193 research outputs found

    合成樹脂の炭化に関する研究 : ジビニル系ならびに複素 5 員環系樹脂の炭化(A. 理学)

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    The present report is to study the thermal-stability of the various synthetic resins prepared from divinyl polymers and five-membered heterocyclic compounds. Oxidized pure-divinyl benzene polymer (DVBP) was proved to show the most excellent thermal-stability of all. Each resin was carbonized at heat treatment temperature range 300-2300℃. X-ray diffraction patterns of the carbons were checked to examin graphitization characters. Among the divinyl groups, the carbon derived from DVBP was found to exhibit typical non-graphitizing characters and the carbons derived from divinyl ether and divinyl sulfone polymers were found to exhibit graphitizing characters. Among the five-membered heterocyclic resins, the carbons derived from furfural, furfuryl alcohol and furan resins were found to exhibit non-graphitizing characters and the carbons derived from cocondensed pyrrole resins were found to exhibit graphitizing characters

    The Animal Model of Spinal Cord Injury as an Experimental Pain Model

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    Pain, which remains largely unsolved, is one of the most crucial problems for spinal cord injury patients. Due to sensory problems, as well as motor dysfunctions, spinal cord injury research has proven to be complex and difficult. Furthermore, many types of pain are associated with spinal cord injury, such as neuropathic, visceral, and musculoskeletal pain. Many animal models of spinal cord injury exist to emulate clinical situations, which could help to determine common mechanisms of pathology. However, results can be easily misunderstood and falsely interpreted. Therefore, it is important to fully understand the symptoms of human spinal cord injury, as well as the various spinal cord injury models and the possible pathologies. The present paper summarizes results from animal models of spinal cord injury, as well as the most effective use of these models

    SIMULATION OF BIO-GEOCHEMICAL PROCESSES IN A COASTAL AQUIFER

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    Numerical models which discuss about the bio-geochemical processes which take place in coastal aquifers are still limited. Bacteria mediated reduction is one of the main causes which directly contributes to the groundwater quality of coastal aquifers. In this study a two-dimensional numerical model was developed to simulate the bacteria mediated reduction processes which are occurring in the coastal aquifers. The model was applied to a cross section of Kujyukurihama coast in Chiba prefecture, Japan, where a reduced environment has been formed. The objective of this paper is not to provide an orthodox numerical simulation practice, but to convince the numerical modellers; the possibility of the simulation of bacterial reduction processes in coastal subsurface environments. This paper provides a preliminary numerical study of the reduction of MnO 2 and Fe(OH) 3 under anaerobic bacteria mediation. Further researches are needed to improve the numerical simulations on the reduction environments in coastal aquifers

    OpenPLC based control system testbed for PLC whitelisting system

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    This paper proposes a security testbed system for industrial control systems. In control systems, controllers are final fortresses to continue the operation of field systems. Then, we need countermeasures of controllers. The whitelisting function is efficient in controller security. The whitelisting function registers normal operations in a list and detects unregistered operations as abnormal. We need a testbed system to check whether the whitelist function does not affect other functions of the controller. The industrial controller and its engineering tool are relatively expensive, and are customized with respect to controller vendors. To enhance the whitelist development, this study proposes a testbed system using OpenPLC which is an open-source software. This system is independent of controller vendors and is applicable for controller programming languages. We implement a whitelist based anomaly detection method for the testbed system and validate that the anomaly detection method operates correctly

    bFGF Regulates PI3-Kinase-Rac1-JNK Pathway and Promotes Fibroblast Migration in Wound Healing

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    Fibroblast proliferation and migration play important roles in wound healing. bFGF is known to promote both fibroblast proliferation and migration during the process of wound healing. However, the signal transduction of bFGF-induced fibroblast migration is still unclear, because bFGF can affect both proliferation and migration. Herein, we investigated the effect of bFGF on fibroblast migration regardless of its effect on fibroblast proliferation. We noticed involvement of the small GTPases of the Rho family, PI3-kinase, and JNK. bFGF activated RhoA, Rac1, PI3-kinase, and JNK in cultured fibroblasts. Inhibition of RhoA did not block bFGF-induced fibroblast migration, whereas inhibition of Rac1, PI3-kinase, or JNK blocked the fibroblast migration significantly. PI3-kinase-inhibited cells down-regulated the activities of Rac1 and JNK, and Rac1-inhibited cells down-regulated JNK activity, suggesting that PI3-kinase is upstream of Rac1 and that JNK is downstream of Rac1. Thus, we concluded that PI3-kinase, Rac1, and JNK were essential for bFGF-induced fibroblast migration, which is a novel pathway of bFGF-induced cell migration
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