The basic approach of protecting people from being hurt or killed in an accident is to improve crashworthiness of vehicles. This paper starts with discussing theories and methods for vehicle passive safety design, which included experiential methods, analytic methods, multi-body dynamics methods, crash test methods and the finite element method. Emphasis will be paid to the basic FEM theories and algorithms of impact problems. Topics discussed include the governing equation, element discretization, hourglass control, time integration, material model, shell element algorithms and contact-impact algorithms. For more reliable simulation results, this paper then conducts study on how to accurately get material model parameters by combining the FEM method with experimental method, and develops relevant material test machine and parameter calculating software. Based on that, basic typical impact simulation and test validation study are conducted. On the basis of the above work, the paper studies the thin-shell structures'crashworthiness, which was affected by the following factors: spot-weld features, shell thickness, cross-section and pre-deformation. As to vehicle parts'crashworthiness, the paper conducts simulation study of designing energy-absorbing steering system and adaptive airbag system. A practical energy-absorbing steering wheel is designed as an example. In further depth research, the paper suggests several inverse quantificational methods for vehicle crashworthiness design based on the ideal crash characteristics. The above theories and methods are applied with good results through several practical vehicles' crashworthiness design and improvement.

文中對(duì)汽車碰撞安全性的設(shè)計(jì)理論和方法進(jìn)行了歸類和總結(jié)日韩性色自拍视频网站，其中包括經(jīng)驗(yàn)法、解析法日韩六九视频无码中文、多剛體動(dòng)力學(xué)法欧美老妇激情BBW、試驗(yàn)法以及有限元方法等；重點(diǎn)介紹了碰撞有限元法的基本理論和有關(guān)算法日本性交网站，涉及到有限元求解控制方程公妇A中文在线观看、單元離散、沙漏模態(tài)控制精品久久久久久无码中文版、時(shí)間積分狼友无码、材料模型和應(yīng)力修正、薄殼單元算法以及接觸碰撞界面算法等五月天色色综合，探討了有限元計(jì)算中的材料模型參數(shù)獲取技術(shù)又粗又大的欧美影院，開(kāi)發(fā)了相應(yīng)的材料試驗(yàn)裝置及材料模型參數(shù)反求軟件，在此基礎(chǔ)上進(jìn)行了基本的碰撞仿真算例和試驗(yàn)對(duì)比研究国产AV一区二区三区天堂；文中通過(guò)應(yīng)用有限元方法研究了薄壁構(gòu)件的碰撞吸能特性女生高潮喷水的视频，指出了設(shè)計(jì)薄壁吸能構(gòu)件時(shí)需要考慮的幾個(gè)主要影響因素，即焊點(diǎn)一区偷窥视频、壁厚70岁熟女熟妇伦Av网站、橫截面和預(yù)變形等；在關(guān)于車輛部件的碰撞安全性能設(shè)計(jì)中進(jìn)行了吸能轉(zhuǎn)向機(jī)構(gòu)和自適應(yīng)安全氣囊的仿真研究欧美亚洲日韩，提出了吸能轉(zhuǎn)向機(jī)構(gòu)和自適應(yīng)安全氣囊的仿真研究方法人人人爽人人做人人看视频；文中最后探討了整車碰撞性能的設(shè)計(jì)與改進(jìn)方法亚洲国产天堂在线观看，提出了以理想碰撞特性為目標(biāo)91天天在线精品国产，采用分段加速度或者根據(jù)碰撞時(shí)間進(jìn)行設(shè)計(jì)的反推設(shè)計(jì)法国内在线手机自拍视频、部件吸能仿真優(yōu)化設(shè)計(jì)法等量化設(shè)計(jì)方法，并通過(guò)綜合應(yīng)用文中所討論的相關(guān)技術(shù)進(jìn)行了整車碰撞性能的設(shè)計(jì)與改進(jìn)實(shí)例研究中文字幕一级毛片在线看，所選定的車型是大眾化的普通轎車和碰撞安全性基礎(chǔ)較差的微型面包車一级做a爰片久久毛片A片app，研究結(jié)果表明，本文所提出的設(shè)計(jì)與改進(jìn)方法是適用而有效的XXXx欧美老妇，具有重要的工程實(shí)用意義和價(jià)值国产黄色A片在线观看。

Methods Twenty-Five cases of functional crossbite of transtional dentition,18 male cases and 7 female cases.

方法選擇25例替牙期反牙合的患者。男18例中文字幕丝袜综合第二页，女7例中文无码视频h，平均年齡10.5歲。

Methods: Standard esophageal manometry was performed in 300 patients with typical gastroesophageal reflux symptoms, including 196 NERD and 104 RE, and in 83 healthy volunteers.

83例健康志愿者以及具有典型胃食管反流癥狀的NERD患者196例和RE患者104例納入本研究人人入人人干人人爱爱爱爱爱。

Result The contour of bilateral kidney,renal pelvis and calices and ureters were showed clearly with digital laminography.19 cases showed normal.55 cases showed renal or ureteral calculus,ureterohydronephrosis.16 cases were chronic pyelonephritis,renal atrophy or renal tum...

結(jié)果運(yùn)用數(shù)字化成像體層攝影能較好顯示雙腎輪廓美女自慰网页，腎盂、腎盞及雙側(cè)輸尿管我想看黄色一级中国男人操男人，不單能較好顯示腎結(jié)石午夜爱爱精品无码、輸尿管結(jié)石，對(duì)慢性腎盂腎炎日韩午夜在线试看网站视频、腎萎縮等腎內(nèi)科腎病顯示清楚黄色毛片在线观看视频了，19例顯影正常，腎結(jié)石及輸尿管結(jié)石黄片一区二区三级，腎積液及輸尿管積液共55例国产色一区，慢性腎盂腎炎、反流性腎病所致的腎瘢痕日韩欧美亚洲综合一区二区三区、腎萎縮国产盗摄视频精品一区二区、腎腫瘤等內(nèi)科腎病16例。

Result: All of them with satisfied nutrion,There's no compliication resulted from nursing,and no diarrhea or enterospasm.

結(jié)果：6例出現(xiàn)反酸在线欧美看片免费人成视频，4例出現(xiàn)腹脹国产日韩亚洲丝袜AV，無(wú)一例發(fā)生腹瀉、腸痙攣等嚴(yán)重營(yíng)養(yǎng)相關(guān)并發(fā)癥乱子刺激对白在线播放。

Methods 92 patients with GERD were randomly divided into the treated group with Danzhi Xiaoyao pill and hydrotalcite and the control group with hydrotalcite only.

方法92例胃食管反流病患者隨機(jī)分為丹梔逍遙丸聯(lián)合鋁碳酸鎂治療組(46例)及鋁碳酸鎂對(duì)照組(46例)97视频在线分类播放。

Methods:124 outpatients of vaginitis were choosed,69 cases with badness by long-treatment or recrudescent as the observation group and 55 cases with first catch the disease as the control group.

門診外陰陰道念珠菌病的患者共 12 4例，6 9例久治不愈或反復(fù)發(fā)作者為觀察組iGao中文视频网为爱搞点激情，5 5例初染者為對(duì)照組国产福利网在线。

The patients were treated with reversal flow axial composite auricular island flap based on supraorbital artery or supratrochlear artery.results6 cases were treated with the technique, only one case underwent epidermal blisterand, and the partial skin flap necrosis, the necrosis area of flap was 1.0cm×2.0cm, 5 cases were successfully repaired with satisfactory.conclusionthe island flap could be an ideal way for the one stage reconstruction of large alar defects, which is recommended to be widely used.

結(jié)果：在臨床上將該方法應(yīng)用于6例病人，除1例出現(xiàn)表皮水皰久久久亚洲天堂，后皮瓣部分壞死gogo全球高清国模私拍，面積約1.0 cm×2.0，其余5例取得滿意的臨床效果思思久久成年人免费视频。結(jié)論：反流軸型的耳廓復(fù)合組織瓣能ⅰ期修復(fù)大面積鼻翼缺損强奸高潮视频，是一項(xiàng)極具推廣的修復(fù)手段欧美日韩性爱视频一区。

The RT-PCR of coronas has v, as positive in three (18.8%) of sixteen throat swabs and in none (0%) of seven rectal swabs.

冠狀病毒RNA是用反錄型的聚合多鏈反應(yīng)酶來(lái)檢測(cè)，共偵測(cè)喉頭檢體十六例黄色网站视频能看，血清檢體二例及肛門檢體七例免费A片在线观看线上。

Methods:Two hundred patients with GERD suffered from asthma attack were reviewed retrospectively who had been treated by the stretta radiofrequency treatment under endoscope with intravenous anesthesia(100 cases) and LNF with general anesthesia(100 cases) from January 2008 to December...

對(duì)2008-01/2008-12 200例胃食管反流患者在靜脈麻醉下行經(jīng)食管射頻治療術(shù)(100例)和在全麻下腹腔鏡胃底折疊術(shù)(100例)中的&哮喘&發(fā)作患者的處理進(jìn)行總結(jié)。