Search Options

Sort by:

Sort search results by

Publication Type:

Publication Type filter

Open access:

Publication Date:

Periodicals:

Periodicals filter

Search results

Online since: September 2014
Authors: Bin Ouyang, Zhen Hua Feng, Xue Ying Yang, Yang Liu, Yi Zhang
Currently, domestic and foreign scholars have done a lot of researches on green and low-carbon evaluation system, and evaluation methods mainly include input-output, analytic hierarchy process (AHP), fuzzy comprehensive evaluation, data envelopment analysis(DEA), and principal component analysis (PCA) etc.[5, 6].
(2) Evaluation basis and standards: primary data of evaluation indicators mainly comes from China Transport Statistical Yearbook and Collection of Provincial Transport Statistical Data; statistical data of transportation and highway of provinces or cities; major enterprise monitoring and typical survey data etc.
Empirical analysis of green and low-carbon development level of Hunan Linxiang-Yueyang Expressway 3.1 Data With a total length of 72.04km, Hunan Linxiang-Yueyang Expressway (short for Da-Yue Expressway) was fully commenced in 2013, and it was planned that this expressway would be completed and opened in 2016.
The data mainly comes from statistical data of Hunan Transportation from Hunan Provincial Department of Transportation and Hunan Expressway Administration Bureau in the past years, as well as statistical monitoring of energy consumption and typical survey data, etc. 3.2 Evaluation results According to overall requirements of green low-carbon highway evaluation index system, under the condition of combining development feature and actual situation of Hunan Da-Yue Expressway, this paper proposes that the overall objective of green low-carbon development of Hunan Da-Yue Expressway is: by 2017, the first green and low-carbon highway in Hunan will be basically completed, the total energy conservation will be up to 41,900 tons of standard coal equivalent, 29,800 tons of standard oil equvilent (toe) will be replaced, and CO2 emission will be reduced by 119,900 t; the total energy consumption in construction period will decrease by 73.4%, and the total amount of carbon emission will decrease
Acknowledgements The authors gratefully acknowledge the financial support from NDRC China Low Carbon Development Strategic Research Project Grant No.201215, Ministry of Transport Energy-saving and Emission-reduction Project Grant No. 2013-JNJP-011-020.
Online since: August 2015
Authors: Tri Hardi Priyanto, Parikin Parikin, Nurdin Effendi
Hot rolling process of A2D2 is performed by a reduction of 0.1 mm per pass of a certain thickness to achieve a thickness is about 7 mm or 70% thickness reduction.
Diffraction pattern of austenitic stainless steel a) before and after machining process. b) before and after hot rolling process for 70% thickness reduction. .
FWHM vs (hkl) of samples a) before and after machining process. b) before and after hot rolling process for 70% thickness reduction.
The data of the first three bragg peaks were recorded by “step-scanning” method in 2q ranges from 33° to 64° using 0.1° step scan, the measurements time is about 35 sec/ step.
Ä Ä Å Ä Ä Ä Ä Æ Æ Æ Æ Æ Æ Æ Æ Æ Æ Æ Æ Æ Å Å Æ Figure 3 .a) Experimental and b) Calculated pole figures of (111), (200), and (220) after rolling process of 70% thickness reduction.
Online since: August 2014
Authors: Yan Qiong Song, Le Ming Xiao
Research on intelligent FCL to realize seamless power supply between the port and ship for energy conservation and emissions reduction XIAO Leming1,a,SONG Yanqiong2,b 1,2(Guangzhou Maritime Institute, Guangzhou,China,510725) axlm201@sina.com, bsongyqh@126.com Keywords: FCL; on-shore controlling circulation current; seamless connection; on-shore power connected Abstract.
Power system management can be proceeded via the alarm monitoring, data monitoring and the analysis; and also can change 10.0 kV / 50 Hz, 6.0 kV / 50 Hz power system in harbor grid by frequency conversion to 6.6 kV / 60 Hz A.C. electrical system, meanwhile, control the power supply of better quality; more scientific measurement of electricity can be carried out according to the market price, equipment and management cost; at the same time running simulation and processing information, through flexible building and configuration, it can carried out that integrity of on-shore power equipment management, monitoring, control, protection, billing and simulation and information processing, which are independent of each other on the function, so as to satisfy the requirement of high voltage level on-shore power access.The ship energy conservation and emissions reduction in port on-shore power connected, green environmental protection, energy conservation and emissions reduction are discussed in
documents[1]--[4].According to the typical value of marine diesel generating sets i.e. 7.68 kg/(kW·h), calculation is as follows, including: N2, O2, CO2, H2O mixed waste gas content (99.7%), 7.657 kg/(kW·h); NOX, SOX, HC, CO and harmful substances (0.3%), 23 g/(kW·h); Ship diesel generator of CO2 emissions data, specific fuel consumption of 185 g/(kW·h), the CO2 emissions of 610g/(kW·h)[5].
Intelligence platform control voltage of transformer, cooperate with ship's generator control panel, achieve load transfer, intelligence platform for data display and all kinds of fault alarm at the same time, intelligence platform with terminal Intelligent power supply system are an important part of Intelligent port.
When shore power through to Marine electric GTO get through, shore power transformer and Marine generator, before the synchronization with circulation current, circulation current reaches a certain value, the gate control gain control signal, GTO disconnect, L reactor access current limiting and automatic synchronization, Marine generator pull in synchronization, Marine generator run out, shore power transformer power supply, circulation current is normal, the gate at the same time to get computer time signal and the circulation current detection data signals, GTO get through, L reactor short circuit, shore power transformer power supply directly.
Online since: March 2017
Authors: Mohamed Wahab Mohamed Hisham, Alinda Samsuri, Fairous Salleh, Tengku Shafazila Tengku Saharuddin, Azizul Hakim, Wan Nor Roslam Wan Isahak, Norliza Dzakaria, Mohd Ambar Yarmo
For identification purposes of crystalline phase composition, diffraction pattern obtained were matched with standard diffraction data (JCPDS) files.
Results and Discussion According to the thermodynamic data, complete carburization of metallic Fe with carbon monoxide may occur in two possible equations that have been shown in the Table 1.
The TPR profile for Fe in non-isothermal reduction under 20 % CO in nitrogen is shown in Figure 1.
It was found that the carburization rate was affected by change of surface conditions and surface area by reduction, degradation, and cracks at high temperature [16].
The comparison of different temperature with the XRD data revealed that the carbon peak is obviously appear as temperature is 500 °C because of Boudouard reaction.
Online since: December 2012
Authors: De Liu
In this system,the literacy controller of SD card by SPI interface is designed based on FPGA.The overall design is realized in Nios II soft processor with C/C++ language,and the technology of First In First Out is used to solve timing problems,and then ultimately the overall design features are realized.This design takes advantages of the features of FPGA,which has reduction in development time,an efficient data processing,and other characteristics.The successful application in data storage collected by the audio chips shows that the design is feasible and valid.
In this system the SPI bus interface is used for data communication and FIFO technology is used to realize data clock synchronization, finally the SD card initialization and functions such as reading and writing operations are completed .
SPI interface controller Four lines is used by SPI interface:the serial clock line(SCK),the host input/slave output line(MISO),the host output/slave input line(MOSI) and the enable signal line(CS).FPGA is the host of the system.When the enable signal (CS) is low,data is sended in falling edge of the serial clock signal (SCK) and is read in rising edge.SPI is a ring bus structure as shown in Fig.2.When the CS signal is valid,the parallel data from the host is stored in the shift register and is converted into the serial data.Then the serial data is stored in SD card.At the same time the serial data in SD card is read and is converted into parallel data by the shift register when the CS signal is valid,then the parallel data is returned to the host.
Literacy controller The literacy controller has two components,the command controller and the data controller.Fig.3 is the block diagram of literacy controller.After the initialization,a written instruction or a read instruction is sended from the command controller to the SD card in the CS effective signal ( low level ) and waiting for the SD command response.When the SD command response is 0x00h,the status skips to the data controller.A data starting token (0xFE) was sended by the writing data controller after received the right writing command from the SD card and SD card is written into the corresponding data.Here the default data length is 512 byte,at the same time there are two bytes of CRC check bit.After finished these 512 bytes data,SD card come into the busy status and data write operation is completed.Read-write operation are inverse process, here no longer give necessary details.
The difference between the gathering rate of data and the reading and writing rate of SD card data maybe lead to discontinuous data or missing data.Increasing the reading and writing data cache can effectively solve this problem.When data is written or read,in order to avoid overflow or read in the empty state,it must be ensure that the FIFO can not be written in full state and can not be read in the empty state.The capacity of the buffer can be selected according to the rate of the data collected.The 16-bit width FIFO is used in this design.
Online since: July 2014
Authors: Ji Wei Li
The data extracted by piezoelectric acceleration sensor is more intuitive, more convenient.
But this method can not realize long distance real time monitoring, there are some shortcomings such as the piezoelectric sensor is still the traditional connection mode, when the number of measuring point is more, the test operation time will be in short [10]; and like that only one sensor can be arranged in a cross section, which can only measure the parameters of a specific section of real-time monitoring, but the long distance real-time changes of the parameters along the line is in need; moreover the data processing must be carried on after the end of the test, which can not monitor in real time.
The development of science and technology provides the possibility for solving the above defects, the distributed optical fiber sensing technology with its unique advantage is particularly worthy of esteem[11]: it can realize remote measurement and monitoring; it can carry on the long distance test, it has high performance ratio; the optical fiber can all become sensitive element, which can acquire the distribution information of measured the sensing area in real time; it can process data in real time, and it can achieve truly real-time monitoring, timely finding and solving the potential problems and harm.
The experimental method obtains data through tests, analyzes vibration propagation and environmental impact through the data.
During the choice of building materials, it is necessary to choose some greater rigidity material, such as while selecting the materials of the ground, the hard materials can be chosen, such as cement floor and terrazzo floor, which have good vibration reduction effect.
Online since: October 2011
Authors: Ying Li Shao
The traditional exhaust silencers, which are normally constructed by combination of expansion chamber, and perforated pipe or perforated board, are with high exhaust resistance, but poor noise reduction especially for the low-frequency band noise.
But most of the traditional exhaust mufflers are composed of expansion chamber, and perforated pipe or perforated board [2], whose exhaust resistance is rather great and whose function of noise reduction is very poor, especially for the low frequency, which is the major part of exhaust noise [3].
In accordance with the theory of sound radiation, the author can regard the two opposite holes as the two plunger sound source, and due to the reverse oscillation, the radiation capability of the combined sound resource is reduced, so the author can reach the aim of noise reduction.
Fig. 1 Principle of the muffler using reversed-phase cancelling Analysis to the experimental results The theoretical formula for transmission loss of the new type muffler TL= The author designs 3 series of data and name them as Muffler TypeΙ, Muffler TypeⅡ and Muffler TypeⅢ, and their sizes are as the following: Muffler TypeΙ: r=165mm, l=80mm; Muffler TypeⅡ: r=165mm, l=60mm; Muffler TypeⅢ: r=56mm, l=80mm -5 0 5 10 15 20 31.5 63 125 250 500 1000 2000 4000 Times the frequency range/Hz Insertion loss/dB orig new1 new2 new3 Fig.2 The contrast curve of the insertion loss (1400r/min) -5 0 5 10 15 20 31.5 63 125 250 500 1000 2000 4000 Times the frequency range/Hz Insertion loss/dB orig new1 new2 new3 Fig.3 The contrast curve of the insertion loss (1600r/min) -5 0 5 10 15 20 31.5 63 125 250 500 1000 2000 4000 Times the frequency range/Hz Insertion loss/dB orig new1 new2 new3 Fig.4 The contrast curve of the
Online since: August 2011
Authors: Chao Guo, Yin Sheng Dong, Xin Xin Li
Liquid chemical reduction method was used to fabricate silver/hydroxyapatite nanoparticles (nano-Ag/HA) by depositing nano-Ag on the surface of hydroxyapatite nanoparticles (nano-HA).
Díaz [14] fabricated nano-Ag/HA by a colloidal chemical route and subsequent reduction process in H2/Ar atmosphere at 350˚{TTP}730 C.
Nano-Ag/HA was fabricated by liquid chemical reduction method and the typical process was as follows.
The diameter of ZOI is larger than the reported data by Díaz [14] and Nirmala [15], suggesting that the composite dressing has a strong antimicrobial activity, which can be contributed to the small sizes and good dispersity of nano-Ag on the surface of the alginate dressing.
Fig. 4 Antimicrobial property of Ag/HA/alginate dressing Conclusions In this paper, nano-Ag/HA was fabricated by a liquid chemical reduction method.
Online since: October 2014
Authors: Xian Hui Rong, Xu Liang Lv, Wei Dong Xu, Jiang Hua Hu, Qi Jia
Introduction With the rapid development of high-tech electronics industry, digital camera is widely used in the data collection of background and objective, especially in the field of pattern design and supervisory controlling, which can be served as the background color characteristic and objectives effect evaluation.
(a) Before reduction (b) After reduction Figure 1.
Reduction percentage of color difference Number 1 2 3 4 5 6 7 8 9 10 11 12 Max.
Because the background investigation to the earth need collect a lot of data, which need a lot of financial and human resources, as well as other limiting conditions, the qualified color checker color card is not produced here.
Therefore, the color reduction of digital cameras capture image is necessary.
Online since: October 2011
Authors: Joo Hwan Jang, Nam Yong Jee, Seung Yup Roh
Table 1 A Main Characteristic of BWM* Item High Low The Reduction Effect of Depth ○ The Economic Efficiency ○ The Accumulation of Construction Know-How ○ The Reduction Effect of Concrete Quantity ○ The Shortening Effect of Construction Duration ○ The Possibility of Remodel ○ The Possibility of Changeable Plan ○ The Occurrence Quantity of CO2 ○ The Occurrence Quantity of Construction Waste ○ *this result on comparing BWM & LDWM A Lightweight Dry Wall Method The lightweight dry wall method (LDWM) is the apartment on compositing the only column & slab without a beam and on comparing the general rahmen structures, it can reduce the height like the height of beam and on exhausted the BWM, it has the merit to be secured the changeable of space section.
A Main Characteristic of LDWM* Item High Low The Reduction Effect of Depth ○ The Possibility of Changeable Plan ○ The Reduction Effect of Quantity of Field Wall ○ The Reduction Effect of Quantity of Concrete ○ The Quantity of CO2 Occurrence ○ The Economic Efficiency ○ The Extension of Building Life Cycle ○ The Occurrence Quantity of Construction Waste ○ *this result on comparing BWM & LDWM A Comparison of Each Method throughout the Field Data For comparing the LDWM & the BWM, it compared to select the field in South Korea to construct the LDWM and BWM together.
This was elevated the construction efficiency of frame construction on the easiness of workability because of reduction of complicated structure wall and the management of field was easy then the reduction of construction duration and productivity was up.
The Comparison of Economic efficiency of BWM and LDWM Description 74㎡ Type 84㎡ Type BWM LDWM Differ* Ratio BWM LDWM Differ. * Ratio Construction Finishing 12,901 55.2% 13,882 60.3% ▽981 107.60% 14,221 52.7% 16,044 60.5 ▽1,823 112.82% Frame 9,808 42.0% 8,564 37.2% △1,244 87,32% 12,007 44.5% 9,753 36.7% △2,254 81.23% G.S 651 2.8% 592 2.6% △59 90,93% 779 2.9% 724 2.7% △55 92.94% Sum 23,360 78.5% 23,038 77.6% △322 98.62% 27,007 78.9% 26,521 77.4% △486 98.20% Mechanic 3,667 12.3% 3,759 12.7 ▽92 102.51% 3,923 11.5% 4,032 11.7% ▽109 102.78% Electronic 2,730 9.2% 2,893 9.7% ▽163 105.97% 3,278 9.6% 3,714 10.8% ▽436 113.30% Total Sum 29,756 100% 29,690 100% ▽67 99.78% 34,208 100% 34,267 100% ▽59 100.17% *this data is to analyze selected field in the Kumho industrial E&C, South Korea.
Showing 4381 to 4390 of 40694 items