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System Properties Hardware section of power distribution station computer monitoring system.
Unbalanced factor alarm: When the three-phase current or three-phase voltage transformation and distribution system imbalance (customizable range), the computer can automatically record the time, station number, loop through multimedia speakers sound alarm names
Resulting in system crash, software crash, system files are missing. ③Due to the different means of communication and surveillance systems used for event recording mode, the communication time is very important, it requires fast response aspects of surveillance systems have higher requirements. ④Interface capacity is not enough, the data of switch knife cannot be into the monitoring system so that intuitive wiring diagram is affected.
Beijing: Mechanical Industry Press, 2004; [3] Yang Yue.
Beijing: Mechanical Industry Press, 2003; [4]Zhang Wen-Liang,Tang Guang-Fu, Zha Kun-Peng etal.

The track mobile robot has better cross-country property.
Design of Mechanical System The robot composes of four parts: traveling system, steering system, driving system and control system.
According to the parameter requirement of the stair, the footstep, the road order and the passageway in “The General Principles of Public Building Design”, the robot has been designed as 0.8m in width and 1m in length to climb stairs of 0.175m in height, 0.26m in width and 1m in length Although the radius of the wheel r should not affect the robot’s undulation amplitude and passing capacity, a smaller r may result in stronger impact by the uneven road, and affects the comfort degree of riding.
Analysis of Gear Train Transmission Ratio During driving, the automatic switching between rotation and revolution of the wheel system is a key factor that affects the robot’s regular working performance.
Seat Angle Analysis The maximum inclination angle of the robot is an important parameter that affects its dynamical balance feature and comfortable riding.

Thus, limited fiber damage and residual stresses will occur, leading to good mechanical material properties.
Mainly the specific properties taking into account the density of materials are important factors in lightweight engineering; however, they are not in any case superior for unreinforced light metals like aluminum or magnesium alloys as compared to steel, because the absolute mechanical performance of light metals is generally lower.
The orientation of fibers has a significant influence on the final mechanical properties of the composite.
Results - Mechanical Properties.
Results - Mechanical Properties.

To overcome the flaw of the mechanical movement an electronically tunable reflectarray antenna based on non-linear properties of Liquid Crystal materials has been introduced.
Non-linear material properties have been used to develop an algorithm based on Method of Moment, for dynamic phase distribution of three resonant elements.
Liquid crystal materials can be realized as a dynamic phase control strategy in reflectarrays due to their non-linear dielectric properties [4, 5].
Table 1 summarizes the properties of non-linear dielectric materials that are used to design the reflectarray resonant elements.
Therefore a MoM algorithm for dynamic phase range based on non-linear material properties has been established as shown in Eq. 4

Additives such as recycled copper tailings and animal proteins also improve the properties of masonry mortar.
Thus, the optimum percentage of replacement that is the best in order to preserve the properties of mortar is at 10% cement replacement [11].
The main factor on doing this is the particle size of the glass wastes that are being used.
[4] Jozef, Jasiczak and Zielinski, K, Effect of protein additive on properties of mortar, J. of Cement and Concrete Composites, ScienceDirect. 28(5) (2006) 451-457
[8] Cheah Chee Ban and Ramli, M., Properties of high calcium wood ash and densified silica fume blended cement, International Journal of the Physical Sciences, 6(28) (2011) 6596-6606

Introduction The riveting joint is the main connection to fasten two thin-walled sheet-metal parts in aircraft assembly, which affect aircraft’s safety and fatigue life.
The materials properties and geometrical parameters of the riveting joint structure are as shown in Table 2 and Fig 3(a).
Table 2 Material properties of the riveting joint structure Material brand Elastic modulus (GPa) Poisson's ratio v Yield strength (MPa) density （kg/m3） 2A12-T4 2024-T3 73 73 0.33 0.33 368 345 2790 2790 (a) (b) Fig 3 Instance of finite element analysis Fig 4 Riveting force in the process The finite element model of instance is as shown in Fig 3(a).
FEA modeling of setting and mechanical testing of aluminum blind rivets.
Mechanical Science and Technology for Aerospace Engineering, 2009(4): p.514-516, In Chinese

Studies of Pd- Ag Thin Film for Hydrogen Sensor Zhiting Geng1,2 and Qing He1 1 School of Energy Power and Mechanical Engineering, North China Electric Power University, Beijing100089, China 2 School of Materials Science & Engineering, Tsinghua University, Beijing100084, China aqhgzt@mail.tsinghua.edu.cn Key words: Pd-Ag alloy; Magnetron sputtering; Hydrogen Sensor; Thin film Abstract.
There are different at the sensing properties and detection principle of gas sensitive materials.
Hydrogen sensor detection principle is based on physical or chemical property change of gas sensitive material after the adsorption of hydrogen.
Hydrogen gas sensitive element is the core component of hydrogen sensor, testing results was directly affected by its performance.
Working temperature is one of the most important influence factors for hydrogen sensor.

Specific steps: (1)to find out the components of the foundation soil, that is determining the size and content of the large mass, such as rocks, tree roots and so on, to avoid the large objects becoming obstacles to the construction of cement-soil; (2)to determine the naturally stable moisture content of soil, while the dosage of cement-soil keeps the same, the strength of cement-soil increases with the decreasing of moisture content; (3)to determine the organic content: a high content of organic matter in soil will hinder the hydration reaction of the cement, and affect the strength increasing of cement-soil, so we must find out the amount of the organic matter, determine its influence degree on the strength of cement-soil, and take the corresponding measure; (4) to determine the PH value and sulfate content of soil, if the PH value is low, lime can be used to have a balance, and the sulphate resistant cement or other admixture should be chosen when the sulfate is too much; (5)to
carry out the physical property tests of soil, which can provide design conditions through the data of soil’s specific gravity, dry density, natural bulk density, liquid limit, plastic limit, compressibility, compression modulus and so on.
; is pile body’s strength reduction factor; is the empirical coefficient for settlement calculation.
Properties of concrete containing scrap-tire rubber-an overview[J].
[5] W J Staszewski, Structural and mechanical damage detection using wavelets, The Shock and Vibration Digest, 1998,130 (6):2527 [6] Nevzorov A L, Kozmin D D,Aksenov S E, et al.

For reliable operation in such extreme conditions, it is necessary that the material of the parts obtained by 3D printing has cold resistance, i.e. retained its mechanical properties and remained plastic at low temperatures [5-10].
Despite the appearance of a number of publications on the study of the structural features and properties of metals obtained on the basis of 3D printing technology, there are currently no such studies carried out in this work [14-15].
Impact bending test results of steels As the analysis of the results of testing steel samples for impact bending, cut along and across the direction of surfacing, has shown, steel 08Mn2Si has a rather low anisotropy of properties ~ 4%, for steel 07Cr25Ni13 this indicator is ~ 8%.
To simplify the analysis and systematization of the data obtained during the test, as well as after processing the image of the fracture of the sample, it is advisable to load the data into a special "Database of mechanical properties and fracture parameters of materials obtained on the basis of 3D printing".
Merkushev, Analysis of the structure and mechanical properties of the Co – Cr – Mo alloy obtained by 3D printing, Physics of Metals and Metal Science. 120(12) (2019) 1271-1278

The present investigation is on the effect of red mud on the mechanical properties and durability of the geopolymer paste in sulphuric and acetic acid solution.
Being extremely aggressive in nature, it quickly reacts with the lime, (CaOH)2 in the concrete to form gypsum and causes increase in volume of concrete by a factor of 2.2 [5].
Among the geopolymers, RM30 is least affected by sulphuric acid and has minimum strength loss after 86 days.
The stability of hydration product is not affected much.