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Exfoliation and dispersion of graphene in ethanol-water mixtures

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Frontiers of Materials Science 2012年第2期6卷 176-182页

作者： Wei-Wei LIU Bao-Yu xia xiao-xia wang Jian-Nong wang Shanghai Key Laboratory for Laser Processing and Materials Modification School of Materials Science and EngineeringShanghai Jiao Tong University800 Dong Chuan RoadShanghai 200240China School of Materials Science and Engineering Tongji University1239 Siping RoadShanghai 200092China Key Laboratory of Safety Science of Pressurized System(Ministry of Education) ScHool of Mechanical and Power EngineeringEast China University of Science and Technology130 Meilong RoadShanghai 200237China

Graphene has attracted much attention as a new nano-carbon for its unique structure and properties. However, production and dispersion of unfunctionalized graphene are still big challenges. Herein, we demonstrate a simple method for preparation and dispersion of such graphene with low cost and non toxicum. This approach is achieved by exfoliating graphite in an ethanol/water mixture and forming stable dispersion of mono- and few-layer graphenes. The ratio of ethanol/water in the mixture is found to be crucial to both the exfoliation and dispersion processes. Exfoliation in pure water or pure ethanol produces no graphene. This method avoids the conventional use of harsh oxidants and surfactants; therefore, the graphitic structure is well maintained without destruction. Benefiting from the use of ethanol and water, it can be easy to prepare transparent and conductive graphene films by vacuum filtering or spray method, and does not need special post-treatment to remove the impurity, which could be beneficial for potential applications in electronic, optic and energy areas.

关键词： graphene liquid-phase exfoliation transparent conductive film solubilityparameter

New Proof for Some Terminating Hypergeometric Series Identities

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Journal of Mathematical Research and Exposition 2011年第1期31卷 115-122页

作者： xiao xia wang Department of Applied Mathematics Shanghai University Shanghai 200444 P. R. China

The Abel＇s lemma on summation by parts is employed to evaluate terminating hypergeometric series. Several summation formulae are reviewed and some new identities are established.

关键词： Abel's lemma on summation by parts classical hypergeometric series

Overexpression of IQGAP1 in human pancreatic cancer

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Hepatobiliary & Pancreatic Diseases International 2013年第5期12卷 540-545页

作者： xiao-xia wang xiao-Zhong Li Li-Qin Zhai Zhi-Rong Liu xian-Jiu Chen Yi Pei Department of Biochemistry and Molecular Biology Shanxi Medical University Department of Geriatric Oncology Shanxi Academy of Medical SciencesShanxi Dayi Hospital Department of Emergency Shanxi Provincial People's Hospital Department of Pathology Shanxi Provincial People's Hospital

BACKGROUND:Pancreatic cancer is a highly aggressive malignant tumor with the lowest survival rate.A better understanding of the molecular mechanisms which contribute to pancreatic cancer occurrence and progression will aid in the development of new approaches to the early diagnosis,prevention,and treatment of this deadly *** scaffold protein IQGAP1 shows elevated levels in a variety of cancer ***,we investigated whether or not IQGAP1 is also overexpressed in pancreatic ***:IQGAP1 expression was examined in pancreatic cancer and normal tissues adjacent to cancerous tissues(adjacent tissues)by Western blotting and real-time RT-PCR as well as in paraffin sections of tissue microarray by *** correlations between IQGAP1 expression and various clinicopathological characteristics were ***:Western blotting and real-time RT-PCR revealed that the levels of IQGAP1 protein and mRNA expression in pancreatic cancer tissues were significantly increased compared with adjacent *** analysis on tissue microarray showed that IQGAP1 protein expression was significantly higher in pancreatic cancer(80.0%,48/60)compared with adjacent tissues(18.3%,11/60)(P<0.001).Moreover,overexpression of IQGAP1 was shown to be associated with the grades of tumor differentiation(P<0.05).CONCLUSION:The overexpression of IQGAP1 may play an important role in pancreatic cancer occurrence and progression,and IQGAP1 may serve as a novel molecular target for the diagnosis and treatment of pancreatic cancer.

关键词： IQGAP1 pancreatic cancer tissue microarray immunohistochemistry

Cefoperazone sodium/sulbactam sodium vs piperacillin sodium/tazobactam sodium for treatment of respiratory tract infection in elderly patients

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World Journal of Clinical Cases 2021年第29期9卷 8694-8701页

作者： xiao-xia wang Cheng-Tai Ma Yan-xia Jiang Yun-Jie Ge Fa-Yun Liu Wen-Gang Xu Department of Cadre Health Qingdao Municipal HospitalQingdao 266011Shandong ProvinceChina Department of Emergency Medicine The Affiliated Hospital of Qingdao UniversityQingdao 266011Shandong ProvinceChina Department of Pathology The Affiliated Hospital of Qingdao UniversityQingdao 266011Shandong ProvinceChina Department of Pulmonary Shandong Qingdao Hospital of Integrated Traditional Chinese and Western MedicineQingdao 266011Shandong ProvinceChina

BACKGROUND Respiratory tract infections in the elderly are difficult to cure and can easily recur,thereby posing a great threat to patient prognosis and quality of *** To investigate the therapeutic effects of different antibiotics in elderly patients with respiratory tract *** Seventy-four elderly patients with respiratory tract infection were randomly allocated to a study(n=37;treated with cefoperazone sodium/sulbactam sodium)or control(n=37;treated with piperacillin sodium/tazobactam sodium on the basis of routine symptomatic support)*** groups were treated for 7 *** to symptom relief(leukocyte recovery;body temperature recovery;cough and sputum disappearance;and rale disappearance time),treatment effect,and laboratory indexes[procalcitonin(PCT),C-reactive protein(CRP),white blood cell count(WBC),and neutrophil percentage(NE)]before and 7 d after treatment and the incidence of adverse reactions were *** In the study group,the time to WBC normalization(6.79±2.09 d),time to body temperature normalization(4.15±1.08 d),time to disappearance of cough and sputum(6.19±1.56 d),and time to disappearance of rales(6.68±1.43 d)were shorter than those of the control group(8.89±2.32 d,5.81±1.33 d,8.77±2.11 d,and 8.69±2.12 d,respectively;P=0.000).Total effective rate was higher in the study group(94.59%vs 75.68%,P=0.022).Serum PCT(12.89±3.96μg/L),CRP(19.62±6.44 mg/L),WBC(20.61±6.38×10^(9)/L),and NE(86.14±7.21%)levels of the study group before treatment were similar to those of the control group(14.05±4.11μg/L,18.79±5.96 mg/L,21.21±5.59×10^(9)/L,and 84.39±6.95%,respectively)with no significant differences(P=0.220,0.567,0.668,and 0.291,respectively).After 7 d of treatment,serum PCT,CRP,WBC,and NE levels in the two groups were lower than those before *** PCT(2.01±0.56μg/L),CRP(3.11±1.02 mg/L),WBC(5.10±1.83×10^(9)/L),and NE(56.35±7.17%)levels were lower in the study group than in the control group(3.29±0.64μg/L,5.67±1.23 mg/L,8.

关键词： Cefoperazone sodium Sulbactam sodium Piperacillin sodium Tazobactam sodium Respiratory tract infection Elderly

Silicon-erbium ytterbium silicate nanowire waveguides with optimized optical gain

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Frontiers of physics 2017年第1期12卷 57-63页

作者： xiao-xia wang Wei-Hao Zheng Qing-Lin Zhang xiao-Li Zhu Hong Zhou Xiu-Juan Zhuang An-Lian Pan xiang-Feng Duan Key Laboratory for Micro-Nano Physics and Technology of Hunan Province School of Physics and Electronic Science and State Key Laboratory of Chemo/Biosensing and Chemometrics Hunan University Changsha 410082 China Department of Chemistry and Biochemistry University of California Los Angeles CA 90095 USA

Single-crystal erbium silicate nanowires have attracted considerable attention because of their high optical gain. In this work, we report the controlled synthesis of silicon-erbium ytterbium silicate core- shell nanowires and fine-tuning the erbium mole fraction in the shell from x = 0.3 to x = 1.0, which corresponds to changing the erbium concentration from 4.8 ×10^21 to 1.6 ×10^22 cm^-3. By controlling and properly optimizing the composition of erbium and ytterbium in the nanowires, we can effectively suppress upeonversion photoluminescence while simultaneously enhancing near-infrared emission. The composition-optimized nanowires have very long photoluminescence lifetimes and large emission cross- sections, which contribute to the high optical gain that we observed. We suspended these concentration- optimized nanowires in the air to measure and analyze their propagation loss and optical gain in the near-infrared communication band. Through systematic measurements using wires with different core sizes, we obtained a maximum net gain of 20 ± 8 dB·mm^-1, which occurs at a wavelength of 1534 nm, for a nanowire with a diameter of 600 nm and a silicon core diameter of 300 nm.

关键词： erbium ytterbium silicate nanowire erbium concentration gain

Association of image-defined risk factors,tumor resectability,and prognosis in children with localized neuroblastoma

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World Journal of Pediatrics 2019年第6期15卷 572-579页

作者： An-An Zhang Ci Pan Min Xu xiao-xia wang Qi-Dong Ye Yi-Jin Gao Jing-Yan Tang Key Laboratory of Pediatric Hematology and Oncology Ministry of HealthDepartment of Pediatric Hematology and OncologyShanghai Children's Medical CenterShanghai Jiaotong University School of Medicine(SJTU-SM)ShanghaiChina

Background Although localized neuroblastoma has a good prognosis,some cases have undergone treatment failure or *** from biologic features such as MYCN status,we wondered whether some characteristics of growing tumors are prognostic,such as a well-encapsulated mass without infiltration of vital *** analyzed the diagnostic utility of image-defined risk factors(IDRFs)to predict successful treatment and *** overall goal was to achieve maximum cure rates for patients with localized neuroblastoma through a better understanding of clinical *** We retrospectively reviewed the images of patients with localized neuroblastoma who were enrolled between June 1998 and December 2012 at a single institution in Shanghai,*** categorization regarding IDRFs was available in 67 *** was assessed at diagnosis and after four cycles of neoadjuvant chemotherapy,on *** median follow-up period was 84 months(range: 48-132 months)after *** MRI and CT indicated a total of 177 IDRFs in these 67 *** regression analysis revealed a highly significant negative correlation between the numbers of IDRFs and the possibility of complete removal of *** extension of the tumor,compression of the trachea,and encasement of the main artery in localized neuroblastoma were predictors for incomplete tumor *** to univariate analysis,≥4 IDRFs and intraspinal extension of the tumor were significant indicators of poor *** The number of IDRFs was useful in predicting surgical outcome and event-free *** number of IDRFs should be considered in protocol planning,instead of IDRF presence or absence.

关键词： Image-defined risk factors Localized neuroblastoma Prognosis Surgery

Single-and Double-Electron Capture Processes in Low-Energy Collisions of N^4+ Ions with He

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Chinese Physics Letters 2020年第2期37卷 15-19页

作者： Kun wang xiao-xia wang Yi-Zhi Qu Chun-Hua Liu Ling Liu Yong Wu Robert JBuenker College of Optoelectronic Technology University of Chinese Academy of SciencesBeijing 100049 School of Physics Southeast UniversityNanjing 210094 Data Center for High Energy Density Physics Institute of Applied Physics and Computational MathematicsBeijing 100088 Fachbereich C-Mathematik und Naturwissenschaften Bergische Universitat WuppertalD-42097 WuppertalGermany

We investigate the electron capture processes of N4+(1s22s)colliding with He(1s2)in the energy range of 10-1700 eV/amu using the quantum-mechanical molecular-orbital close-coupling(QMOCC)*** and stateselective single-electron capture and double-electron capture(SEC and DEC)cross sections are obtained and compared with other available *** results agree better with the experimental data in both trend and magnitude when the electron translation factor(ETF)effects are *** results indicate that both the SEC and DEC processes play important roles in the considered energy *** the SEC processes,the N3+(1s22p2)+He+(1s)states are the dominant capture states,and the N^2+(1s^2 2s2p^2)+He^2+states are the main DEC states.

关键词： method. states Electron

Charge transfer and excitation processes in low energy collisions of He ions with Li atoms

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Research in Astronomy and Astrophysics 2021年第8期21卷 275-284页

作者： xiao-xia wang Kun wang Yi-Geng Peng Chun-Hua Liu Ling Liu Yong Wu Heinz-Peter Liebermann Robert J.Buenker Yi-Zhi Qu College of Material Sciences and Optoelectronic Technology University of Chinese Academy of SciencesBeijing 100049China Institute of Environmental Science Shanxi UniversityTaiyuan 030006China Department of Applied Physics Nanjing University of Science and TechnologyNanjing 210094China School of Physics Southeast UniversityNanjing 210094China Data Center for High Energy Density Physics Institute of Applied Physics and Computational MathematicsBeijing 100088China Fachbereich C-Mathematik und Naturwissenschaften Bergische Universitat WuppertalD-42097 WuppertalGermany

Electron capture between solar wind ions and neutral species has contributed to the understanding of X-ray production from solar system *** charge transfer and excitation processes in solar wind ions of He^(+)(1 s) colliding with Li(1 s^(2)2 s) atoms are studied by utilizing the full quantum-mechanical molecular-orbital close-coupling(QMOCC) method with impact energies of 0.003-2 keV *** of cross sections from single-and multi-configurational calculations for a selfconsistent field(SCF and MCSCF) process are carried *** show that the dominant reaction channels are He(1 s2 l ^(1,3) L)+Li^(+)(1 s^(2) ^(1) S).Good consistency is found among present total and state-selective charge transfer and excitation cross sections with other theoretical and experimental data in the same energy *** to the differences between coupling matrix elements in high-energy states,the charge transfer cross sections calculated from SCF and MCSCF split slightly as E> 0.4 keV *** Stueckelberg oscillations for charge transfer appear in the present *** addition,the differences of cross sections for electron excitation to Li(ls^(2)2 p) in the singlet/triplet molecular states with He+(1 s) are much smaller than those of charge transfer processes because of the similar energy gaps from Li(ls^(2)2 p) to the ground state in singlet/triplet states in the large R region.

关键词： Sun:solar wind ISM:molecules ISM:kinematics and dynamics molecular processes

AFLP Fingerprinting and Genetic Diversity of Main Sweetpotato Varieties in China

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Journal of Integrative Agriculture 2012年第9期11卷 1424-1433页

作者： LIU De-gao ZHAO Ning ZHAI Hong YU xiao-xia JIE Qin wang Lian-jun HE Shao-zhen LIUQing-chang Beijing Key Laboratory of Crop Genetic Improvement/Laboratory of Crop Heterosis and Utilization Ministry of Education/ChinaAgricultural University Beijing 100193 P.R.China

AFLP fingerprinting of the 98 main sweetpotato varieties planted in China has been constructed. Using 17 AFLP primer combinations which were selected from 1 208 primer combinations and generated the most amounts of polymorphic bands, AFLP analysis of the 98 main sweetpotato varieties gave a total of 410 clear polymorphic bands with an average of 24.12 polymorphic bands per primer combination. Each one of the 98 sweetpotato varieties could be clearly distinguished by EcoR I-cta/Mse I-ggc primer combination which generated the most polymorphic bands. AFLP-based genetic distance ranged from 0.0546 to 0.5709 with an average of 0.3799. The dendrogram based on AFLP markers indicated that sweetpotato varieties coming from the same regions or having same parents were clustered in the same groups. Analysis of molecular variance （AMOVA） revealed greater variations within regions （94.08%） than among regions （5.92%）. Thus, the genetic variations mainly existed within regions, while the variations among regions were very low in the tested sweetpotato varieties. Significant genetic variations existed between ＂Northern＂ and ＂Southern＂ sweetpotato varieties when Yangtze River was used as the dividing line.

关键词： AFLP fingerprinting genetic diversity main variety sweetpotato (lpomoea batatas (L.) Lam.)