|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Reductive amination of 1,6-hexanediol with Ru/Al2O3 catalyst in supercritical ammonia显示文摘Hexamethylenediamine(HMDA) is an important reagent for the synthesis of Nylon-6,6, and it is usually produced by the hydrogenation of adiponitrile using a toxic reagent of hydrocyanic acid. Herein, we developed an environmental friendly route to produce HMDA via catalytic reductive amination of 1,6-hexanediol(HDO) in the presence of hydrogen. The activities of several heterogeneous metal catalysts such as supported Ni, Co, Ru, Pt, Pd catalysts were screened for the present reaction in supercritical ammonia without any additives. Among the catalysts examined, Ru/Al_2O_3 presented a high catalytic activity and highest selectivity for the desired product of HMDA. The high performance of Ru/Al_2O_3 was discussed based on the Ru dispersion and the surface properties like the acid-basicity. In addition, the reaction parameters such as reaction temperature,time, H_2 and NH_3 pressure were examined, and the reaction processes were discussed in detail. | Yan Li Haiyang Cheng Chao Zhang Bin Zhang Tong Liu Qifan Wu Xinluona Su Weiwei Lin Fengyu Zhao | 2017 | Science China Chemistry2017，60，7： | 5 |
| 2 | Molecular architecture of the luminal ring of the Xenopus laevis nuclear pore complex显示文摘The nuclear pore complex(NPC)mediates the flow of substances between the nucleus and cytoplasm in eukaryotic cells.Here we report the cryo-electron tomography(cryo-ET)structure of the luminal ring(LR)of the NPC from Xenopus laevis oocyte.The observed key structural features of the LR are independently confirmed by single-particle cryo-electron microscopy(cryo-EM)analysis.The LR comprises eight butterfly-shaped subunits,each containing two symmetric wings.Each wing consists of four elongated,tubular protomers.Within the LR subunit,the eight protomers form a Finger domain,which directly contacts the fusion between the inner and outer nuclear membranes and a Grid domain,which serves as a rigid base for the Finger domain.Two neighboring LR subunits interact with each other through the lateral edges of their wings to constitute a Bumper domain,which displays two major conformations and appears to cushion neighboring NPCs.Our study reveals previously unknown features of the LR and potentially explains the elastic property of the NPC. | Yanqing Zhang Sai Li Chao Zeng Gaoxingyu Huang Xuechen Zhu Qifan Wang Kunpeng Wang Qiang Zhou Chuangye Yan Wusheng Zhang Guangwen Yang Minhao Liu Qinghua Tao Jianlin Lei Yigong Shi | 2020 | Cell Research2020，30，6： | 4 |
| 3 | Numerical investigation on flow nonuniformity-induced hysteresis in scramjet isolator显示文摘Numerical simulation and theoretical analysis were conducted to study the hysteresis inside scramjet isolator during the reciprocating process of back pressure variation.It is revealed that only a regular reflection is theoretically possible for two leading shocks when the inflow Mach number is greater than 2.0,and no hysteresis can occur in the transition between shock reflection types.Nevertheless,wall suction,gas injection,and background waves cause non-uniformity of the incoming flow and would make hysteresis possible.Besides the classical hysteresis in the transition between shock reflection,new kinds of hysteresis were found in both the deflection angle of separated boundary layer and the location of the shock train.Moreover,the occurrence of hysteresis in the deflection angle of the separated boundary layer is accompanied with the shock reflection hysteresis.In the case with background waves or gas injection,hysteresis in the starting position of leading shock was observed too.As back pressure decreases,the leading shock does not follow the same path as that as the back pressure increases,and it is anchored at the location where the background shock or the injection interacts with the leading shock.It is inferred that,if two strong adverse pressure gradient regions move towards and interact with each other,hysteresis will take place when they start to separate. | Tinglong HUANG Lianjie YUE Shenghu MA Qifan ZHANG Peng ZHANG Xinyu CHANG | 2020 | Chinese Journal of Aeronautics2020，33，12： | 3 |
| 4 | Wet Desulfurization of High-Sulfur Petroleum Coke Improved via Pre-calcination,H_(2)O_(2) Treatment,and Ultrasound显示文摘This work reports an improved method for the wet desulfurization of high-sulfur petroleum coke(petcoke)powder based on the combination of pre-calcination,H_(2)O_(2),and ultrasound.The results demonstrated that over 45%of the sulfur atoms were efficiently removed from Tianjin coke and Qilu coke(particle size<0.1 mm)by pre-calcination at 800℃ for 6 h followed by desulfurization with HNO3(8 mol/L)and H_(2)O_(2)(2 mol/L)solution at a reaction temperature of 60℃,a reaction time of 6 h,a liquid-to-solid ratio of 10 mL/g,and a 40 kHz ultrasonic power of 400 W.In addition,the specific surface area of the petcoke particles increased from 0.7 to 301.49 m^(2)/g.After desulfurization,the pore size distribution of the petcoke particles was more concentrated on micropores compared with the samples prior to petcoke treatment.Reactive force field molecular dynamics simulation results indicated that HNO_(3) continuously oxidized the carbon atoms adjacent to sulfur atoms in the petcoke macromolecules and promoted sulfur removal from petcoke via the cleavage of C-S bonds.The sulfur transformation mechanism can be summarized as follows:thiophene sulfur→branched chain carbon sulfur→CO_(2)S→C_(2)O_(2)S→C_(2)O_(3)NS→C_(2)O_(4)S→CO_(2)S. | Wang Gang Mao Qiuyun Liu Wei Yu Zhou Zhong Qifan | 2022 | China Petroleum Processing & Petrochemical Technology2022，24，2： | 3 |
| 5 | Spatial Pattern and Influencing Factor Analysis of Attended Collection and Delivery Points in Changsha City, China显示文摘Attended collection and delivery points are vital components of ‘last-mile logistics’.Based on point of interest(POI) data for Cainiao Stations and China Post stations in Changsha City, China, this paper provides a detailed exploration of the basic features, spatial distribution, and location influencing factors of attended collection and delivery points.Specifically, analyses of the types, service objects and location distributions of the attended collection and delivery points alongside a discussion of their spatial pattern and influencing factors provides a reference for their general geographic layout and characteristics.The findings of this study indicate that: 1) The main mode of operation of attended collection and delivery points is franchises, with other modes of operation rely on supermarkets and other individual shop types.2) The main service targets of attended collection and delivery points are communities, schools, and businesses, followed by townships, enterprises, scenic spots, and administrative units.3) Approximately 77.44% of the attended collection and delivery points are located near the exits of service areas;others are situated in the centre of the service areas.For the Cainiao Stations, 80% are located within 125 m of the exit;for the China Post stations, 80% are located within 175 m of the exit.4) The spatial distribution of the attended collection and delivery points in Changsha is unbalanced, with ‘more centre and fewer surrounding’.The centre is an ‘inverted triangle’, and the edge is an ‘orphan’, showing a northwest-southeast orientation and symmetrical along the axis.The layout of the attended collection and delivery points forms three core areas, and the number of sites decreases with the distance from the core.5) The number and distribution of the attended collection and delivery points are strongly consistent with the regional economic development level, population, and roadway system traffic convenience.Most attended collection and delivery points are on residential, scientific and educational, and commercial and financial land. | XUE Shuyan LI Gang YANG Lan LIU Ling NIE Qifan Muhammad Sajid MEHMOOD | 2019 | Chinese Geographical Science2019，29，6： | 3 |
| 6 | Research and application of on-shore power supply system for vessel in port of Shanghai显示文摘This paper prescribes a movable voltage-variable and frequency-variable on-shore power supply system which successfully provides on-shore power for container vessel on port. The high voltage power supply (10 kV/50 Hz/2 000 kVA) for the quay cranes is used for the power input of the system, after frequency and voltage converting (450 V/60 Hz), then putting out and supplying to vessel. This system is flexible with positive effect on energy-saving and emission reduction; besides, there's no requirement of civil reconstruction to container terminals, which is suitable for the busy ports in China. | Bao Qifan | 2012 | Engineering Sciences2012，10，4： | 3 |
| 7 | TGF-β1-supplemented decellularized annulus fibrosus matrix hydrogels promote annulus fibrosus repair显示文摘Annulus fibrosus(AF)repair remains a challenge because of its limited self-healing ability.Endogenous repair strategies combining scaffolds and growth factors show great promise in AF repair.Although the unique and beneficial characteristics of decellularized extracellular matrix(ECM)in tissue repair have been demonstrated,the poor mechanical property of ECM hydrogels largely hinders their applications in tissue regeneration.In the present study,we combined polyethylene glycol diacrylate(PEGDA)and decellularized annulus fibrosus matrix(DAFM)to develop an injectable,photocurable hydrogel for AF repair.We found that the addition of PEGDA markedly improved the mechanical strength of DAFM hydrogels while maintaining their porous structure.Transforming growth factor-β1(TGF-β1)was further incorporated into PEGDA/DAFM hydrogels,and it could be continuously released from the hydrogel.The in vitro experiments showed that TGF-β1 facilitated the migration of AF cells.Furthermore,PEGDA/DAFM/TGF-β1 hydrogels supported the adhesion,proliferation,and increased ECM production of AF cells.In vivo repair performance of the hydrogels was assessed using a rat AF defect model.The results showed that the implantation of PEGDA/DAFM/TGF-β1 hydrogels effectively sealed the AF defect,prevented nucleus pulposus atrophy,retained disc height,and partially restored the biomechanical properties of disc.In addition,the implanted hydrogel was infiltrated by cells resembling AF cells and well integrated with adjacent AF tissue.In summary,findings from this study indicate that TGF-β1-supplemented DAFM hydrogels hold promise for AF repair. | Qiang Wei Dachuan Liu Genglei Chu Qifan Yu Zhao Liu Jiaying Li Qingchen Meng Weishan Wang Fengxuan Han Bin Li | 2023 | Bioactive Materials2023，，1： | 3 |
| 8 | Design, Synthesis and Biological Evaluation of Isothiazole Based 1,2,4-Trizaole Derivatives显示文摘 | Lai Chen Qifan Wu Zhijin Fan Hongpeng Li Jiwei Li Wenhao Hu Xiumei Liu Nataliya P Belskaya Tatiana Glukhareva Bin Zhao | 2018 | Chinese Journal of Chemistry2018，36，8： | 2 |
| 9 | Fabrication and characterization of 3D printed biocomposite scaffolds based on PCL and zirconia nanoparticles显示文摘The application of three-dimensional printed polymer scaffolds in repairing bone defects is a promising strategy.Among them,polycaprolactone(PCL)scaffolds are widely studied due to their good processability and controlled degradation rate.However,as an alternative graft for repairing bone defects,PCL materials have poor hydrophilicity,which is not conducive to cell adhesion and growth.In addition,the poor mechanical properties of PCL materials cannot meet the strength required to repair bone defects.In this paper,nano-zirconium dioxide(ZrO2)powder is embedded in PCL material through a meltmixing process,and a regular grid scaffold is constructed by 3D printing.The embedding of nanometer zirconium dioxide powder improves the hydrophilicity and water absorption of the composite scaffold,which is conducive to cell adhesion,proliferation and growth and is beneficial to the exchange of nutrients.Therefore,the PCL/ZrO2 composite scaffold showed better biological activity in vitro.At the same time,the PCL/ZrO2 composite material system significantly improves the mechanical properties of the scaffold.Among them,compared with the pure PCL scaffold,the Young’s modulus is increased by about 0.4 times,and the compressive strength is increased by about 0.5 times.In addition,the osteogenic differentiation results also showed that the PCL/ZrO2 composite scaffold group showed better ALP activity and more effective bone mineralization than the pure PCL group.We believe that the 3D printed PCL/ZrO2 composite scaffold has certain application prospects in repairing bone defects. | Qifan Wang Zhiyong Ma Ying Wang Linna Zhong Wenjia Xie | 2021 | Bio-Design and Manufacturing2021，4，1： | 2 |
| 10 | Structure of the cytoplasmic ring of the Xenopus laevis nuclear pore complex by cryo-electron microscopy single particle analysis显示文摘The nuclear pore complex(NPC)exhibits structural plasticity and has only been characterized at local resolutions of up to 15 A for the cytoplasmic ring(CR).Here we present a single-particle cryo-electron microscopy(cryo-EM)structure of the CR from Xenopus laevis NPC at average resolutions of 5.5-7.9A,with local resolutions reaching 4.5 A.Improved resolutions allow identification and placement of secondary structural elements in the majority of the CR components.The two Y complexes in each CR subunit interact with each other and associate with those from flanking subunits,forming a circular scaffold.Within each CR subunit,the Nup358-containing region wraps around the stems of both Y complexes,likely stabilizing the scaffold.Nup205 connects the short arms of the two Y complexes and associates with the stem of a neighboring Y complex.The Nup214-containing region uses an extended coiled-coil to link Nup85 of the two Y complexes and protrudes into the axial pore of the NPC.These previously uncharacterized structural features reveal insights into NPC assembly. | Gaoxingyu Huang Yanqing Zhang Xuechen Zhu Chao Zeng Qifan Wang Qiang Zhou Qinghua Tao Minhao Liu Jianlin Lei Chuangye Yan Yigong Shi | 2020 | Cell Research2020，30，6： | 2 |
| 11 | Desulfurization of Petroleum Coke by Calcination in Ammonia Atmosphere below 1000℃显示文摘The desulfurization efficiency and mechanism of the calcination of petroleum coke in ammonia atmosphere at lower than 1000 ℃ were investigated through a series of conditional experiments and comparison with other gases such as H_2. The topics of efficiency and reaction mechanism are usually discussed through investigation by means of the Fourier transform infrared spectroscopy(FT-IR), the Brunauer-Emmett-Teller(BET) technique, and the thermogravimetry coupled with the mass spectrometry(TG-MS). Results showed that in addition to H_2, ammonia not only could retain a high desulfurization rate but could also reduce coke loss during the desulfurization process of petroleum coke. The best desulfurization conditions covered a petroleum coke particle size of less than 0.1 mm, a calcination temperature of 800 ℃ in ammonia atmosphere with a flow rate of 10 L/h, and a heating duration of more than 120 min. Ammonia decomposition, H_2 generation, decline in the activation energy of the carbon–sulfur bonds, and petroleum coke with a largest specific surface area at 800 ℃ are the key goals of desulfurization studied thereby. As proved by TG-MS analysis, given a large quantity of H_2, ammonia can be decomposed at the same temperature to completely come into contact with the sulfur species in petroleum coke to generate H_2S. | Zhong Qifan Xiao Jin Huang Jindi Yuan Jie Yu Bailie | 2016 | China Petroleum Processing & Petrochemical Technology2016，18，4： | 2 |
| 12 | Twenty-seven continental ancestry-informative SNP analysis of bone remains to resolve a forensic case显示文摘We employed our previously developed 27-plex ancestry-informative single nucleotide polymorphism(SNP)panel to infer the ancestral components of bone remains of a possible foreign pilot found in south-western China.For ancestry assignment of this unknown individual,we first obtained the 27-SNP genotype of the individual.Then,based on a reference database of 3081 individuals from 33 populations,we calculated the match probability and likelihood ratio using the self-developed software program Forensic Intelligence.Inferred ancestral components of this individual were calculated by structure at K=3.A complete profile was obtained for the individual using our multiplexed SNP assay.The European population was within one order of magnitude of the highest likelihood.The major ancestral component of this individual was 97.6%European. | Qifan Sun Li Jiang Guangfeng Zhang Jing Liu Lei Zhao Wenting Zhao Caixia Li | 2019 | Forensic Sciences Research2019，4，4： | 1 |
| 13 | Cryo-EM structure of the inner ring from the Xenopus laevis nuclear pore complex显示文摘Nuclear pore complex(NPC)mediates nucleocytoplasmic shuttling.Here we present single-particle cryo-electron microscopy structure of the inner ring(IR)subunit from the Xenopus laevis NPC at an average resolution of 4.2Å.A homo-dimer of Nup205 resides at the center of the IR subunit,flanked by two molecules of Nup188.Four molecules of Nup93 each places an extended helix into the axial groove of Nup205 or Nup188,together constituting the central scaffold.The channel nucleoporin hetero-trimer of Nup62/58/54 is anchored on the central scaffold.Six Nup155 molecules interact with the central scaffold and together with the NDC1–ALADIN hetero-dimers anchor the IR subunit to the nuclear envelope and to outer rings.The scarce inter-subunit contacts may allow sufficient latitude in conformation and diameter of the IR.Our structure reveals the molecular basis for the IR subunit assembly of a vertebrate NPC. | Gaoxingyu Huang Xiechao Zhan Chao Zeng Ke Liang Xuechen Zhu Yanyu Zhao Pan Wang Qifan Wang Qiang Zhou Qinghua Tao Minhao Liu Jianlin Lei Chuangye Yan Yigong Shi | 2022 | Cell Research2022，32，5： | 1 |
| 14 | Oligo and polyfluorene-tetheredfac-ir(ppy)3:Substitution effects显示文摘 | YAN Qifan YUE Kan YU Chao | 2010 | Macromolecules2010，43，20： | 1 |
| 15 | Unusual temperature-dependent photophysics of oligofluoene-substituted tris-cyclometalated iridium complexes显示文摘 | YAN Qifan FAN Yuanpeng ZHAO Dahui | 2012 | Macromolecules2012，45，1： | 1 |
| 16 | High-resolution linkage and quantitative trait locus mapping using an interspecific cross between Argopecten irradians irradians(♀) and A. purpuratus (♂)显示文摘The bay scallop and Peruvian scallop are economically important species.Interspecific hybrids of these two scallops outperformed both of their parent species in multiple growth traits but exhibited decreased fertility,which provides good models for the study of heterosis and species divergence.Genetic mapping serves as a chromosomal-level framework to investigate the molecular mechanisms of hybridization and introgression.In this study,high-resolution linkage maps were constructed for the bay and Peruvian scallops with an interspecific hybrid family.The linkage map of the bay scallop covered over 98.9% of the whole genome with 2994 mapped markers and the average marker interval of 0.32 cM.For the Peruvian scallop,1585 markers were mapped with the average maker interval of 0.51 cM,covering 97.7% of the genome.Both the two linkage maps have 16 linkage groups,corresponding to the haploid chromosome number of the two species.Approximately,54.5% of markers exhibited significant deviation from the expected Mendelian ratio of segregation,lending in sights into the intrinsic incompatibility between the two species.QTLs related to growth and shell coloration were detected,which could explain 13.1%and 74.9% of the phenotypic variance,respectively.This represents important information for further evaluation.These findings are an important addition to the genomic resources for scallop genetic studies,and are especially useful for investigations on genomic incompatibility for hybridization,genome evolution of closely related species,and genetic enhancement programs in aquaculture. | Junxia Mao Qifan Zeng Zujing Yang Haoyuan Pan Lijie Yao Zhenmin Bao Chunde Wang Shi Wang | 2020 | Marine Life Science & Technology2020，2，2： | 1 |
| 17 | Performance of wavelet-transform-eomain adaptive equaliz- ers显示文摘 | Wu Bingyang Chen Qifan Cheng Shixin | 2002 | Journal of Southeast University2002，18，1： | 1 |
| 18 | Enhanced Microwave Absorption for High Filler Content Composite Molded from Polymer Coated Flaky Carbonyl Irons Modified by Silane Coupling Agents显示文摘A microwave absorbing sheet with a high complex permeability and a relatively low complex permittivity is obtained by molding of the densely coated flaky carbonyl iron particles(FCIPs)by styrenebutadiene-styrene block copolymer(SBS)in the assistance of coupling agent modification.Direct molding of the core-shell FCIPs without adding extra binder results in a large permeability due to the high filling ratio(55vol%)of absorbents.Importantly,the permittivity is well suppressed by the dense insulate polymer shell on the FCIPs,avoiding the severe impedance mismatch problem of the high filler content microwave absorbing materials.Investigations show that modifying the surface of FCIPs by proper amount of silane coupling agent is critical for the coating quality of the SBS shell,which is verified by resistivity and corrosion current density measurements,and can be interpreted by improved interfacial compatibility between the modified FCIPs and SBS.The obtained microwave absorbing sheet shows a minimum reflection loss of-38.74 dB at 1.57 GHz and has an effective absorption bandwidth from 1.1 to 2.3 GHz at a relatively small thickness of 2 mm. | 崔正明 MA Guoqing WANG Mengqi LUO Chuangyu CHEN Zhihong MA Huiru LI Qifan 李维 | 2023 | Journal of Wuhan University of Technology(Materials Science)2023，38，1： | 1 |
| 19 | Performance of Wavelet Transform Domain Adaptive Equalizers 显示文摘 | Wu Bingyang Chen Qifan Cheng Shixin | 2002 | Journal of Southeast University (English Edition) (S 1003 -7935 )2002，18，1： | 1 |
| 20 | Electromagnetic shielding effectiveness of amorphous metallic spheroidal-and flake-based magnetodielectric composites显示文摘Flexible,lightweight,conductive materials,having both high rf losses and high permeability,are extremely desirable for applications as electromagnetic(EM)shielding.Gas atomized spherical FeSi-based ferromagnetic metallic particles,having a mean diameter of 14.6μm with a standard deviation of 7.3μm,were measured to have a room temperature saturation magnetic flux density of 1.49 T with a coercivity of 160 A/m.Ball milling of the amorphous particles led to aspect ratios from 1:1(spherical)to>100:1(flake-like).Flake-like particles,suspended in paraffin,were found to not only increase the surface area of fillers enhancing the polarization mechanism but also increase the complex permeability and complex permittivity,and thus provide broadband shielding effectiveness.A loading factor of 40 vol.%of the∼15μm diameter powders provided the largestΔW_(RL=-20 dB)of 9.49 GHz(i.e.,6.55 | Kun Qian Qifan Li Alexander Sokolov Chengju Yu Piotr Kulik Ogheneyunume Fitchorova Yajie Chen Chins Chinnasamy Vincent G.Harris | 2021 | Journal of Materials Science & Technology2021，，24： | 1 |
您所在的机构暂未开通此部分的功能，请联系管理员