji Zhang Suli huang Li Yin Feng Wang pei Luo Hui huang The Eighth Affiliated Hospital Sun Yat-sen UniversityNo.3025Shennan Middle RdFutian District518033 ShenzhenChina Shenzhen Center for Disease Control and Prevention 518055 ShenzhenChina State Key Laboratory of Chinese Materia Medica Quality Research Macao University of Science and Technology999078 MacaoChina

Epigenetics is closely related to cardiovascular ***-wide linkage and association analyses and candidate gene approaches illustrate the multigenic complexity of cardiovascular *** epigenetic mechanisms,such as DNA methylation,histone modification,and noncoding RNA,which are of importance for cardiovascular disease development and *** epigenetic key enzymes,especially the DNA methyltransferases,histone methyltransferases,histone acetylases,histone deacetylases and their regulated target genes,could represent an attractive new route for the diagnosis and treatment of cardiovascular ***,we summarize the knowledge on epigenetic history and essential regulatory mechanisms in cardiovascular ***,we discuss the preclinical studies and drugs that are targeted these epigenetic key enzymes for cardiovascular diseases ***,we conclude the clinical trials that are going to target some of these processes.

关键词： cardiovascular clinical diagnosis

Fabrication of flower-like mesoporous TiO_2 hierarchical spheres with ordered stratified structure as an anode for lithium-ion batteries

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Journal of Materials Science & Technology 2019年第4期35卷 667-673页

作者： Yujie Zheng Bingjie Liu pei Cao Hui huang Jing Zhang Guowei Zhou Key Laboratory of Fine Chemicals in Universities of Shandong School of Chemistry and Pharmaceutical EngineeringQilu University of Technology (Shandong Academy of Sciences)

In this study, flower-like mesoporous TiO_2 hierarchical spheres(FMTHSs) with ordered stratified structure and TiO_2 nanoparticles(TNPs) were synthesized via a facile solvothermal route and an etching reaction. Multilamellar vesicles(MTSVs) and unilamellar TiO_2/SiO_2 vesicles(UTSVs) were prepared using cetyltrimethylammonium bromide and didodecyldimethylammonium bromide as structure-directing agents under different solvothermal conditions. FMTHSs and TNPs were obtained from the etching reactions of MTSVs and UTSVs, respectively, in an alkaline system. FMTHSs display flower-like, ordered stratified structures on each petal. The thickness of the ordered stratified structure is approximately3–6 nm, and the number of layers is approximately 2–4. The FMTHSs2 electrode exhibits the first discharge capacity of 212.4 m A h g^(-1) at 0.2 C, which is higher than that of TNPs electrode(167.6 mA h g^(-1)).The discharge specific capacity of FMTHSs2 electrode after 200 cycles at 1 C is 105.9 mA h g^(-1), which is higher than that of TNPs electrode(52.2 mA h g^(-1)) after the same number of cycles. The outstanding performance of FMTHSs2 electrode is attributed to the advantages of FMTHSs. In particular, their own stratified structure can provide additional active sites for reactions. The hierarchical structure can provide short diffusion length for Li^+, large electrolyte–electrode contact area, and superior accommodation of the strain of Li+intercalation/deintercalation.

关键词： Lithium ion batteries Flower-like TiO2 spheres Stratified structure Multialmellar TiO2/SiO2 vesicles Controllable morphology

Nonlinear Optimization of Orthotropic Steel Deck System Based on Response Surface Methodology

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Research 2020年第1期2020卷 28-49页

作者： Wei huang Minshan pei Xiaodong Liu Chuang Yan Ya Wei Intelligent Transportation System Research Center Southeast UniversityNanjing 210096China CCCC Highway Consultants Co. Ltd.Beijing 100084China Department of Civil Engineering Tsinghua UniversityBeijing 100084China

The steel bridge deck system,directly subjected to the vehicle load,is an important component to be considered in the optimization design of the *** to its complex structure,the design parameters are coupled with each other,and many fatigue details in the system result in time-consuming calculation during structure *** view of this,a nonlinear optimization method based on the response surface methodology(RSM)is proposed in this study to simplify the design process and to reduce the amount of calculations during *** optimization design of the steel bridge deck system with two-layer pavement on the top of the steel deck plate is taken as an example,the influence of eight structural parameters is *** Box-Behnken design is used to construct a sample space in which the eight structural parameters can be distributed evenly to reduce the calculation *** finite element method is used to model the mechanical responses of the steel bridge deck *** the regression analysis by the RSM,the explicit relationships between the fatigue details and the design parameters can be obtained,based on which the nonlinear optimization design of the bridge deck system is *** influence of constraint functions,objective functions,and optimization algorithms is also *** method proposed in this study is capable of considering the influence of different structural parameters and different optimization objectives according to the actual needs,which will effectively simplify the optimization design of the steel bridge deck system.

关键词： steel fatigue system

Universal Theory and Basic Rules of Strain-Dependent Doping Behaviors in Semiconductors

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Chinese Physics Letters 2021年第8期38卷 90-95页

作者： Xiaolan Yan pei Li Su-Huai Wei Bing huang Beijing Computational Science Research Center Beijing 100193China Department of Physics Beijing Normal UniversityBeijing 100875China

Enhancing the dopability of semiconductors via strain engineering is critical to improving their functionalities,which is,however,largely hindered by the lack of basic *** this study,for the first time,we develop a universal theory to understand the total energy changes of point defects(or dopants)with different charge states under strains,which can exhibit either parabolic or superlinear behaviors,determined by the size of defect-induced local volume change(ΔV).In general,ΔV increases(decreases)when an electron is added(removed)to(from)the defect ***,in terms of this universal theory,three basic rules can be obtained to further understand or predict the diverse strain-dependent doping behaviors,i.e.,defect formation energies,charge-state transition levels,and Fermi pinning levels,in *** three basic rules could be generally applied to improve the doping performance or overcome the doping bottlenecks in various semiconductors.

关键词： doping defect semiconductors

Novel Non-Coplanar and Tertbutyl-Substituted Polyimides:Solubility,Optical,Thermal and Dielectric Properties

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Chinese Journal of Chemistry 2015年第2期33卷 277-284页

作者： Chanjuan Liu Xianglin pei Xiaohua huang Chun Wei Xiaoyi Sun Key Laboratory of New Processing Technology for Nonferrous Metal&Materials Ministry of Educationand School of Material Science and EngineeringGuilin University of TechnologyGuilinGuangxi 541004China College of Chemistry and Chemical Engineering Central South UniversityChangshaHunan 410083China

A novel aromatic diamine monomer bearing tertbutyl and 4-tertbutylphenyl groups,3,3'-ditertbutyl-4,4'-diaminodiphenyl-4''-tertbutylphenylmethane(TADBP),was prepared and characterized.A series of non-coplanar polyimides(PIs)were synthesized via a conventional one-step polycondensation from TADBP and various aromatic dianhydrides including pyromellitic dianhydride(PMDA),3,3',4,4'-biphenyltetracarboxylic dianhydride(BPDA),4,4'-oxydiphthalic anhydride(OPDA),3,3',4,4'-benzophenone tetracarboxylic dianhydride(BTDA)and 4,4'-(hexafluoroisopropylidene)dipthalic anhydride(6FDA).All PIs exhibit excellent solubility in common organic solvents such as N,N-dimethylformamide(DMF),N,N-dimethylacetamide(DMAc),N-methyl-2-pyrrolidone(NMP),dimethyl sulfoxide(DMSO),chloroform(CHCl3),tetrahydrofuran(THF),and so ***,the obtained transparent,strong and flexible polyimide films present good thermal stability and outstanding optical *** glass transition temperatures(Tgs)are in the range of 298 to 347℃,and 10%weight loss temperatures are in excess of 490℃with more than 53%char yield at 800℃in *** the polyimides can be cast into transparent and flexible films with tensile strength of 80.5-101 MPa,elongation at break of 8.4%-10.5%,and Young's modulus of 2.3-2.8 ***,the PIs show the cutoff wavelengths of 302-356 nm,as well as low moisture absorption(0.30%-0.55%)and low dielectric constant(2.78-3.12 at 1 MHz).

关键词： polyimides tertbutyl group solubility dielectric constant