检索结果-南通市图书馆

World Journal of Clinical Cases 2022年第20期10卷 6991-6998页

作者： Dan Tan Shi-Ting Li Hao Feng Zhong-Chao Wang Cai Wen min-hai Nie Luzhou Key Laboratory of Oral and Maxillofacial Reconstruction and Regeneration The Affiliated Stomatological Hospital of Southwest Medical UniversityLuzhou 646000Sichuan ProvinceChina

BACKGROUND A radicular groove is an anatomic malformation that usually initiates at the central fossa,extending along the root at varying lengths and depths and predisposes the involved tooth to a severe periodontal *** grooves that extend to the root apex often lead to complex combined periodontal-endodontic *** are a serious challenge for doctors to diagnose and *** SUMMARY In this report,we described a patient with a maxillary lateral incisor with a deep palatogingival groove with two roots,which led to complex combined periodontal-endodontic *** treatment modalities included curettage of the affected tissues,elimination of the groove by grinding and/or sealing with a variety of filling materials,and surgical *** this case,a combination of endodontic therapy,intentional replantation,and root resection were used,which resulted in periodontal/periradicular healing after 12 *** Intentional replantation and root resection offer a predictable procedure and should be considered a viable treatment modality for the management of palatogingival grooves,especially for two-rooted teeth.

关键词： Intentional replantation Radicular groove Endo-perio lesion Root resection Case report

Multiparameter Numerical Investigation of Two Types of Moving Interactions Between the Deep-Sea mining Vehicle Track Plate and Seabed Soil:Digging and Rotating Motions

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Ocean Engineering 2024年第3期38卷 408-423页

作者： SUN Peng-fei LYU hai-ning YANG Jian-min XU Zhi-yong State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200240China Yazhou Bay Institute of Deepsea SCI-TECH Shanghai Jiao Tong UniversitySanya 572024China Institute of Marine Equipment Shanghai Jiao Tong UniversityShanghai 200240China

To ensure the safe performance of deep-sea mining vehicles(DSMVs),it is necessary to study the mechanical characteristics of the interaction between the seabed soil and the track *** rotation and digging motions of the track plate are important links in the contact between the driving mechanism of the DSMV and seabed *** this study,a numerical simulation is conducted using the coupled Eulerian–Lagrangian(CEL)large deformation numerical method to investigate the interaction between the track plate of the DSMV and the seabed soil under two working conditions:rotating condition and digging ***,a soil numerical model is established based on the elastoplastic mechanical characterization using the basic physical and mechanical properties of the seabed soil obtained by in situ ***,the soil disturbance mechanism and the dynamic mechanical response of the track plate under rotating and digging conditions are obtained through the analysis of the sensitivity of the motion parameters,the grouser structure,the layered soil features and the soil *** results indicate that the above parameters remarkably influence the interaction between the DSMV and the seabed ***,it is important to consider the rotating and digging motion of the DSMV in practical engineering to develop a detailed optimization design of the track plate.

关键词： deep-sea mining vehicle rotating motion digging motion track plate-seabed soil interaction CEL numerical method

The Relationship between Magnetic Gradient and Magnetic Shear in Five Super Active Regions Producing Great Flares

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Astronomy and Astrophysics 2006年第4期6卷 477-488页

作者： hai-min Wang Hui Song Ju Jing Vasyl Yurchyshyn Yuan-Yong Deng Hong-Qi Zhang David Falconer Jing Li National Astronomical Observatories Chinese Academy of Sciences Beijing 100012 Big Bear Solar Observatory New Jersey Institute of Technology Big Bear City CA 92314 USA Marshall Space Flight Center SD50 Huntsville AL 35812 USA Institute for Astronomy University of Hawaii 2680 Woodlawn Drive Honolulu HI 96822 USA

We study the magnetic structure of five well-known active regions that produced great flares （X5 or larger）. The six flares under investigation are the X12 flare on 1991 June 9 in AR 6659, the X5.7 flare on 2000 July 14 in AR 9077, the X5.6 flare on 2001 April 6 in AR 9415, the X5.3 flare on 2001 August 25 in AR 9591, the X17 flare on 2003 October 28 and the X10 flare on 2003 October 29, both in AR 10486. The last five events had corresponding LASCO observations and were all associated with Halo CMEs. We analyzed vector magnetograms from Big Bear Solar Observatory, Huairou Solar Observing Station, Marshall Space Flight Center and Mees Solar Observatory. In particular, we studied the magnetic gradient derived from line-of-sight magnetograms and magnetic shear derived from vector magnetograms, and found an apparent correlation between these two parameters at a level of about 90%. We found that the magnetic gradient could be a better proxy than the shear for predicting where a major flare might occur： all six flares occurred in neutral lines with maximum gradient. The mean gradient of the flaring neutral lines ranges from 0.14 to 0.50 G km^-1, 2.3 to 8 times the average value for all the neutral lines in the active regions. If we use magnetic shear as the proxy, the flaring neutral line in at least one, possibly two, of the six events would be mis-identified.

关键词： Sun: activity -- Sun: flares -- Sun: magnetic fields -- Sun: coronal mass ejections (CMEs)

A Statistical Study of Rapid Sunspot Structure Change Associated with Flares

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Astronomy and Astrophysics 2007年第5期7卷 733-742页

作者： Wei-Zhong Chen Chang Liu Hui Song Na Deng Chang-Yi Tan hai-min Wang Center for Solar-Terrestrial Research New Jersey Institute of Technology University Heights Newark N J 07102-1982 USA

We reported recently some rapid changes of sunspot structure in white-light （WL） associated with major flares. We extend the study to smaller events and present here results of a statistical study of this phenomenon. In total, we investigate 403 events from 1998 May 9 to 2004 July 17, including 40 X-class, 174 M-class, and 189 C-class flares. By monitoring the structure of the flaring active regions using the WL observations from the Transition Region and Coronal Explorer （TRACE）, we find that segments in the outer sunspot structure decayed rapidly right after many flares; and that, on the other hand, the central part of sunspots near the flare-associated magnetic neutral line became darkened. These rapid and permanent changes are evidenced in the time profiles of WL mean intensity and are not likely resulted from the flare emissions. Our study further shows that the outer sunspot structure decay as well as the central structure darkening are more likely to be detected in larger solar flares. For X-class flares, over 40% events show distinct sunspot structure change. For M- and C-class flares, this percentage drops to 17% and 10%, respectively. The results of this statistical study support our previously proposed reconnection picture, i.e., the flare-related magnetic fields evolve from a highly inclined to a more vertical configuration.

关键词： Sun activity -- Sun flares -- Sun magnetic fields -- sunspots

Surface decoration of mesocarbon microbeads with multifunctional TiNbO_(4-x)@C coating layer as high rate and stable anode of Li-ion batteries

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第5期43卷 2053-2066页

作者： Jia-Mei Lai Zhi-min Zou Yu Bai Yu-Tao Xing Chun-hai Jiang Fujian Provincial Key Laboratory of Functional Materials and Applications Institute of Advanced Energy MaterialsSchool of Materials Science and EngineeringXiamen University of TechnologyXiamen 361024China Shanghai XFH Science and Technology Development Co. Ltd.Shanghai 200949China Fujian XFH New Energy Materials Co. Ltd.Yong'an 366000China Shenzhen XFH Science and Technology Co. Ltd.Shenzhen 518071China Laboratorio de Microscopia Eletronica de Alta Resolucao Centro de Caracterizagao Avangada Para a Industria de Petroleo(LaMAR/CAIPE)Universidade Federal FluminenseNiteroiRJ 24210-346Brazil

Surface modification of graphite anode with electroactive matters has been proven of a more practical strategy in enhancing the performance of Li-ion batteries than exploring alternative novel anode ***,rutile TiNbO_(4-x) nanoparticles with a tunnel structure are employed as multifunctional decoration substances in combination with a carbon coating layer to improve the rate and cycle properties of mesocarbon microbeads(MCMBs).As compared to pristine MCMB,the Li^(+)diffusion coefficients of the composite anodes are enhanced due to the synergistic effect of TiNbO_(4-x)@***,the overcharge and voltage polarization of the composite anodes at high rate are obviously minimized due to the current sharing effect of the high-potential TiNbO_(4-x).Moreover,the amorphous Li_(y)TiNbO_(4-x) converted from TiNbO_(4-x) in the initial lithiation process can deliver pseudocapacitive capacity to the composite anodes from the second *** of these functions of TiNbO_(4-x)@Ccoating layer have directly contributed to the improved rate and cycle performance of the MCMB/TiNbO_(4-x)@C composite *** one containing 12.0 wt%TiNbO_(4-x) exhibits a high reversible specific capacity of 118 m Ah·g^(-1)at 10C(1C=372 m A·g^(-1)),together with a high capacity retention of 90.9%after 300 cycles at 3C,which are all much superior to those of pristine MCMB.

关键词： Li-ion batteries MCMB TiNbO_(4-x)@C Surface decoration Rate capability

耕地土壤地球化学元素富集与风化淋溶特征分析——以杭州市为例

在线全文

学校读者我要写书评

暂无评论

环境生态学 2024年第9期6卷 8-16页

作者：俞伯汀管敏琳王其春孔海民解怀生郑基滋林钟扬杭州市规划和自然资源局浙江杭州310026 杭州市土地储备交易中心杭州市地质环境监测中心浙江杭州310026 中化地质矿山总局浙江地质勘查院浙江杭州310002 浙江省耕地质量与肥料管理总站浙江杭州310020 浙江省地质院浙江杭州310007

对杭州市1∶25万多目标区域地球化学调查采集的4162件表层(0~20 cm)土壤样品与1038件深层(20~150 cm)土壤样品,以及杭州市县级耕地范围内1∶5万土地质量地质调查采集的25561件表层(0~20 cm)土壤样品,所获得的约80万条地球化学参数,采用S... 详细信息

对杭州市1∶25万多目标区域地球化学调查采集的4162件表层(0~20 cm)土壤样品与1038件深层(20~150 cm)土壤样品,以及杭州市县级耕地范围内1∶5万土地质量地质调查采集的25561件表层(0~20 cm)土壤样品,所获得的约80万条地球化学参数,采用SPSS软件进行数据统计分析,开展杭州市耕地土壤地球化学元素富集与风化淋溶特征研究,探讨各项耕地土壤地球化学元素组合特征所反映的地质意义。结果表明,杭州市土壤溴(Br)、汞(Hg)、镉(Cd)、硒(Se)、硫(S)、氮(N)等元素富集系数(P_(i)值)为2~3,处于中富集水平,而总碳(TC)、有机碳(Org.C)等元素为强富集水平。杭州市土壤风化淋溶系数(ba值)均值为0.37,极大值为1.39,极小值为0.15,变异系数为0.39,属弱-中等变异程度,揭示土壤中各元素在区域分布上相对较为均匀,土壤风化淋溶系数(ba值)高值区主要分布于萧山-临平一带平原区,低值区主要分布于富阳-桐庐-建德-淳安一带的低山丘陵区,总体与区内的母岩母质类型、地形地貌及人类耕种条件相关,反映为平原区第四系松散沉积物区和碳酸岩地层区土壤风化淋溶系数(ba值)较高,风化淋溶程度较弱,而低山丘陵区碎屑岩地层区风化淋溶系数(ba值)较低,风化淋溶程度较强,旱地耕作区低于水田耕作区的特点。

关键词：耕地土壤地球化学元素富集风化淋溶特征杭州

Superhydrophobic Fe-based amorphous coating fabricated by detonation spraying with excellent anti-corrosion and self-cleaning properties

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2023年第2期42卷 629-644页

作者： Shuai Cui hai-min Zhai Wen-Sheng Li Wei Tong Xiao-Song Li An-Hui Cai Xiang-Juan Fan Xu-Qiang Li Dang-Sheng Xiong School of Materials Science and Engineering Nanjing University of Science and TechnologyNanjing210094China State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metals Lanzhou University of TechnologyLanzhou730050China Hunan Provincial Key Laboratory of Electromagnetic Equipment Design and Manufacturing Hunan Institute of Science and TechnologyYueyang414000China

Amorphous alloys without crystalline defects(dislocation,crystal boundary)are ideal hydrophobic coating materials due to their low surface *** work used a synergistic method of detonation spraying and surface modification to obtain the superhydrophobic Febased amorphous coatings with high hardness and dense structure on the Q 235 *** results showed that the water contact angles(WCA)of the superhydrophobic coating was 160°±3.6°,and water droplets could bounce off the superhydrophobic coating surface,illustrating the excellent self-cleaning performance of ***,the corrosion current density(i_(corr))of the superhydrophobic coating further decreased by 2 orders of magnitude down to8.008×10^(-8)A·cm^(-2)compared to the as-deposited coating with 5.473×10^(-6)A·cm^(-2);the corrosion potential(E_(corr))of the superhydrophobic coating shifted by 34 mV to the positive side compared with that of the as-deposited coating(-310 mV).Likewise,the impedance modulus|Z|values of the superhydrophobic coating increased by nearly2 orders of magnitude up to 1×10^(5.6)compared to the asdeposited coating with 1×10^(3.8).Even through lasting immersion in NaCl for 10 days,|Z|values of the superhydrophobic coating were still much higher than those of the as-deposited *** superhydrophobic Fe-based amorphous coatings could respond to their applications under extreme conditions due to their excellent hydrophobicity and self-cleaning properties,illustrating their promising future in aerospace,automotive,and machinery industries.

关键词： Fe-based amorphous coating Detonation spraying Superhydrophobic Corrosion resistance Self-cleaning

在线全文

学校读者我要写书评

暂无评论

浙江农田土壤化学计量特征与有效铬预测模型

江西农业学报 2024年第9期36卷 42-51页

作者：孔海民林宝义任海英季天委郭东梅王先挺陆若辉李岗浙江省农业科学院农产品质量安全和营养研究所/园艺研究所浙江杭州310021 浙江省耕地质量与肥料管理总站浙江杭州310020 宁波市鄞州区农业技术推广站浙江宁波315100

为作物生产提供基础土壤信息,以2008—2018年浙江地区典型农田为研究对象,采集、处理、贮存和检测了3726个土壤样本,每个样本包括pH值等14个理化指标,用R软件的基于加权最小二乘法原理的多元线性回归对数据进行分析。结果表明:(1)浙江... 详细信息

为作物生产提供基础土壤信息,以2008—2018年浙江地区典型农田为研究对象,采集、处理、贮存和检测了3726个土壤样本,每个样本包括pH值等14个理化指标,用R软件的基于加权最小二乘法原理的多元线性回归对数据进行分析。结果表明:(1)浙江地区典型农田土壤,pH值的算术平均值为5.820,79.6%土壤样本的pH值介于4.500~6.500之间;90.8%土壤样本的有机质(oM)含量为0~50 g/kg;84.0%以上土壤样本全氮(tN)、速效氮(aN)、有效磷(aP)和速效钾(aK)的含量分别为0~4 g/kg、0~300 mg/kg、0~50 mg/kg和0~150 mg/kg;77.8%土壤样本缓效钾(saK)的含量为50~450 mg/kg;91.8%以上土壤样本的Cu、Zn、B、Mo和Cr含量分别为0~40、0~100、0~2、0~10和0~100 mg/kg;87.8%土壤样本的Mn含量为0~80 mg/kg;87.8%土壤样本的Fe含量为0~400 mg/kg。(2)有效态Cr含量与saK、Cu、aK、pH、Mn、Zn、B、Mo、oM、tN和aN等指标显著相关,可用稳健回归方程表示为:yCr=-130.0+64.6xCu+50.6xpH+451.0xB-12.6xCu×pH-75.6xCu×B-84.9xpH×B-15.6xMn×B+13.8xCu×pH×B。总之,浙江地区典型农田土壤偏酸性,大部分土壤(79.1%)oM含量为20~50 g/kg,适合作物生长;土壤中N、Cr、K含量变异中等,变异系数为30%~90%;土壤中P、Fe、Mn、Cu、Zn、B、Mo的含量变化较大,变异系数均大于1;有效Cr含量与saK、Cu等11种土壤组分呈显著相关,可以用稳健回归方程定量描述。

关键词：土壤营养土壤理化指标检测重金属

Cloning One CIPK Gene from a Thermo-Sensitive Genic Self-Incompatible Line in Maize Expressing Under Different Temperatures

在线全文

学校读者我要写书评

暂无评论

Agricultural Sciences in China 2011年第6期10卷 813-819页

作者： LIN Xing-e JI Hong-qing NIU Jun-hai HU Yan-min FU Zhong-jun LIU Zong-hua TANG Ji-hua College of Agronomy Henan Agricultural University Zhengzhou 450002 P.R.China

A calcineurin B-like protein-interacting protein kinases （CIPK） gene was cloned （EU 424058） from a thermo-sensitive genic self-incompatibility （TSGI） line, HE97, in maize, which was selected for suppression subtractive hybridization （SSH） library of the self-incompatible and self-compatible silks of the TSGI line under different temperatures. The full-length cDNA of the candidate CIPK-like gene consisted of 1 918 nucleotides and contained a 1 332-bp open reading frame in maize. Real-time PCR indicated that the candidate CIPK-like gene was highly expressed in the self-incompatible pollen of the TGSI line, and promoted elevated levels of calcium （Ca2＋）. High Ca2＋ concentrations in the pollen strongly inhibit pollen tube formation in silk of the same plant, thus inducing self-incompatibility （SI） under high temperature. These results implied that the CIPKs-like gene would play an important role in the regulation of HE97 characteristics under different temperatures, perhaps acting as a secondary messenger in the expression of SI in the TGSI line in maize.

关键词： CIPK gene cloning expression temperature maize

Variations in Laboratory-Scale Actinomycete Communities Exposed to Cadmium as Assessed by Denaturing Gradient Gel Electrophoresis Profiles

在线全文

学校读者我要写书评

暂无评论

Pedosphere 2010年第2期20卷 174-184页

作者： YUAN hai-Ping,min Hang 2,LIU Ji,YAN Bo and L Zhen-Mei College of Life Science,Zhejiang University,Hangzhou 310058 (China) College of Life Science Zhejiang University Hangzhou 310058 (China)

The actinomycete populations and functions in cadmium （Cd） contaminated soil were investigated by the cultivation- independent molecular methods. The genomic DNA was extracted and purified from soil adulterated with various con- centrations of Cd in the laboratory. The partial 16S rDNA genes were amplified by polymerase chain reaction （PCR） using specific primers bound to evolutionarily conserved regions within these actinomycete genes. The diversity in PCR- amplified products, as measured by denaturing gradient gel electrophoresis （EGGE）, was used as a genetic fingerprint of the population. Principle component analysis and Shannon-Weaver diversity index （H） analyses were used to analyze the DGGE results. Results showed that the two principal components accounted for only a low level of the total variance. The value H in contaminated soil was lower than that in the control at later stages of cultivation, whereas at earlier stages it was higher. Among the six sampling time points, the first, fifth and sixth weeks had the highest values of H. Significantly negative correlations between bioavallable Cd concentration and H values existed in the samples from weeks 2 （R = 0.929, P 〈 0.05） and 4 （R = 0.909, P 〈 0.05）. These results may shed light on the effect of Cd on the soil environment and the chemical behavior and toxicity of Cd to actinomycetes.

关键词： denaturing gradient gel electrophoresis genes principal component analysis Shannon-Weaver diversity index