Nukleonika最新文献_第4页

Studies on uranium recovery from a U-bearing Radoniów Dump 某含铀排土场Radoniów铀回收研究

IF 0.7 4区物理与天体物理

Nukleonika Pub Date : 2021-11-25 DOI: 10.2478/nuka-2021-0017

Katarzyna Kiegiel, O. Roubinek, D. Gajda, P. Kalbarczyk, Grażyna Zakrzewska-Kołtuniewicz, A. Chmielewski

引用次数: 0

Combination of methods of thermal and radiation treatment of sediments associated with PCBs – the Delor type 与多氯联苯有关的沉积物的热和辐射处理方法的组合- Delor类型

IF 0.7 4区物理与天体物理

Nukleonika Pub Date : 2021-11-25 DOI: 10.2478/nuka-2021-0030

M. Fülöp, A. Šagátová, I. Benkovský, K. Prokeš, Ľubica Foltínová

引用次数: 0

Effect of gamma irradiation on microbiological and nutritional properties of the freeze-dried berries γ辐照对冻干浆果微生物和营养特性的影响

IF 0.7 4区物理与天体物理

Nukleonika Pub Date : 2021-11-25 DOI: 10.2478/nuka-2021-0032

S. Mašić, Ivica Vujčić

{"title":"Effect of gamma irradiation on microbiological and nutritional properties of the freeze-dried berries","authors":"S. Mašić, Ivica Vujčić","doi":"10.2478/nuka-2021-0032","DOIUrl":"https://doi.org/10.2478/nuka-2021-0032","url":null,"abstract":"Abstract Lyophilization or freeze-drying is the technique of removing ice or other frozen solvents from a material through sublimation and the removal of bound water molecules through the process of desorption. Drying occurs in an absolute vacuum at temperatures from −40°C to −50°C. This technique is often used for the conservation of fruits, especially berries. During this process, the water changes from frozen to gaseous, with no thawing. Due to low temperatures and the high vacuum, most microorganisms are rendered inactive during the lyophilization process. However, if there is a necessity to destroy all microorganisms from treated food, subsequent irradiation with gamma rays is an appropriate method. This paper investigated the influence of different doses of gamma radiation on lyophilized berries’ microbiological characteristics. It was shown that the radiation dose of 7 kGy is sufficient to eliminate the total number of microorganisms (excluding molds) to the extent that the number falls below the permitted limit according t o the law on the microbiological safety of foodstuffs of the Republic of Serbia, and 5 kGy is enough for molds to be rendered inactive. It was also concluded that gamma irradiation does not affect the nutritional value of lyophilized berries.","PeriodicalId":19467,"journal":{"name":"Nukleonika","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2021-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48098215","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Organic pollutant removal from marine diesel engine off-gases under electron beam and hybrid electron beam and wet scrubbing process 电子束和混合电子束湿式洗涤法去除船用柴油机尾气中的有机污染物

IF 0.7 4区物理与天体物理

Nukleonika Pub Date : 2021-11-25 DOI: 10.2478/nuka-2021-0028

Yongxia Sun, A. Chmielewski, A. Pawelec, G. Mattausch, T. Torims

{"title":"Organic pollutant removal from marine diesel engine off-gases under electron beam and hybrid electron beam and wet scrubbing process","authors":"Yongxia Sun, A. Chmielewski, A. Pawelec, G. Mattausch, T. Torims","doi":"10.2478/nuka-2021-0028","DOIUrl":"https://doi.org/10.2478/nuka-2021-0028","url":null,"abstract":"Abstract The removal of organic pollutants from ship emission was studied using two processes namely electron beam (EB) and hybrid EB with wet scrubbing process. A mobile accelerator unit was used to treat 4915 Nm3/h of flue gas emitted from a tugboat in Riga Shipyard. A volume of 3 m3 seawater containing 36.8 mM of NaClO2 oxidant was used as a wet scrubber solution. Organic pollutants, mainly volatile organic pollutants (VOCs), were collected at three different sampling points, before and after irradiation vessels, and after wet-scrubber unit, respectively. They were collected with glass sampling bottles, tedlar bags, Coconut Shell Charcoal (CSC) sorbents and XAD-2 sorbents. CH3OH and CH3OH/CH2Cl2 (1:1) were used to extract VOCs from CSC and XAD-2 sorbents, respectively. Syringe filters were used to obtain the solid-free extraction solutions. They were concentrated using a micro-extractor under continuously blowing high-purity Ar. A gas chromatography–mass spectrometry (GC-MS) was used for analysis. The identified organic compounds were: aliphatic hydrocarbons (dodecane C12H26 to eicosane C20H42), aromatic hydrocarbon (toluene), esters (C3H7COOCH3, (C4H9OCO)2C6H4), nitro compounds (C3H5NO3, C4H7NO2) and acid (C7H15COOH). After 4.2 kGy EB irradiation, around 50–100% aliphatic hydrocarbons, 83% toluene and 7.5% (C4H9OCO)2C6H4 were removed from the off-gases, and after EB hybrid wet-scrubber process, most organic compounds including nitro compounds were removed. Only trace amount of toluene, hexadecane, octadecane and dibutyl phthalate were found to be present in the gas phase.","PeriodicalId":19467,"journal":{"name":"Nukleonika","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2021-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46346821","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Optimization of the loading pattern of the PWR core using genetic algorithms and multi-purpose fitness function 基于遗传算法和多目标适应度函数的压水堆堆芯加载方式优化

IF 0.7 4区物理与天体物理

Nukleonika Pub Date : 2021-11-25 DOI: 10.2478/nuka-2021-0022

W. Kubiński, P. Darnowski, Kamil Chęć

{"title":"Optimization of the loading pattern of the PWR core using genetic algorithms and multi-purpose fitness function","authors":"W. Kubiński, P. Darnowski, Kamil Chęć","doi":"10.2478/nuka-2021-0022","DOIUrl":"https://doi.org/10.2478/nuka-2021-0022","url":null,"abstract":"Abstract The study demonstrates an application of genetic algorithms (GAs) in the optimization of the first core loading pattern. The Massachusetts Institute of Technology (MIT) BEAVRS pressurized water reactor (PWR) model was applied with PARCS nodal-diffusion core simulator coupled with GA numerical tool to perform pattern selection. In principle, GAs have been successfully used in many nuclear engineering problems such as core geometry optimization and fuel configuration. In many cases, however, these analyses focused on optimizing only a single parameter, such as the effective neutron multiplication factor (keff), and often limited to the simplified core model. On the contrary, the GAs developed in this work are equipped with multiple-purpose fitness function (FF) and allow the optimization of more than one parameter at the same time, and these were applied to a realistic full-core problem. The main parameters of interest in this study were the total power peaking factor (PPF) and the length of the fuel cycle. The basic purpose of this study was to improve the economics by finding longer fuel cycle with more uniform power/flux distribution. Proper FFs were developed, tested, and implemented and their results were compared with the reference BEAVRS first fuel cycle. In the two analysed test scenarios, it was possible to extend the first fuel cycle while maintaining lower or similar PPF, in comparison with the BEAVRS core, but for the price of increased initial reactivity.","PeriodicalId":19467,"journal":{"name":"Nukleonika","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2021-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46397296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Numerical modelling of modular high-temperature gas-cooled reactors with thorium fuel 含钍燃料的模块化高温气冷堆数值模拟

IF 0.7 4区物理与天体物理

Nukleonika Pub Date : 2021-11-25 DOI: 10.2478/nuka-2021-0020

M. Oettingen, J. Cetnar

引用次数: 10

Decomposition of diclofenac in sewage from municipal wastewater treatment plant using ionizing radiation 利用电离辐射分解城市污水处理厂污水中的双氯芬酸

IF 0.7 4区物理与天体物理

Nukleonika Pub Date : 2021-11-25 DOI: 10.2478/nuka-2021-0029

A. Bojanowska-Czajka

引用次数: 0

Critical comparison of INAA and ICP-MS applied in the characterization of purity of TRISO fuel and substrates to its production INAA和ICP-MS在三iso燃料及其生产底物纯度鉴定中的关键性比较

IF 0.7 4区物理与天体物理

Nukleonika Pub Date : 2021-11-25 DOI: 10.2478/nuka-2021-0018

E. Chajduk, P. Kalbarczyk

引用次数: 1

Electron beam technology for biogas and biofertilizer generation at municipal resource recovery facilities 电子束技术在城市资源回收设施中产生沼气和生物肥料

IF 0.7 4区物理与天体物理

Nukleonika Pub Date : 2021-11-25 DOI: 10.2478/nuka-2021-0031

A. Chmielewski, Marcin Sudlitz, B. Han, S. Pillai

引用次数: 1

Application of genetic algorithms in optimization of SFR nuclear reactor design 遗传算法在SFR核反应堆优化设计中的应用

IF 0.7 4区物理与天体物理

Nukleonika Pub Date : 2021-11-25 DOI: 10.2478/nuka-2021-0021

Wojciech Żurkowski, P. Sawicki, W. Kubiński, P. Darnowski

{"title":"Application of genetic algorithms in optimization of SFR nuclear reactor design","authors":"Wojciech Żurkowski, P. Sawicki, W. Kubiński, P. Darnowski","doi":"10.2478/nuka-2021-0021","DOIUrl":"https://doi.org/10.2478/nuka-2021-0021","url":null,"abstract":"Abstract This work presents a demonstrational application of genetic algorithms (GAs) to solve sample optimization problems in the generation IV nuclear reactor core design. The new software was developed implementing novel GAs, and it was applied to show their capabilities by presenting an example solution of two selected problems to check whether GAs can be used successfully in reactor engineering as an optimization tool. The 3600 MWth oxide core, which was based on the OECD/NEA sodium-cooled fast reactor (SFR) benchmark, was used a reference design [1]. The first problem was the optimization of the fuel isotopic inventory in terms of minimizing the volume share of long-lived actinides, while maximizing the effective neutron multiplication factor. The second task was the optimization of the boron shield distribution around the reactor core to minimize the sodium void reactivity effect (SVRE). Neutron transport and fuel depletion simulations were performed using Monte Carlo neutron transport code SERPENT2. The simulation resulted in an optimized fuel mixture composition for the selected parameters, which demonstrates the functionality of the algorithm. The results show the efficiency and universality of GAs in multidimensional optimization problems in nuclear engineering.","PeriodicalId":19467,"journal":{"name":"Nukleonika","volume":null,"pages":null},"PeriodicalIF":0.7,"publicationDate":"2021-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47273065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2