Development of Induction Melting System With Active Insulator for Radioactive Solid Waste

2003 ◽  
Author(s):  
Takeshi Matsumoto ◽  
Ichiro Kawaguchi ◽  
Ryo Chishiro ◽  
Motohiko Nishimura ◽  
Kazuki Kanai ◽  
...  
Keyword(s):  
Volume Ratio ◽  
High Volume ◽  
Full Scale ◽  
Reduction Ratio ◽  
Volume Reduction ◽  
Induction Melting ◽  
Metallic Materials ◽  
Medium Scale ◽  
Thermal Hydraulic Analysis ◽  
High Frequency Induction

The melting treatment is suitable for reducing the volume of the wastes because of the high volume reduction ratio (the volume reduction ratio is the initial volume to the volume after treatment). We have developed a new high-frequency induction melting system for the low-level radioactive miscellaneous solid wastes. The non-conductive ceramic canister and a heat loss compensator (Active insulator) were used in this new system. It is difficult to melt a large amount of the non-metallic materials with the canister. We solved this problem by using the active insulator, which was made of the conductive material. Melting performance confirmation tests were performed in the medium-scale melting system. Based on the result of the medium-scale melting test and multi-dimensional thermal-hydraulic analysis, the full-scale melting system was designed and constructed. We performed the melting tests using the full-scale melting system. the volume ratio of the non-metallic wastes at the re-solidification was more than 70%. Behavior of nuclides was also investigated with non-radioactive Co and Cs tracers. The residual ratio of Co and Cs were 97%, 58%, respectively.

Formation and capture of droplet with high volume ratio of cell to droplet

2021 ◽  
Author(s):  
Zhi Zhao ◽  
Zhen-Yu Xun ◽  
Liang-Liang Fan ◽  
Jiang Zhe ◽  
Liang Zhao
Keyword(s):  
Volume Ratio ◽  
High Volume

Ultrasound predictive criteria for short term benign thyroid nodular volume reduction after ultrasound guided radiofrequency ablation

QJM ◽  
2021 ◽  
Vol 114 (Supplement_1) ◽  
Author(s):  
Khaled Fikry Tawfik Shehab ◽  
Ahmed Mohamed Hussein ◽  
Rasha Tolba Khattab
Keyword(s):  
Thyroid Nodules ◽  
Reduction Ratio ◽  
Volume Reduction ◽  
Body Sensation ◽  
Significant Difference ◽  
Noticeable Improvement ◽  
Us Findings ◽  
Benign Thyroid Nodules ◽  
Benign Thyroid ◽  
Ultrasound Features

Abstract Purpose This study evaluates the outcome of patients complaining of compressive& cosmetic problems due to benign thyroid nodules after recieving RF ablation with correlation between some ultrasound features of the nodules and their shrinkage and volume reduction. Methods and material fifteen patients with benign thyroid nodules causing compressive symptoms (foreign body sensation,neck discomfort or pain) and cosmetic problems. Results A total of 15 patients were included with the age rangmg from 22-82 years old the mean was 52.73 years old (SD + 14.37).Among them 12 patients (800 0)were females and 3 patients(20%) were males. There was statistically significant difference between volume of nodules before the procedure with mean volume was 21.13±5.13 and I month after with mean volume I I .96±3.08 and 3 months after the procedure with mean volume 7.70±2.82 with noticeable improvement in nodules with peri and intranodular vascularity showing mean reduction ratio 69.88% after 3 months vs 59.93% and 64 12% of weak peripheral vascularity and intense intra-nodular vasculanty respectively as well as US structure with spongiform nodules showing mean reduction ratio 68.48% at 3 months vs 59.87% and 62.14% for solid &mixed nodules respectively.Mean symptoms and cosmetic score were significantly reduced. Conclusion: This study validated the efficacy and safety of RFA for treatment of benign thyroid nodules and showed correlation between shrinkage and some common US findings.

TurkStream Collapse Test Program

2018 ◽  
Author(s):  
Chris Timms ◽  
Doug Swanek ◽  
Duane DeGeer ◽  
Arjen Meijer ◽  
Ping Liu ◽  
...  
Keyword(s):  
Thermal Ageing ◽  
Full Scale ◽  
The Black Sea ◽  
Small Scale ◽  
Test Program ◽  
Line Pipe ◽  
Medium Scale ◽  
Collapse Resistance ◽  
Full Scale Tests ◽  
The Impact

The TurkStream pipeline project is designed to transport approximately 32 billion cubic meters of natural gas annually from Russia to Turkey under the Black Sea, with more than 85% of the deep-water route being deeper than 2000 m. The offshore section is intended to consist of two parallel lines, each approximately 900 km long. The preliminary stages of the front end engineering design (pre-FEED) phase was managed by INTECSEA. To support the analyses and design of the deepest portions, a full scale collapse test program was performed by C-FER Technologies (C-FER). This collapse test program, which included 62 full-scale collapse and pressure+bend tests, 54 medium-scale ring collapse tests, and hundreds of small-scale tests, was primarily aimed at measuring, quantifying and documenting the increase in pipe strength and collapse resistance resulting from the thermal induction heat treatment effect (thermal ageing) that arises during the pipe coating process. Two grades of 32-inch (813 mm) outside diameter (OD) line-pipe, SAWL450 and SAWL485 with wall thicknesses of 39.0 mm or 37.4 mm, respectively, were supplied from various mills for testing. The collapse test program objectives were as follows: • Determine the collapse resistance of line pipes originating from various pipe mills; • Determine the pressure+bend performance of line pipes originating from various pipe mills; • Measure the effect of thermal ageing on material and collapse testing results, including the impact of multiple thermal cycles; and • Evaluate the results of medium-scale ring collapse tests as compared to full-scale tests. This paper presents selected results of this work, along with some comparisons to predictive equations.

Thermal hydraulic analysis compared with tests of full-scale concrete casks

2008 ◽  
Vol 238 (5) ◽  
pp. 1213-1219 ◽  
Author(s):  
Masumi Wataru ◽  
Hirofumi Takeda ◽  
Koji Shirai ◽  
Toshiari Saegusa
Keyword(s):  
Full Scale ◽  
Hydraulic Analysis ◽  
Thermal Hydraulic Analysis

Analysis and Design of Multistage Electrostatically-Actuated Micro Vacuum Pumps

2002 ◽  
Author(s):  
Aaron Astle ◽  
Anthony Paige ◽  
Luis P. Bernal ◽  
Jennifer Munfakh ◽  
Hanseup Kim ◽  
...  
Keyword(s):  
Thermodynamic Model ◽  
Volume Ratio ◽  
High Volume ◽  
Fixed Number ◽  
Vacuum Pump ◽  
Pump Performance ◽  
Analysis And Design ◽  
Electrostatically Actuated ◽  
Flow Through ◽  
Low Volume

A new concept for a MEMS-fabricated micro vacuum pump is proposed. The pump is designed to operate in air and can be easily integrated into MEMS-fabricated micro fluidic systems. The pump consists of a series of pumping cavities with electrostatically actuated membranes interconnected by electrostatically actuated microvalves. A thermodynamic model of the micropump has been developed and used to determine the pump performance. It is shown that volume ratio plays an important role in the operation of the pump. For a fixed number of stages, at high volume ratio, pumping action is uniformly distributed among the stages. In contrast, at low volume ratio most of the pumping takes place in the latter stages of the pump. Detailed calculations of the flow through key components of the micropump are also reported. In particular the flow through a checkerboard microvalve and electrode perforations is discussed, and new correlations for the pressure loss in these components are proposed.

scholarly journals Ultrasound-Guided Microwave Ablation for Benign Thyroid Nodules: A Retrospective Analysis of Safety and Efficacy Factors

2021 ◽  
Author(s):  
Baoying Xia ◽  
Boyang Yu ◽  
Xiaofei Wang ◽  
Yu Ma ◽  
Feng Liu ◽  
...  
Keyword(s):  
Microwave Ablation ◽  
Thyroid Nodules ◽  
Thyroid Volume ◽  
Serum Levels ◽  
Reduction Ratio ◽  
Volume Reduction ◽  
Invasive Technique ◽  
Ultrasound Guided ◽  
Benign Thyroid Nodules ◽  
Benign Thyroid

Abstract ObjectiveMicrowave ablation (MWA) is a minimally invasive technique for the treatment of benign thyroid nodules. The purpose of this study was to evaluate the efficacy and safety of ultrasound-guided microwave ablation in the treatment of benign thyroid nodules, and to provide reference for future clinical work.MethodsThis study retrospectively analyzed the patients who received ultrasound-guided microwave ablation for benign thyroid nodules in our hospital from October 2018 to March 2020. A total of 214 patients were included in the study. We assessed thyroid volume changes (represented by volume reduction ratio VRR) , the serum levels of triiodide thyroid hormone (T3), thyroxine (T4) and thyrotropin (TSH) and complications after MWA treatment.ResultsThere were a total of 306 nodules in 214 patients, including 183 (85.51%) females and 31 (14.49%) males. The median diameter and volume of the nodule were 33mm and 8.01ml. The volume reduction ratio（VRR）at 1 month, 3 months, 6 months and 12 months were 40.79%, 60.37%, 74.59% and 85.60%, respectively.（P<0.05) In addition, initial nodular volume were the influencing factors of volume reduction ratio.ConclusionsUltrasound-guided MWA is effective and safe in the treatment of benign thyroid nodules. In addition, it has little damage to surrounding tissues and no effect on thyroid function. Especially for the initial small volume of nodules, treatment is better. Therefore, ultrasound-guided thyroid MWA can be used as one of the main clinical treatment methods for benign thyroid nodules.

scholarly journals Efficacy and Safety of Single-Session Radiofrequency Ablation in Treating Benign Thyroid Nodules: A Short-Term Prospective Cohort Study

2021 ◽  
Author(s):  
Bang Nguyen Van ◽  
Xuan Thi Nguyen ◽  
Hau Van Vy Nguyen ◽  
Thuy Hai Nguyen ◽  
Toan Dinh Nguyen ◽  
...  
Keyword(s):  
Success Rate ◽  
Thyroid Nodules ◽  
Reduction Ratio ◽  
Volume Reduction ◽  
Thyroid Function Tests ◽  
Short Term ◽  
Therapeutic Success ◽  
Benign Thyroid Nodules ◽  
Benign Thyroid

Abstract Objective:The aims of this study are to evaluate the safety and efficacy of RFA in the treatment of benign thyroid nodule(s) and to find independent factors related to the volume reduction rate of the nodule(s).Materials and methods: This short-term prospective study from a single medical center was conducted on 93 benign thyroid nodules in 93 patients treated with RFA. Two basic techniques were used: the trans-isthmic approach, moving-shot technique. Clinical and ultrasonography examinations were performed at 1; 3 months follow-up after the treatment session. Primary outcomes included volume reduction ratio (VRR) at 1 month and 3 months follow-ups; Secondary outcomes were therapeutic success rate and complications. Multiple linear regression analysis was used to determine independent factors associated with VRR. Results: A final sample of 78 patients with 78 nodules, given participant rate 83.8%, (included 60 solid nodules, 16 predominantly cystic nodules, and 2 thyroid cysts) was followed for 3 months. The mean volume reduction ratio was 41.47% and 64.72% after 1 month and 3 months follow-ups, respectively. The therapeutic success rate was 30.8% at 1 month and 84.6% at 3-month follow-ups. Symptom score and cosmetic score improved significantly. There was no change in thyroid function tests. Two minor complications (transient voice change) were found. The only internal component of nodules significantly related to the VRR during the 3 months follow-up (b = 23.00; 95%CI (7.59 - 38.45)).Conclusion: RFA was demonstrated as a safe and effective option for benign thyroid nodules treatment. It can be used as an alternative treatment with encouraging results.

scholarly journals Influence of Engineered Microorganisms on Vermicomposting of Pre-processed Vegetable Waste

2018 ◽  
Vol 7 (3.12) ◽  
pp. 784
Author(s):  
Senthilkumar Palaniappan ◽  
Murugappan Alagappan
Keyword(s):  
Growth Rate ◽  
High Volume ◽  
Volume Reduction ◽  
Optimum Level ◽  
Biomass Growth ◽  
Vegetable Waste ◽  
High Biomass ◽  
Land Area ◽  
Set Up ◽  
Substrate Depth

The low optimum level of vermi pile depth (10 cm-15 cm) warrants encroachment of large land area and consume more time in the vermicomposting process.  In engineered vermicomposting, the acceleration of digestion of high volume of waste was done by eliminating the pre-composting and introducing pre-processing the waste.  This process involves chopping, pulverizing, stocking, and drying the waste followed by injecting the engineered microorganisms (EM) at various depths in vermi bin during the vermicomposting process. Pre-processing and injection of EM enabled to increase the substrate depth by two-to-three-fold (30 cm).  Experimentation was conducted in five vermi bins with same quantity of worms (100 gms of E. fetida in each bin), with different stock loads of EM  (0.3ml, 0.4ml, 0.5ml, 0.6ml and 0.7ml) named as Bin 1, Bin 2, Bin 3, Bin 4 and Bin 5 respectively.  In parallel, a control (Bin C1) and conventional (Bin C2) vermi bin were also set up to compare the differences observed.  The outcome of the study clearly showed that the bin loaded with 0.7ml EM (Bin 5) stock achieved high volume reduction (70%). Moreover, the trail unit loaded with 0.5ml of EM stock (Bin 3) exhibited high biomass growth rate than its counter trail units.   

Use of hydrocyclone and flotation column for reducing the volume of contaminated dredged material

2006 ◽  
Vol 53 (7) ◽  
pp. 151-157 ◽  
Author(s):  
K.H. Park ◽  
J.H. Lee ◽  
B.H. Bae ◽  
Y.H. Kim ◽  
Y.K. Choung
Keyword(s):  
Heavy Metals ◽  
Integrated Treatment ◽  
Reduction Ratio ◽  
Volume Reduction ◽  
Wash Water ◽  
Column Flotation ◽  
Preliminary Treatment ◽  
Primary Concern ◽  
Flotation Column ◽  
Transmission Oil

As sediment contamination problems have recently been raised in Korea, the need for technologies to clean contaminants in sediments has increased. Although the recalcitrant organic matters and heavy metals in the contaminated sediments are of primary concern, large amounts of sediment makes the removal of the contaminants in them more difficult. In this study, the performance of hydrocyclone and flotation column was tested to reduce the volume of contaminated dredged materials (CDMs) prior to treating recalcitrant matters, such as various organic chemicals and heavy metals, in an integrated treatment system. When hydrocyclone was operated with 10% (w/v) solids concentration of the feed slurry, the total solids of upflow products were 4 to 7% (w/v) when the inlet pressure was changed from 1.0 to 2.0 kg/cm2. The volume reduction ratio of CDMs by hydrocyclone was approximately 90% (v/v). When the upflow products in hydrocyclone was then spiked with automobile transmission oil and fed to the flotation column to see the performance of the column flotation on the volume reduction and the TPH removal, 44% of the TPHs in feed were removed at the tails and the volume reduction ratio of CDMs by column flotation was 18% at 200 L/min of wash water. The flotation column could be proposed as a potential preliminary treatment process of CDMs prior to subsequent biological treatments.

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