THREE-DIMENSIONAL RECONSTRUCTION OF TWODIMENSIONAL INTRAVASCULAR ULTRASOUND IMAGES

The purpose of the study is to reconstruct the coronary arteries in 3 dimension (3D) from serial intravascular ultrasound (IVUS) images generated during a pullback of IVUS catheter. Slowly pullback. real-time, cross-sectional IVUS images of 18 patients (2 with normal coronary arteries. 1 with coronary aneurysm. and 15 post PTCA) were obtained by using a 20 MHz. 3.5F IVUS catheter and recorded on video tape. A series of 90-frame consecutive IVUS images were digitized into a SUN Spare 11 workstation. Digitized data were reconstructed to 3D images with use of voxel space modeling and were generated in both sagittal and cylindrical formats. The sagittal format results in a longitudinal

SIMULTANEOUS QUANTITATION OF FIVE PANAX NOTOGINSENG SAPONINS IN EIGHT CHINESE PATENT MEDICINES BY MULTI HEART-CUTTING TWODIMENSIONAL LIQUID CHROMATOGRAPHY

Current China Pharmacopoeia(ChP)standards employ diversified and case-dependent assay methods to evaluate the quality of different Chinese patent medicines(CPM)that contain Panax notoginseng as the monarch drug.This study is aimed to develop a two-dimensional liquid chromatography(2D LC)based assay approach to unify and simplify the quality assessment of Notoginseng containing CPMs.Multi heart-cutting 2D LC(MHC-2D LC)was used to separate and quantify five major

Toward intrinsic room-temperature ferromagnetism in two-dimensional semiconductors

Two-dimensional (2D) ferromagnetic semiconductors have been recognized as the most promising candidates for next-generation low-cost, high-performance and nano-scale spintronic applications such as spin field-effect transistors and quantum computation/communication. However, as one of the 125 important scientific issues raised by Science journal in 2005 that "is it possible to create magnetic semiconductors that work at room temperature?", how to achieve a feasible ferromagnetic semiconductor with high Curie temperature is still a long-standing challenge despite of tremendous efforts have been devoted in this field since 1960s. The recent discovery of 2D ferromagnetic semiconductors Cr2Ge2Te6 and CrI3 has evoked new research interests in 2D intrinsic ferromagnetic semiconductors. But the low Curie temperature (<45 K) of these materials is still badly hindering their industrial applications.

A－HIGH－ORDER ACCURACY EXPLICIT DIFFERENCE SCHEME FOR SOLVING THE EQUATION OF TWO－DIMENSIONAL PARABOLIC TYPE

In this paper. a three explicit difference shcemes with high order accuracy for solving the equations of two-dimensional parabolic type is proposed. The stability condition is r=△t/△x￣ 2=△t/△y￣2≤1/4 and the truncation error is O (△t￣2 + △x￣4 ).

Different optical properties in different periodic slot cavity geometrical morphologies

In this paper,optical properties of two-dimensional periodic annular slot cavity arrays in hexagonal close-packing on a silica substrate are theoretically characterized by finite difference time domain（FDTD） simulation method.By simulating reflectance spectra,electric field distribution,and charge distribution,we confirm that multiple cylindrical surface plasmon resonances can be excited in annular inclined slot cavities by linearly polarized light,in which the four reflectance dips are attributed to Fabry–Perot cavity resonances in the coaxial cavity.A coaxial waveguide mode TE11 will exist in these annular cavities,and the wavelengths of these reflectance dips are effectively tailored by changing the geometrical pattern of slot cavity and the dielectric materials filled in the cavities.These resonant wavelengths are localized in annular cavities with large electric field enhancement and dissipate gradually due to metal loss.The formation of an absorption peak can be explained from the aspect of phase matching conditions.We observed that the proposed structure can be tuned over the broad spectral range of 600–4000 nm by changing the outer and inner radii of the annular gaps,gap surface topography.Meanwhile,different lengths of the cavity may cause the shift of resonance dips.Also,we study the field enhancement at different vertical locations of the slit.In addition,dielectric materials filling in the annular gaps will result in a shift of the resonance wavelengths,which make the annular cavities good candidates for refractive index sensors.The refractive index sensitivity of annular cavities can also be tuned by the geometry size and the media around the cavity.Annular cavities with novel applications can be implied as surface enhanced Raman spectra substrates,refractive index sensors,nano-lasers,and optical trappers.

Two-dimensional magnetic transition metal chalcogenides

The field of two-dimensional(2D)magnets has expanded rapidly during the past several years since the first demonstration of intrinsic 2D magnetism in atomically thin CrI_(3) and Cr_(2)Ge_(2)Te_(6) in 2017.2D transition metal chalcogenides(TMCs),a class of strongly correlated materials,have exhibited a wide variety of novel electronic and optical properties,and more recently magnetism.Here,we review recent experimental progress achieved in the growth of 2D magnetic TMC materials using chemical vapor deposition and molecular beam epitaxy methods.Outstanding examples include the demonstration of room temperature intrinsic and extrinsic ferromagnetism in monolayer VSe_(2),MnSe_(2),Cr_(3)Te_(4),V-doped WSe_(2),and so on.A brief discussion on the origin of the exotic magnetic properties and emergent phenomena is also presented.Finally,we summarize the remaining challenges and future perspective on the development of 2D magnetic materials for next-generation spintronic devices.

Covalent Organic Frameworks for Energy Conversions:Current Status,Challenges,and Perspectives

Energy conversion into clean fuels is critical to society’s health benefits and sustainable future;thus,exploring materials to enable and facilitate energy conversions with reduced climate-related emissions is a central subject of science and technology.Covalent organic frameworks(COFs)are a class of polymers that enables predesign of both primary-and high-order structures and precise synthesis of long-range structures through one-pot polymerization.Progress over the past 15 years in chemistry has dramatically enhanced our capability of designing and synthesizing COFs and deepening our understanding to explore energy-converting functions that originate from their ordered skeletons and channels.In this minireview,we summarize general strategies for predesigning skeletons and channels and analyze the structural requirements for each type of energy conversion.We demonstrate synthetic approaches to develop energy conversion functions,that is,photocatalytic and electrocatalytic conversions.Further,we scrutinize energy conversion features by disclosing interplays of COFs with photons,holes,electrons,and molecules,highlighting the role of structural orderings in energy conversions.Finally,we have predicted the challenging issues in molecular design and synthesis,and thought of future directions toward advancement in this field,and show perspectives from aspects of chemistry,physics,and materials science,aimed at unveiling a full picture of energy conversions based on predesignable organic architectures.

A Review of Wideband Wide-Angle Scanning 2-D Phased Array and Its Applications in Satellite Communication

In this review,research progress on the wideband wide-angle scanning two-dimensional phased arrays is summarized.The importance of the wideband and the wide-angle scanning characteristics for satellite communication is discussed.Issues like grating lobe avoidance,active reflection coefficient suppression and gain fluctuation reduction are emphasized in this review.Besides,techniques to address these issues and methods to realize the wideband wide-angle scanning phased array are reviewed.

Effects of Fuzheng Huayu Decoction on plasma proteome in cirrhosis:preliminary experimental study with rats

The aim of this paper is to study the effects of Fuzheng Huayu Decoction on the plasma proteome in cirrhotic rats.Twenty-six male Sprague-Dawley(SD)rats were randomly divided into three groups:cirrhotic model group(n510),treated with CCl_(4)(CCl_(4)/olive oil:v/v51:1);Fuzheng Huayu Decoction intervention group(n510),treated with CCl_(4)+Fuzheng Huayu Decoction;and normal control group(n56),treated with olive oil only.After 8 weeks,blood samples were collected from the inferior vena cava to undergo bi-dimensional electrophoresis(2DE)and analysis by PDQuest 7.3 software.Differential protein spots were cut,enzyme hydrolysis was conducted,and peptide fragments extracted from the mixture underwent mass spectrometry(MS)with MALDI-TOF-TOF-MS.The liver fibrogenesis was assessed using a digital image analysis instrument of Masson’s trichrome stained sections.The fibrosis area of the Fuzheng Huayu Decoction was(8.9±3.7)%,significantly smaller than that of the cirrhotic model group[(12.4±4.7)%,P<0.05].Ten markedly changed protein spots were identified by MALDI-TOFTOF-MS.Eight of the 10 proteins,including plasma glutathione peroxidase,plasma glutathione peroxidase precursor,prealbumin,haptoglobin,apolipoprotein A-IV precursor,complement C4,inter-alpha-inhibitor H4 heavy chain,and serine/threonine-protein kinase microtubuleaffinity regulating kinase 1(MARK1)were expressed very lowly in the cirrhotic model group while they were expressed highly in the Fuzheng Huayu Decoction group.The expression of liver regeneration-related protein LRRG03 and vimentin increased in the cirrhotic model group,and reduced in the FuzhengHuayu Decoction group.Some proteins related to oxidative stress,cell proliferation and transformation have changed in the plasma of cirrhosis induced by CCl_(4).Fuzheng Huayu Decoction promotes protein synthesis and plays an anti-fibrotic role by antioxidation and accommodation of cell proliferation and transformation.

高品质锰掺杂二维二硒化钼晶体的光与物质相互作用

最近,将磁性掺杂引入到二维硫族化合物中从而调控自旋电子学及谷电子学的研究引起了科学界的广泛关注.本文通过化学气相转移生长技术,实现了二硒化钼高达2.9%原子丰度的锰掺杂,并采用光谱学技术研究了晶体及解理的少层样品中光与物质相互作用.我们发现掺杂抑制了带电激子的发光,激子发光具有更长的时间寿命,同时面内E_(2g)^(2)和面外A_(1g)声子振动模式分别呈现出显著的蓝移和红移.此外,锰掺杂增强了能谷塞曼劈裂约50%,并保持了发光线偏振度对磁场的依赖关系.第一性原理计算显示,锰掺杂替代原子形成自旋极化的深能级,导致缺陷势场更倾向于捕获激子.锰掺杂降低了原子间的相互作用力常数,可以解释面外A_(1g)声子振动模式的红移.锰原子及最近邻的钼和硒原子带有显著的磁偶极,其交换作用影响了缺陷捕获的激子,从而增强了实验中观察到的g-因子.

Double-sided surface functionalization: An effective approach to stabilize and modulate the electronic structure of graphene-like borophene

Graphene-like borophene was theoretically proposed and recently synthesized on Al(111)surface,however,how to conquer its structural instability is still an open question.By means of density functional theory computations,we theoretically predicted that honeycomb borophene can be well stabilized by double-sided surface passivation with monovalent functional groups(X=F,Cl,Br,I,OH,and NH2)due to the electron redistributions.The system undergoes the transition from metallic to semiconducting upon functionalization,while the energy gap depends on the choice of functional groups.Under external strain,the gap values can be manipulated over a broad range.Our further calculations indicated that the functionalized borophene possesses moderate and anisotropic carrier mobility,which is comparable to or even higher than some 2D materials such as MoS2 and phosphorene.Our work provides a feasible strategy to effectively stabilize the graphene-like borophene and tune the electronic properties with great potentials for electronic applications.