【正文】 學(xué) 號：xxxxHEBEI UNITED UNIVERSITY畢 業(yè) 論 文GRADUATE THESIS設(shè)計題目：焦?fàn)t煤氣管道腐蝕機(jī)理研究及在線監(jiān)測系統(tǒng)設(shè)計學(xué)生姓名：xxxxx專業(yè)班級：xxxxxxx學(xué) 院：機(jī)械工程學(xué)院指導(dǎo)教師：xxxx2022 年 05 月 23 日摘 要以網(wǎng)絡(luò)為載體的青少年違法犯罪屢有發(fā)生，并呈逐年上升之勢。類型也多種多樣。網(wǎng)絡(luò)是新時代的產(chǎn)物，青少年是祖國的未來，民族的希望。青少年處在不穩(wěn)定的時期，很容易走上網(wǎng)絡(luò)犯罪的道路。青少年的成長關(guān)系到國家將來的繁榮和發(fā)展。網(wǎng)絡(luò)犯罪是一種新型的犯罪活動，這類犯罪的隱蔽性和危害性較之傳統(tǒng)意義上的犯罪更大。青少年成為網(wǎng)絡(luò)犯罪的主力軍，這使得犯罪人口的年齡前移，從而加劇了社會環(huán)境的不穩(wěn)定性。因此，加強(qiáng)對青少年網(wǎng)絡(luò)犯罪現(xiàn)象的研究，采取有效的防控措施，具有十分重要的社會意義。本文共五部分。第一部分寫了民間借貸的研究背景，研究意義，青少年網(wǎng)絡(luò)犯罪的概念和研究方法。第二部分寫了民間借貸的研究背景和研究意義。第三部分寫了青少年網(wǎng)絡(luò)犯罪類型及特點(diǎn)。第四部分寫了網(wǎng)絡(luò)對青少年的影響。第五部分寫了我國青少年犯罪的成因關(guān)于遏制青少年網(wǎng)絡(luò)犯罪的具體措施。最后一部分是總結(jié)關(guān)鍵詞 青少年；網(wǎng)絡(luò)犯罪；對策I / 35AbstractTo the work as the carrier of juvenile delinquency has happened repeatedly, and showed an upward trend. Various types of. The work is the product of the new era, young people are the future of the motherland, the hope of the nation. Youth in the period of instability, easy to go on the work crime. The growth of adolescents in relation to the prosperity and development of the national future. Network crime is a new crime, the crime of concealment and hazard than the traditional sense of the crime more. Young people to bee the main force of work crime, the crime of population age advancement, which exacerbated the instability of the social environment. Therefore, strengthening the research on the phenomenon of juvenile cyber crime, take effective prevention and control measures, has important social significance.This paper consists of five parts. The first part of the study background, wrote borrowing the research significance, concepts and research methods of juvenile cyber crime. The second part write the research background and research significance of folk lending. The third part write the types and characteristics of juvenile cyber crime. The fourth part of the influence on the youth. The specific measures wrote the fifth part of the causes of juvenile delinquency in China about the containment of juvenile cyber crime. The last part is the summar.Keywords Adolescent。 work crime。 countermeasure 目 錄畢 業(yè) 論 文 ...............................................................................................IGRADUATE THESIS ..................................................................................................I設(shè)計題目：焦?fàn)t煤氣管道腐蝕機(jī)理研究及在線監(jiān)測系統(tǒng)設(shè)計 .................................I學(xué)生姓名：張福強(qiáng) .........................................................................................................I2022 年 05 月 23 日 ........................................................................................................I摘 要 .............................................................................................................................IABSTRACT .......................................................................................................................II第 1 章 緒論 ..................................................................................................................1 研究背景 ................................................................................................................................1 研究意義 ................................................................................................................................1 相關(guān)問題的研究 ....................................................................................................................2 對焦?fàn)t煤氣管道腐蝕的原因及檢測 ....................................................................................3第 2 章 焦?fàn)t煤氣的腐蝕機(jī)理 ......................................................................................6 焦?fàn)t煤氣管道的腐蝕種類及原理 ........................................................................................6 焦?fàn)t煤氣管道腐蝕的影響因素及自身抵抗因素 ................................................................6 焦?fàn)t煤氣管道腐蝕的物理或化學(xué)變化反應(yīng)過程 ................................................................8第 3 章 焦?fàn)t煤氣管道剩余壁厚的管內(nèi)的檢測方法 ................................................10第 4 章 焦?fàn)t煤氣管道腐蝕連續(xù)檢測的具體實(shí)施方案 ............................................................14 超聲波檢測技術(shù) ..................................................................................................................14第五章 超聲波檢測方案設(shè)計 ....................................................................................................17 超聲波探頭的選擇 ..............................................................................................................17 本章小結(jié) ............................................................................................................................26結(jié) 論 ..........................................................................................................................27參考文獻(xiàn) ......................................................................................................................28