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中国近60年干旱热浪演变趋势及并发特征分析 被引量:7
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作者 廖国清 朱烨 +3 位作者 吴光东 王文 刘懿 朱玲玲 《长江科学院院报》 CSCD 北大核心 2023年第2期169-176,共8页
利用中国气象站1961—2017年降水、气温等资料,构建周尺度标准化帕尔默干旱指数,采用相对阈值法识别热浪过程,分析干旱和热浪的时空演变规律和并发特征,结果表明:(1)干旱和热浪频发于夏季,二者站次比年序列均呈先减(1995年前)后增的变... 利用中国气象站1961—2017年降水、气温等资料,构建周尺度标准化帕尔默干旱指数,采用相对阈值法识别热浪过程,分析干旱和热浪的时空演变规律和并发特征,结果表明:(1)干旱和热浪频发于夏季,二者站次比年序列均呈先减(1995年前)后增的变化趋势。(2)全国大部分地区热浪频次显著增加,东北、华北和云南东部的干旱频次显著增加。热浪频次突变年份主要为20世纪80—90年代,其空间分布与干旱较相似。(3)云南为复合型干旱热浪高发区,其次为东北、华北、广西和广东沿海,长江流域和新疆西北部的复合事件最少。(4)全国复合事件中约65%的热浪爆发于旱情开始及发展阶段,云南和长江中下游以南的热浪则出现在旱情恢复阶段。(5)除淮河流域和长江中下游外,复合型干旱热浪呈极显著增加趋势。研究成果可为应对极端天气气候事件和制定适应策略提供科学参考。 展开更多
关键词 干旱 热浪 时空分布 演变趋势 并发特征
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结肠息肉内镜摘除术后并发症发生特征及危险因素分析 被引量:12
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作者 田原 杨杰 +2 位作者 李红灵 蒋远健 宴芳 《遵义医学院学报》 2018年第1期58-62,共5页
目的分析结肠息肉内镜摘除术后并发症发生特征以及危险因素。方法选取贵州省人民医院2015年4月至2017年4月期间收治的378例拟行内镜摘除术治疗的结肠息肉患者,收集患者临床资料进行回顾性分析。根据并发症发生情况将患者分成并发症组与... 目的分析结肠息肉内镜摘除术后并发症发生特征以及危险因素。方法选取贵州省人民医院2015年4月至2017年4月期间收治的378例拟行内镜摘除术治疗的结肠息肉患者,收集患者临床资料进行回顾性分析。根据并发症发生情况将患者分成并发症组与无并发症组,分析患者的临床资料,探讨影响结肠息肉内镜摘除术后并发症发生的危险因素以及并发症的发生特征。结果 (1)并发症的类型主要有腹痛、出血、感染等,发生并发症24例,占6.35%;(2)并发症组与无并发症组患者在合并高血压、合并高血脂、息肉大小、息肉形态、息肉数量存在明显差异(P<0.05);(3)热活检钳咬除术、圈套器勒除术、APC、注射后高频电切除术、ESD/EMR、混合手术并发症发生率分别为1(3.23%)、6(16.67%)、1(1.64%)、1(0.63%)、2(6.67%)、13(36.11%),混合手术与圈套器勒除术并发症发生明显高于热活检钳咬除术、APC、注射后高频电切除术、ESD/EMR(P<0.05);(4)合并高血压、合并高血脂、息肉直径≥2.0 cm、息肉数量≥2个、有蒂息肉、混合手术是影响内镜摘除术后并发症发生的危险因素(P<0.05)。结论结肠息肉内镜摘除术后并发症以出血、腹痛与感染为主;而合并高血压、合并高血脂、息肉直径≥2.0 cm、息肉数量≥2个、有蒂息肉及手术方式与结肠息肉内镜摘除术后并发症发生有关,合适的手术方式可降低结肠息肉患者术后并发症的发生。 展开更多
关键词 结肠息肉内镜摘除术后 并发症发生特征 危险因素
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针对结肠息肉内镜摘除术后并发症发生特征及危险因素问题探讨 被引量:1
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作者 茹晓翠 《甘肃科技》 2021年第1期151-152,共2页
分析针对结肠息肉内镜摘除术后并发症发生特征及危险因素问题。选取甘肃省白银市第二人民医院2016年4月~2019年1月期间收治的结肠息肉内镜摘除手术治疗患者328例作为本文研究对象采取回顾性研究,根据患者是否出现并发症分为两组,并发症... 分析针对结肠息肉内镜摘除术后并发症发生特征及危险因素问题。选取甘肃省白银市第二人民医院2016年4月~2019年1月期间收治的结肠息肉内镜摘除手术治疗患者328例作为本文研究对象采取回顾性研究,根据患者是否出现并发症分为两组,并发症组和无并发症组。分析患者手术前息肉的大小、形状以及手术治疗方式和术后并发症等,分析患者的并发症出现特征以及危险因素。结果:并发症组患者主要症状为腹痛、出血、感染、穿孔等,且两组患者在合并高血压、合并高血脂、息肉大小、息肉形态、息肉数量方面对比具有差异,P<0.05表示统计学有意义。采取热活检钳钳除术、APC、圈套器套扎高频电切除术、EMR、ESD等治疗的并发症发病率之间对比具有差异,圈套器套扎高频电切除术、EMR、ESD的并发症高于其他手术,P<0.05表示统计学有意义。根据研究可知,患者合并高血压、合并高血脂,息肉直径在2cm以上,息肉数量超过2个以上,带蒂息肉,采取圈套器套扎高频电切除术、EMR、ESD都是患者治疗后并发症出现的危险因素。结肠息肉内镜摘除术治疗患者常见并发症为出血、腹痛、感染,影响患者手术后发生并发症的危险因素包括手术方式、息肉数量、是否存在蒂息肉、息肉直径、合并高血脂或高血压,医护人员要根据相关危险因素尽量降低术后并发症发病率,保证手术治疗的安全性。 展开更多
关键词 结肠息肉内镜摘除术 并发症发生特征 危险因素
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并发对象技术初探
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作者 瞿裕忠 沈军 +2 位作者 唐立中 朱海林 朱一清 《东南大学学报(自然科学版)》 EI CAS CSCD 1998年第6期84-89,共6页
在分析和比较典型的并发面向对象程序设计语言的基础上,提出了一个并发对象模型的架构.其特色在于对象的并发特征函数和对消息传递方式的处理.从语言设计的角度对并发对象模型与继承之间的有机集成进行了初步探讨.
关键词 并发对象技术 并发面向对象程序设计语言 并发对象模型 继承 并发特征函数
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Pancreatic sphincterotomy:Technique,indications,and complications 被引量:1
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作者 Jonathan M Buscaglia Anthony N Kalloo 《World Journal of Gastroenterology》 SCIE CAS CSCD 2007年第30期4064-4071,共8页
Pancreatic sphincterotomy serves as the cornerstone of endoscopic therapy of the pancreas. Historically, its indications have been less well-defined than those of endoscopic biliary sphincterotomy, yet it plays a defi... Pancreatic sphincterotomy serves as the cornerstone of endoscopic therapy of the pancreas. Historically, its indications have been less well-defined than those of endoscopic biliary sphincterotomy, yet it plays a definite and useful role in diseases such as chronic pancreatitis and pancreatic-type sphincter of Oddi dysfunction. In the appropriate setting, it may be used as a single therapeutic maneuver, or in conjunction with other endoscopic techniques such as pancreatic stone extraction or stent placement. The current standard of practice utilizes two different methods of performing pancreatic sphincterotomy: a pull-type sphincterotome technique without prior stent placement, and a needle-knife sphincterotome technique over an existing stent. The complications associated with pancreatic sphincterotomy are many, although acute pancreatitis appears to be the most common and the most serious of the early complications. As such, it continues to be reserved for those endoscopists who perform a relatively high-volume of therapeutic pancreaticobiliary endoscopic retrograde cholangio-pancreatography. 展开更多
关键词 PANCREAS SPHINCTEROTOMY Endoscopic TECHNIQUE INDICATIONS COMPLICATIONS
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Characterizing big data analytics workloads on POWER8 SMT processors
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作者 贾禛 Zhan Jianfeng +1 位作者 Wang Lei Zhang Lixin 《High Technology Letters》 EI CAS 2017年第3期245-251,共7页
Big data analytics is emerging as one kind of the most important workloads in modern data centers. Hence,it is of great interest to identify the method of achieving the best performance for big data analytics workload... Big data analytics is emerging as one kind of the most important workloads in modern data centers. Hence,it is of great interest to identify the method of achieving the best performance for big data analytics workloads running on state-of-the-art SMT( simultaneous multithreading) processors,which needs comprehensive understanding to workload characteristics. This paper chooses the Spark workloads as the representative big data analytics workloads and performs comprehensive measurements on the POWER8 platform,which supports a wide range of multithreading. The research finds that the thread assignment policy and cache contention have significant impacts on application performance. In order to identify the potential optimization method from the experiment results,this study performs micro-architecture level characterizations by means of hardware performance counters and gives implications accordingly. 展开更多
关键词 simultaneous multithreading(SMT) workloads characterization POWER8 big data analytics
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Leprosy without typical skin involvement but with concurrent tuberculosis: a case report
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作者 Liang Yingyin Li Xunhua +3 位作者 Tian Wei Chen Songlin Luo Diqing Ling Jian 《Journal of Medical Colleges of PLA(China)》 CAS 2010年第2期114-118,共5页
Leprosy is characterized by skin lesions and peripheral nerve damage. It may take a long time before the diagnosis can be confirmed if the patients have no typical skin involvements. Here we report an unusual case. A ... Leprosy is characterized by skin lesions and peripheral nerve damage. It may take a long time before the diagnosis can be confirmed if the patients have no typical skin involvements. Here we report an unusual case. A 40-year-old male with lepromatous leprosy showed a gradual onset of bilateral symmetrical neuropathies without characteristic skin manifestations seven years after onset and with pulmonary tuberculosis simultaneously. He was misdiagnosed as having Guillani-Barr6 syndrome and systemic necrotizing vasculitis for 10 years until the skin biopsy was performed. This case indicates that the risk of leprosy exists, though new cases being detected have significantly declined over the last 50 years; neurologists need to pay more attention to leprosy with various manifestations . 展开更多
关键词 LEPROSY Peripheral nerve lesions Type-2 lepra reaction Concurrent tuberculosis
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Enterolithiasis-associated ileus in Crohn's disease
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作者 Alexander Perathoner Pamela Kogler +3 位作者 Christian Denecke Johann Pratschke Reinhold Kafka-Ritsch Matthias Zitt 《World Journal of Gastroenterology》 SCIE CAS CSCD 2012年第42期6160-6163,共4页
Stasis of the flow of the intestinal contents,ingested material and unfavorable composition of the chylus can lead to the formation of enteroliths inside the bowel.Enterolithiasis represents a rare disorder of the gas... Stasis of the flow of the intestinal contents,ingested material and unfavorable composition of the chylus can lead to the formation of enteroliths inside the bowel.Enterolithiasis represents a rare disorder of the gastrointestinal tract that can be associated with intermittent abdominal pain or more serious complications such as bleeding or obstruction.Enterolithiasis in Crohn' s disease represents an extremely rare condition and usually occurs only in patients with a long symptomatic history of Crohn's disease.We report an unusual case of enterolithiasis-related intestinal obstruction in a young male patient with Crohn's disease(A2L3B1 Montreal Classification for Crohn's disease 2005) undergoing emergency laparotomy and ileocoecal resection.In addition,we present an overview of the relevant characteristics of enterolithiasis on the basis of the corresponding literature. 展开更多
关键词 Crohn's disease Enterolithiasis ILEUS Inflammatory bowel disease OBSTRUCTION
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Total hip arthroplasty for posttraumatic osteoarthritis following acetabular fracture: A systematic review of characteristics, outcomes, and complications 被引量:30
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作者 Robert D. Stibolt Jr. Harshadkumar A. Patel +3 位作者 Samuel R. Huntley Eva J. Lehtonen Ashish B. Shah Sameer M. Naranje 《Chinese Journal of Traumatology》 CAS CSCD 2018年第3期176-181,共6页
Purpose: Posttraumatic arthritis (PTA) may develop years after acetabular fracture, hindering joint function and causing significant chronic musculoskeletal pain. Given the delayed onset of PTA, few studies have as... Purpose: Posttraumatic arthritis (PTA) may develop years after acetabular fracture, hindering joint function and causing significant chronic musculoskeletal pain. Given the delayed onset of PTA, few studies have assessed outcomes of delayed total hip arthroplasty (THA) in acetabular fracture patients. This study systematically reviewed the literature for outcomes of THA in patients with PTA and prior acetabular fracture. Methods: Pubmed, EMBASE, SCOPUS, and Cochrane library were searched for articles containing the keywords "acetabular", "fracture", "arthroplasty", and "post traumatic arthritis" published between 1995 and August 2017. Studies with less than 10 patients, less than 2 years of follow-up, conference abstracts, and non-English language articles were excluded. Data on patient demographics, surgical characteristics, and outcomes of delayed THA, including implant survival, complications, need for revision, and functional scores, was collected from eligible studies. Results: With 1830 studies were screened and data from 10 studies with 448 patients were included in this review, The median patient age on date of THA was 51.5 years, ranging from 19 to 90 years. The median time from fracture to THA was 37 months, with a range of 27-74 months. Mean follow-up times ranged from 4 to 20 years, The mean Harris hip scores (HHS) improved from 41.5 pre-operatively, to 87.6 post-operatively, The most prevalent postoperative complications were heterotopic ossification (28% -63%), implant loosening (1%-24%), and infection (0%-16%). The minimum 5-year survival of implants ranged from 70% to 100%. Revision rates ranged from 2% to 32%. Conclusion: Despite the difficulties associated with performing THA in patients with PTA from previous acetabular fracture (including soft tissue scarring, existing hardware, and acetabular bone loss) and the relatively high complication rates, THA in patients with VIA following prior acetabular fracture leads to significant improvement in pain and function at 10-year follow-up. Further high quality randomized controlled studies are needed to confirm the outcomes after delayed THA in these patients. 展开更多
关键词 Total hip arthroplasty Posttraumatic arthritis Acetabular fractures Post-operative complications Heterotopic ossification Delayed total hip arthroplasty
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Comparative analysis of the characteristics of global seismic wave propagation excited by the M_w 9.0 Tohoku earthquake using numerical simulation 被引量:4
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作者 YAN ZhenZhen ZHANG Huai +1 位作者 FAN XiangTao DU XiaoPing 《Science China Earth Sciences》 SCIE EI CAS 2014年第7期1626-1636,共11页
Giant earthquakes generate rich signals that can be used to explore the characteristics of the hierarchical structure of the Earth’s interior associated with the eigenfrequencies of the Earth.We employ the spectral e... Giant earthquakes generate rich signals that can be used to explore the characteristics of the hierarchical structure of the Earth’s interior associated with the eigenfrequencies of the Earth.We employ the spectral element method,incorporated with large-scale parallel computing technology,to investigate the characteristics of global seismic wave propagation excited by the2011 Mw9.0 Tohoku earthquake.The transversely isotropic PREM model is employed as a prototype of our numerical global Earth model.Topographic data and the effect of the oceans are taken into consideration.Wave propagation processes are simulated by solving three-dimensional elastic wave governing equations with the seismic moment tensor obtained from the Global Centroid Moment Tensor Catalog.Three-dimensional visualization of our computing results displays the nature of the global seismic wave propagation.Comparative analysis of our calculations with observations obtained from the Incorporated Research Institutions for Seismology demonstrates the reliability and feasibility of our numerical results.We compare synthetic seismograms with incorporated and unincorporated ocean models.First results show that the oceans have obvious effects on the characteristics of seismic wave propagation.The peak displacement and peak velocity of P waves become relatively small under the effect of the ocean.However,the effect of the ocean on S-waves is complex.The displacement and velocity of S waves decrease rapidly over time using an unincorporated ocean model.Therefore,the effects of the ocean should be incorporated when undertaking quantitative earthquake hazard assessments on coastal areas.In addition,we undertake comparative analysis on the characteristics of the Earth’s oscillation excited by the 2004 Sumatra-Andaman,2008 Wenchuan,and 2011Tohoku earthquakes that incorporate the effect of the Earth’s gravitational potential.A comparison of the amplitude spectra of the numerical records indicates that energy released by the three big earthquakes is different.Our comparative analysis realizes that the computing results can accurately reproduce some eigenfrequencies of the Earth,such as toroidal modes 0T2 to 0T13and spheroidal modes 0S7 to 0S31.These results demonstrate that numerical simulations can be successfully used to investigate the Earth’s oscillations.We propose that numerical simulations can be used as one of the major tools to further reveal how the Earth’s lateral heterogeneities affect the Earth’s oscillations. 展开更多
关键词 Mw9.0 Tohoku earthquake Sea of Japan numerical simulation global seismic wave propagation Earth's oscillations
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