工业建筑遗产的视觉研究初探

视觉属性既是工业建筑的特殊属性又是人们认知事物的特殊属性,视觉传达便作为工业建筑与人之间的一种主导地位的信息传达方式。该文利用视觉在人们生活中的重要地位及其作用效果与工业建筑的自身特征属性的一个结合点,深化探讨这一凌驾于其他一般属性的特殊视觉属性的内容：建筑物、构筑物和工业景观等工业建筑的视觉要素,并进一步阐释工业建筑巨大的尺度,明显的中心,沉闷的色系,材质的厚重感、强烈的秩序感,简明的几何性,暴露的机械性等视觉特征,通过这些角度挖掘出工业建筑遗产内在核心价值规律,并使之作为工业建筑遗产保护措施的理论依据。     

Mechanical Properties of Nylon 6,6/Polyvinyl Butyral Blends

The mechanical properties of Nylon 6,6 blended with recycled scrap material, polyvinyl butyral (PVB), using maleated styrene-ethylene-butylene-styrene block copolymer (SEBS-g-MA) as a compatibilizer are discussed. Control samples of Nylon 6,6/PVB blends and Nylon 6,6/SEBS-g-MA blends were also compared. The results show Nylon 6,6/PVB blends give higher tensile strength than Nylon 6,6/SEBS-g-MA blends. As for Nylon 6,6/SEBS-g-MA/PVB blends, impact strength increases with increasing the dosage of SEBS-g-MA. PVB improves flexural and tensile properties but sacrifices impact strength of the blends. Meanwhile, the ductile-brittle transition temperature (DBTT) increases with increasing PVB content. Through morphology observation, hole sizes are smaller with increasing SEBS-g-MA content. In summary, suitable amounts of PVB scrap are vital to balance both rigidity and toughness of blends. This study helps to understand the role of PVB in Nylon 6,6 blend systems, which allows PVB to find a practical application based on economic and environmental concerns.     

蜂胶相关产品标准现状分析

蜂胶是一种极为稀少的天然资源,素有“紫色黄金”之称.目前有关蜂胶的标准包括国家标准,行业标准,地方标准,各标准并行有效,企业选择时缺乏依据,不利于统一管理和市场规范;有些标准中的方法成本较高,企业难以承受;有些标准内容交叠,也增加了企业的使用成本;如果能对这些标准进行统一整合,不仅有利于规范市场和产品,也有利于企业提升...     

Control of properties in silicone hydrogels by using a pair of hydrophilic monomers

Silicone hydrogels have been under intensive investigation for use in the biomedical field, especially as contact lenses. When silicone hydrogels were prepared using a combination of N-vinyl pyrrolidone and N,N-dimethyl acrylamide as the hydrophilic monomers, it was found that the surface wettability of these hydrogels can be improved with the mechanical properties and that water contents are in the acceptable range for certain applications, such as contact lenses. © 1996 John Wiley & Sons, Inc.     

Identification of DNA Damage Repair-Associated Prognostic Biomarkers for Prostate Cancer Using Transcriptomic Data Analysis

In the recent decade, the importance of DNA damage repair (DDR) and its clinical application have been firmly recognized in prostate cancer (PC). For example, olaparib was just approved in May 2020 to treat metastatic castration-resistant PC with homologous recombination repair-mutated genes; however, not all patients can benefit from olaparib, and the treatment response depends on patient-specific mutations. This highlights the need to understand the detailed DDR biology further and develop DDR-based biomarkers. In this study, we establish a four-gene panel of which the expression is significantly associated with overall survival (OS) and progression-free survival (PFS) in PC patients from the TCGA-PRAD database. This panel includes DNTT, EXO1, NEIL3, and EME2 genes. Patients with higher expression of the four identified genes have significantly worse OS and PFS. This significance also exists in a multivariate Cox regression model adjusting for age, PSA, TNM stages, and Gleason scores. Moreover, the expression of the four-gene panel is highly correlated with aggressiveness based on well-known PAM50 and PCS subtyping classifiers. Using publicly available databases, we successfully validate the four-gene panel as having the potential to serve as a prognostic and predictive biomarker for PC specifically based on DDR biology.     

Adaptive Responses of Citrus grandis Leaves to Copper Toxicity Revealed by RNA-Seq and Physiology

Copper (Cu)-toxic effects on Citrus grandis growth and Cu uptake, as well as gene expression and physiological parameters in leaves were investigated. Using RNA-Seq, 715 upregulated and 573 downregulated genes were identified in leaves of C. grandis seedlings exposed to Cu-toxicity (LCGSEC). Cu-toxicity altered the expression of 52 genes related to cell wall metabolism, thus impairing cell wall metabolism and lowering leaf growth. Cu-toxicity downregulated the expression of photosynthetic electron transport-related genes, thus reducing CO₂ assimilation. Some genes involved in thermal energy dissipation, photorespiration, reactive oxygen species scavenging and cell redox homeostasis and some antioxidants (reduced glutathione, phytochelatins, metallothioneins, l-tryptophan and total phenolics) were upregulated in LCGSEC, but they could not protect LCGSEC from oxidative damage. Several adaptive responses might occur in LCGSEC. LCGSEC displayed both enhanced capacities to maintain homeostasis of Cu via reducing Cu uptake by leaves and preventing release of vacuolar Cu into the cytoplasm, and to improve internal detoxification of Cu by accumulating Cu chelators (lignin, reduced glutathione, phytochelatins, metallothioneins, l-tryptophan and total phenolics). The capacities to maintain both energy homeostasis and Ca homeostasis might be upregulated in LCGSEC. Cu-toxicity increased abscisates (auxins) level, thus stimulating stomatal closure and lowering water loss (enhancing water use efficiency and photosynthesis).     

Coordination engineering of cobalt phthalocyanine by functionalized carbon nanotube for efficient and highly stable carbon dioxide reduction at high current density

Coordination engineering can enhance the activity and stability of the catalyst in heterogeneous catalysis.However,the axial coordination engineering between di...     

地方院校开展微型有机化学实验教学初探

选取几个典型的基础有机化学实验,通过常量、半微量、微量的比较实验,揭示了微型实验教学的一些优点和存在的问题,并提出了解决的方法。确认微型实验是实验改革的方向。     

UML与I2DEF(Integrated IDEF)建模方法及相关建模工具评述

介绍了一种新的建模方法——I2DEF.I2DEF方法吸取了IDEF、OMT、UML、OOSE、OOA/OOD等优秀建模方法的优点,是一种综合性的方法.并将其与UML建模方法进行比较,充分分析了这两种方法的优缺点.并以RationalRose作为UML建模工具的代表,与I2DEF方法的建模工具PlayCASE在功能、性能方面进行比较.最后对两种方法进行总结,提出将来建模工具发展的方向以及对开发人员的建议.