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Online since: January 2016
Authors: Krzysztof Cwalina, Piotr Rajchowski, Jarosław Sadowski
MEMS (Micro Electro-Mechanical Systems).
One of them is a scale factor [1], defined as a linear deviation relative to the real value.
During research work, it was found that the method of mounting the measuring unit affects the accuracy of location estimation of a moving person.
This method has a property of sin(x) / x impulse response low-pass filter.
One of them is a scale factor [1], defined as a linear deviation relative to the real value.
During research work, it was found that the method of mounting the measuring unit affects the accuracy of location estimation of a moving person.
This method has a property of sin(x) / x impulse response low-pass filter.
Online since: October 2011
Authors: Jun Ling Niu, Lei Liu, Quan Guo Zhang
Effect of biogas production characteristics of dry anaerobic fermentation of wheat straw pretreated by a microbial community with high cellulose-degradation ability
Niu Junling1,a, Liu Lei1,b, Zhang Quanguo2,c
1 Zhengzhou Institute of Aeronautical Industry Management,Zhengzhou 450002,China
2 College of Mechanical and Electrical Engineering, Henan Agricultural University, Zhengzhou 450002, China
aniujl72@163.coml, bliulei@zzia.edu.cn, czquanguo@163.com
Keywords: wheat straw; pretreated; composite microbial system for degrading cellulose; dry anaerobic fermentation
Abstract: The study on the changes of composition and content reducing sugar of wheat straw after pretreated with composite microbial system for degrading cellulose was carried out, and the experimental study on the dry anaerobic fermentation of the pretreated wheat straw was followed.
To improve degradation property and dry fermentation gas production efficiency of straw, we should preprocess straw at first.
Inoculation amount 5% (bulk factor), and incubated at 50 °C under static conditions and with dissolved oxygen in the range of 0.02~0.4mg·L-1.
Comparative analysis of reducing sugar content Reducing sugar is the uppermost simple compounds which can be used in microbial fermentation process, fermentation in the early raw material of the reducing sugar, reducing sugar amount of raw material in early fermentation will directly affect the startup speed and fermentation efficiency of the whole fermentation reaction [10].
To improve degradation property and dry fermentation gas production efficiency of straw, we should preprocess straw at first.
Inoculation amount 5% (bulk factor), and incubated at 50 °C under static conditions and with dissolved oxygen in the range of 0.02~0.4mg·L-1.
Comparative analysis of reducing sugar content Reducing sugar is the uppermost simple compounds which can be used in microbial fermentation process, fermentation in the early raw material of the reducing sugar, reducing sugar amount of raw material in early fermentation will directly affect the startup speed and fermentation efficiency of the whole fermentation reaction [10].
Online since: January 2013
Authors: Bo Sun, Guang Yu Hong, Ming Tao Xu, Wen Jian Wang
Heat transfer performance of glazed units in dual airflow windows
Sun Bo1, a, Hong Guangyu1, b, Xu Mingtao1, c, Wang Wenjian2, d
1School of Mechanical and Power Engineering, Harbin University of Science and Technology, Xuefu Road 52, Harbin150080, China
2Heating Power Branch, Qiqihaer Heping Industry (group) Co., Ltd, Longhua Road 208, Qiqihaer 161000, China
asunbosting@sina.com, bhong.guangyu@tom.com, cljr1204@sohu.com, dwwjt23@163.com
Keywords: Dual airflow windows, Glazed units, Heat transfer, U value, Calculation model.
Consequently heat transfer performance of glazed units becomes a restrictive factor for dual airflow windows and need to be researched in depth.
For example, a 1.5m dual airflow window with 1.1m visible height, the range of equivalent height is from 1.1m to 1.5m.We chose the equivalent height because the gaps in glazed unit is far larger than the cavities in frame on the direction of height so that is difficult for air motion in the cavities to affect convection in the center of glazed unit.
This conclusion also applies to conventional windows for improving thermal insulation property.
Consequently heat transfer performance of glazed units becomes a restrictive factor for dual airflow windows and need to be researched in depth.
For example, a 1.5m dual airflow window with 1.1m visible height, the range of equivalent height is from 1.1m to 1.5m.We chose the equivalent height because the gaps in glazed unit is far larger than the cavities in frame on the direction of height so that is difficult for air motion in the cavities to affect convection in the center of glazed unit.
This conclusion also applies to conventional windows for improving thermal insulation property.
Online since: July 2013
Authors: Nigamananda Das
It also finds application in solid coatings due to superior solvent properties.
Further improvement on catalytic performance could be possible by fine tuning of morphology and surface properties.
Further variation of Pd content in the range 0.1 to 1.0 wt% and H2 flow (10-30 ml/min), the overall acetone conversion was reduced without affecting the MIBK selectivity.
Vaccari, Hydrotalcite type anionic clay: Preparation, properties and applications, Catal.
Wu, Influence of synthesis method on the properties and catalytic performance of MCM-49 zeolites, Catal.
Further improvement on catalytic performance could be possible by fine tuning of morphology and surface properties.
Further variation of Pd content in the range 0.1 to 1.0 wt% and H2 flow (10-30 ml/min), the overall acetone conversion was reduced without affecting the MIBK selectivity.
Vaccari, Hydrotalcite type anionic clay: Preparation, properties and applications, Catal.
Wu, Influence of synthesis method on the properties and catalytic performance of MCM-49 zeolites, Catal.
Online since: March 2006
Authors: Y.R. Feng, Chun Yong Huo, C.J. Zhuang, Zhuo Zhuang, Xiao Bin Yang, Julaiti Maitirouzi
ZHUANG
4
1
Xi'an Jiaotong University, Xian 710049, China
2
Dept. of Engineering Mechanics, Tsinghua University, Beijing 100084, China
3
School of Mechanical Engineering, Xinjiang University, Wulumuqi 830008, China
4
Tubular Goods Research Center of CNPC, Xian 710065, China
a
yxb02@mails.tsinghua.edu.cn, bzhuangz@mail.tsinghua.edu.cn, cjmamat@eyou.com
Keywords: Dynamic fracture mechanics, finite element, full-scale blast, CTOA criterion, pipeline
Abstract.
The behavior of the high pressure gas is one main factor determined the propagation or arrest of the crack.
The assumption is made out of the consideration that coherence is found in the tendency of both, and vn, k+1 at the left end of the equation is an attempt value, which only affects computation speed and convergence, instead of computation precision.
In turn, (CTOA)C is a material property dependent on the temperature, T, the crack speed, v, and the thickness of the pipe wall, h.
The behavior of the high pressure gas is one main factor determined the propagation or arrest of the crack.
The assumption is made out of the consideration that coherence is found in the tendency of both, and vn, k+1 at the left end of the equation is an attempt value, which only affects computation speed and convergence, instead of computation precision.
In turn, (CTOA)C is a material property dependent on the temperature, T, the crack speed, v, and the thickness of the pipe wall, h.
Online since: December 2009
Authors: Fouad Cheaitany, Thomas Peters
deposit
substrate material powder
heat affected zone
laser beam
melt pool
Fig. 1 Laser build-up welding
High power density laser build-up welding with CNC precision
Fouad Cheaitany
a and Thomas Peters
b
Sulzer Innotec, Winterthur, Switzerland
a
email: fouad.cheaitany@sulzer.com, bemail: thomas.peters@sulzer.com
Keywords: Laser Welding, Laser Build-up Welding
Abstract.
Due to the low energy input the heat affected zone is very small and usually the dilution between the deposit and the substrate material is very low.
Laser build-up welding is a non-contact process with no tool wear or mechanical forces on the work piece.
Build-up weld repair (left) and modification (right) on IGT blade shrouds 3.2 Mold Tool Application The key success factor in mold tool repair or modification, besides the need for a defect-free weld quality, which does not allow pores, is the avoidance of distortion.
To preserve the wear and corrosion resistance properties, a low dilution between the thin Stellite™ layer and the substrate material as well as a low porosity i.e.
Due to the low energy input the heat affected zone is very small and usually the dilution between the deposit and the substrate material is very low.
Laser build-up welding is a non-contact process with no tool wear or mechanical forces on the work piece.
Build-up weld repair (left) and modification (right) on IGT blade shrouds 3.2 Mold Tool Application The key success factor in mold tool repair or modification, besides the need for a defect-free weld quality, which does not allow pores, is the avoidance of distortion.
To preserve the wear and corrosion resistance properties, a low dilution between the thin Stellite™ layer and the substrate material as well as a low porosity i.e.
Online since: January 2016
Authors: Boris Bielek
Green Architecture
The alternation of the mechanical manufacturing age with the age of informatics is indisputably reflected in the architecture which requires an interdisciplinary approach and integrated concepts.
Ventilation is a factor that most affects the annual energy demands of a building.
They can also partially take over the task of a system for the coordination and optimization of the relationship of environmental technology to the building construction elements that are able to utilize natural physical phenomena (e.g. elements with the application of phase change materials etc.); · The strategy of the interaction of a landscape and greenery affects the ecology in the macrostructure of an environment and conditions the proper selection or utilization of a locality for the purpose intended and functioning of a building – Fig. 5.L.
Bielek, Project of physical properties experimental investigation of double-skin transparent energy climate façade of Slovak national bank building, in: International conference Sustainable Building & Solar Energy, Brno, 2001, pp.37-39
Ventilation is a factor that most affects the annual energy demands of a building.
They can also partially take over the task of a system for the coordination and optimization of the relationship of environmental technology to the building construction elements that are able to utilize natural physical phenomena (e.g. elements with the application of phase change materials etc.); · The strategy of the interaction of a landscape and greenery affects the ecology in the macrostructure of an environment and conditions the proper selection or utilization of a locality for the purpose intended and functioning of a building – Fig. 5.L.
Bielek, Project of physical properties experimental investigation of double-skin transparent energy climate façade of Slovak national bank building, in: International conference Sustainable Building & Solar Energy, Brno, 2001, pp.37-39
Online since: July 2017
Authors: Horia Octavian Manolea, Sanda Mihaela Popescu, Mihaela Jana Ţuculină, Florian Obădan, Florin Dan Popescu, Rodica Mercuţ, Monica Scrieciu, Oana Andreea Diaconu, Ionela Teodora Dascălu
TiUnite and ZiUnite implant surfaces exhibit high levels of osseointegration that confirmed their advanced osteoconductive properties.
A successful development of a surface modification for ZrO2 implants analogous to that of the titanium SLA surface should result in comparable interfacial biomechanical properties with titanium SLA surface.
Another strategy of osseointegration would be grafting of extracellular matrix proteins or growth factors, which could accelerate the healing and anchoring of these biomaterials.
Insufficient sample size may also have affected the results.
Mechanical properties and short-term in vivo evaluation of yttrium-oxide-partially-stabilized zirconia.
A successful development of a surface modification for ZrO2 implants analogous to that of the titanium SLA surface should result in comparable interfacial biomechanical properties with titanium SLA surface.
Another strategy of osseointegration would be grafting of extracellular matrix proteins or growth factors, which could accelerate the healing and anchoring of these biomaterials.
Insufficient sample size may also have affected the results.
Mechanical properties and short-term in vivo evaluation of yttrium-oxide-partially-stabilized zirconia.
Online since: November 2022
Authors: Nadjem Bailek, Mohamed H. Yehia, Muhammed A. Hassan, Nabeel Abed, Adel Khalil
Experimental correlations for its key thermal properties are reported in [14] under different operational temperatures.
Thermophysical properties The numerical modeling of an equivalent single-phase nanofluid flow can be performed via the correlations (1)-(4) to obtain the thermal properties of the nanofluid mixture based on the properties of the base fluid and the nanoparticles, in line with the volume fraction (∅) of the solid nanoparticles.
The variation of thermal properties of the working pure fluid and nanofluids over the range of examined inlet temperatures are presented in Figure 3.
These properties are calculated based on the models in Equations (1)-(4).
The turbulence is characterized by fluctuated and random flow field properties, which adds more stress to the fluid.
Thermophysical properties The numerical modeling of an equivalent single-phase nanofluid flow can be performed via the correlations (1)-(4) to obtain the thermal properties of the nanofluid mixture based on the properties of the base fluid and the nanoparticles, in line with the volume fraction (∅) of the solid nanoparticles.
The variation of thermal properties of the working pure fluid and nanofluids over the range of examined inlet temperatures are presented in Figure 3.
These properties are calculated based on the models in Equations (1)-(4).
The turbulence is characterized by fluctuated and random flow field properties, which adds more stress to the fluid.
Online since: October 2014
Authors: Bo Zhu, Shan Shan Zhou, Bao Lei Chen, Jian Gao, Yong Wei Li, Yong Lian Sun
These problems affect the properties of polymerization seriously.
As a key factor of ATRP, catalyst system should have high tendentiousness to the formation of -X and high selectivity in the process of atom transfer.
Using this property, we can combine many kinds of functional polymers which have specific structure and are easy to be characterized.
Because of the difference between the properties of backbone and branched chain, grafted copolymer is often used as emulsifying agent, hydrotropic agent, surface active agent, phase transfer catalyst, antistatic agent, biomedical material and so on.
Because of having highly branched three-dimensional ball structure and lots of terminal groups, hyperbranched polymer shows entirely different performance from its corresponding linear molecules, such as low viscosity, no chain entanglement, good high-solubility and some other good properties.
As a key factor of ATRP, catalyst system should have high tendentiousness to the formation of -X and high selectivity in the process of atom transfer.
Using this property, we can combine many kinds of functional polymers which have specific structure and are easy to be characterized.
Because of the difference between the properties of backbone and branched chain, grafted copolymer is often used as emulsifying agent, hydrotropic agent, surface active agent, phase transfer catalyst, antistatic agent, biomedical material and so on.
Because of having highly branched three-dimensional ball structure and lots of terminal groups, hyperbranched polymer shows entirely different performance from its corresponding linear molecules, such as low viscosity, no chain entanglement, good high-solubility and some other good properties.