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Search Results: 1 - 10 of 108325 matches for " 周进鑫 "
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Cubic Vertex-Transitive Graphs of Order 4p
4p阶3度点传递图

ZHOU Jinxin,

系统科学与数学 , 2008,
Abstract: A graph is said to be vertex-transitive, if its automorphism group is transitive on its vertices. In this paper, it is proven that a connected cubic vertex-transitive graph of order 4p (p a prime) is either a Cayley graph or isomorphic to one of the following: the generalized Petersen graph P(10,2), the Dodecahedron, the Coxeter graph, or the generalized Petersen graph P(2p,k) where k^2\equiv -1(\mod 2p).
水分和铅胁迫对土壤酶活性的影响
芙蓉,,杨楠,张青
草地学报 , 2013, DOI: 10.11733/j.issn.1007-0435.2013.03.011
Abstract: 针对西北旱区铅锌矿业废弃地林、草植被恢复以及重金属铅污染土壤的植物修复问题,以杨凌塿土土壤为研究对象,通过模拟方法分析水分和铅单一及双重胁迫对土壤脲酶、蔗糖酶、碱性磷酸酶活性的影响。结果表明一定程度的水分胁迫对土壤酶具有激活作用,蔗糖酶对土壤含水量变化最为敏感;蔗糖酶在低铅浓度时被激活、高浓度时被抑制,脲酶和碱性磷酸酶随铅浓度增加保持持续下降趋势。当铅浓度为2000mg·kg-1时,3种酶的最大抑制率分别为56.31%,53.21%和38.11%。水分和铅浓度之间存在交互作用,轻微水分胁迫下,水分和铅双重胁迫对土壤脲酶活性表现出拮抗作用;低浓度铅对土壤蔗糖酶表现出协同作用,铅浓度大于1000mg·kg-1时表现出拮抗作用;对土壤碱性磷酸酶仅在300mg·kg-1时表现出协同作用。轻度水分胁迫和铅对土壤脲酶和蔗糖酶主要表现为协同作用,对碱性磷酸酶主要表现为拮抗作用;重度水分胁迫下,碱性磷酸酶净变化量(ΔU)仅在铅浓度为2000mg·kg-1时小于0,脲酶和蔗糖酶的ΔU规律不明显。水分与铅交互作用下,各种酶最大ΔU分别为对照的88.4%,50.7%和25.5%。
低强度脉冲超声在牙周组织再生中的作用
Effects of low-intensity pulsed ultrasound in periodontal tissue regeneration

李紫嫣,,,李磊
- , 2016, DOI: 10.7518/gjkq.2016.03.017
Abstract: 摘要: 牙周病、根面龋以及颌面先天畸形和创伤等都会不同程度地导致牙槽骨、牙龈和牙周膜等牙周支持组织缺损。低强度脉冲超声(LIPUS)的温热效应和机械刺激可促进成骨质细胞、成牙本质细胞和牙周膜细胞(PDLC)的生成和分化。PDLC可分化成中胚层细胞谱系,进而生成牙槽骨、牙骨质和牙周膜等牙周组织。碱性磷酸酶(AKP)和骨钙蛋白(OCN)为骨形成或骨分化的晚期标志物,经LIPUS刺激过的PDLC,其AKP活性和OCN的表达皆提高。经LIPUS刺激可减少正畸过程中牙根的吸收,促进修复牙根缺损的成牙骨质细胞的增殖分化和矿化,促进牙周组织伤口愈合和血管生成的结缔组织生长因子的表达,从而加速牙周软组织的愈合。LIPUS刺激在牙周支持组织再生中为一种安全无创的治疗手段,但其最佳刺激强度和治疗时间尚需继续探索。
Abstract: Periodontal disease, root caries, maxillofacial deformity, and trauma will cause defects in periodontal supporting tissue, such as alveolar bone, gingiva, and periodontium. Low-intensity pulsed ultrasound(LIPUS) can generate hyperthermia and mechanical stimulation, which can promote the generation and differentiation of cementoblast, odontoblast, and periodontal ligament cell(PDLC). PDLC can differentiate into mesodermal lineages and subsequently generate alveolar bone, cementum, and periodontium. Alkaline phosphatase(AKP) and osteocalcin(OCN) are the advanced markers of osteogenesis and osteogenic differentiation. LIPUS-stimulated PDLC shows improved AKP activity and OCN expression. LIPUS can also decrease the root absorption during orthodontic treatment; accelerate the proliferation, differentiation, and mineralization of cementoblast, which can repair root defects; and improve the expression of connective tissue growth factor that can accelerate angiogenesis and healing of periodontal tissue. LIPUS, as a safe and non-invasive treatment, can be applied in periodontal tissue regeneration. However, further research should be conducted to determine the most suitable stimulation intensity and treatment time.
中图分类号
ON THE NORMALITY OF DIRECTED CAYLEY GRAPHS OF ABELIAN GROUPS
关于交换群上的Cayley有向图的正规性

Xu Mingyao,Zhang Qinhai,Zhou Jinxin,
徐明曜
,张勤海,

系统科学与数学 , 2005,
Abstract: A direced Cayley graph $X=\cay(G, S)$ is called normal for $G$ if the right representation $R(G)$ of $G$ is normal in the full automorphism group $\Aut (X)$. In this paper, we determine all non-normal directed Cayley graphs of finite abelian groups with valencies 2 and 3. Using the result, we give a complete classification of connected directed arc-transitive graphs of order $p^n$ ($n\leq 2, p$ an odd prime) with valency at most 3.
硫酸盐还原菌及其代谢物的接触作用影响石膏分解的实验研究
,跃飞,陈天虎,岳正波,
矿物岩石 , 2015,
Abstract: 采用透析的方法,研究了硫酸盐还原菌(SRB)及不同分子量(0~200、200~2000、2000~10000)代谢产物与石膏接触时对其还原分解的影响。实验结果表明,SRB代谢产生了更多的碱性物质,导致体系pH值明显上升;随着SRB及其代谢产物与石膏的接触作用逐渐增强,石膏的还原分解能力逐渐提高;SRB及其代谢产物可以诱导形成具有良好结晶形态的方解石和无定形态碳酸盐沉淀;代谢产物除可促进石膏还原分解外,一定条件下也可抑制石膏溶解。研究结果表明,SRB及其代谢物与石膏的接触作用对其还原分解有一定的影响,影响机制主要为络合作用和营造pH值、HCO3-浓度不同于溶液的SRB-石膏界面微环境。
好氧活性污泥中自养硝化细菌分离方法研究
,陈梅娟,,岳溪,刘鸿亮
环境工程学报 , 2010,
Abstract: 分别采用琼脂平板、琼脂糖平板、水洗洋菜平板和硅胶平板分离培养城市污水处理厂好氧活性污泥中的硝化细菌。在相同的培养条件下,琼脂平板和水洗洋菜平板有杂菌生长;硅胶平板制作过程繁琐,培养后期出现失水性干裂;琼脂糖平板没有杂菌生长。通过对分离菌株的表观形态观察和NorB基因检测鉴定分离菌株,证明琼脂糖分离出了目的菌株,适合生长周期长的自养硝化细菌分离培养。
骨种植钉前牵引对骨性Ⅲ类错患者软硬组织侧貌的影响
孟耀,,,邓凯雄,刘曼,
华西口腔医学杂志 , 2012, DOI: 10.3969/j.issn.1000-1182.2012.03.014
Abstract: 目的研究采用骨种植钉前牵引对骨性Ⅲ类错患者软、硬组织侧貌的改变。方法选取18例需行前牵引矫治的生长发育期骨性Ⅲ类错患者,采用双侧上颌颧牙槽嵴植入骨种植钉配合面框式前牵引,平均治疗时间为9个月,力值为(3.5±0.1)N。治疗前后头影测量采用Legan&Burstone软组织分析法以及相关硬组织测量,分析比较患者治疗前后软、硬组织变化情况。结果所有患者Ⅲ类错均得到改善,鼻底趋于丰满,颏部顺时针旋转,侧貌由凹面型变为直面型,下唇突度减小,软组织上下面高比、鼻唇角、上唇突度及颏唇沟深度无明显变化。上前牙无明显变化,下前牙舌倾,上颌骨向前生长,A点前移,SNA、ANB增大;SNB减小,下颌骨顺时针旋转。结论骨种植钉前牵引可促进上颌生长,使面中份丰满,且对上颌前牙轴倾度无影响,从而纠正骨性Ⅲ类错。
济阳拗陷东营凹陷盐岩中的烃类包裹体及其地质意义
陈勇,振柱,高永,,高婷,陈中红
地质论评 , 2014,
Abstract: 本文报道在东营凹陷盐岩中发现大量烃类包裹体,这证实盐岩曾经失去封闭能力,成为油气运移通道。在对其盐水包裹体进行均一温度测试时发现,由于捕获压力与实验环境压力差异很大,再加上岩盐在水中溶解度随温度升高而增大,导致测温过程盐水包裹体体积变化和拉伸效应明显,所以同期盐水包裹体的均一温度出现较大波动,结果也不可靠,而纯烃类包裹体在一定程度上可以避免溶解度变化的影响,其均一温度有一定指示意义。通过对岩盐中的烃类包裹体均一温度初步校正,结合埋藏史和热史分析,认为至少存在两期与盐岩层变形有关的烃类流体活动,活动时期分别在东营期和明化镇期。流体对岩盐颗粒滑动和盐岩层变形有极其重要的影响,重结晶的岩盐晶体及其中的流体包裹体是流体作用的直接证据。盐岩中的流体来源、运移方向、活动期次和流体作用下的盐岩变形温度和压力是需要解决的关键问题,这对于了解含油气盆地中盐岩层对油气成藏的控制作用有重要意义。
对流自组装2维胶体晶体成膜趋势和覆盖率
,,信达,张继成,蒋晓东,吴卫东,唐永建
强激光与粒子束 , 2012,
Abstract: ?从自组装理论出发,分析对流自组装2维胶体晶体中空白、条纹区域出现的机理,并在实验上予以验证。通过研究得知,2维胶体晶体的自组装过程呈现空白、条纹、大面积单层、双层条纹的趋势。从胶体晶体覆盖率的角度出发研究2维胶体晶体的组装参数与质量之间的关系,结果表明:胶体晶体的总覆盖率与基片提拉速度倒数呈线性正比,和粒子体积分数呈反比例函数关系;受到多种因素的影响,大面积2维胶体晶体总是伴随着一定比例的空白区域和双层区域出现,提拉法所能获得的最大单层覆盖率为95%。
第三代生物医用材料在口腔领域中的应用
Application of third-generation biomedical materials in dentistry

,,李紫嫣,陈文川
- , 2016, DOI: 10.7518/gjkq.2016.03.013
Abstract: 摘要: 生物医用材料是指以医疗为目的,用于修复或替换人体组织器官或增进其功能的材料。医学尤其是口腔医学的发展史是与医用材料的发展密切相关的,随着材料科学、生命科学和临床医学的不断发展,生物医用材料的研究也取得了很大的进步。新一代(第三代)生物医用材料因其良好的生物活性及生物降解性,在口腔医学领域得到了广泛应用,如骨组织工程支架材料、促进牙周组织再生的生物膜、运载药物的缓释载体等。本文就生物医用材料的发展历程以及第三代生物医用材料在口腔领域的应用研究进展作一综述,旨在使读者能够简单了解第三代生物医用材料的基本知识,并在此基础上为其在口腔医学领域的选择、应用提供参考。
Abstract: Biomedical materials are special functional materials used to replace and repair diseased, damaged, or aging tissues. The histories of medicine, especially dentistry, are closely related to the development of medical materials. With the development of materials science, life science, and clinical medicine, research about biomedical materials has made great progress. New generation(third-generation) biomedical materials, such as bone tissue engineering scaffold, biofilm for periodontal regeneration, drug controlled-release carrier, etc., are widely used in the field of oral medicine because of their good biocompatibility and biodegradability. In this review, the development of biomedical materials and the research progress of the third-generation biomedical materials in dentistry are discussed. This review aims to help readers understand third-generation biomedical materials and to provide a reference for the application and selection of them in dentistry.
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