【正文】 2）磨損試驗過程中，尤其是鋼絲環(huán)摩擦時不能每次保證鋼絲是新纏繞上去的，這對摩擦實驗數(shù)據(jù)的準確性存在一定影響。 河南科技大學畢業(yè)論文 25 25 參考文獻 [1] SuckChoon Kang ， Daewonchung. The synthesis and frictional properties of lubricantimpregnated cast nylons[J]. wear,2021,239,244250 [2] 王有槐，王新華，朱培．鑄型尼龍實用技術 [M]．北京：中國石化出版社，1994： l200 [3] (日 )福本修編，施祖培譯 .聚酰胺樹脂手冊 [M].第一版．北京：中國石化出版社， 1994 [4] 樊新民，車劍飛．工程塑料及其應用 [M]．北京：機械工業(yè)出版社， 2021 [5] 楊柳青．沸石分子篩改性尼龍的研究 [D]．山西：太原理工大學， 2021 [6] ， ， 方征平，沈烈譯 .高分子復合材料加工工程 .北京：化學工業(yè)出版社 ,2021,89 河南科技大學畢業(yè)論文 26 26 [7] 孫向 東 ， 田 桂芝 ， 張 建 中 .甲醇 鈉 催 化 制 取 MC尼龍 .工 程 塑料 應 用 , 2021,(12),2426 [8] 孫向東，孫旭東，張慧波． MC尼龍改性研究進展 [J]．工程塑料應用， 2021，31(2),5961 [9] 黃銳 .塑料工程手冊 [M].北京 :機械工業(yè)出版社 ,2021. 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[25] 劉家浚 .材料磨損原理及其耐磨性 [M].北京 :清華大學出版社 ,1993. 河南科技大學畢業(yè)論文 28 28 致謝 經(jīng)過三 個多月的忙碌和工作，本次畢業(yè)設計已經(jīng)接近尾聲，作為一個本科生的畢業(yè)設計，由于經(jīng)驗的匱乏，難免有許多考慮不周全的地方，如果沒有導師的督促指導，以及一起工作的同學們的支持，想要完成這個設計是難以想象的。 在這里首先要感謝我的導師潘老師。潘老師平日里工作繁多，但在我做畢業(yè)設計的每個階段，從實驗著手到查閱資料，試驗方法的確定和修改，中期檢查，后期詳細性能測試，寫論文等整個過程中都給予了我悉心的指導。我的實驗較為復雜煩瑣，但是潘老師仍然細心地糾正實驗中的錯誤。除了敬佩潘老師的專業(yè)水平外，他的治學嚴謹和科學研究的精神 也是我永遠學習的榜樣，并將積極影響我今后的學習和工作。此外，李寧學長也給了我很大幫助，在此提出感謝。 其次要感謝和我一起作畢業(yè)設計的陳夢偉同學、程強同學、喬冉冉同學、李晨亞同學、王文華同學、張安同同學，在我做畢業(yè)設計過程中他們給予了我很大的幫助，尤其是陳夢偉 同學，在我做實驗及撰寫論文的過程中給予我莫大的幫助，特此提出感謝。 然后還要感謝大學四年來所有的老師，為我們打下化工專業(yè)知識的基礎；同時還要感謝所有的同學們，正是因為有了你們的支持和鼓勵。此次畢河南科技大學畢業(yè)論文 29 29 業(yè)設計才會順利完成。 最后感謝化工學院和我的母校 — 河南科 技大學大學四年來對我的大力栽培。 河南科技大學畢業(yè)論文 30 30 a 您好，為你提供優(yōu)秀的畢業(yè)論文參考資料，請您刪除以下內容， O(∩_∩)O 謝謝?。。 nati onal survey was recentl y l aunched to eval uate the eye heal th of Chi nese chi l dren a June 6, Chi na39。s annual Nati onal Day for Eye Care, the Chi na Youth Devel opment Servi ceCenter and Zheji ang Medi ci ne, a l eadi ng l i sted Chi nese pharmaceuti cal pany, joi ntl yannounced the ki ckoff of the about one month, a questi onnaire pi l ed by top eye care medi cal experts in Chi na wi l lbe di stri buted through mul ti ple onl i ne partners, i ncl udi ng Heal , as wel l asthrough offl i ne survey events held in uni versi ti es, mi ddl e school s and pri mary school s acrossthe report wi l l be rel eased based on the survey stati sti cs and anal ysi s, and most i mportantl y,gui del i nes for parents and youth on how to care for the eyes and prevent myopi a — agrowi ng probl em in Chi na39。s di gi ti zed soci ety, wi l l al so be attached on the report.Myopi a is not onl y a disease that makes peopl e see thi ngs bl urri l y, but al so l eads to severepl i cati ons, such as gl aua (i ncreased pressure wi thi n the eyebal l ), and can causebl i ndness, sai d Zhou Yuehua, an establ i shed eye care speci al i st wi th Bei ji ng TongrenHospi tal .It is very i mportant for parents and chi l dren to know about the ri sk and care for thei r eyes.There are about 450 mi l l i on myopi a pati ents in Chi na. Among Chi nese myopi a pati ents,30mi l l i on are severe pati ents, accordi ng to ZhouThe preval ence of myopi a among hi gh school and col l ege students is more than 70 percent,and the si tuati on is conti nuousl y worseni ng, he Zhu, di rector wi th the Chi na Youth Devel opment Servi ce Center, sai d l ong hours ofstudy, l ack of exerci se, especi al l y outdoor acti vi ti es, and attachment to el ectroni c screen aresome of the top reasons behi nd the wi despread myopi a probl ems, and the i ncrease ofyounger pati ents, al though Chi na has made great progress in i mprovi ng the hardwarefaci l i ti es and l i ghti ng condi ti ons in school sai d he hopes the survey wi l l al ert peopl e on the threateni ng si tuati on, and al so hel pmedi cal experts to better gui del i ne parents and chi l dren39。s behavi ors to care for eyes, basedon the ti mel y and factual stati sti cs the survey col l seri es of fol l owup events wi l l al so be hel d in si x ci ti es, i ncl udi ng Ji nan in Shandongprovi nce, and Changsha in Hunan provi nce, to educate peopl e on how to care for eyes afterthe survey started. More and more Chi nese are joggi ng to get and stay fi t. Most joggers wi l l run al one, but some wi l l jog wi th fri ends or even coaches. The Bei ji ng Ol ympi c Forest Park i s one of the most popul ar spots. It i s packed wi th runners i n the afternoon, usual l y after work, and at weekends. Joggi ng after a whol e day39。s work can be a way to unwi nd. It i s true for He Wenjun, whose workpl ace i s ri ght near the forest park. She di scovered her athl eti c apti tude at the age of seven, when she began pl ayi ng tenni s. The n she t urne d to joggi ng, and s he has persevered wi th i t for 10 ye ars. I e to jog al most every day after work, whenever I have ti me. I thi nk joggi ng i s good for my heal th. And for me, a gi rl , i t hel ps me to ac hi eve to eternal goal , to keep sl i m, He sai d. He says she prefers joggi ng al one, so she can focus better. She l oves joggi ng, even duri ng Bei ji ng39。s smoggy days. If the smog i s severe, I39。l l hol d off joggi ng for a w hi l e. But i f I real l y want to get away