三里屯Village的开放实验——开放城市中的开放建筑

城市生活是街道对面的小市场，是拐角处的露天影院，是飘香的熟食店，是饱餐后仍驻足停留的面包房，是扣动心弦的影片，是对熟悉的重新发现，是你我的对话。     

Dose-rate dependence of heat radiosensitization

The dose rate dependence of heat radiosensitization was studied using rat astrocytoma cells in culture and a clinically relevant protocol of heat dose and heat radiation sequence. Cells were treated with a minimally toxic heat dose of 43 degrees C for 30 minutes, after which they were irradiated with varying doses of radiation at dose rates ranging from 0.567 to 300 cGy/min. This heat dose substantially reduced the extrapolation number (n), but had little effect on Do of the radiation survival curve at dose rates of 50 cGy/min or greater. At dose rates less than 10 cGy/min, 43 degrees C for 30 min had little effect on n and only for the lowest dose rate studied (0.567 cGy/min) was there a significant reduction in Do (60%). The thermal enhancement ratio did not vary inversely with radiation dose rate over the dose rate range studied but, instead, was maximal at the two dose rate extremes (0.567 and 300 cGy/min). These data demonstrate that a clinically relevant heat dose enhances very low dose rate, as well as high dose rate, ionizing radiation, but suggest that little benefit is to be gained from using dose rates intermediate between conventional radiotherapeutic high dose rates or dose rates representative of interstitial implants.     

Effects of the matrix crystallinity,dispersed phase,and processing type on the morphological,thermal, and mechanical properties of polylactide-based binary blends with poly[(butylene adipate)-co-terephthalate] and poly[(butylene succinate)-co-adipate]

In this study, we prepared immiscible blends of 75 wt % polylactide (PLA) with 25 wt % poly[(butylene adipate)-co-terephthalate] (PBAT) through an injection-molding (IM) process and a twin-screw extruder (TSE) followed by IM. An amorphous polylactide (A-PLA) and a semicrystalline polylactide (SC-PLA) were used as the matrixes to investigate the matrix crystallization effect on the morphology and property development of the blends with only IM. A blend of A-PLA with 25 wt % poly[(butylene succinate)-co-adipate] (PBSA) was also prepared through IM to compare its properties with those of the A-PLA–PBAT blends. The morphological, thermal, solid viscoelastic, tensile, and flexural properties of the blends were compared, and their dependency on the evolution of the blend morphology was analyzed. The tensile results show that when IM was used as the sole processing technique, the ductility and toughness were significantly improved only when SC-PLA was used as the matrix. Preprocessing through TSE also resulted in the enhancement of the blend ductility. In A-PLA–PBSA, the vitrification of PLA hindered the crystallization of PBSA to very low temperatures (<0°C) and resulted in a very nonuniform structure with weak intermolecular bonding between phases. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47636.     

昆明世博"IN的家"

INTEGER项目是由建筑师Nicholas Thompson先生和信息技术专家Alan Kell于1996年发起的,目的是使主流住宅建筑具有更佳性能及更高价值.此项目目的还在于,充分利用信息技术和可持续发展的双重力量,或者称之为智能化和绿色环保技术,以满足住宅建筑所承担的社会、经济和环境责任的要求.在2003年,Hexy(Horti-Expo Xing Yun房地产有限公司)与INTEGER签署了合作协议,共同在昆明世博会所在地开发"世博IN的家"项目.     

Characterization of SiO2-encapsulated WSi2/W5Si3 nanoparticles synthesized by a mechanochemical route

This study reports on the mechanochemical synthesis (MCS) of SiO₂-encapsulated WSi₂/W₅Si₃ nanoparticles starting from tungsten oxide (WO₃), silicon dioxide (SiO₂) and magnesium (Mg) powder blends. MCS process, carried out in a high-energy ball mill, was evaluated in terms of various milling time and initial composition of WO₃-SiO₂-Mg powders. A subsequent purification step using aqueous HCl solution was conducted on the as-synthesized powders. Compositional, microstructural and thermal properties of the powders were characterized by using X-ray diffractometer (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM) and differential scanning calorimeter (DSC). Based on the adiabatic temperature values, SiO₂-encapsulated WSi₂/W₅Si₃ nanoparticles exhibit a high potential as a result of a mechanically induced self-sustaining reaction. The exothermic reaction took place after 20?min of milling, and WSi₂, W₅Si₃, W, MgO, Mg₂SiO₄ and residual Mg phases were detected. The utilization of an optimized amount of excess Mg (3.5?mol) resulted in the elimination of unwanted Mg₂SiO₄ and W phases, leaving behind WSi₂, W₅Si₃, Mg₂Si, MgO and Mg. After removal of Mg-based by-products by leaching process, WSi₂, W₅Si₃ and a very small amount of SiO₂ phases were obtained. TEM analysis revealed that W silicide nanoparticles with an average size of 97?nm were encapsulated by SiO₂ layers with an average thickness of 15?nm.