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      Volume 38,2021 Issue 5
        Research and Development
      • ZHANG Ping, XIAO Weizhou, SHEN Zhengxi

        2021,38(5):351-356, DOI: DOI:10.7535/hbgykj.2021yx05001

        Abstract:

        In order to grasp the temporal and spatial distribution of passenger flow in the rail transit more accurately,match the demand of passenger flow and the capacity of rail transportation more efficiently,and achieve the purpose of improving rail transit transportation efficiency and operation service quality,a forecast method of short-term OD passenger flow (origin-destination ) based on long short-term memory network was proposed.The temporal and spatial correlation of OD passenger flow between stations was qualitatively analyzed based on the historical passenger flow data.The influencing factors of passenger flow were analyzed by regression analysis method,and three time characteristics of operation time,operation day characteristics and minimum temperature were selected.Based on the long short-term memory network,the model was built for each OD combining with the time features to improve the forecast accuracy.Therefore,the short-term OD passenger flow forecast of rail transit based on long short-term memory network was formed.Suzhou railway transit was taken as an example to make an imitation test.The results show that compared with the moving average model and the short-term OD prediction model based on LSTM network trained only by historical data,the error between the real value and the predicted result of the short-term OD prediction model with the time characteristics is reduced by 6.27%[BFQ]~8.58%[BFQ].In short,the proposed model and the methods can provide more accurate data for rail transit operation department to make the train operation plan and organize passenger transport.

      • WANG Xiang, GUO Peixi, XIE Dongwu

        2021,38(5):357-364, DOI: DOI:10.7535/hbgykj.2021yx05002

        Abstract:

        In order to ensure the structural freeze-thaw safety of buildings in severe cold areas,the granulated blast furnace slag mixed recycled aggregate concrete with a W/C (water-cement ratio) of 47% was studied.Through multiple sets of tests,the bleeding and compressive strength of the mixed concrete were evaluated,and the freeze-thaw resistance of recycled aggregate concrete mixed with granulated blast furnace slag was analyzed.The results show that:1) when the granulated blast furnace slag content is less than 50%,its bleeding can be kept below 0.1[BFQ] cm3/cm2;2) in the filling performance test of concrete,after adding granulated blast furnace slag,the interstitial passability of the concrete is outstanding,the compressive strength is lower than that of ordinary concrete,but it has sufficient freeze-thaw resistance;3) when the mix ratio of concrete is designed in the normal strength range,granulated blast furnace slag is used to replace the broken sand( less than 50%),which has sufficient performance of bleeding,compressive strength,and freeze-thaw resistance.Recycled aggregate concrete mixed with granulated blast furnace slag can be used for engineering construction in high-cold areas,the results can effectively improve the freeze-thaw resistance of the building in high-cold areas and extend its service life,which also provide a certain reference for the preparation of freeze-thaw-resistant concrete in high-cold areas.

      • CUI Junguo, GAO Xiang, HOU Wenhui, LI Yanlong, ZHANG Jun, LU Zhongqi, SHAO Jianxin, ZHANG Xiao

        2021,38(5):365-374, DOI: DOI:10.7535/hbgykj.2021yx05003

        Abstract:

        In order to solve the problems of short transport distance,low efficiency,low safety and reliability of conventional rescue methods in flood disasters,a new crawler flood rescue platform was design to apply in urban flood disaster rescue.Firstly,the mechanical structure design was carried out,including walking,lifting,rescue equipment layout,platform corrosion and other program design;Secondly,the theoretical calculation and analysis of key design parameters was conducted,and the key structure was simulated and analyzed by using the numerical simulation.Finally,based on the designed rescue platform,the establishment of the city model,flood damage analysis model and rescue process model were proposed,the rescue path planning analysis was conducted by using the K-means clustering multi-objective optimization method,and compared with the traditional urban flood rescue,the new mode of urban flood rescue was discussed.The results show that compared to the traditional rescue,the rescue platform has greatly improved in safety,reliability,and rapidity.The rescue efficiency of the proposed new urban flood rescue mode is higher than the efficiency of the traditional rescue mode.The new crawler type flood rescue platform can be applied to rescue boat transportation,rescue material transportation and can provide emergency treatment within the disaster area,which can be used as a transit base station for stranded people in the affected area.The proposed rescue mode can effectively broaden China′s rescue methods in flood disasters.

      • FENG Zhenhua, WANG Lichao, HAN Yulong

        2021,38(5):375-381, DOI: DOI:10.7535/hbgykj.2021yx05004

        Abstract:

        In order to reduce the local deformation and instability of subgrade slopes caused by rainwater infiltration,on the basis of an overview of the model experiment phenomena,the saturated and unsaturated seepage analysis and the elastoplastic finite element analysis were used to simulate the change of water level in the roadbed slope model and the initial deformation before sliding failure.Then the progressive slope instability prediction method was established.Finally,through the reconstruction analysis of the rules with experiments,the initial deformation mechanism of the slope was clarified.The results show that:1) in saturated and unsaturated seepage simulations,when the seepage coefficient is set larger than the result of the seepage test,the reproducibility of the model experiment is good;2) in the elastoplastic finite element analysis,the deformation coefficient (stiffness) can be reduced by increasing the water level of the slope,thereby the initial deformation of the slope in the model experiment can be analyzed.The study provides a new way for analyzing the stability of roadbed slopes during rainfall,and the results can provide a reference for taking appropriate construction measures to prevent the occurrence of large-scale collapse,which is also beneficial for formulating future construction standards.[HQ]

      • KONG Zhijun, GUO Yanhui, HU Dongping, RAO Biyu

        2021,38(5):382-387, DOI: DOI:10.7535/hbgykj.2021yx05012

        Abstract:

        In order to eliminate the hidden dangers of the ecological cultural tourism scenic spots completely and promote the long-term and healthy operation of the scenic spots,based on the actual survey results and literature data of the Taoyuan Valley scenic spot in Xiaoshan Gorge,Zhenxiong County,Zhaotong City,Yunnan Province,an evaluation system including four criteria of scenic spot safety management,ecological environment safety,infrastructure,and cultural environment and 25 subordinate indicators was constructed by using the method of the analytic hierarchy process (AHP).The factors affecting operational safety risks were ranked by calculating weights,and then the safety risk level was determined by the fuzzy comprehensive evaluation method.The results show that the infrastructure of the scenic spot has a more significant impact on the operational safety of the scenic spot,followed by the ecological environment safety and safety management,and the cultural environment has the most negligible impact.In the infrastructure of the scenic spot,"[KG-*3]amusement facilities" and "[KG-*3]fire-fighting facilities" are the primary sources of risk factors for the operational safety of the scenic spot,followed by the "[KG-*3]civil engineering system" and "[KG-*3]traffic in the scenic spot",and the most important is the "[KG-*3]information exchange" in safety management.The security risk level of the overall operating system of the scenic spot is level 3,indicating that the security risks are acceptable and some need to be improved.The research results have important guiding significance for the safety operation of the scenic spots,which can effectively improve the level of emergency handling.[HQ]

      • Applied Technique
      • ZHOU Yufan, LI Shengwang, YANG Kuihe, BAI Yu, SONG Ziying

        2021,38(5):388-394, DOI: DOI:10.7535/hbgykj.2021yx05006

        Abstract:

        In order to solve the problem of low accuracy of apple surface defect detection in the field of agricultural information,a method of apple surface defect detection based on lightweight convolutional neural network was proposed.Firstly,apple defect sample images were collected to make experimental dataset for model training and testing;Secondly,on the basis of AlexNet network structure,depth separable convolution was introduced to replace the standard convolution operation in the original network to extract image features;Finally,the global average pooling method was used to replace the full connection layer in the original network,and the output feature maps of the convolution layer as a unit were mapped to get the feature points.The experimental results show that the recognition accuracy of the improved network is 98.57%[BFQ],which is 1.55%[BFQ] higher than that before;Compared with the model before improvement,the model parameters reduce by 99.3%[BFQ],training speed increases by 32.67%[BFQ],and FPS increases by 33.28%[BFQ].The improved lightweight convolutional neural network not only reduces the model parameters and training time,but also improves the detection accuracy and speed.Therefore,the new detection method can reduce the number of model parameters,as well as ensure the detection accuracy and efficiency of the model,which has strong engineering practicability and provides theoretical reference for apple defect classification.

      • JIAO Huixin, LIU Yuehui, PENG Yi

        2021,38(5):395-400, DOI: DOI:10.7535/hbgykj.2021yx05007

        Abstract:

        In order to improve the efficiency and quality of pavement construction, the asphalt concrete side mould installation machine was designed based on the side mould installation technology, and the overall design scheme of the side mould installation system was proposed. The side mould installation system was composed of a side mould exit device, an automatic hook device and a nail shooting device, among which the side mould ejection device was consisted of a positioning card, an ejection ramp slide, push blocks and air cylinders; the automatic hook device was mainly composed of magazineclip device, pushing device, hoolc device and a connecting rod structure; the nailing device was composed of air nail gun, positioning modules and three-coordinate workbench. The 3D models of the structure of each part of the side mold installation system were built by the UG software to perform virtual assembly and the rationality of the design was verified. The results show that the walking system of asphalt concrete side mould installation machine can work automatically according to the direction of the construction and the designed side mould installation system can realize the intelligentization of side mould paving, which can improve the quality of paved roads. Compared to the traditional manual paving method, the designed asphalt concrete side mould installation machine has the advantages of reliable structure, high efficiency, easy operation, good safety performance and less pollution.The research results can provide a reference for the optimization of fully automated side mould equipment in the future.Combined with asphalt paver,the system can be applied to the construction to improve pavement quality comprehensively.

      • WU Yuping, LIU Haixu, WU Jinfang, JIA Hongyan, DIAO Jia, ZHU Dongjun

        2021,38(5):401-408, DOI: DOI:10.7535/hbgykj.2021yx05008

        Abstract:

        In order to solve the low precision of damage detection using YOLOv3-Tiny network for UAV collected fan blade images,a deep learning-based damage detection algorithm was proposed.Firstly,a leaping feature joint network structure was proposed,which was composed of a convolutional layer and a splicing layer.The feature information of different depths was fused and learned to extract the information of the target multi-level feature.Secondly,the inception module structure was introduced,and the input feature maps were compressed by multiple convolution kernels with 4 parallel channels,which reduced the learning parameters of the network and better characterized the image feature information.Then the detection accuracy of small targets was improved.Experiments show that the detection accuracy of the improved algorithm is increased by 2.69%,the mAP reaches 88.58% in the self-made dataset,and the parameters of the model are reduced by 4 times.The detect precision of this method is better than that of YOLOv3-Tiny network in the task of wind turbine blade damage detection.The results provide reference for image-based damage detection and intelligent identification work of fan blade damage.

      • WU Hanxiao, REN Youzhi, HU Tao, PANG Caizhu

        2021,38(5):409-413, DOI: DOI:10.7535/hbgykj.2021yx05009

        Abstract:

        In order to solve the problem that a large amount of waste water was discharged in the working process of the RO filter element of the existing composite water purifier and resulted in the waste of water resources,a water-saving system of the water purifier was designed.Firstly,the water purification system was multistaged and was composed of pretreatment filter element,RO filter element and post-treatment filter element;Then,different levels of filtered water were distributed according to the water quality;Finally,the waste water recycling system was designed to recycle the waste water;In addition,a flushing branch was designed to flush the RO filter element regularly.The working status of water purification devices,water purification parameters,filter element replacement reminder and other information were displayed through the designed human-computer interaction panel.The operation results show that the designed water-saving system of water purifier improves the utilization rate of domestic water through reasonable distribution of different levels of filtered water;Under the condition of stable water production rate,the waste water recovery rate of the water purifier is more than 90%,and the service life of the filter element is prolonged by washing and scaling regularly.The designed water-saving system of water purifier can effectively solve the problem of water resources waste,and avoid the increase of cost caused by waste water discharge and frequent replacement of filter element,which is very suitable for family use.The design result has good commercial value,and has a certain reference value for water-saving research of water purifier.[HQ]

      • Special Column on Research and Development of Drugs
      • JING Wenguang, ZHANG Quan, CHENG Xianlong, SHI Jia, MA Shuangcheng, WEI Feng

        2021,38(5):414-422, DOI: DOI:10.7535/hbgykj.2021yx05010

        Abstract:

        In order to explore the processing mechanism connotation of the decreased irritation of ginger Magnoliae officinalis cortex,the combination of electronic nose and electronic tongue technology was used to quantitatively determine the taste and odor of 15 batches of Magnoliae officinalis cortex materials,15 batches of Magnoliae officinalis cortex and 15 batches of ginger Magnoliae officinalis cortex before and after processing.The paired sample t test and principal component analysis were carried out to analyze and compare the taste and odor changes of Magnoliae officinalis cortex before and after processing.The results show that only the astringency in the taste is reduced after ginger processing,with significant difference (P<005);while the astringency sensor of the electronic tongue responds to the taste caused by astringent substances,and it is perceived as pungent aftertaste at low concentrations,indicating that the irritation is reduced after ginger processing.At the same time,the measured values of nitrogen oxide and sulfide sensors in electronic nose also decrease after processing,which implies the decrease of volatile components can reduce the irritation of Magnoliae officinalis cortex.The results indicate that the electronic tongue and nose can be used to investigate the mechanism of Magnoliae officinalis cortex and "[KG-*4]Without ginger processing,the mouthpiece will be thorny" has certain scientific rationality.

      • KOU Na, WANG Yue, ZHANG Yongbo, XU Dong

        2021,38(5):423-430, DOI: DOI:10.7535/hbgykj.2021yx05011

        Abstract:

        In order to analyze the research hotspots,frontier and development trends of inhalation administration,the relevant literature of inhalation administration from 2011 to 2020 in the Web of Science database was studied by using CiteSpace software.According to the analysis of the cooperation network between countries and institutions,the co-occurrence network of keywords and the co-citation network between literature and journals,the 2 580 related literatures were retrieved.The results show that:1) the annual average number of relevant papers in the field of inhalation administration issued increases year by year during the period of 2011—2020,which indicates that researchers have paid more attention to this field.The countries that published a large number of documents are the United States,China and Japan.High-yield institutions include Sydney University and Okayama University,etc.The journals with the most publications and citations are AM J RESP CRIT CARE and NEW ENGL J MED;2) according to the keyword analysis and literature co-citation analysis,the research hotspots include asthma,respiratory distress syndrome,cystic fibrosis,obstructive pneumonia disease,acute lung injury and other related diseases in this field,as well as the research and development of the inhalation formulation.The relationship between inhalation exposure of harmful substances and inhalation administration has become the recent frontier of research in this field.The research results provide reference for the further study of inhalation administration and the treatment of lung diseases.[HQ]

      • SHI Xueli, GAO Hui, ZHOU Yonghong, ZHAO Wei

        2021,38(5):431-437, DOI: DOI:10.7535/hbgykj.2021yx05005

        Abstract:

        In order to determine the content of 17β-estradiol (E2) in milk sensitively and specifically,and solve the problems such as the interference of fluorescence background caused by in-situ excitation and the complexity of sample pretreatment in the traditional method,a quantitative analysis method for 17β-estradiol based on fluorescence aptasensor was constructed on grounds of the fluorescence resonance energy transfer (FRET),combined with the specificity of the aptamer and target recognition.Persistent luminescence nanoparticles (PLNP) doped with Eu3+ were prepared by the hydrothermal method and modified with E2 aptamers onto PLNP to form the coupling complex PLNP-Aptamer.In this method,PLNP-Aptamer was used as energy donor.MoS2 was used as the acceptor.According to the linear relationship between phosphorescent intensity and target E2,the content of E2 was detected,and the detection conditions were optimized.The results show that when the concentrations of PLNP-Aptamer and MoS2 are 0.[BFQ]1 mg/mL and 0.[BFQ]8 mg/mL respectively,the reaction time of E2 and aptamer is 20 min,pH is 7.[BFQ]0,the linear detection scope of E2 concentration is from 0.[BFQ]6 ng/mL to 80 ng/mL and the detection limit is 0.[BFQ]4 ng/mL.The adding standard recovery experiment proves that the detection system has high specificity to E2,and can realize quantitative detection of E2 in actual samples.The method provides a simple,efficient and low-cost estrogen detection method for grass-roots health supervision by solving the problem of the complicated time-consuming of sample pretreatment and avoiding the fluorescence interference of milk matrix.It also provides a reference for other environmental estrogens detection.

      • LI Yujie, XIAO Tianyu, MA Yunqing, WANG Ruifei, KANG Wenhuai, QIN Ling

        2021,38(5):438-444, DOI: DOI:10.7535/hbgykj.2021yx05013

        Abstract:

        In order to compare the aroma components of two dried mulberries,the DB-wax column and HP-5 column were compared to analyze the separation effects of volatile components with the materials of "[KG-*4]DaShi" and "[KG-*4]White Pearl" dried mulberries.The extraction conditions of headspace solid-phase microextraction (HS-SPME),such as extraction temperatures (40,45,50,55,[BFQ]60 ℃) and extraction time (20,30,40,50,60[BFQ] min) were optimized.The results show that with the conditions of the optimized extraction temperature of 45 ℃ and extraction time of 40 min,the analyze results of the DB-wax chromatographic column are better.51 kinds of aroma components are identified in "Dashi" mulberry,mainly including terpenes,acids,aldehydes and ketones,alcohols and esters,accounting for 31.9%,22.9%,19.8%,6.7% and 5.7%[BFQ] of the total identified substances,respectively;46 kinds of volatile components are identified from “White Pearl” dried mulberry,mainly including acids,aldehyde,ketone,ester,alcohols and terpene,accounting for 38.9%,27.4%,9.7%,8.2% and 1.9%[BFQ] of the total amount respectively.There are significant differences in aroma types and relative contents between "[KG-*4]Dashi" black mulberry and "[KG-*4]White Pearl" white mulberry.D-limonene,butyric acid,benzaldehyde,hexanoic acid,γ- terpinene and nonanal are relatively high in the dried mulberry of "[KG-*4]Dashi".Among them,the content of D-limonene is as high as 233%.The relative high contents of aroma substances in "[KG-*3]White Pearl" mulberry are hexanoic acid,benzaldehyde,butyric acid,2-Methylbutyric acid,ethyl hexanoate,nonanal,etc.The research results provide a scientific basis for the aroma detection,the fruit processing and the variety breeding of mulberry.[HQ]

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      Volume 38,2021 Issue 5
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      • Design of stroke treatment and remote monitoring system

        张雪芹, 叶志明, 孟凡利, 刘华波

        Abstract:

        In order to meet the needs of home-based rehabilitation treatment and recurrence Pre-warning monitoring of discharged stroke patients, the home-based stroke treatment and remote monitoring system integrating treatment, human physiological signal acquisition and data analysis, Pre-warning and other functions is designed. Firstly, the therapeutic instrument is designed based on transcranial direct current stimulation technology to output constant and accurate direct current. Secondly, the smart bracelet is developed as an auxiliary monitoring device to record the patient's heart rate and other data in real time and sends the data to the mobile APP through Bluetooth. Finally, the treatment records and vital signs data of patients are uploaded to the cloud database through mobile APP for further analysis, which is used to adjust the treatment plan or Pre-warning of stroke recurrence. The design results show that the system not only meets the needs of rehabilitation treatment of stroke patients, but also the stimulation current control accuracy index of the therapeutic instrument is better than that of foreign equipment. At the same time, the interconnection between cloud and equipment is realized, which has important practical significance in the home treatment of stroke patients.

        • 1
      • Store sales forecast based on stacking model fusion

        曹丽惠, 阮冬茹

        Abstract:

        Sales forecast in modern enterprises is the core link of goods supply. It is essential for reasonable control of production costs, arranging the production plan of goods, and adjusting the inventory of goods. It is an important reference for marketing, logistics, production and other links. In order to effectively use the historical sales data of enterprise stores and provide data support for enterprise decision-making, based on the Stacking model fusion algorithm, RF(Random Forest), SVR(Support Vector Regression), ARIMA(Autoregressive Integrated Moving Average), LGBM(Light Gradient Boosting Machine), GRU (Gated Recurrent Unit) five single models are primary learners, CART (Classification And Regression Tree) Is a fusion model of secondary learners, which predicts the product sales of enterprise stores. The experimental results show that the model fused with the Stacking model is compared with the LGBM model with the best effect in the single model. The RMSE (root mean square error) is smaller, the MAE (mean absolute error) is smaller, and the R2 (coefficient of determination) value is larger, indicating that the prediction accuracy of the Stacking fusion model is higher, and it has a certain practical reference value for corporate decision-making.

        • 1
      • NIR Phosphorescence Turn-on Aptasensor for Determination of 17 β - Estradiol

        史学丽, 高辉, 周永红, 张毅, 赵伟

        Abstract:

        The sensing was based on the inhibition of fluorescence resonance energy transfer (FRET) between an aptamer conjugated NIR persistent luminescence nanoparticle (PLNP) and molybdenum disulfide (MoS2) nanosheets by the target 17β-estradiol. The sensitivity, accuracy and linear range of the phosphorescent sensor were investigated by measuring Ph, incubation time and MOS2 concentration. Using this approach, 17β-estradiol concentrations from 0.5 ng·mL-1 to 1.2μg·mL-1 were quantified from 0.5 mL samples. Within-run and total imprecision ranged from 5.9% to 12.1%, respectively. Selectivity is comparable to a traditional (High-performance liquid chromatography or GC) benchmark in quantitative results. In addition, 20 minutes of UV extraction and 30 minutes of camera obscura preservation were saved by collecting near-infrared phosphorescent signal immediately after the reaction of Aptamer and target. Finally, the operating procedure and signal intensity were improved without the interference of fluorescence of milk matrix and its analogues, and the system showed a significant selectivity for 17β-estradiol analogues. Our system exhibited remarkable selectivity toward 17β-estradiol over several analogues and was applicable in complicated food samples such as diluted milk .

        • 1
      • Research on development Countermeasures of Clothing Live Broadcast Marketing based on consumer perception

        黎锋, 刘雅玲

        Abstract:

        With the rapid development of live broadcast marketing in recent years, live broadcast marketing has further become the new favorite of major clothing brands during the epidemic period. However, while the major clothing brands are conducting live broadcast marketing, various problems are gradually exposed, such as: unprofessional anchors, incorrect goods of clothing products, different goods of the same style, poor interactivity, single live broadcast form, low user stickiness, lack of after-sales service and other problems. This paper will make an in-depth analysis of the problems such as low user stickiness and poor experience in the operation process of clothing live broadcast marketing through questionnaire survey, based on consumer perception and combined with relevant literature. In this paper, the optimization strategy of clothing live broadcast marketing will be proposed from the three aspects of clothing merchants, live broadcast platform and consumers, aiming to provide consumers with a more professional, interesting and quality-assured clothing live broadcast marketing experience service, promote the further development of the clothing industry, and achieve a win-win situation for consumers and merchants.

        • 1
      • Automatic vehicle path tracking control based on model predictive contouring control

        潘公宇, 刘一

        Abstract:

        Based on model predictive contouring control, a curve path tracking control strategy is proposed for driverless car curve and obstacle avoidance scenarios. Firstly,Sthe two degree of freedom single vehicle model and the Pacejka tire model together to build the vehicle model, and then follow the contour control combines the vehicle model, path planning and tracking problem for a nonlinear optimization problem, linear time-varying model, are obtained by linearized at each sampling time in the form of a convex quadratic programming in establishing local approximation of nonlinear optimization problem. Meanwhile, In order to keep the vehicle stable while following the path, the stability constraint is applied in combination with the vehicle stability envelope. Moreover, by applying lane boundary constraint, the obstacle avoidance function of the autonomous driving vehicle is realized. Finally, MATLAB/ Simulink and CarSim are combined to carry out the co-simulation, which shows the effectiveness of the proposed path tracking strategy.

        • 1
      • The law of diffusion and migration of oil spilled from submarine pipelines under wave action

        王驰, 梁法春, 何振楠, 赵峰辉, 王梦琦

        Abstract:

        In order to solve the serious environmental pollution and economic losses caused by the oil spill accident of the underwater oil and gas pipeline and to better meet the actual needs of the project, in view of the large calculation error caused by the current model without considering the wave conditions, a two-dimensional windy model with waves was established using fluid mechanics software to predict the oil spill process. The simulation results were compared with Fan's experimental values to verify the reliability of the model. The model was based on the VOF(volume of fluid ) method , combined with the SST k-ω turbulence equation and PISO algorithm, to study the effects of density, wave length, and wind speed on oil spills. The research results show that densityl significantly affects the time to sea level and the lateral drift distance of oil spill. The wave length has a slight effect on the ascent speed of oil spill, mainly affecting the lateral spread. The wind speed has almost no effect on the process before the oil spill reaches sea level but accelerates the spreading process after arrival.The research results can provide a reliable basis for the formulation of oil spill accident treatment plans and oil spill recovery and utilization.

        • 1
      • Ownership structure and effectiveness of internal control——A case study of listed companies in the real estate industry

        曹慧, 张婧

        Abstract:

        As economic globalization brings huge economic opportunities to enterprises, it also brings unprecedented competitive pressure, and higher effectiveness of internal control can enhance the core competitiveness of enterprises. The case study can more truly describe the situation of the case, and effectively provide easy-to-understand explanations for other similar cases. Meanwhile, the conclusions obtained also provide reliable reference basis for other similar cases. Therefore, through the case study of five listed real estate companies, this paper discusses the influence of the equity structure and the nature of checks and balance shareholders on the effectiveness of internal control from the horizontal and vertical aspects, and draws a conclusion: the effectiveness of the company's internal control with equity checks and balance is better than that of a single dominant company; When there are state-owned checks and balance shareholders, compared with state-owned companies, non-state-owned companies have better internal control quality. When the checks and balance shareholders are non-state-owned, the company's internal control is more effective.

        • 1
      • Design of panel forming device for purification partition board

        张嘉钰

        Abstract:

        Aiming at the problems of semi-automatic production of panel forming in the production process of purification partition board, such as low efficiency, high dependence on production workers' skills, and difficulty in quality and loss control, a full-automatic panel forming device is designed, which realizes the automatic forming of panel by using the feeding mechanism, leveling mechanism, punching mechanism, forming mechanism and cutting bending mechanism. It greatly improves the forming efficiency, forming quality and reduces the labor intensity of workers. The design of the device conforms to the development trend of automatic and unmanned purification partition board production, and has high market value.

        • 1
      • Design of Robot for Automatic Oiling of Air Conditioning Connecting Rod

        朱金达, 刘庆磊, 邓飞, 牛虎利, 高思齐, 刘兆奂

        Abstract:

        In order to solve the problems of existing air conditioning connecting rod oiling, such as over coating, less coating, missing coating, uneven painting, low efficiency and high cost, an automatic oiling robot for air conditioning connecting rod is designed. Based on the idea of three-axis design and precise positioning, the overall design scheme of gantry type three-axis oiling structure and mold box auxiliary positioning is proposed. The control system adopts Siemens S7-200 smart, designs PLC hardware wiring diagram, uses EM253 position control module to control stepping motor, and combines sensor and touch screen human-computer interaction interface to realize automatic oiler control. The motion simulation analysis of air conditioning connecting rod automatic oiling process is carried out with UG. The results show that the robot greatly improves the efficiency of oiling and reduces the labor intensity of workers; the efficiency of automatic oiling is about 4.83 times of that of manual oiling; the equipment has the advantages of strong stability, simple structure and high degree of automation, which conforms to the development trend of automation, and provides a new solution for oiling other small parts.

        • 1
      • Analysis of axis offset of clamped rebar

        牛虎利, 郑祖威, 王渊, 张嘉钰

        Abstract:

        Rebar belongs to irregular workpieces, and the deviation of rebar axis in the clamping process will eventually lead to machining errors. This paper analyzes the causes of axis offset when two - jaw chuck and three - jaw chuck are clamped on the workpiece. The mathematical model of the deviation of the rebar axis when the rebar is clamped with two claw synchronous chucks and three claw chucks is established. The mathematical model was solved by MATLAB, and the variation range of the deviation value of the rebar axis when the v-block Angle was 60°, 90° and 120° respectively when the two-jaw synchronous chuck clamped the rebar and the deviation value of the rebar axis when the three-jaw chuck clamped the rebar was obtained. The results show that, compared with the other two kinds of two-jaw synchronous chucks with v-block Angle of 90°, the deviation range of the rebar axis during clamping is the smallest, ranging from 0 to 1.59mm. When the three-jaw chucks are clamping the rebar, the deviation range of the rebar axis is 0.14-1.34mm.

        • 1
      • An improved detecting algorithm of weak signals based on polarization-sensitive array

        徐少波, 张丹, 宋肖, 李新亮, 张明程

        Abstract:

        Aiming at the problem that the Global Navigation Satellite System (GNSS) is confronted with great challenges in terms of continuity, integrity and usability due to the complex electromagnetic environment, an improved signal detecting algorithm of weak interference based on polarization-sensitive array was proposed. Through the joint-processing in space, frequency and polarization domain of the real-time data received from antenna elements and the descending processing of the eigenvalues in each frequency bin, the distribution curve of eigenvalues in whole frequency domain can effectively separate and identify the weak signals. And even the realization power and computational complexity were reduced through the improved MDL criterion based on multistage wiener filter, as the step of eigen-decomposition was omitted. Simulation results demonstrate the efficiency and validity of the proposed method, and the detecting results still keep highly effective even with amplitude and phase errors, thereby it has high engineering practice value.

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      Volume 38,2021 Issue 5
        Special Column on Pollution Prevention and Control
      • YANG Lili, FENG Yuan, ZHOU Jingbo, HE Linyan

        2015,32(1):85-89, DOI: 10.7535/hbgykj.2015yx01015 

        Abstract:

        In order to analyze haze change regularity and the origin of the haze weather and provide technical support for its prevention, the correlation between the haze and meteorological condition and pollutants concentration are discussed based on the surface meteorological observation data and the pollutants concentration monitoring data from the step station of Shijiazhuang environmental monitoring center. It is proved that the haze days during the 1960s is minimal; the haze days rises sharply during the initial stages for reform and opening-up and the 1990s; the haze days obviously decreases after the 2000s.The haze occurs more frequently in autumn (20.5%) and winter (53.5%), and less in spring(15.2%) and summer(10.8%). Quiet wind, lower humidity and continuous no-rain days are the important causes of the haze. The mass concentration change regularity of SO2, NO<i>x, PM2.5 and PM10 (the correlation coefficients are 78.4%,70.9%,77.3% and 73.8%, respectively) is coherence with the haze days of Shijiazhuang City. Their mass concentration is obviously higher in haze days than in the normal days. Their mass concentration is highest in winter, lower in autumn and lowest in summer.

      • DU Jia-ying, SHANG Hui-jian, XU Bao-yun, ZHENG Xue-ming

        2005,22(1):52-54, DOI: 10.7535/hbgykj.2005yx01016

        Abstract:

        Po lyv inyl Alcoho l ( PVA) is w ater??soluble polymer , and no n??t ox ic t o human body. It has go od bio??compat ibility, so PVA develops rapidly in medical t reatment . Develo pment in the study o f PVA, including adv ance of PVA hydro??gel in eye, wo und dr essing s and art ificial car tilag e, and application o f PVA member in medicine and so o n are intro duced in det ail in t he re?? v iew

      • 综述与述评
      • CHANG Hong-fei, YANG Zhen

        2008,25(4):262-269, DOI: 10.7535/hbgykj.2008yx04022

        Abstract:

        To provide a foundation for further study on Huanglianwendan decoction and its possible clinical applications,this paper reviewed the recent 10years'' literatures about its clinical studies, including those on treating psychosis, digestive system disease, decompensation disease, chronic renal failure disease, curdiovascular, and otorhinolaryngology disease.

      • Research and Development
      • YIN Xin, ZHANG Jianrong, XU Guodong, WANG Haiwen

        2015,32(1):1-7, DOI: 10.7535/hbgykj.2015yx01001 

        Abstract:

        Antimony-doped tin dioxide is an excellent catalyst, which has good electrical conductivity and high temperature stability. The sol-gel method is used to prepare ATO nanopowders, and their structure characterization and performance analysis are also conducted. Stable tin and antimony citrate complexes solution is obtained from the starting materials metal tin and antimony trioxide. The solution undergoes sol-gel transformtion when acetonitrile is added dropwise. Antimony doped tin oxide nanoparticles are obtained with the washed gel heat-treated at different temperatures. The antimony doped tin oxide nanoparticles exhibit shrinking crystallite size, increasing specific surface area and tin oxide lattice parameters changing with the rise of antimony doping content. The crystalline size increases, while speciflc surface area decreases with the increase of annealing temperature. The particle crystallinity shows a decrease tendency for the high antimony doping level with increasing temperatures.

      • 综述与述评
      • BIAN Wei, WANG Lu-guang, LI Hong-bo

        2009,26(3):195-199, DOI: 10.7535/hbgykj.2009yx03018

        Abstract:

        This article summarized the physical chemistry and biological treatment technologies of high salinity organic wastewater and introduced combined processes of biological and other treatments. Halophilic bacteria and salt-tolerant microzyme have wide practicability in the treatment of highsalinity wastewater.

      • HU Shi-hai

        2009,26(1):58-60,64, DOI: 10.7535/hbgykj.2009yx01016

        Abstract:

        This paper introduced the production process and application of pentaerythritol and analyzed its market situation.Then the paper pointed out the problems unsettled and gave some advices.

      • SHANG Qing, ZHENG He-tang, YAN Li, SHI Yong-li

        2005,22(1):38-43, DOI: 10.7535/hbgykj.2005yx01013

        Abstract:

        Po lymer nano par ticles as drug car rier sy st ems is a new kind o f drug deliver y sy stem. It is easy to get to site- specific throug h bio film bar rier fo r the nanoparticles. Po lymer nanopart icles hav e new characterist ics fo r multifo rmity of polymeric mater ial, so po lymer nano par ticles em ployed as drug carr iers hav e att racted attention. In this r ev iew , the tw o prepa rativ e methods for dispersio n of the pr eformed po lymer s and polymerization o f mo nomers are ex pounded, t he measur ing metho d of particles d-i ameter , modality, moleculer w eight, Zeta po tent ial and thermic perfo rmance are investig ated, and the applicatio ns are discussed. At last are the sug g estions o n development t rend fo r polymer nanoparticles as drug car rier

      • YU Xue-yin, CAO Tuo-huang, CHEN Ben-sheng

        2009,26(5):428-430,433, DOI: 10.7535/hbgykj.2009yx05017

        Abstract:

        Face recognition is a technique used for identify identity by analyzing face images and distilling effective recognition information from face images. This article presented an arithmetic of face recognition based on eigenfaces, gave the explaination of eigenface,and made a simulation of DRL face database by using program baced on OpenCV. This method recognizes and classifies face images by computing the space distance between face image and eigenfaces,and it can recognize face image quickly and exactly.

      • 综述与述评
      • YANG Li-yan, SHANG Hui-jian, WANG Liang, ZHENG Xue-ming

        2010,27(3):210-212, DOI: 10.7535/hbgykj.2010yx03017

        Abstract:

        This paper introduced the widespread use of acetonitrile as a good organic solvent and an important raw material in the field of chemical industry, medicine and so on, and gave a summary report about some direct and indirect synthesis methods in regard of the properties of acetonitrile. Then the potential application prospect and synthetic method of acetonitrile were put forward.

      • 应用技术
      • DOU Hong, ZHANG Xiao-xin, GAO Chun-ping

        2009,26(2):90-94, DOI: 10.7535/hbgykj.2009yx02006

        Abstract:

        This paper investigated the feasibility of detecting Sudan Red in foods with thin layer chromatography, and compared the result of Sudan Red separation with high-effect silica gel G plates (HPSGG) and the result of it with polyamide plates. It is found that HPSGG has more advantages over polyamide plates in separating Sudan Red. HPSGG gives high detection sensitivity, up to 0.3mg/ kg, fast analysis and clear separation. Polyamide plates needs 40minutes while high-effect silica gel G plates needs only 5~10minutes. The Sudan pigments and other interference pigments such as pepper pigments,can be completely separated. The method can be applied to rapidly detect Sudan Red illegally added in foods such as chilli products and hamburgers.

      • LEI Li-gai, MA Xiao-zhen, WEI Fu-xiang, WANG Zhan-hui

        2011,28(1):72-76, DOI: 10.7535/hbgykj.2011yx01019

        Abstract:

        This paper summarized the methods of the measurement of total nitrogen, the measurement of total phosphorus and the combined measurement.It compared the merits and demerits of these methods and put forward the development trend of the measurement methods.

      • CHENG Zhong-hao

        2005,22(5):281-284,288, DOI: 10.7535/hbgykj.2005yx05011

        Abstract:

        A br ief intro ductio n to DNP3. 0 ( Distr ibuted Netwo rk Pr oto co l 3. 0) is presented at this paper to gether w ith an explanation o f t he architecture and functio nality pr ovided by this prot ocol. An appr oach to implement the pr oto co l that ado pts the OOP and the VCL component techniques in the Delphi prog r amm ing envir onment is discussed

      • 研究与开发
      • XU Bing-wen

        2011,28(5):302-305, DOI: 10.7535/hbgykj.2011yx05006

        Abstract:

        Based on sixsigma,the software process defects management model is established. The model combines the method of six sigma to provide effective solution for software process defects management. The model can get better quality and better customer satisfaction by optimizing the software development process, tracking adverse factors and eliminating defects.

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