{"id":6746,"date":"2024-11-23T10:34:03","date_gmt":"2024-11-23T10:34:03","guid":{"rendered":"https:\/\/jinsuncarbon.com\/?p=6746"},"modified":"2024-12-29T00:21:17","modified_gmt":"2024-12-29T00:21:17","slug":"grafit-elektriksel-direnc","status":"publish","type":"post","link":"https:\/\/jinsuncarbon.com\/tr\/grafit-elektriksel-direnc\/","title":{"rendered":"Grafit Elektriksel Direncini Anlamak"},"content":{"rendered":"<p>Grafit elektriksel \u00f6zdirenci, iletkenli\u011fini g\u00f6steren fiziksel bir niceliktir. Bu y\u00f6ntem, farkl\u0131 grafit malzemelerdeki iletkenli\u011fi etkili bir \u015fekilde de\u011ferlendirmek i\u00e7in kullan\u0131lan bir tekniktir. Grafit elektrik direnci, birim uzunluk ba\u015f\u0131na direncin b\u00fcy\u00fckl\u00fc\u011f\u00fc ile ilgilidir ve genellikle ohm-metre cinsinden, k\u0131saca \u03a9-m olarak ifade edilir.<\/p><div id=\"ez-toc-container\" class=\"ez-toc-v2_0_85 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u0130\u00e7indekiler<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"\u0130\u00e7indekiler Tablosunu A\u00e7\/Kapat\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Ge\u00e7i\u015f<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/jinsuncarbon.com\/tr\/grafit-elektriksel-direnc\/#Graphite_Electrical_Resistivity_Measurement\" >Grafit Elektriksel \u00d6zdiren\u00e7 \u00d6l\u00e7\u00fcm\u00fc<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/jinsuncarbon.com\/tr\/grafit-elektriksel-direnc\/#Temperature_dependence_analysis\" >S\u0131cakl\u0131k ba\u011f\u0131ml\u0131l\u0131\u011f\u0131 analizi<\/a><ul class='ez-toc-list-level-5' ><li class='ez-toc-heading-level-5'><ul class='ez-toc-list-level-5' ><li class='ez-toc-heading-level-5'><ul class='ez-toc-list-level-5' ><li class='ez-toc-heading-level-5'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/jinsuncarbon.com\/tr\/grafit-elektriksel-direnc\/#The_following_table_shows_the_resistance_of_different_graphite_materials\" >A\u015fa\u011f\u0131daki tablo farkl\u0131 grafit malzemelerin direncini g\u00f6stermektedir<\/a><\/li><\/ul><\/li><\/ul><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/jinsuncarbon.com\/tr\/grafit-elektriksel-direnc\/#Factors_affecting_graphite_electrical_resistivity\" >Grafit elektrik direncini etkileyen fakt\u00f6rler<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/jinsuncarbon.com\/tr\/grafit-elektriksel-direnc\/#Material_purity\" >Malzeme safl\u0131\u011f\u0131<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/jinsuncarbon.com\/tr\/grafit-elektriksel-direnc\/#Grain_size_and_orientation\" >Tane boyutu ve y\u00f6nelimi<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/jinsuncarbon.com\/tr\/grafit-elektriksel-direnc\/#Structural_defects\" >Yap\u0131sal kusurlar<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/jinsuncarbon.com\/tr\/grafit-elektriksel-direnc\/#Comparison_of_the_electrical_conductivity_of_graphite_and_copper\" >Grafit ve bak\u0131r\u0131n elektrik iletkenli\u011finin kar\u015f\u0131la\u015ft\u0131r\u0131lmas\u0131<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/jinsuncarbon.com\/tr\/grafit-elektriksel-direnc\/#Conclusion\" >Sonu\u00e7<\/a><\/li><\/ul><\/nav><\/div>\n\n<h2><span class=\"ez-toc-section\" id=\"Graphite_Electrical_Resistivity_Measurement\"><\/span>Grafit Elektriksel \u00d6zdiren\u00e7 \u00d6l\u00e7\u00fcm\u00fc<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong>D\u00f6rt prob y\u00f6ntemi<\/strong><\/p>\n<p>D\u00f6rt prob y\u00f6ntemi, y\u00fcksek hassasiyetli \u00f6l\u00e7\u00fcm y\u00f6ntemi ile laboratuvarda en yayg\u0131n kullan\u0131lan y\u00f6ntemdir. D\u00f6rt prob, voltaj fark\u0131n\u0131 \u00f6l\u00e7erek \u00f6zdirenci hesaplamak i\u00e7in numune \u00fczerindeki ak\u0131ma basar. D\u00f6rt prob y\u00f6nteminin avantaj\u0131, temas direncinin etkisinden ka\u00e7\u0131nmay\u0131 gerektirir, \u00f6l\u00e7\u00fcm do\u011frulu\u011fu \u00e7ok y\u00fcksektir ve y\u0131\u011f\u0131n ve ince film \u015feklindeki numunelere uygulanabilir.<\/p>\n<p><strong><b>\u0130ki problu y\u00f6ntem<\/b><\/strong><\/p>\n<p>\u0130ki problu y\u00f6ntem, ak\u0131m\u0131 do\u011frudan numunenin her iki ucuna uygular ve voltaj\u0131 \u00f6l\u00e7er. Toplam direnci hesaplay\u0131n. \u0130ki problu y\u00f6ntemin avantaj\u0131, basit ve kullan\u0131m\u0131n\u0131n kolay olmas\u0131d\u0131r. Ayr\u0131ca, iki problu y\u00f6ntem h\u0131zl\u0131 ve d\u00fc\u015f\u00fck talepli \u00f6l\u00e7\u00fcm sahnelerine de uyum sa\u011flar.<\/p>\n<p><strong><b>S\u0131cak Tel Y\u00f6ntemi<\/b><\/strong><\/p>\n<p>S\u0131cak tel y\u00f6ntemi, s\u0131cakl\u0131\u011fa g\u00f6re de\u011fi\u015fen diren\u00e7 \u00f6zelliklerini \u00f6l\u00e7mek amac\u0131yla numunenin i\u00e7indeki s\u0131cak teli veya bobini \u0131s\u0131tmak i\u00e7in ak\u0131m kullan\u0131r. Bu y\u00f6ntem ayn\u0131 zamanda farkl\u0131 malzemelerin y\u00fcksek s\u0131cakl\u0131k ko\u015fullar\u0131 alt\u0131ndaki iletkenli\u011fini de inceler.<\/p>\n<p><strong><b>Y\u00fcksek S\u0131cakl\u0131k D\u00f6rt Prob Y\u00f6ntemi<\/b><\/strong><\/p>\n<p>Y\u00fcksek s\u0131cakl\u0131k ortam\u0131n\u0131n ko\u015fullar\u0131 alt\u0131ndaki \u00f6zdiren\u00e7 bu y\u00f6ntemle test edilebilir. Y\u00fcksek s\u0131cakl\u0131k d\u00f6rt prob y\u00f6ntemi, y\u00fcksek s\u0131cakl\u0131k performans de\u011ferlendirmesi i\u00e7in y\u00fcksek s\u0131cakl\u0131k f\u0131r\u0131n\u0131n\u0131 d\u00f6rt problu bir cihazla birle\u015ftirir.<\/p>\n<p><strong><b>Temas Direnci Y\u00f6ntemi<\/b><\/strong><\/p>\n<p>Temas direnci y\u00f6ntemi \u00e7o\u011funlukla yak\u0131n laboratuvar \u00e7al\u0131\u015fmalar\u0131 i\u00e7in kullan\u0131l\u0131r. Bir numunenin direncini test etmek i\u00e7in kullan\u0131lan do\u011fru \u00f6l\u00e7\u00fcmlerden biri Wheatstone k\u00f6pr\u00fcs\u00fc dengeli \u00f6l\u00e7\u00fcm devresidir.<\/p>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Temperature_dependence_analysis\"><\/span>S\u0131cakl\u0131k ba\u011f\u0131ml\u0131l\u0131\u011f\u0131 analizi<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>S\u0131cakl\u0131k ba\u011f\u0131ml\u0131l\u0131\u011f\u0131 analizi, grafit malzemede s\u0131cakl\u0131kla de\u011fi\u015fen diren\u00e7 kural\u0131n\u0131 inceleyebilir, grafitin kararl\u0131 ve ilgili iletken \u00f6zelli\u011fini kazanabilir ve y\u00fcksek s\u0131cakl\u0131klarda malzeme uygulamak i\u00e7in veri deste\u011fi sunabilir.<\/p>\n<p>&nbsp;<\/p>\n<h5><span class=\"ez-toc-section\" id=\"The_following_table_shows_the_resistance_of_different_graphite_materials\"><\/span>A\u015fa\u011f\u0131daki tablo farkl\u0131 grafit malzemelerin direncini g\u00f6stermektedir<span class=\"ez-toc-section-end\"><\/span><\/h5>\n<table>\n<tbody>\n<tr>\n<td width=\"213\">Grafit Malzeme T\u00fcr\u00fc<\/td>\n<td width=\"213\">\u00d6zdiren\u00e7 (1000\u00b0C) \/ \u03a9-m<\/td>\n<\/tr>\n<tr>\n<td width=\"213\">Y\u00fcksek Yo\u011funluklu Grafit<\/td>\n<td width=\"213\">\uff086.4\u00b10.9\uff09\u00d710<sup>-6\u00a0<\/sup><\/td>\n<\/tr>\n<tr>\n<td width=\"213\">Kaba Par\u00e7ac\u0131k Yap\u0131s\u0131 Grafit<\/td>\n<td width=\"213\">\uff089.2\u00b11.4\uff09\u00d710<sup>-6<\/sup><\/td>\n<\/tr>\n<tr>\n<td width=\"213\">\u0130nce Taneli Grafit<\/td>\n<td width=\"213\">\uff0812.9\u00b12.6\uff09\u00d710<sup>-6<\/sup><\/td>\n<\/tr>\n<tr>\n<td width=\"213\">Grafit Elektrot<\/td>\n<td width=\"213\">\uff087.5\u00b10.7\uff09\u00d710<sup>-6<\/sup><\/td>\n<\/tr>\n<tr>\n<td width=\"213\">G\u00f6zenekli Grafit<\/td>\n<td width=\"213\">\uff0812.0\u00b11.2\uff09\u00d710<sup>-6<\/sup><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2><\/h2>\n<h2><\/h2>\n<h2><span class=\"ez-toc-section\" id=\"Factors_affecting_graphite_electrical_resistivity\"><\/span>Grafit elektrik direncini etkileyen fakt\u00f6rler<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<h3><span class=\"ez-toc-section\" id=\"Material_purity\"><\/span>Malzeme safl\u0131\u011f\u0131<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p>Bir malzeme ne kadar az safs\u0131zl\u0131k i\u00e7erirse, direnci o kadar d\u00fc\u015f\u00fck olur<\/p>\n<h3><span class=\"ez-toc-section\" id=\"Grain_size_and_orientation\"><\/span>Tane boyutu ve y\u00f6nelimi<span class=\"ez-toc-section-end\"><\/span><\/h3>\n<p><strong><b>Tane b\u00fcy\u00fckl\u00fc\u011f\u00fc<\/b><\/strong><\/p>\n<p>Grafitin elektrik direnci \u00f6nemli \u00f6l\u00e7\u00fcde tane boyutuna ve y\u00f6nelimine ba\u011fl\u0131d\u0131r. Daha b\u00fcy\u00fck boyutlu taneler, tane s\u0131n\u0131r\u0131 sa\u00e7\u0131lma etkisini azalt\u0131r ve iletken yolun daha fazla s\u00fcreklili\u011fine izin vererek direnci azalt\u0131r; tersine, daha k\u00fc\u00e7\u00fck taneler, daha s\u0131k elektron sa\u00e7\u0131lmas\u0131na ve dolay\u0131s\u0131yla direncin artmas\u0131na neden olan artan tane s\u0131n\u0131rlar\u0131na sahiptir.<\/p>\n<p><strong><b>Oryantasyon<\/b><\/strong><\/p>\n<p>Grafit bir <a href=\"https:\/\/en.wikipedia.org\/wiki\/Anisotropy\" target=\"_blank\" rel=\"noopener\">anizotropik<\/a> katman d\u00fczlemi (a-b d\u00fczlemi) boyunca elektronlar\u0131n ak\u0131\u015f\u0131na kar\u015f\u0131 d\u00fc\u015f\u00fck diren\u00e7li ve d\u00fc\u015f\u00fck diren\u00e7li malzeme. Buna kar\u015f\u0131l\u0131k, katman d\u00fczlemine (c ekseni) dik olarak etki eden van der Waals kuvveti nedeniyle direnci \u00f6nemli \u00f6l\u00e7\u00fcde artar. Bu nedenle, tane ne kadar b\u00fcy\u00fckse ve tane y\u00f6n\u00fc ak\u0131m ak\u0131\u015f y\u00f6n\u00fcne ne kadar yak\u0131nsa, grafitin direnci o kadar d\u00fc\u015f\u00fck olacakt\u0131r.<\/p>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Structural_defects\"><\/span>Yap\u0131sal kusurlar<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p><strong><b>Kafes kusurlar\u0131<\/b><\/strong><\/p>\n<p>Grafitteki bo\u015fluklar ve safs\u0131zl\u0131k atomlar\u0131 gibi noktasal kusurlar, karbon atomlar\u0131n\u0131n tam \u03c0 ba\u011f sistemini yok edecek, elektronlar\u0131n bir katman i\u00e7indeki serbest hareketini engelleyecek ve b\u00f6ylece direnci art\u0131racakt\u0131r.<\/p>\n<p><strong><b>Tane s\u0131n\u0131r\u0131 kusurlar\u0131<\/b><\/strong><\/p>\n<p>Tane s\u0131n\u0131rlar\u0131n\u0131n varl\u0131\u011f\u0131 elektron sa\u00e7\u0131lmas\u0131n\u0131 art\u0131rarak elektronlar\u0131n taneler aras\u0131nda ak\u0131\u015f\u0131n\u0131 engeller ve direncin artmas\u0131na neden olur. Dahas\u0131, tane s\u0131n\u0131rlar\u0131n\u0131n say\u0131s\u0131 artt\u0131k\u00e7a veya tane boyutu k\u00fc\u00e7\u00fcld\u00fck\u00e7e, bu etki daha belirgin hale gelir.<\/p>\n<p><strong><b>Ara katman kusurlar\u0131<\/b><\/strong><\/p>\n<p>Katmanlar aras\u0131ndaki bu dislokasyon, k\u0131r\u0131\u015f\u0131kl\u0131k veya bo\u015fluk grafit aras\u0131ndaki iletkenli\u011fi azaltacakt\u0131r <a href=\"https:\/\/en.wikipedia.org\/wiki\/Graphite\" target=\"_blank\" rel=\"noopener\">katmanlar<\/a>elektronlar\u0131n c-ekseni y\u00f6n\u00fcnde daha zor akmas\u0131n\u0131 sa\u011flayarak direncini dikey olarak \u00f6nemli \u00f6l\u00e7\u00fcde art\u0131r\u0131r.<\/p>\n<p><strong><b>G\u00f6zeneklilik ve \u00e7atlaklar<\/b><\/strong><\/p>\n<p>\u00dcr\u00fcndeki g\u00f6zenekler ve \u00e7atlaklar grafitin etkin iletkenlik alan\u0131n\u0131 d\u00fc\u015f\u00fcr\u00fcr, ak\u0131m yolunu uzat\u0131r ve direncin artmas\u0131na neden olur.<\/p>\n<p><strong><b>S\u0131cakl\u0131k etkileri<\/b><\/strong><\/p>\n<p>Kalsinasyon veya<a href=\"https:\/\/jinsuncarbon.com\/tr\/grafi%cc%87tleme-nedi%cc%87r\/\"> grafitle\u015ftirme<\/a> s\u0131cakl\u0131k artt\u0131k\u00e7a, \u00fcr\u00fcn\u00fcn \u00f6zg\u00fcl direnci kademeli olarak azal\u0131r. Ancak azalman\u0131n nedenleri farkl\u0131d\u0131r. Kavurma a\u015famas\u0131 s\u0131ras\u0131nda, \u00f6zg\u00fcl diren\u00e7teki d\u00fc\u015f\u00fc\u015f temel olarak u\u00e7ucular\u0131n sal\u0131nmas\u0131, ba\u011flay\u0131c\u0131lar\u0131n kokla\u015fmas\u0131 ve \u00fcr\u00fcn\u00fcn s\u00fcrekli b\u00fcz\u00fclmesinden kaynaklanmaktad\u0131r. Grafitle\u015ftirme a\u015famas\u0131 s\u0131ras\u0131nda, \u00f6zg\u00fcl diren\u00e7teki d\u00fc\u015f\u00fc\u015f amorf karbonun <a href=\"https:\/\/jinsuncarbon.com\/tr\/grafi%cc%87t-nedi%cc%87r-ve-grafi%cc%87t-neyden-yapilir\/\">grafit<\/a> Kristal yap\u0131.<\/p>\n<p><strong><b>D\u0131\u015f bas\u0131n\u00e7<\/b><\/strong><\/p>\n<p>D\u0131\u015f bas\u0131n\u00e7, grafit yap\u0131n\u0131n g\u00f6zeneklerini s\u0131k\u0131\u015ft\u0131rarak malzemenin yo\u011funla\u015fmas\u0131n\u0131 art\u0131r\u0131r. Bas\u0131n\u00e7 ayr\u0131ca grafit kristal katmanlar\u0131n\u0131n d\u00fczenini etkiler ve c ekseni y\u00f6n\u00fcndeki direnci azalt\u0131r. Genel olarak, d\u0131\u015f bas\u0131n\u00e7 g\u00f6zeneklili\u011fin azalt\u0131lmas\u0131na, tane ba\u011flant\u0131s\u0131n\u0131n iyile\u015ftirilmesine ve katmanlar aras\u0131 d\u00fczenlemenin geli\u015ftirilmesine yans\u0131r.<\/p>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Comparison_of_the_electrical_conductivity_of_graphite_and_copper\"><\/span>Grafit ve bak\u0131r\u0131n elektrik iletkenli\u011finin kar\u015f\u0131la\u015ft\u0131r\u0131lmas\u0131<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Normal s\u0131cakl\u0131k uygulamalar\u0131nda bak\u0131r grafitten daha y\u00fcksek iletkenli\u011fe sahiptir; ancak y\u00fcksek s\u0131cakl\u0131k uygulamalar\u0131nda grafit bak\u0131rdan daha y\u00fcksek bir iletkenli\u011fe sahiptir.<\/p>\n<p>&nbsp;<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Sonu\u00e7<span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Direncin grafitin elektriksel \u00f6zelli\u011fi \u00fczerinde b\u00fcy\u00fck bir etkisi vard\u0131r. Elektriksel diren\u00e7, grafitin elektriksel \u00f6zelli\u011fini belirleyen kritik fakt\u00f6rlerden biridir. Grafitin iletkenli\u011fi ne kadar k\u00fc\u00e7\u00fckse, iletkenli\u011fi o kadar iyi ve enerji t\u00fcketimi o kadar d\u00fc\u015f\u00fck olur.<\/p>","protected":false},"excerpt":{"rendered":"<p>Graphite electrical resistivity is an amount of a physical quantity, indicating its conductivity. This method is the technique for assessing conductivity in different graphite materials effectively. The graphite electric resistivity pertains to the size of the resistance per unit length and is generally expressed in ohm-meter, short as \u03a9\u00b7m. Graphite Electrical Resistivity Measurement Four-probe method [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":6755,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[62],"tags":[],"class_list":["post-6746","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-application"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v19.2.1 (Yoast SEO v27.8) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Understanding Graphite Electrical Resistivity<\/title>\n<meta name=\"description\" content=\"Graphite electrical resistivity pertains to the size of the resistance per unit length and is generally expressed in ohm-meters, short as \u03a9\u00b7m\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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