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Online since: December 2014
Authors: Xiu Min Yu, Wei Bo Shi
Follow an overview of spark ignition engine using hydrogen and gasoline mixtures, general trade-off when operating engine on hydrogen and gasoline mixtures are analyzed and highlights regarding accomplishments in efficiency improvement and emissions reduction are presented.
For the richer mixture, 10% hydrogen blending leads to an substantial reduction of the total PM number concentration and a reduction of the total PM mass concentration [4].
Data analysis showed that lambda was an inadequate dilution parameter.
For the richer mixture, 10% hydrogen blending leads to an substantial reduction of the total PM number concentration and a reduction of the total PM mass concentration [4].
Data analysis showed that lambda was an inadequate dilution parameter.
Online since: January 2005
Authors: Kazuhiko Ohmori, Masaaki Doi, Pan Huayong, Hidefumi Asano, Tomonori Umeda, Takuya Sakaguchi, Nobuo Tanaka, Masaaki Matsui
Fe-Pt
nanoparticles were synthesized by the chemical reduction of H2PtCl6 and the decomposition of
Fe(CO)5 in the presence of PVP polymers.
On the other hand, Zeng et al.[5] reported that the FePt nanoparticle assemblies indicated exchange coupling resultant from the reduction of interparticle distances at annealing temperatures more than 600℃ and there is no evidence of carbon residue presented at grain * Present address: Department of Electronic Engineering, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan boundaries of the coalesced particles by annealing.
Experimental Method The synthesis of FePt nanoparticles is based on the reduction of H2PtCl6 (from Pt 4+ to Pt 0 by ethylene glycol(HOCH2CH2OH) and the decomposition of Fe(CO)5.
Assuming that all the nanopartcles are completely L10 ordered, this critical diameter is estimated to be 1.1nm from the above mentioned consideration using the data, K=5× 10 7erg/c.c. and TB=100K(Fig.6).
On the other hand, Zeng et al.[5] reported that the FePt nanoparticle assemblies indicated exchange coupling resultant from the reduction of interparticle distances at annealing temperatures more than 600℃ and there is no evidence of carbon residue presented at grain * Present address: Department of Electronic Engineering, Graduate School of Engineering, Tohoku University, Sendai 980-8579, Japan boundaries of the coalesced particles by annealing.
Experimental Method The synthesis of FePt nanoparticles is based on the reduction of H2PtCl6 (from Pt 4+ to Pt 0 by ethylene glycol(HOCH2CH2OH) and the decomposition of Fe(CO)5.
Assuming that all the nanopartcles are completely L10 ordered, this critical diameter is estimated to be 1.1nm from the above mentioned consideration using the data, K=5× 10 7erg/c.c. and TB=100K(Fig.6).
Online since: December 2009
Authors: Tomasz Goryczka, Henryk Morawiec, Józef Lelątko, S. Piechota, Danuta Stróż, Krystian Prusik
The Ni-Mn-Ga alloys extruded at high temperature with a relatively large reduction
rate were the subject of the studies.
The round ingots of 20 mm diameter were homogenized at 1100oC for 2 hours and extruded into rods of 10 mm diameter with the reduction rate of 75 %.
Fig. 4: Morphology of martensite (a) and diffraction pattern of five-layered structure in alloy 3 (b) Fig. 2: Elongated grains in the extruded rod Fig. 3: Microstructure of the martensitic elongated grains in the rod Fig. 5: EBSD pole figures of the columnar grains of the alloy 3 specimen The pole figures of the extruded rod from the alloy 3 taken from the longitudinal cross section (Fig. 6) contain the scattered data of the grains oriented about the <001> direction.
Computer processing of the scattered data allows to contour the pole figures and thus reveals the preferred orientation.
Fig. 6: EBSD pole figures with scattered data of the axial texture in the extruded rod of alloy 3 specimen The used relation is as follows: )/1/(])/(1[ 2 0 acac (3) for the five-layered martensite 0=0.12.
The round ingots of 20 mm diameter were homogenized at 1100oC for 2 hours and extruded into rods of 10 mm diameter with the reduction rate of 75 %.
Fig. 4: Morphology of martensite (a) and diffraction pattern of five-layered structure in alloy 3 (b) Fig. 2: Elongated grains in the extruded rod Fig. 3: Microstructure of the martensitic elongated grains in the rod Fig. 5: EBSD pole figures of the columnar grains of the alloy 3 specimen The pole figures of the extruded rod from the alloy 3 taken from the longitudinal cross section (Fig. 6) contain the scattered data of the grains oriented about the <001> direction.
Computer processing of the scattered data allows to contour the pole figures and thus reveals the preferred orientation.
Fig. 6: EBSD pole figures with scattered data of the axial texture in the extruded rod of alloy 3 specimen The used relation is as follows: )/1/(])/(1[ 2 0 acac (3) for the five-layered martensite 0=0.12.
Online since: January 2010
Authors: Himanshu M. Lalvani, Martin A. Rist, Jeffery W. Brooks
Results indicate that the presence of δ leads to a slight increase in peak
stress and a proportionately greater post-peak reduction in flow stress, as compared to solutiontreated material.
Fig. 3 shows optimised global fits of Eq. 1 to the experimental data using both peak stress, σp (Fig. 3a) and nominal steady-state stress, σss (Fig 3b).
The data is somewhat scattered, but the analysis confirms a lower steady-state stress, and a slightly higher peak stress, for the material containing δ phase.
Solid lines represent optimised fits of Eq. 1 to the flow data for solution-treated material (circles).
Dashed lines represent similar fits to the data for the as-received material containing δ precipitates (crosses).
Fig. 3 shows optimised global fits of Eq. 1 to the experimental data using both peak stress, σp (Fig. 3a) and nominal steady-state stress, σss (Fig 3b).
The data is somewhat scattered, but the analysis confirms a lower steady-state stress, and a slightly higher peak stress, for the material containing δ phase.
Solid lines represent optimised fits of Eq. 1 to the flow data for solution-treated material (circles).
Dashed lines represent similar fits to the data for the as-received material containing δ precipitates (crosses).
Online since: September 2013
Authors: Ron W. Anthony
The published design values are based on various test data and procedures published by the American Society for Testing and Materials [2] that demonstrate the engineering performance of the material.
Assuming that the condition of the timber is known, any design or structural analysis requires that the engineer or architect rely on published data and standards when conducting an analysis.
Paramount to conducting a proper structural analysis is having an understanding of the material data upon which the engineer or architect relies.
An issue that often arises when discussing historic versus modern test methods and data is the testing of small clear specimens and full-size timbers.
Over time, grading rules were modified as more technical data became available on material properties, and the effects of knots, slope of grain, and other defects on material properties were better understood.
Assuming that the condition of the timber is known, any design or structural analysis requires that the engineer or architect rely on published data and standards when conducting an analysis.
Paramount to conducting a proper structural analysis is having an understanding of the material data upon which the engineer or architect relies.
An issue that often arises when discussing historic versus modern test methods and data is the testing of small clear specimens and full-size timbers.
Over time, grading rules were modified as more technical data became available on material properties, and the effects of knots, slope of grain, and other defects on material properties were better understood.
Online since: September 2013
Authors: Hai Juan Wang, Hong Bin Wang, Xin Chun Xie, Yong Li Jiang, Yu Lei Zheng
Reagents were used in the analysis of pure grade,samples were used during national standard reference material(GBW-08501)to analyze the quality control.Arsenic standard solution purchased from the National Research Center,and sample measurement results are within the allowable error range,3 replicates per treatment.
2.2.2 Pb, Cd concentrations determination
Digestion solution after filtration constant volume, by atomic absorption spectrometry, 3 replicates each treatment.
2.3 Data processing and mapping
SPSS17.0,Excel2003 and Origin7.5 were used in the study to analyze the experimental data.
3 Results and Analysis
3.1 Reduction effect
P. vittata L. leaves quality were shown in Table 1 before and after incineration, which were incinerated at different temperatures for 4h.
According to figure 1, 70 °C for dry fresh and yellow leaf in the normal data arsenic determination result after drying, it is commonly measured arsenic content (dry weight), which can be seen through incineration conversion pinna of arsenic has declined, which indicates whether it is the normal growth of fresh leaves, the natural growth or yellow leaves, after a muffle furnace incineration, with its arsenic volatilization temperature increasing trend, under the experimental conditions, fresh attractives at 800°C arsenic volatilizing loss is the largest, while the dry naturally the most volatile at 400 degrees.
Thus obtained that, when incineration were setting at 400°C, the samples has the maximum quality loss, minimum amount of arsenic volatilization, comply with the requirement of treatment and postproduction :"quality reduction, arsenic volatilization harmless" .Analysis of results, 400°C is the optimum temperature incineration.
From the energy point of view, incineration of natural yellow leaves were better than the other treatments in realizing the reduction, resource and reusing
Peraha-Videa international poential of chilopsis linear is for gold phytomining:Using XAS to determine gold reduction and nanoparticle formation within plant tissues[J].Journal of Phytoremediation,2007,9:133-147
According to figure 1, 70 °C for dry fresh and yellow leaf in the normal data arsenic determination result after drying, it is commonly measured arsenic content (dry weight), which can be seen through incineration conversion pinna of arsenic has declined, which indicates whether it is the normal growth of fresh leaves, the natural growth or yellow leaves, after a muffle furnace incineration, with its arsenic volatilization temperature increasing trend, under the experimental conditions, fresh attractives at 800°C arsenic volatilizing loss is the largest, while the dry naturally the most volatile at 400 degrees.
Thus obtained that, when incineration were setting at 400°C, the samples has the maximum quality loss, minimum amount of arsenic volatilization, comply with the requirement of treatment and postproduction :"quality reduction, arsenic volatilization harmless" .Analysis of results, 400°C is the optimum temperature incineration.
From the energy point of view, incineration of natural yellow leaves were better than the other treatments in realizing the reduction, resource and reusing
Peraha-Videa international poential of chilopsis linear is for gold phytomining:Using XAS to determine gold reduction and nanoparticle formation within plant tissues[J].Journal of Phytoremediation,2007,9:133-147
Online since: December 2012
Authors: Qing Fei Xiao, Fu Kun Yan
Introduction
Mineral grinding is a size reduction process in essence, its main purpose and mission are depart the most of useful dissociating minerals from gangue when crushing the run-of-mine Mineral.Almost all mineral processing plants use mills for the size reduction of particles prior to physical and chemical processing.Continuation of milling beyond that required for size reduction leads to mechanical activation, the energy causing a steady-state particle size due to breakage and realloying of particles.especially in the mining[1], almost each concentrator plant has a grinding process, Research data shows that in mineral processing, comminution accounts for a substantial portion of the energy consumed in the plant,almost 60%.
Table1 Parts of application of this new lining plate comparison project Application plant name Machine specifications Improve the processing capacity in average (%) Reduce the energy consumption in average (%) Datong cement plant Ф2.40m×13.00m 3.99 20.0 Beijing cement plant Ф2.20m×5.50m 5.80 15.1 Maanshan Institute of Mining Research developed a kind of angular screw lining board, compared with the previous corrugated manganese steel liner in a plant named Aoshan under two stage grinding specific conditions, experiment data shows that under the same condition of processing capacity and grinding particle size, new lining board could reduce power consumption of 22.26%, and 30.51% consumption of the ball.
Static and dynamic pressure bearing ball mill The current trend in industry is to run turbo machines at high speeds in order to make them compact and reduce mass.It is found that the performance of ordinary circular or multi-lobe bearings is not very satisfactory .To improve the stability of these bearings,pressure dams are incorporated in these bearings.The analytical dynamic analysis[5-7]has shown that the cylindrical pressure-dam bearings are found to be very stable.Also an experimental stability analysis of such types of bearings [8]showed that the analytical stability analysis provides the general trends in the experimental data.
Gansu Longnanxi and Fuli processing plant adopted the first QSZ-1530 center drive mill [11], effectively increased the processing capacity by 0.33 t/h, overflow fineness increased 11 percentage points; and the center drive mill installed capacity reduced 20 kW compared with the specifications of the ball mill,measured the power reduction of 25kW, In a word,a reduction of 28.4%, thus we can expected annual energy-saving would arrived at 183600 kW •h compared with Qingyangxia concentrator plant,which adopted the lattice type ball mill.
Table1 Parts of application of this new lining plate comparison project Application plant name Machine specifications Improve the processing capacity in average (%) Reduce the energy consumption in average (%) Datong cement plant Ф2.40m×13.00m 3.99 20.0 Beijing cement plant Ф2.20m×5.50m 5.80 15.1 Maanshan Institute of Mining Research developed a kind of angular screw lining board, compared with the previous corrugated manganese steel liner in a plant named Aoshan under two stage grinding specific conditions, experiment data shows that under the same condition of processing capacity and grinding particle size, new lining board could reduce power consumption of 22.26%, and 30.51% consumption of the ball.
Static and dynamic pressure bearing ball mill The current trend in industry is to run turbo machines at high speeds in order to make them compact and reduce mass.It is found that the performance of ordinary circular or multi-lobe bearings is not very satisfactory .To improve the stability of these bearings,pressure dams are incorporated in these bearings.The analytical dynamic analysis[5-7]has shown that the cylindrical pressure-dam bearings are found to be very stable.Also an experimental stability analysis of such types of bearings [8]showed that the analytical stability analysis provides the general trends in the experimental data.
Gansu Longnanxi and Fuli processing plant adopted the first QSZ-1530 center drive mill [11], effectively increased the processing capacity by 0.33 t/h, overflow fineness increased 11 percentage points; and the center drive mill installed capacity reduced 20 kW compared with the specifications of the ball mill,measured the power reduction of 25kW, In a word,a reduction of 28.4%, thus we can expected annual energy-saving would arrived at 183600 kW •h compared with Qingyangxia concentrator plant,which adopted the lattice type ball mill.
Online since: October 2018
Authors: Ahmed Abd El-Moneim, Amr Hessein
The photovoltaic measurements were performed using a solar simulator (San-Ei Electric XES-40S1) at AM 1.5 at 1 sun illumination intensity (100 mW/cm2), and the current density–voltage (J-V) data were recorded using a source meter unit (Keithley SMU 2400).
Hence, the value of the cathodic current density (Jred) is directly related to the electrochemical activity of the tested CE for Sx2- ions reduction.
The EIS data were fitted to the equivalent circuit shown in Fig. 4(d) using Zsimpwin software and the fitted impedance parameters are summarized in Table 1.
Also, the reduction in Rs values of RGO:CuS CEs indicate the better binding between the CE active material and the FTO substrate.
(a) The J-V curves of CdS QDSSCs based on the different CEs, (b) the reproducibility test data.
Hence, the value of the cathodic current density (Jred) is directly related to the electrochemical activity of the tested CE for Sx2- ions reduction.
The EIS data were fitted to the equivalent circuit shown in Fig. 4(d) using Zsimpwin software and the fitted impedance parameters are summarized in Table 1.
Also, the reduction in Rs values of RGO:CuS CEs indicate the better binding between the CE active material and the FTO substrate.
(a) The J-V curves of CdS QDSSCs based on the different CEs, (b) the reproducibility test data.
Online since: June 2022
Authors: Radu Cojocaru, Alexandru Adrian Geana, Lia-Nicoleta Botila, Ion Aurel Perianu
The definite and unanimously appreciated advantages of this process are well known as they generate important benefits [1-4]:
- increasing the operational durability of loaded parts, by up to max. 300%, by protecting the wear surfaces with adequate materials in correlating the characteristics of the operating stresses;
- reduction of the consumption of special steels by up to 90% by replacing them differentially in the composition of weight bearing structures with carbon steels or low-alloy steels, over which, in the area subjected to wear, welding-compatible materials are deposited meeting the base level of specific strength requirements;
- reduction of energy consumption by up to 65% by eliminating operations specific to the classical processing process;
- increasing operational safety and reducing the risk of damage to loaded parts, as a result of improving the quality level;
- reduction of operating costs.
Fig. 4 Tram wheel bandage (I-IV reconditioned areas by mechanized MIG / MAG welding) At the time of implementation, the specialized MIG / MAG welding reconditioning installations, made and put into operation at the autonomous public transport utilities in Timisoara, Arad and Iasi, ensured the following economic effects: · the expenses with reconditioning / used part represent max.30% of the purchase price of a new part; · significant increase in operational safety for mechanized reconditioning compared to manual; · reduction by approx. 50% of the labor required for reconditioning, by: o reduction of auxiliary times affected by machining operations after welding, as a result of uniform deposits; o reduction of the auxiliary times necessary to disassemble the bandages on the wheels, respectively axles; · reduction of consumption of electricity and welding materials by approx. 20%; · decrease (by approximately 70%) of the import of new components necessary for the means of transport
The mobile automated inspection system must determine as accurately as possible the degree of wear of the tram wheel tires; the data obtained from the inspection process are saved and used to program the operating cycle of the automated system for loading by welding; an inspection sheet is generated, based on the data obtained from the inspection process as well as the related recommendation (whether or not it is necessary to recondition the respective part).
Mobile automated inspection system presents the following innovative solutions: - Mobility is the main innovative element of the system and its major advantage, allowing easy use directly at the beneficiary's premises and identification of parts that need reconditioning without the need to disassemble them for inspection, thus reducing the time required and eliminating costs related to labor procedures for disassembly / assembly of part as well as replacement of related consumables; - Wear analysis algorithms are also an innovative element, which is based on the analysis of data obtained from precision measurements of laser sensors used to determine the size of the bandage, its thickness and the characteristics of damaged areas (dimensions, depths etc.) thus allowing much faster and more accurate identification of parts that require reconditioning.
Conclusions - The main reasons for the regular maintenance of means of transport are: increased operational safety, safety and comfort of passengers, reduction of noise, increase the life of wear components, reduction of malfunctions; - Rehabilitation by welding of used components allows to reduce the operating costs of public transport; - The use of automated welding loading systems ensures a uniform deposition of the layers, which has the effect of reducing by ≈10% the labor for post-welding operations (machining to restore the profile of the reconditioned parts to the prescribed dimensions)
Fig. 4 Tram wheel bandage (I-IV reconditioned areas by mechanized MIG / MAG welding) At the time of implementation, the specialized MIG / MAG welding reconditioning installations, made and put into operation at the autonomous public transport utilities in Timisoara, Arad and Iasi, ensured the following economic effects: · the expenses with reconditioning / used part represent max.30% of the purchase price of a new part; · significant increase in operational safety for mechanized reconditioning compared to manual; · reduction by approx. 50% of the labor required for reconditioning, by: o reduction of auxiliary times affected by machining operations after welding, as a result of uniform deposits; o reduction of the auxiliary times necessary to disassemble the bandages on the wheels, respectively axles; · reduction of consumption of electricity and welding materials by approx. 20%; · decrease (by approximately 70%) of the import of new components necessary for the means of transport
The mobile automated inspection system must determine as accurately as possible the degree of wear of the tram wheel tires; the data obtained from the inspection process are saved and used to program the operating cycle of the automated system for loading by welding; an inspection sheet is generated, based on the data obtained from the inspection process as well as the related recommendation (whether or not it is necessary to recondition the respective part).
Mobile automated inspection system presents the following innovative solutions: - Mobility is the main innovative element of the system and its major advantage, allowing easy use directly at the beneficiary's premises and identification of parts that need reconditioning without the need to disassemble them for inspection, thus reducing the time required and eliminating costs related to labor procedures for disassembly / assembly of part as well as replacement of related consumables; - Wear analysis algorithms are also an innovative element, which is based on the analysis of data obtained from precision measurements of laser sensors used to determine the size of the bandage, its thickness and the characteristics of damaged areas (dimensions, depths etc.) thus allowing much faster and more accurate identification of parts that require reconditioning.
Conclusions - The main reasons for the regular maintenance of means of transport are: increased operational safety, safety and comfort of passengers, reduction of noise, increase the life of wear components, reduction of malfunctions; - Rehabilitation by welding of used components allows to reduce the operating costs of public transport; - The use of automated welding loading systems ensures a uniform deposition of the layers, which has the effect of reducing by ≈10% the labor for post-welding operations (machining to restore the profile of the reconditioned parts to the prescribed dimensions)