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Performance of Mo-V-Te-P catalysts supported on the SiC for propane selective oxidation to acrolein

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Chinese Chemical Letters 2011年第11期22卷 1321-1325页

作者： YangWang Fei Ma Shu Chen fang Chen wei Min Lu Institute of Catalysis Zhejiang University （Xixi Campus） Hangzhou 310028 China

A series of MoTe_（0.15）V_（0.1）P_xO_n catalysts supported on the SiC were prepared by incipient wetness *** addition of P to MoTe_（0.15）V_（0.1）O_n/SiC catalysts improved the catalytic performance of selective oxidation from propane to acrolein（ACR）,and the catalyst showed highest selectivity（33.7%） and yield（10.7%） when x = *** MoTe_（0.15）V_（0.1）P_xO_n/SiC catalysts have been characterized by XRD,H_2-TPR,Raman,XPS and NH_*** results indicated that a little H_3PMo_（12）O_（40） heteropoly acid and（VO）_2P_2O_7 formed and MoO_3 phase lessened after addition of *** addition of P promoted the active species dispersed,increased the acidity on the surface,as well as might make the redox process *** significant differences improved the activity and selectivity of ACR.

关键词： Propane Selective oxidation Acrolein Mo-V-Te-P catalysts

Thermal Stability and Degeneration Behavior of Solar Selective Absorber Based on WTi-Al_(2)O_(3)Cermet

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Journal of Wuhan University of Technology(Materials Science) 2024年第6期39卷 1555-1564页

作者： WANG Xiaobo fang wei MA Yuchao CHENG Xudong LI Kewei Department of Physics and Electronic Engineering Jinzhong UniversityJinzhong 030619China College of Materials Science and Engineering Taiyuan University of TechnologyTaiyuan 030024China State Key Laboratory of Advanced Technology for Materials Synthesis and Progressing Wuhan University of TechnologyWuhan 430070China

A WTi-Al_(2)O_(3)cermet-based solar selective absorber was prepared to investigate the atomic diffusion induced spectral selectivity *** as-deposited coating exhibits superior absorptance(0.934)and low thermal emittance(0.098),as well as excellent thermal stability with a selectivity of 0.900/0.07 even after annealing at 923 K for 400 h in Ar ***,the multilayer coating failed after being subjected to annealing at 923 K for 400 h in an air environment,as indicated by a decrease in solar absorptance to 0.912 and an increase in thermal emittance to *** microstructure characterizations reveal that the annealed coating exhibits a columnar morphology along the vertical direction of the *** presence of abundant grain boundaries in the multilayer coating promotes the outward diffusion of Cr and Mn atoms in the stainless-steel *** Mn atoms,in particular,possess the capability to migrate towards the surface of the coating and undergo an oxidation reaction with oxygen,facilitating the formation of a thick Mn_(2)O_(3)*** roughness of the coating surface was significantly increased in this case,adversely affecting solar absorptance due to amplified sunlight *** addition,the rocketing of thermal emittance is attributed to the destabilization of W infrared reflective layer during the *** findings highlight the importance of considering the outward diffusion of Mn and Cr elements in the stainless-steel substrate when optimizing solar selective absorbers.

关键词： solar selective absorber thermal stability spectral selectivity optical properties

Correlation between invasive microbiota in margin-surrounding mucosa and anastomotic healing in patients with colorectal cancer

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World Journal of Gastrointestinal Oncology 2019年第9期11卷 717-728页

作者： Yan-Dong Li Kang-Xin He wei-fang Zhu Division of Colon and Rectal Surgery First Affiliated HospitalZhejiang University School of MedicineHangzhou 310003Zhejiang ProvinceChina State Key Laboratory for Diagnosis and Treatment of Infectious Diseases National Clinical Research Center for Infectious DiseasesCollaborative Innovation Center for Diagnosis and Treatment of Infectious DiseasesThe First Affiliated HospitalCollege of MedicineZhejiang UniversityHangzhou 310003Zhejiang ProvinceChina Division of Dermatology First Affiliated HospitalZhejiang University School of MedicineHangzhou 310003Zhejiang ProvinceChina

BACKGROUND Impaired anastomotic healing is one of the major complications resulting from radical resection in colorectal cancer(CRC).Accumulating evidence suggests that intestinal microbiota is correlated with anastomotic *** To explore the microbiota structural shift in margin-surrounding mucosa and evaluate the predictive ability of selected bacterial taxa for impaired anastomotic *** Margin-surrounding mucosa samples derived from 37 patients were collected to characterize the microbial community structure by 16 s r RNA gene *** patients were divided into two groups according to the healing status of anastomoses:well-healing group(n=30)and impaired-healing group(n=7).Statistic differences in bacteria taxa were compared by Wilcoxon test and chisquared *** predictive ability of the selected bacterial taxa for the healing status of anastomoses was evaluated by the area under the receiver operator characteristic *** Community structure shifts were observed in the impaired-healing group andwell-healing *** bacterial species were found to be significantly correlated with anastomotic healing,and among these species,Alistipes shahii,Dialister pneumosintes,and Corynebacterium suicordis were considered as the predictive *** the known risk factor age into consideration,Alistipes shahii,Dialister pneumosintes,and Corynebacterium suicordis improved predictive ability for the healing status of *** These data show that Alistipes shahii,Dialister pneumosintes,and Corynebacterium suicordis could be considered as supplementary factors in the prediction of anastomosis healing status in patients after CRC radical resection.

关键词： Intestinal microbiota 16s rRNA gene sequencing Anastomotic healing Predictive ability Colorectal cancer Radical resection

Investigation of the genotype III to genotype I shift in Japanese encephalitis virus and the impact on human cases

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Virologica Sinica 2015年第4期30卷 277-289页

作者： Na Han James Adams wei fang Si-Qing Liu Simon Rayner State Key Laboratory for Infectious Diseases Prevention and Control National Institute for Communicable Disease Control and Prevention Chinese Center for Disease Control and Prevention Collaborative Innovation Center for Diagnosis and Treatment of Infectious Diseases State Key Laboratory of Virology Wuhan Institute of Virology Chinese Academy of Sciences Department of Medical Genetics Oslo University Hospital

Japanese encephalitis is a mosquito borne disease and is the leading cause of viral encephalitis in the Asia-Pacific area. The causative agent, Japanese encephalitis virus(JEV) can be phylogenetically classified into five genotypes based on nucleotide sequence. In recent years, genotype I(GI) has displaced genotype III(GIII) as the dominant lineage, but the mechanisms behind this displacement event requires elucidation. In an earlier study, we compared host variation over time between the two genotypes and observed that GI appears to have evolved to achieve more efficient infection in hosts in the replication cycle, with the tradeoff of reduced infectivity in secondary hosts such as humans. To further investigate this phenomenon, we collected JEV surveillance data on human cases and, together with sequence data, and generated genotype/case profiles from seven Asia-Pacific countries and regions to characterize the GI/GIII displacement event. We found that, when comprehensive and consistent vaccination and surveillance data was available, and the GIII to GI shift occurred within a well-defined time period, there was a statistically significant drop in JEV human cases. Our findings provide further support for the argument that GI is less effective in infecting humans, who represent a dead end host. However, experimental investigation is necessary to confirm this hypothesis. The study highlights the value of alternative approaches to investigation of epidemics, as well as the importance of effective data collection for disease surveillance and control.

关键词： flavivirus Japanese encephalitis virus(JEV) bioinf

Experimental study on large wood filtration performance by herringbone water-sediment separation structure

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Journal of Mountain Science 2017年第2期14卷 269-281页

作者： XIE Xiang-ping wei fang-qiang YANG Hong-juan XIE Tao Institute of Mountain Hazards and Environment Chinese Academy of SciencesChengdu 610041China Key Laboratory of Mountain Hazards and Earth Surface Process Chinese Academy of SciencesChengdu 610041China University of Chinese Academy of Sciences Beijing 100049China Chongqing Jiao Tong University Chongqing 400074China

A herringbone water-sediment separation structure(hereinafter referred to as "herringbone structure") has been shown to be effective in separating coarse inorganic debris; however, less is known regarding the large wood(LW) filtration effect in this structure. This paper presents preliminary research on the wood filtration effect of the herringbone structure based on physical model *** results show that the herringbone structure exhibited effective performance in large wood size segregation, with a 100% component filtration rate for LW that diameter(D) larger than ribbed beam opening width(a). The total filtration rate also exceeded 80% when the Fraud number(Fr) is larger than 2.64 and increased with the increase of Fr. After exceeding Frmax, total filtration rate would be decreased due to overflow. Beside flow condition,structure parameters influence significantly on LW filtration rate. We attempt to explain the filtration process via particle contact trajectory and particle movement trajectory. The inclined angle of ribbed beam(γ) contributed the most variation to the filtration rate via influencing the coincidence with particle contact trajectory and particle movement trajectory. The high sensitivity coefficient of ribbed beam(θ) under relatively low Fr conditions implies remarkable influences on LW filtration effects by causing clogging problem. The ribbed beam opening width(a) together with LW diameter(D) influenced the size segregation performance.

关键词： Debris flow Large wood Herringbone water-sediment separation structure Filtration effect

Frequency synchronization for TD-LTE-A downlink receiver

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The Journal of China Universities of Posts and Telecommunications 2012年第1期19卷 31-37页

作者： JIA Guo-qing XIONG Yong YANG Xiu-mei fang wei-dong Shanghai Research Center for Wireless Communications Shanghai 200335 China Shanghai Institute of Micro-System and Information Technology Chinese Academy of Sciences Shanghai 200050 China Key Laboratory of Wireless Sensor Network ＆ Communication Shanghai Institute of Micro-System and Information Technology Chinese Academy of Sciences Shanghai 200335 China

A high accuracy frequency synchronization method is proposed for the 3rd generation partnership project （3GPP） long term evolution advanced （LTE-A） downlink receiver in time division duplexing （TDD） mode. In general, cyclic prefix （CP） correlation based fractional frequency offset （FFO） estimation method and primary synchronization signal （PSS） differential correlation based integer frequency offset （IFO） estimation method are applied for LTE-A frequency synchronization. However, the polarity of CP based FFO estimation result may get reversed when system FFO is closer to the edge of frequency estimation range on account of noise interference; PSS based IFO estimation has performance degradation in low signal noise ratio （SNR）. We propose polarity detection aided CP based FFO estimation and frequency domain enhanced differential correlation based IFO estimation to obtain higher accuracy of frequency synchronization. Computer simulation shows that the proposed method greatly outperforms the conventional methods, especially in low SNR scenario.

关键词： Time-division long term evolution advanced (TD-LTE-A) frequency synchronization high accuracy polarity reversion resistance

Age-dependent expression of forkhead box O proteins in the duodenum of rats

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Journal of Zhejiang University-Science B(Biomedicine & Biotechnology) 2011年第9期12卷 730-735页

作者： Pan HUANG Zhen-qi ZHOU Rui-hua HUANG Bo ZHOU Quan-wei wei fang-xiong SHI College of Animal Science and Technology Nanjing Agricultural UniversityNanjing 210095China

The O subfamily of forkhead box(FoxO) proteins is the downstream effector of the insulin-like growth factor-1/phosphoinositide 3-kinase/protein kinase B(IGF-1/PI3K/PKB) signal *** objective of the present study was to examine the expressions of three members of FoxO proteins,FoxO1,FoxO3a,and FoxO4 in the duodenum of Sprague-Dawley rats at different *** result demonstrated that the expression of FoxO4 in rat duodenum showed an age-dependent *** Day 21,there were no detectable localization and expression of FoxO4 in the duodenum,while,at Months 2 and 6,localization and expression of FoxO4 were *** addition,FoxO4 staining was primarily concentrated in the cell nuclei of the lamina propria around the intestinal gland of the duodenum in 2-month-old rats,but was not detectable in the same area in 6-month-old *** results showed also that although FoxO3a existed in the cytoplasm of the lamina propria at a low level at the 2-and 6-month marks,it was still not detectable at Day ***,FoxO1 was not detectable in all parts and *** together,our findings suggested that the cell-specific and age-dependent expressional patterns of FoxO4 and FoxO3a proteins in the duodenum play some roles in the development and growth performance of the rat duodenum.

关键词： O subfamily of forkhead box(FoxO) Age-dependence Duodenum Rat

Study on methanol synthesis from coal-based syngas

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Journal of Coal Science & Engineering(China) 2009年第1期15卷 98-103页

作者： MA Hong-fang YING wei-yong fang Ding-ye State Key Laboratory of Chemical Engineering East China University of Science and Technology Shanghai 200237 China

The intrinsic kinetic models of the Langmuir-Hinshelwood type were investigated in terms of the reaction rates of CO hydrogenation and CO_2 hydrogenation in theform of reactant fugacity. The parameters were estimated by the Universal Global Optimization using the Marquardt method. Residual error distribution and statistic tests show thatthe intrinsic kinetic models are reliable and acceptable. The mathematic model of a combined converter formed by gas-cooled and water-cooled reactor was developed and thegas-cooled reactor and the water-cooled reactor were characterized with one-dimensionalmathematic model. The distributions of temperature and concentration in the catalytic bedof the gas-cooled reactor and the water-cooled reactor in a combined converter with ayield of 1.2 Mt/a were simulated. The parallel cross linking pore model was used to describe the transfer process of multi-component diffusion system in the catalyst. The calculated value computed by the internal diffusion efficiency factor calculation model established for methanol synthesis catalyst fit the experimental value very well.

关键词： methanol coal-based syngas kinetics diffusion

Stability Robustness of Control System in Angular Metric

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Stability Robustness of Control System in Angular Metric