检索结果-南通市图书馆

Pseudo-random sequence generator based on the generalized Henon map

在线全文

学校读者我要写书评

暂无评论

The Journal of China Universities of Posts and Telecommunications 2008年第3期15卷 64-68页

作者： ZHENG Fan TIAN Xiao-jian SONG jing-yi LI xue-yan College of Electronic Science and Engineering Jilin University Changchun 130012 China

By analysis and comparison of several chaotic systems that are applied to generate pseudo-random sequence, the generalized Henon map is proposed as a pseudo-random sequence generator. A new algorithm is created to solve the problem of non-uniform distribution of the sequence generated by the generalized Henon map. First, move the decimal point of elements in the sequence to the fight; then, cut off the integer; and finally, quantify it into a binary sequence. Statistical test, security analysis, and the application of image encryption have strongly supported the good random statistical characteristics, high linear complexity, large key space, and great sensitivity of the binary sequence.

关键词： pseudo-random sequence chaos the generalized Henon map

Removal of refractory thrombus by 5F child catheter in patients with subacute myocardial infarction

在线全文

学校读者我要写书评

暂无评论

Journal of Geriatric Cardiology 2019年第2期16卷 168-172页

作者： Li SHENG Jian-Qiang LI Dang-Hui SUN Yong-Tai GONG jing-yi xue Yue LI Department of Cardiology the First Affiliated Hospital of Harbin Medical University

No-reflow phenomenon is common in patients with acute coronary syndrome(ACS)after percutaneous coronary intervention(PCI),and it is strongly associated with adverse clinical *** studies have shown that heavy thrombus burden could predict the development of no-reflow in *** and mechanical thrombus aspiration catheters are widely used;however,there is still residual refractory thrombus left after the routine use of thrombectomy,especially in patients with subacute myocardial infarction(SMI).In our practice,child catheter aspiration has been used as a safe and effective approach to solve the residual thrombus in SMI *** described this technique in detail by a series of cases.

关键词： Percutaneous coronary intervention Refractory thrombus Subacute myocardial infarction Thrombus aspiration

在线全文

学校读者我要写书评

暂无评论

哈尔滨市区雾的特征分析及预报指标研究

自然灾害学报 2005年第2期14卷 47-49页

作者：景学义张雪梅兰博文哈尔滨市气象局黑龙江哈尔滨150080

利用哈尔滨市1954-2003年天气现象地面观测资料中雾的记录,分析了哈尔滨市区雾发生的年际、月际和日变化规律,总结出了雾发生的气象要素、天气分型和预报指标。

关键词：辐射雾分型预报指标

Presence of Severe Stenosis in Most Culprit Lesions of Patients with ST-segment Elevation Myocardial Infarction

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2016年第17期129卷 2074-2078页

作者： Li Sheng Shuang Li Jian-Qiang Li jing-yi xue Yan-Ming Sun Yong-Tai Gong Ling jing Dang-Hui Sun Wei-Min Li Ding-Yu Wang Yue Li Department of Cardiology The First Affiliated Hospital of Harbin Medical University Harbin Medical University Harbin Heilongjiang 150001 China Postgraduate Institute Harbin Medical University Harbin Heilongjiang 150081 China

Background： Previous studies revealed that culprit vessels of ST-segment elevation myocardial infarction （STEMI） were often related to mild or moderate stenosis. However, recent studies suggested that severe stenosis was primarily found in culprit lesions. The objective of this study was to analyze the stenosis severity of culprit lesions in STEMI patients and to clarity the paradoxical results. Methods： A total of 489 consecutive STEMI patients who underwent primary percutaneous coronary intervention were retrospectively studied from January 2012 to December 2014. The patients were divided into three groups based on stenosis severity using quantitative coronary analysis： Group A, 314 cases, stenosis 〉70%： Group B, 127 cases, stenosis 50-70%： and Group C, 48 cases, stenosis 〈_50%,. The clinical, demographic, and angiographic data of all groups were analyzed. Results： Patients in Group A exhibited a significantly higher prevalence of history of angina pectoris （95.9% vs. 62.5%, P 〈 0.001 ）, inultivessel disease （73.2% vs. 54.2%, P = 0.007）, and lower cardiac ejection ITaction （53.3 ± 8.6 vs. 56.8 ± 8.4, P = 0.009） than those in Group C. Multivariable analysis revealed that history of angina pectoris （odds ratio [OR]： 13.89, 95% confidence interval [（7]： 6.21-31.11 ） and multivessel disease （OR： 2.32, 95%, CI： 1.25-4.31 ） were correlated with severe stenosis of the culprit lesion in Group A. Conclusions： Most culprit lesions in STEM[ patients were severe stenosis. These patients exhibited a higher prevalence of angina history and multivessel diseases.

关键词： Percutaneous Coronary Intervention Quantitative Coronary Angiography ST-segment Elevation Myocardial Infarction

基于求积组局部细化技术的S_N屏蔽计算方法

在线全文

学校读者我要写书评

暂无评论

原子能科学技术 2017年第8期51卷 1451-1458页

作者：刘聪张斌李晓静陈义学华北电力大学核科学与工程学院北京102206 中国核电工程有限公司北京100840

辐射屏蔽设计是保证核装置安全性的重要组成部分,离散纵标法是屏蔽计算的主要方法之一。在具有狭长孔道的屏蔽问题中,由于中子角通量密度呈强各向异性分布,特别在孔道内其分布存在极大峰值,传统求积组难以实现计算精度与效率之间的平衡... 详细信息

辐射屏蔽设计是保证核装置安全性的重要组成部分,离散纵标法是屏蔽计算的主要方法之一。在具有狭长孔道的屏蔽问题中,由于中子角通量密度呈强各向异性分布,特别在孔道内其分布存在极大峰值,传统求积组难以实现计算精度与效率之间的平衡。为此,本文基于勒让德-切比雪夫求积组的离散特点,研究局部范围内多层极角细化技术,提高求积组积分角通量密度的精度。在极角细化的基础上,进一步研究偏倚求积组以提高计算效率,并开展相关收敛分析。对国际权威基准题Kobayashi的测试分析表明,极角细化技术可有效提高带有孔道屏蔽问题的计算精度。

关键词：屏蔽计算离散纵标法极角细化技术 P_NT_N求积组

在线全文

学校读者我要写书评

暂无评论

磨盘山水库流域集水期降水等级预报

自然灾害学报 2007年第1期16卷 45-49页

作者：景学义王永波陶国辉哈尔滨市气象局黑龙江哈尔滨150080

利用2004年7-9月和2005年4-9月的磨盘山流域雨量站逐日降水资料和ECMWF24～168h的格点资料,并依据最小离度相似原理,进行相似离度过滤,通过从历史样本中选出与预报形势演变场最相似的样本,可以对磨盘山库区未来1～7 d的面雨量等级进行预... 详细信息

利用2004年7-9月和2005年4-9月的磨盘山流域雨量站逐日降水资料和ECMWF24～168h的格点资料,并依据最小离度相似原理,进行相似离度过滤,通过从历史样本中选出与预报形势演变场最相似的样本,可以对磨盘山库区未来1～7 d的面雨量等级进行预报,并具有较满意的精度。

关键词：降水预报磨盘山水库

Real-world evidence on the efficacy and safety of vonoprazanamoxicillin dual therapy for Helicobacter pylori treatment in elderly patients

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2025年第1期31卷 68-78页

作者： Wen Gao jing-Wen Li Hui Ye xue-Zhi Zhang Jian-Xiang Liu Hong Cheng Department of Gastroenterology Peking University First HospitalBeijing 100034China School of Medicine Tsinghua MedicineTsinghua UniversityBeijing 100034China Department of Traditional Chinese Medicine and Integrative Medicine Peking University First HospitalBeijing 100034China

BACKGROUND A dual therapy regimen containing amoxicillin is a common treatment option for the eradication of Helicobacter pylori(***).While substantial research supports the efficacy and safety of vonoprazan and amoxicillin(VA)dual therapy in the general population,there is still a lack of studies specifically focusing on its safety in elderly *** To evaluate efficacy and safety of VA dual therapy as first-line or rescue treatment for *** in elderly *** As a real-world retrospective study,data were collected from elderly patients aged 60 years and above who accepted VA dual therapy(vonoprazan 20 mg twice daily+amoxicillin 1000 mg thrice daily for 14 days)for *** eradication in the Department of Gastroenterology at Peking University First Hospital between June 2020 and January *** status was evaluated by^(13)C-urease breath test 6 weeks after *** adverse events(AEs)during treatment were *** In total,401 cases were ***-one cases were excluded due to loss to follow-up,lack of re-examination,or unwillingness to take *** total of 380 included cases comprised 250 who received VA dual therapy as first-line treatment and 130 who received VA dual therapy as rescue *** was successfully eradicated in 239 cases(95.6%)in the first-line treatment group and 116 cases(89.2%)in the rescue treatment *** overall incidence of AEs was 9.5%for both ***,9.2%of patients experienced an AE in the first-line treatment group and 10.0%in the rescue treatment *** patients discontinued treatment due to AE,with a discontinuation rate of 1.3%.No serious AE *** The VA dual therapy regimen as a first-line treatment and a rescue therapy was effective and safe for elderly patients aged 60 and older.

关键词： Helicobacter pylori Vonoprazan Amoxicillin Dual therapy Elderly

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

以《大明令》为枢纽看中国古代律令制体系

法制与社会发展 2011年第5期17卷 111-130页

作者：霍存福张靖翊冯学伟吉林大学法学院吉林长春130012

清代有律、有例而无令,清例沿用明令,数量虽然不大,但揭示了明代令制的去向。这一事件的性质,只有从部门法视角看,才能准确地为其定位;对清例转化明令的基本事实的分析,有助于厘清律令制发展的线索;比较晋唐宋令、元条格与明令、清例的... 详细信息

清代有律、有例而无令,清例沿用明令,数量虽然不大,但揭示了明代令制的去向。这一事件的性质,只有从部门法视角看,才能准确地为其定位;对清例转化明令的基本事实的分析,有助于厘清律令制发展的线索;比较晋唐宋令、元条格与明令、清例的沿袭关系,对中国古代法律部门的初始分化、法典分工及编纂等问题的理解和把握,具有重要理论意义。

关键词：中国古代律令制明令清例读例存疑

在线全文

学校读者我要写书评

暂无评论

晚清青楼小说的传播与南方文化

安徽师范大学学报（社会科学版） 2006年第1期34卷 82-86页

作者：荆学义天津外国语学院汉学院天津300071

清代后期以大上海为轴心,江、浙繁华商埠为辐射带,形成了极具江南文化意味的以《海上花列传》为代表的青楼小说系列。清代后期小说的这种地域文化特征在中国古典小说的演进历程中是独特的,从清代后期青楼小说叙事风格的地域化与传播走... 详细信息

清代后期以大上海为轴心,江、浙繁华商埠为辐射带,形成了极具江南文化意味的以《海上花列传》为代表的青楼小说系列。清代后期小说的这种地域文化特征在中国古典小说的演进历程中是独特的,从清代后期青楼小说叙事风格的地域化与传播走向、接受群体审美心理结构的地域化;小说叙事主体的生活与社会生活的濡染;小说的文化渊源与南方文化生态及相关的人文背景等层面来阐释清代后期文坛这一奇特的文学和文化现象。

关键词：晚清文学文化生态南方文化青楼小说传播