Strict Inequalities for the n-crossing Inequality
In2013,Adamsintroducedthen-crossingnumberofaknotK,denoted by cn(K).Inequalities between the 2-, 3-, 4-, and 5-crossing numbers have been previously established.We prove c9(K)≤c3(K)−2 for all knots Kthat are not the trivial, trefoil, or figure-eightknot.Weshowthisinequalityisoptimalandobtainpreviouslyunknownvalues for c9(K).
心線相依 The Extensions of Euler Line
此題出處為 Crux Mathematicorum, Vol. 44(4), Apr 2018[1]。已知H為△ABC 的垂心,自A、B與C往對邊̅BC、̅CA與̅AB 作三高,得三垂足為 D、E 與F,從△ABC的三邊往外作矩形,使其寬與三邊上的高成比例,再將這三個矩形相臨的頂點連起來,形成三組三角形。證明這三個三角形的中線會三線共點。事實上這點就是外心。 我將原題延伸為四種建構方法,從△ABC 的三邊往外作平行四邊形,分別連三個外接三角形,考慮其中線、角平分線、中垂線與高,以及三角形的五心。分析三線共點的情形。 本研究最特別之處是在四種建構96種情形中,共有69種共點。其中有7 種情形,當任意點J 配上三中線共點於P時,此時J、重心G與P點三點共線,且̅JG :̅GP=2 :1。當任意點J與垂心重合時,三中線共點於外心,此時這條直線即歐拉線。另外有 11 種情形,當任意點J配上三中線共點於P時,此J、重心G與P點三點共線,且̅JG :̅GP=1: 2。當任意點J與外心重合時,三中線共點於垂心,此時這條直線即歐拉線。且當f1(J,m)=P1,f2 (J , m)=P2,此時P2、P1、重心G與J共線。最特別的是當J與外心重合時, P1 是九點圓的圓心。
New Concept of Intelligent Wound Dressing
Substance losses, burns and injuries arising from various causes represent a constant problem encountered by homo sapiens throughout its existence. Rudimentary treatments, relatively effective and less effective, have left their mark on the way we perceive the presence and treatment of wounds caused by various factors. Searching through medical archives, we can trace the specific protocols for these medical conditions back to 2200 BC, when they were structured in three steps: 1) cleaning the skin lesion, 2) applying a dressing (from glue to various preparations) and 3 ) bandaging the skin lesion. Currently, the appearance of wounds on the skin is caused both by accidents in the performance of various activities and by certain diseases that manifest themselves through skin rashes or skin lesions. Their frequency is in the thousands, according to the latest statistics, affecting the majority of the population non-selectively. It is vital that skin lesions receive the necessary care and attention, commensurate with their severity. Being open wounds on the surface of the skin, it is essential that the treatment be meticulous and appropriate to their type, as skin lesions represent a threat to the patient's life. From infections to hydroelectrolytic imbalances specific to burns, the multitude of factors that influence healing highlight the need for a dressing that can be easily customized according to the specificity of the wound, the needs of the patient and that is affordable both from the point of view of production cost as well as its use, making death from skin lesions easily avoidable through an intelligent approach. One of the most complex biological processes and indispensable to humans is the healing of skin lesions. Healing involves a carefully regulated series of biochemical and cellular activities in tandem. Traditional therapies and substances of natural origin have been used to facilitate the regeneration process and accelerate the wound healing process, being applied with encouraging results. Despite the fact that these generally present a low cost, they can be more expensive than contemporary treatments and can be influenced by regional, seasonal factors, showing fluctuations from batch to batch, which could lead to unpredictable allergic reactions, side effects and inconsistent clinical findings. Currently, the standard of care for skin lesions is to clean the wound with antiseptic solutions to prevent infection, apply a dressing followed by bandaging to keep the dressing in place, and if necessary excision of the tissue that has become non-viable. In the case of diabetic ulcers, it is necessary to excise the tissue that has become non-viable and to maintain control over the level of glucose in the body.