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| 1 | 从微孔洞起始的热冲击裂纹的数值研究——Ⅰ:热应力分析显示文摘陶瓷材料在热冲击荷载作用下的典型破坏模式是裂纹的起始和扩展。当高温的材料或构件突然处于低温环境时 ,裂纹将由材料或构件的表面开始产生和发展。因此 ,材料表面及其表面附近的材料微结构对裂纹的起始有着非常重要的影响。实验表明 :某些具有微孔洞结构的陶瓷材料比相应的密实材料的抗热冲击性能有所提高 ,但相关的机制目前还没有得到定量的解释。本文作者利用商业有限元软件 ABAQUS,分析了受热冲击表面上的开口微孔洞、处于表面附近的闭口微孔洞周围的热应力场 ,以及微孔洞的大小、微孔洞与表面的距离对热应力场的影响 ,其目的是为进一步分析裂纹的起始和扩展做准备。数值结果表明 :一般情况下 ,闭口微孔洞引起的应力集中比开口微孔洞引起的应力集中更为严重 ,特别当闭口微孔洞与表面之间的距离很小时 ,和没有微孔洞情况相比 ,闭口微孔洞引起的最大的应力集中系数超过 | 贺鹏飞 李京剑 Yuan C Stern R Clegg W J | 2002 | 复合材料学报2002，19，5： | 5 |
| 2 | Correlation of endoscopic disease severity with pediatric ulcerative colitis activity index score in children and young adults with ulcerative colitis显示文摘AIM To investigate of pediatric ulcerative colitis activity index(PUCAI) in ulcerative colitis correlate with mucosal inflammation and endoscopic assessment of disease activity(Mayo endoscopic score).METHODS We reviewed charts from ulcerative colitis patients who had undergone both colonoscopy over 3 years. Clinical assessment of disease severity within 35 d(either before or after) the colonoscopy were included. Patients were excluded if they had significant therapeutic interventions(such as the start of corticosteroids or immunosuppressive agents) between the colonoscopy and the clinical assessment. Mayoendoscopic score of the rectum and sigmoid were done by two gastroenterologists. Inter-observer variability in Mayo score was assessed.RESULTS We identified 99 patients(53% female, 74% pancolitis) that met inclusion criteria. The indications for colonoscopy included ongoing disease activity(62%), consideration of medication change(10%), assessment of medication efficacy(14%), and cancer screening(14%). Based on PUCAI scores, 33% of patients were in remission, 39% had mild disease, 23% had moderate disease, and 4% had severe disease. There was 'moderate-substantial' agreement between the two reviewers in assessing rectal Mayo scores(kappa = 0.54, 95%CI: 0.41-0.68). CONCLUSION Endoscopic disease severity(Mayo score) assessed by reviewing photographs of pediatric colonoscopy has moderate inter-rater reliability, and agreement was less robust in assessing patients with mild disease activity. Endoscopic disease severity generally correlates with clinical disease severity as measured by PUCAI score. However, children with inflamed colons can have significant variation in their reported clinical symptoms. Thus, assessment of both clinical symptoms and endoscopic disease severity may be required in future clinical studies. | Basavaraj Kerur Heather J Litman Julia Bender Stern Sarah Weber Jenifer R Lightdale Paul A Rufo Athos Bousvaros | 2017 | World Journal of Gastroenterology2017，23，18： | 5 |
| 3 | 从微孔洞起始的热冲击裂纹的数值研究——Ⅱ:能量释放率分析显示文摘利用商业的有限元软件 ABAQU S,分析了具有微孔洞结构氧化铝陶瓷材料在受到热冲击作用下 ,从处于材料表面上的开口微孔洞以及临近材料表面的闭口微孔洞的底部起始的裂纹扩展。结果表明 :对于从开口微孔洞和闭口微孔洞底部起始的裂纹 ,其能量释放率随冷却时间的变化规律类似 ,即随冷却时间 t由零开始增加 ,能量释放率也由零开始快速增大 ,在冷却时间大约为 t=0 .1s时 ,达到其最大值 ,随后开始降低。另外对于从开口微孔洞底部起始的裂纹 ,结果发现裂纹的能量释放率随裂纹长度的增加、微孔洞半径的增加而增加 ,而对于从闭口微孔洞底部起始的裂纹 ,其能量释放率随裂纹长度的增加、微孔洞半径的增加、以及微孔洞与材料受热冲击面距离的增加而增加。以开口微孔洞底部起始的裂纹为例 ,研究了裂纹与临近微孔洞之间的作用 ,发现临近微孔洞的存在可以明显减小裂纹的能量释放率。 | 贺鹏飞 李京剑 Yuan C Stern R Clegg W J | 2002 | 复合材料学报2002，19，5： | 2 |
| 4 | Dimethylni trosamine induced liver injury in rats:the early deposition of collagen显示文摘 | George J Rao KR Stern R | 2001 | Toxicology2001，，156： | 1 |
| 5 | Enriched back-arc basin basalts from the northern Mariana Trough:Implications for the magmatic evolution of back-arc basins显示文摘 | STERN R J LIN P MORRIS J D | 1990 | Earth and Planetary Science Letters1990，100，： | 1 |
| 6 | Mushrooms,Tumors, and Irnmunily 显示文摘 | Borchers A T Stern J S Hanckman R M | 1999 | Proceedings of the Society for Experimental Biology and Medicine1999，221，： | 1 |
| 7 | Mapping Gossans inArid Regions with Landsat TM and SIR-C Images:the BeddahoAlteration Zone in Northern Eritrea显示文摘 | Abdelsalam M G Stern R J Berhane W G | 2000 | Journal of African EarthSciences2000，30，4： | 1 |
| 8 | Research on teachers' pedagogical thoughts, judgments, decisions, and behavior显示文摘 | Shavelson R J and Stern P | 1981 | Review of Educational Reaearch1981，1981，51： | 1 |
| 9 | Mauritius' lychee fruitdevelopment and reduced abscission after treatment with the auxin2,4,5-TP显示文摘 | Stern R A Kigel J Tomer E | 1995 | JAmer Soc Hort Sci1995，120，1： | 1 |
| 10 | Stability measurements of 1 -stage implants in the edentulous mandi- ble by means of resonance frequency analysis 显示文摘 | Kessler- Liechti G Zix J Mericske- Stern R | 2008 | Int J Oral Maxillofac Implants2008，23，2： | 1 |
| 11 | Chemical and isotopic composition of lavas from the northern Mariana Trough:Implication for magmagenesis in back-arc basins显示文摘 | GRIBBLE R F STERN R J NEWMAN S | 1998 | Journal of Petrology1998，39，1： | 1 |
| 12 | Geochemistry, geochronology and petrology of Monte Mucrone: An example of Eo-alpine eclogitization of Permian granitoids in the Sesia-Lanzo zone, western Alps, Italy显示文摘 | Hunziker J C Martinotti G,Stern W B | 1985 | Chemical Geology1985，52，： | 1 |
| 13 | Studies on flaovr volatiles of some sweet corn products显示文摘 | Buttery R G Stern D J Ling L C | 1982 | Journal of Agricultural and Food Chemistry1982，30，： | 1 |
| 14 | Rapid detection of the F508 detection in Cystic Fibrosis by allele specific PCR and electrochemiluminescent detection 显示文摘 | STERN H J CARLOS R D SCHUTZBANK T E | 1995 | Clinical Biochemistry1995，28，： | 1 |
| 15 | Research on teachers' pedagogical thoughts,judgment, decisions and behavior显示文摘 | Shavelson R J Stern P | 1981 | Review of Educational Research1981，51，4： | 1 |
| 16 | MORB mantle and subduction components interact to generate baalts in the southern Mariana Trough back-arc basin显示文摘 | GRIBBLE R F STERN R J BLOOMER S H | 1996 | Geochimical et Cosmochimica Acta1996，60，12： | 1 |
| 17 | Happiness and time perspective as potential mediators of quality of life and depression in adolescent cancer显示文摘 | BITSKO M J STERN M DILLON R | 2008 | Pediatr Blood Cancer2008，50，3： | 1 |
| 18 | Physical volcanology of the submarine Mariana and volcano arcs显示文摘 | Bloomer S H Stern R J Smoot N C | 1989 | Bulletin of Volcanology1989，51，： | 1 |
| 19 | MORB mantal and subduction components interact to generate basalts in the southern Mariana Trough back-arc basin显示文摘 | Gribble R F Stern R J Bloomer S H | 1996 | Geochemica et Cosmochimica Acta1996，60，： | 1 |
| 20 | The prevalence of psoria- sis in African Americans:results from a population-based study 显示文摘 | Gelfand J M Stern R S Nijsten T | 2005 | J Am Acad Dermato12005，52，1： | 1 |
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