Search results

Substitution of bioactive glasses with different transition and rare earth metals such as Cerium, Lanthanum, zinc, manganese, iron, magnesium and silver to change their biological and bioactive response has been studied by a number of research groups [8-13].
Fine-grained quartz was used as a source of SiO2.
(a) SEM of bioactive glasses BG, Ce1 Ce2, La1 and La2 before immersion in SBF respectively Ce1 The Scanning Electron Microscopy (SEM) of bioactive glass samples before soaking in SBF solution are shown in Fig.6(a) which shows different rod type structures and irregular grains of bioactive glass samples which are quite similar to the results observed by Hanan et al. [26].

The surface of the grain part of granite rubble and expanded clay gravel was processed by hydrophobic agent.
Structural changes associated with crack growth and their transition to the rank of internal surfaces of section, along with the processes of hydration of relict binder grains, determine the improvement in the level of mechanical and deformative properties of concrete and expanded clay concrete over time.
In addition, situations are not excluded in which the number of structure-forming cracks per unit volume of a structural block increases with their spontaneous enlargement to the size of cracks-destroyers (volumetric destruction).

The number of core samples had to be limited, due to the fact that the building is listed.
Besides the fibers, the ECC mix design consisted of Ordinary Portland Cement (OPC) 52.5, silica sand with maximum grain size of 300 μm, and silica fume.
It can fill the gaps between cement grains and give mobility to the mix by allowing concrete to flow more easily when energy is applied to it, thus reducing segregation [33].

Where they observed that the changing in the direction of instrument rotational between passes of FSP, increment in the passes’ number, and decrement in the particles of SiC size lead to enriching wear and hardness characteristics.
The excellent particle dispersion produced by the ultra-fine-grained structure in an aluminium matrix.
Aluminium (wt. %) Magnesium (wt%) ZnO (wt%) 98.0 2 0.0 96.0 2 2.0 94.0 2 4.0 92.0 2 6.0 90.0 2 8.0 88.0 2 10.0 To facilitate the melting in the oven, the high purity aluminium wires are cut into small parts, weighed in target quantity (weight proportion wt. per cent) every one of the aluminium tubes, magnesium and zinc oxide with grain size 15-20μm.

Nomenclature A Area of collector [ m2 ] Cp Specific heat capacity, [kJ/ kg K] Dh Hydraulic diameter for non circular tubes such as square ducts, [ m] Fr Heat removal factor G Daily radiation, [MJ/day] h Coefficient of heat transfer, [W/m2K H Rate of incidence of beam or diffuse radiation on a unit area of space, [W2/m4 K] hfg Latent heat of vaporization, [MJ/kg] I Solar insolation of collector, W/m2 k Thermal conductivity, [W/ mK] m Amount of moisture removed, [kg] Mass flow rate, [ kg/s] m1 Mass of water loss md Mass of dried product mf Final moisture content mi Initial moisture content mw Mass of wet product Nu Nusselt number P Perimeter of collector, [m] Pr Prandtl number Qe Heat of vapourisation, [MJ] Qu Useful power, [W] R1 Heat loss coefficient by convection & radiation from plate to cover, [ m2.K/ W] R2 Convective heat loss coefficient from cover to ambient, [m2.K/ W] R3 Conductive heat loss coefficient through insulator, [m2.K/ W] R4 Convective
Table 6: Calculated values for design parameters S/N Parameters Values Equations used 1 Reynolds number 229539.35 (turbulent) Equation (1) 2 Nusselt number 397.71 Equation (2) 3 Coefficient of heat transfer, [W/m2] 12.38 Equation (3) 4 Total heat loss coefficient, [W/m2k] 1.803 Equation (4) 5 Heat removal factor 0.9429 Equation (5) 6 Useful energy collected, [W] 391.50 Equation (6) 7 Collector efficiency, [%] 65.59 Equation (7) 8 Mass flow rate,[ kg/s] 0.01944 Equation (8) 9 Volume flow rate, [m3/s] 0.01753 Equation (9) The heat removal factor of 0.9429, useful energy collected, 391.50 W, collector efficiency, 65.6% and mass flow rate of 0.01944kg/s were obtained for the system.
Mumba, Development of a photovoltaic powered forced circulation grain dryer used in the tropics, Renewable Energy, 6 (7) (1995) 885-862 [11] G.
Lhendup, and Lu Aye, Technical and financial evaluation of a solar dryer in Bhutan, Solar 2005 – ANZSES Conference, Dunedin, Dec. 2005 Appendix Reynolds number, Re (1) where, Reynolds number for a flat plate in turbulent flow is and if the channel through which fluid flows has a non circular cross section.
Nusselt number, Nu [22] (2) The following air properties at 319K were used (extracted from Holman, [23]); , , , , , , .

., MN}, where N represents the number of Esus of the word, Mn(n = 1,2, ..., N) represents the n-th Esu of the word.
Word segmentation is the basis for text processing, we use CTCLAS to preprocess for fine-grained segmentation and POS tagging.
Then the number of occurrences of nouns, adjectives, interjections, onomatopoeia, negative words and adversative words was counted.
Table 3 Sentiment features of text Type Features Sentiment lexicon Positive and negative sentiment strength values, number of sentiment words Punctuation Whether there is a question mark, exclamation POS statistics Numbers of Nouns, verbs, adjectives, conjunctions, onomatopoeia Negative words Number of negative words Adversative words Number of adversative words After selecting the sentiment feature of text, quantify the features to get the text feature vector.
Table 4 CSLS comparative analysis result data Lexicon Number of positive words Number of negative words Accuracy NTUSD 2647 7741 0.77 TUPNL 5565 4467 0.72 (2) Optimizing CSLS Next, we adjust the sentiment strength of the words in CSLS to improve the accuracy of it.

By a suitable selection of the PE spheres fraction and volume percentage, it is possible to modify some important porosity characteristics of the final component, such as the mean pore size, the total pore volume, the pore geometry as well as the pore interconnection number and size.
Since the pore size depends on the starting powder particle size as well as on the grain size in the intermediate stage of sintering, a thermal treatment at low temperature allows to obtain porous materials having nanometric pores.
Figure 5 – SEM micrograph of (a) alumina and (b) zirconia porous materials A limited number of interconnections among pores was observed as a consequence of the low PE volume amount.
On the ground of these results, it can be reasonably supposed that the finer PE fraction allows the development of a more interconnected porosity: in fact, the smaller the spheres, the higher the number of contact points.

The complex-shaped pore path between sand grains in the sand cores and the interfacial forces at the core gas/metal boundary binder the flow towards regions of lower resistance.
Characteristic properties of sand core used in the experiments Sand core characterization Sand type: SH-quartz sand Sand grain size: 0.22- 0.3 mm Specific surface area 170 cm2/g Resin type: self-binding phenol Amount of resin: 1 m/m% Amount of binder: 0.5 m/m% Gas permeability: 250 A steel tube (Ø6x300 mm) designed for venting the evolving gases was placed along the axial centerline of the cylindrical core, 5 mm from the metal/sand core interface [10].
Jnl. of Multiphysics Volume 12, Number 4, (2018) 313-325 [5] Worman, R.A., Nieman, J.R.: A Mathematical System for Exercising Preventive Control over Core Gas Defectes in Gray Iron Castings, TAFS 81, (1973) 170–179 [6] A.

Fly ash is a heterogeneous material composed of a large number of particles of different physical, mineralogical and chemical properties [3].
Fuel and fly ash flow stratify by grain mass to various heights, where these particles constantly swirl around their equilibrium positions.
Grain size, granulometry, particle surface and porosity affect another important property – pozzolan characteristics.

In addition, ETc were used to determine effective rainfall (Er) and to generate hypothetical irrigation schedules to estimate the seasonal or monthly evapotranspiration of applied water (ETaw), where ETaw was an estimate of the ETc minus water supplied by Er [5,6].A great number of studies showed that this method was perfect and developed ETc and widely applied in the most countries [7,8].In China, XU [9]calculating irrigation quota of alfalfa by FAO P-M equation and crop coefficients was studied with the meteorological and the alfalfa experiment data, and estimated irrigation quota under different hydrologic years of alfalfa under different irrigation techniques in Beijing.
The southern Kerqin sandy land was an important production base of commodity grain of Liaoning Province and Inner Mongolia.
Fuxin and Chaoyang located in the southern Kerqin sandy land were the very typical northeast semi-arid region, and also were vital production bases of commodity grain and worsening of the water shortage problems in Liaoning Province in China.As the local major drought-resistant crops and appropriate water-saving crop, more and more corn (Zea mays L.) were produced and their tillage area increasing year on year.