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Investment Decisions in the Energy Industry: The Role of Industrial Competition and Size
BACHA SIMOES, Emel Korea Distribution Science Association 2022 The Journal of Asian Finance, Economics and Busine Vol.9 No.9
Investment decisions are one of the most fundamental issues in financial management. This study aims to determine the factors that affect investment decisions in the energy industry and to contribute to the companies in this industry to develop strategic policies. The System GMM analyzes were carried out using the data of companies registered on the stock exchange for the period 2000-2015. The findings showed that industrial competition and firm size were important factors influencing the investment decisions of firms in the energy industry. The findings indicated a nonlinear relationship between industrial competition and the rate of investment in the energy sector. Depending on the firm's size, the effect of industrial competitiveness on investment varies. Smaller businesses are more impacted by the level of competition than larger ones. The investment rate decreases depending on the increase in cash holding level and firm risk. When the subgroups in the energy industry are examined, it is determined that they reveal some differences in terms of financial structure. A higher investment rate results from a higher retained earnings ratio. The investment rate of firms falls as a company's risk level and sales revenue variability increase.
MEER BACHA,주한규 한국원자력학회 2015 Nuclear Engineering and Technology Vol.47 No.7
The effective cross sections (XSs) in the direct whole core calculation code nTRACER are evaluated by the equivalence theory-based resonance-integral-table method using the WIMS-based library as an alternative to the subgroup method. The background XSs, as well as the Dancoff correction factors, were evaluated by the enhanced neutron-current method. A method, with pointwise microscopic XSs on a union-lethargy grid, was used for the generation of resonance-interference factors (RIFs) for mixed resonant absorbers. This method was modified by the intermediate-resonance approximation by replacing the potential XSs for the non-absorbing moderator nuclides with the background XSs and neglecting the resonance-elastic scattering. The resonance-escape probability was implemented to incorporate the energy self-shielding effect in the spectrum. The XSs were improved using the proposed method as compared to the narrow resonance infinite massbased method. The RIFs were improved by 1% in 235U, 7% in 239Pu, and >2% in 240Pu. To account for thermal feedback, a new feature was incorporated with the interpolation of pre-generated RIFs at the multigroup level and the results compared with the conventional resonance-interference model. This method provided adequate results in terms of XSs and k-eff. The results were verified first by the comparison of RIFs with the exact RIFs, and then comparing the XSs with the McCARD calculations for the homogeneous configurations, with burned fuel containing a mixture of resonant nuclides at different burnups and temperatures. The RIFs and XSs for the mixture showed good agreement, which verified the accuracy of the RIF evaluation using the proposed method. The method was then verified by comparing the XSs for the virtual environment for reactor applicationbenchmark pin-cell problem, as well as the heterogeneous pin cell containing burned fuel with McCARD. The method works well for homogeneous, as well as heterogeneous configurations.
Djoudi Abdelhak,Bacha Seddik,Iman-Eini Hossein,Rekioua Djamila 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.2
Grid integration of DFIG based-WECS/HPES has gained special attention in recent codes, especially under voltage disturbances. The main object of this requirement is to ameliorate the grid stability from the frequency point of view and increase the integration ratio of renewable energy conversion systems like WECS and HPES. The availability of such grid requirements depends heavily on the viability of the grid synchronization procedure of DFIG, which has not been thoroughly investigated under weak-grid conditions. It also depends on withstanding capacity of DFIG against over-voltages or so-called HVRT capability. In this regard, the present paper introduces a smooth and sensor-less grid synchronization strategy of DFIG under disturbed grid voltage to ensure HVRT capability. The feasibility of the proposed method is proved analytically and assessed via experimental and simulation results.
Digital Soil Mapping by Hyperspectral Imagery for Environmental Modelling in Mediterranean Regions
Lagacherie, P.,Gomez, C.,Bacha, S.,Ben Mechlia, M.,Baret, F.,Blanca, Y.,Coulouma,Derouiche, M.G.,Follain, S.,Hamrouni, H.,Jacob, F.,Le Bissonnais, Y.,Le Martret, H.,Masmoudi, M.M.,McBratney, A.B.,Mina 한국토양비료학회 2009 한국토양비료학회 학술발표회 초록집 Vol.2009 No.10
김준영,Hala Tfayli,Fida Bacha,Silva Arslanian 대한비만학회 2021 The Korean journal of obesity Vol.30 No.2
Background: The oral glucose tolerance test (OGTT)-glucose response curves (GRCs; incessant increase, monophasic, and biphasic) reflect insulin sensitivity and β-cell function, being worse in the former and superior in the latter. Here, we examined if the OGTT-GRC pattern is worse in obese antibody (glutamic acid decarboxylase 65-kDa [GAD65] and insulinoma-associated protein-2 [IA-2])-positive (Ab+) vs. –negative (Ab–) youth clinically diagnosed with type 2 diabetes (CDX-T2D). Methods: Forty-seven obese youth, 15 Ab+ and 32 Ab–, were divided into three OGTT-GRC groups: incessant increase, monophasic, and biphasic. The prevalence of OGTT-GRC, clamp-measured insulin sensitivity, and β-cell function was compared. Results: Incessant increase OGTT-GRC is the most frequent curve type and is three-fold higher in Ab+ vs. Ab– youth CDX-T2D. In Ab+ youth, there was up to 40% lower second-phase insulin secretion in the incessant increase group vs. the other two groups combined (monophasic and biphasic). In Ab– youth, while first- and second-phase insulin secretion was significantly lower in the incessant increase vs. the other two groups combined, overall β-cell function was less impaired than in Ab+ youth. In neither Ab– or Ab+ youth was OGTT-GRC related to hepatic or peripheral insulin sensitivity. Conclusion: Severe insulin deficiency, a characteristic of type 1 diabetes, seems to be related to higher prevalence of incessant increase in Ab+ vs. Ab– obese youth.
Ines Hammami,Bassem Jaouadi,Abir Ben Bacha,Ahmed Rebai,Samir Bejar,Xavier Nesme,Ali Rhouma 한국생물공학회 2012 Biotechnology and Bioprocess Engineering Vol.17 No.1
Bacillus subtilis strain 14B was used to produce a novel antimicrobial peptide (bacteriocin) called Bac 14B. Pure bacteriocin was obtained after heat and acidic treatments (80°C and pH 4), precipitation by ammonium sulfate, and chromatography on Sephadex G-50 and Mono Q Sepharose columns. Based on MALDI-TOF mass spectrometry analysis, purified Bac 14B is a monomer protein with a molecular mass of 20110.13 Da. N-terminal sequencing allowed for the straightforward identification of its first 12 residues, which were of a pure bacteriocin. It also revealed that this bacteriocin contained a unique sequence, namely M-L-K-A-N-L-Q-N-P-L-N-A, suggesting the identification of a novel compound. Bac 14B was stable for 1 h at temperatures up to 80°C and pH of 4 ~ 8. It also proved sensitive to various proteases, which demonstrated its protein nature. Bac 14B displayed a bacteriolytical mode of action and a broad range of inhibitory spectra toward Gram-positive and -negative pathogens. Interestingly,based on conventional agronomic seed vigor parameters,the application of Bac 14B (500 activity units/mL)to various crops revealed that this bacteriocin was a potent exogenous enhancer of growth that stimulated the seedling vigor of tomatoes and muskmelons. Compared to those of the control, the germination percentage, shoot weight,shoot height, and root length were all significantly enhanced in Bac 14B-treated plant seeds. Bac 14B also exhibited effective disinfectant properties against a wide range of seedborne diseases and significant effects on the control of damping off diseases, particularly at the pregermination stage. It also proved to be effective against root rot diseases caused by Alternaria solani and other bacterial seedborne pathogens such as wilt diseases. The findings indicate that Bac 14B is the first B. subtilisproduced bacteriocin ever reported to exhibit such promising biological properties. Bacillus subtilis strain 14B was used to produce a novel antimicrobial peptide (bacteriocin) called Bac 14B. Pure bacteriocin was obtained after heat and acidic treatments (80°C and pH 4), precipitation by ammonium sulfate, and chromatography on Sephadex G-50 and Mono Q Sepharose columns. Based on MALDI-TOF mass spectrometry analysis, purified Bac 14B is a monomer protein with a molecular mass of 20110.13 Da. N-terminal sequencing allowed for the straightforward identification of its first 12 residues, which were of a pure bacteriocin. It also revealed that this bacteriocin contained a unique sequence, namely M-L-K-A-N-L-Q-N-P-L-N-A, suggesting the identification of a novel compound. Bac 14B was stable for 1 h at temperatures up to 80°C and pH of 4 ~ 8. It also proved sensitive to various proteases, which demonstrated its protein nature. Bac 14B displayed a bacteriolytical mode of action and a broad range of inhibitory spectra toward Gram-positive and -negative pathogens. Interestingly,based on conventional agronomic seed vigor parameters,the application of Bac 14B (500 activity units/mL)to various crops revealed that this bacteriocin was a potent exogenous enhancer of growth that stimulated the seedling vigor of tomatoes and muskmelons. Compared to those of the control, the germination percentage, shoot weight,shoot height, and root length were all significantly enhanced in Bac 14B-treated plant seeds. Bac 14B also exhibited effective disinfectant properties against a wide range of seedborne diseases and significant effects on the control of damping off diseases, particularly at the pregermination stage. It also proved to be effective against root rot diseases caused by Alternaria solani and other bacterial seedborne pathogens such as wilt diseases. The findings indicate that Bac 14B is the first B. subtilisproduced bacteriocin ever reported to exhibit such promising biological properties.