浅谈园林绿化的发展趋势

提出了21世纪园林绿化的主题、历史使命和发展趋势.     

海明威悲剧人生的艺术表达

海明威富有传奇色彩的人生经历已成为现代美国神话,融入他的小说创作之中。他在四部经典小说中对人类悲剧性的处境、个人在这个荒诞世界上“单独媾和”的可能性以及人应如何有尊严地活着或悲壮地死去等问题进行了探索,并以桑地亚哥追求自我的实现的最高境界结束他的艺术生涯。     

虚实兼美美在其中--黄宾虹山水画的虚实表现

虚实表现是黄宾虹山水画的艺术魅力所在。黄宾虹山水画作品中的虚与实 ,有别于传统绘画中笔墨章法呈现的黑白、疏密与详略关系 ,是作品中内与外、物象与形式的关系 ;是笔墨章法与宇宙生命力、民族精神的关系 ;是笔墨章法与物象之间的关系。正是在这个层面上 ,黄宾虹山水画作品中的虚实表现才具有独特的艺术价值。     

人脸检测和表情识别在课堂教学评价中的应用

传统的课堂教学评价往往效率低下,并带有较强的主观性。针对传统课堂评价中存在的不足,结合深度学习技术,在CNN模型基础上建立起适合课堂场景的人脸检测和表情识别模型,得到比较准确的人脸特征,接着使用朴素贝叶斯分类器对得到的人脸特征进行分类和评价,然后研究面部特征与课堂质量之间的关系,最后建立起基于人脸检测和表情识别的课堂评价规则。实验数据表明,本研究可以作为课堂教学评价的重要参考指标。     

贫富分化的阶层化及其政治挑战

在中国贫富分化的进程中出现了贫富分化的阶层化，章通过对农业劳动和失业两个低收入阶层的现状及加入WTO后所面临的双重挑战的分析，指出贫富分化的阶层化阻碍了合理的社会结构和收入分配结构的出现，并对如何完善我国现行的利益表达途径和处理矛盾的手段以及方式的现代化提出了新的要求。     

Quantitative analysis of a panel of gene expression in prostate cancer——with emphasis on NPY expression analysis

Objective: To investigate molecular alterations associating with prostate carcinoma progression and potentially provide information toward more accurate prognosis/diagnosis. Methods: A set of laser captured microdissected (LCM) specimens from 300 prostate cancer (PCa) patients undergoing radical prostatectomy (RP) were defined. Ten patients representing "aggressive" PCa, and 10 representing "non-aggressive" PCa were selected based on prostate-specific antigen (PSA) recurrence,Gleason score, pathological stage and tumor cell differentiation, with matched patient age and race between the two groups.Normal and neoplastic prostate epithelial cells were collected with LCM from frozen tissue slides obtained from the RP specimens.The expressions of a panel of genes, including NPY, PTEN, AR,AMACR, DD3, and GSTP1, were measured by quantitative real-time RT-PCR (TaqMan), and correlation was analyzed with clinicopathological features. Results: The expressions of AMACR and DD3 were consistently up-regulated in cancer cells compared to benign prostate epithelial cells in all PCa patients, whereas GSTP1 expression was down regulated in each patient. NPY, PTEN and AR exhibited a striking difference in their expression patterns between aggressive and non-aggressive PCas (P=0.0203, 0.0284, and 0.0378, respectively, Wilcoxon rank sum test). The lower expression of NPY showed association with "aggressive" PCas based on a larger PCa patient cohort analysis (P=0.0037,univariate generalized linear model (GLM) analysis). Conclusion: Despite widely noted heterogeneous nature of PCa, gene expression alterations of AMACR, DD3, and GSTP1 in LCM-derived PCa epithelial cells suggest for common underlying mechanisms in the initiation of PCa. Lower NPY expression level is significantly associated with more aggressive clinical behavior of PCa; PTEN and AR may have potential in defining PCa with aggressive clinical behavior. Studies along these lines have potential to define PCa-associated gene expression alterations and likely co-regulation of genes/pathways critical in the biology of PCa onset/progression.     

浅谈素描学习中的形体结构训练

素描学习中我们大部分时间和精力都用在具体描绘对象,追求明暗调子方面,所以忽视了对象本身的形体结构训练。在学习中,由于各自的认识和喜好不同,在表现手法上也各有千秋,但是不论学习什么样的表现手法,我们都要学习最根本的东西:准确的表现形体结构。     

中国油画"民族化"的艺术形式

本文通过研究中国油画家探讨的中国油画“民族化”问题，结合自己的创作实践，从艺术形式方面论述中国油画“民族化”需要在“中西结合”上不断探索和补充，形成能把民族精神和民族气质自然融入作品的富有中国油画特色的民族风格。     

Science Letters:Construction of a eukaryotic expression plasmid of Humanin

Objective:To construct a eukaryotic expression plasmid pcDNA3.1(-)-Humanin.Methods:The recombinant plasmidpGEMEX-1-Humanin was digested with restriction endonucleases BamH Ⅰ and Hind Ⅲ and the Humanin gene fragments,about100 bp length,were obtained.Then the Humanin gene fragments were inserted into eukaryotic expression vector pcDNA3.1(-)andthe recombinant plasmids pcDNA3.1(-)-Humanin were identified by sequencing.Results:Recombinant plasmid DNA success-fully produced a band which had the same size as that of the thimauin positive control.The sequence of recombinant plasmidsaccorded with the Humnain gene sequence.Conclusions:A eukaryotic expression plasmid of Humanin was successfully con-structed.     

利用多项式将一种代数式的分母有理化

某些代数式除能利用行列式对分母有理化外 ,还能利用多项式对分母有理化 ,并且其结论可作进一步的推广 .