MATTER: International Journal of Science and Technology 2023-01-04T04:21:07+00:00 Editor, MATTER: International Journal of Science & Technology Open Journal Systems <div id="focusAndScope"> <p><strong>ISSN 2454-5880</strong></p> </div> QUENCHING BEHAVIOR OF THE SOLUTION FOR THE PROBLEMS WITH SEQUENTIAL CONCENTRATED SOURCES 2022-08-26T10:48:07+00:00 H T Liu <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> 2022-11-15T00:00:00+00:00 Copyright (c) 2022 H T Liu INACTIVATION EFFECTS OF NEGATIVE PRESSURES BY A METAL BERTHELOT TECHNIQUE ON BACTERIA SOLUTIONS 2022-09-19T11:20:06+00:00 Kazuki Hiro Momoko Imanishi Hiroshi Fukuoka Ayuko Itsuki Hiroki Kotake <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> 2022-11-23T00:00:00+00:00 Copyright (c) 2022 Kazuki Hiro, Momoko Imanishi, Hiroshi Fukuoka, Ayuko Itsuki 2 TOPOLOGY OPTIMIZATION OF PACKAGE SEALER JAW CHASSIS OF AUTOMATIC PACKAGING MACHINE 2023-01-04T04:21:07+00:00 Arif Sercan Erez Alim Filik Volkan Temizel <p><em>After the Covid-19 epidemic, the need to reach hygienic and sealed packaged food products has gained importance and the packaging machinery sector has become an important sector. In this context, the need for special packaging machines has increased. The jaw mechanism of the packaging machine developed within the scope of the study performs the package closing function by opening and closing 200 times per minute, and the jaw chassis carrying the jaw mechanism is exposed to the same series of movements. The design of the jaw chassis should be as light as possible so that no additional load is placed on the motors that provide the movement, while its strength should be high since it carries the entire load from the jaw plates to the motors.&nbsp;</em><em>&nbsp;To solve this problem, a structural optimization solution called topology optimization, which regulates the distribution of the elements in the design volume within the framework of the determined constraints, is used. With the performed topology optimization study, it has been determined that the new solid model, which continues to provide sufficient strength when exposed to 5000 N force, provides 11% weight gain. This work has been a pioneer for new research to obtain lightweight designs.</em></p> 2023-01-04T00:00:00+00:00 Copyright (c) 2023 Arif Sercan Erez, Alim Filik, Volkan Temizel