Abstract
Abstract. In a postulated severe accidental condition of sodium-cooled fast reactor (SFR), eutectic melting between boron carbide (B4C) as control rod element and stainless steel (SS) as control rod cladding or related structure may take place. Thus, kinetic behavior of B4C-SS eutectic melting is one of the important phenomena to be …
Abstract
Abstract. The eutectic reaction between boron carbide (B4C) and stainless steel (SS) is one of the most important phenomena when considering the core disruptive accident (CDA) in a sodium-cooled fast reactor (SFR). Thus, in order to perform the safety assessment of SFR under postulated severe accidental condition reasonably, the kinetic …
Ignition and combustion characteristics of boron …
In contrast, by increase of oxygen concentration, the combustion time of boron agglomerates first increases from 183 ms to 242 ms and then decreases to 84 ms. The reason is the effective role of ejection phenomenon in the combustion process for the oxygen concentrations greater than 40%.
Boron recovery from salt lake brine, seawater, and …
The extraction of boron from the brine of boron concentration 5.43 g/L was carried out in a five-stage extraction process with 30% 2-ethyl-1,3-hexanediol at pH 2.0 …
Fabrication, characteristics, and applications of boron nitride …
Boron nitride (BN) is a novel nanoparticle with unique dimensions that can improve photocatalyst performance. ... Exfoliation process. ... Multiple aspects influence the polymeric reinforcement: (i) nature of the matrix; (ii) concentration nature of nanofillers; (iii) average particles size, orientation, and distribution [94].
Solved Problem #3 In the fabrication of a p-type | Chegg
The boron concentration within the solid silicon determines semiconducting properties of the material. A physical vapor deposition process keeps the concentration of elemental boron at the surface of the wafer equal to 5.0 x 1020 atoms boron/cm' silicon. In the manufacture of a transistor, it is desired to produce a thin film of silicon doped ...
Transient flameout process of boron-magnesium
In this study, boron–magnesium agglomerates with varying mass ratios were prepared by drying a micron-sized boron–magnesium mixed suspension, and the combustion process of these agglomerates under different oxygen-rich concentrations were investigated using a laser ignition system.
Comparison analysis of different technologies for the …
Thus, standard permissible value of boron concentration in drinking water has been fixed up to 2.4 mg L −1 and 1 mg L −1 by WHO and European Union (EU) [18]. …
Epitaxial Growth of SiGe Thin Films | SpringerLink
Moderate boron doping concentration of 1 × 10 20 atoms/cm 3 to 3 × 10 20 atoms/cm 3. The boron doping concentration in in situ doped epitaxial SiGe films can be estimated by XRD technique. This is beneficial for on-line monitoring of SiGe epitaxy process. (5) Suitable Ge content should be between 27 and 35%.
On the equilibrium concentration of boron-oxygen defects …
Abstract. We determine the equilibrium concentration of the BO defect in boron-doped Czochralski-grown silicon after prolonged (up to 150 h) annealing at relatively low temperatures between 200 ...
Study on Eutectic Melting Behavior of Control Rod Materials …
The eutectic reaction between boron carbide (B 4 C) and stainless steel (SS) is one of the most important phenomena when considering the core disruptive accident (CDA) in a sodium-cooled fast reactor (SFR). Thus, in order to perform the safety assessment of SFR under postulated severe accidental condition reasonably, the kinetic …
Abstract
Abstract. One of the key issues in a core disruptive accident (CDA) evaluation in sodium-cooled fast reactors is eutectic reactions between boron carbide (B4C) and stainless steel (SS) as well as its relocation. Such behaviors have never been simulated in CDA numerical analyses in the past, therefore it is necessary to develop a …
Boron Removal by Membrane Distillation: A …
Those concentrations of boron are selected on the basis of the concentration of boron in the permeate side of the single-pass reverse osmosis (RO) …
PROBLEM SET #8 SiO 60nm 0
A boron diffusion into a 1-ohm-cm n-type wafer results in a Gaussian profile with a surface concentration of 5×1018 cm-3 and a junction depth of 4µm. (a) How long did the diffusion take if the diffusion temperature was 1100°C. Ans: The background concentration of a 1-ohm-cm wafer is 𝑁𝐵=4.5×1015𝑐−3 [From textbook figure 4.8]
Sustainable treatment of boron industry wastewater with …
The boron concentrations at pH 9.0 were reduced to 1159, 1016 and 980 mg/L at 5, 10 and 20 g/L Al(OH) 3, respectively. ... In boric acid manufacturing, the first step of the process is boron leaching from boron-containing minerals with sulfuric acid. Therefore, no further purification is required since the recovered boron stream is …
Methods for boron removal from aqueous solutions …
The concentration of boron in fresh water is usually from less than 0.01 mg/L to 1.5 mg/L and increases significantly in areas where soils are boron enriched — …
Operating Cost and Treatment of Boron from Aqueous …
optimization on boron removal in low concentration by elec-trocoagulation process, especially electrode optimization which causes that makes difference on results and also lack of oper-ating cost calculation. This study aims to investigate removal of boron from aqueous solution by electrocoagulation process at concentrations of less than 50 …
Treatment of boron-containing optoelectronic wastewater …
The chemical precipitation process has been employed to treat high concentration boron solutions. Nevertheless, it may suffer from long operating time and high reaction temperature, and produce a ...
Study on Eutectic Melting Behavior of Control Rod Materials …
Abstract. In a core disruptive accident scenario, boron carbide, which is used as control rod material, may melt below the melting temperature of stainless steel due to the eutectic reaction with it. Produced eutectic mixture is assumed to relocate widely in the degraded core, and this behavior plays an important role to reduce the neutronic …
Properties of boron-rich layer formed by boron diffusion in …
The peak boron concentration in the non-etched sample was over 10 23 atoms/cm 3, which was much higher than any other reported boron concentration in BRL [8], [13]. This seems to imply that the peak concentration of BRL is process dependent. The depth of the junction was about 400 nm in non-etched sample. The junction depth …
[PDF] High-concentration boron doping of graphene …
B-doped graphene nanoplatelets prepared at 1000 °C show a maximum boron concentration of 6.04 ± 1.44 at %, which is the highest value among B-doped graphenes prepared using various methods. With well-mixed GO and g-B2O3 as the dopant, highly uniform doping is achieved for potentially gram-scale production.
Boron removal from saline water: A comprehensive review
The concentration of boron in the earth's crust varies from 1 to 500 ... Blahusiak and Schlosser [94] performed a simulation and optimisation of the AMF process for boron removal from RO permeate based on experimental data. It was found that diafiltration, using permeate of submerged microfiltration, is a critical factor affecting …
Boron in seawater and methods for its separation — A …
The change in boron concentration in permeate during 24 h of operation is shown in Fig. 9 (the tests were repeated twice and the results of each tests were given in Fig. 9). It can be noted that boron concentrations reached zero level in the first hour of process and kept constant to the end of the test. Download : Download full-size image; …
Sustainable treatment of boron industry wastewater with
The adsorption of boron on kaolinite in either medium showed similar dependence on pH and initial boron concentrations. Boron adsorption at higher pHs was noticeably higher in Ca(C104)2 medium as ...
Development of a Real-Time Boron Concentration …
Plasma doping (PLAD) technology is widely used in the semiconductor industry. One of the problems associated with PLAD is precise dosage control and monitoring during the doping process. Excessive boron doping into the n-type poly gate will affect the p-MOSFET threshold voltage. In this study, we develop a novel method for …
Characterization deep boron diffused p
In recent years the boron impurity-based dissolved wafer process has been repeatedly demonstrated as a powerful tool for forming single crystal Si microstructures. However, there is very little report on detailed characterization of the deep boron diffused silicon layer. This paper presents the optimization of deep boron diffused p++ silicon …
Investigation on boron diffusion effects in buried oxide of Si
In this paper, SOI wafers with boron implanting are used to investigate the impact of fabrication process on boron diffusion and gettering effect of Si NCs for boron. ... The boron concentration between 40 and 80 nm away from BOX/substrate interface has a remarkable increase, while the boron concentration peaks also shift to the right. ...
Desalination Post-treatment: Boron Removal Process
Therefore, a specific Boron Removal Process is required to achieve the 0.5 mg/L required by the WHO. How can Boron removed be from desalinated water? Depending on the water salinity, boron concentration and temperature, two main processes are used to produce drinking water below 0.5 mg/L of Boron: Process A 2-pass SWRO:
Boron Concentration
Boron dilution is the process where a local decrease in boron concentration in primary system occurs. Deboration is the process where a net loss of boron from primary …
Recent advances in boron removal in aqueous …
At pH 4 and temperature of 25 °C, ZIF-67 exhibited a high boron adsorption capacity of 579.80 mg.g −1 at the initial boron concentration of 5000 mg.L −1. …
