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ByGSpeech

रबर बैंड से बना फ्रिज

यह सुनने में तो थोड़ा अजीब लगता है लेकिन रबर बैंड से भी रेफ्रीजरेटर बनाया जा सकता है। इसका एक छोटा-सा अनुभव आप भी कर सकते हैं। रबर बैंड को खींचते हुए अपने होंठों के पास लाइए, आप थोड़ी थोड़ी गर्माहट महसूस करेंगे। वापस छोड़ने पर यह ठंडा भी हो जाता है। इसे इलास्टोकैलोरिक प्रभाव कहते हैं जो ठीक उसी तरह गर्मी को स्थानांतरित करता है जिस तरह रेफ्रीजरेटर या एयर कंडीशनर में तरल को दबाकर और फिर फैलाकर किया जाता है। वैज्ञानिकों ने इसका एक ऐसा संस्करण भी तैयार किया है जिसमें रबर बैंड को खींचने के अलावा मरोड़ा या ऐंठा भी जाता है।    


इस मरोड़ने की तकनीक पर आधारित फ्रिज पर अध्ययन करते हुए चीन स्थित नंकाई युनिवर्सिटी, तियांजिन के इंजीनियरिंग स्नातक रन वांग और उनके सहयोगियों ने रबर फाइबर, नायलॉन, पॉलीएथिलीन के तार और निकल-टाइटेनियम तारों की शीतलन शक्ति की तुलना की। प्रत्येक सामग्री के 3 सेंटीमीटर लचीले फाइबर को रोटरी उपकरण की मदद से मरोड़ा गया। ऐसा करने पर ऐंठन की वजह से कुंडलियां बनीं और कुंडलियों से सुपर-कुंडलियां बन गर्इं। ऐसा करने पर विभिन्न फाइबर 15 डिग्री सेल्सियस तक गर्म हुए और ढीला छोड़ने पर उतने ही ठंडे भी हो गए।
मरोड़ने पर गर्म होने की प्रक्रिया को समझने के लिए शोधकर्ताओं ने प्रत्येक फाइबर की आणविक संरचना को देखने के लिए एक्स-रे का उपयोग किया। मरोड़ने के बल ने अणुओं को अधिक व्यवस्थित कर दिया। चूंकि कुल व्यवस्था में कोई बदलाव नहीं आता है, इसलिए आणविक कंपन में वृद्धि हुई और तापमान बढ़ा।  
इस प्रक्रिया की ठंडा करने की क्षमता देखने के लिए शोधकर्ताओं ने मरोड़ने और खोलने की प्रक्रिया को पानी में करके देखा। रबर फाइबर में उन्होंने लगभग 20 जूल प्रति ग्राम ऊष्मा विनिमय दर्ज किया। यह माप मरोड़ने वाले उपकरण द्वारा खर्च की गई ऊर्जा की तुलना में आठ गुना अधिक था। अन्य फाइबरों का प्रदर्शन भी ऐसा ही रहा। साइंस में प्रकाशित एक रिपोर्ट के अनुसार इनकी दक्षता का स्तर मानक शीतलकों से तुलनीय है और बिना मरोड़े केवल खींचने से दो गुना अधिक।    
यह डिज़ाइन उन शीतलन तरलों की ज़रूरत को कम कर सकती है जो ग्लोबल वार्मिंग में योगदान देते हैं। हालांकि शीतलन उपकरणों में ओज़ोन को क्षति पहुंचाने वाले क्लोरोफ्लोरोकार्बन को तो खत्म किया जा चुका है लेकिन उसकी जगह इस्तेमाल किए जाने वाले अन्य रसायन ग्रीनहाउस गैसों की श्रेणी में आते हैं जो कार्बन डाईऑक्साइड से अधिक घातक हैं।  
इस शोधपत्र के लेखक और युनिवर्सिटी ऑफ टेक्सास, डलास के भौतिक विज्ञानी रे बॉगमैन और उनकी टीम ने नमूने के तौर पर निकल टाइटेनियम तारों की मदद से बॉल पॉइंट पेन के आकार का एक छोटा फ्रिज तैयार किया है। इस ट्विस्टोकैलोरिक विधि की मदद से उन्होंने चंद सेकंड में पानी की थोड़ी-सी मात्रा को 8 डिग्री सेल्सियस तक ठंडा कर दिया। (स्रोत फीचर्स)

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J! InfoRequestSessionProfileQueries141Log
14.17MBMemory Usage198msRequest Duration
Joomla! Version4.4.5
PHP Version8.1.31
Identityguest
Response200
Templatej51_maya
Database
Server
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Version
8.0.40
Collation
utf8mb4_0900_ai_ci
Conn Collation
utf8mb4_0900_ai_ci
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[]
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array:1 [ "joomla" => "***redacted***" ]
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$_SERVER
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141 statements were executed, 3 of which were duplicates, 138 unique59.25ms2.95MB
UniquesDuplicates 1
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  • SELECT * FROM j4_rsform_config201μs2.56KB/administrator/components/com_rsform/helpers/config.php:52Copy
  • SELECT `m`.`id`,`m`.`menutype`,`m`.`title`,`m`.`alias`,`m`.`note`,`m`.`link`,`m`.`type`,`m`.`level`,`m`.`language`,`m`.`browserNav`,`m`.`access`,`m`.`params`,`m`.`home`,`m`.`img`,`m`.`template_style_id`,`m`.`component_id`,`m`.`parent_id`,`m`.`path` AS `route`,`e`.`element` AS `component` FROM `j4_menu` AS `m` LEFT JOIN `j4_extensions` AS `e` ON `m`.`component_id` = `e`.`extension_id` WHERE ( (`m`.`published` = 1 AND `m`.`parent_id` > 0 AND `m`.`client_id` = 0) AND (`m`.`publish_up` IS NULL OR `m`.`publish_up` <= :currentDate1)) AND (`m`.`publish_down` IS NULL OR `m`.`publish_down` >= :currentDate2) ORDER BY `m`.`lft`2.58ms167.05KBParams/libraries/src/Menu/SiteMenu.php:166Copy
  • SELECT `c`.`id`,`c`.`asset_id`,`c`.`access`,`c`.`alias`,`c`.`checked_out`,`c`.`checked_out_time`,`c`.`created_time`,`c`.`created_user_id`,`c`.`description`,`c`.`extension`,`c`.`hits`,`c`.`language`,`c`.`level`,`c`.`lft`,`c`.`metadata`,`c`.`metadesc`,`c`.`metakey`,`c`.`modified_time`,`c`.`note`,`c`.`params`,`c`.`parent_id`,`c`.`path`,`c`.`published`,`c`.`rgt`,`c`.`title`,`c`.`modified_user_id`,`c`.`version`, CASE WHEN CHAR_LENGTH(`c`.`alias`) != 0 THEN CONCAT_WS(':', `c`.`id`, `c`.`alias`) ELSE `c`.`id` END as `slug` FROM `j4_categories` AS `s` INNER JOIN `j4_categories` AS `c` ON (`s`.`lft` <= `c`.`lft` AND `c`.`lft` < `s`.`rgt`) OR (`c`.`lft` < `s`.`lft` AND `s`.`rgt` < `c`.`rgt`) WHERE (`c`.`extension` = :extension OR `c`.`extension` = 'system') AND `c`.`published` = 1 AND `s`.`id` = :id ORDER BY `c`.`lft`3.61ms1.67MBParams/libraries/src/Categories/Categories.php:375Copy
  • SELECT * FROM `j4_languages` WHERE `published` = 1 ORDER BY `ordering` ASC396μs2.22KB/libraries/src/Language/LanguageHelper.php:142Copy
  • SELECT `id`,`home`,`template`,`s`.`params`,`inheritable`,`parent` FROM `j4_template_styles` AS `s` LEFT JOIN `j4_extensions` AS `e` ON `e`.`element` = `s`.`template` AND `e`.`type` = 'template' AND `e`.`client_id` = `s`.`client_id` WHERE `s`.`client_id` = 0 AND `e`.`enabled` = 1487μs1.14KB/administrator/components/com_templates/src/Model/StyleModel.php:773Copy
  • SELECT `id`,`name`,`rules`,`parent_id` FROM `j4_assets` WHERE `name` IN (:preparedArray1,:preparedArray2,:preparedArray3,:preparedArray4,:preparedArray5,:preparedArray6,:preparedArray7,:preparedArray8,:preparedArray9,:preparedArray10,:preparedArray11,:preparedArray12,:preparedArray13,:preparedArray14,:preparedArray15,:preparedArray16,:preparedArray17,:preparedArray18,:preparedArray19,:preparedArray20,:preparedArray21,:preparedArray22,:preparedArray23,:preparedArray24,:preparedArray25,:preparedArray26,:preparedArray27,:preparedArray28,:preparedArray29,:preparedArray30,:preparedArray31,:preparedArray32,:preparedArray33,:preparedArray34,:preparedArray35,:preparedArray36,:preparedArray37,:preparedArray38,:preparedArray39,:preparedArray40,:preparedArray41,:preparedArray42,:preparedArray43,:preparedArray44,:preparedArray45,:preparedArray46,:preparedArray47)975μs8.12KBParams/libraries/src/Access/Access.php:357Copy
  • SELECT `id`,`name`,`rules`,`parent_id` FROM `j4_assets` WHERE `name` LIKE :asset OR `name` = :extension OR `parent_id` = 05.47ms345.8KBParams/libraries/src/Access/Access.php:301Copy
  • SHOW FULL COLUMNS FROM `j4_content`1.69ms2.39KB/libraries/vendor/joomla/database/src/Mysqli/MysqliDriver.php:625Copy
  • UPDATE `j4_content` SET `hits` = (`hits` + 1) WHERE `id` = '3608'2.25ms2.55KB/libraries/src/Table/Table.php:1325Copy
  • SELECT `a`.`id`,`a`.`asset_id`,`a`.`title`,`a`.`alias`,`a`.`introtext`,`a`.`fulltext`,`a`.`state`,`a`.`catid`,`a`.`created`,`a`.`created_by`,`a`.`created_by_alias`,`a`.`modified`,`a`.`modified_by`,`a`.`checked_out`,`a`.`checked_out_time`,`a`.`publish_up`,`a`.`publish_down`,`a`.`images`,`a`.`urls`,`a`.`attribs`,`a`.`version`,`a`.`ordering`,`a`.`metakey`,`a`.`metadesc`,`a`.`access`,`a`.`hits`,`a`.`metadata`,`a`.`featured`,`a`.`language`,`fp`.`featured_up`,`fp`.`featured_down`,`c`.`title` AS `category_title`,`c`.`alias` AS `category_alias`,`c`.`access` AS `category_access`,`c`.`language` AS `category_language`,`fp`.`ordering`,`u`.`name` AS `author`,`parent`.`title` AS `parent_title`,`parent`.`id` AS `parent_id`,`parent`.`path` AS `parent_route`,`parent`.`alias` AS `parent_alias`,`parent`.`language` AS `parent_language`,ROUND(`v`.`rating_sum` / `v`.`rating_count`, 1) AS `rating`,`v`.`rating_count` AS `rating_count` FROM `j4_content` AS `a` INNER JOIN `j4_categories` AS `c` ON `c`.`id` = `a`.`catid` LEFT JOIN `j4_content_frontpage` AS `fp` ON `fp`.`content_id` = `a`.`id` LEFT JOIN `j4_users` AS `u` ON `u`.`id` = `a`.`created_by` LEFT JOIN `j4_categories` AS `parent` ON `parent`.`id` = `c`.`parent_id` LEFT JOIN `j4_content_rating` AS `v` ON `a`.`id` = `v`.`content_id` WHERE ( (`a`.`id` = :pk AND `c`.`published` > 0) AND (`a`.`publish_up` IS NULL OR `a`.`publish_up` <= :publishUp)) AND (`a`.`publish_down` IS NULL OR `a`.`publish_down` >= :publishDown) AND `a`.`state` IN (:preparedArray1,:preparedArray2)835μs24.63KBParams/components/com_content/src/Model/ArticleModel.php:215Copy
  • SELECT `c`.`id`,`c`.`asset_id`,`c`.`access`,`c`.`alias`,`c`.`checked_out`,`c`.`checked_out_time`,`c`.`created_time`,`c`.`created_user_id`,`c`.`description`,`c`.`extension`,`c`.`hits`,`c`.`language`,`c`.`level`,`c`.`lft`,`c`.`metadata`,`c`.`metadesc`,`c`.`metakey`,`c`.`modified_time`,`c`.`note`,`c`.`params`,`c`.`parent_id`,`c`.`path`,`c`.`published`,`c`.`rgt`,`c`.`title`,`c`.`modified_user_id`,`c`.`version`, CASE WHEN CHAR_LENGTH(`c`.`alias`) != 0 THEN CONCAT_WS(':', `c`.`id`, `c`.`alias`) ELSE `c`.`id` END as `slug` FROM `j4_categories` AS `s` INNER JOIN `j4_categories` AS `c` ON (`s`.`lft` <= `c`.`lft` AND `c`.`lft` < `s`.`rgt`) OR (`c`.`lft` < `s`.`lft` AND `s`.`rgt` < `c`.`rgt`) WHERE (`c`.`extension` = :extension OR `c`.`extension` = 'system') AND `c`.`access` IN (:preparedArray1) AND `c`.`published` = 1 AND `s`.`id` = :id ORDER BY `c`.`lft`3.16ms21.19KBParams/libraries/src/Categories/Categories.php:375Copy
  • SELECT `m`.`tag_id`,`t`.* FROM `j4_contentitem_tag_map` AS `m` INNER JOIN `j4_tags` AS `t` ON `m`.`tag_id` = `t`.`id` WHERE `m`.`type_alias` = :contentType AND `m`.`content_item_id` = :id AND `t`.`published` = 1 AND `t`.`access` IN (:preparedArray1)498μs5.2KBParams/libraries/src/Helper/TagsHelper.php:388Copy
  • SELECT `c`.`id`,`c`.`asset_id`,`c`.`access`,`c`.`alias`,`c`.`checked_out`,`c`.`checked_out_time`,`c`.`created_time`,`c`.`created_user_id`,`c`.`description`,`c`.`extension`,`c`.`hits`,`c`.`language`,`c`.`level`,`c`.`lft`,`c`.`metadata`,`c`.`metadesc`,`c`.`metakey`,`c`.`modified_time`,`c`.`note`,`c`.`params`,`c`.`parent_id`,`c`.`path`,`c`.`published`,`c`.`rgt`,`c`.`title`,`c`.`modified_user_id`,`c`.`version`, CASE WHEN CHAR_LENGTH(`c`.`alias`) != 0 THEN CONCAT_WS(':', `c`.`id`, `c`.`alias`) ELSE `c`.`id` END as `slug` FROM `j4_categories` AS `s` INNER JOIN `j4_categories` AS `c` ON (`s`.`lft` <= `c`.`lft` AND `c`.`lft` < `s`.`rgt`) OR (`c`.`lft` < `s`.`lft` AND `s`.`rgt` < `c`.`rgt`) WHERE (`c`.`extension` = :extension OR `c`.`extension` = 'system') AND `c`.`access` IN (:preparedArray1) AND `c`.`published` = 1 AND `s`.`id` = :id ORDER BY `c`.`lft`3.12ms21.19KBParams/libraries/src/Categories/Categories.php:375Copy
  • SELECT DISTINCT a.id, a.title, a.name, a.checked_out, a.checked_out_time, a.note, a.state, a.access, a.created_time, a.created_user_id, a.ordering, a.language, a.fieldparams, a.params, a.type, a.default_value, a.context, a.group_id, a.label, a.description, a.required, a.only_use_in_subform,l.title AS language_title, l.image AS language_image,uc.name AS editor,ag.title AS access_level,ua.name AS author_name,g.title AS group_title, g.access as group_access, g.state AS group_state, g.note as group_note FROM j4_fields AS a LEFT JOIN `j4_languages` AS l ON l.lang_code = a.language LEFT JOIN j4_users AS uc ON uc.id=a.checked_out LEFT JOIN j4_viewlevels AS ag ON ag.id = a.access LEFT JOIN j4_users AS ua ON ua.id = a.created_user_id LEFT JOIN j4_fields_groups AS g ON g.id = a.group_id LEFT JOIN `j4_fields_categories` AS fc ON fc.field_id = a.id WHERE ( (`a`.`context` = :context AND (`fc`.`category_id` IS NULL OR `fc`.`category_id` IN (:preparedArray1,:preparedArray2,:preparedArray3,:preparedArray4,:preparedArray5)) AND `a`.`access` IN (:preparedArray6)) AND (`a`.`group_id` = 0 OR `g`.`access` IN (:preparedArray7)) AND `a`.`state` = :state) AND (`a`.`group_id` = 0 OR `g`.`state` = :gstate) AND `a`.`only_use_in_subform` = :only_use_in_subform ORDER BY a.ordering ASC700μs6.06KBParams/libraries/src/MVC/Model/BaseDatabaseModel.php:166Copy
  • SELECT `c`.`id`,`c`.`asset_id`,`c`.`access`,`c`.`alias`,`c`.`checked_out`,`c`.`checked_out_time`,`c`.`created_time`,`c`.`created_user_id`,`c`.`description`,`c`.`extension`,`c`.`hits`,`c`.`language`,`c`.`level`,`c`.`lft`,`c`.`metadata`,`c`.`metadesc`,`c`.`metakey`,`c`.`modified_time`,`c`.`note`,`c`.`params`,`c`.`parent_id`,`c`.`path`,`c`.`published`,`c`.`rgt`,`c`.`title`,`c`.`modified_user_id`,`c`.`version`, CASE WHEN CHAR_LENGTH(`c`.`alias`) != 0 THEN CONCAT_WS(':', `c`.`id`, `c`.`alias`) ELSE `c`.`id` END as `slug` FROM `j4_categories` AS `s` INNER JOIN `j4_categories` AS `c` ON (`s`.`lft` <= `c`.`lft` AND `c`.`lft` < `s`.`rgt`) OR (`c`.`lft` < `s`.`lft` AND `s`.`rgt` < `c`.`rgt`) WHERE (`c`.`extension` = :extension OR `c`.`extension` = 'system') AND `c`.`access` IN (:preparedArray1) AND `c`.`published` = 1 AND `s`.`id` = :id ORDER BY `c`.`lft`3ms21.19KBParams/libraries/src/Categories/Categories.php:375Copy
  • SELECT m.id, m.title, m.module, m.position, m.content, m.showtitle, m.params,am.params AS extra, 0 AS menuid, m.publish_up, m.publish_down FROM j4_modules AS m LEFT JOIN j4_extensions AS e ON e.element = m.module AND e.client_id = m.client_id LEFT JOIN j4_advancedmodules as am ON am.module_id = m.id WHERE m.published = 1 AND e.enabled = 1 AND m.client_id = 0 ORDER BY m.position, m.ordering908μs50.67KB/plugins/system/advancedmodules/src/Helper.php:191Copy
  • SELECT m.condition_id,m.item_id FROM j4_conditions_map as m LEFT JOIN j4_conditions as c ON c.id = m.condition_id WHERE `m`.`extension` = 'com_advancedmodules' AND `c`.`published` = 1437μs1.75KB/administrator/components/com_conditions/src/Model/ItemModel.php:821Copy
  • SHOW FULL COLUMNS FROM `j4_conditions`777μs2.08KB/libraries/vendor/joomla/database/src/Mysqli/MysqliDriver.php:625Copy
  • SELECT * FROM `j4_conditions` WHERE `id` = '14'217μs2.06KB/libraries/src/Table/Table.php:755Copy
  • SELECT * FROM j4_conditions_groups as g WHERE g.condition_id = 14203μs1KB/administrator/components/com_conditions/src/Model/ItemModel.php:1034Copy
  • SELECT * FROM j4_conditions_rules as r WHERE r.group_id = 14182μs1.13KB/administrator/components/com_conditions/src/Model/GroupModel.php:108Copy
  • SELECT m.extension,m.item_id,m.table,m.name_column FROM j4_conditions_map as m WHERE m.condition_id = 14 ORDER BY m.extension,m.item_id200μs1KB/administrator/components/com_conditions/src/Model/ItemModel.php:907Copy
  • SELECT `id`,`title` AS `value` FROM `j4_modules`274μs3.38KB/administrator/components/com_conditions/src/Helper/Helper.php:184Copy
  • SHOW FULL COLUMNS FROM `j4_modules`844μs2.2KB/libraries/vendor/joomla/database/src/Mysqli/MysqliDriver.php:625Copy
  • SELECT `id`,`published` AS `value` FROM `j4_modules`174μs14.38KB/administrator/components/com_conditions/src/Helper/Helper.php:184Copy
  • SELECT * FROM `j4_conditions` WHERE `id` = '15'237μs2.06KB/libraries/src/Table/Table.php:755Copy
  • SELECT * FROM j4_conditions_groups as g WHERE g.condition_id = 15188μs1008B/administrator/components/com_conditions/src/Model/ItemModel.php:1034Copy
  • SELECT m.extension,m.item_id,m.table,m.name_column FROM j4_conditions_map as m WHERE m.condition_id = 15 ORDER BY m.extension,m.item_id188μs1KB/administrator/components/com_conditions/src/Model/ItemModel.php:907Copy
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  • SELECT m.extension,m.item_id,m.table,m.name_column FROM j4_conditions_map as m WHERE m.condition_id = 16 ORDER BY m.extension,m.item_id734μs1KB/administrator/components/com_conditions/src/Model/ItemModel.php:907Copy
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  • SELECT m.extension,m.item_id,m.table,m.name_column FROM j4_conditions_map as m WHERE m.condition_id = 18 ORDER BY m.extension,m.item_id156μs1KB/administrator/components/com_conditions/src/Model/ItemModel.php:907Copy
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