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  • Open Access

    ARTICLE

    AN ITERTIVE DESIGN METHOD TO REDUCE THE OVERALL THERMAL RESISTANCE IN A CONJUGATE CONDUCTION-FREE CONVECTION CONFIGURATION

    Chadwick D. Sevart* , Theodore L. Bergman

    Frontiers in Heat and Mass Transfer, Vol.13, pp. 1-18, 2019, DOI:10.5098/hmt.13.18

    Abstract A design approach is proposed and demonstrated to identify desirable two-dimensional solid geometries, cooled by natural convection, that offer superior thermal performance in terms of reduced overall (conduction-convection) thermal resistance. The approach utilizes (i) heat transfer modeling in conjunction with (ii) various novel shape evolution rules. Predictions demonstrate the evolution of the solid shape and associated reduction of the overall thermal resistance. Parametric simulations reveal the dependence of the predicted solid shape on the evolution rule employed, the thermal conductivity of the solid material, and the strength of advection within the fluid. More >

  • Open Access

    ARTICLE

    THERMAL ANALYSIS OF HEAT TRANSFER ENHANCEMENT OF RIB HEAT SINK FOR CPU

    Ming Zhao* , Yang Tian

    Frontiers in Heat and Mass Transfer, Vol.13, pp. 1-10, 2019, DOI:10.5098/hmt.13.4

    Abstract The field synergy principle and thermal resistance analysis were carried out for the heat transfer enhancement of a chip heat sink. Thermal analysis of the heat dissipation capacity is applied for setting up the gallery on the rib, changing the fan ventilation diameter, and changing the rib height. The results show that the analysis of field synergy principle agrees well with that of the thermal analysis, and setting up a gallery on the rib can improve the heat capacity of the heat sink. Meanwhile, the results also show that decreasing diameter of the ventilation causes heat capacity dropping because the… More >

  • Open Access

    ARTICLE

    TRANSIENT MODELLING OF AN EV INVERTER HEAT SINK WITH PCM

    B. Orra,* , R. Singha, T. L. Phana , M. Mochizukib

    Frontiers in Heat and Mass Transfer, Vol.13, pp. 1-6, 2019, DOI:10.5098/hmt.13.1

    Abstract One of the problems with cooling an IGBT inverter chip is that its heat generation is not constant. These chips tend to produce heat in pulses which results in high peak chip temperatures. Transient modelling is required to determine the suitability of a heat sink and to ensure the max peak temperature is not exceeded. This paper demonstrates a method of transient thermal analysis using a thermal resistance / capacitor network. A sample heat sink was modelled and then experimentally tested to validate the model. A novel method of modelling phase change materials (PCM) using the thermal resistance / capacitor… More >

  • Open Access

    REVIEW

    In vitro Mutagenesis for the Improvement of Agave Genus

    Sugey Vásquez-Hernández, Joaquín Adolfo Montes-Molina*, Federico Antonio Gutiérrez-Miceli, Sheila Jazmín Reyes-Zambrano, Carlos Alberto Lecona-Guzmán*

    Phyton-International Journal of Experimental Botany, Vol.92, No.7, pp. 2065-2078, 2023, DOI:10.32604/phyton.2023.028784

    Abstract Biotechnological techniques provide a viable alternative to help improve and increase the production of plant species of agricultural and economic importance, which have been affected over the years by climate change, increasing their susceptibility to pests and/or diseases, generating losses in production as well as a decrease in their regenerative and genetic diversity. The application of biotechnological techniques such as in vitro mutagenesis offers a viable option for the generation of crops that are resistant to the different factors caused by abiotic and biotic stress. In vitro mutagenesis has been used in an efficient way to generate genetic changes in… More >

  • Open Access

    ARTICLE

    Intron Retention Fine-Tunes the Resistance of the Rice Mutant pls4 to Rice Sheath Blight (Rhizotonia solani AG I.1a)

    Shaochun Liu, Jiamin Hu, Haohua He, Junru Fu, Xu Jie, Dahu Zhou*, Haihui Fu*

    Phyton-International Journal of Experimental Botany, Vol.92, No.7, pp. 2035-2049, 2023, DOI:10.32604/phyton.2023.028296

    Abstract OsPLS4 encodes a β-ketoacyl carrier protein reductase (KAR). The role of OsPLS4 in rice sheath blight (Rhizoctonia solani) remains unclear. Our preliminary studies showed that premature leaf senescence mutants (pls4) were highly susceptive to sheath blight in the early stage of rice development. To explore the role of this gene in the development of rice sheath blight, the transcriptome profiles of the rice pls4 mutant and wild type were compared by RNA-seq. The results revealed 2,569 differentially expressed genes (DEGs). The down-regulated genes were significantly enriched in the defense response-related biological processes. These down-regulated genes included the chitinase genes and… More >

  • Open Access

    ARTICLE

    Mechanism of NURP1 in temozolomide resistance in hypoxia-treated glioma cells via the KDM3A/TFEB axis

    TAO LI#, XIN FU#, JIE WANG, WEI SHANG, XIAOTONG WANG, LINYUN ZHANG, JUN LI*

    Oncology Research, Vol.31, No.3, pp. 345-359, 2023, DOI:10.32604/or.2023.028724

    Abstract Temozolomide (TMZ) resistance is a major obstacle in glioma treatment. Nuclear protein-1 (NUPR1) is a regulator of glioma progression. This study investigated the mechanism of NUPR1 in TMZ resistance in hypoxia-treated glioma cells and its mechanism in modulating autophagy. We treated TMZ-resistant cells U251-TMZ and T98G-TMZ to normoxia or hypoxia and silenced NUPR1 in hypoxia-treated U251-TMZ and T98G-TMZ cells to assess cell viability, proliferation, apoptosis, LC3-II/LC3-I and p62 expressions, and autophagic flux under different concentrations of TMZ. We found that hypoxia upregulated NUPR1 expression and autophagy while NUPR1 silencing suppressed hypoxia-induced TMZ resistance and autophagy in glioma cells. We also… More > Graphic Abstract

    Mechanism of NURP1 in temozolomide resistance in hypoxia-treated glioma cells via the KDM3A/TFEB axis

  • Open Access

    ARTICLE

    Effects of Tsukamurella tyrosinosolvens P9 on growth, physiology and antioxdant enzyme of peanut under drought stress and after re-watering

    CHANGMEI LONG, TINGTING YANG, YUJIE HAN, LIZHEN HAN*

    BIOCELL, Vol.47, No.6, pp. 1417-1430, 2023, DOI:10.32604/biocell.2023.027485

    Abstract Background: The plant-growth-promoting rhizobacterium Tsukamurella tyrosinosolvens is a rare strain of actinomycete, in order to recognize and expand the ecological functions of rare actinomycetes. Methods: In this experiment, we studied the effect of Tsukamurella tyrosinosolvens P9 on the drought resistance of peanut by inoculating peanut seedlings in pots and measuring the growth and physiological indicators of peanut under drought stress and re-watering conditions. Results: The results showed that during drought stress, the relative water content of the soil and leaves, chlorophyll content, and stomatal length, width, and aperture were significantly decreased while the levels of malondialdehyde (MDA), H2O2 and stomatal… More >

  • Open Access

    ARTICLE

    Effect of High Temperature Curing on the Frost Resistance of Recycled Aggregate Concrete and the Physical Properties of Second-Generation Recycled Coarse Aggregate under Freeze-Thaw Cycles

    Xintong Chen, Pinghua Zhu*, Xiancui Yan, Lei Yang, Huayu Wang

    Journal of Renewable Materials, Vol.11, No.6, pp. 2953-2967, 2023, DOI:10.32604/jrm.2023.027140

    Abstract With the emphasis on environmental issues, the recycling of waste concrete, even recycled concrete, has become a hot spot in the field of architecture. But the repeated recycling of waste concrete used in harsh environments is still a complex problem. This paper discusses the durability and recyclability of recycled aggregate concrete (RAC) as a prefabricated material in the harsh environment, the effect of high-temperature curing (60°C, 80°C, and 100°C) on the frost resistance of RAC and physical properties of the second generation recycled coarse aggregate (RCA2) of RAC after 300 freeze-thaw cycles were studied. The frost resistance of RAC was… More >

  • Open Access

    ARTICLE

    HEAT TRANSFER PERFORMANCE THROUGH OBSTACLES TUBE BASED ON SC- CO2

    Ameer Abed Jaddoa* , Hussain Saad Abd

    Frontiers in Heat and Mass Transfer, Vol.20, pp. 1-12, 2023, DOI:10.5098/hmt.20.6

    Abstract In this work, the demeanour of heat transfer in a cooled upstanding turbulent flow condition of supercritical carbon dioxide SC- CO2 was investigated and analyzed. Several scenarios were adopted to handle the experimental data acquired by applying a perpendicular pipe with bending tape used in the examination model. The outcomes were presented using a typical method 'the dimensionless constitution'. Also, a modification was achieved to improve the relationship among the parameters for the processes of up and down flows. The achieved results will help address this research gap on turbulent perpendicular compound heat load based on cooling conditions. Finally, the… More >

  • Open Access

    ARTICLE

    Identification of Resistance to Pathogenesis Related Protein GmPR1L in Tobacco Botrytis cinerea Infection

    Yeyao Du1,#, Ye Zhang2,#, Yang Song1, Zhuo Zhang1, Sujie Fan1, Hanzhu Zhang1, Piwu Wang1,*

    Phyton-International Journal of Experimental Botany, Vol.92, No.6, pp. 1907-1920, 2023, DOI:10.32604/phyton.2023.027607

    Abstract Soybean (Glycine max (Linn.) Merr.) annual leguminous crop is cultivated all over the world. The occurrence of diseases has a great impact on the yield and quality of soybean. In this study, based on the RNA-seq of soybean variety M18, a complete CDS (Coding sequence) GmPR1L of the pathogenesis-related protein 1 family was obtained, which has the ability to resist fungal diseases. The overexpression vector and interference expression vector were transferred into tobacco NC89, and the resistance of transgenic tobacco (Nicotiana tabacum L.) to Botrytis cinerea infection was identified. The results show that: Compared with the control, the activities of… More >

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