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Search Results: 1 - 10 of 29831 matches for " 魏丰 "
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道德评价的层次性――兼论知识在道德评价中的作用

南京农业大学学报 , 1989, DOI: 10.7685/j.issn.1000-2030.1989.00.009
Abstract: 在现实生活中,什么行为是道德的,应该加以支持和赞扬;什么行为是不道德的,应该予以反对和批评,人们根据什么原则去议论别人,对别人的行为进行评价的呢?这就涉及伦理学中的道德评价的根据问题。关于道德评价的根据问题,历来众说纷纭、争论不休。争论的焦点,就是动机和效果的问题。评价人们行为善恶,好坏,是看动机,还是看效果?或者是动机和效果的辩证统一?
非交换素环上的导子
,韩栋
北京理工大学学报 , 2004,
Abstract: 设R是一个(n+1)!-扭自由非交换素环,d和g均为环R的Jordan导子,如果对任意的x∈R都有xdxn-xnxg属于环R的中心,那么有d=0且g=0.
带有广义导子环的交换性
,成会文
北京理工大学学报 , 2004,
Abstract: 设R是一个特征不等于2的素环,δ为R的一个广义导子,d为其伴随导子.讨论R满足下列任何一个条件时的交换性,1.δ(x,y)=x,y;2.δ(xy)=xy;3.δ(x),x=0,其中x,y为R的某一个子集中的元素.
基于压缩感知观测值的数字图像水印算法
,梁栋,张成
安徽大学学报(自然科学版) , 2013,
Abstract:
苏州市区信息通讯企业空间集聚与新企业选址
,也华,陈雯,金志
地理学报 , 2010, DOI: 10.11821/xb201002003
Abstract: 高科技产业是全球化背景下城市发展与区域竞争的关键,但是高科技产业发展空间极不平衡,空间要素显著影响高科技企业区位选择及空间集聚。针对现有研究主要集中在国家、省等大尺度单元,本文引入空间点模式分析方法,探讨了1996-2006年间苏州市区不同空间尺度上信息通讯企业的时空集聚特征。研究发现在0~6km的尺度上,信息通讯企业表现出明显的集聚特征,并随着尺度的增加呈现出倒"U"型集聚趋势;随着时间的推移,企业空间集聚的"热点地区"逐渐从老城区向外围推移,但是集聚峰区依然主要分布在老城区及其外围的国家和省级开发区;同时,新企业的选址与原有企业的分布特征表现出很强的相关性。运用计数模型的计量结果也表明企业集聚特征对新企业区位选择具有显著影响,同时起作用的还有地方政府政策影响下的开发区建设、城市内外交通条件、自然环境条件等因素。
ISW2缺失下基因功能对核小体定位影响的研究
The Impact of Gene Function on Nucleosome Positioning in the Absence of ISW2
 [PDF]

胡焕, 继华, 恨恨, 周晓雯, 李泽华
Biophysics (BIPHY) , 2015, DOI: 10.12677/BIPHY.2015.34007
Abstract:
为研究染色质重塑因子对核小体定位的影响以及ISW2缺失情况下基因功能对核小体形成的作用,本文分别对ISW2敲除、野生型(WT)及富营养培养条件下(YPD)三种酵母核小体占位率数据进行聚类、比较、分析后发现,在ISW2缺失情况下核小体的位置远离TSS,同时发现11种基因功能对核小体的定位产生了显著影响。
To study the impact of chromatin remodeling factor on nucleosome positioning and the function of gene in the formation of nucleosomes in the absence of ISW2, this paper compares and analyzes the data on the proportion of nucleosomes in three kinds of yeasts, which are cultured without ISW2, WT or in YPD. The study finds that in the absence of ISW2 the nuclesomes are far from TSS and that 11 genes impose noticeable impact on nuclesome positioning.
胰腺神经内分泌肿瘤的影像学表现与病理对照分析
Pancreatic Neuroendocrine Tumors: Correlation between the Imaging Findings and Pathology
 [PDF]

张玉婷, 李大铭, , 王丹, 周俊林
Medical Diagnosis (MD) , 2016, DOI: 10.12677/MD.2016.63011
Abstract: 目的:探讨胰腺神经内分泌肿瘤的影像学特征,以提高对其诊断水平。方法:回顾性分析24例经病理证实的胰腺神经内分泌肿瘤患者的影像资料,并与病理结果进行对照分析。结果:8例功能性胰腺神经内分泌肿瘤平均大小为2.1 cm × 2.6 cm,平扫7例呈均匀的等或稍低密度,1例呈稍长T1、稍长T2信号,1例胰头肿瘤侵及十二指肠;16例非功能性胰腺神经内分泌肿瘤平均大小为2.5 cm × 4.3 cm,其中9例为实性,5例为囊实性,2例为囊性,实性部分呈等或稍低密度,MRI上呈稍长T1、稍长T2信号,囊性部分呈近似水样密度或信号,6例与十二指肠分界不清,2例出现脾静脉局部变细,1例肿瘤与脾脏分界不清,5例出现腹膜后或胰周淋巴结转移。增强扫描动脉期17例表现为明显强化,7例表现为轻-中度强化,9例可见包膜环形强化;与动脉期强化程度相比,门静脉期及延迟期19例强化程度下降,另有2例呈肝血管瘤样的填充式强化,3例呈渐进性强化。与手术病理诊断对照,术前影像诊断符合率为67% (16/24)。结论:功能性胰腺神经内分泌肿瘤多表现为较小的实性结节,非功能性者多表现为较大的不均质肿块,增强扫描呈明显强化、包膜环形强化为其特征,轻-中度强化及明显囊变者相对少见。
Objective: To investigate imaging features of pancreatic neuroendocrine tumors (PanNETs), so as to improve its clinical diagnosis. Materials and Methods: A retrospective analysis of the imaging data of 24 patients with pathologically confirmed PanNETs is conducted and the results were compared with the pathology. Results: There were 8 functional PanNETs with an average size of 2.1 cm × 2.6 cm, which showed homogeneous density or signal, 1 case of which had invasion of duodenum. There were 16 non-functional PanNETs with an average size of 2.5 cm × 4.3 cm, nine of which were solid lesions, seven of which were cystic lesions. Solid part of the PanNETs showed equal or slightly low density, and slightly longer T1, T2 signal in the MRI. Cystic part of the PanNETs showed water-like density or signal. 6 cases had unclear boundaries with duodenum, 1 case had unclear boundaries with spleen, and two cases appeared to thinner splenic vein. 5 cases had lymph node metastasis in retroperitoneal or peripancreatic. Contrast-enhanced examinations showed that 17 lesions had marked enhancement, 7 lesions had mild-moderate enhancement, and 9 lesions had capsule marked ring-like enhancement. 19 lesions had decreased enhancement in the portal venous phase and delay phase, 3 lesions had progressive enhancement, and 2 lesions had filled enhancement. The preoperative accuracy of diagnosis compared with pathology was ?67% (16/24). Conclusion: Functional PanNETs could be manifested as small solid nodules, and non-functional ones could be manifested as large heterogeneous lump. PanNETs were characterized by marked enhancement with capsule marked ring-like enhancement during contrast scanning, mild-moderate enhancement and obviously cystic changes were relatively rare.
Policy-Based Segmentation Firewall Conformance Testing
基于策略分段的防火墙一致性测试

郐吉,,蒋凡
计算机系统应用 , 2007,
Abstract: 防火墙是设置在被保护网络和外部网络之间的一道屏障.网络通信需要防火墙根据特定安全策略下进行监控和过滤.防火墙是否有效起到防护作用需要通过防火墙实现和安全策略配置的一致性测试.本文提出了一种改进的防火墙一致性测试方法,引入策略分段的思想,对非原子策略规则有选择的产生测试例,缩减了网络地址空间,将指数级测试例数目O(2101rpmn2)降低为多项式级O(Mpmn2),减少了产生的测试例的数量,有效提高了测试效率.
拉大间隙装静子对转子试验性能的影响
段连,玉冰
工程热物理学报 , 1995,
Abstract:
反复发作的抗凝血类灭鼠药致获得性凝血功能障碍三例
罗文,,倪勋
华西医学 , 2012, DOI: CNKI:51-1356/R.20120214.1338.005
Abstract: 目的 分析反复发作的抗凝血类灭鼠药所致获得性凝血功能障碍的临床特点,探讨其诊治方案。方法 对2009年3月-2010年12月收治的3例抗凝血类灭鼠药所致获得性凝血功能障碍患者的临床表现、实验室检查和治疗转归进行分析,并复习相关文献。结果 3例患者均以同时出现多部位出血为首发表现,经应用维生素K1、凝血酶原复合物、新鲜冰冻血浆、冷沉淀等治疗,患者病情好转,实验室指标恢复正常。停药(2、5周,3个月)后再次出现多部位出血,再给予维生素K1等治疗,病情可缓解。结论 维生素K1可作为首选的治疗药物,且对反复发作的患者同样有效。为避免再发性出血,应维持治疗至少3个月。
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