MATTER: International Journal of Science and Technology <div id="focusAndScope"> <p><strong>ISSN 2454-5880</strong></p> </div> Global Research & Development Services Publishing en-US MATTER: International Journal of Science and Technology 2454-5880 <p><strong>Copyright of Published Articles</strong></p> <p>Author(s) retain the article copyright and publishing rights without any restrictions.</p> <p><a href=""><img src="" alt="Creative Commons License" /></a><br />All published work is licensed under a <a href="">Creative Commons Attribution-NonCommercial 4.0 International License</a>.</p> QUENCHING BEHAVIOR OF THE SOLUTION FOR THE PROBLEMS WITH SEQUENTIAL CONCENTRATED SOURCES <p><em>This article studies the diffusion problems with a concentrated source which is provided at a sequential time steps in 1 dimensional space. The problems are considered for both Gaussian and fractional diffusion operators. For the fractional diffusion case, Riemann-Liouville operator with fractional order is used to describe the model with diffusion rate slower than normal time scale, which is known as subdiffusive problems. Due to this subdiffusive property, the existence and nonexistence behavior of the solution will be studied. Since the forcing term will experience a concentrated source at a sequence of time steps, the frequency, the time difference and strength of the source may affect the growth rate of the solution. Criteria for these effects which may cause for the quenching behavior of the solution will be given. The existence of the solution is investigated. The monotone behavior in spatial will be given. The quenching behavior of the solution will be studied. The location of the quenching set will be discussed.</em></p> H T Liu Copyright (c) 2022 H T Liu 2022-11-15 2022-11-15 8 3 1 11 10.20319/mijst.2022.83.0111 INACTIVATION EFFECTS OF NEGATIVE PRESSURES BY A METAL BERTHELOT TECHNIQUE ON BACTERIA SOLUTIONS <p><em>Bacterial solutions are anticipated</em><em> to </em><em>be </em><em>inactivate</em><em>d</em> <em>under</em> <em>absolute liquid negative pressures </em><em>much lower in magnitude than positive </em><em>ones</em><em>. </em><em>T</em><em>he pressure</em><em>s, however, have been</em> <em>hard</em><em> to be </em><em>produced</em> <em>by </em><em>experiment</em><em>s</em> <em>because</em> <em>liquids form </em><em>cavit</em><em>ies</em> <em>easily </em><em>through heterogeneous nucleation. </em><em>To</em> <em>investigate</em><em> the </em><em>anticipation</em><em>, solutions including </em><em>two kinds of bacteria, namely B</em><em>acillus subtilis </em><em>and Escherichia coli, were exposed to</em><em> negative pressures repeatedly</em><em> by a </em><em>metal Berthelot tube</em><em> which was designed newly.</em> <em>Then, </em><em>numbers of colonies </em><em>in bacteria which were cultured </em><em>by </em><em>a paper strip method and </em><em>an agar dilute plate </em><em>one were</em><em> counted</em><em>. N</em><em>umbers of colonies which </em><em>underwent</em><em> negative pressures </em><em>were</em><em> less than those for non-treatment, and reduction rates </em><em>of colonies </em><em>increase</em><em>d</em><em> with numbers of repetition</em><em>.</em></p> Kazuki Hiro Momoko Imanishi Hiroshi Fukuoka Ayuko Itsuki Hiroki Kotake Copyright (c) 2022 Kazuki Hiro, Momoko Imanishi, Hiroshi Fukuoka, Ayuko Itsuki 2 2022-11-23 2022-11-23 8 3 12 26 10.20319/mijst.2022.83.1226