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添加铁物类对炭分子筛性能的影响 被引量:3
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作者 朱春艳 徐绍平 郭树才 《煤炭转化》 CAS CSCD 北大核心 1993年第2期82-85,共4页
本文考察了添加铁物类对炭分子筛空分性能的影响,实验表明添加铁物类能提高炭分子筛的空分能力。初步认为这是由于在顺磁性的Fe_3O_4产生的磁场的作用下,顺磁性的O_2被Fe_3O_4吸附于表面的缘故。
关键词 子筛 空分性能 助剂
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Aerodynamic performance analysis of trains on slope topography under crosswinds 被引量:5
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作者 LIU Tang-hong 《Journal of Central South University》 SCIE EI CAS CSCD 2016年第9期2419-2428,共10页
This work used the computational fluid dynamics method combined with full-scale train tests to analyze the train aerodynamic performance on special slope topography. Results show that with the increment in the slope g... This work used the computational fluid dynamics method combined with full-scale train tests to analyze the train aerodynamic performance on special slope topography. Results show that with the increment in the slope gradient, the aerodynamic forces and moment increase sharply. Compared with the flat ground condition, the lateral force, lift force, and overturning moment of the train on the first line increase by 153.2%, 53.4% and 124.7%, respectively, under the slope gradient of 20°. However, with the increment of the windward side's depth, the windbreak effect is improved obviously. When the depth is equal to 10 m, compared with the 0 m, the lateral force, lift force and overturning moment of the train on the first line decrease by 70.9%, 77.0% and 70.6%,respectively. Through analyzing the influence of slope parameters on the aerodynamic performance of the train, the relationships among them are established. All these will provide a basic reference for enhancing train aerodynamic performances under different slope conditions and achieve reasonable train speeds for the operation safety in different wind environments. 展开更多
关键词 TRAIN WIND slope topography aerodynamic performance
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Performance analysis of an O_2/ CO_2 power plant based on chemical looping air separation
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作者 顾鹏飞 向文国 《Journal of Southeast University(English Edition)》 EI CAS 2015年第2期194-199,共6页
The process of an O2//CO2 power plant based on chemical looping air separation (CLAS) is modeled using the Aspen Plus software. The operating parameters and power consumption of the CLAS unit are analyzed. The CLAS ... The process of an O2//CO2 power plant based on chemical looping air separation (CLAS) is modeled using the Aspen Plus software. The operating parameters and power consumption of the CLAS unit are analyzed. The CLAS system, thermal power generation system and flue gas cooling and compression unit (CCU) are coupled and optimized, and the temperature and flow of the flue gas extraction are determined. The results indicate that the net plant efficiency of CLAS O2/CO2 power plant is 39.2%, which is only 3.54% lower than that of the conventional power plants without carbon capture. However, the O2/CO2 power plant based on cryogenic air separation technology brings 8% to 10% decrease in the net plant efficiency. By optimizations, the net plant efficiency increases by 1.65%. The energy consumption of the CCU accounts for 59.7% and the pump accounts for 27.1%. The oxygen concentration from the chemical looping air separation unit is 12.2%. 展开更多
关键词 chemical looping air separation O2/CO2 combustion performance analysis
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Performance Evaluation of Space-Time Spreading and Orthogonal Transmit Diversity
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作者 邬钢 许昌龙 +1 位作者 王海峰 程时昕 《Journal of Southeast University(English Edition)》 EI CAS 2002年第1期6-12,共7页
Space-time spreading (STS) and orthogonal transmit diversity (OTD) are towtransmit diversity schemes proposed by cdma2000 standard. In this paper, performance comparisonanalysis of the two transmits diversity schemes ... Space-time spreading (STS) and orthogonal transmit diversity (OTD) are towtransmit diversity schemes proposed by cdma2000 standard. In this paper, performance comparisonanalysis of the two transmits diversity schemes in multipath channel under multiuser situation arecarried out. Link level simulation in forward link cdma2000 is performed in IMT-2000 channel.Performance analysis and simulation results show that the performance improvement provided STS overOTD decreases as the increase of propagation path number and decrease of the user number. 展开更多
关键词 space-time spreading orthogonal transmit diversity CDMA2000
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CO2/CH4 separation using inside coated thin film composite hollow fiber membranes prepared by interfacial polymerization 被引量:4
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作者 Eun-Sung Jo Xinghai An +3 位作者 Pravin G.Ingole Won-Kil Choi Yeong-Sung Park Hyung-Keun Lee 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2017年第3期278-287,共10页
Carbon dioxide(CO_2) is greenhouse gas which originates primarily as a main combustion product of biogas and landfill gas. To separate this gas, an inside coated thin film composite(TFC) hollow fiber membrane was deve... Carbon dioxide(CO_2) is greenhouse gas which originates primarily as a main combustion product of biogas and landfill gas. To separate this gas, an inside coated thin film composite(TFC) hollow fiber membrane was developed by interfacial polymerization between 1,3–cyclohexanebis–methylamine(CHMA) and trimesoyl chloride(TMC). ATR-FTIR, SEM and AFM were used to characterize the active thin layer formed inside the PSf hollow fiber. The separation behavior of the CHMA-TMC/PSf membrane was scrutinized by studying various effects like feed gas pressure and temperature. Furthermore, the influence of CHMA concentration and TMC concentration on membrane morphology and performance were investigated. As a result, it was found that mutually the CHMA concentration and TMC concentration play key roles in determining membrane morphology and performance. Moreover, the CHMA-TMC/PSf composite membrane showed good CO_2/CH_4 separation performance. For CO_2/CH_4 mixture gas(30/70 by volume) test, the membrane(PD1 prepared by CHMA 1.0% and TMC 0.5%) showed a CO_2 permeance of 25 GPU and the best CO_2/CH_4 selectivity of 28 at stage cut of 0.1. The high CO_2/CH_4 separation performance of CHMA-TMC/PSf thin film composite membrane was mostly accredited to the thin film thickness and the properties of binary amino groups. 展开更多
关键词 Thin-film composite hollow fiber membrane Interfacial polymerization CHMA/TMC CO2/CH4 separation
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Direct Synthesis of Monodisperse Hollow Molecularly Imprinted Polymers Based on Unfunctionalized SiO2 for the Recognition of Bisphenol A 被引量:1
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作者 Shao-min Liu Meng-xing Wei +1 位作者 Xin Fu Xue-bin Zhang 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2018年第2期229-237,246,共10页
A novel and effective approach was developed to synthesize monodisperse hollow molecularly imprinted polymers (MHMIPs) with unfunctionalized SiO2 spheres in a mixture of toluene and CH3CN. The factors that affected ... A novel and effective approach was developed to synthesize monodisperse hollow molecularly imprinted polymers (MHMIPs) with unfunctionalized SiO2 spheres in a mixture of toluene and CH3CN. The factors that affected the synthesis of MHMIPs were systematically investigated. It was determined that a suitable ratio of toluene to CH3CN and the use of a functional monomer that can generate double H-bonding interactions were the critical factors to obtain MHMIPs with high uniformity and rnonodispersion. The obtained MHMIPs exhibited a fast adsorption rate and high adsorption capacity (270 μmol/g) for bisphenol A. As the shell thickness increased from 90 nm to 130 nm, the binding capacity of the imprinted shells decreased gradually. The relative selectivity coefficients of MHMIPs for tetra-brornobisphenol A (TBBPA), phenol and p-tert-butylphenol (PTBP) were calculated as 1.53, 1.83 and 1.90, respectively. These findings indicate that MHMIPs have good adsorption performances and suggest applications in the selective removal or sensitive analysis of bisphenol A. 展开更多
关键词 Hollow molecularly imprint Molecular recognition Nanostructured polymers Bisphenol A
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Heating and Cooling Performance of Earth-Tube Heat Exchanger in a Mechanical Ventilated Farrowing House 被引量:3
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作者 E. F. Hessel C. Zurhake H. F. Van den Weghe 《Journal of Agricultural Science and Technology(A)》 2011年第2X期187-193,共7页
Earth tempering of stable air has attracted great attention as a sustainable air conditioning method in pig houses. At summer time air cooling of income air strongly reduces heat stress and required ventilation rate. ... Earth tempering of stable air has attracted great attention as a sustainable air conditioning method in pig houses. At summer time air cooling of income air strongly reduces heat stress and required ventilation rate. At winter time heating costs can be reduced. The effect of air condition using geothermal energy was investigated in a farrowing house. Underneath the foundation of the farrowing house 88 non perforated ribbed tubes (diameter: 20 cm) were piped in a depth of 1.6-2.0 m. Over a period of 12 month following data were recorded at hourly intervals and analyzed: outside air temperature, as well as air temperature in the air supply duct and in the compartments. Incoming air (supply duct) was heated up to 20 ℃ during winter time and in summer time cooled by up to 15 ℃ compared to the outside air temperature. In contrast to the outside air diurnal variation, temperature fluctuations of the incoming air were reduced by 90%. Due to cooling of the incoming air at summer time the stable inside temperature could be limited to maximal 29 ℃(maximum outside temperature was 35℃). Earth-tube heat exchangers with non perforated ribbed tubes were very efficient for air conditioning in farrowing houses. They were a cost effective supplement for sustainable cooling and heating of farrowing houses. 展开更多
关键词 Earth heat exchanger heat stress reduction farrowing house air conditioning.
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Functional safety verification and performance measurement of train-train communication link
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作者 LIN Junting XU Qian CHEN Yong 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2021年第4期463-471,共9页
The short-range wireless communication technology has advanced considerably and provides the feasibility of train-train(T2T)communication link in the communication-based train control system.The introduction of the T2... The short-range wireless communication technology has advanced considerably and provides the feasibility of train-train(T2T)communication link in the communication-based train control system.The introduction of the T2T link would reduce the headway and improve operational efficiency.Formal methods are system design techniques that use rigorously specified mathematical models to ensure all behaviors work as expected.And it is exactly the functional safety verification needed.Therefore,to deal with the functional safety verification of the T2T link,an untimed colored petri net model is first constructed.Secondly,the verification process is performed.Conclusions can be drawn from the state space report and the computation tree logic queries.Lastly,the model is parameterized,and then data log files are obtained for further performance measurement.Results show that the proposed criteria are satisfied and there are no defects in the basic design requirements.The transmission delay has considered the reconnection,transmission errors and the interruption.The probability of the delay lower than 150 ms accounts for 98.106%,which meets the specification and the previous field test. 展开更多
关键词 functional safety formal methods colored Petri net(CPN) state space analysis performance measurement
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Separation performance of horizontal and vertical polyethersulfone hollow fiber UF modules 被引量:1
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作者 Alsalhy Qusay Fadhel 许振良 杨晓天 《Journal of Shanghai University(English Edition)》 CAS 2006年第2期173-178,共6页
The effect of hollow fiber module positions ( horizontal and vertical) on separation performance for PVA solution by using polyethersulfone (PES) hollow fiber ultrafiltration (UF) membrane with the molecular wei... The effect of hollow fiber module positions ( horizontal and vertical) on separation performance for PVA solution by using polyethersulfone (PES) hollow fiber ultrafiltration (UF) membrane with the molecular weight cut-off (MWCO) 30 000 has been discussed. Experimental results illustrated that the suitable operation conditions for PVA solution were as follows: trans-membrane pressure 2.1 bar, solution temperature 75℃ and feed velocity 0.32 m/s. Under these suitable operation conditions, the permeate flux is from 36.8 L/(m^2 ·h·bar) to 42.9 L/(m^2 ·h·bar) for the horizontal module and from 39.8 L/(m^2 ·h·bar) to 66.6 L/(m^2 ·h·bar) for the vertical module. Besides, the Separation performance of PES hollow fiber UF membrane was better by using vertical hollow fiber module than by using horizontal hollow fiber module. When the trans-membrane pressure increased from 1 bar to 2.1 bar, solution temperature from 50 ℃ to 75 ℃, feed solution velocity from 0.16 m/s to 0.32 m/s, the PVA rejection would increase from 95.8% to 99.7%, 95.4 96 to 98.6 %, 95.8 96 to 99.2 96 for horizontal module respectively, and from 98.8 96 to 99.8 %, 98.6 96 to 99.4 96, 98.5 96 to 99.4 96 for vertical module respectively. Therefore, PVA rejection in PES hollow fiber UF process was more than 98.5 96 for vertical module, and it is suitable for PVA recovery from wastewater. 展开更多
关键词 hollow fiber UF membrane POLYETHERSULFONE polyvinyl alcohol horizontal module vertical module.
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Attitude control allocation strategy of high altitude airship based on synthetic performance optimization 被引量:1
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作者 遆晓光 韩放 姚郁 《Journal of Harbin Institute of Technology(New Series)》 EI CAS 2009年第6期746-750,共5页
This paper presents a method for solving the attitude control problem of high altitude airship (HAA) with aerodynamic fin and vectored thruster control. The algorithm is based on the synthetic optimization of dynamic ... This paper presents a method for solving the attitude control problem of high altitude airship (HAA) with aerodynamic fin and vectored thruster control. The algorithm is based on the synthetic optimization of dynamic performance and energy consumption of airship. Firstly, according to the system overall configuration, the dynamic model of HAA was established and the HAA linearized model of longitudinal plane motion was obtained. Secondly, using the classic PID control theory, the HAA attitude control system was designed. Thirdly, through analyzing the dynamic performance of airship with fin or vectored thruster control, the synthetic performance index function with different weighting functions was determined. By means of optimizing the obtained performance index function, the attitude control of high altitude airship with good dynamic performance and low energy consumption was achieved. Finally, attitude control allocation strategy was designed for the airship station keeping at an altitude of 22 km. The simulation experiment proved the validity of the proposed algorithm. 展开更多
关键词 high altitude airship attitude control synthetic performance optimization control strategy
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Study of Performance on Recharging the Borehole by Means of Exhaust-air Energy
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作者 周亚素 FAHLN Per 《Journal of Donghua University(English Edition)》 EI CAS 2009年第2期126-131,共6页
In this paper,the performance analysis of recharging the borehole by means of exhaust-air energy is carried out.The results show that a vertical borehole used as heat source for a Ground Source Heat Pump(GSHP)can be r... In this paper,the performance analysis of recharging the borehole by means of exhaust-air energy is carried out.The results show that a vertical borehole used as heat source for a Ground Source Heat Pump(GSHP)can be recharged in high efficiency.With equal heat transfer capabilities of exhaust-air coil and borehole collector,the system provides a maximum overall efficiency.However,due to ground infinite capacity,the optimum brine flow rate is different from conventional two-exchanger system.The recharging system provides two peak overall efficiencies when the capacity ratio Cr=5 for laminar flow and Cr=15 for turbulent flow respectively.The overall efficiency is independent of exhaust-air temperature and undisturbed ground temperature,although the fluid properties depend on temperature.In practical system lower ethyl percentage brine should be chosen if the freezing point meets the system request,which can provide a higher overall efficiency. 展开更多
关键词 recharging BOREHOLE exhaust-air coil BRINE flowrate coil allocation ratio efficiency mathematical model
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LOFT L9-3 Experiment Simulation Using the SPACE Code
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作者 Chang-Keun Yang Yo-Han Kim Sang-Jun Ha 《Journal of Energy and Power Engineering》 2014年第10期1695-1702,共8页
The KHNP (Korea Hydro & Nuclear Power Co.) has developed a multipurpose nuclear safety analysis code called SPACE (the safety and performance analysis code) for nuclear power plants. SPACE code is a best-estimate... The KHNP (Korea Hydro & Nuclear Power Co.) has developed a multipurpose nuclear safety analysis code called SPACE (the safety and performance analysis code) for nuclear power plants. SPACE code is a best-estimated two-phase three-field thermal-hydraulic analysis code used to analyze the safety and performance of pressurized water reactors. In this paper, LOFT (loss of fluid test) L9-3 experiment using the SPACE code was selected to confirm the capability of SPACE code and the results calculated by the SPACE code are compared with those measured through the experiment. The results were compared with the experimental data and those of the other code simulations. Throughout the simulation result, it was concluded that the SPACE code can effectively simulate LOFT L9-3 experiment. 展开更多
关键词 SPACE code LOFT L9-3 ATWS.
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Performance Prediction of Structured Packing Column for Cryogenic Air Separation with Hybrid Model
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作者 张小斌 朱佳凯 +3 位作者 吴钊 熊炜 张学军 邱利民 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2014年第8期930-936,共7页
A detailed investigation of a thermodynamic process in a structured packing distillation column is of great impor- tance in prediction of process efficiency. In order to keep the simplicity of an equilibrium stage mod... A detailed investigation of a thermodynamic process in a structured packing distillation column is of great impor- tance in prediction of process efficiency. In order to keep the simplicity of an equilibrium stage model and the accu- racy of a non-equilibrium stage model, a hybrid model is developed to predict the structured packing column in cryogenic air separation. A general solution process for the equilibrium stage model is developed to solve the set of equations of the hybrid model, in which a separation efficiency function is introduced to obtain the resulting tri-diagonal matrix and its solution by the Thomas algorithm. As an example, the algorithm is applied to analyze an upper column of a cryogenic air separation plant with the capacity of 17000 m3·h-1. Rigorous simulations are conducted using Aspen RATEFRAC module to validate the approach. The temperature and composition distributions are in a good agreement with the two methods. The effects of inlet/outlet position and flow rate on the temperature and composition distributions in the column are analyzed. The results demonstrate that the hybrid model and the solution algorithms are effective in analvzin~ the distillation process for a a cryogenic structured packing column. 展开更多
关键词 DISTILLATION Cryogenic air separation Structured packings Hybrid model ASPEN
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Energy Performance Analysis of Ice Thermal Storage for Commercial HVAC Systems 被引量:1
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作者 Nabil Nassif Raymond Tesiero Nihal AI Raees 《Journal of Energy and Power Engineering》 2013年第9期1713-1718,共6页
Ice thermal storage is a promising technology to reduce energy costs by shifting the cooling cost from on-peak to off-peak periods. The paper investigates the application of ice thermal storage and its impact on energ... Ice thermal storage is a promising technology to reduce energy costs by shifting the cooling cost from on-peak to off-peak periods. The paper investigates the application of ice thermal storage and its impact on energy consumption, demand and total energy cost. Energy simulation software along with a chiller model is used to simulate the energy consumption and demand for the existing office building located in central Florida. Furthermore, the study presents a case study to demonstrate the cost saving achieved by the ice storage applications. The results show that although the energy consumption may increase by using ice thermal storage, the energy cost drops significantly, mainly depending on the local utility rate structure. It found that for the investigated system the annual energy consumption increases by about 12% but the annual energy cost drops by about 3 6%. 展开更多
关键词 HVAC system ice thermal storage central plant chiller.
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Spacial Distribution Characteristics, Activity and Degradation Capability of the Biofilm in Integrated Vertical-flow Constructed Wetland 被引量:1
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作者 J. Li X.X. Mao Z.B. Wu 《Journal of Environmental Science and Engineering》 2010年第10期57-62,共6页
The spacial distribution characteristics, activity and degradation capability of the biofilm in integrated vertical-flow constructed wetland were investigated. Results showed that the biofilm widely distributed in the... The spacial distribution characteristics, activity and degradation capability of the biofilm in integrated vertical-flow constructed wetland were investigated. Results showed that the biofilm widely distributed in the substrate of integrated vertical-flow constructed wetland and mainly in the 0-10 cm top layer where the activity ofdehydrogenase of the biofilm was also higher than that of other layers. The water quality could also affect the activity of the biofilm, for the TF(1,3,5-Triphenylformazan) amount reduced by the biofim incubated in water of the higher eutrophication was larger, too. The PCP (pentachlorophenol) removal rate by the substrate with biofilm was 1.5 times that without biofilm. In total, the biofilm of the down-flow chamber appeared larger biomass, higher dehydrogenase activity and stronger degradation capability of organic contamination than that in up-flow chamber and it was the major place for removal of the organic matters in waste water. 展开更多
关键词 Integrated vertical-flow constructed wetland BIOFILM DISTRIBUTION activity of dehydrogenase degradation capacity
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AN ENHANCED DETECTION ALGORITHM FOR V-BLAST SYSTEM
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作者 Su Xin Yi Kechu Tian Bin Sun Yongjun 《Journal of Electronics(China)》 2006年第5期773-776,共4页
A decoding method complemented by Maximum Likelihood (ML) detection for V-BLAST (Verti- cal Bell Labs Layered Space-Time) system is presented. The ranked layers are divided into several groups. ML decoding is performe... A decoding method complemented by Maximum Likelihood (ML) detection for V-BLAST (Verti- cal Bell Labs Layered Space-Time) system is presented. The ranked layers are divided into several groups. ML decoding is performed jointly for the layers within the same group while the Decision Feedback Equalization (DFE) is performed for groups. Based on the assumption of QPSK modulation and the quasi-static flat fading channel, simulations are made to testify the performance of the proposed algorithm. The results show that the algorithm outperforms the original V-BLAST detection dramatically in Symbol Error Probability (SEP) per- formance. Specifically, Signal-to-Noise Ratio (SNR) improvement of 3.4dB is obtained for SEP of 10?2 (4×4 case), with a reasonable complexity maintained. 展开更多
关键词 Multi-Input Multi-Output (MIMO) Vertical Bell Labs Layered Space-Time (V-BLAST) Maximum Likelihood (ML) detection Decision Feedback Equalization (DFE)
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Performance and Economic Analysis of Mulberry Paper Handmade Dryer by Using Downdraft Gasifier
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《Journal of Mechanics Engineering and Automation》 2013年第8期507-516,共10页
The mulberry paper handmade dryer uses downdraft gasifier, which is a continuous hot air dryer. The downdraft gasifier uses charcoal or wood chip as fuel to produce the producer gas for a dryer heat source. Two steps ... The mulberry paper handmade dryer uses downdraft gasifier, which is a continuous hot air dryer. The downdraft gasifier uses charcoal or wood chip as fuel to produce the producer gas for a dryer heat source. Two steps operation of a dryer as follows: The frst was to reduce mulberry paper pulp moisture by an air vacuum pump; the second was a continuous hot air drying process. The optimum condition drying, the capacity of dryer, the fuel consumption, the drying constant (k) and economics analysis were investigated. It was found that the first step could be to reduce mulberry paper pulp moisture content about 25% and the suitable condition drying was 80 ~C drying temperature, 0.04 kg/s air mass flow rate and 0.29 m/min chain conveyor speed, respectively. The capacity of this dryer was 20 sheets per hour. The quality of mulberry paper product was very good (based on the standard of mulberry paper community 41/2546) and the fuel consumption rate was 5 kg/h (charcoal). The drying constant was about 0.532933-0.541367 min~ and the drying constant was a function of drying temperature (T), air mass flow rate (F) and conveyor speed (10 as equation of k(T, F, V) = 0.567494 + 0.000422T- 1.40588F- 0.000205 V (R2 = 0.9254) and the breakeven point of dryer was 0.79 years. 展开更多
关键词 Mulberry paper handmade DRYER downdraft gasifier producer gas.
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褐煤制取炭分子筛
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作者 马治邦 《当代矿工》 1997年第1期19-19,共1页
由煤制取的炭分子筛是一种具有均匀孔隙结构的新型炭质吸附剂,能够筛分物质的分子,在气体分离方面有广泛的用途。 褐煤是制备炭分子筛适宜的原料煤,其主要优点:(1)煤化程度低,结构疏松,有较发达的孔隙结构;(2)挥发分含量高,受热时析出... 由煤制取的炭分子筛是一种具有均匀孔隙结构的新型炭质吸附剂,能够筛分物质的分子,在气体分离方面有广泛的用途。 褐煤是制备炭分子筛适宜的原料煤,其主要优点:(1)煤化程度低,结构疏松,有较发达的孔隙结构;(2)挥发分含量高,受热时析出的挥发性物质有造孔作用;(3)无粘结性。 展开更多
关键词 子筛 褐煤 空分性能 孔隙结构 微孔 大孔 原料煤 炭质吸附剂 挥发性物质 碳化温度
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Quantitative measurement of the mechanical properties of human antibodies with sub-lO-nm resolution in a liquid environment 被引量:1
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作者 Agnieszka Voss 《Nano Research》 SCIE EI CAS CSCD 2015年第6期1987-1996,共10页
The nanomechanical properties of single human immunoglobulin G and M antibodies were measured in a liquid environment using a fast force-volume technique with sub-10-nm spatial resolution. The ultrastructural details ... The nanomechanical properties of single human immunoglobulin G and M antibodies were measured in a liquid environment using a fast force-volume technique with sub-10-nm spatial resolution. The ultrastructural details of these molecules were resolved in the images. Simultaneously, important physical properties, including elasticity, adhesion, and deformation were measured. The dimensions and adsorption of the immunoglobulin M antibodies onto the substrate indicated that they are highly by a low elastic stiffness (34 ± 10 MPa) flexible. The antibodies were characterized and high deformability (1.5 ± 0.5 nm). 展开更多
关键词 atomic force microscopy structure and physicalproperties piconewton forces FLEXIBILITY ANTIBODIES IMMUNOGLOBULIN
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Cooperation of oxygen vacancies and 2D ultrathin structure promoting CO2 photoreduction performance of Bi4Ti3O12 被引量:9
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作者 Lizhen Liu Hongwei Huang +4 位作者 Fang Chen Hongjian Yu Na Tian Yihe Zhang Tierui Zhang 《Science Bulletin》 SCIE EI CAS CSCD 2020年第11期934-943,M0004,共11页
Reduction of CO2to solar fuels by artificial photosynthesis technology has attracted considerable attention. However, insufficient separation of charge carriers and weak CO2adsorption hamper the photocatalytic CO2 red... Reduction of CO2to solar fuels by artificial photosynthesis technology has attracted considerable attention. However, insufficient separation of charge carriers and weak CO2adsorption hamper the photocatalytic CO2 reduction activity. Herein, we tackle these challenges by introducing oxygen vacancies (OVs) on the two-dimensional Bi4Ti3O12ultrathin nanosheets via a combined hydrothermal and postreduction process. Selective photodeposition experiment of Pt over Bi4Ti3O12discloses that the ultrathin structure shortens the migration distance of photo-induced electrons from bulk to the surface, benefiting the fast participation in the CO2reduction reaction. The introduction of OVs on ultrathin Bi4Ti3O12 nanosheets leads to enormous amelioration on surface state and electronic structure, thereby resulting in enhanced CO2adsorption, photoabsorption and charge separation efficiency. The photocatalytic experiments uncover that ultrathin Bi4Ti3O12nanosheets with OVs reveal a largely enhanced CO2photoreduction activity for producing CO with a rate of 11.7 lmol g-1h-1in the gas–solid system, 3.2 times higher than that of bulk Bi4Ti3O12. This work not only yields efficient ultrathin photocatalysts with OVs, but also furthers our understanding on enhancing CO2reduction via cooperative tactics. 展开更多
关键词 CO2 photoreduction Oxygen vacancies Ultrathin nanosheets Charge separation Bismuth titanate
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