GPPre: A Python-Based Tool in Grasshopper for Office Building Performance Optimization

With the development of the economic and low-carbon society, high-performance building (HPB) design plays an increasingly important role in the architectural area. The performance of buildings usually includes the building energy consumption, building interior natural daylighting, building surface solar radiation, and so on. Building performance simulation (BPS) and multiple objective optimizations (MOO) are becoming the main methods for obtaining a high performance building in the design process. Correspondingly, the BPS and MOO are based on the parametric tools, like Grasshopper and Dynamo. However, these tools are lacking the data analysis module for designers to select the high-performance building more conveniently. This paper proposes a toolkit “GPPre” developed based on the Grasshopper platform and Python language. At the end of this paper, a case study was conducted to verify the function of GPPre, which shows that the combination of the sensitivity analysis (SA) and MOO module in the GPPre could aid architects to design the buildings with better performance.     

The response of plasma parameters and energy transport in the plasma sheet to interplanetary magnetic field Bz

Science China Technological Sciences - We use 9 years data of Cluster to study the dependencies of plasma parameters and energy transport in the plasma sheet on the lasting time of...     

An improved form of smoothed particle hydrodynamics method for crack propagation simulation applied in rock mechanics

The simulation of crack propagation processes in rock engineering has been not only a research hot spot among scholars but also a challenge. Based on this background, a new numerical method named improved kernel of smoothed particle hydrodynamics(IKSPH) has been put forward. By improving the kernel function in the traditional smoothed particle hydrodynamics(SPH) method, the brittle fracture characteristics of the base particles are realized. The particle domain searching method(PDSM) has also been put forward to generate the arbitrary complex fissure networks. Three numerical examples are analyzed to validate the efficiency of IKSPH and PDSM, which can correctly reveal the morphology of wing crack and the laws of crack coalescence compared with previous experimental and numerical studies.Finally, a rock slope model with complex joints is numerically simulated and the progressive failure processes are exhibited, which indicates that the IKSPH method can be well applied to rock mechanics engineering. The research results showed that IKSPH method reduces the programming difficulties and avoids the traditional grid distortion, which can provide some references for the application of IKSPH to rock mechanics engineering and the understanding of rock fracture mechanisms.     

新型水煤浆喷嘴试验研究与应用

本文提出了一种新型水煤浆喷嘴──撞击式多级雾化水煤浆喷嘴，该喷嘴雾化质量高，气耗率低，防堵性能好，使用寿命长，且具有良好的负荷调节性能。     

一种新型燃烧装置的探索

热声现象是放热过程和声学脉动之间的一种正向的相互激励，利用热声效应的Ｒｉｊｋｅ型燃烧器具有高燃烧效率，低过剩空气系数等特点，本文探讨了开发新型燃烧装置需要解决的问题，以及国内研制新型燃烧器的作用和意义。     

直廓环面蜗杆螺旋齿面的数形解析

对直廓环面蜗杆螺旋齿面的生成原理进行分析，建立数学表达式，为实现计算机输出创造条件。     

中国酸雨的过去、现在和将来

从80年代以来,中国的酸雨污染呈加速上升趋势.继欧洲和北美之后,中国出现了世界第三大酸雨区.中国的酸雨主要发生在长江以南,青藏高原以东地区和四川盆地.中国形成酸雨的两种主要机制是大气致酸污染物的局地冲刷和中长距离传输.根据对致酸污染物未来排放量的预测,中国的酸雨区在2020年以前将继续扩大.     

H13钢的退火软化

应用Ｆｆｏｒｍａｓｔｅｒ－Ｄｉｇｉｔａｌ全自动相变仪测定了Ｈ１３钢的退火用ＴＴＴ图，利用物理化学相分析法，扫描电镜分析，Ｘ射线衍射分析，测定研究了Ｈ１３钢不同退火工艺处理后钢的基体中合金元素含量，碳化物类型，尺寸，分布和相对数量，测量钢的退火硬度，分析了硬度与碳化物粒子大小，相对数量，碳化物结构类型的依赖关系。     

LPE生长外延片超薄有源层结构的SEM研究

通过对液相外延（LPE）生长的外延片不同处理方法的研究，摸索出一条利用扫描电子显微镜（SEM）来观测有源区厚度的有效方法──蒸金法，最优可观察有源区厚度20nm，对设计厚度为18nm结构来说[1]，这是一种便利而有效的观察手段。     

逻辑设计的一种新方法——以异或门为基础的逻辑设计

提出井阐述了以异或门为基础的组合逻辑电路的设计原理和设计方法,结合具体实例,指明了谊方法的适用范围,以及在优化逻辑设计、提高电路性能方面的优越性。