Search results

Many schools have been teaching experiments and laboratory construction in the first place, due to restrictions such as school funding experiments, laboratory space and equipment factors, experimental teaching and can not achieve the desired results and the quality of experimental teaching affected.
communications, integrated circuits, software tools, models of human behavior, environmental models, etc.); Elements and components and technology (memory, display, LAN, microprocessors, database management systems, digital-structure modeling and simulation tools, test equipment, etc.); System-level technology (computer systems, human-machine interface, remote communications, WAN, computer image generation, etc.); Application-level technology (manufacturing process simulation, modeling and simulation, such as engineering design); Integrated simulation environment technologies (prototyping, planning, design and manufacturing, training and preparing, testing and evaluation, etc.). 3.2 Network used in simulation systems Computer networks, communication networks, transportation networks, power grids, water supply networks, food supply networks, banking and financial systems, oil pipelines, gas pipelines network, control network, a large number of real complex networks are small-world and scale-free properties
Computer networks, mechanical, chemical, electrical and electronics, the purpose of all these simulation software is designed for engineering design applications, and they all have fully functional.
For example, the computer network curriculum can design a network environment simulation includes computer network equipment, switches, routers, firewall; Mechanical Design courses can design four-bar mechanism, sports gear mechanism, cam mechanism simulation system; Chemical process simulation to design synthetic ammonia production process.

The quality of droplet dispensing, including the volume consistency and positioning accuracy of micro-droplets, will directly affect the assembly performance of connection parts and even the working function of the integrated system.[1,2] However, there are various factors, such as small connecting space, nanoliter-scale volume, light-weight, particular surface properties of droplets, that make it much difficult to the detect the dispensing quality of single microdroplet effectively.
China Mechanical Engineering, 20. 22. (2011) 2513-2519
China Mechanical Engineering, 6. 26 (2015) 789-793

Diesel Engine Fault Diagnosis Based on Rough Sets Hongxia Pan and Jingyi Tian School of Mechanical Engineering and Automation, North University of China, Xueyuan Road 3030051 Taiyuan, China panhx1015@163.com Keywords: Rough Sets, ROSETTA, Wavelet Packets De-Noising, Neural Network, Fault Diagnosis Abstract.
The cylinder head vibration signal is affected by many factors, respond waveform is very complex, both cycle characteristics, and non-stationary and some impact properties.
Vibration signal through the 4 layer wavelet packet transform, time domain and frequency domain analysis, the extraction of 16 change is obvious characteristic values, respectively is: RMS, kurtosis, maximum, kurtosis, peak index, pulse index, margin index, coefficient of sleekness, kurtosis index, eight order moment coefficient, sixteen order moment coefficient, six order moment, peak, spectral variance, harmonic factor, spectral moment about the origin, respectively ( T1, T2, ... , T16 ) said.
Visible, after attribute reduction feature vectors from 16 down to 10, respectively, the mean square value, maximum value, kurtosis, peak index, kurtosis index, eight order, six order moment coefficient of moment, peak, power spectrum variance, harmonic factor, then the value reduction.

Another important factor in determining the damage evaluation of LVI laminates is delamination or out-of-plane damage.
The material properties of the laminates and cohesive layers are listed in Table 3.
Table 3: Mechanical parameters of UTS50/E51 UD composite and cohesive material [4].
The philosophy of the adopted failure initiation criteria as well as the progression law applied to the laminate affected the overall quality of the results.
The percentage difference, when compared to the experiment, is around 7% due to incomplete information about certain material properties and geometry.

In the membrane surface is easy to cause pitting of sulfide products consists of the following eight factors: 1) volume of CO2/H2S > 200. 2) the content of Cl- more than 5000 PPM. 3) have taken place in the steel surface corrosion, especially contact Cl- such as completion fluid, or acidizing treatment with hydrochloric acid. 4) acidification returns fluid caused by the low pH value. 5) lack of relievers or betting relievers frequency is low. 6) corrosive fluids. 7) O2 on bets chemicals or pigging to enter system. 8) test equipment destroyed sulfide product membrane.
Improved low Cr steel L Pigliacampo et al. developed the optimization of low carbon steel 3Cr, to fill in the conventional carbon steel and low alloy steel (carbon and low alloy steels, CLASs) and corrosion resistant alloy steel (corrosion resistant alloys, CRAs), the gap between this kind of material than the CLASs has a higher corrosion resistance, with enough mechanical properties at the same time, so low carbon 3Cr optimization will be the choice of appropriate completion homework.
The material has the following advantages: 1) improve the CO2 corrosion resistant properties, compared with the conventional carbon steel and low alloy steel service life is longer, can extend the well repair period 2) during the completion operations, alternative (sweet) in a separate CO2 corrosion conditions commonly used carbon steel and low alloy steel 3) under the condition of mildly corrosive environment, compared with 13Cr and other corrosion resistant alloy, can recover the operating costs as soon as possible 4) to ensure safety in production, not premature well repair 5) to improve the salvage operation condition.
Under the condition of the same environment, the Super 13Cr martensitic stainless steel has higher resistance for general corrosion and local corrosion than the 13 cr stainless steel, in CO2 and high temperature (about 180 DHS C), and at room temperature and H2S partial pressure under the condition of 0.001 0.003 MPa is almost not affected by the influence of sulfide stress cracking.
Welded Joints Properties Of Super 13Cr Martensitic Stainless Steel Considering Applicability To Field Fabrication[C]//NACE Corrosion2002, paper No.02043, 2002

We can also analyze the influence law of cutting force, heat cutting and the surface quality for all the factors.
The model of geometric criterion is simple, but it is not established by physical condition of chips separation and does not have physical properties.
Through physical standards, the finite element simulation can truly reflect mechanics and physical properties of the workpiece and approach to the real situations.
In the simulation of chips formation, especially modeling in chips area, we need to consider the properties of materials.
It belongs to the normal phenomenon and do not affect the authenticity of simulation result.

The intensification of environmental policy, the adoption of new international standards in the field of environmental protection and waste recycling, the corresponding changes in public consciousness are becoming one of the main factors in the reuse of various waste for the needs of road construction.
The chemical properties and phase-mineralogical composition of ash and slag waste are mainly determined by the composition of the mineral matter of solid fuel and the changes that it undergoes during high-temperature processing in TPP boilers.
The composition and properties of ash and slag depend on the composition of the mineral part of the fuel, the type of preparation system, the combustion mode, the method of collecting and removing, the place of collecting the ash in the collecting devices or at the ash dump.
Chemical and mineral-phase compositions, structure and properties of ash and slag waste depend on the composition of the mineral part of the fuel, its calorific value, combustion mode, method of capturing and removing them, and the place of extraction from dumps.
Physical and mechanical indicators correspond to the following values: slag product content - 24%, the amount of material with a particle size of up to 0.1 mm - 91%; the average value of the density of the dry ash and slag mixture in the loose state is 1.35 g/cm3; in dense - 1.45 g/cm3; the density of the mineral part is 2.3 g/cm3.

Introduction Carbon nanotubes/nanofibers (CNTs/CNFs) have been attracting a great deal of attention for their unique mechanical, electronic, transport, thermal, and vibrational properties [1].
These polarized functional groups could be interacted with H2O molecules that dramatically change the CNTs' surface property from hydrophobic to hydrophilic.
The O/C ratios were obtained by integrating the core level peak area of O(1s) and C(1s), corrected by atomic sensitivity factors based on the empirical peak-area values [16,17] modified for the system's transmission function, as shown in Fig. 1.
These images tell us that the mechanisms of the binding-metal oxides are affected not only by the oxidation level, but also by the ion-adsorption behavior on the open-ended nanotubes.
Popov, Carbon nanotubes: properties and application, Mater.

Introduction Several material properties strongly depend on the differences between ideal and real crystal structure.
The dislocation slip system (s.s.) considered is the primary s.s. of iron, <111>{110}, for which the average contrast factors for edge and screw dislocations were calculated using: c11=237; c12=141; c44=116 GPa.
In particular, the increased defect density seems to affect the solubility toward equilibrium conditions.
Once more, these results confirm the validity of adopting a lognormal distribution in mechanical grinding processes like high energy b.m..
Information on the primary slip system of cuprite (<100>{001}) was taken from the literature and further verified [20], in order to calculate an average contrast factor.

Effect of Microstructure Ti-6Al-4V can be processed and heat-treated to produce a variety of microstructures having considerable differences in fatigue properties [73].
Dislocation slip mainly occurs in the primary α nodules along prismatic and basal planes with the largest Schmid factors [78].
Though different materials can certainly modify these fretting stresses because of the difference in material properties, friction, and wear behavior.
(1) Induce compressive residual stress in the surface layer via a mechanical treatment.
Mechanical Treatments - Compressive Residual Stress.