In order to study the influencing factors of residents' willingness to classify garbage in Harbin, countermeasures and suggestions are made according to the analysis results of the influencing factors. In this paper, questionnaire data were obtained by combining field questionnaire distribution and online questionnaire distribution in Harbin. SEM was used for correlation analysis of questionnaire data. The analysis results showed that age and income had a significant positive impact on residents' willingness to classify garbage, and older female groups were more familiar with garbage classification and more willing to conduct garbage classification. Based on the analysis results, this paper puts forward feasible suggestions for Harbin to implement the garbage classification policies.
. With the increasing complexity of electromagnetic environment and the rising of operating patterns of new radars, emitter identification is becoming more and more difficult. This paper presents a radar emitter identification method based on stacked long and short term memory (SLSTM). Radar pulse train can be directly used as input without extracting other features, which greatly simplifies the data preprocessing and realizes the "end-to-end" recognition of radar emitter signal. The timing characteristics of the pulses are automatically extracted by SLSTM, and the optimal network parameters are trained to complete radar signal identification. Compared experiments with conventional methods are conducted, and the results show that the proposed model outperforms other existing techniques. Moreover, simulation experiments in different noise and loss pulse environment show that the method is effective and robust in solving problems of radar emitter recognition.
In order to analyze the degree of people's attention to different clothing parts under the condition of clothing fit evaluation, this paper takes different fit criteria of women blouse as the research object. In this research, subjective questionnaire evaluation experiment and eye tracking experiment were conducted respectively. By analyzing the subjective evaluation results, participants have the ability to correctly evaluate the comfort of clothing and further conduct eye-tracking experimental research. Moreover, eye -tracking indexes data such as fixation duration and fixation counts of 20 areas of interest of 15 blouses with different fit degree were obtained through eye-tracking experiment. Then the mean values of eye-tracking data of different fit degree and areas of interest were compared and multivariate analysis of variance was conducted. And the heat map which can present the duration of fixation in the areas of interest was analyzed. The results showed that the total duration of fixation and the fixation counts of participants in different areas of interest were significantly different. and the degree of attention paid to the clothing parts of the women blouse was the bust, shoulder, waist and sleeve when evaluating clothing comfort with different fit criteria. This paper has scientific reference significance for improving the method of pattern making and women blouse comfort. Keyword: Eye-tracking experiment, Fit criteria, Women blouse, Fit evaluation, Area of interest.
The influence of SiO2 film on the phase velocity and the electromechanical coupling coefficient of ZnO/SiC structure was analyzed by finite element method. The results show that the middle SiO2 film layer reduces the phase velocity of Rayleigh wave and significantly increases the electromechanical coupling coefficient. When the top SiO2 film layer thickness is larger than the ZnO film thickness, the Rayleigh wave phase velocity increases. Otherwise, the Rayleigh wave phase velocity decreases. The electromechanical coupling coefficient increases first and then decreases. These conclusions can guide the development of surface acoustic wave devices with high phase velocity and high electromechanical coupling coefficient.
Enhancing energy efficiency of machine tools can significantly improve the environmental performance of machining systems, and acquisition of cutting power is the key to solve this problem. However, the approach that the cutting power is directly measured by the dynamometer can’t be utilized in real life application. In this paper, a cutting power estimation model, based on the inexpensive and non-invasive spindle motor total current and spindle idle current measurement, is proposed for the intermittent cylindrical turning operation. Novel signal processing strategies have been proposed for extracting useful features from the measured signals. Some experiments are performed on a CNC lathe HCK60 for the identification of the load meter constant and the analysis of the estimate error. As a result, it shows the effectiveness of the proposed method for estimation of cutting power, which can enhance the overall productivity of the machining process by optimally selected cutting parameters from the predicted model.
This article solves the Yu-Toda-Sasa-Fukugama potential equation in (3+1) dimension [1-4]. First of all, we carry out the traveling wave transformation on the equation. Then, the equation can be transformed into integral form. At last, we use the complete discrimination system for polynomial [5-12] to obtain all exact solutions of the equation.
During the recoil and recoil motion of the gun, the solid particles in the recoil mechanism will repeatedly impact the control ring, resulting in erosion and wear phenomenon, which has become the main cause of the failure of the control ring. By means of fluent software, a two-phase flow model based on liquid-solid coupling is established, and the motion trajectory and erosion velocity of solid particles are calculated by numerical simulation, and the influence of different parameters on particle erosion velocity is studied, which provides reference data for the simulation of controlled ring erosion and the study of wear law.
Big data analysis has brought convenience to all fields of human life. At the same time, the problem of privacy leakage follows. Protecting user's private data and preventing sensitive information disclosure become urgent problems. However, big data has the characteristics of large amount of data, diversification of types and sources and rapid growth, so the traditional privacy protection technology is more and more unsuitable. The traditional privacy protection mechanism protects the privacy of users, at the same time, it will inevitably reduce the data utility[1]. On the basis of differential privacy knowledge, based on the Nash equilibrium privacy protection mechanism, this paper constructs an interrelated differential privacy model, analyzes and evaluates the game model among multiple data publishers, and proves the correctness of the game analysis.
A frequency divider for a high speed and wide band PhaseLocked-Loop (PLL) which output frequency range is from 6 GHz to 12.5 GHz, is described. The designed mixed-signal swallow pulse divider mainly includes a divide-by-8/9 dual-modulus prescaler which is based on source coupled logic (SCL) structure for achieving high speed frequency division, and a 3-bit swallow counter and an 8-bit programmable counter to achieve wide range division ratio. This divider is fabricated in 65nm CMOS process and the power supply voltage is 1.25 V. The simulation results show that the power consumption of this divider is 5.34 mW. And the divider can achieve a continuous integer division ratio from 72 to 2047 in the PLL tuning range.
Aiming at the problem of large drag force of robot in narrow pipe space, a new type walking driving mechanism of in-pipe worming robot was proposed in this paper. The main force-exerting driving is an incomplete gear-rack mechanism, it has the characteristics of high transmission efficiency and good manufacturability. The walking principle and walking step-speed and drag force had been analyzed. When virtual prototype established the simulation experiments analysis were completed, the numerical results are in good agreement with the theoretical analysis, to a certain extent, the rationality and feasibility of the new type walking driving mechanism proposed of in-pipe worming robot had been verified, these provide the basis foundation for the manufacture of physical prototype.
Water diversion is a practical and commonly used approach to improve the water quality of rivers in urban plains in China. This paper researches using rotating overflow weirs as the primary engineering solution to facilitate water diversion and improve the water quality of the river network in urban plain area of Changzhou, including hydrodynamic modeling, field tests, and application. The water diversion scheme, including clean water source, water transfer paths, quantity, and rate, was designed based on its current terrain and river systems. The Yangtze River was selected as a high-quality water source, and its two tributaries were utilized as clean water paths. Four rotating overflow weirs were proposed to create three stages of hydraulic gradient. Clean water can flow naturally and orderly in the researched urban river network without pumps. The required clean headwater level and clean water distributions were modeled hydrodynamically. Four temporary weirs were constructed at design locations to conduct field tests. And the water diversion scheme and its water quality improvement had been verified by field tests. Afterward, four permanent rotating overflow weirs were built. Currently, the monitoring results show the design water transfer scheme reaches expectations. The flow velocity in most rivers has been increased to 7cm/s from standstill in Changzhou's main urban plain area. The composite water quality of 93% river cross-sections monitored has been improved from Class V to Class III and all have been improved to Class IV and above.
In order to upgrade the VLBI digital baseband converter of China's Deep Space Network (CDSN), a CUDA-based design method for polyphase channelized VLBI digital baseband equipment is proposed. Firstly, the parallelism of each module of the baseband conversion algorithm is analysed. Then the overall implementation structure of the polyphase channelization algorithm and the kernel of each module are implemented based on CUDA Stream. Finally, the indexes of the system are tested by simulation experiments. The results show that the system designed in this paper is flexible, simple and efficient, and can meet the requirements of CDSN VLBI system.
The resistance spot welding with intermediate frequency and direct current (RSWIFDC) was conducted to solve the weldability of the Al alloy TL091, The high-quality joint bearing dynamic load is realized for the first time by using the technique with the power of 2 kHz and the double-transformer based on the rapid response speed and stable welding current. By optimizing the welding process parameters, the strength, hardness distribution, microstructures and fracture morphologies of the joints were analyzed in details. The experimental results showed that the joints welded by the technique had better comprehensive mechanical properties, higher tensile strength and plasticity than that of the joints obtained by other spot welding. Shear fracture of the joints was seen at the nugget instead of the HAZ, thus indicating that the strength at the HAZ is higher than that at the nugget. The plastic ring of the joint was narrower as we desired. It was concluded that, by developing this advanced welding method and optimized welding parameters, high-quality joints were acquired to meet with higher design requirements of body-in-white of Al alloy under dynamic load. This is of great significance to the wide application of Al alloy body.
Soil properties directly affect the temperature change of crude oil in buried pipelines in cold regions, and clarifying soil temperature field and its influencing factors is the key to production management in gathering and transportation field. In this paper, a mathematical model for calculating soil natural temperature field was established to analyze the influence of frozen and unfrozen soil physical properties on soil natural temperature field, and to clarify the influence of soil physical properties parameters on soil temperature, delay time, freezing time and starting time of freezing, so as to provide theoretical support for thermal calculation of buried pipelines.
A connected graph G is viewed as an electrical network N by replacing each edge of G with a unit resistor. The Kirchhoff index of G is a structure-descriptor based on effective resistance of N. The generalized ladder is a subdivision graph of ladder graph. By using the properties of the Chebyshev polynomials, Laplace Theorem and so on, we obtained closed form expressions of Kirchhoff indexes for the generalized straight and generalized cyclic ladders, which generalize the results of linear quadrangular chain and linear hexagonal chain.
As an education base, colleges and universities provide a large number of excellent talents for the country and the society. Campus security is bound to be highly valued by all sectors of society. However, current campus security incidents occur frequently and often appear in the media at the first time, which is easy to arouse wide attention of the society and the government. Because of its particularity, universities will face greater challenges when security incidents occur. Taking Tsinghua University as an example, this paper discusses the construction of an information platform for comprehensive security on campus, so as to make up for the deficiencies of traditional civil air defense and physical defense, better guarantee the safety of all kinds of school personnel, and provide reference for other colleges and universities to build a comprehensive security information platform.
With respect of the gap in current "one-pull-four" tension stringing simulation calculation, a "one-pull-four" tension stringing numerical simulation model is established relying on the Ya'an II~Ziyang 500kV line project, based on ADAMS software, and the posture of walking board is discussed to obtain the influence relationship between the central deflection coefficient of the conductor and the posture of the two in this paper. In the range of small span length, the method of selecting the value of central deflection coefficient suitable for conductor steering is determined through simulation analysis of steering, which provides a basis for the actual construction of power transmission and transformation lines.
China is one of the most abundant chicken resources in the world. The local chicken breeds in the "Chinese livestock and poultry genetic resources Chronicles" have reached 107. In this paper, the nonlinear growth models have been briefly summarized and recent advances studies using Bertalanffy and Logistic Growth Curve Fitting Model in Chicken have also been reviewed. The significance and problems existing in the study of Bertalanffy and Logistic Growth Curve Fitting Model in Chicken in terms of future chicken research and breeding work were also discussed.
In order to improve the reconfigurability and computing efficiency of the polyphase channelization system, a new algorithm based on CUDA stream architecture was designed and optimized. Firstly, the principle of parallel channelization algorithm without blind zones is introduced. Then, various resource constraints under CUDA architecture and the relationship between the operating efficiency and parameters of the CUDA kernel under these constraints are analysed. The implementation structure of polyphase channelization algorithm is designed. Finally, NVIDIA GPU is used to implement and test the polyphase channelization algorithm based on CUDA stream. The result proves that the computational efficiency of the structure designed in this paper meets the real-time requirements, and can get about 10% efficiency improvement compared with the traditional algorithm.
Wireless Body Area Network (WBAN) is a new and promising wireless communication technology which consists several sensors around, on or even implant into human bodies to sense importance human physical signals. In order to erect and develop a robust WBAN, accurate modeling of the body-area network radio-propagation channel and understand the statistical characteristics in close proximity to the human body are required. In this paper, we focus on study the on-body to on-body WBAN path loss model, the environments factors are considered. The statistical parameters are extracted form measurements data, the proposed path loss model is validated through comparison with a measurement-based approach.
