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 2013
Authors: Ekaterina S. Sotova, Anatoly S. Vereschaka, Alexey Anatolevich Vereschaka, S.N. Grigoriev
Effective maintenance of a tool equipped with CI of MCC is possible only at optimal parameters of the technology for sharpening and finishing, since formation of dangerous surface defects in the process of sharpening of MCC can cause a sharp decline in the strength of ceramic CI.In this regard, there is an urgent need to develop methods of further modification of surface properties of a tool of MCC to improve these properties and reduction (healing) of dangerous surface defects.
NMCCincludesthreelayers, and each of them has a strictly functional purpose: • externalwear-resistantlayer 1 contributestofavorable transformation of contact processes and provides maximum reduction of contact stresses and thermal effect of substrate of MCC; • intermediate layer 2 provides a strong adhesive bond between layers 1 and 3, and, besides, it can also perform other functions associated with inhibition of heat flow from cutting area to a tool, and diffusion of elements of the material being machined in the tool material (MCC); • adhesion-strengthening layer 3 provides formation of strong adhesion between the ceramic substrate and NMCC and also provides hardening and healing effects on thin near-surface layers of ceramic material.
In processing, flank wear land VB equal to 0.25 mm was assumed as a criterion of tool failure (it limited the area of "normal" wear).To obtain the necessary information about the components of the cutting forces PzandPy, the universal strain-gauge dynamometer UDM  600 and the computer programme for the complete processing of experimental data were used.
Results and discussion of experimental data Results of the experimental studies are presented in Fig. 2 and 3, and the analysis of these Figures reveals the following.
To develop a model of cutting, experimental data were processed on PC worked out under the program developed by the MSUT "STANKIN".Following the result of the experiments carried out and verification of the adequacy of the resulting model and evaluation of the significance of regression coefficients,the dependence of tool life on cutting modes of turning of steel XVGHRC45 was obtained for: VOK-200: T=23.64v0.22,min (2) VOK-200-(Ti-TiN) (standard technology arc-PVD); T=12.73v0.10,min (3) VOK-200-(Ti-TiN-TiCrAlN, FCVAD technology)T=36.47v1.03, min (4) Thebest result for wear resistance was shown by CI of VOK-200 with developed coating Ti-TiN-(TiCrAl)N (Fig.3).The presented figures show that with the increase of the cutting speed, tool life of all tested ceramic tools
Online since: April 2016
Authors: Farida V. Nazipova, Ruslan R. Safin, Štefan Barcík, Radis Reshidovich Ziatdinov, Aigul Ravilevna Shaikhutdinova, Elena A. Beliakova, Pavel A. Kainov
Results Fig. 1 presents the data obtained during the extraction of substances by cooking of wood chips in distilled water with or without the use of ultrasonic treatment.
The obtained data are listed in Tables 1,2,3.
Analysis of the data shows that with the increasing of time and temperature of treatment of crushed wood the strength of the cement particle board also increases.
The reduction of temperature of treatment twice at the expense of reduction of losses of thermal energy allows not only compensating the cost of ultrasonic processing, but also reducing the cost of production by 7%.
Online since: September 2018
Authors: Oksana V. Germak, Maksim G. Govorukhin, Galina K. Tupoleva, Anastasia E. Dudnik
Complex modernization of local coordinate systems should be aimed at the solution of the following tasks: - inventory and reduction of the number of local coordinate systems; - minimizing the discrepancy between the parameters measured at the local site and the large-scale plan, by creating and implementing new methods for establishing local coordinate systems; - development of training materials to ensure the compatibility of spatial data in the local coordinate system while ensuring legally significant actions; - formation of the federal bank of coordinates of points of state networks in the high-precision geocentric coordinate system of the Russian Federation; - development and implementation of an effective mechanism for strengthening responsibility for the destruction of points of state geodetic networks.
This allows you to locate points in places that are favorable for their long-term preservation and convenient for subsequent use, at the same time there is no need to build expensive external geodetic signs; 3) reduction of the requirements for the density of the initial geodetic base, which makes it possible to drastically reduce the number of strong points; 4) simplicity of organization and high level of automation of work, the ability to perform work at any time of the day and any weather conditions.
To create a domestic GNSS receiver integrated with domestic INS on domestic components, as well as a program for processing data from domestic GNSS receivers.
It may be worth repealing the secrecy of coordinates and heights, taking into account even the public data of space imagery and terrain models. 5.
Online since: May 2009
Authors: R. Amils, E. González-Toril, A. García-Moyano
In situ physico-chemical data were measured in duplicate.
Partial sequences were assembled and the full-length sequences imported to a data base of over 50,000 16S rRNA primary structures by using the aligning tool of the ARB software package (http://www.arbhome.de).
Both 16S rRNA library and CARD-FISH data are in accord and show a strong correlation between the iron gradient and the prokaryotic communities inhabiting the different anoxic areas.
Since iron reduction is favoured when oxygen concentration is relatively low, iron reducing microorganisms are expected to be mainly associated with the sediments.
The main lessons that can be learned from the study of the anoxic sediments of Río Tinto are: i) anoxic conditions favor the reduction of iron, thus imparing the chemical oxidation of sulfides, ii) high ferric iron concentrations inhibit iron reducing activities.
Online since: July 2014
Authors: Zi Zhi Lin, Si Hui Shu
The representing problem is different from the approximation to data points; planar curve provided more information than data points.
Approximate the sampled data points using least square approximation in a given tolerance.
The planar curves supply more information than the discrete data points.
The sampling can be with any high density and accuracy, so we ignore the sampling error in the representing. 3.2 Interpolate the data points and tangent vectors Given the data points along with their tangent vectors, we can construct Bezier segments between each adjacent pair points interpolate these data and tangents.
The final curve along with its control polygon its control polygon In figure 3, the data points and their data points are interpolated by a quadratic B-spline curve.
Online since: May 2012
Authors: Jin Peng Liu, Dong Xiao Niu, Huan Miao Wu, Zhen Ma, Chao Chen Xu
In recent years, be influenced by energy-saving emission reduction and low carbon development policy, the environmental impact issue of thermal power project aroused great attention.
Taking the relative importance and availability of data into account, both qualitative and quantitative analysis of indicators included, we formulate the indicators system.
Analysis of example In this paper, through researching four thermal power projects(A1,A2,A3,A4), get the data of monitored daily concentrations of air pollutants, water quality monitoring reports, environmental protection reports and other information.
Combined the standardized data with the entropy theory calculation process, obtain the objective weight (Q) of C-level indicators.
Using AHP-Entropy combinational weight method to determine weight is attached to the experience of experts, and consider the evaluation indicator transfer objective data’s difference, thus improving the accuracy of evaluation results.
Online since: December 2023
Authors: Qing Lian Li, Jun Sun, Xin Lin Liu, Lan Wei Chen, Jie Song
A new correlation expressed by Bo, We, Kp, X, Co, Ftg is proposed, which yields good fitting for 355 experimental data with a mean absolute error (MAE) of 10.9%.
It includes the methane dewar, high pressure methane tank, vacuum tank, test section, evaporator, mass flowmeter, data acquisition device, and DC power, etc.
Data Reduction The experimental measurement parameters include: temperature and pressure at the inlet and outlet of the test section, temperature of the outer wall of the test section (at 10 different positions), methane mass flow rate.
Heat transfer correlation Based on the experimental data, a correlation of Nusselt number for subcritical methane in vertical tube was proposed as shown in Eq.(4-1).
(4-1) The methane flow boiling heat transfer correlation was based on the mass quality division criterion, which can accurately predict 355 groups of experimental data, with an mean absolute error (MAE) of 10.9% (Fig.7)
Online since: October 2011
Authors: Yan Mei Meng, Quan Zhou, Ying Ning Hu, Dao Yang Li, Xuan Yu, Bing Hua Ou, Hai Feng Pang
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.
Online since: August 2014
Authors: Qiang Xiao, Ru Chun Yang, Wei Li
Crystal data: monoclinic system, space group P2(1), a = 9.0832(11) Ǻ, b = 5.4332(7) Ǻ, c = 12.2464(15) Ǻ, β = 107.809(4)°, V = 575.41(12) Ǻ3, Z = 2, F(000) = 360, Dx = 2.148 Mg m-3, μ = 2.813 mm-1, R = 0.014 and wR = 0.056 for 1988 independent reflections (Rint = 0.0209) and 1932 observed ones (I > 2σ(I)).
Their crystal data was also reported in detail.
Diffraction data of the single crystal were collected at 296(2) K on a Bruker SMART APEX CCD diffractometer equipped with a graphite-monochromatic MoKα radiation (λ = 0.71073 Å) by Crystal clear software.
Crystal data C9H10FIN2O5 Mr = 372.09 Monoclinic, P2(1) a = 9.0832(11) Ǻ b = 5.4332(7) Ǻ c = 12.2464(15) Ǻ α = 90° β = 107.809(4)° γ = 90° V = 575.41(12) Ǻ3 Z = 2 F(000) = 360 Dx = 2.148 Mg m-3 Mo Kα radiation, λ = 0.71073 Ǻ Cell parameters from 8169 reflections θ = 2.47-27.60° μ = 2.813 mm-1 T = 293(2) K Block, colourless 0.07 × 0.07 × 0.08 mm Data collection Bruker SMART APEX CCD diffractometer ω scans Absorption correction: multi-scan ( SADABS; Bruker, 1997) Tmin = 0.806, Tmax = 0.827 7454 measured reflections 1988 independent reflections 1932 reflections with I > 2σ( I ) Rint = 0.0209 θmax = 25.00°, θmin = 1.75° h = −10→10 k = −6→6 l = −14→14 Refinement Refinement on F2 Least-squares matrix: full R [F2 > 2σ( F2)] = 0.014 wR(F2) = 0.056 S = 1.39 1988 reflections 165 parameters 1 restraints H-atoms treated by a mixture of independent and constrained refinement w = 1/[σ2(Fo2) + (0.0434P)2 + 0.0000P] where P = ( Fo2+ 2 Fc2
Data collection: SMART (Bruker, 1997); cell refinement: SMART; data reduction: SAINT (Bruker, 1997); program(s) used to solve structure: SHELXTL (Bruker, 1997); program(s) used to refine structure: SHELXL; molecular graphics: SHELXTL; software used to prepare material for publication: SHELXTL.
Online since: July 2013
Authors: Bin Zhang, Rong Li, Bing Zhen Zhang
The simulation data and the actual operating parameters were compared, and the airflow distribution of bag-type collector was comprehensively learned.
Introduction In the wake of advocating Energy Conservation & Emission Reduction Technology in China, as well as the air pollution prevention and control law has been revised, the pollutant emission standard is more stringent.
Non-uniform airflow distribution can result in the insufficiently operation of some filter bags, and others are overburdened, meanwhile can cause the reduction of the dust removal efficiency.
Showing 12691 to 12700 of 40357 items