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Special blocks of Finite Groups

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Acta Mathematica Sinica,English Series 2016年第1期32卷 115-123页

作者： Ji Ping ZHANG Beijing International Center for Mathematical Research Lmam School of Mathematical SciencesPeking University

We first determine in this paper the structure of the generalized Fitting subgroup F＊（G） of the finite groups G all of whose defect groups （of blocks） are conjugate under the automorphism group Aut（G） to either a Sylow p-subgroup or a fixed p-subgroup of G. Then we prove that if a finite group L acts transitively on the set of its proper Sylow p-intersections, then either L/Op（L） has a T.I. Sylow p-subgroup or p = 2 and the normal closure of a Sylow 2-subgroup of L/O2（L） is 2-nilpotent with completely descripted structure. This solves a long-open problem. We also obtain some generalizations of the classic results by Isaacs and Passman on half-transitivity.

关键词： Finite groups representations blocks defect groups

维普期刊数据库

Electric field-driven building blocks for introducing multiple gradients to hydrogels

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Protein & Cell 2020年第4期11卷 267-285页

作者： Gang Xu Zhaozhao Ding Qiang Lu Xiaoyi Zhang Xiaozhong Zhou Liying Xiao Guozhong Lu David L K aplan Department of Orthopedics The Second Affiliated Hospital of Soochow UniversitySuzhou 215000China Department of Bums and Plastic Surgery Engineering Research Center of the Ministry of Education for Wound Repair TechnologyThe Affiliated Hospital of Jiangnan UniversityWuxi 214041China National Engineering Laboratory for Modern Silk&Collaborative Innovation Center of Suzhou Nano Science and Technology Soochow UniversitySuzhou 215123China Department of Orthopedics Affiliated Hospital of Xuzhou Medical UniversityLianyungang 222061China Department of Biomedical Engineering Tufts UniversityMedfordMA 02155USA

Gradient biomaterials are considered as preferable matrices for tissue engineering due to better simulation of native *** introduction of gradient cues usually needs special equipment and complex process but is only effective to limited *** of multiple gradients in the hydrogels remains ***,betasheet rich silk nanofibers(BSNF)were used as building blocks to introduce multiple gradients into different hydrogel systems through the joint action of crosslinking and electric *** blocks migrated to the anode along the electric field and gradually stagnated due to the solution-hydrogel transition of the systems,finally achieving gradient distribution of the blocks in the formed *** gradient distribution of the blocks could be tuned easily through changing different factors such as solution viscosity,which resulted in highly tunable gradient of mechanical *** blocks were also aligned under the electric field,endowing orientation gradient *** cargos could be loaded on the blocks and form gradient cues through the same crosslinking-electric field *** building blocks could be introduced to various hydrogels such as Gelatin and NIPAM,indicating the *** niches with multiple gradient cues could be achieved through the ***-based hydrogels with suitable mechanical gradients were fabricated to control the osteogenesis and ***-osteogenic gradient transition was obtained,which stimulated the ectopic osteochondral tissue regeneration in *** versatility and highly controllability of the strategy as well as multifunction of the building blocks reveal the applicability in complex tissue engineering and various interfacial tissues.

关键词： silk building blocks gradients hydrogel tissue regeneration

The western boundary of extrusion blocks in the southeastern Tibetan Plateau

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Chinese Science Bulletin 2000年第10期45卷 876-881页

作者： JI Jianqing ZHONG Dalai SANG Haiqing ZHANG Liansheng Department of Geology Peking UniversityBeijing 100871China Institute of Geology and Geophysics Chinese Academy of SciencesBeijing 100029China

The model about block extrusion related to collision between Eurasia and India which is proposed by Tapponnier et al. has not been accepted so far in the field. Based on kinematics and chronology, the Gailigong dextral strike-slip fault in west Yunnan and Nabang dextral strike-slip fault which is the part of Mogok belt are the western boundary of extrusion blocks, as the eastern boundary Red River-Ailaoshan left-lateral fault. And more studies show that as the important way for absorbing the convergence between two continents, the age of blocks’ multistage extrusion is about 23 and 13 Ma.

关键词： western boundary of extrusion blocks Cenozoic dextral strike-slip fault deformation age southwest Yunnan.

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On Indecomposable Triple Systems Without Repeated blocks

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数学进展 1989年第3期 375-377页

作者：沈灏 Shanghai Jiaotong University

A λ-fold triple system TS(ν,λ)is an ordered pair(V,B)where V is a setof v elements and B is a collection of 3-subsets(called blocks or triples)of Vsuch that each 2-subset of V is contained in exactly λ triples.A ... 详细信息

关键词： triple Triple contained blocks collection exactly blocks repeated subset otherwise

Decomposition in blocks at the level of wavelet coefficients and T(1) theorem on Hardy space

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2002年第1期3卷 95-100页

作者：杨奇祥 Department of MathematicsWuhan UniversityWuhanChina

This paper deals with the establishment of \%T(1)\% theorem on Hardy space \%H 1\% under condition of weak regularity. An operator or a function is identified on the basis of their wavelet coefficients which are regrouped on some blocks. The actions of each block operator (pseudo\|annular operator) on each block function (atom) are exactly analyzed to establish \%T(1)\% theorem on Hardy space.

关键词： hardy space wavelet coefficients blocks

Assembly of multicomp on ent structures from hundreds of micron-scale building blocks using optical tweezers

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Microsystems & Nanoengineering 2021年第3期7卷 163-171页

作者： Jeffrey E.Melzer Euan McLeod Wyant College of Optical Sciences The University of ArizonaTucsonArizona85721USA

The fabrication of three-dimensional(3D)microscale structures is critical for many applications,including strong and lightweight material development,medical device fabrication,microrobotics,and photonic *** 3D microfabrication has seen progress over the past decades,complex multicomponent integration with small or hierarchical feature sizes is still a *** this study,an optical positioning and linking(OPAL)platform based on optical tweezers is used to precisely fabricate 3D microstructures from two types of micron-scale building blocks linked by biochemical interactions.A computer-controlled interface with rapid on-the-fly automated recalibration routines main tains accuracy eve n after placi ng many buildi ng *** achieves a 60-nm positional accuracy by optimizing the molecular functionalization and laser power.A two-component structure consisting of 4481-pm building blocks is assembled,representing the largest number of building blocks used to date in 3D optical tweezer *** optical tweezers have previously been used for microfabrication,those results were generally restricted to single-material structures composed of a relatively small number of larger-sized building blocks,with little discussion of critical process *** is anticipated that OPAL will enable the assembly,augmentation,and repair of microstructures composed of specialty micro/nanomaterial building blocks to be used in new photonic,microfluidic,and biomedical devices.

关键词： hundreds blocks sized

Portland Cement-Residues-Polymers Composites and Its Application to the Hollow blocks Manufacturing

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Open Journal of Composite Materials 2013年第1期3卷 1-6页

作者： Augusto Cesare Stancato Antonio Ludovico Beraldo State University of Campinas Program in Agricultural Engineering (FEAGRI) Cidade Universitária Zeferino Vaz Campinas Brasil State University of Campinas-FEAGRI Cidade Universitária Zeferino Vaz Campinas Brasil

Agricultural wastes and sawdust combined with cement matrix in the manufacture of building elements has been practiced with success in developed countries. In this study, sawdust from wood species (Pinus caribaea and Eucalyptus grandis) and an agricultural waste—rice husk (Oriza sativa) were combined with Portland cement type V (high initial strength), modified by polymer styrene-butadiene (SBR) addition. Hollow blocks produced with Eucalyptus grandis and rice husk residues showed better compressive strength;however, those produced with residues derived from Pinus caribaea presented non-satisfactory results, due to the particle size that was used.

关键词： Composites Cement Residues Hollow blocks Ultrasonic Pulse Velocity (UPV)

An Experimental Study on the Use of Fonio Straw and Shea Butter Residue for Improving the Thermophysical and Mechanical Properties of Compressed Earth blocks

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Journal of Minerals and Materials Characterization and Engineering 2020年第3期8卷 107-132页

作者： Etienne Malbila Simon Delvoie David Toguyeni Shady Attia Luc Courard Laboratory of Thermal and Renewable Energy (LETRE) University Joseph KI-ZERBO Ouagadougou Burkina Faso Laboratory of Physics and Chemistry of the Environment (LPCE) University Joseph KI-ZERBO Ouagadougou Burkina Faso Laboratory of Building Materials (LMC) University of Liège Liège Belgium Sustainable Building Design Lab (SDB Lab) University of Liège Liège Belgium

The efficient use of building materials is one of the responses to increasing urbanization and building energy consumption. Soil as a building material has been used for several thousand years due to its availability and its usual properties improving and stabilization techniques used. Thus, fonio straws and shea butter residues are incorporated into tow soil matrix. The objective of this study is to develop a construction eco-material by recycling agricultural and biopolymer by-products in compressed earth blocks (CEB) stabilization and analyze these by-products’ influence on CEB usual properties. To do this, compressed stabilized earth blocks (CSEB) composed of clay and varying proportion (3% to 10%) of fonio straw and shea butter residue incorporated were subjected to thermophysical, flexural, compressive, and durability tests. The results obtained show that the addition of fonio straw and shea butter residues as stabilizers improves compressed stabilized earth blocks thermophysical and mechanical performance and durability. Two different clay materials were studied. Indeed, for these CEB incorporating 3% fonio straw and 3% - 10% shea butter residue, the average compressive strength and three-point bending strength values after 28 days old are respectively 3.478 MPa and 1.062 MPa. In terms of CSEB thermal properties, the average thermal conductivity is 0.549 W/m·K with 3% fonio straw and from 0.667 to 0.798 W/m. K is with 3% - 10% shea butter residue and the average thermal diffusivity is 1.665.10-7 m2/s with 3% FF and 2.24.10-7 m2/s with 3.055.10-7 m2/s with 3% - 10% shea butter residue, while the average specific heat mass is between 1.508 and 1.584 kJ/kg·K. In addition, the shea butter residue incorporated at 3% - 10% improves CSEB water repellency, with capillary coefficient values between 31 and 68 [g/m2·s]1/2 and a contact angle between 43.63°C and 86.4°C. Analysis of the results shows that, it is possible to use these CSEB for single-storey housing constru

关键词： Fonio Straw Shea Butter Residue Stabilization Compressed Stabilized Earth blocks Thermophysical and Mechanical Properties

Introducing BIM to Construction Management Students:A Case Study of Using Lego blocks as Instructional Tool

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Journal of Civil Engineering and Architecture 2020年第2期14卷 100-108页

As the construction industry is transitioning into the building information modeling(BIM)era,many construction management(CM)programs are actively integrating BIM into their *** new CM students who are unfamiliar with the BIM concept,a connection is desired to link 2D drawings with 3D *** paper presents a case study that uses Lego blocks as an innovative instructional tool to introduce BIM to new CM *** approach employs a physical Lego model house as the connection between the 2D and 3D worlds in an introductory BIM course and aims to demonstrate the benefits of BIM over 2D CAD through a hands-on *** students are instructed to build a Lego house first with a set of typical 2D construction drawings,including plan,elevation,and section sheets,and then with a 3D model in a BIM *** are guided to navigate the model and then use it as a 3D reference to complete the Lego *** the hands-on session,students will naturally establish the connection between 2D drawings and 3D *** addition,by comparing the efforts needed to complete the Lego house with both methods,students can easily recognize the benefits of using BIM in *** case study demonstrates the procedures of using Lego blocks as an instructional tool in a hands-on session of an introductory BIM course.

关键词： BIM construction management Lego blocks instructional tool hands-on.