检索结果-南通市图书馆

Polyhydroxybutyrate/Hydroxyapatite Highly Porous Scaffold for Small Bone Defects Replacement in the Nonload-bearing Parts

引用

Journal of Bionic Engineering 2017年第4期14卷 648-658页

作者： Fedor Senatov natalia Anisimova Mikhail Kiselevskiy Aleksey Kopylov Viktor Tcherdyntsev Aleksey Maksimkin National University of Science and Technology MISIS Leninskiy pr. 4 Moscow 119049 Russian Federation N.N. Blokhin Russian Cancer Research Center Kashirskoye sh. 23 Moscow 115478 Russian Federation

In the present work, Polyhydroxybutyrate （PHB）/Hydroxyapatite （HA） porous composites （10%, 20%, 30 %, 40%, 50% weight HA） were obtained by sintering. PHB/20% HA optimally combines satisfactory mechanical properties with a high content of the bioactive component （HA）. Porous PHB/20% HA scaffolds have shown high mechanical properties （compressive strength of 106 MPa and Young＇s modulus of 901 MPa）. A high volume fraction of interconnected pores （〉 50 vol.%） was achieved with pore size of 50 grn - 500 gm. Biocompatibility of porous pure PHB and PHB/20%HA, as its osseointegration were assessed in vitro and after implantation in laboratory animals. PHB/20% HA （-5% ＋ 0.9%） and pure PHB ~3% ~ 1.4%） samples after 24 hours of incubation with human leucocytes showed no significant level of cytotoxicity when p = 0.648 （p-value）. In vitro massive adhesion of mouse Multipotent Mesenchymal Stromal Cells （MMSC） to the surface of both porous samples was shown. PHB/20% HA induced more intensive MMSC proliferation compared to pure PHB, which are 31% ＋ 6.1% and 20% ＋ 5.7 % respectively when p = 0.039. We observed the resorption （implant surface area was reduced by 49 %） and integration of the porous PHB/20% HA samples into surrounding tissues after 30 days of implantation. The signs of osteoclasts accumulation, neo-angigenesis and new bone formation were observed, which make PHB/20% HA promising for bone tissue engineering.

关键词： polyhydroxybutyrate hydroxyapatite scaffold porous structure implant bone regeneration

来源：

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

A Comparative Study of Nanai/Hezhen Cognates in China and Russia

A Comparative Study of Nanai/Hezhen Cognates in China and Ru...

引用

作者： Kurashova natalia 黑龙江大学

学位级别：硕士

The problems of the Nanai language attracts not only linguists' attention, but also local officials who are connected with some practical activities such as creation of schools for Nanai children and classes in governmental schools for teaching in Nanai. There is enough general information in Russian and Chinese linguistics about culture, traditions, language and dialects of Nanai people. But we found out the absence of some special scientific researches in the field of comparing the language and culture of two dialects of the same tribe Nanai and Hezhen. This fact induced us to research the language of Hezhen, compare it with literary Nanai and find out the phonetic differences between them, state the changes that took place in the language vocabulary due to different territories, culture and the influence of national languages, Russian and Chinese in particular. In the work we took up the different layers of Nanai and Hezhen such as sounds, vocabulary and the borrowings that were made in different periods from Russian and Chinese.This work is based on the materials and knowledge that we got here in China. We consider our work to be more practical then theoretical (though the theory of the problem is given in this work both from the point of view of Russian and Chinese scholars) as the Nanai vocabulary has been studied thoroughly and all the examples are given in comparison in Nanai, Hezhen, English, Russian, and Chinese. While analyzing the words all the peculiarities of the word meanings were accounted. When we were in the process of writing this paper, we faced the problem of realities of the Nanai language, i.e. the words that describe the things existing only in Nanai culture, such as the words denoting articles of clothing, kitchen utensils or Nanai cuisine. We do not completely agree with the translations of those words given by Chinese scholars, so in our work we also tried to give full explanation of those realities. In our work, we try to

关键词： comparison Nanai and Hezhen languages dialect sounds vocabulary sound changes bilingual environment

来源：

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

Facile synthesis of nanosized sodium magnesium hydride,NaMgH3

引用

Progress in Natural Science:Materials International 2013年第3期23卷 343-350页

作者： Hazel Reardon natalia Mazur Duncan H.Gregory WestCHEM School of ChemistryJoseph Black BuildingUniversity of GlasgowGlasgow G12 8QQ ScotlandUK Department of Materials Science and Engineering Norwegian University of Science and TechnologyN-7491 TrondheimNorway

The ternary magnesium hydride NaMgH 3 has been synthesised via reactive milling *** method employed neither a reactive H2 atmosphere nor high pressure sintering or other post-treatment *** formation of the ternary hydride was studied as a function of milling time and ball:powder *** purity NaMgH 3 powder(orthorhombic space group Pnma,a 5.437(2),b 7.705(5),c 5.477(2) ;Z 4) was prepared in 5 h at high ball:powder ratios and characterised by powder X-ray diffraction(PXD),Raman spectroscopy and scanning electron microscopy/energy dispersive X-ray spectroscopy(SEM/EDX).The products formed sub-micron scale(typically 200-400 nm in size) crystallites that were approximately isotropic in *** dehydrogenation behaviour of the ternary hydride was investigated by temperature programmed desorption(TPD).The nanostructured hydride releases hydrogen in two steps with an onset temperature for the first step of 513 K.

关键词： Hydride Mechanochemistry Structure Hydrogen storage Raman

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Photoluminescence and energy transfer in transparent glass-ceramics based on GdF3:RE3+（RE=Tb,Eu）nanocrystals

引用

Journal of Rare Earths 2019年第11期37卷 1137-1144页

作者： natalia Pawlik Barbara Szpikowska-Sroka Ewa Pietrasik Tomasz Goryczka Wojciech A.Pisarski Institute of Chemistry University of Silesia9 Szkolna StreetKatowice 40-007Poland Institute of Materials Science University of Silesia75 Putku Piechoty 1A StreetChorzow 41-500Poland

In the present work,the transparent oxyfluoride glass-ceramic samples containing GdF3:RE^3+(RE=Tb,Eu)nanocrystals(nGCs)were fabricated via controlled heat-treatment of precursor xerogels prepared using a sol-gel *** formation of GdF3 nanocrystalline phase from gadolinium(III)trifluoroacetate was verified based on XRD *** average crystal sizes calculated from Scherrer formula were estimated to^10 nm as well as^6 nm for Tb^3+-and Eu^3+-doped samples,*** optical behavior of prepared sol-gel samples was evaluated based on photoluminescence excitation(PLE)and emission spectra(PL)as well as luminescence decay *** samples exhibit the 5D4→7FJ(J=6-3,Tb3+)and the 5D0→7FJ(J=0-4,Eu3+)emission bands recorded within the visible spectral area under excitation at near-UV(393 nm(Eu^3+),351,369,378 nm(Tb^3+))as well as middle-UV illumination(273 nm(Gd3+)).Additionally,based on recorded decay curves,the luminescence lifetimes(τm)for the 5D4(Tb^3+)and the 5D0(Eu3+)excited states were also *** general,recorded luminescence spectra and double-exponential character of decay curves for nGCs indicate a successful migration of Tb^3+and Eu^3+dopant ions from amorphous silicate framework to lowphonon energy GdF3 nanocrystal phase.

关键词： Sol-gel method GdF3 nanocrystals Terbium Europium Rare earths

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Research on the Integration of Enterprise Information Systems in Aircraft Industry

Research on the Integration of Enterprise Information System...

引用

作者： natalia Goretckaia 上海交通大学

学位级别：硕士

将信息技术引入高技术产品全生命周期管理过程,特别是在飞机行业,能够提高产品竞争力和企业管理效率。只有当形成一个组织措施体系,为产品生命周期的所有参与者提供有效的信息流时,引进信息技术的有效性才有可能实现。企业的高质量信息... 详细信息

将信息技术引入高技术产品全生命周期管理过程,特别是在飞机行业,能够提高产品竞争力和企业管理效率。只有当形成一个组织措施体系,为产品生命周期的所有参与者提供有效的信息流时,引进信息技术的有效性才有可能实现。企业的高质量信息流能够为其财务、经济和生产活动提供支持。通过实施集成信息技术,为产品生命周期的所有参与者提供一套相互关联的解决方案,并有可能将PDM和ERP系统结合起来,组织一个单一的集成管理系统,从而确保快速、高质量的信息流。企业管理信息系统的集成能够覆盖整个企业,从技术人员、操作员到高级管理人员,提高生产能力,并显著改善生产参与者与其工作系统之间的数据流。这有助于提高信息传输的速度,避免错误和数据的重新输入,确保透明信息的可用性和并行工作的能力。因此,降低了生产成本,提高了产品质量,并加快了资金周转。本文分析了飞机制造企业的业务流程,描述了流程的信息模型,在此基础上提出了通过集成信息管理系统,构建了可应用于产品全生命周期的企业综合信息系统模型。本文提出了一种解决企业管理中异构信息系统集成问题的方法,并描述了它们之间的信息流。该方法将产品开发和生产周期合并为一个单一的双向业务流程,显著缩短预生产时间,提高生产参与者之间交互的效率。通过对某飞机公司生产过程的研究,证明了快速、高质量信息流的重要性,分析了企业建立集成信息系统的要求,提出了建立集成信息系统的方法和步骤,并给出了一个实例用户界面,把不同的信息管理系统集成在一起。因此,在航空企业使用集成化的企业管理信息系统,将为研发和生产过程提供快速、互联、可靠的运行保障,同时提高管理效率,缩短设计和生产准备时间,提高企业经济收益。

关键词：信息流信息管理系统集成业务流程生产

来源：

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

Problem statement on the vessel braking within ice channel

引用

Transportation Safety and Environment 2021年第1期3卷 50-56页

作者： Vadim K.Goncharov natalia Yu.Klementieva Saint-Petersburg State Marine Technical University 3Lotsmanskaya str.Saint Petersburg190121Russia Krylov State Research Centre 44Moskovskoe shosseSaint Petersburg196158Russia

Sailing within the ice channel that assisting icebreaker tracks is usual for difficult ice conditions in the Northern freezing seas and the Arctic *** is the danger of emergency,namely,the collision with an icebreaker or the ahead vessel,when ones stop before insuperable ice obstacle or because the engine *** paper contents analysis of the vessel braking process and formulation of the equation that gives possibility modelling this process and evaluating the distance that is necessary for safe stopping of vessel in dependence on its characteristics and ice *** of investigation will be applicable for the caravan of cargo vessels forming while the icebreaker assistance.

关键词： cargo vessel ice navigation icebreaker assistance ice channel collision braking

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Parameterization of the propeller thrust for modelling ship braking in ice channel behind icebreaker

引用

Transportation Safety and Environment 2023年第1期5卷 41-48页

作者： Vadim K.Goncharov natalia Yu.Klementieva Saint-Petersburg State Marine Technical University Saint-Petersburg190121Russia Krylov State Research Centre Ice Basin LaboratorySaint-Petersburg196158Russia.

Cargo ship sailing within the ice channel that an assisting icebreaker tracks in the compact ice cover is the usual navigation practice for difficult ice conditions in freezing seas and Arcticwater *** the icebreaker or an ahead vessel stops before the insuperable ice obstacle or because of engine trouble,the danger of an emergency appears,namely of collision with the icebreaker or the ahead ship,if the interval between them is not sufficient for effective braking and *** paper presents the equation that describes the ship braking process within an ice channel and includes the thrust of the propeller that works under the reverse *** specific of this regime is the following:the ship continues the motion‘forwards’and the propeller rotates‘backwards’.An analytical method for description of the ship propeller work on the reverse regime is absent because of the detached flow on its *** paper describes the developed empirical method of this regime parameterization on the basis of serial models of propeller *** outcomes of this investigation are applied to a ship braking process simulation and the evaluation of the safe interval between the ship and the icebreaker.

关键词： ship braking ice channel propeller action curve advance thrust reverse regime

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Cell signaling mechanisms and metabolic regulation of germination and dormancy in barley seeds

引用

The Crop Journal 2017年第6期5卷 459-477页

作者： Zhenguo Ma natalia V.Bykova Abir U.Igamberdiev Department of Biology Memorial University of Newfoundland Pacific Forestry Centre Natural Resources Canada Morden Research and Development Centre Agriculture and Agri-Food Canada

During germination of barley(Hordeum vulgare L.) seeds, important morphological and physiological changes take place, including development of organs and tissues and activation of metabolic pathways. Germination and dormancy of seeds are regulated by abscisic acid, gibberellins, reactive oxygen species(ROS), reactive nitrogen species(RNS)and several other factors. Activities of ascorbate-glutathione cycle enzymes, responsible for scavenging ROS, strongly increase. Catalase and superoxide dismutase activities, also scavenging ROS, decrease at the onset of seed germination and then increase. With the increase in aerobic metabolism after radicle protrusion, the activities of the fermentation enzymes lactate and alcohol dehydrogenase decline rapidly. The RNS-scavenging activity of S-nitrosoglutathione reductase decreases in the course of seed germination, in concert with elevation of nitric oxide production and protein nitrosylation. This activity supports the role of RNS in regulating seed germination. Transcription of various genes at different phases of seed germination exhibits phase-specific changes. During imbibition, genes involved in cell wall metabolism are highly expressed; in the middle phase of seed germination before radicle protrusion, genes involved in amino acid synthesis, protein synthesis, and transport and nucleic acid synthesis are upregulated significantly, and after radicle protrusion, genes involved in photosynthetic metabolism are induced. In summary, signal transduction and metabolic regulation of seed germination involve diverse reactions and complex regulation at different levels of metabolic organization.

关键词： Seed germination Reactive oxygen species Reactive nitrogen species Signal transduction Gene expression

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Polarization effect in tip-enhanced infrared nanospect- roscopy studies of the selective Y5 receptor antagonist Lu AA33810

引用

Nano Research 2018年第8期11卷 4401-4411页

作者： natalia Piergies Ewa Pinta Czestawa Paluszkiewicz Helena Domin Wojciech M.Kwiatek Institute of Nuclear Physics Polish Academy of Sciences PL-31342 Krakow Poland Institute of Pharmacology Polish Academy of Sciences Department of Neurobiology 31-343 Krakow Smetna Street 12 Poland natalia Piergies and Ewa Pieta contributed equally to this work.

A novel approach of combining conventional infrared spectroscopy （IR） and atomic force microscopy （AFM） is presented to better understand the behavior of a drug adsorbed on a metal substrate at the nanoscale level. Tip-enhanced infrared nanospectroscopy （TEIRA） was used for the first time to investigate Lu AA33810, a selective brain-penetrating Y5 receptor antagonist, after immobilization on gold nanopartides （GNPs）. Here, a gold coated AFM tip and gold substrate were used to obtain the near-field electromagnetic field trapping effect. Because of the huge signal enhancement, it was possible to obtain the spectral information regarding the self-assembled monolayer of the investigated molecule. The effect of two orthogonal polarizations （p- and s-polarization modulations） of the excitation laser beam on the spectral patterns is also discussed. The results show that there is a strong relationship between the state of polarization of the incident radiation and the relative infrared band intensities. Another factor affecting the observed spectral differences is the topology of the metal substrate, which may result in the induction of a cross-polarization effect. The performed analysis indicates that the C--C bond from the cyclohexyl group is oriented almost parallel to the metal surface. Conversely, the p- and s-polarized spectral variations suggest that the O=S---O angle is high enough to enable the simultaneous interaction of both oxygen atoms with the GNPs.

关键词： tip-enhanced infrared nanospectroscopy polarization modulation Y5 receptor antagonist gold nanoparticles adsorption

来源：

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

Shungite as the natural pantry of nanoscale reduced graphene oxide

引用

International Journal of Smart and Nano Materials 2014年第1期5卷 1-16页

作者： Elena F.Sheka natalia N.Rozhkova General Physics Department Peoples’Friendship University of RussiaMoscow 117198Russian Federation Institute of Geology Karelian Research Centre RASPetrozavodskRussian Federation

Shungite is presented as a natural carbon allotrope of a multilevel fractal structure that is formed by a successive aggregation of~1 nm reduced graphene oxide *** stacks of the sheets of~1.5 nm in thickness and globular composition of the stacks of~6 nm in size determine the secondary and tertiary levels of the *** of globules of tens of nanometers complete the *** theory of graphene oxide,supported by large experience gained by the modern graphene science,has led to the foundation of the suggested *** microscopic view has found a definite confirmation when analyzing the available empirical appearance of *** our knowledge,this is the first time a geological process is described at quantum level.

关键词： shungite reduced graphene oxide molecular theory

来源：

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

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：