Papers by Keyword: Interference

Abstract: In order to solve the interference of CH₃COONa on measuring nitrate nitrogen (NO₃^--N) concentration by ultra-violet (UV) spectrophotometric method, a series of tests were done. The solution with different concentrations of CH₃COONa was added respectively to a set of standard solutions, which the concentrations of NO₃^--N were already known, and the interference degrees of CH₃COONa on the measurement of NO₃^- by UV spectrophotometric method were examined. The results indicated that the interference degrees of CH₃COONa on the measurement of NO₃^--N concentrations were proportional to the concentrations of CH₃COONa in the standard solutions. Based on the tests, a set of correction curves was established, and the accurate NO₃^--N concentrations can be determined by the correction curves conveniently and quickly.

Abstract: The mechanical fit between the connecting rod's small end and the bush is a typical interference fit. In this paper, an elastic-plastic finite element model of the assembly of the connecting rod and the bush is built based on ABAQUS simulation platform and simulation experiments are carried out by adopting the method of design of experiments. The magnitude of interference and the thickness of the bush are set as the test factors and the maximum radial deformation of the connecting rod’s small end hole, the radial contact pressure between the connecting rod and the bush, the plastic deformation of the bush and the fatigue strength safety coefficient of the connecting rod small end are set as the response variables. Based on the response surface equations, the multi-objective optimal approximate mathematical model is set up and the Pareto optimal set are gained and discussed.

Abstract: Environment materials play important role in our daily life. It includes so many types. NO2 is one of the most important gaseous pollutants and NO2 concentration measurement system is one part of the CEMS system. There have many NO2 concentration measurement methods and NDIR is used commonly. The received angle of the measurement light is gradually decreases while the distance between soot and the receiver becomes larger; so the true infrared light intensity is smaller than the theoretical infrared light intensity and NO2 concentration is less than the actual concentration. To reduce the soot position influence, soot position influence on NO2 concentration measurement using NDIR is studied. The influence of the different soot position is analyzed. The simulation results show that the different soot position can influent the NO2 concentration accuracy. The solution method on decreasing the soot poison influence is brought out and can improve the NO2 concentration accuracy.

Abstract: One of the pollutant emission parameters is soot emission concentration. The light intensity scattering method is commonly used in monitoring the soot emission concentration. The distance between the sensor and the soot is different; the sensor acceptance scattering light angle range of the different position multidispersion soot is different and the ratio of the soot scattering light intensity and the total light intensity is different. So it can decreases soot emission concentration accuracy. To improve soot concentration accuracy, soot concentration interference caused by the multidispersion soot different position is studied in this paper. Numerical simulation results show that the different parameters multidispersion soot position can increase soot concentration error. Solution method on the multidispersion soot different position is brought out. The interference measurement system caused by the different multidispersion soot position is designed and the experimental results show that the measurement system can on-time measure the soot position interference and decrease the soot concentration measurement error.

Abstract: In the environment research, Sulfur Dioxide is one of the most important pollutants of the stationary pollutant sources and Sulfur Dioxide emission concentration is the important parameters of EPA pollutant monitoring system in the fomer study. NDIR is the common method on measuring Sulfur Dioxide emission concentration. The monodispersion soot difference position can change the collection acceptance angle of the received system and can influent the infrared light intensity, so Sulfur Dioxide emission concentration error is increasing. To reduce the monodispersion soot position interference, the interference is studied in this paper. The monodispersion soot different angle range infrared light intensity is calculated. Numerical simulation results show that the monodispersion soot difference position can reduce Sulfur Dioxide concentration measurement accuracy. The solution method is brought out and can improve the Sulfur Dioxide concentration accuracy.

Abstract: Researches and application of ecosystem vulnerability are effective ways to guide and solve the problems of global climate change and environment sustainable development. Studies on the vulnerability assessment of coupled human-environment ecosystem under multi-scale cross become a new hot issue of vulnerability research. In this paper, different ecosystem vulnerability assessments methods of natural ecosystem, social-economic system and coupled human-environment ecosystem were systemized, the advantages of the vulnerability of the coupled human-environment ecosystem assessment were analyzed. Respectively, the types according to different interferences and scales of the coupled human-environment ecosystem were classified: on time scale, the interferences was divided into sudden and cumulative two types, and in spatial scale, the ecosystem was divided into three types: macro, meso and micro. The assessment and application of different types of interferences correspond with ecological fragility in different spatial scale were also illustrated. Finally, the insufficient of coupled ecosystem vulnerability assessment in present researches was summarized.

Abstract: When unprotected structures are nearby to CP systems, interference problems between unprotected and protected structures may be occurred. The stray current interference can accelerate the corrosion of nearby structures. During a recent few decades the protection technologies against stray current induced corrosion have been significantly improved and a number of techniques have been developed. However, there is very limited information in marine environments. In this study, cathodic protection systems installed both the ICCP with Ti-mesh anode and the SACP with zinc anode has been adopted to verify the current influence through laboratory experiment. CP potential and current have been investigated, moreover, 4 hour depolarization test has been involved to reveal the effectiveness of cathodic protection.

Abstract: In kogas paper they assume that the process of electronic get through the curvature of the square loop interference device adiabatic.Thats means the electronic will retain both dynamical spin phase and the geometrical berry phase when it get through the curvature of the interference device.But this is an ideal assumption,in the actual situation the electrons coherent state will change when it get through the curvature of the square loop interferometer. Through this papers calculation we can learn how electrons coherent state change when it get through the curvature.

Abstract: Project Moiré Interferometry system includes fringes projection system,image acquiring system and image processing system. Laser beam is changed to planar optical wave by expanded beam collimation system.The ideal grating is produced when planar optical wave passes through spatial light modulator. The emergence of light waves which include the information of grating are projected on the model surface.The fringes image modulated by the height of model surface is formed. The image is captured by image acquiring system to be processed.After the distortion brought by camera perspective transform is eliminated,the image is added with reference stripes.The Moiré fringes containing information of model surface can be obtained.Quantitative continuous data of model surface shape can be gained after fartherly image processing.

Abstract: Like in GSM network the co-channel interference (CCI) is popular in EDGE network due to the problem of reusing frequency in distant cells. Although the distance between cells using the same frequencies is quite far but CCI still causes significant effect to the channel capacity rather than noise. In fact, many solutions were introduced to reduce the CCI accompanied with improving network capacity such as using MIMO scheme or SAIC scheme. The paper describes a novel receiver model which provides better performance than that of a SAIC system as well as smaller size and cost than a MIMO system. This proposed receiver uses two co-located antennas with difference polarizations to improve the total performance of the system. In addition, this receiver can be applied effectively in high-modulation scheme, for instant, 8-PSK modulation format in an EDGE network and /or in presence of more than one dominant interference.