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Minimally invasive approach for improving aesthetic in a patient with tetracycline-stained teeth by bleaching:A clinical evaluation

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Laparoscopic, Endoscopic and Robotic Surgery 2019年第2期2卷 34-40页

作者： Kunliang Luo Jun he Department of Dental Center Sir Run Run Shaw HospitalZhejiang University School of MedicineHangzhou 310016China

Objective:To compare 16% carbamide peroxide(CP)with a higher concentration of hydrogen peroxide(HP)for bleaching teeth in office or at-home to erase tetracycline stains on *** and methods:In a randomized,self-controlled clinical trial,we assigned eligible subjects to group A with 40% HP compared with 16% CP or group B with 45% CP compared with 16% CP on the split maxillary arch and followed the manufacturers’*** color changes were measured with vita 3D-bleached guide and colorimeter at baseline and three-time *** sensitive intensity was evaluated using numeric rating scales,and oral soft and hard tissue examination was *** satisfaction survey was conducted at the last tooth color ***:There were 20 subjects *** color changes by the end of the study were A1(40% HP)=8.22,A2(16% CP)=8.20,B1(45% CP)=11.27,B2(16% CP)=8.26 *** groups experienced significant shade reductions by bleaching,the 45% CP group had significantly greatest color changes compared with the other groups(p=0.03).For tooth sensitivity evaluation,significant differences were observed in 40% HP group(p=0.01),but with mild *** patients suffered oral soft or hard tissue abnormalities before and after *** were more in favor of using 45% CP according to the questionnaire ***:The 3 whitening agents were effective and safe for the whitening of tetracycline-stained teeth,the 45% CP agent had quicker whitening efficacy with low tooth sensitivity and positive *** significance:45% of high-concentration CP whitener by at-home using,brought faster and superior efficacy to bleaching tetracycline-stained teeth while had the equal intensity of tooth sensitivity.

关键词： Tetracycline Tooth bleaching Tooth bleaching agents Home bleaching In-office bleaching Tooth sensitivity

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Plasma density enhancement in radio-frequency hollow electrode discharge

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Plasma Science and Technology 2024年第4期26卷 44-51页

作者：贺柳良何锋欧阳吉庭 College of Science Beijing University of Civil Engineering and ArchitectureBeijing 102616People’s Republic of China School of Physics Beijing Institute of TechnologyBeijing 100081People’s Republic of China

The plasma density enhancement outside hollow electrodes in capacitively coupled radio-frequency(RF) discharges is investigated by a two-dimensional(2D) particle-in-cell/Monte-Carlo collision(PIC/MCC) model. Results show that plasma exists inside the cavity when the sheath inside the hollow electrode hole is fully collapsed, which is an essential condition for the plasma density enhancement outside hollow electrodes. In addition, the existence of the electron density peak at the orifice is generated via the hollow cathode effect(HCE), which plays an important role in the density enhancement. It is also found that the radial width of bulk plasma at the orifice affects the magnitude of the density enhancement, and narrow radial plasma bulk width at the orifice is not beneficial to obtain high-density plasma outside hollow *** electron density at the orifice, combined with larger radial plasma bulk width at the orifice,causes higher electron density outside hollow electrodes. The results also imply that the HCE strength inside the cavity cannot be determined by the magnitude of the electron density outside hollow electrodes.

关键词： RF capacitively coupled plasma sources plasma density enhancement hollow cathodeeffect hollow electrode

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Paleoenvironment reconstruction of the Middle Ordovician thick carbonate from western Ordos Basin, China

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Petroleum Science 2023年第1期20卷 48-59页

作者： Jia-Qi Yang Jun-Tao Zhang Zhi-Liang he Tao Zhang School of Energy Resources China University of GeosciencesBeijing100083China SINOPEC Exploration and Production Research Institute Beijing100083China China Petrochemical Corporation Ltd. Beijing100728China

Reconstructing paleoenvironments has long been considered a vital component for understanding the development and evolution of carbonate *** Middle Ordovician Period is considered the archetypical greenhouse interval,and also a critical period in biological *** Middle Darriwilian isotope carbon excursion has been observed in many areas of the world and may be related to the biological explosions caused by decreases in the *** thick carbonate rocks in the fifth member of the Middle Ordovician Majiagou Formation in the Dingbei area of the Ordos Basin were chosen as an example,based on the concentration of major,trace and rare earth elements as well as C,O and Sr isotopic analyses,the paleoenvironment was *** its impact on natural gas exploration was *** results show that the seawater paleotemperature was 29℃,suboxicanoxic paleoredox conditions were observed,and the seawater paleosalinity was high.A large number of plankton in the biological explosion caused a rapid increase in the total organic carbon in carbonate rocks,which provided natural gas as supplemental source *** by early meteoric water,the dissolution of gypsum laid the foundation for high-quality reservoirs,and the residual gypsum also further preserved natural *** study provides new data for the paleoenvironment and a theoretical basis for further natural gas exploration.

关键词： Middle darriwilian isotope carbon excursion Paleoenvironment Natural gas exploration Middle ordovician Ordos basin

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Thermodynamic modeling of Fe-C-Mn-Si alloys

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Journal of Iron and Steel Research International 2017年第2期24卷 190-197页

作者： Wei-sen Zheng Xiao-gang Lu Yan-lin he Lin Li School of Materials Science and Engineering Shanghai University Shanghai 200444 China Department of Materials Science and Engineering KTH Royal Institute of Technology Stockholm 10044 Sweden State Key Laboratory of Advanced Special Steel Shanghai University Shanghai 200072 China

The thermodynamic database of the Fe C Mn-Si system has been developed in the framework of the CALPHAD approach. The sub-ternary systems have been carefully evaluated and revised based on available experimental data. A satisfactory description of the liquid phase in the Fe C-Si system has been obtained. The C Mn Si system was assessed treating the liquid phase as a substitutional solution. Phase equilibria in the C- Mn-Si system, especially those involving the liquid phase, can be well described. Based on the extrapolation of the experimental data in the quaternary system, the Fe Mn Si system has been modified to agree well with experimental data at high temperatures. The comparison between the calculated and measured phase transformation tempera tures confirms the reliability of the present quaternary database. Additionally, the solidification process of Fe-0. 16C-1. 5Mn-1. 5Si （wt. %） alloy was simulated by using the thermodynamic database developed.

关键词： Fe-C-Mn-Si alloy Thermodynamic mode CALPHAD Solidification Partial equilibrium

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Functional prediction of tomato PLATZ family members and functional verification of Sl PLATZ17

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Journal of Integrative Agriculture 2024年第1期23卷 141-154页

作者： Min Xu Zhao Gao Dalong Li Chen Zhang Yuqi Zhang Qian he Yingbin Qi he Zhang Jingbin Jiang Xiangyang Xu Tingting Zhao College of Horticulture and Landscape Architecture Northeast Agricultural UniversityHarbin 150030China Key Laboratory of Biology and Genetic Improvement of Horticultural Crops(Northeast Region) Ministry of Agriculture and Rural AffairsHarbin 150030China

PLATZ is a novel zinc finger DNA-binding protein that plays an important role in regulating plant growth and development and resisting abiotic ***,there has been very little research on the function of this family gene in tomatoes,which limits its application in germplasm resource ***,the PLATZ gene family was identified and analyzed in tomato,and its roles were predicted and verified to provide a basis for in-depth research on SlPLATZ gene *** this study,the PLATZ family members of tomato were identified in the whole genome,and 19 SlPLATZ genes were *** prediction was conducted based on gene and promoter structure analysis and RNA-seq-based expression pattern *** genes that responded significantly under different abiotic stresses or were significantly differentially expressed among multiple tissues were screened as functional gene ***17 was selected for functional verification by experiment-based *** results showed that the downregulation of SlPLATZ17 gene expression reduced the drought and salt tolerance of tomato *** plants overexpressing SlPLATZ17 had larger flower sizes and long,thin petals,adjacent petals were not connected at the base,and the stamen circumference was *** study contributes to understanding the functions of the SlPLATZ family in tomato and provides a reference for functional gene screening.

关键词： tomato PLATZ family abiotic stresses plant development

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Synthesis of hierarchical dendritic micro–nano structure ZnFe_2O_4 and photocatalytic activities for water splitting

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Chinese Journal of Chemical Engineering 2016年第8期24卷 1112-1116页

作者： Zhongping Yao Yajun Zhang Yaqiong he Qixing Xia Zhaohua Jiang School of Chemical Engineering and Technology State Key Laboratory of Urban Water Resource and Environment Harbin Institute of Technology

Hierarchical dendritic micro–nano structure Zn Fe_2O_4 have been prepared by electrochemical reduction and thermal oxidation method in this work. X-ray diffractometry, Raman spectra and field-emission scanning electron microscopy were used to characterize the crystal structure, size and morphology. The results show that the sample(S-2) is composed of pure ZnFe_2O_4 when the molar ratio of Zn^(2+)/Fe^(2+)in the electrolyte is 0.35. Decreasing the molar ratio of Zn^(2+)/Fe^(2+), the sample(S-1) is composed of ZnFe_2O_4 and α-Fe_2O_3, whereas increasing the molar ratio of Zn^(2+)/Fe^(2+), the sample(S-3) is composed of ZnFe_2O_4 and Zn O. The lattice parameters of ZnFe_2O_4 are influenced by the molar ratio of Zn^(2+)/Fe: Zn at excess decreases the cell volume whereas Fe at excess increases the cell volume of Zn Fe_2O_4. All the samples have the dendritic structure, of which S-2 has micron-sized lush branches with nano-sized leaves. UV–Vis diffuse reflectance spectra were acquired by a spectrophotometer. The absorption edges gradually blue shift with the increase of the molar ratio of Zn^(2+)/Fe^(2+). Photocatalytic activities for water splitting were investigated under Xe light irradiation in an aqueous olution containing 0.1 mol·L^(-1)Na_2S/0.02 mol·L^(-1)Na_2SO_3 in a glass reactor. The relatively highest photocatalytic activity with 1.41 μmol·h-1· 0.02 g^(-1)was achieved by pure ZnFe_2O_4sample(S-2). The photocatalytic activity of the mixture phase of Zn Fe_2O_4 and α-Fe_2O_3(S-1) is better than ZnF e_2O_4 and ZnO(S-3).

关键词： ZnFe2O4 Electrochemical reduction and thermal oxidation Dendritic micro–nano structure Hydrogen production

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Study and application of crown feedback control in hot strip rolling

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Journal of University of Science and Technology Beijing 2007年第2期14卷 190-194页

作者： Xiaodong Wang Anrui he Quan Yang Zhi Xie Hongtao Yang National Engineering Research Center for Advanced Rolling Technology University of Science and Technology Beijing Beijing 100083 China Anshan Iron and Steel Corporation Anshan 114002 China

Crown feedback control is one part of the automatic shape control （ASC） system. On the basis of large simulation researches conducted, a linear crown feedback control model was put forward and applied in actual strip rolling. According to its successful op- eration in the ASP 1700 hot strip mill of Angang Group for one year and also from the statistical results of several crown measurements, it can be definitely said that this control model is highly effective and shows stable performance. The control effectiveness of different gauges of strips with the feedback control is found to increase by 10%-30% compared with that without feedback control.

关键词： hot rolled strip crown feedback control automatic shape control profiler

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Unregulated emissions from a diesel engine equipped with vanadium-based urea-SCR catalyst

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Journal of Environmental Sciences 2010年第4期22卷 575-581页

作者： Lei Jiang Yunshan Ge Asad Naeem Shah Chao he Zhihua Liu School of Mechanical Engineering Beijing Institute of Technology Beijing 100081 China. Department of Mechanical Engineering University of Engineering and Technology Lahore 54000 Pakistan School of Transportation Machinery and Civil Engineering Southwest Forestry College Kunming 650224 China

The present work is aimed at the study of number-size distribution of particles, volatile organic compounds （VOCs）, and carbonyl compounds （CC） or carbonyls emitted from a 4-cylinder turbocharged diesel engine equipped with a vanadium-based urea selective catalytic reduction catalyst. The engine was run on an electric dynamometer in accordance with the European steady-state cycle. Pollutants were analyzed using an electric low pressure impactor, a gas chromatograph/mass spectrometer, and a high performance liquid chromatography system for the number-size distribution of particles, VOCs, and CC emissions, respectively. Experimental results revealed that total number of particles were decreased, and their number-size distributions were moved from smaller sizes to larger sizes in the presence of the catalyst. The VOCs were greatly reduced downstream of the catalyst. There was a strong correlation between the conversion of styrene and ethyl benzene. The conversion rate of benzene increased with increase of catalyst temperature. Formaldehyde, acetaldehyde, acrolein and acetone were significantly reduced, resulting in a remarkable abatement in carbonyls with the use of the vanadium-based urea-SCR system.

关键词： diesel engine selective catalytic reduction particulate volatile organic compounds carbonyls

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Toward innovative veterinary nanoparticle vaccines

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Animal Diseases 2024年第2期4卷 78-97页

作者： Meiqi Sun Aldryan Cristianto Pratama he Qiu Zehui Liu Fang he Institute of Preventive Veterinary Medicine College of Animal Sciences of Zhejiang University866 Yuhangtang RoadHangzhou 310058China Zhejiang Provincial Key Laboratory of Preventive Veterinary Medicine Hangzhou 310058China ZJU-Xinchang Joint Innovation Centre(TianMu Laboratory) Gaochuang Hi‑Tech ParkXinchang 312500ZhejiangChina Department of Cardiology Cardiovascular Key Lab of Zhejiang ProvinceThe Second Affiliated HospitalZhejiang University School of MedicineZhejiang UniversityHangzhouChina

Nanoparticles are significant for veterinary vaccine development because they are safer and more effective than conventional *** promising area of research involves self-assembled protein nanoparticles(SAPNs),which have shown potential for enhancing antigen-presenting cell uptake,B-cell activation,and lymph node *** nanovaccines have been utilized in veterinary medicine,including natural self-assembled protein nanoparticles,rationally designed self-assembled protein nanoparticles,animal virus-derived nanoparticles,bacteriophagederived nanoparticles,and plant-derived nanoparticles,which will be discussed in this *** vaccines can produce robust cellular and humoral immune responses and have been shown to protect against various animal infectious *** article attempts to summarize these diverse nanovaccine types and their recent research progress in the field of veterinary ***,this paper highlights their disadvantages and methods for improving their immunogenicity.

关键词： Nanoparticles Veterinary vaccine Self-assembling protein nanoparticles(SAPNs) Virus-like nanoparticles(VLPs) Immune responses Animal infectious diseases Optimization strategies

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The choice between bankruptcy liquidation and bankruptcy reorganization: a model and evidence

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Journal of Management Analytics 2018年第3期5卷 170-197页

作者： Kai Yu Dongwei he Department of Operations Management Antai College of Economics&ManagementShanghai Jiao Tong UniversityShanghaiPeople’s Republic of China Department of Economics Antai College of Economics&ManagementShanghai Jiao Tong UniversityShanghaiPeople’s Republic of China

This paper proposes a two-period model to examine which bankruptcy procedure is better for both the debtor and creditor when insolvency *** theoretical model depicts how firm size,industry characteristics,equity structure,and debt structure determine firms’bankruptcy *** a comprehensive sample of bankrupt firms in the United States,we verify the predictions of a theoretical *** our study,we deploy Probit and Logit models to address the predictions in the theoretical framework and conduct a series of robustness checks with econometric methods like Propensity Score Matching to confirm the empirical *** paper finds that firms with larger size have more chance to file for Chapter 11 reorganization when insolvency *** also find that firms in asset-heavy(asset-light)industries are more likely to be reorganized(liquidated)under *** code.

关键词： corporate bankruptcy bankruptcy resolution APR violations liquidation and reorganization

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