The last two decades of the 21st century have seen emerging zoonotic coronavirus(CoV)diseases,including severe acute respiratory syndrome(SARS)(Holmes 2003),Middle East respiratory syndrome(MERS)(Graham et al.,2013)an...The last two decades of the 21st century have seen emerging zoonotic coronavirus(CoV)diseases,including severe acute respiratory syndrome(SARS)(Holmes 2003),Middle East respiratory syndrome(MERS)(Graham et al.,2013)and coronavirus disease 2019(COVID-19)(Jiang et al.,2020).展开更多
The pebbling number of a graph G,f(G),is the least n such that,no matter how n pebbles are placed on the vertices of G,we can move a pebble to any vertex by a sequence of moves,each move taking two pebbles off one ver...The pebbling number of a graph G,f(G),is the least n such that,no matter how n pebbles are placed on the vertices of G,we can move a pebble to any vertex by a sequence of moves,each move taking two pebbles off one vertex and placing one on an adjacent vertex.Graham conjectured that for any connected graphs G and H,f(G×H)≤f(G)f(H).We show that Graham's conjecture holds true of a complete bipartite graph by a graph with the two-pebbling property.As a corollary,Graham's conjecture holds when G and H are complete bipartite graphs.展开更多
Purpose: During the last decade laparoscopic approach to perforated peptic ulcer has gained wide acceptance over the traditional open repair on the basis of being an equally efficient and less invasive technique. Meth...Purpose: During the last decade laparoscopic approach to perforated peptic ulcer has gained wide acceptance over the traditional open repair on the basis of being an equally efficient and less invasive technique. Methods: 198 patients with perforated duodenal or prepyloric ulcer that were surgically treated from 2003 to 2014 were included in this study. 140 were operated within 2 - 6 hours from the onset of symptoms, 55 within 6 - 24 hours, and 3 patients after 24 hours. Results: Laparoscopic simple closure with Graham patch was performed in 179 patients. In 19 patients with known chronic ulcer resistant to pharmacologic therapy, who were operated within 6 hours from the onset of symptoms, laparoscopic Taylor procedure was undertaken. Conversion to open repair was necessitated in four patients. The operating time was 40 - 100 min for the Graham patch repair and 120 - 155 min for the Taylor procedure. During follow-up, 48% of patients from the “Graham patch” group and no one from the “definitive procedure” group had recurrent ulcer. Conclusions: Laparoscopic treatment of perforated peptic ulcer is technically feasible and safe when performed by experienced surgeons. In certain cases more definitive procedures may achieve better long-term results.展开更多
The Wind in the Willows by Kenneth Grahame is a delightful tale that has caught the hearts of children and adults alike for over a century.For junior students,this book offers a magical journey into the lives of four ...The Wind in the Willows by Kenneth Grahame is a delightful tale that has caught the hearts of children and adults alike for over a century.For junior students,this book offers a magical journey into the lives of four anthropomorphic(拟人化的)animals—Mole,Rat,Toad,and Badger(鼹鼠、老鼠、蟾蜍和獾)—living in the idyllic(田园诗般的)English countryside.展开更多
1969年Graham和Oppenheimer将有着不同临床表现的“3种疾病”，即橄榄脑桥小脑萎缩、纹状体黑质变性和Shy—Dragger综合征，统称为多系统萎缩（multiple system atrophy，MSA）。命名的考虑一是三者临床症候有交叉重叠，二是临床诊断简...1969年Graham和Oppenheimer将有着不同临床表现的“3种疾病”，即橄榄脑桥小脑萎缩、纹状体黑质变性和Shy—Dragger综合征，统称为多系统萎缩（multiple system atrophy，MSA）。命名的考虑一是三者临床症候有交叉重叠，二是临床诊断简便。他们没想过MSA这个命名是“里程碑”式的定义。展开更多
Frankfurt am Main,May 2023.Eight months before the next Heimtextil,over 2,500 exhibitors are already planning to take part in January 2024-including top players such as A.S Création,Bedding House,Corn.van D...Frankfurt am Main,May 2023.Eight months before the next Heimtextil,over 2,500 exhibitors are already planning to take part in January 2024-including top players such as A.S Création,Bedding House,Corn.van Dijk,Elastron,Graham&Brown,JBY Creation,Lameirinho,Libeco Lagae,Masureel International,Marburger Tapetenfabrik,Traumina and Wendre.The home and household textile segments Asian Excellence and Asian Selection are also experiencing very high demand and are composed of a broad range of high-quality high-volume suppliers from Asia.展开更多
Chung defined a pebbling move on a graphG as the removal of two pebbles from one vertex and the addition of one pebble to an adjacent vertex. The pebbling number of a connected graphG, f(G), is the leastn such that an...Chung defined a pebbling move on a graphG as the removal of two pebbles from one vertex and the addition of one pebble to an adjacent vertex. The pebbling number of a connected graphG, f(G), is the leastn such that any distribution ofn pebbles onG allows one pebble to be moved to any specified but arbitrary vertex by a sequence of pebbling moves. Graham conjectured that for any connected graphsG andH, f(G xH) ≤ f(G)f(H). In the present paper the pebbling numbers of the product of two fan graphs and the product of two wheel graphs are computed. As a corollary, Graham’s conjecture holds whenG andH are fan graphs or wheel graphs.展开更多
基金This work was supported by the National Megaprojects of China for Major Infectious Diseases(2018ZX10301403 to L.L.)Program of Shanghai Academic/Technology Research Leader(20XD1420300 to L.L.)the National Natural Science Foundation of China(81822045 to L.L.,81630090 to S.J.).
文摘The last two decades of the 21st century have seen emerging zoonotic coronavirus(CoV)diseases,including severe acute respiratory syndrome(SARS)(Holmes 2003),Middle East respiratory syndrome(MERS)(Graham et al.,2013)and coronavirus disease 2019(COVID-19)(Jiang et al.,2020).
基金This work was supported by the National Natural Science Foundation of China (Grant Nos. 49873002, 10001005).
文摘The pebbling number of a graph G,f(G),is the least n such that,no matter how n pebbles are placed on the vertices of G,we can move a pebble to any vertex by a sequence of moves,each move taking two pebbles off one vertex and placing one on an adjacent vertex.Graham conjectured that for any connected graphs G and H,f(G×H)≤f(G)f(H).We show that Graham's conjecture holds true of a complete bipartite graph by a graph with the two-pebbling property.As a corollary,Graham's conjecture holds when G and H are complete bipartite graphs.
文摘Purpose: During the last decade laparoscopic approach to perforated peptic ulcer has gained wide acceptance over the traditional open repair on the basis of being an equally efficient and less invasive technique. Methods: 198 patients with perforated duodenal or prepyloric ulcer that were surgically treated from 2003 to 2014 were included in this study. 140 were operated within 2 - 6 hours from the onset of symptoms, 55 within 6 - 24 hours, and 3 patients after 24 hours. Results: Laparoscopic simple closure with Graham patch was performed in 179 patients. In 19 patients with known chronic ulcer resistant to pharmacologic therapy, who were operated within 6 hours from the onset of symptoms, laparoscopic Taylor procedure was undertaken. Conversion to open repair was necessitated in four patients. The operating time was 40 - 100 min for the Graham patch repair and 120 - 155 min for the Taylor procedure. During follow-up, 48% of patients from the “Graham patch” group and no one from the “definitive procedure” group had recurrent ulcer. Conclusions: Laparoscopic treatment of perforated peptic ulcer is technically feasible and safe when performed by experienced surgeons. In certain cases more definitive procedures may achieve better long-term results.
文摘The Wind in the Willows by Kenneth Grahame is a delightful tale that has caught the hearts of children and adults alike for over a century.For junior students,this book offers a magical journey into the lives of four anthropomorphic(拟人化的)animals—Mole,Rat,Toad,and Badger(鼹鼠、老鼠、蟾蜍和獾)—living in the idyllic(田园诗般的)English countryside.
文摘1969年Graham和Oppenheimer将有着不同临床表现的“3种疾病”，即橄榄脑桥小脑萎缩、纹状体黑质变性和Shy—Dragger综合征，统称为多系统萎缩（multiple system atrophy，MSA）。命名的考虑一是三者临床症候有交叉重叠，二是临床诊断简便。他们没想过MSA这个命名是“里程碑”式的定义。
文摘Frankfurt am Main,May 2023.Eight months before the next Heimtextil,over 2,500 exhibitors are already planning to take part in January 2024-including top players such as A.S Création,Bedding House,Corn.van Dijk,Elastron,Graham&Brown,JBY Creation,Lameirinho,Libeco Lagae,Masureel International,Marburger Tapetenfabrik,Traumina and Wendre.The home and household textile segments Asian Excellence and Asian Selection are also experiencing very high demand and are composed of a broad range of high-quality high-volume suppliers from Asia.
基金This work was supported by the National Natural Science Foundation of China(Grant No. 10001005) and by RFDP of China.
文摘Chung defined a pebbling move on a graphG as the removal of two pebbles from one vertex and the addition of one pebble to an adjacent vertex. The pebbling number of a connected graphG, f(G), is the leastn such that any distribution ofn pebbles onG allows one pebble to be moved to any specified but arbitrary vertex by a sequence of pebbling moves. Graham conjectured that for any connected graphsG andH, f(G xH) ≤ f(G)f(H). In the present paper the pebbling numbers of the product of two fan graphs and the product of two wheel graphs are computed. As a corollary, Graham’s conjecture holds whenG andH are fan graphs or wheel graphs.
