检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

高糖微环境下的牙周治疗策略

口腔生物医学 2024年第1期15卷 43-48页

作者：向丹丹贺小涛陈发明李璇空军军医大学基础医学院学员队陕西西安710032 口颌系统重建与再生全国重点实验室国家口腔疾病临床医学研究中心陕西省口腔疾病国际联合研究中心第四军医大学口腔医院牙周病科陕西西安710032

糖尿病与牙周炎是由多种复杂因素引起的慢性炎症性疾病,二者联系密切,互为影响因素,均为当今社会亟待解决的重大健康问题。高糖微环境会显著加重牙周病发病率和骨丧失程度,影响牙周组织再生效果,为牙周治疗带来巨大挑战。本篇综述以牙... 详细信息

糖尿病与牙周炎是由多种复杂因素引起的慢性炎症性疾病,二者联系密切,互为影响因素,均为当今社会亟待解决的重大健康问题。高糖微环境会显著加重牙周病发病率和骨丧失程度,影响牙周组织再生效果,为牙周治疗带来巨大挑战。本篇综述以牙周病的发病机制为出发点,分别介绍高糖微环境对上皮细胞、免疫细胞及干细胞等牙周组织细胞的影响,并提出相应的针对性治疗策略,为高糖微环境下的牙周治疗带来新的思路。

关键词：高糖微环境牙周炎免疫细胞干细胞上皮细胞

不同瓶装饮用水水质比较及体外抗氧化能力研究

在线全文

学校读者我要写书评

暂无评论

广东化工 2024年第1期51卷 133-138页

作者：项丹丹项梦丹刘金平尹欣幸许樱子杨晓宾施燕义台州科技职业学院农业与生物工程学院浙江台州318020 台州市园艺生物技术重点实验室浙江台州318020 台州市绿翼环保检测有限公司浙江台州318020

为助力饮用水产业发展提升全民健康,本试验采用感官分析法(综合评分法、百分制法、模糊数学评价法)、理化分析法(火焰原子吸收分光光度法、离子色谱法等)和自由基清除测定法(DPPH法、羟自由基清除法、超氧自由基清除法)对8种不同品牌瓶... 详细信息

为助力饮用水产业发展提升全民健康,本试验采用感官分析法(综合评分法、百分制法、模糊数学评价法)、理化分析法(火焰原子吸收分光光度法、离子色谱法等)和自由基清除测定法(DPPH法、羟自由基清除法、超氧自由基清除法)对8种不同品牌瓶装饮用水进行水质比较和体外抗氧化能力研究。结果显示,8种不同品牌瓶装饮用水均符合国家生活饮用水水质要求,在多种方法的综合测评下,各品牌瓶装饮用水表现出差异性:(1)在三种感官分析法中,农夫山泉天然饮用水均有突出表现,而其他品牌瓶装饮用水则因为外观包装、滋味口感等因素表现略有起伏;(2)通过理化分析法发现,百岁山饮用天然矿泉水、恒大冰泉天然矿泉水和农夫山泉天然饮用水富含钾钙钠镁等矿质元素,长期饮用可能更利于身体健康;(3)根据体外抗氧化能力比较的结果显示,农夫山泉饮用天然水表现出较强的抑制羟自由基能力和抗超氧阴离子能力,具有较强抗氧化活性。

关键词：瓶装饮用水水质分析抗氧化能力模糊数学

CBL+LBL联合教学法在慢阻肺临床教学中的应用研究

在线全文

学校读者我要写书评

暂无评论

中国卫生产业 2024年第3期21卷 158-161,166页

作者：李新鹏项丹丹胡玲玲刘振欣赵向红山东大学齐鲁医院德州医院呼吸与危重症医学科山东德州253014 山东大学齐鲁医院德州医院药剂科山东德州253014

目的创新慢性阻塞性肺疾病(Chronic Obstructive Pulmonary Diseases,COPD)临床教学,在传统教学法(Lecture-based Learning,LBL)基础上使用基于图尔敏模型的案例教学法(Case Study Based Learning,CBL),分析CBL+LBL联合教学法的教学效果。方法选取2022年10月—2023年1月山东大学齐鲁医院德州医院呼吸内科COPD的50名实习医师作为研究对象,采用抛硬币法将其分为传统教学组(n=25)和联合教学组(n=25)。传统教学组采用LBL法,联合教学组在传统教学组的教学基础上采用基于图尔敏模型的CBL教学方法,对比两组理论成绩与综合技能考核评分、教学满意度评分、推理反思能力评分。结果联合教学组理论成绩(91.02±2.00)分、综合技能考核评分(93.23±1.50)分,高于传统教学组的(80.25±1.50)分、(81.20±1.00)分,差异有统计学意义(t=23.595、36.544,P均0.05)。教学后,联合教学组推理反思能力评分显著高于传统教学组,差异具有统计学意义(P<0.05)。结论COPD临床教学理论多,对实习医师的学习能力要求较高。CBL+LBL联合教学法能够提高COPD教学效果,有助于培养实习医师推理反思能力,实习医师教学满意度较高。

关键词：传统教学法案例教学法慢性阻塞性肺疾病图尔敏模型推理反思教学效果

Effects of baffle position in serpentine flow channel on the performance of proton exchange membrane fuel cells

维普期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2024年第5期69卷 250-262页

作者： Guodong Xia Xiaoya Zhang dandan Ma MOE Key Laboratory of Enhanced Heat Transfer and Energy Conservation Beijing Key Laboratory of Heat Transfer and Energy ConversionBeijing University of TechnologyBeijing 100124China

This study used a three-dimensional numerical model of a proton exchange membrane fuel cell with five types of channels:a smooth channel(Case 1);eight rectangular baffles were arranged in the upstream(Case 2),midstream(Case 3),downstream(Case 4),and the entire cathode flow channel(Case 5)to study the effects of baffle position on mass transport,power density,net power,***,the effects of back pressure and humidity on the voltage were *** showed that compared to smooth channels,the oxygen and water transport facilitation at the diffusion layer-channel interface were added 11.53%-20.60%and 7.81%-9.80%at 1.68 A·cm^(-2)by adding *** closer the baffles were to upstream,the higher the total oxygen flux,but the lower the flux uniformity the worse the water *** oxygen flux of upstream baffles was 8.14%higher than that of downstream baffles,but oxygen flux uniformity decreased by 18.96%at 1.68 A·cm^(-2).The order of water removal and voltage improvement was Case 4>Case 5>Case 3>Case 2>Case *** power of Case 4 was 9.87%higher than that of the smooth *** the Case 4,when the cell worked under low back pressure or high humidity,the voltage increments were *** potential increment for the back pressure of 0 atm was 0.9%higher than that of 2 atm(1 atm=101.325 kPa).The potential increment for the humidity of 100%was 7.89%higher than that of 50%.

关键词： Proton exchange membrane fuel cell Baffle position Mass transfer Net power Uniformity Voltage increment

Formation of Superthin Galaxies in IllustrisTNG

在线全文

学校读者我要写书评

暂无评论

Research in Astronomy and Astrophysics 2024年第7期24卷 238-251页

作者： Jianhong Hu dandan Xu Cheng Li Department of Astronomy Tsinghua University

Superthin galaxies are observed to have stellar disks with extremely small minor-to-major axis ratios. In this work,we investigate the formation of superthin galaxies in the TNG100 simulation. We trace the merger history and investigate the evolution of galaxy properties of a selected sample of superthin galaxies and a control sample of galaxies that share the same joint probability distribution in the stellar-mass and color diagram. Through making comparisons between the two galaxy samples, we find that present-day superthin galaxies had similar morphologies as the control sample counterparts at higher redshifts, but have developed extended flat “superthin”morphologies since z ～ 1. During this latter evolution stage, superthin galaxies undergo an overwhelmingly higher frequency of prograde mergers(with orbit-spin angle θorb≤ 40°). Accordingly the spins of their dark matter halos have grown significantly and become noticeably higher than those of their normal disk counterparts. This further results in the buildup of their stellar disks at larger distances much beyond the regimes of normal disk galaxies. We also discuss the formation scenario of those superthin galaxies that live in larger dark matter halos as satellite galaxies therein.

关键词： Galaxies: evolution Galaxies: formation Galaxies: interactions Galaxies: star formation

LFM Radar Source Passive Localization Algorithm Based on Range Migration

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Beijing Institute of Technology 2024年第2期33卷 130-140页

作者： dandan Li Deyi Wang Hao Huan Beijing Key Laboratory of Fractional Signals and Systems School of Information and ElectronicsBeijing Institute of TechnologyBeijing 100081China Beijing Aerospace Automatic Control Institute Beijing 100854China

Traditional single-satellite passive localization algorithms are influenced by frequency and angle measurement accuracies,resulting in error estimation of emitter position on the order of ***,a single-satellite localization algorithm based on passive synthetic aper-ture(PSA)was introduced,enabling high-precision ***,its estimation of azimuth and range distance is considerably affected by the residual frequency offset(RFO)of uncoopera-tive system ***,it requires data containing a satellite flying over the radia-tion source for RFO *** estimating the RFO,an accurate estimation of azimuth and range distance can be carried out,which is difficult to achieve in practical *** LFM radar source passive localization algorithm based on range migration is proposed to address the dif-ficulty in estimating frequency *** algorithm first provides a rough estimate of the pulse repetition time(PRT).It processes intercepted signals through range compression,range interpola-tion,and polynomial fitting to obtain range migration ***,it uses the changing information of range migration and an accurate PRT to formulate a system of nonlinear equations,obtaining the emitter position and a more accurate PRT through a two-step localization *** offset only induces a fixed offset in range migration,which does not affect the changing *** algorithm can also achieve high-precision localization in squint ***,the effectiveness of this algorithm is verified through simulations.

关键词： passive localization range migration residual frequency offset

同方期刊数据库

Separation of La(Ⅲ),Ce(Ⅳ)and Ca(Ⅱ)from bastnaesite using acidic phosphonic chitosan and rotating disk membrane

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2024年第5期42卷 995-1000,I0007页

作者： dandan Lu Wenhui Li Linlin Fan Yunren Qiu School of Chemistry and Chemical Engineering Central South UniversityChangsha410083China

The separation of rare earths is difficult due to their similar properties and the complex characteristics of associated vein o ***-ultrafiltration(CUF)and shear induced o rderly dissociation coupling with ultrafiltration(SIODUF)were used to separate metal ions(M,M=La(Ⅲ),Ce(Ⅳ)and Ca(Ⅱ))from simulated bastnaesite leaching solution using acidic phosphonic chitosan(aPCS)and rotating disk *** of simultaneous removal of metallic ions was investigated by CUF,and suitable conditions were obtained for C/M 10.0(mass ratio of complexant to metal ions)and pH *** shear stabilities of aPCS-M complexes were explored at different pH values and the results show that the complexes can dissociate at a certain rotational speed,the critical *** critical s hear rates of aPCS-La,aPCS-Ce and aPCS-Ca complexes at pH 5.0 were calculated as 1.42×10^(5).1.69×10^(5) and 9.75×10^(4) s^(-1),*** order of complexes shear stability is aPCS-Ca aPCS-La<*** high selective separation of M and regeneration of aPCS were achieved by SIODUF in the light of the difference of aPCSM complexes shear *** separation coefficientsβLa/Ce andβCa/La reach 31.2 and 53.9,respectively.

关键词： Bastnaesite Rare earths Complexation-ultrafiltration Acidic phosphonic chitosan Rotating disk membrane

Shock Initiation Experiments with Modeling on a DNAN Based MeltCast Insensitive Explosive

在线全文

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2024年第2期32卷 655-662页

作者： Feichao Miao dandan Li Yangfan Cheng Junjiong Meng Lin Zhou School of Chemical Engineering Anhui University of Science and TechnologyHuainan 232001China Composite Explosive Research Department Xi'an Modern Chemistry Research InstituteXi'an 710065China State Key Laboratory of Explosion Science and Technology Beijing Institute of TechnologyBeijing 100081China

2,4-dinitroanisole(DNAN)is a good replacement for 2,4,6-trinitrotoluene(TNT)in melt-cast explosives due to its superior *** the increasing use of DNAN-based melt-cast explosives,the prediction of reaction violence and hazard assessment of the explosives subjected to shock is of great *** study investigated the shock initiation characteristics for a DNAN-based melt-cast explosive,DHFA,using the one-dimensional Lagrangian *** embedded manganin gauges in the apparatus record the pressure histories at four Lagrangian positions and show that shock-todetonation transition in DHFA needs a high input shock *** experimental data are analyzed to calibrate the Ignition and Growth *** calibration is performed using an objective function based on both pressure history and the arrival time of *** agreement between experimental and calculated pressure histories indicates the high accuracy of the calibrated parameters with the optimization method.

关键词： 2,4-Dinitroanisole(DNAN) Shock initiation Insensitive explosives Ignition and growth model Equation of state(EOS)

Comparative Study of Genetic Structure and Genetic Diversity betweenWild and Cultivated Populations of Taxus cuspidata,Northeast China

在线全文

学校读者我要写书评

暂无评论

Phyton-International Journal of Experimental Botany 2024年第2期93卷 355-369页

作者： dandan Wang Xiaohong Li Yanwen Zhang School of Science Liaodong UniversityDandong118003China

Taxus cuspidata is a rare plant with important medicinal and ornamental *** at the obvious differences between wild and cultivated populations of *** from Northeast China,a total of 61 samples,that is,33 wild yews and 28 cultivated yews were used to analyze the differences and correlations of the kinship,genetic diversity,and genetic structure between them by specific length amplified fragment sequencing(SLAF-seq).Finally,470725 polymorphic SLAF tags and 58622 valid SNP markers were *** analysis showed that 61 samples were classified into 2 clusters:wild populations and cultivated populations,and some wild yews were categorized into the cultivated populations;the genetic diversity analysis showed that the Nei diversity index of wild populations(0.4068)was smaller than that of cultivated populations(0.4414),and the polymorphic information content(PIC)of wild populations(0.2861)was smaller than that of cultivated populations(0.3309).The genetic differentiation analysis showed that the total populations of gene diversity(H_(t))of cultivated and wild populations were respectively 0.8159 and 0.5685,the coefficient of gene differentiation(G_(st))of cultivated and wild populations was respectively 0.3021 and 0.1068,and the gene flow(N_(m))(2.4967)of wild populations was larger than cultivated populations(0.8199).The molecular variance(AMOVA)revealed that inter-population variation accounted for 29.57%of the total genetic variation,while intra-population variation accounted for 70.42% of the total genetic variation(p<0.001),this suggested that the genetic variation in the *** is mainly attributed to within-population *** conclusion,the genetic distance between geographical ecological groups of wild populations was generally smaller than that of cultivated populations,and the degree of genetic diversity and genetic differentiation was smaller than that of cultivated *** evident,the utilization of SLAF-seq technolog

关键词： T.cuspidata SLAF-seq SNP wild population cultivated population genetic structure