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Fast quantum search driven by environmental engineering

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Communications in Theoretical Physics 2022年第4期74卷 31-41页

作者： rui Zhang Tian chen National Engineering Laboratory for Risk Perception and Prevention(NEL-RPP) CAEITBeijing 100041China Beijing Key Laboratory of Nanophotonics and Ultrafine Optoelectronic Systems School of PhysicsBeijing Institute of TechnologyBeijing 100081China

Studies have demonstrated that a joined complete graph is a typical mathematical model that can support a fast quantum search. In this paper, we study the implementation of joined complete graphs in atomic systems and realize a quantum search of runtime ■ based on this implementation with a success probability of 50%. Even though the practical systems inevitably interact with the surrounding environment, we reveal that a successful quantum search can be realized through delicately engineering the environment itself. We consider that our study will bring about a feasible way to realize quantum information processing including quantum algorithms in reality.

关键词： quantum walk quantum search algorithm environmental engineering non-Markovian

Topological nodal line semimetals predicted from first-principles calculations

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Frontiers of physics 2017年第3期12卷 29-42页

作者： rui Yu Zhong Fang xi Dai Hongming Weng School of Physics and Technology Wuhan University Wuhan 430072 China Beijing National Laboratory for Con-densed Matter Physics and Institute of Physics Chinese Academy of Sciences Beijing 100190 China Collaborative Innovation Center of Quantum Matter Beijing 100190 China

Topological semimetals are newly discovered states of quantum matter, which have extended the con- cept of topological states from insulators to metals and attracted great research interest in recent years. In general, there are three kinds of topological semimetals, namely Dirac semimetals, Weyl semimet- als, and nodal line semimetals. Nodal line semimetals can be considered as precursor states for other topological states. For example, starting from such nodal line states, the nodal line structure might evolve into Weyl points, convert into Dirac points, or become a topological insulator by introducing the spin-orbit coupling （SOC） or mass term. In this review paper, we introduce theoretical materials that show the nodal line semimetal state, including the all-carbon Mackay-Terrones crystal （MTC）, anti-perovskite Cu3PdN, pressed black phosphorus, and the CaP3 family of materials, and we present the design principles for obtaining such novel states of matter.

关键词： topological states topological semimetals nodal line semimetal

An extended numerical model of the first exothermic peak for three dimensional printed cement-based materials

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Frontiers of Structural and Civil Engineering 2024年第1期18卷 80-88页

作者： Wei JIANG Wenqian LI xi chen School of Materials Science and Engineering Tongji UniversityShanghai 200092China School of Civil Engineering Tongji UniversityShanghai 200092China

The first exothermic peak of cement-based material occurs a few minutes after mixing,and the properties of three dimensional(3D)printed concrete,such as setting time,are very sensitive to *** this background,based on the classical Park cement exothermic model of hydration,we propose and construct a numerical model of the first exothermic peak,taking into account the proportions of C_(3)S,C_(3)A and quicklime in *** calculated parameters are calibrated by means of relevant published exothermic test *** is found that this developed model offers a good simulation of the first exothermic peak of hydration for C_(3)S and C_(3)A proportions from 0 to 100% of cement clinker and reflects the effect of quicklime content at 8%-10%.The unique value of this research is provision of an important computational tool for applications that are sensitive to the first exothermic peak of hydration,such as 3D printing.

关键词： 3D printed cement-based materials cement hydration the first exothermic peak liquid quick-setting agent numerical model

Synthesis and Crystal Structure of [Cp_2Ln(OC(SEt)NPh )]_2

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Chinese Journal of Structural Chemistry 2006年第2期25卷 131-134页

作者： ZHANG Chun-Mei LIU rui-Ting ZHOU xi-Geng Department of Chemistry Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials Fudan University Shanghai 200433 China Department of Chemistry East China University of Science and Technology Shanghai 200237 China

Treatment of Cp3Y with EtSH, followed by reaction with an equivalent of PhNCO, yielded the dinuclear complex [Cp2Y（μ-η^1：η^3-OC（SEt）NPh）]2. The structure was characterized by elemental analysis, IR, MS and single-crystal X-ray diffraction analysis. The title compound crystallizes in triclinic, space group P1^- with a = 8.643（3）, b = 10.752（4）, c = 11.161（4）A°, α= 117.840（5）, β = 94.086（5）, γ= 101.008（5）°, V = 884.8（6） A°^3, Z = 1, Mr = 798.66 （C38H40N2O2S2Y2）, λ（MoKα） = 0.710730 .A°, ,μ= 3.417 mm^-1, Dc = 1.499 g/cm^3, F（000） = 408, the final R = 0.0453 and wR = 0.1007 for 3067 unique reflections （Rint = 0.0317） with 2357 observed ones （I 〉 2σ（I））. X-ray analysis reveals an unusual bonding mode of the OC（SEt）NPh ligand and the OCN fragment acts as a both bridging and side-on chelating ligand. Each yttrium atom is coordinated by two η^5-cyclopentadienyl groups, one chelating η^3-OC（SEt）NPh ligand and one bridging O atom from another η^3-OC（SEt）NPh ligand.

关键词： organolanthanide isocyanate insertion structure cyclopentadienyl

Fabrication of textured Ti2AlC lamellar composites with improved mechanical properties

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Journal of Materials Science & Technology 2020年第3期38卷 86-92页

作者： xi xie rui Yang Yuyou Cui Qing Jia Chunguang Bai School of Materials Science and Engineering University of Science and Technology of ChinaHefei 230000China Institute of Metal Research Chinese Academy of SciencesShenyang 110016China

Textured Ti2AlC lamellar composites have been successfully fabricated by a new method in the present *** composites exhibit high compressive strength of ca 2 GPa,fracture toughness of 8.5 MPa m1/2(//c-axis),flexural strength of 735 MPa(//c-axis)and high hardness of 7.9 GPa(//c-axis).The strengthening mechanisms were *** sintering and densification process was investigated and crystal orientation and microstructure were studied by electron backscattered diffraction *** synthesis temperature is reduced to 1200?C by using high surface-to-volume ratio Ti2AlC nano *** Lotgering orientation factor of Ti2 AlC and Ti3 AlC2{00 l}planes in the textured top surface reaches 0.74 and 0.49,*** new route may shed light on resolving the difficulties encountered in large scale fabrication of textured MAX phases.

关键词： MAXphase Ti2AlC Machinable ceramics Ceramic-matrix composites Reactive milling In-situ synthesis Nanocomposites Texture Lamellar microstructure

The Synthesis of α-DDB, β-DDB and Theoretical Study with AM1

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Chinese Chemical Letters 2001年第6期12卷 491-494页

作者： rui Yun GUO Jun Biao CHANG Rong Feng chen Jing xi xiE Da Yu YAN Henan Institute of Chemistry Zhengzhou 450002 Institute of Meteria Medica Chinese Academy of Medical ScienceBeijing 100050 The Graduate School of University of Science and Technology of China Beijing 100039

The present paper reports the synthesis of two analogs of Schzandrin C (-DDB, (-DDB with the gallic acid as the starting material. The key step is the synthesis of monomer of (-DDB and (-DDB for coupling. (-DDB, (-DDB have different yields in Ullmann coupling reaction under the same condition. The yield of (-DDB is little lower than that of (-DDB. The AM1 calculation demonstrates that ΔH of the Ullmann coupling reaction of (-DDB and (-DDB are different. The former is -175.76966KJ/mol and the later is -203.21246KJ/mol. This is in agreement with the fact that (-DDB has higher yield than (-DDB.

关键词： Analogs of Schzandrin C biphenyl dimenthoxy dicarboxylate biphenyl AM1 calculation

Recent Advances on Surface-modified Biomaterials Promoting Selective Adhesion and Directional Migration of Cells

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Chinese Journal of Polymer Science 2021年第7期39卷 815-823页

作者： chen-xi Tu Chang-You Gao MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China

The surfaces and interfaces of biomaterials interact with the biological systems in multi-scale levels,and thereby influence the biological functions and comprehensive performance in vitro and in *** particular,a surface promoting the selective adhesion and directional migration of desired types of cells in complex environment is extremely important in the repair and regeneration of tissues such as peripheral nerve and blood vessel,and long-term application of intracorporal devices such as intravascular ***,surface modification of biomaterials is a facile and effective method to achieve the desired cell-biomaterials *** this short review,recent advances on the surface modification of biomaterials to regulate selective cell adhesion and migration are briefly *** particular,the surface properties of biomaterials are manipulated via the convenient introduction of amino groups to the ester-based polymers,the formation of polyelectrolyte multilayers,and the fabrication of topology and gradient cues,etc.,followed by the association of chemical and biological signals such as collagen,heparin,hyaluronic acid,peptides and cell growth *** selective adhesion and directional migration of various types of cells such as endothelial cells(ECs),smooth muscle cells(SMCs),hepatocytes and Schwann cells(SCs)are achieved over the competitive counterpart cells by the use of cell-resisting substances and cell-selective motifs on gradient substrates in most *** advances on cell behaviors in three-dimensional(3D)ceH-extracellular matrix(ECM)-mimicking substrates are also reviewed.

关键词： Biomaterials Surface modification Gradient Cell migration Cell selectivity

Immunocytochemical examination of PTEN and Ki-67 for endometrial carcinoma using thin-layer endometrial preparations

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BIOCELL 2021年第4期45卷 923-932页

作者： xi YANG KE MA rui chen NAIYI ZHANG YITING MENG JIA WEN QINPING LIAO Department of Obstetrics and Gynecology Beijing Tsinghua Changgung HospitalMedical Center of Tsinghua UniversityBeijing102218China Department of Gynecology Beijing Cancer HospitalBeijing100142China Department of Pathology Beijing Tsinghua Changgung HospitalMedical Center of Tsinghua UniversityBeijing102218China

The current study is designed to evaluate certain immunocytochemical(ICC)biomarkers to gain a better *** this purpose,85 patients from March 2016 to March 2019 who planned to get a hysteroscopy assay were *** sampling was conducted by scratching the uterus cavity using SAP-1,and the samples were processed as liquid-based smears,using SurePath technology.36 patients diagnosed with EC or atypical endometrial hyperplasia were recruited in this study.33 cases were diagnosed with EC,and 3 cases were diagnosed with atypical endometrial hyperplasia,allocated with EC or precancerous lesions group.26 cases were diagnosed with benign lesions *** these cases,9 cases were diagnosed with endometrial simple hyperplasia,2 cases were diagnosed with complicated hyperplasia,5 cases were diagnosed with an irregular proliferation of endometrium and 10 cases were diagnosed with endometrial *** were 23 cases in the healthy *** in thin-layer endometrial preparations by ICC and using H-score or counting the percentage of stained *** presentation of PTEN in normal endometrium,benign lesions,and EC/precancerous lesions were different(p<0.01).Taking the cut-off value of 50(Youden’s index:0.698)PTEN expression for the diagnosis of EC/precancerous lesion,the sensitivity and specificity were 83.7%and 86.1%.The presentation of Ki-67 in normal endometrium,benign lesions,and EC/precancerous lesions were different(p<0.01).Taking the cut-off value of 15%(Youden’s index:0.76)Ki-67 expression for the diagnosis of EC/precancerous lesion,the sensitivity and specificity were 94.4%and 81.6%.In this study,the use of different cut-off values for Ki-67 and PTEN helped differentiate endometrial *** in the ECT detection of PTEN and Ki-67 can improve the diagnostic capabilities of endometrial cancer and precancerous lesions.

关键词： Immunocytochemical expression PTEN Ki-67 Endometrial carcinoma Thin-layer endometrial preparation

Enhanced power saving mechanism for supporting multicast services in 802.11 wireless LANs

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2009年第6期10卷 828-833页

作者： Yong HE rui-xi YUAN xiao-jun MA Jun LI Center for Intelligent & Networked Systems Tsinghua University Beijing 100084 China Thomson Broadband R&D Co. Ltd Beijing 100085 China

Traditional 802.11 power saving mechanism (PSM) treats multicast and broadcast traffic equally, and suffers sig-nificant performance degradation with multicast background traffic. This paper proposes an enhanced PSM that effectively dif-ferentiates multicast streams. It re-arranges the virtual bitmap of the traffic indication map (TIM) to carry traffic status for mul-ticast groups and introduces a concept of sequential transmission of multi-addressed data to facilitate differentiation among mul-ticast groups. Our analysis shows that the enhanced PSM can effectively save power in mixed traffic environments.

关键词： 802.11 Wireless network Power saving Multicast services