[en] Highlights: • A sustainable and stable liquid redox process was proposed to recover electricity and sulfur from waste pollutant H₂S. • The fuel cell was employed into iron EDTA-based liquid redox sulfur recovery technique. • The optimal pH, which was turned out to be 9, maximally produced electricity as well as effectively captured H₂S. • Fuel cell provides an innovative way to enhance the stability of EDTA. - Abstract: In this study, an innovative iron EDTA-based H₂S capture technology was proposed. Just like currently available approaches, this system allows to capture H₂S and convert it into element sulfur. It does so, however, with net energy production and without absorbent degradation. The system, consisting of an absorber and a fuel cell units, absorbs gaseous H₂S and oxidize it to elemental sulfur in the absorber compartment, and in the fuel cell unit converts the reduced form of the absorbent [Fe(II)EDTA]²⁻ back to [Fe(III)EDTA]⁻, generating electricity. When solution pH was raised from 7 to 10, more gaseous H₂S was absorbed into [Fe(III)EDTA]⁻, resulting in increased production [Fe(II)EDTA]²⁻. This reduced form of the absorbent, which should be subsequently regenerated for continuous operation, serves as a fuel in a Fe(II)-based fuel cell. Fuel cell performance was also found to be strongly affected by solution pH, and the highest maximum power density of 0.832 mW cm⁻² was achieved at pH 9 and 60 °C. At this condition, more than 80% of [Fe(III)EDTA]⁻ was recovered from [Fe(II)EDTA]²⁻ in 2 h without any noticeable degradation of EDTA, amounted to the oxidation rate of 147 g Fe h^−1m−2 anode surface area. This study provides demonstration of many desirable aspects for field implementation, such as electricity generation, sulfur recovery and long-term stability of the absorbent

[en] In this study, data on the weight loss and thickness reduction of STS304 specimens, which are caused by temperature and voltage, were selected for commercial electro- decontamination process equipment, and a pilot scale electro-decontamination process was conducted to evaluate decontamination efficiency. From the results of this experiment, it was confirmed that the results are similar to the experimental results at the laboratory scale in relation to the voltage increase. The measurement revealed that the average thickness removal rate was 24 μm per 1 hour on the surface area of 1.5 m². Therefore, it is expected that it will exhibit excellent decontamination efficiency even in the process of commercial scale. Future research will be carried out to enhance decontamination efficiency about complex shaped segmentation by using arrangement of electrodes

[en] As Kori Unit 1 is going to shut down permanently in June 2017, the securing of decontamination technology related to waste reduction occurring in the decommissioning process of nuclear power plants is being discussed as an important issue. Electro-decontamination has a high decontamination factor and excellent decontamination effect on metals, which can be effectively used to primary system of nuclear power plants. This phosphoric acid electrolytic decontamination can be reused as a decontamination agent through the regeneration process as well as reducing waste. Oxalic acid dissociates into electrolytes and regulates the pH by supplying hydrogen ions. In addition, oxalic acid precipitates from divalent metal ions such as Fe²⁺, Ni²⁺ and radioactive species ⁶⁰Co²⁺, ⁵⁹ Fe²⁺ metal oxalate, reducing the concentration of metal ions in solution.

[en] The generated metal precipitates can be converted from oxalate to oxide through a calcination process and treated as a safe compound. In this study, the regenerable electro decontamination process was evaluated by the pilot scale equipment. As a result, most of the results were similar with lab scale tests. With this result, it can be conferred that the regenerable electro decontamination can remove nuclides in the base material and lower the radioactivity level. The liquid waste can be used for a longtime through the regeneration process and the solid waste can be easily treated by removing the chelate agent from the metal precipitates.

[en] Myocardial perfusion imaging using positron emission tomography (PET) has several advantages over single photon emission computed tomography (SPECT). The recent advances in SPECT technology have shown promise, but there is still a large need for PET in the clinical management of coronary artery disease (CAD). Especially, absolute quantification of myocardial blood flow (MBF) using PET is extremely important. In spite of considerable advances in the diagnosis of CAD, novel PET radiopharmaceuticals remain necessary for the diagnosis of CAD because clinical use of current cardiac radiotracers is limited by their physical characteristics, such as decay mode, emission energy, and half-life. Thus, the use of a radioisotope that has proper characteristics and a proper half-life to develop myocardial perfusion agents could overcome these limitations. In this review, the current state of cardiac PET and a general overview of novel 18F or 68Ga-labeled radiotracers, including their radiosynthesis, in vivo characterization, and evaluation, are provided. The future perspectives are discussed in terms of their potential usefulness based on new image analysis methods and hybrid imaging

[en] It is essential to develop chemical decontamination process for minimizing secondary waste along with increasing decon factor. HyBRID(Hydrazine Based Reductive metal Ion Decontamination) is chemical decontamination process using a reducing agent containing a metal catalyst without using organic acid. This study was carried out to demonstrate HyBRID decontamination and waste water precipitation process for the pilot scale. In this study, HyBRID chemical decontamination was demonstrated by using a pilot scale decontamination system. As result of the test, the oxide film was removed and most of the reagent and metal ions in the process water were precipitated by the precipitation step. It is expected that HyBRID chemical decontamination process can be applied to commercial decontamination process, if the precipitation step is improved

[en] The infrared thermography technology rather than traditional nondestructive methods has benefits with non-contact and non-destructive testings in measuring for the fault diagnosis of the rotating machine. In this work, condition monitoring measurements using this advantage of thermography were proposed. From this study, the novel approach for the damage detection of a rotating machine was conducted based on the spectrum analysis. As results, by adopting the ball bearing used in the rotating machine applied extensively, an spectrum analysis with thermal imaging experiment was performed. Also, as analysing the temperature characteristics obtained from the infrared thermography for in-situ rotating ball bearing under the lubrication condition, it was concluded that infrared thermography for condition monitoring in the rotating machine at real time could be utilized in many industrial fields

[en] Lipophilic cations including tetraphenyl phosphonium (TPP) salts penetrate the hydrophobic barriers of the plasma and mitochondrial membranes, resulting in accumulation in mitochondria in response to the negative inner transmembrane potentials. The development of radiolabeled phosphonium cations as a noninvasive imaging agent may serve as a new molecular 'voltage sensor' probe to investigate the role of mitochondria in the pathophysiology and diagnosis of cancer. We have synthesized a reference compound (4-fluorophenyl)triphenylphosphonium (TPP) and a labeled compound [¹⁸F]TPP via two step nucleophilic substitution of no-carrier-added [¹⁸F]fluoride with the precursor, 4-iodo phenyltrimethylammonium iodide, in the presence of Kryptofix-2.2.2 and K₂CO₃. The reference compound (4-fluorophenyl)triphenylphosphonium (TPP) was synthesized in 60% yield. The radiolabeled compound [¹⁸F]TPP was synthesized in 10 ∼ 15% yield. The radiochemical purity of the [¹⁸F]TPP was 95.57 ± 0.51% (n = 11). [¹⁸F]TPP was successfully synthesized that might have a potential to be utilized as a novel myocardial or cancer imaging agent for PET. However, it is required to improve the radiochemical yield to apply [¹⁸F]TPP in preclinical or clinical researches

[en] Lipophilic cations including phosphonium salts penetrate the hydrophobic barriers of the plasma and mitochondrial membranes and accumulate in mitochondria in response to the negative inner transmembrane potentials. The development of radiolabeled phosphonium cations as a noninvasive imaging agent may serve as a new molecular 'voltage sensor' probe to investigate the role of mitochondria in the pathophysiology and diagnosis of cancer. Besides, the tetraphenylphosphonium (TPP) salts has been known to be accumulated in cancer cells as well as in cardiomyocytes especially, [18F]labeled tetraphenylphosphonium derivativesare thought to have a potential to be utilized as a novel myocardial or cancer imaging agent for PET. We have synthesized a reference compound fluoroalkyl triphenylphosphonium (n=5, 6, 7, 8) and a labeled compound, [18F]fluoroalkyl triphenylphosphonium (n=5, 6, 7, 8), which via two step nucleophilic substitution of no-carrier-added F-18 fluoride with the precurso in the presence of Kryptofix-2.2.2 and K2CO3. The reference compound fluoroalkyl triphenylphosphonium (n=5, 6, 7, 8) were synthesized in 79∼82% yield and the labeled compound were synthesized in 20∼25% yield respectively. The tetraphenylphosphonium (TPP) salts exhibited accumulation in cancer as well as heart. Therefore, [18F] radiolabeled tetraphenylphosphonium derivatives are thought to have a potential being utilized as a novel PET molecular probe for imaging cancer and myocardium. Thus, the development of [18F] radiolabeled tetraphenylphosphonium derivatives as a noninvasive imaging agent may serve as a new molecular voltage sensor probe to investigate the role of mitochondria in the diagnosis and treatment of ischemic heart disease and cancer

[en] In this paper, the novel approach for the fault diagnosis of the bearing equipped with rotational mechanical facilities was studied. As research works, by applying the ball bearing used extensively in many industrial fields, experiments were conducted in order to propose the new prognostic method about the condition monitoring for the rotational bodies based on the condition analysis of infrared thermography. Also, by using the vibration spectrum analysis, the real time monitoring was performed. As results, it was confirmed that infrared thermography method could be adapted into monitor and diagnose the fault for bearing by evaluating quantitatively and qualitatively the temperature characteristics according to the condition of the ball bearing