$User->is_logged_in:  bool(false)
$User->user_info:  NULL
$User->check_post:  object(stdClass)#6652 (14) {
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  int(1)
  ["global_remaining_posts_to_view"]=>
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  ["remaining_posts_to_view"]=>
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  ["number_all_post"]=>
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  ["number_post_read"]=>
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  ["exceeded_daily_limit"]=>
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  ["is_watched_before"]=>
  int(0)
  ["sso_id"]=>
  int(12164)
  ["user_agent"]=>
  string(40) "CCBot/2.0 (https://commoncrawl.org/faq/)"
  ["user_ip"]=>
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  ["user_header"]=>
  object(stdClass)#6645 (42) {
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    ["REQUEST_URI"]=>
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    ["REDIRECT_HTTP_AUTHORIZATION"]=>
    NULL
    ["REDIRECT_STATUS"]=>
    string(3) "200"
    ["HTTP_AUTHORIZATION"]=>
    NULL
    ["HTTP_X_FORWARDED_PROTO"]=>
    string(5) "https"
    ["HTTP_CONNECTION"]=>
    string(7) "upgrade"
    ["HTTP_HOST"]=>
    string(16) "popsciarabia.com"
    ["HTTP_ACCEPT_ENCODING"]=>
    string(4) "gzip"
    ["HTTP_CF_RAY"]=>
    string(20) "85d530a12cdb080c-IAD"
    ["HTTP_CF_VISITOR"]=>
    string(22) "{\"scheme\":\"https\"}"
    ["HTTP_USER_AGENT"]=>
    string(40) "CCBot/2.0 (https://commoncrawl.org/faq/)"
    ["HTTP_ACCEPT"]=>
    string(63) "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"
    ["HTTP_ACCEPT_LANGUAGE"]=>
    string(14) "en-US,en;q=0.5"
    ["HTTP_CF_CONNECTING_IP"]=>
    string(13) "3.236.145.153"
    ["HTTP_CDN_LOOP"]=>
    string(10) "cloudflare"
    ["HTTP_CF_IPCOUNTRY"]=>
    string(2) "US"
    ["PATH"]=>
    string(60) "/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
    ["SERVER_SIGNATURE"]=>
    string(76) "
Apache/2.4.57 (Debian) Server at popsciarabia.com Port 80
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$User->gift_id:  NULL

أشباه المُوصِّلات Semiconductors

مواد تتميز بالقدرة على التوصيل الكهربائي، وتجمع بين قدرة المواد الموصلة كهربياً وقدرة المواد العازلة كهربياً، ويمكن أن تكون عناصر نقية؛ كالسليكون، أو مركبات؛ كمركب الجاليوم أرسنيد، وتدخل في العديد من الصناعات الإلكترونية؛ فهي حجر الأساس لصناعة الترانزستورات التي تملأ الأجهزة والدوائر الإلكترونية.

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