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Stability analysis of reference station and compensation for monitoring stations in GNSS landslide monitoring

Satellite Navigation 2023年第3期4卷 107-121页

作者： Duo Wang Guanwen Huang Yuan Du Qin Zhang Zhengwei bai Jing tian College of Geology Engineering and Geomatics Chang’an University126 Yanta RoadXi’an 710054China Key Laboratory of Ecological Geology and Disaster Prevention Ministry of Natural ResourcesXi’an 710054ShannxiChina

The Real-Time Kinematic(RTK)positioning method of the Global Navigation Satellite System(GNSS)has been widely used for landslide *** stability of its reference station is crucial to obtain accurate and reliable monitoring *** reference stations due to the geological environment and human activities are difficult to detect and in practical applications often *** a result,it affects the positioning solutions and subsequently the interpretation and detection of landslide motions,which must be addressed in GNSS landslide *** solve this problem,we propose using the Precise Point Positioning(PPP)technique to analyze the stability of the reference station by verifying its *** deformations of the monitoring stations are then ***,the reference station coordinates are obtained by the PPP technique and tectonic motion is considered in data *** change or breakout of the reference station position is then determined using a cumulative sum control chart ***,each monitoring station’s displacements are compensated according to the displacements of the reference *** to the results of the Tengqing landslide experiment,the PPP technique can be used in GNSS landslide monitoring to analyze the stability of reference *** PPP,millimeter-level accuracy for the coordinates of reference stations is *** to the traditional deformation series,the compensated displacement series more reliably reflects the landslide *** study will increase the reliability of monitoring results and contribute to implementing GNSS in monitoring landslides.

关键词： Global navigation satellite system(GNSS) Reference station Stability analysis Precise point positioning Landslide monitoring

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Austenite Grain Growth in Heat Affected Zone of Zr-Ti Bearing Microalloyed Steel

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Journal of Iron and Steel Research International 2012年第2期19卷 73-78页

作者： ZHENG Lei YUAN ze-xi SONG Shen-hua XI tian-hui WANG Qian Department of Materials Science and Engineering Shenzhen Graduate School Harbin Institute of TechnologyShenzhen 518055 Guangdong China School of Materials and Metallurgy Wuhan University of Science andTechnology Wuhan 430081 Hubei China Research and Development Center Wuhan Iron and SteelCorporation Wuhan 430080 Hubei China

Austenite grain sizes in the heat affected zone （HAZ） of a high heat input welded Zr-Ti bearing microal- loyed steel are measured under different welding conditions simulated by a Gleeble-1500 thermal-mechanical simulator. The austenite grain growth is divided into two regimes in terms of temperature. When the temperature is lower than 1 250℃ where the pinning effect of precipitates is strong, the austenite grain size increases slowly with increas- ing peak temperature, but it increases drastically when the temperature is higher than 1 250 ~C where the pinning effect of precipitates is weak. Based on the experimental measurements, an analytical model for predicting the aus- tenite grain size in the heat affected zone is derived. Model predictions indicate that the initial grain size has little effect on the final one, and the grain growth depends mainly on heat input and peak temperature as well as growth activation energy and exponent. With the use of the model, the width of coarse grained heat affected zone （CGHAZ） for a thick plate is predicted.

关键词： welding high heat input microstructure

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The anti-inflammatory effects of asiatic acid in lipopolysaccharide-stimulated human corneal epithelial cells

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International Journal of Ophthalmology(English edition) 2017年第2期10卷 179-185页

作者： Hao Chen Xiao-Min Hua bai-Chen ze Bin Wang Li Wei Special Medicine Department of Medical College Qingdao UniversityQingdao 266071Shandong ProvinceChina

AIM： To investigate the anti-inflammatory effects of asiatic acid（AA） on lipopolysaccharide（LPS）-induced inflammatory response in human corneal epithelial cells（HCECs）.METHODS： Cell viability was measured using a cell counting kit-8（CCK-8） *** real-time polymerase chain reaction（qR T-PCR） was used to determine the mR NA expression of interleukin-8（IL-8）,interleukin-6（IL-6）,interleukin-1β（IL-1β）,tumor necrosis factor-alpha（TNF-α）,and transforming growth factor-β（TGF-β） in *** reactive oxygen species（ROS） was measured using the ROS assay ***（GSH） concentration was measured using the total GSH assay ***1 and Akt phosphorylation（p-Akt1） levels were measured by Western blotting and ***： AA induced toxicity at high concentrations and significantly stimulated the proliferation of HCECs at concentrations of 20 μmol/L for *** at concentrations of 300 ng/mL for 1h significantly stimulated the mR NA expression of IL-8,IL-6,IL-1β,TNF-α,and TGF-β in HCECs,while the stimulation effects were significantly inhibited by AA（20 μmol/L）.In addition,AA was found to decrease the content of ROS,increase GSH generation,and also inhibit LPS-induced p-Akt in ***： AA decreases the generation of inflammatory factors IL-8,IL-6,IL-1β,TNF-α,and TGF-β in LPSstimulated *** significantly inhibites the intracellular concentrations of ROS and increases GSH *** also inhibites LPS-induced p-Akt in *** findings reveal that AA has anti-inflammation effects in LPS-stimulated HCECs.

关键词： asiatic acid lipopolysaccharide inflammatory factors reactive oxygen species glutathione Akt phosphorylation

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Tribological evaluation of thermoplastic polyurethane-based bearing materials under water lubrication:Effect of load,sliding speed,and temperature

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Friction 2024年第8期12卷 1801-1815页

作者： Shaoli JIANG Janet SSWONG Debashis PUHAN tian YUAN Xiuqin bai Chengqing YUAN State Key Laboratory of Maritime Technology and Safety Wuhan University of TechnologyWuhan 430063China Department of Mechanical Engineering Imperial College LondonLondon SW72AZUK Yusuf Hamied Department of Chemistry University of CambridgeLensfield RoadCambridge CB21EWUK

Polymers are widely used in bearing *** the case of water-lubricated stern tube bearings,thermoplastic polyurethane(TPU)-based composites are used due to their excellent wear resistance,corrosion resistance,and tunable mechanical *** tribological performance,however,depends on operating *** this work,TPU was blended with carbon fiber,graphene platelet,and ultra-high molecular weight polyethylene(UHMWPE).Friction tests of TPU based-composites against copper countersurface were carried out in water to mimic the actual operating conditions of the *** of the resulting contacts were in the boundary lubrication regime,in which friction was attributed to both contact mechanics of asperities as well as water *** results show that the viscoelasticity of TPU has a considerable impact on its tribological *** lubrication at 50°C promotes the softening of polymer surface material during sliding,resulting in higher fluctuation in the coefficient of friction and wear *** is attributed to the reduced thermomechanical *** addition,Schallamach waviness is observed on worn *** tribological properties of TPU are significantly improved by the inclusion of carbon fiber,graphene platelet,and *** formation of graphene transfer-layers and UHMWPE transfer film reduces friction and wear loss,while the inclusion of carbon fiber enhances wear resistance due to improved mechanical properties and load bearing capacity.

关键词： friction thermoplastic polyurethane(TPU) water-lubricated bearings graphene platelet carbon fibers ultra-high molecular weight polyethylene(UHMWPE)

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Microstructure,tensile properties and thermal stability of AlMgSiScZr alloy printed by laser powder bed fusion

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Journal of Materials Science & Technology 2021年第10期69卷 200-211页

作者： Jiang Bi Zhenglong Lei Yanbin Chen Xi Chen ze tian Nannan Lu Xikun Qin Jingwei Liang State Key Laboratory of Advanced Welding and Joining Harbin Institute of TechnologyHarbin 150001China

The new generation of Sc and Zr modified Al alloys has been attracted wide concerns in aerospace industry,owing to the excellent mechanical performances and superior thermal stability than other normal Al *** microalloying with Sc and Zr,the Al3(Sc,Zr)particle forms as the grain refiner during the solidification,which is extremely beneficial for the laser powder bed fusion(LPBF)processed Al *** this study,a new type Al-14.1 Mg-0.47 Si-0.31 Sc-0.17 Zr alloy was additively manufactured by LPBF,and the microstructure,tensile properties and thermal stability were studied in *** using a single melt-67°scanning strategy,the LPBF-processed specimen with a relative density of 99.4%and tensile strength of 487.7 MPa was obtained at 160 W-200 mm/*** this AlMgSiScZr alloy can still exhibit an excellent tensile strength of 393.9 MPa at a moderate temperature of 473 *** the aging treatment,the tensile properties further increased due to the precipitate hardening of Mg2Si and Al3(Sc,Zr),and the maximum value(580 MPa)was reached at an aging time of 10 *** average crystal size was almost unchanged after aging treated at 325℃and 24 h,indicating this AlMgSiScZr alloy has an improved thermal *** AlMgSiScZr alloy is recommended to substitute some particular titanium alloys in aerospace field afterwards.

关键词： Laser powder bed fusion AlMgSiScZr alloy Microstructure Tensile behavior Thermal stability Phase evolution

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Melting and Annealing Peak Temperatures of Poly(butylene succinate) on the Same Hoffman-Weeks Plot Parallel to Tm=Tc Line

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Chinese Journal of Polymer Science 2021年第6期39卷 745-755,I0007页

作者： Zhi-Ning Xie Hai-Mu Ye Tong Chen tian-ze Zheng Jun Xu Bao-Hua Guo Advanced Materials Laboratory Department of Chemical EngineeringTsinghua UniversityBeijing 100084China Departmentof Materials Science and Engineering College of New Energy and MaterialsChina University of PetroleumBeijing 102249China

The crystallization and melting behavior of polymers is of theoretical *** this work,poly(butylene succinate)(PBS)was selected as an example to study such behavior at low supercooling via introduction of the extended-chain crystal(ECC)of the same polymer as nucleating *** crystallization of PBS with its ECC as nucleating agent in a wide temperature range(90–127°C)and the following melting behavior were *** is revealed that the melting point(Tm',for Tc≥113°C)and the annealing peak temperature(Ta',for Tc=90–100°C)show similar asymptotic *** Tm and Ta approach to a value of ca.3.3°C higher than the corresponding Tc when the crystallization time tc approaches the starting *** is to say,the Hoffman-Weeks plot is parallel to Tm=Tc *** crystallization line became parallel to the melting line when PBS was crystallized at Tc higher than 102°*** on these results,we propose that the parallel relationship and the intrinsic similarity between the Ta and the Tm observed at the two ends of the Tc range could be attributed to the metastable crystals formed at the beginning of crystallization.

关键词： Polymer crystallization Melting temperature Hoffman-Weeks plot Stabilization mechanism Baby crystal

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Clinical study on microscopic syndrome differentiation and traditional Chinese medicine treatment for liver stomach disharmony in chronic gastritis

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World Journal of Gastrointestinal Surgery 2024年第5期16卷 1377-1384页

作者： Chun-Yan bai Wei tian Qian Zhang Department of Rehabilitation Medicine Beijing Aerospace General HospitalBeijing 100076China Department of Rehabilitation Medicine People’s Hospital of HengshuiHengshui 053000Hebei ProvinceChina Department of Internal Medicine Hebei Academy of Chinese Medicine SciencesShijiazhuang 050000Hebei ProvinceChina

BACKGROUND Chronic gastritis(CG)is a common gastrointestinal disorder characterized by inflammation of the stomach ***-stomach disharmony(LSD)syndrome is believed to contribute to CG *** To evaluate the efficacy and safety of microcosmic syndrome differentiation and Chinese herbal medicine(CHM)treatment in patients with CG and LSD *** Sixty-four patients with CG and LSD syndrome were randomly divided into two groups:The treatment group received CHM based on microcosmic syndrome differentiation and the control group received conventional Western *** treatment course lasted 12 *** primary outcome was improvement in dyspeptic symptoms,measured using the Nepean Dyspepsia *** secondary outcomes included the improvement rate of endoscopic findings,histopathological findings,and microcosmic syndrome scores and the incidence of adverse *** After 12 wk of treatment,the treatment group showed significantly greater improvement in dyspeptic symptoms than the control group(93.75%vs 65.63%,P0.05).No serious adverse events were observed in either *** Microcosmic syndrome differentiation and CHM treatment can effectively improve dyspeptic symptoms and endoscopic findings in patients with CG and LSD syndrome and have a good safety *** studies with larger sample sizes and longer follow-up periods are required to confirm the long-term efficacy and mechanism of action of this treatment.

关键词： Chronic gastritis Liver-stomach disharmony Microcosmic syndrome differentiation Chinese herbal medicine Randomized controlled trial Microcosmic syndrome scores

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The imaging and dissecting of pBR322 plasmid DNA by AFM

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Chinese Science Bulletin 1997年第13期42卷 1093-1096页

作者： tian, F Li, JW Wang, C bai, CL Institute of Chemistry Chinese Academy of Sciences Beijing 100080 China

THE intra- and intermolecular forces of DNA are essential to understanding its structure andfunctional behavior. However, direct measurement of interaction forces requires that the stateof a system be monitored simultaneously while an independent force is applied. Until now, on-ly X-ray crystallography, light scattering, and nuclear magnetic resonance spectroscopy havebeen used to measure these molecular forces using indirect physical and thermodynamic meth-

关键词： atomic force microscope plasmid DNA probe force.

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Cloning of flavonoid 3’,5’-hydroxylase and 3’-hydroxylase homologs from black currant(Ribes nigrum) and their differential expression at various fruit maturation stages

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Journal of Forestry Research 2019年第2期30卷 463-470页

作者： Xing-guo Li tian-tian Yang ze-yuan Yu Jun-wei Huo Qin Dong Ya-dong Duan Guang Yang College of Horticulture & Landscape Architecture Northeast Agricultural University College of Wildlife Resources Northeast Forestry University Berries Research Institute Heilongjiang Academy of Agricultural Sciences

Flavonoid 3’-hydroxylase(F3’ H) and 3’,5’-hydroxylase(F3’5’ H) generate precursor molecules for the synthesis of cyanidin-based anthocyanins(red) and delphinidin-based anthocyanins(blue to purple) in Ribes nigrum L.(black currant). In this study, full-length 1780 and 165’-bp cDNA homologs of RnF3’5’ H1 and RnF3’ H1 from black currant were identified and cloned using a homologous cloning technique. Data revealed that Rn F3’5’ H1 and RnF3’ H1 are homologs that encode enzymes involved in anthocyanin synthesis from different plants,which phylogenetically cluster with the CYP75 B and CYP75 A families in the P45’ superfamily, *** enzymes encoded by these two genes also shared a high homology with flavonoid hydroxylases identified from other plants. Furthermore, RnF3’5’ H1 and RnF3’ H1 levels were upregulated during fruit maturation. RnF3’5’ H1 levels were associated with both anthocyanin and soluble carbohydrate levels in blackcurrant, while RnF3’ H1 expression did not have such an association. The structure and expression patterns of RnF3’5’ H1 and RnF3’ H1 in blackcurrant were also characterized. Further studies should aid understanding of anthocyanin biosynthesis in black currant to develop molecular approaches and manipulate anthocyanin production in blackcurrant.

关键词： Anthocyanin Flavonoid Gene cloning Expression Blackcurrant

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Intratumoural microorganism can affect the progression of hepatocellular carcinoma

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World Journal of Gastrointestinal Oncology 2024年第10期16卷 4232-4243页

作者： Bao-Qun Liu Yi bai Da-Peng Chen Ya-Min Zhang tian-ze Wang Jing-Rui Chen Xiang-Yu Liu Bin Zheng Zi-Lin Cui First Central Clinical College Tianjin Medical UniversityTianjin 300070China Department of Hepatobiliary Surgery Tianjin First Central HospitalSchool of MedicineNankai UniversityTianjin 300192China tianjin First Central Hospital Clinic Institute School of MedicineNankai UniversityTianjin 300192China School of Medicine Tianjin UniversityTianjin 300072China

BACKGROUND Several recent studies have confirmed that intratumoural microorganisms can affect the occurrence and development of hepatocellular carcinoma(HCC);however,their role in tumor progression remains ***,there is a need for further research on the role of intratumoural microorganisms in *** To investigate the changes in intratumoural microorganisms in HCC and the effect of Propionibacterium on HCC *** HCC and normal liver tissue specimens were subjected to fluorescence in situ hybridization(FISH).After performing 16S rRNA sequencing on HCC and peritumoral tissues to analyze the differences between the two *** was cocultured with HCC cells in *** in cell proliferation and migration capacity were *** expression of NF-κB pathway related proteins in tumor cells was *** orthotopic liver implantation model and the subcutaneous xenograft model were *** tissues and subcutaneous tumors were collected 2 weeks *** FISH demonstrated the presence of microorganisms in HCC and normal liver tissues.16S rRNA sequencing revealed an abundance of Lysobacter,Lachnospiraceae,Pseudomonas,and Lactobacillus in HCC *** distribution and abundance of Propionibacterium showed differences between HCC and peritumoral tissues(P<0.05).In vitro studies demonstrated that Propionibacterium and its metabolite propionic acid(PA)inhibited the proliferation and migration of HCC cells(P<0.05).The expression of the proteins in NF-κB signaling pathway also decreased in HCC cells(P<0.05).CONCLUSION Microorganisms in HCC and normal liver tissues displayed significant *** PA-producing bacterium Propionibacterium in HCC exerts an effect on the NF-κB pathway,thereby affecting the biological behavior of HCC.

关键词： Hepatocellular carcinoma Intratumoural microbiome 16S rRNA sequencing Propionibacterium

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