scholarly journals Silicon content in beers from Korean market and estimation of its alimentary uptake

2013 ◽  
Vol 31 (No. 4) ◽  
pp. 382-389 ◽  
Author(s):  
J.-H Lee ◽  
K.H. Choi ◽  
S.R. Park ◽  
S.A. Shin ◽  
S.A. Kang ◽  
...  
Keyword(s):  
Silicon Content ◽  
Unit Price ◽  
Men And Women ◽  
Si Content ◽  
Korean Market

Silicon content of Korean domestic beer was approximately 13.2 mg/l, which was 142% higher than 9.24 mg/l in imported beer. The contents of Ca and Mg were in the range of 31–33 mg/l and 39-41 mg/l, respectively, which were similar in Korean domestic and imported beers. Through beer ingestion, the men’s average Si intake was approximately 24.3 mg/day, which was 195% higher than the women’s average Si intake (12.4 mg/day). In addition, it was found that 20–29 aged men and women took approximately 33.7 and 25.1 mg/day of Si, respectively, which are higher Si intakes through beer ingestion as compared to other age ranges. As to people in other age-ranges, the women’s Si intake through beer ingestion was half that of men’s. Domestic beer-1 and beer-2 had 8.50 and 6.45 Si μg/won of Si content per unit price, respectively. Taken together with these results, it was estimated that the more expensive the price of beer, the lower the Si content per unit price. Therefore, it is supposed that the cheap Korean domestic beer is an effective supplier of Si, the beer being considered the major resource for Si intake by humans inKorea.  

scholarly journals Alkalinity–silicon ratio as an assessment factor for the efficiency of silicate slags in wetland rice

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Thoppil Sreenivasan Sandhya ◽  
Nagabovanalli Basavarajappa Prakash
Keyword(s):  
Silicon Content ◽  
Chemical Properties ◽  
Magnesium Content ◽  
Wetland Rice ◽  
Agronomic Efficiency ◽  
Economic Production ◽  
Incubation Experiments ◽  
Calcium And Magnesium ◽  
Si Content ◽  
Assessment Factor

AbstractSilicate slags are one of the most widely used silicon (Si) source in agriculture. Even though the agronomic significance of slags has been demonstrated in several crops, only a few attempts were made to evaluate these Si sources based on their chemical composition. The main objective of this study was to characterize different silicate slags based on their chemical properties and to explore the effect of these chemical properties on the yield, and Si uptake in wetland rice, and dissolution of Si into the soil. Slags were characterised for pH, calcium and magnesium content (alkalinity, A), silicon content, 5 day Na2CO3 + NH4NO3 extractable Si content, and alkalinity to Si ratio (A/Si). Greenhouse and incubation experiments were also conducted using different silicate slags and wollastonite applied at the rate of 300 kg Si ha−1. Slags with A/Si < 3 were found to be ideal Si sources for the economic production of wetland rice and found consistent in increasing soil Si content and rice Si uptake. We conclude that the A/Si ratio of slags can be used as an important parameter to assess the agronomic efficiency of silicate slags in wetland rice.

The Silicon Content of Body Fluids

1982 ◽  
Vol 27 (1) ◽  
pp. 17-19 ◽  
Author(s):  
J. W. Dobbie ◽  
Mary J. B. Smith
Keyword(s):  
Comparative Study ◽  
Amniotic Fluid ◽  
Atomic Absorption ◽  
Absorption Spectroscopy ◽  
Pancreatic Juice ◽  
Atomic Absorption Spectroscopy ◽  
Silicon Content ◽  
Healthy Subjects ◽  
Clinical Procedures ◽  
Si Content

Samples of bile, pancreatic juice, cerebrospinal, pleural, peritoneal, synovial and amniotic fluid obtained from patients during routine clinical procedures were analysed for their silicon (Si) content by atomic absorption spectroscopy (AAS). Similar Si concentrations were found in each fluid, while these in turn were shown to be similar to the concentration of Si in the serum of 50 healthy subjects (mean serum Si 21.5 μmol/l, SD±4.5). The concentration of Si in 24-hour collections of urine from 50 healthy subjects was also determined (mean urinary Si 194 μmol/l, SD±94). A comparative study was made of serum Si levels in nine different species of domesticated animal.

Effect of Si, Sr Additions on Microstructure and Mechanical Properties of AZ91 Alloy

2007 ◽  
Vol 546-549 ◽  
pp. 179-182
Author(s):  
S.B. Li ◽  
Zhi Wen Zou ◽  
Shou Mei Xiong
Keyword(s):  
Mechanical Properties ◽  
Silicon Content ◽  
Room Temperature ◽  
Chinese Script ◽  
Az91 Alloy ◽  
Permanent Mold ◽  
Remarkable Effect ◽  
Mg2si Phase ◽  
Β Phase ◽  
Si Content

In present work, Si and Sr elements were added into AZ91 alloy and cast directly into test samples using permanent mold. Mechanical properties of the samples at room temperature were evaluated by tensile test and the microstructure was analyzed. The results show that β-phase (Mg17Al12) of AZ91 alloy decreases with the addition of Si element and Mg2Si phase forms at the same time. Irregular Mg2Si phase precipitates preferentially at the grain boundaries at a low silicon content level. With the increase of the Si content, Mg2Si phase shows a complicated “Chinese- script” shape distributed at the grain boundary which leads to a lower ultimate tensile strength. Subsequently, the addition of Sr element has a remarkable effect on the form and distribution of Mg2Si phase of AZ91-Si alloys.

The Crystal Structure and Magnetic Property of Bi-Substituted Nd2Fe17-x-yTixSiy Intermetallic Compounds

2014 ◽  
Vol 644-650 ◽  
pp. 4950-4955 ◽  
Author(s):  
Li Mei Sun ◽  
Song Bai Han ◽  
Yun Tao Liu ◽  
Dong Feng Chen ◽  
Xiang Feng Liu
Keyword(s):  
Crystal Structure ◽  
Silicon Content ◽  
Unit Cell Volume ◽  
Magnetic Measurements ◽  
Crystallographic Structure ◽  
X Ray Diffraction ◽  
Rietveld Refinements ◽  
X Ray ◽  
Si Content ◽  
Ti Content

The synergetic effects of the substitution of Ti and Si for Fe on the crystallographic structure and magnetic properties of Nd2Fe17-x-yTixSiycompounds have been comprehensively investigated by means of x-ray diffraction, neutron diffraction and magnetic measurements. Rietveld refinements of the diffraction data indicate that all the samples crystallize in the rhombohedral Th2Zn17-type structure. For a given Ti content, thea-axis and the unit cell volumeVof Nd2Fe17-x-yTixSiydecrease linearly with increasing silicon content, while thec-axis behaves complicatedly dependent on different Ti content. The site occupancies of Ti and Si in the crystallographic sites significantly change compared to what is observed in the corresponding singly substituted compounds. TheTCof doubly substituted Nd2Fe16.5-yTi0.8Siyand Nd2Fe16.5-yTi0.5Siyis higher than that of singly substituted Nd2Fe16-ySiyfor a lower Si content while the converse behavior is observed for a higher Si content. For a given Ti content, theTCof Nd2Fe17-x-yTixSiycompounds increases with increasing Si content and theMsfirst increases and then decreases. TheMsof Nd2Fe17-x-yTixSiydecreases with the increase of Ti content.

Effect of Cooling Rate and Si Content on Solidification Characteristics of Silicon Steel during Near-Rapid Solidification

2010 ◽  
Vol 146-147 ◽  
pp. 1247-1251
Author(s):  
Lei Wang ◽  
Xian Yong He ◽  
Qin Peng ◽  
Rong Yang ◽  
Qi Jie Zhai
Keyword(s):  
Cooling Rate ◽  
Silicon Content ◽  
Physical Simulation ◽  
Silicon Steel ◽  
Strip Casting ◽  
Contraction Rate ◽  
Linear Contraction ◽  
Si Content ◽  
Equiaxed Grains ◽  
Twin Roll

The solidification characteristics of silicon steel in twin roll strip casting was studied by physical simulation. The experiments were designed to approximate the solidification conditions of twin roll strip casting. The strips with different cooling rate and different silicon content were prepared. The results show that the solidification structures of the strips with different cooling rate and different Si content are composed of columnar and equiaxed grains, and the solidification structures vary significantly. And with the decrease of cooling rate, the linear contraction rate decreases.

Mechanical Properties of AlSi9Mg Alloy with a Sodium Modifier

2014 ◽  
Vol 223 ◽  
pp. 78-86
Author(s):  
Tomasz Lipiński ◽  
Paweł Szabracki
Keyword(s):  
Mechanical Properties ◽  
Aluminium Alloys ◽  
Silicon Content ◽  
Eutectic Phase ◽  
Coarse Grained ◽  
Hypoeutectic Alloy ◽  
Β Phase ◽  
Two Component ◽  
Si Content ◽  
Direct Use

Al–Si alloys are among the most popular casting metals. Two-component aluminium alloys with silicon are not suitable for direct use after melting. Subject to their silicon content, Al Si alloys have a coarse-grained eutectic phase, and alloys with more than 13% Si content also feature large crystallites or β-phase needles. The β-phase is hard, but also fragile. Large crystallites are good planes of division, and they reduce the mechanical properties of alloys.In this study, the Al-9% Si alloy was refined with a sodium modifier. The modifier was added to the mould by the in-mould method. The modifier's influence on the microstructure and mechanical properties of the alloy was presented graphically. The results of the analysis indicate that the compound modifier influenced the evaluated properties of the Al-9%Si hypoeutectic alloy.

Influence of Silicon Content and Nature of the Template Molecule on Physico-Chemical and Catalytic Properties of SAPO-5

1992 ◽  
Vol 57 (4) ◽  
pp. 826-835 ◽  
Author(s):  
Jochen Jänchen ◽  
Vladimir Penchev ◽  
Elke Löffler ◽  
Barbara Parlitz ◽  
Helmut Stach
Keyword(s):  
Catalytic Activity ◽  
Molecular Sieves ◽  
Silicon Content ◽  
Silica Content ◽  
Template Molecule ◽  
Toluene Disproportionation ◽  
Physico Chemical ◽  
Adsorbed Ammonia ◽  
Temperature Programmed ◽  
Si Content

Two series of SAPO-5 molecular sieves were synthesized: (i) Using tripropylamine as a template and varying the Si content in the gel, and (ii) varying the template molecule at constant silicon content in the gel. The products were characterized physico-chemically and tested in toluene disproportionation. It was found that the rising silica content in the synthesis gel has only little influence on the SiO2 incorporation into the SAPO. Investigation of the acid character revealed that the concentrations of the adsorbed ammonia molecules are nearly constant and independent of the total silicon content of the crystals. The catalytic activity showed no correlation either with the silicon content of the catalysts or with the acidity measured by temperature-programmed desorption of ammonia. It is concluded that the incorporated silicon exists not only in a monomeric form and that the TPD of ammonia reflects not only the strong Bronsted acidity. The SAPO-5 sample synthesized with triethylamine possessed the strongest acidity corresponding to the highest catalytic activity. It is supposed that in the presence of TEA molecules silicon replaces mainly P atoms in the AlPO4-5 framework.

The Properties of CrSiN Coatings of Different Si Content

2014 ◽  
Vol 687-691 ◽  
pp. 4323-4326 ◽  
Author(s):  
Xiang Min Xu ◽  
Hao Zhang ◽  
Fei Fei Luo ◽  
Zi Hao Zhou ◽  
Shu Wang Duo
Keyword(s):  
Mechanical Properties ◽  
Magnetron Sputtering ◽  
Amorphous Phase ◽  
Deposition Rate ◽  
Comparative Studies ◽  
Silicon Content ◽  
Amorphous Structure ◽  
Closed Field ◽  
Reactive Magnetron ◽  
Si Content

CrSiN coatings of different silicon content were deposited on 1Cr18Ni9Ti austenitic stainless by d.c. reactive magnetron sputtering in a closed field unbalanced system. Comparative studies on microstructure and mechanical properties between CrN and CrSiN coatings with various Si contents were carried out. The structure of the CrSiN coatings was found to change from crystalline to amorphous structure as the Si contents increased. Amorphous phase of Si3N4 compound was suggested to exist in the CrSiN coatings. The crystalline grain became smaller in CrSiN coatings. With the increasing Si content, the coating deposition rate slew down, while the hardness of coatings improved obviously and the best hardness was about 4200 HV0.01 when the Si content was 1.13%.

Structure and Optical Properties of Magnetron-Sputtered SiOx Layers with Silicon Nanoparticles

2010 ◽  
Vol 303-304 ◽  
pp. 7-19
Author(s):  
L. Khomenkova ◽  
N. Korsunska ◽  
T. Stara ◽  
Y. Goldstein ◽  
J. Jedrzejewski ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Silicon Content ◽  
Silicon Nanoparticles ◽  
Depth Distribution ◽  
Blue Shift ◽  
Nitrogen Atmosphere ◽  
Emission Characteristics ◽  
Particle Sizes ◽  
Nanocrystal Formation ◽  
Si Content

The properties of SiOx layer prepared by magnetron sputtering is studied by photoluminescence Auger and SIMS methods. The depth distribution of emission characteristics and chemical composition is obtained. It is shown that as-sputtered SiOx layers are non-emitted and characterized by homogeneous enough chemical composition. High-temperature annealing in nitrogen atmosphere stimulates not only the Si nanocrystal formation but also the redistribution of silicon and the appearance of Si depleted region near layer-substrate interface. The last process is found to be dependent on excess Si content. It is found that decrease of silicon content in the depth of annealed layers is followed by the decrease of particle sizes that is proved by the blue shift of photoluminescence maximum. The possible reasons of the appearance of Si depleted region are discussed.

Effects of Annealing Temperature and Si Content on Mechanical Properties of Cold Drawn Pearlitic Steel Wires

2007 ◽  
Vol 345-346 ◽  
pp. 65-68
Author(s):  
Dae Bum Park ◽  
Won Jong Nam
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Silicon Content ◽  
Annealing Temperature ◽  
Pearlitic Steel ◽  
Age Hardening ◽  
Solid Solution Hardening ◽  
Solution Hardening ◽  
Steel Wires ◽  
Si Content

The effects of annealing temperature and silicon content on mechanical properties on cold drawn pearlitic steel wires were investigated. Cold drawn steel wires, containing Si, 0.99 ~ 1.4%, were annealed at the temperature of 200 ~ 450°C with different annealing time. The variation of microstructural evolution with annealing temperature was not affected by silicon content. For steels containing high silicon content above 1.0%, the increase of silicon content did not cause the changes of peak temperature showing age hardening and age softening, except for the increase of tensile strength due to solid solution hardening.

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