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Online since: October 2011
Authors: Yan Mei Meng, Quan Zhou, Ying Ning Hu, Hai Feng Pang, Dao Yang Li, Xuan Yu, Bing Hua Ou
This paper makes the ForceControl configuration software as a development platform of monitoring system, and uses data collector to intensively collect the data which is measured by field measuring instruments, and transmits the data to the host computer via Ethernet, so that accomplishes the remote on-line automatic monitoring of ground source heat pump unit's operating status and provides a powerful data reference for assessing the energy saving effect of GSHP[1].
Monitoring data and calculated data through the automatic acquisition should be able to truly reflect the dynamic changes of GSHP system, ensure the data's real-time performance, correctness and rationality[4].
Based on the ground source heat pump system's principle, the monitoring system dynamically simulates the actual on-site ground source heat pump unit's structure, intuitively and dynamically displays the important parameters of the changes of each parts of ground source heat pump system and the opening situation of the valve, and views current data dynamic changes, real-time data, historical data and historical data changes.
The Data Collector Works as OPC Server.
Since the information and data of collection points of data collector in this system are managed by the host computer's management software, and the data collector can not directly dock and communicate with ForceControl configuration software, but the data collector itself supports OPC access, so the system uses the host computer's management software to real-time upload the information and data of collection point of data collector to OPC server in the host computer, and to change into managing the information and data of collection point by OPC server.
Monitoring data and calculated data through the automatic acquisition should be able to truly reflect the dynamic changes of GSHP system, ensure the data's real-time performance, correctness and rationality[4].
Based on the ground source heat pump system's principle, the monitoring system dynamically simulates the actual on-site ground source heat pump unit's structure, intuitively and dynamically displays the important parameters of the changes of each parts of ground source heat pump system and the opening situation of the valve, and views current data dynamic changes, real-time data, historical data and historical data changes.
The Data Collector Works as OPC Server.
Since the information and data of collection points of data collector in this system are managed by the host computer's management software, and the data collector can not directly dock and communicate with ForceControl configuration software, but the data collector itself supports OPC access, so the system uses the host computer's management software to real-time upload the information and data of collection point of data collector to OPC server in the host computer, and to change into managing the information and data of collection point by OPC server.
Research on Surveillance Risk Index System of Unified and Interconnected Electricity Market in China
Online since: December 2014
Authors: Chun Cheng Gao, Shu Hong Shi
supervision risks are mainly reflected in the following aspects:
(1) Under the background of the unified and interconnection electricity market, the state of electricity market will change significantly, and the state features such as market supply and demand, monopoly and activation imply potential transaction risks;
(2) During the process of transaction execution, potential transaction risks will be caused by all kinds of illegal trading behavior of different market subjects;
(3) Unified organization of network interconnection and electricity trading should be able to realize the trans-regional and transprovincial trading cooperation, trans-regional and transprovincial utilization cooperation of clean energy, so the market cooperative situation also reflects the transaction risk;
(4) Through the organization of interconnected electricity market transaction, the whole network energy coordination can be achieved, asset utilization efficiency can be enhanced, energy-saving and emission-reduction
(2) Amount of coal saving The amount of coal saving reflects the situation of energy-saving and emission-reduction, which refers the amount of standard coal saved by using clean energy and trading generation rights.
(3) Amount of pollutant emission reduction Amount of pollutant emission reduction reflects the situation of energy-saving and emission-reduction, which means the emission amount of soot decreased by using clean energy and trading generation rights.
(3) The index system meets the present situation of unified and interconnected electricity market in China, and relevant data support form State Grid Power Exchange Center can be obtained.
(2) Amount of coal saving The amount of coal saving reflects the situation of energy-saving and emission-reduction, which refers the amount of standard coal saved by using clean energy and trading generation rights.
(3) Amount of pollutant emission reduction Amount of pollutant emission reduction reflects the situation of energy-saving and emission-reduction, which means the emission amount of soot decreased by using clean energy and trading generation rights.
(3) The index system meets the present situation of unified and interconnected electricity market in China, and relevant data support form State Grid Power Exchange Center can be obtained.
Online since: April 2016
Authors: Zbigniew Pater, Tomasz Bulzak, Janusz Tomczak
During rolling by means of the parallel method the forging can be formed by diameters reduction and upsetting at the same time.
At the same time, due to reduction of billet diameter, steps are formed at both sides of the conical step.
In the next part of the process, the further reduction of billet diameter takes place.
Therefore, it leads to reduction of unnecessary strains localized mainly in the layers near the surface.
According to the literature data aluminum alloy Ti6Al4V should be formed within the scope of temperatures: the process beginning 960-900°C or 980-925°C, yet, the final temperature should not be lower than 800°C [1,2].
At the same time, due to reduction of billet diameter, steps are formed at both sides of the conical step.
In the next part of the process, the further reduction of billet diameter takes place.
Therefore, it leads to reduction of unnecessary strains localized mainly in the layers near the surface.
According to the literature data aluminum alloy Ti6Al4V should be formed within the scope of temperatures: the process beginning 960-900°C or 980-925°C, yet, the final temperature should not be lower than 800°C [1,2].
Online since: May 2005
Authors: Karl Roll, D. Lorenz
The BIW accounts for 25 to 30 % of the vehicle weight [1, 2] and offers
therefore effective possibilities for a reduction of the vehicle weight.
The choice of a proper material is an often used approach to weight reduction.
Especially in hot forming a local thickness reduction during forming does not induce a local increase of the final components strength, as it is the case in cold forming.
So reductions in sheet thickness are as well local reductions of the components load carrying capacity.
Yet no reliable data for the friction coefficient in hot forming is available, only the experience that it is much higher than in conventional forming processes.
The choice of a proper material is an often used approach to weight reduction.
Especially in hot forming a local thickness reduction during forming does not induce a local increase of the final components strength, as it is the case in cold forming.
So reductions in sheet thickness are as well local reductions of the components load carrying capacity.
Yet no reliable data for the friction coefficient in hot forming is available, only the experience that it is much higher than in conventional forming processes.
Online since: September 2017
Authors: S. Iyengar, Alexey V. Bogomolov, A. Zhakupov
Enhancement of strength properties is not difficult to obtain by decreasing tempering temperature, however it leads to reduction of plastic properties that will lead to overrange of mechanical properties as per API Spec 5CT accordingly.
Works of many researches prove that grain size reduction and increase of both strength and plastic properties accordingly are achieved at each heating cycle and subsequent quenching.
In this case austenite homogenization, reduction of segregational heterogeneity, partial dissolution of non-metallic inclusions and change of their shape to a rounder one occur.
Besides, as a result of heat treatment cycling austenite homogenization, partial coagulation of non-metallic inclusions, reduction of detrimental impurities at borders of grains and development of polygonized ferrite uniform structure with dispersed carbides occur.
Moreover, steel can be considered as suitable for operation in hydrogen sulfide medium when performing condition [21]: σт/σв≥0.8 (1) Data of yield strength and tensile strength available in table 8 confirm the possibility to use steel in aggressive medium processed under proposed conditions of heat treatment since σт/σв=0.9.
Works of many researches prove that grain size reduction and increase of both strength and plastic properties accordingly are achieved at each heating cycle and subsequent quenching.
In this case austenite homogenization, reduction of segregational heterogeneity, partial dissolution of non-metallic inclusions and change of their shape to a rounder one occur.
Besides, as a result of heat treatment cycling austenite homogenization, partial coagulation of non-metallic inclusions, reduction of detrimental impurities at borders of grains and development of polygonized ferrite uniform structure with dispersed carbides occur.
Moreover, steel can be considered as suitable for operation in hydrogen sulfide medium when performing condition [21]: σт/σв≥0.8 (1) Data of yield strength and tensile strength available in table 8 confirm the possibility to use steel in aggressive medium processed under proposed conditions of heat treatment since σт/σв=0.9.
Online since: June 2008
Authors: Cristina Galacho, Manuela M.L. Ribeiro Carrott, Peter J.M. Carrott, J.M. Valente Nabais
Prior to the determination of the adsorption isotherms, the samples were outgassed for 8h at 453K,
The total and external surface areas and the pore volumes, were estimated in the usual manner from
the corresponding αs plots constructed using standard data for adsorption of nitrogen on non-porous
partially hydroxylated silica.
Reduction of pore volume relative to pure silica grades as a function of Ti/Si molar ratio for TiPpn-x series. 0.0 0.2 0.4 0.6 0.8 1.0 p/po 0 5 10 15 20 25 nads / mmol g-1 TiPp16-0.1 TiPp14-0.1 TiP16-0.1-ps TiP14-0.1-ps (a) 2θ / º Intensity / a.u.TiPp14-0.1 TiPp16-0.1 TiP-14-0.1-ps TiP16-0.1-ps (b) Fig. 4.
The accentuated reduction in Vp also suggests the partial blocking of the porous system.
The increase of Ti content leads to a gradual reduction of quality of the pore structure and of the pore volume in TiPpn-x samples.
In spite of reduction in As (~15%) and Vp (~20%) the use of the direct synthesis at ambient temperature and pressure showed itself to be a better alternative for obtaining titanosilicates with highly regular MCM-41 structure.
Reduction of pore volume relative to pure silica grades as a function of Ti/Si molar ratio for TiPpn-x series. 0.0 0.2 0.4 0.6 0.8 1.0 p/po 0 5 10 15 20 25 nads / mmol g-1 TiPp16-0.1 TiPp14-0.1 TiP16-0.1-ps TiP14-0.1-ps (a) 2θ / º Intensity / a.u.TiPp14-0.1 TiPp16-0.1 TiP-14-0.1-ps TiP16-0.1-ps (b) Fig. 4.
The accentuated reduction in Vp also suggests the partial blocking of the porous system.
The increase of Ti content leads to a gradual reduction of quality of the pore structure and of the pore volume in TiPpn-x samples.
In spite of reduction in As (~15%) and Vp (~20%) the use of the direct synthesis at ambient temperature and pressure showed itself to be a better alternative for obtaining titanosilicates with highly regular MCM-41 structure.
Online since: October 2006
Authors: Saul Sánchez-Valdés, M.L. López-Quintanilla
Other authors [10]
has obtained
a reduction in MFR of PE of around 40% after the 2nd extrusion cycle using a corotating twin-screw
extruder with similar conditions than the ones we used.
Although GPC data was not possible to obtain, the MFR results confirms the already accepted fact that the presence of nanoclay increases the viscosity of the blends.
This reduction of only 3°C, even though is not significant could be related with the thermal degradation of polyethylene during the increased residence time of the 2nd step of mixing.
Besides this small reduction could also be related with certain increase in crosslinking and chain branching of LLDPE sample during reprocessing that could increase the degradation temperature in some extent.
Since this increase would lead to amore stable polymer matrix and therefore it would be more difficult to degrade, which is seen in a reduction of only 3°C.
Although GPC data was not possible to obtain, the MFR results confirms the already accepted fact that the presence of nanoclay increases the viscosity of the blends.
This reduction of only 3°C, even though is not significant could be related with the thermal degradation of polyethylene during the increased residence time of the 2nd step of mixing.
Besides this small reduction could also be related with certain increase in crosslinking and chain branching of LLDPE sample during reprocessing that could increase the degradation temperature in some extent.
Since this increase would lead to amore stable polymer matrix and therefore it would be more difficult to degrade, which is seen in a reduction of only 3°C.
Online since: July 2017
Authors: Roto Roto, Indra P. Iqbah, Endang Tri Wahyuni
Among them, photocatalytic reduction seems the most intensively developed method.
Reduction of CO2 in the presence of water and NaOH solution photocatalyzed by TiO2 supported on a polymer, has been reported to produce methanol and methane, accompanied with formic acid and formaldehyde [13].
Improvement of the photocatalytic reduction of CO2 using a simpler method can also be conducted by a modification of TiO2.
Data in Fig. 2 can also be explained based on the band gap energy (Eg).
Fig. 5 demonstrates the enhancement of the methane yield from the CO2 photocatalytic reduction over TiO2/SiO2 in the addition of HCl and HNO3.
Reduction of CO2 in the presence of water and NaOH solution photocatalyzed by TiO2 supported on a polymer, has been reported to produce methanol and methane, accompanied with formic acid and formaldehyde [13].
Improvement of the photocatalytic reduction of CO2 using a simpler method can also be conducted by a modification of TiO2.
Data in Fig. 2 can also be explained based on the band gap energy (Eg).
Fig. 5 demonstrates the enhancement of the methane yield from the CO2 photocatalytic reduction over TiO2/SiO2 in the addition of HCl and HNO3.
Online since: May 2019
Authors: Ahmed Hassan El-Shazly, Mohamed R. El-Marghany, Norhan Nady, Mohamed Nabil Sabry, Mohamed Sameh Abdalghany Salem
Data logger with four thermocouples were used to monitor the inlet and outlet temperature of each side and a pressure gauge was used at the inlet of the feed side.
However, the average pore diameter reduced by around 23% after including (involving) the fillers, and without significant reduction in the membrane porosity (only 2% reduction in the porosity due to the filler inclusion).
For M1 membrane, the permeate flux decreased from 11.85 kg/m2·h at 9000 ppm to 3.45 kg/m2·h at 36000 ppm (70.9% reduction) while for M2 membrane, the flux decreased from 17.3 kg/m2∙h to 7.4 kg/m2∙h (57.2% reduction).
This reduction could a result of salt precipitation on the membrane surface.
However, the average pore diameter reduced by around 23% after including (involving) the fillers, and without significant reduction in the membrane porosity (only 2% reduction in the porosity due to the filler inclusion).
For M1 membrane, the permeate flux decreased from 11.85 kg/m2·h at 9000 ppm to 3.45 kg/m2·h at 36000 ppm (70.9% reduction) while for M2 membrane, the flux decreased from 17.3 kg/m2∙h to 7.4 kg/m2∙h (57.2% reduction).
This reduction could a result of salt precipitation on the membrane surface.
Online since: February 2020
Authors: Zheng Yi Jiang, Lian Jie Li, Hai Bo Xie, Tian Wu Liu, En Rui Wang, Xu Liu
This poses a huge challenge to strip shape control due to the high rolling force caused by the large deformation resistance of AHSSs and large reduction ratio in hot strip rolling.
In addition, the developed FE model is verified through comparing simulated rolling force and rolled strip crown with measured data.
Table 8 lists the rolling force and strip crown Cw40 under various reduction ratio.
It can be found from Table 8 that rolling force increases with increasing reduction ratio, and the influence ratio of rolling force on strip crown Cw40 is 0.0077, which is about one-tenth of effect of WR bending force on Cw40.
Influence ratio of rolling force on strip crown Reduction ratio Rolling force (kN) Strip crown Cw40 (μm) Influence ratio (μm/kN) 0.403 26631 296 0.0077 0.456 29850 322 0.511 32600 342 Fig. 13.
In addition, the developed FE model is verified through comparing simulated rolling force and rolled strip crown with measured data.
Table 8 lists the rolling force and strip crown Cw40 under various reduction ratio.
It can be found from Table 8 that rolling force increases with increasing reduction ratio, and the influence ratio of rolling force on strip crown Cw40 is 0.0077, which is about one-tenth of effect of WR bending force on Cw40.
Influence ratio of rolling force on strip crown Reduction ratio Rolling force (kN) Strip crown Cw40 (μm) Influence ratio (μm/kN) 0.403 26631 296 0.0077 0.456 29850 322 0.511 32600 342 Fig. 13.