Search Options

Sort by:

Sort search results by

Publication Type:

Publication Type filter

Open access:

Publication Date:

Periodicals:

Periodicals filter

Search results

Online since: June 2010
Authors: Vytautas Grigas, Alexandra Legha, Rymantas Tadas Toločka, Anatolijus Sulginas
Introduction Training equipment for professional applications should load athletes as close as possible to the real environment of competition [1].
The loading (variable during the stroke) on the oar of indoor rowing machine and simulating the one acting as on-water rowing is a good example [2, 3].
It is one of the main alternatives to approach the on-water rowing performance - the further are the kinematics of oarsman's movements and the equilibrium of the oarsman-boat system [4].
The oar loading during the on-water rowing stroke was measured experimentally and the oar motion was registered by the motion capture equipment [6].
The dependence of the hydraulic loading unit diaphragm linear velocity upon time (a) and dependence of hydrodynamic force on the channel cross-section area at constant velocity (b) Generating Desirable Law of Rowing Force The experimental research of rowing force when exercising on an academic (sculling) rowing simulator in the pool of the Lithuanian Academy of Physical Education and real academic rowing in the Birstonas water sports base on the river Nemunas demonstrated that in both cases the law of rowing force is quite similar for the same athlete.
Online since: June 2012
Authors: Vanderley M. John, Katia R.G. Punhagui, Érica F. Campos, José M.B. González
The different units of products were regularized to tones considering the density 0.7 t/m³ of biomass (15% of water content) for tropical native woods [32, 33], and 0.5 t/m³ of biomass (15% of water content) for planted woods [34].
It is achieved by the definition of age, educational level, professional area, the Brazilian state where one grew up and formed his repertoire housing, and the family income.
The professional area scored professionals of engineering and architecture.
Professional area: a-management and business, b-arts and design, c-mathematical sciences and computers, d-humanities and social sciences, e-communication and information, f-engineering and architecture, g-environment and agricultural sciences, h-health, i-technicians, j-other.
Online since: November 2012
Authors: Xu Dong Xing, Bin Jian Chen
Fuel cell stack is cooled with water cooling method and cooling water becomes hot water with temperature of 60 to 70℃ after bring waste heat from stack away.
Then the cooling water exchanges heat with supplying water in heat exchanger.
One method is with low-pressure water and cooling is realized by the water’s evaporations.
Small water flow is needed in this method and waste heat is taken away mainly by water vapor.
With very little professional maintenance personnel, when there are failures with fuel cells, usually fuel cells are transported back to the production base for maintenance.
Online since: May 2025
Authors: Pham Quang Trung
When sensor 2 (5) signals to move the empty bottles to the pump position (6), water is poured into the bottles.
The water bottle is still being moved along the conveyor belt to the labeling location (16).
Sensor 5 (14) will be used to test the water bottle.
It includes water automatic filling part, bottle capping part and labeling part.
This rate is higher than that of industrial machines currently used in professional factories (beer, soft drinks), but it is acceptable for small-scale production and a small market.
Online since: January 2014
Authors: Li Yang, Jian Qin, Bai Ke Zhao
In this paper, we present a simple and quick method to calculate the tip wear before those professional experimental approaches.
(2) (3) For a general tip shape y(x), it is expected that the van der Waals force between the tip and the substrate when the water bridge in the gap is given by [7]: (4) where D is the vertical distance between probe and substrate, Fvdwwaterand Fvdwair are the van der Waals forces with water and air as medium, respectively.
Tip shape: y = k1x, k1 = 7×10-2; y = k2x3, k2 = 8×10-3, D = 0.2 nm; θp = 00, θs = 00, H = 14×10-20 J in air and H = 4×10-20 J in water [9] From their experimental results (Reference 21, Figure 4), it can be seen that there is an inflection point occurs at RH=25%.
Tip shape: y = k1x2, k1 = 2.5×10-3; y = k2x3, k2= 6.6×10-5, D = 0.2 nm; θp = 00, θs = 00, H =6.5×10-20 J in air and H = 1×10-20 J in water [10].
Online since: January 2014
Authors: Yu Ping Zhao, Yu Hai Xu
Electric Machine Technology Needs Analysis Of the Linear Motor ZHAO Yu-ping1,a, XU Yu-hai2,b 1,2Ningxia Industry and Commerce Professional Technology College, Wencui north Street, Yinchuan City, Ningxia Province, China. 750021 aemail:1048817108@qq.com bemail: nxjdxyh@163.com Key words: Electric processing,Linear motor,Detection system,The drive control system, Technical indicators Abstract This article is in view of the linear motor aspects of application development in the field of electric machine tool equipment technical requirements analysis, linear motor with its high speed and high acceleration transmission has been in processing center, CNC milling machine, lathe, grinding machine, compound machine, laser is widely used in machine tools and heavy machine tool, in the aerospace, automotive, mold, energy, general machinery in areas such as plays a special role.
LINEAR MOTOR IN THE ELECTRIC PROCESSING TEECHNOLOGY IN THE FIELD OF CURRENT SITUATION AND TREND OF DEVELOPMENT The Linear motor and its control test system is made up of primary, secondary, stroma, slider, slippery course, bumper, position feedback system, limit switch (1, 2), the position feedback system joint, base, motor power connectors, baffle, drive and main wiring (motor, limit switch, the power cord, optical ruler line), peripheral equipment (chain, hall sensors, permanent magnetic material, grating ruler, water cooling circulatory system), sensors (including temperature sensor, current sensor, voltage sensor, speed sensor and acceleration sensor in each control system of temperature, current, voltage, power, and the change of parameters such as velocity, acceleration) and encoder, safety barrier, the I/O module, switch, a man-machine interface, field bus, etc.
Movement process using the straight-line double grating ruler and encoder measuring feedback servo system, installed heat source temperature sensor, with circulating water cooling structure, eliminate the influence of temperature rise on the slide stiffness and accuracy.
The typical linear motor product technical indicators: FANUC L17000C3/2 is, maximum thrust 17000 n, continuous thrust 3400 n (cold) / 4080 n (air-cooled) / 6800 (water); The maximum speed of 240 m/min (4 m/s), 30 g, maximum acceleration resolution 1 um.
Continuous thrust 8100 n (water); the maximum speed of 253 m/min.
Online since: September 2016
Authors: Denis Emelyanov, Vladimir Erofeev, Elita Balathanova, Aleksandr Matvievskiy, Irina Erofeeva, Olga Smirnova, Ilia Tretiakov, Vladimir Kalashnikov
We derived the dependences describing how the bioresistance coefficient, the elastic modulus and the water demand depend on the granulometric composition after 3 and 9 months of aging in the environment of filamentous fungi.
It is necessary to get high volume content of maximum concentrated suspension component having low water demand of concrete mix [20, 21].
Elastic modulus (a) resistance coefficient and water demand (b) dependences on granulometric composition after 3 months of aging in the environment of filamentous fungi.
Elastic modulus (a) resistance coefficient and water demand (b) dependences on granulometric composition after 9 months of aging in the environment of filamentous fungi.
Erofeev, Zhelezobetonnye izdelija i konstrukcii: Nauchno-tehnicheskij spravochnik, NPO "Professional", Sankt-Peterburg, 2013
Online since: March 2015
Authors: Lin Sha, Hai Zhu
Due to the water temperature being lower, the dissipated heat is less than absorbed heat, letting the cooling water temperature to gradually increase, as shown in Fig.2 The water-inside pore of the engine The section inside the heat sinks Q1 Q2 G G Fig. 2 Cooling heating system simplifications Note: Q1 is the heat of the engine transmitted to the cooling system; Q2 is the dissipated heat; G is the flow of cooling water.
The formula is shown for the incoming cooling water heat.
The permissible temperature is equal to the water temperature t1 plus t2, and the water temperature increment dt, namely: t2=t1+dt (5) dt can be calculated based on the heat transferred to water and the water current, dt=Qc/(c·ρ·g) (6) Where c is the specific heat, of which the specific heat of water is 4.187; g for coolant flow; ρis the density of water, approximated 1000kg / m3.
The result is: 4min of heating water temperature when the engine water temperature is 25˚C; 5min when the engine water is temperature 40˚C.
References [1] Jia Dapeng: Warmers research Ignition Technology ( Ordnance Society of Professional Committee of tanks and armored vehicles Proceedings, China 2008)
Online since: February 2014
Authors: Fei Wang, Tian Ming Ding, Wei Hua Song
The third part uses the professional statistical analysis software SAS to draw the shellfish and algae carbon curve of marine ranching construction, which provides theoretical reference for considering the carbon sink function of marine ranching construction.
Algae fix inorganic carbon by photosynthesis, and make it into carbohydrates, which provide the basis for productivity of waters[3-6].
A ton of waste paper can produce good quality recycled paper 850 kilograms, saving 3 cubic meters’ wood, at the same time can water-saving 100 cubic meters, saving 300 kilograms of chemical raw materials, saving coal 12000 tons and saving 600 degree [11].
[11]Xiangdong Ma, Jinhua Sun, Zhenyun Hu, "Coevolution of ecological environment and social economic complex system", Advances in water science, Vol. 20, No. 4, pp. 566-571, 2009
Online since: July 2011
Authors: Hong Qiang Fang, Jun Ye
Base on renewal transformation practice of urban buildings, firstly new green reconstruction ideas are put forward aiming at improving and enhancing work performance and safety performance of urban buildings, enhancing ability resist earthquake, typhoon, etc, guaranteeing the safety of people's lives and property, improving the efficiency of resource utilization, energy-saving, land-saving, water-saving, material-saving, protecting and improving the environment, prolonging service life of existing buildings.
The consequences are more than the huge waste of the social resources, and a lot of architectural garbage were piled up around the city, lands were occupied, some of them contains many kinds of the harmful chemicals, which corrode the land surface and pollute the underground water, the human survival environment is damaged at the same time, tearing down old buildings and then constructing new ones blindly destroys the city’s historical landscape ,weakens the city cultural inheritance, thousands of the citys’ style is identical, the urban style were damaged heavily.
The existing urban buildings renewal transformation technical standard system concerned many specialties which ranges from exploration, inspection, identification, evaluation, design, construction, to acceptance of project, and the operational management including construction, structure, structural fire protection ,building energy saving, building electricity, central heating and air conditioning, water supply and drainage, intelligent building, building monitoring and identification and so on was made.
Before the urban building renewal transformation is executed the reliability assessment and evaluation of the building should be taken at first, such as structure reliability, state of maintenance health, architecture function and peripheral public environment, condition of the architectural energy-saving, and fire protection system, water supply system, HAVC system, power supply and lighting system, intelligent system and safety hardware facilities.
It includes multi-professional factors of the existing buildings: buildings, structures, fire control, energy-saving, electricity, heating, ventilation, air-conditioning, supply and drainage of water, intelligent, monitoring and identification of houses.
Showing 1691 to 1700 of 3745 items