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Online since: August 2017
Authors: Samad Dadvandipour, Samad Nadimi Bavil Oliaei, Bahram Lotfi Sadigh
This number is increasing significantly every day.
It is crystal clear that, as data volume surge up number of links and information extracted from these data grows extremely fast, therefore system performance will fall drastically.
To illustrate the concept of multi-scale part production, machining of several features having different sizes on ultra-fine grain tungsten carbide is considered.
However in the case of complicated products and considering the huge number of machine tools and manufacturing processes, this method could help engineers to find out the best matching machine tools based on their manufacturing criteria.
Online since: January 2022
Authors: Mariann Chaussy, Morgan Chabannes, Boubker Laidoudi, David Bulteel, Arnaud Day, Frederic Becquart
The development of primary industries generates a considerable number of plant by-products that can be recovered for this purpose.
Indeed, some monosaccharides (reducing sugars) can electrostatically adsorb on the surface of cement grains, thus limiting access to water for anhydrous grains C3A and C3S (Doudart de la Grée et al., 2017).
It can also be interesting to select carefully the aggregates before their mixing with a specific binder, for example, according to the amount of lignin content and /or soluble components (Delannoy, 2018). 3 TREATMENTS APPLIED TO BIOMASS The studies dealing with the chemical treatment of aggregates or fibers before their mixing with the binder have shown a large number of methods with many treatment agents and operating conditions.
A large number of simple sugars are water-soluble and therefore easily removable under these simple conditions.
A number of methods for anticipating adverse effects have been discussed in this paper.
Online since: July 2013
Authors: Zhong Xia Hu
Algorithm is an ordinary text (or understandable information) and a set of numbers (key) binding, generate unintelligible ciphertext steps, key is used for data coding and decoding algorithm.
Access control is the most important equipment is a firewall, it is generally placed in different domains of the entry and exit, to import IP network packet filtering and according to the enterprise security policy for information flow control, and realize the network address conversion, real-time information audit warn, advanced firewall can also be based on user fine-grained access control.
Construction network security system of electronic commerce based on IPv6 technology Electronic commerce main security threats are: ①information in the network transmission is intercepted by an attacker might through the Internet, public telephone network or in the electromagnetic wave radiation within the mounting device mode, intercepted confidential information, or based on the information flow and the flow, communication frequency and other parameters such as the length of the analysis, to get useful information, such as consumer account number, password.
First, IANA (Internet Assigned Numbers Authority) address assigned to the Regional Internet Registries (RIR), RIR then address assigned to Local Internet Registries (LIR) or Internet Service above characteristics, 0x2001 prefix at the beginning of the second stage (stage 2) using a segment table to find the next 16 bits, and the third stage (stage 3) is a routing barrels of storage than the 32-bit extended prefix, rather than 0x2001 at the beginning of the prefix of the direct use of routing bucket stage2.
Online since: March 2016
Authors: Hasiah Salleh, Mohd Ikmar Nizam Mohamad Isa, Hamizah Nadia Alias@Yusof
The thickness of film deposited on ITO glass substrate can be controlled by varying the number of scans used in electrochemistry method.
Even all films in this study were deposited with the same number of five scans, the thickness were varied for each material.
As reported by Carquigny et al. [19] and Viau et al. [6], electrolyte solvent did affect the thickness of organic polymer thin film deposited by electrochemical polymerization even with the same number of scan.
Formation of defects and grain boundary during film deposition acted as free electron trap centers and highly occurs in thinner film fabrication thus reducing charge mobility.
Online since: September 2006
Authors: Igor S. Golovin
In metals, only a limited number of dissipative mechanisms … can be used to achieve such performance.
It is not wise to mix ordinary materials with their uncountable number of different internal friction (IF) peaks, and real Hidamets with their intrinsic capacity to damp energy of mechanical vibrations.
One can find in the literature of the last century a large number of different mechanisms proposed for high damping and many different solutions for particular practical applications, from improving safety of Skiscribers in Earthquake zones, quality of musical devices and sport equipment to reducing noise in submarines and vibrations in helicopters, saw blades and gravitational wave detectors.
Cu [29] and Al [30], can exhibit relatively high damping due to a contribution of grain boundary dislocations in combination with a significant increase in yield strength as compared with the non-deformed state.
Online since: July 2011
Authors: Sheng Dun Zhao, Yong Yi Li
Because the cross-section of extrusion tap is polygon, not a whole circle, every moment only part of teeth will extrude metal, leading to periodic acted pressure on metal, the change frequency is proportional to the number of edge of extrusion tap and rotational speed, under the periodic pressure, metal occurs plastic flow and deformation, forms internal thread finally.
In the metal internal structure of thread, grain refinement and dislocation density raise bring a better fibrous tissue continuity and higher yield strength
The structure parameters mainly include edge number , height of relief , lobe radius , taper angle of chamfer , length of chamfer , major diameter , pitch diameter and minor diameter of extrusion tap, length of gauging part [17].
The edge number will influence tool life, tapping torque and stability, height of relief and lobe radius will effect tapping torque, the taper angle and length of chamfer will effect the stability of tapping process, the major diameter, pitch diameter and minor diameter of extrusion tap, length of gauging part will effect the precision and surface quality of internal thread
Online since: August 2004
Authors: Ki Bok Kim, Sang Cheon Kim, Jong Whan Lee, Sang Ha Noh
Multivariate analyses on RF impedance of grain and seed have been reported (Lawrence et al., 1998) and some good promising methodologies for moisture content Title of Publication (to be inserted by the publisher) determination are being presented.
The impedance is expressed as; CjXRZ −= (1) where, Z is impedance [ohm], R (ω) is resistance [ohm], XC is capacitive reactance [ohm] and j is the imaginary number, j2 =-1.
The number of optimal factors to be retained is usually determined by cross validation method (Svante and Michel, 1998).
And the jth linear combination or component, tj for PCR and PLSR was represented as (Osborne, et al., 1993, Williams and Norris, 1990); 3052041035211 xwxwxwxwxwt j j j j jj ++++= (9) with ∑ = = p k k n jn yx yx w 1 2 ),(cov ),cov( (10) where, wjn is weight vector, cov notes the covariance, n varying from 1 to p and p is number of variables The results of analyses are summarized in Table 1.
Online since: October 2014
Authors: Xiao Yue Zhang, Kai Ma, Chun Chao Hu, Shan Qiang Feng, Hu Chen, Wen Qing Lan
Applications can issue any number of packets at any time, which not requires prior approval and not notify the network.
Such a system can clearly distinguish and guarantee the quality of each service and provide the most fine-grained quality of service differentiation to network.
Inter-Serv model demands high requirements for equipment, when there exist a large number of data streams in the network, the storage and processing capacity of device will encounter a lot of pressure.
Each queue has a weighted value, also known as the scheduling weight, round scheduling is conducted in queues according to the weight to ensure that each queue shares a certain proportion of service, scheduling weight indicates that the proportion the scheduling resources are used when devices are scheduling the queue packets. 3.2.3 DRR The disadvantage of WRR is that weights is proportional to the number of packets, the network whose average length of the packet is clear is more appropriate to use WRR, while the weight of the queue does not reflect in the actual queue bandwidth in the networks where the queue packet length varies.
Online since: October 2015
Authors: Michéle D.T. Casagrande, Rubens Brazetti, José Adriano Cardoso Malko, Ben Hur de Albuquerque e Silva
To work and develop more this subject is necessary, because as everyone knows Brazil need to improve a lot its roads, primarily and in special the vicinal ones, they are the way of all the agricultural wealth that have been being lost frequently as wasting grains along the path.
Dozens of laboratory equipaments industries Market their own model, with little variation fo color, location of load positioning, engine power, etc., but essentialy similar, because they need to keep there characteristics like number of cycles, load capacity, width and length of the road and others, thet need to be the same as the first one, because they need to be adequate to the standard.
Thus, the test made with asphaltic materials using the LWT can be easily adapted to our case, basically consisting in replacing the recommended material by the soil stabilized and submitted to the action of “come and go” standard wheel movement, under load and cycle numbers fixed conditions, simulating what happens in the site field and concomitantly providing us conditions to evaluate stabilized soil performance.
Results The results presented below from blocks T15, T16 e T19 related to soils and enzymes, refer to the number of LWT wheel passes exactly when the tablet reaches the collapse (impassable); they are grouped by block and tables displaying the alternative specimens and their copies.
Online since: December 2009
Authors: Mohammed Anayet Ullah Patwari, Waleed Fekry Faris, M.H. Ishtiyaq, A.K.M. Nurul Amin
The analysis of amplitude of chatter during machining indicates that noticeable chatter appears in the system when the chip serration frequency is equal to or integer multiple of the prominent natural frequency of the system components. 1.0 Introduction High metal removal rate with a desired quality of surface finish, which is the ultimate objective in machining, depends on a large number of factors, that include chip-tool interaction, cutting temperature, wear mechanism and wear rate, cutting force, chatter and dynamics behavior of the machine tool system.
Though there has been a large number of works on identifying the causes of chatter and its behavior there is still no congruence of opinion on this very vital issue of machining.
The frequency of the secondary serrated teeth formation, Fc, in the cases of turning and thread cutting operations was calculated knowing the length of the portion of the chip in the SEM pictures, L, the coefficient of chip shrinkage, K (determined by dividing the uncut chip length by the actual chip length), cutting speed, V m/min and the number of serrated teeth, n, observed on the SEM picture; using the following formula: Fc )(60 1000 LK nV = [Hz] (1) 3.1.1 Analysis of Chips Produced in Turning and Thread cutting Sample SEM photographs of the top view of the chips formed during these two operations are presented sequentially with necessary micro-sections of some of the chips to have a clear understanding of the mechanism of serrated chip formation.
Apart from these visible serrated teeth, marks of shear of grains running across the whole width of the chip are also observed.
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