Bogusław Bożek¹, Lucjan Sapa^1,*, Katarzyna Tkacz-Śmiech², Marek Danielewski², Janusz Rybak²

CMES-Computer Modeling in Engineering & Sciences, Vol.130, No.2, pp. 777-803, 2022, DOI:10.32604/cmes.2022.017729

Abstract Low-temperature nitriding of steel or iron can produce an expanded austenite phase, which is a solid solution of a large amount of nitrogen dissolved interstitially in fcc lattice. It is characteristic that the nitogen depth profiles in expanded austenite exhibit plateau-type shapes. Such behavior cannot be considered with a standard analytic solution for diffusion in a semi-infinite solid and a new approach is necessary. We formulate a model of interdiffusion in viscoelastic solid (Maxwell model) during the nitriding process. It combines the mass conservation and Vegard’s rule with the Darken bi-velocity method. The model is formulated in any dimension, i.e.,… More >

Abdulkhaliq Alshoaibi^*

Phyton-International Journal of Experimental Botany, Vol.91, No.1, pp. 45-55, 2022, DOI:10.32604/phyton.2022.016434

Abstract Pearl millet (Pennisetum spicatum (L.) Körn.) and maize (Zea mays L.) are C₄ grass species grown for feeding humans and animals in Almadinah Almunawwarah, which is in the western part of Saudi Arabia. During the winter, the mean temperature, which drops to 14°C, represents a major problem for the growth of these species in this region. Therefore, the objectives of this research were to investigate the growth response and the photosynthetic performance of P. spicatum and Z. mays under a low temperature stress. The treatments involved daytime and nighttime temperatures of 14/12°C (low temperature) and 24/22°C (optimum temperature). The results… More >

Nugroho Agung Pambudi^1,*, Santiko Wibowo¹, Ranto¹, Lip Huat Saw²

Energy Engineering, Vol.118, No.5, pp. 1565-1576, 2021, DOI:10.32604/EE.2021.016642

Abstract Organic Rankine Cycle (ORC) is one of the solutions to utilize a low temperature geothermal fluid for power generation. The ORC system can be placed at the exit of the separator to extract energy from brine. Furthermore, one of the main components of the system and very important is the pump. Therefore, in this research, the pump rotation is examined to investigate the effect on power output and energy efficiency for low temperature geothermal fluid. The rotation is determined by using an inverter with the following frequencies: 7.5, 10, 12.5, 15 and 17.5 Hz, respectively. R-134 working fluid is employed… More >

Feiyang Li, Jianfeng Pan^*, Chenxin Zhang, Evans K. Quaye, Xia Shao

Energy Engineering, Vol.118, No.4, pp. 1135-1154, 2021, DOI:10.32604/EE.2021.014366

Abstract In order to obtain the combustion characteristics of the CH₄/Air premixed flame under the action of the wall interaction, a study on the impact of the jet flame on the wall at different separation distances was carried out. The separation distance from the burner outlet to the lower surface of the wall is changed and the flame structure is obtained through experiments. The temperature, velocity and reaction rate are obtained through numerical simulation, and the law of flame characteristics change is obtained through analysis. The results show that as the separation distance increases, the premixing cone inside the flame gradually… More >

Md. Parvez Anwar^1,*, Md. Ariful Islam Khalid¹, A. K. M. Mominul Islam¹, Sabina Yeasmin¹, Sharif Ahmed², Adel Hadifa³, Ismail A. Ismail⁴, Akbar Hossain⁵, Ayman EL Sabagh^6,*

Phyton-International Journal of Experimental Botany, Vol.90, No.5, pp. 1491-1506, 2021, DOI:10.32604/phyton.2021.015822

Abstract Seed priming has proved to be an effective pre-germination seed invigoration technique for different crops to improve seed and seedling performance under different abiotic stresses. In Bangladesh, winter rice is very often exposed to cold waves just after sowing in the nursery bed resulting in poor seed germination and seedling emergence, yellowish and thin seedlings production, and a very low survival rate. Seed priming may mitigate the cold stress during seed germination and seedling emergence and helps in the quality seedling production of winter rice. To evaluate the efficacy of different seed priming techniques in increasing seedling emergence, growth, vigor… More >

Xing Li^1,3, Yugo Osaka^2,*, Hongyu Huang¹, Takuya Tsujiguchi², Akio Kodama²

Journal of Renewable Materials, Vol.9, No.9, pp. 1541-1553, 2021, DOI:10.32604/jrm.2021.015514

Abstract Sulfur dioxide (SO₂) emissions from diesel exhaust pose a serious threat to the environment and human health. Thus, desulfurization technology and the performance of desulfurization materials must be improved. In this study, MnO₂ was modified with various alkali metal ions using the impregnation method to enhance its SO₂ capture performance. The composites were characterized intensively by scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction spectroscopy, and Brunauer-Emmett-Teller theory. The SO₂ capture performance of these composites were measured via thermogravimetry, and the effect of doping with alkali metal ions on the SO₂ capture performance of MnO₂ was investigated. Results showed that… More >

Jun Li^1,2,3, Tao Zeng^1,2,3,*, Noriyuki Kobayashi⁴, Rongjun Wu⁴, Haotai Xu⁴, Lisheng Deng^1,2,3, Zhaohong He^1,2,3, Hongyu Huang^1,2,3,*

Journal of Renewable Materials, Vol.9, No.9, pp. 1621-2630, 2021, DOI:10.32604/jrm.2021.015231

Abstract In order to apply lithium hydroxide (LiOH) as a low temperature chemical heat storage material, the carbonation reaction of LiOH and the prevention method are focused in this research. The carbonation of raw LiOH at storage and hydration condition is experimentally investigated. The results show that the carbonation reaction of LiOH with carbon dioxide (CO₂) is confirmed during the hydration reaction. The carbonation of LiOH can be easily carried out with CO₂ at room temperature and humidity. LiOH can be carbonated at a humidity range of 10% to 20%, a normal humidity region that air can easily be reached. Furthermore,… More >

Kai Sheng¹, Saichao Wei¹, Jun Mei^1,2,3,4,*, Jing Xie^1,2,3,4,*

Phyton-International Journal of Experimental Botany, Vol.90, No.1, pp. 291-305, 2021, DOI:10.32604/phyton.2020.012985

Abstract Low-temperature storage is extensively used to optimize the postharvest life of various fresh fruits. However, red pitahaya (Hylocereus polyrhizus) fruits are sensitive to chilling injury (CI), which leads to the limitation of low-temperature storage. In this study, red pitahaya fruits were stored at 2, 4, 6, 8, and 10°C, respectively, for 27 days to determine the appropriate storage temperature. During the storage of red pitahaya fruits, storage at 8°C was more effective in suppressing decay and maintaining quality than other low temperatures. Low-temperature (2, 4, and 6°C) storage decreased weight loss (WL) and maintained higher content of titratable acidity (TA),… More >

Shuaishuai Zhu¹, Zhigang Pan^1,2, Yaqiu Tao^1,2,*, Yue Chen^1,2

Journal of Renewable Materials, Vol.8, No.8, pp. 939-946, 2020, DOI:10.32604/jrm.2020.011197

Abstract Hydrogen is recognized as a promising energy scours in the close future. Online hydrogen preparation from formic acid under mild reaction conditions causes extensive interests. Mo₂C and metal (Fe, Ni, Co, K) doped Mo₂C on granular activated carbon (GAC) were prepared and used as heterogeneous catalysts for H₂ generation from formic acid on a fixed bed reactor at 100–250°C. The formic acid conversions on doped Mo₂C-Me/GAC are clearly improved, especially at lower reaction temperatures. Co doping presents outstanding effect on H₂ selectivity and conversion rate compared to Ni and Fe. A 56.3% formic acid conversion was reached on Mo₂C-Co/GAC at… More >

Yundong Han¹, Dawei Chen¹, Shaoqing Liu¹, Gang Xu²

FDMP-Fluid Dynamics & Materials Processing, Vol.16, No.1, pp. 1-19, 2020, DOI:10.32604/fdmp.2020.06525

Abstract A series of tests have been conducted using a Cryogenic Wind Tunnel to study the effect of Reynolds number (Re) on the aerodynamic force and surface pressure experienced by a high speed train. The test Reynolds number has been varied from 1 million to 10 million, which is the highest Reynolds number a wind tunnel has ever achieved for a train test. According to our results, the drag coefficient of the leading car decreases with higher Reynolds number for yaw angles up to 30º. The drag force coefficient drops about 0.06 when Re is raised from 1 million to 10… More >