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Bandgap opening in MoTe2 thin flakes induced by surface oxidation

Frontiers of physics 2020年第3期15卷 105-111页

作者： Yuan Gan Jiyuan Liang Chang-woo Cho si Li Yanping Guo Xiaoming Ma Xuefeng Wu Jinsheng Wen Xu Du Mingquan He Chang Liu Shengyuan A.Yang Kedong Wang Liyuan Zhang National Laboratory of Solid State Microstructures and Department of Physics Nanjing UniversityNanjing210093China Department of Physics Southern University of Science and TechnologyShenzhen518055China School of Physics and Electronics Hunan Normal UniversityChangsha410081China Research Laboratory for Quantum Materials Singapore University of Technology and DesignSingapore487372Singapore Beijing National Laboratory for Condensed Matter Physics and Institute of Physics Chinese Academy of SciencesBeijing100190China Department of Physics and Astronomy Stony Brook UniversityStony BrookNY11794USA Chongqing Key Laboratory of Soft Condensed Matter Physics and Smart Materials College of PhysicsChongqing UniversityChongqing401331China

Recently,the layered transition metal dichalcogenide 1T′-MoTe2 has generated considerable interest due to their superconducting and non-trivial topological ***,we present a systematic study on 1T′-MoTe2 single-crystal and exfoliated thin-flakes by means of electrical transport,scanning tunnelling microscope(STM)measurements and band structure *** a bulk sample,it exhibits large magneto-resistance(MR)and Shubnikov–de Hass oscillations inρxx and a series of Hall plateaus inρxy at low ***,the MoTe2 thin films were intensively investigated with thickness *** samples,without encapsulation,an apparent transition from the intrinsic metallic to insulating state is observed by reducing *** such thin films,we also observed a suppression of the MR and weak anti-localization(WAL)*** attributed these effects to disorders originated from the extrinsic surface chemical reaction,which is consistent with the density functional theory(DFT)calculations and in-situ STM *** contrast to samples without encapsulated protection,we discovered an interesting superconducting transition for those samples with hexagonal Boron Nitride(h-BN)film *** results indicate that the metallic or superconducting behavior is its intrinsic state,and the insulating behavior is likely caused by surface oxidation in few layer 1T’-MoTe2 flakes.

关键词： two-dimensional materials metal-insulator transition layered transition metal dichalcogenides(TMDs) surface oxidation

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Repeat hepatic resection in patients with colorectal liver metastases

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World Journal of Gastroenterology 2015年第7期21卷 2124-2130页

作者： Huisong Lee Seong Ho Choi Yong Beom Cho Seong Hyeon Yun Hee Cheol Kim woo Yong Lee Jin Seok Heo Dong wook Choi Kyung uk Jung Ho-Kyung Chun Department of Surgery Samsung Medical Center Sungkyunkwan University School of Medicine Department of Surgery Kangbuk Samsung Hospital Sungkyunkwan University School of Medicine

AIM:To investigate the survival outcomes of secondaryhepatectomy for recurrent colorectal liver metastases(CRLM).METHODS:From October 1994 to December 2009,patients with CRLM who underwent surgical treatment with curative intent were *** were divided into two groups:patients who underwent primary hepatectomy(Group 1)and those who underwent secondary hepatectomy for recurrent CRLM(Group 2).RESULTS:Survival and prognostic factors were analyzed.A total of 461 patients were included:406patients in Group 1 and 55 patients in Group *** a median 39-mo(range,3-195 mo)follow-up,there was a significant difference between Groups 1 and 2in terms of disease-free survival(P=0.029)although there was no significant difference in overall survival(P=0.206).Secondary hepatectomy was less effective in patients with multiple recurrent CRLM than primary hepatectomy for initial CRLM(P=0.008).Multiple CRLM and radiofrequency ablation therapy were poor prognostic factors of secondary hepatectomy in multivariate Cox regression analysis(P=0.006,P=0.004,respectively).CONCLUsiON:Secondary hepatectomy for single recurrent CRLM is as effective as primary surgical treatment for single recurrent ***,secondary hepatectomy for multiple recurrent CRLM is less effective than that for single recurrent CRLM.

关键词： Colorectal neoplasm Metastasis Recurrence Hepatect

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A sulfur self-doped multifunctional biochar catalyst for overall water splitting and a supercapacitor from Camellia japonica flowers

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Carbon Energy 2022年第4期4卷 491-505页

作者： Chengkai Xia Subramani Surendran Seulgi Ji Dohun Kim Yujin Chae Jaekyum Kim Minyeong Je Mi-Kyung Han woo-Seok Choe Chang Hyuck Choi Heechae Choi Jung Kyu Kim uk sim School of Chemistry Engineering Sungkyunkwan UniversitySuwonRepublic of Korea Hydrogen Energy Technology Laboratory Korea Institute of Energy Technology(KENTECH)NajuRepublic of Korea Department of Materials Science&Engineering Chonnam National UniversityGwangjuRepublic of Korea Theoretical Materials&Chemistry Group University of CologneCologneGermany Research Institute NEEL SciencesInc.NajuSouth Korea Department of Chemistry Pohang University of Science and Technology(POSTECH)Gyeongsangbuk-doRepublic of Korea

A versatile use of a sulfur self-doped biochar derived from Camellia japonica(camellia)flowers is demonstrated as a multifunctional catalyst for overall water splitting and a *** native sulfur content in the camellia flower facilitates in situ self-doping of sulfur,which highly activates the camellia-driven biochar(SA-Came)as a multifunctional catalyst with the enhanced electron-transfer ability and long-term *** water splitting,an SA-Came-based electrode is highly stable and shows reaction activities in both hydrogen and oxygen evolution reactions,with overpotentials of 154 and 362 mV at 10 mA cm^(−2),*** supercapacitors,SA-Came achieves a specific capacitance of 125.42 F g^(−1)at 2 A g^(−1)and high cyclic stability in a three-electrode system in a 1 M KOH *** demonstrated a high energy density of 34.54 Wh kg^(−1)at a power density of 1600 W kg^(−1)as a symmetric hybrid supercapacitor device with a wide working potential range of 0-1.6 V.

关键词： activated carbon biomass supercapacitor sustainable chemistry water splitting

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COMPUTATION OF STRESS INTENsiTY FACTORS BY THE SUB-REGION MIXED FINITE ELEMENT METHOD OF LINES

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Acta Mechanica Solida sinica 2007年第2期20卷 149-162页

作者： Yuan si Xu Yongjun WILLIAMS F W Department of Civil Engineering Tsinghua University Beijing 100084 China Institute of Mechanics Chinese Academy of Sciences Beijing 100080 China Structural Engineering Division Cardiff University Cardiff CF2 3TB UK

Based on the sub-region generalized variationM principle, a sub-region mixed version of the newly-developed semi-analytical ＇finite element method of lines＇（FEMOL） is proposed in this paper for accurate and efficient computation of stress intensity factors （siFs） of two-dimensional notches/cracks. The circular regions surrounding notch/crack tips are taken as the complementary energy region in which a number of leading terms of singular solutions for stresses are used, with the sought siFs being among the unknown coefficients. The rest of the arbitrary domain is taken as the potential energy region in which FEMOL is applied to obtain approximate displacements. A mixed system of ordinary differential equations （ODEs） and algebraic equations is derived via the sub-region generalized variational principle. A singularity removal technique that eliminates the stress parameters from the mixed equation system eventually yields a standard FEMOL ODE system, the solution of which is no longer singular and is simply and efficiently obtained using a standard general-purpose ODE solver. A number of numerical examples, including bi-material notches/cracks in anti-plane and plane elasticity, are given to show the generally excellent performance of the proposed method.

关键词： stress intensity factors finite element method of lines sub-region generalized variational principle ordinary differential equation solver

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Fault-Induced Coal Burst Mechanism under Mining-Induced Static and Dynamic Stresses

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Engineering 2021年第5期7卷 687-700页

作者： Wu Cai Linming Dou Guangyao si Yawei Hu State Key Laboratory of Coal Resources and Safe Mining School of MinesChina University of Mining and TechnologyXuzhou 221116China Department of Earth Science and Engineering Royal School of MinesImperial College LondonLondon SW72AZUK School of Minerals and Energy Resources Engineering University of New South WalesSydneyNSW 2052Australia

Fault is a common geological structure that has been revealed in the process of underground coal excavation and *** nature of its discontinuous structure controls the deformation,damage,and mechanics of the coal or rock *** interaction between this discontinuous structure and mining activities is a key factor that dominates fault reactivation and the coal burst it can *** paper first summarizes investigations into the relationships between coal mining layouts and fault occurrences,along with relevant conceptual models for fault ***,it proposes mechanisms of fault reactivation and its induced coal burst based on the superposition of static and dynamic stresses,which include two kinds of fault reactivations from:mining-induced quasi-static stress(FRMSS)-dominated and seismic-based dynamic stress(FRSDS)-*** two kinds of fault reactivations are then validated by the results of experimental investigations,numerical modeling,and in situ microseismic *** this basis,monitoring methods and prevention strategies for fault-induced coal burst are discussed and *** results show that fault-induced coal burst is triggered by the superposition of high static stress in the fault pillar and dynamic stress from fault *** static stress comes from the interaction of the fault and the roof structure,and dynamic stress can be ascribed to FRMSS and *** results in this paper could be of great significance in guiding the monitoring and prevention of fault-induced coal bursts.

关键词： Coal burst Fault reactivation Mining-induced stress Seismic-based dynamic stress Fault pillar

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On-chip plasmonic spin-Hall nanograting for simultaneously detecting phase and polarization singularities

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Light(Science & Applications) 2020年第1期9卷 1095-1103页

作者： Fu Feng Guangyuan si Changjun Min Xiaocong Yuan Michael Somekh Nanophotonics Research Center Shenzhen Key Laboratory of Micro-Scale Optical Information TechnologyShenzhen UniversityShenzhen 518060China Melbourne Centre for Nanofabrication Victorian Node of the Australian National Fabrication FacilityClaytonVICAustralia Faculty of Engineering University of NottinghamNottingham NG72RDUK

Phase and polarization singularities are important degrees of freedom for electromagnetic field *** these singularities is essential for modern optics,but it is still a challenge,especially in integrated optical *** this paper,we propose an on-chip plasmonic spin-Hall nanograting structure that simultaneously detects both the polarization and phase singularities of the incident cylindrical vortex vector beam(CVVB).The nanograting is symmetry-breaking with different periods for the upper and lower parts,which enables the unidirectional excitation of the surface plasmon polariton depending on the topological charge of the incident optical vortex ***,spin-Hall meta-slits are integrated onto the grating so that the structure has a chiral response for polarization *** demonstrate theoretically and experimentally that the designed structure fully discriminates both the topological charges and polarization states of the incident beam *** proposed structure has great potential in compact integrated photonic circuits.

关键词： polarization simultaneous phase

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Anesthetics management of a renal angiomyolipoma using pulse pressure variation and non-invasive cardiac output monitoring: A case report

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World Journal of Clinical Cases 2022年第24期10卷 8656-8661页

作者： woo Jae Jeon woo Jong Shin Young Joon Yoon Chan woo Park Jae Hang Shim Sang Yun Cho Department of Anesthesiolgy and Pain Medicine Hanyang University Guri HospitalGuri-si 471-701Gyeonggi-doSouth Korea

BACKGROUND Hypovolemic shock can lead to life-threatening organ dysfunction,and adequate fluid administration is a fundamental ***,parameters such as vital signs,central venous pressure,and urine output have been used to estimate intravascular ***,pulse pressure variation(PPV)and non-invasive cardiac monitoring devices have been *** this case report,we introduce a patient with massive active bleeding from giant renal angiomyolipoma(AML).During emergent nephrectomy,we used non-invasive cardiac monitoring with CSN-1901(Nihon Kohden,Tokyo,Japan)and PPV to evaluate the patient's intravascular volume status to achieve optimal fluid *** SUMMARY A 30-year-old male patient with giant AML with active bleeding was referred to the emergency room complaining of severe abdominal pain and spontaneous abdominal *** was diagnosed by computed tomography,and emergent nephrectomy was *** bleeding was expected so we decided to use non-invasive cardiac monitoring and PPV to assist fluid therapy because they are relatively easy and fast compared to invasive cardiac *** the surgery,6000 mL of estimated blood loss *** with the patient's vital signs and laboratory results,we monitored cardiac output,cardiac output,stroke volume,stroke volume index with a non-invasive cardiac monitoring device,and PPV using an intra-arterial catheter to evaluate intravascular volume status of the patient to compensate for massive *** In addition to traditional parameters,non-invasive cardiac monitoring and PPV are useful methods to evaluate patient's intravascular volume status and provideguidance for intraoperative management of hypovolemic shock patients.

关键词： Renal angiomyolipoma Pulse pressure variation Cardiac output Case report

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A Study of Multiple Solutions for the Navier-Stokes Equations by a Finite Element Method

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Numerical Mathematics(Theory,Methods and Applications) 2014年第1期7卷 107-122页

作者： Huanxia Xu Ping Lin Xinhui si Department of Mathematics and Mechanics University of Science and Technology BeijingBeijing 100083China Department of Mathematics University of DundeeDundee DD14HNUK.

In this paper,a finite element method is proposed to investigate multiple solutions of the Navier-Stokes equations for an unsteady,laminar,incompressible flow in a porous expanding *** or triple solutions for the fixed values of the wall suction Reynolds number R and the expansion ratioαare obtained *** computed multiple solutions for the symmetric flow are validated by comparing them with approximate analytic solutions obtained by the similarity transformation and homotopy analysis *** previous works,our method deals with the Navier-Stokes equations directly and thus has no similarity and other restrictions as in previous *** we use the method to study multiple solutions for three cases of the asymmetric flow(which has not been studied before using the similarity-type techniques).

关键词： Finite element method Navier-Stokes equations porous channel expanding walls

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Enhanced delivery of a low dose of aducanumab via FUS in 5×FAD mice,an AD model

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Translational Neurodegeneration 2022年第1期11卷 31-45页

作者： Chanho Kong Eun-Jeong Yang Jaewoo Shin Junwon Park si-Hyun Kim Seong-wook Park Won Seok Chang Chang-Han Lee Hyunju Kim Hye-Sun Kim Jin woo Chang Department of Neurosurgery Yonsei University College of Medicine50 Yonsei-RoSeodaemun-GuSeoulRepublic of Korea Department of Pharmacology College of MedicineSeoul National University103 DaehakroJongro-GuSeoulRepublic of Korea Neuroscience Research Center College of MedicineSeoul National University103 DaehakroJongro-GuSeoulRepublic of Korea Department of Biomedical Sciences College of MedicineSeoul National University103 DaehakroJongro-GuSeoulRepublic of Korea Bundang Hospital Seoul National University College of MedicineBundang-GuSungnamRepublic of Korea.

Background:Aducanumab(Adu),which is a human IgG1 monoclonal antibody that targets oligomer and fibril forms of beta-amyloid,has been reported to reduce amyloid pathology and improve impaired cognition after administration of a high dose(10 mg/kg)of the drug in Alzheimer’s disease(AD)clinical *** purpose of this study was to investigate the effects of a lower dose of Adu(3 mg/kg)with enhanced delivery via focused ultrasound(FUS)in an AD mouse ***:The FUS with microbubbles opened the blood-brain barrier(BBB)of the hippocampus for the delivery of *** combined therapy of FUS and Adu was performed three times in total and each treatment was performed biweekly.Y-maze test,Brdu labeling,and immunohistochemical experimental methods were employed in this *** addition,RNA sequencing and ingenuity pathway analysis were employed to investigate gene expression profiles in the hippocampi of experimental ***:The FUS-mediated BBB opening markedly increased the delivery of Adu into the brain by approximately 8.1 times in the *** combined treatment induced significantly less cognitive decline and decreased the level of amyloid plaques in the hippocampi of the 5×FAD mice compared with Adu or FUS *** treatment with FUS and Adu activated phagocytic microglia and increased the number of astrocytes associated with amyloid plaques in the hippocampi of 5×FAD ***,RNA sequencing identified that 4 enriched canonical pathways including phagosome formation,neuroinflammation signaling,CREB signaling and reelin signaling were altered in the hippocami of 5×FAD mice receiving the combined ***:In conclusion,the enhanced delivery of a low dose of Adu(3 mg/kg)via FUS decreases amyloid deposits and attenuates cognitive function ***-mediated BBB opening increases adult hippocampal neurogenesis as well as drug *** present an AD treatment strategy through the synergistic effect of the combined therapy of

关键词： Aducanumab Alzheimer’s disease Focused ultrasound Transcriptome profiling

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FOLFIRINOX vs gemcitabine/nab-paclitaxel for treatment of metastatic pancreatic cancer: single-center cohort study

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World Journal of Gastrointestinal Oncology 2020年第2期12卷 182-194页

作者： In Rae Cho Huapyong Kang Jung Hyun Jo Hee Seung Lee Moon Jae Chung Jeong Youp Park Seung woo Park si Young Song Chansik An Mi-Suk Park Seungmin Bang Department of Internal Medicine International Saint Mary’s HospitalCatholic Kwandong University College of MedicineIncheon 22711South Korea Department of Medicine Yonsei University Graduate School50-1 Yonsei-roSeoul 03722South Korea Division of Gastroenterology Department of Internal MedicineYonsei University College of Medicine50-1 Yonsei-roSeoul 03722South Korea Department of Radiology Yonsei University College of Medicine50-1 Yonsei-roSeoul 03722South Korea

BACKGROUND FOLFIRINOX and gemcitabine plus nab-paclitaxel(Gem+nabPTX)were recently introduced for metastatic pancreatic cancer ***,studies that compared these two regimens and studies in Asian populations are *** To compare the treatment outcomes of FOLFIRINOX and Gem+nabPTX regimen for metastatic pancreatic cancer treatment in Korean *** Patients with metastatic or recurrent pancreatic cancer treated with FOLFIRINOX(n=86)or Gem+nabPTX(n=81)as the first-line since January 2015 were identified using the Severance Hospital Pancreatic Cancer Cohort *** efficacy,treatment-related adverse events and economic aspects were *** Patients in the FOLFIRINOX group were significantly younger(54 vs 65 years;Psion-free survival(8.0 vs 8.4 mo;P=0.134),and objective response rates(33.7%vs 46.9%;P=0.067)were not significantly different when compared with Gem+nabPTX ***≥3 neutropenia and gastrointestinal adverse events were more common in the FOLFIRINOX *** drug costs of both regimens were *** Treatment efficacy and economic burdens were comparable between the two ***,the details of adverse event were ***+nabPTX regimen might be considered preferentially in certain conditions.

关键词： Pancreatic cancer Chemotherapy FOLFIRINOX Gemcitabine Nabpaclitaxel Survival

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