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Online since: July 2013
Authors: Yu Kun Huang
System Design ZigBee technology ZigBee technology is a short-range, low-complexity, low-power, low-data-rate, low-cost wireless communication technology, using the 2.4 GHz band, using frequency-hopping technology, in line with the IEEE802.15.4 protocol [9].
The main features of the technology: 1) The data transfer rate is low; 2) in the low-power standby mode, two ordinary No. 5 dry cell can be used from 6 months to 2 years; 3) protocol, and waive royalties can greatly reduced cost; 4) network capacity, each ZigBee network can support up to 255 devices; 5) 10 ~ 5 000 m, based on the transmission power of the size and variety of application modes may be effective coverage; 6) The use of the frequency band of 2.4 GHz, 868 MHz (Europe) and 915 MHz (USA), are unlicensed band.
Fig. 1 Schematic Diagrom of the System Structure Fig. 2 Layout of the system Soil moisture monitoring regional area is 20m × 15m; 12 irrigation control points, respectively, laid in the field support tube at each irrigation CPU control two electromagnetic valve of switching action and collecting electromagnetic valve switch state signal; relay station laid in the 2nd irrigation CPU controlpoint forward central station instruction and field electromagnetic valve control point; automatic weather station weather data sent to the management center station through wired communication (RS-485); first control station for inverter control pumping stations, throughmanage ZigBee receive the instructions of the central station, the implementation of the precise control of the water supply movements and traffic.
The study shows that, to establish intelligent irrigation system based on Internet of Things technology to reduce the cost of the system cost reduction of 44.8%, compared with traditional irrigation methods, crop water use efficiency of 22.6%, compared with the similar foreign products.
Reference [1] Yang Wei, Li Minzan, Wang Xiu (2008) Status quo and progress of data transmission and communication technology in field information acquisition Transactions of the Chinese Society of Agricultural Engineering 24(5):297-301 [2] Bao Changchun, Shi Ruizhen, Ma Yuquan, et al (2007) Design and realization of measuring and controlling system based on ZigBee technology in agricultural facilities Transactions of the Chinese Society of Agricultural Engineering 23(8):160-163 [3] Yang Fengliang, Jiao Xiyun, Liu Yixiu, et al (2010) Layout of soil moisture monitoring points for cotton mulched drip irrigation Journal of Irrigation and Drainage 29(3):29-31 [4] Wang Shufang, Jiao Xiyun, Wang Weihan, et al (2009) Spatial and temporal variability of soil moisture under mulched drip irrigation Journal of Irrigation and Drainage 28(5):34-37
Online since: July 2014
Authors: Teng Jiao Lin, Wen Liu, Quan Cheng Peng
Based on pro/e and ANSYS, the lower natural frequency of reduction gear are analysed bu zhou[7].
swing 9 304.65 Bearing seat stretches along Z axis 10 329.86 Housing stretches along Y axis Table 3 The 1-10 order inherent frequency and modal of the gear system Modal order Frequency/Hz Modal characteristics 1 49.65 Input shaft, ahead shaft, back shaft rotate 2 67.27 Gear shaft, output shaft rotate 3 76.78 Input shaft, output shaft rotate, box swings around Y axis 4 94.83 Box swings around X axis, input shaft rotate 5 101.07 Input shaft, output shaft and bearing seat move along Z axis 6 102.34 Box swings around Z axis, output shaft moves along Y axis 7 110.41 Output shaft swings around X axis, Input shaft, ahead shaft move along Y axis 8 115.40 Box, transmission shaft move along Z axis 9 119.46 Box swings around Z axis, gear shaft, ouput shaft rotate 10 140.48 Input shaft, ahead shaft rotate The experimental modal analysis Modal testing instruments include force hammer, YFF-6-025 force sensor, B&K 4382 acceleration sensor, DLF-8 four in one functional amplifier, INV306U-5260 data
While signal collecting, the vibration signal measured by acceleration sensor and the force signal measured by force sensor is amplified, and then delivered to the data acquisition instrument to be collecting recorded and analyzed.
Amplifier Data acquisition instrument force sensor Acceleration transducer computer Fig. 3 Experimental modal test frame While testing the modal of the marine gearbox, in order to ensure that there is enough excitation in each direction, the excitation point was arranged on the tilt face of the box cover.
Use the intelligent signal collecting recorder and analyzer to analyze the transfer function of the test data.
Online since: October 2011
Authors: Zhan Ping Song, Ze Lin Niu
Data Reduction and Statistical Analysis To determine the distribution of random test data or the probability distribution of observations, which would be made a reasonable hypothesis H0 based on its distribution, and then test the hypothesis.
In order to obtain a more accurate evaluation of the results, the instrument must be advanced, work must be serious and data processing must be reasonable in process of collecting data.
Online since: August 2014
Authors: Feng Pian, Li Nan Du, Zhan Xiu Sun
For one thing it guarantees adequate financial support to development zone, for anther it resistance risk from supporting high-tech industry and from reduction in revenue followed by tax-cut policy, etc, which could block the development of urban, and it can avoid adversely affect from the urban.
Tab.1 HLM indicators and statistics data Indicators Quantity Mean Standard deviation Min Max First level LNGDP 144 4.33 1.57 1.04 8.38 T(TIME) 144 -2.50 1.71 -5.00 0.00 Second level I(Investment) 24 3.87 0.72 2.77 5.34 Y(Year) 24 23.00 4.18 16.00 26.00 D(Distance) 24 23.00 8.24 6.00 40.00 Based on the above analysis, we will construct individual development model of the development zone, and model data was in Tab.1.
It made the initial data through a logarithmic conversion, in order to eliminate heteroscedasticity.
Full model First level: (3) Second level: (4) (5) Where, T: time, 18 years data (1993-2010) was divided into six nodes’ time, and encoded -5,-4,-3,-2,-1,0; Y: development zone’s established life; I: urban investment through a logarithmic conversion.
Online since: August 2014
Authors: Jin Tao Zhang, Kai Bei Peng
The Mode set to logic 0 in order to control 2 to 1 multiplexer selects D0 data which is Signal.IN and directly propagate to SignalOUT.
Normal operation Simulation Circuit 3.2 Scan mode simulation Shift.DR and BIST.MODE are fixed to logic 1 so that the 4-to-1 multiplexer selects data D1 which is Scan.IN, and it propagate will to Scan.OUT at next raising edge of Clock.DR.
Mode is set to logic 1 in order to control 2 to 1 multiplexer selects data D1 which is the output of the second D flip-flop.
Test data is sent into the first cell Scan.IN pin and at next raising edge of Clock.DR will transfer to Scan.OUT then next cell.
This comparison shows the benefits of a boundary BIST approach to be a significant reduction in the time to test combinational logic residing between the boundaries of ICs in a circuit.
Online since: August 2014
Authors: Yermoldina Elmira, Moisa Raisa, Kayrbekov Zhaksyntay, Vasilina Gulzira
Results and Discussion According to XRF data of Semeytau zeolite field is presented by the main mordenity of Ca, Na, K2Al2Si10O24 • 7H2O with a rhombic lattice with parameters а=18,1065 Ǻ, в=20,4840 Ǻ.
At thermoactivation temperature increase from 400 to 5000C there is an insignificant reduction of quantity of a zeolite phase that is caused by compression of a crystal lattice.
For definition of availability degree of a surface is necessary to have data on a form and the sizes of a time in the catalyst.
Experimental data are given in table 2.
Group hydrocarbonic structure of liquid products of n-octane transformation on catalysts on the basis of Semeytau zeolite field (T – 5000C, feed space velocity –1 hour-1) № hydrocarbon group composition [% wt]. n-paraffins isoparaffins arena naphthenes olefins 1 Model №2 1 cycle 37,91 0,62 60,48 0,56 0,43 2 cycle 1,6 1,8 96,3 0,2 0,1 2 Model №3 1 cycle 32,1 1,7 64,2 0,2 1,8 2 cycle 1,4 1,3 97,1 0,1 0,1 From the data provided in table 2 it is visible that the main process of transformation of n-octane on the studied catalysts is aromatization – as a part of liquid catalysat 60,5-64,2 masses is revealed. % arena (5000C), including benzene, toluene, ethyl benzene and about - m-and p-xylols, thus quantity about - a xylol approximately equally to the sum of exits of all of the others arenas.
Online since: January 2004
Authors: Brian J. Sealy, Russell Gwilliam, Paul G. Coleman, X.D. Pi
c c Experimental results 2 Title of Publication (to be inserted by the publisher) Raw PAS data for the samples annealed in nitrogen are shown in Fig. 1(a), and the values of S at the positron energy corresponding to maximum sensitivity to the nc-Si/SiO2 interface (~ 4keV) are plotted in Fig. 1(b).
Implantation-induced volume compaction of SiO2 leads to the suppression of the formation of INCIDENT POSITRON ENERGY (keV) 0 2 4 6 8 10 S PARAMETER 0.455 0.460 0.465 0.470 0.475 0.480 0.485 0.490 0.495 0.500 (a) SiO2/Si SiO2 ann as implanted as prepared 400ºC 700ºC 900ºC 800ºC 550ºC ANNEALING TEMPERATURE IN NITROGEN (ºC) 0 200 400 600 800 1000 MEAN S PARAMETER 0.469 0.470 0.471 0.472 0.473 0.474 0.475 0.476 0.477 AS PREPARED Fig.1 (a) Raw PAS data for nc-Si in SiO2,annealed in N2 at five temperatures, together with as-implanted, asformed and SiO2/Si data.
The reduction of the interface volumes is compensated by the increase in the intrinsic open-volume of the SiO2 matrix.
Boden, Diffusion and Defect Data 53-54 (1987) 173
Online since: September 2013
Authors: Tao Liu, Yu Long Pei, Rong Hui Zhang, San Qiang Yang
Due to the reduction of the drive, light weight, low cost, low power consumption numerous advantages for other systems, it was caused widespread concern of many scholars, including physics, mechanics, applied mathematics, robotics and automation.
Fuzzy Detection Algorithm Make use of the parameter identify (the data flow) the examination mode with read to break down.
The spot when code produce data examination when the mode carried on break down examine a patient, have to right distinction the acquisition gets of the property of the examination parameter.
In this breakdown, the most valid diagnosis of method is to combine the work principle to enter, data in line is analytical.
Tradition of the method is the basis experience, data to statistics first, is a mechanism secondly cent expert assess, the end still needs to consider as follows factor: (1) Breakdown compared to expel easily, it belongs to one degree value to take big and some; (2) Break down frequency high of, it belongs to a degree to take a value big and some; (3) Usually use and come in contact with easily of take big and some; (4) More simple but again easily the breakdown neglect by person belongs to the degree take big.
Online since: November 2006
Authors: Myung Hyun Kim, Jae Myung Lee, Wha Soo Kim, Sung Won Kang
This is due to the removal of surface defects and/or reduction of the weld toe angle that results in a decrease of stress concentration at weld toes [1].
S-N data for each model obtained from the fatigue test are compared between As-weld and Burr-ground specimens based on nominal stress range.
Fig. 3 summarizes the S-N data obtained from the fatigue test for each model.
� Fig. 3 S-N data of test specimens for the evaluation of fatigue strength improvement The fatigue test data shown in Fig. 3 are fitted based on Eq. 1.
Online since: June 2014
Authors: Xiao Lin Hao, Ji Dong Wu, Ning Li
Impact of climate change on regional economy HAO Xiaolin1, 2, a,WU Jingdong1, 3, b* and Li Ning1, 2, c 1Academy of Disaster Reduction and Emergency Management,MCA & MOE, Beijing 2State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 3Key Laboratory of Environmental Change and Natural Disaster, Ministry of Education of China, Beijing Normal University, Beijing a xiaolin@mail.bnu.edu.cn ,b wujidong@bnu.edu.cn ,cningli@bnu.edu.cn *Corresponding author Key words:climate change, regional economy, industry impact Abstract.This study has carried out the economic impact of output by industry in Beijing, making meteorological factors as a productivity input with capital, and labor.
Jeffrey found those analysis tools economists had used could be also applied to the meteorological economic value and there were three ways to assess such as stated preference, economic models and data analysis [1].Larsen took traditional capital, labor and energy consumption, as well as the temperature and precipitation observations to estimate the sensitivity of U.S. economy for changes in the weather.
Data and Method Data.
The study takes Beijing as research area and uses two kinds of dada: economic indicator and meteorological element, including 1978-2012 labor population, investment in fixed assets and general domestic production by industry from the statistical yearbook of China; 1978-2012 annual precipitation observations and annual average temperature measurements from China meteorological data sharing service system.
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