Antoni Gaudí and Frei Otto: Essential Precursors to the Parametricism Manifesto

As Senior Architect to the Basilica of the Sagrada Família in Barcelona, Mark Burry has been ‘thinking parametrically’ for almost his entire career. Here he describes how his longstanding role overseeing the completion of Antoni Gaudí's masterpiece has afforded unique insights into the work of a great geometer and parametric thinker. Burry places the contribution of Gaudí alongside that of Frei Otto – the other eminent 20th-century Proto-Parametricist.     

Miesian Grids and the Domain of Ink

What happens when you subvert the standardised repetition of the Modernist grid? In Building the Picture, a series of drawings that architect Elena Manferdini produced for an exhibition at the Art Institute of Chicago that ran during the spring and summer of 2015, visual effects and colour were applied to counteract Mies's highly uniform and modular mass-producible systems.     

In the Pursuit of Pleasure: The Not so Fleeting Life of the Pavilion and its Ilk

Author and architecture critic for the London Evening Standard, Robert Bevan reflects on the enduring appeal of the temporary structure, speaking ‘to a latent desire for freedom and movement’ as a hangover of our nomadic past in a sedentary ‘civilised’ society. He highlights the type's historical apex in Henry VIII's palatial pop-up on the Field of the Cloth of Gold, questioning the purpose and purposelessness of more recent examples.     

Suppression of a spontaneous dust density wave by modulation of ion streaming

Synchronization of a self-excited dust density wave has been experimentally investigated in a strongly coupled dusty plasma. A dust density wave of frequency ~78 Hz is spontaneously generated from the dust void boundary due to the ion streaming instability. The electric field in the dust void region is measured, and the electric field force and ion drag force on the dust particles at the void boundary are estimated to explain the mechanism of spontaneous dust density wave excitation. Synchronization occurring through the suppression mechanism is observed by modulating the ion streaming by applying an external sinusoidal signal to the dust void. At sufficiently high modulation amplitude, the onset of period-doubling bifurcation is observed. Fast Fourier transform spectral analysis is done using time-series data obtained from high-speed video imaging. The van der Pol equation with a force term is used to correlate the observed suppression phenomena.     

运用空腔效应选择煤衍生油提酚萃取剂

为缩小煤衍生油提酚萃取剂的筛选范围,减少试验次数,对富含酚类化合物的典型煤衍生油进行单体酚分析及中性油组分的定性分析,运用空腔效应和键能数据相结合的方法在众多有机溶剂中进行煤衍生油提酚萃取剂的筛选,通过计算得出萃取过程中消耗的能量,缩小筛选范围。结果表明,典型煤衍生油酚油馏分中酚类化合物主要以苯酚和甲酚等低级酚为主,中性油主要以茚和萘等单环或双环芳烃为主。烷烃和芳香烃类的惰性溶剂萃取时消耗能量-2~1 k J/mol,不适合作为煤衍生油提酚萃取剂。而醇类、羧酸类、醚类、酮类、胺类等与酚类化合物分子间存在氢键的溶剂萃取时消耗能量-80~20 k J/mol,初步筛选适合作为煤衍生油提酚萃取剂。醇类和羧酸类等分子内存在氢键的溶剂比醚类、酮类和胺类等分子间只存在范德华键的溶剂在萃取过程中需消耗更多的能量。     

Modified van Laar’s Equation and Its Application to VLE ofPolymer Solutions

The original van Laar‘s theory has been modified. The internal pressures of components and mixture are expressed by Prank‘s relation and the excess entropy for mixing of components is also considered. A new activity coefficient equation, which can be satisfactorily applied to polymer solutions, is obtained. The calculated results for the VLE of 179 polymer solutions show that the accuracy of fit is evidently superior to UNIQUAC equation.     

Li-decorated graphyne as high-capacity hydrogen storage media: First-principles plane wave calculations

Taking into account the van der Waals correction, the characteristics of the Li-decorated graphyne as the hydrogen storage medium have been explored using first-principles plane wave calculations. We find that Li atom can be adsorbed not only over the center of large hexagon (H_L site) but also over the center of small hexagon (H_S site). For double-side Li decorations, there are 14H₂ molecules can be adsorbed on Li-decorated graphyne primitive cell with the adsorption energy of 0.19 eV/H₂. As a result, the hydrogen storage capacity of 13.0 wt% can be obtained. This suggests that the Li-decorated graphyne system can serve as a high-capacity hydrogen storage medium.     

Correlating and Predicting the Solubilities of Solid n-Alkanes in Supercritical Ethane Using Carnahan-Starling-van der Waals Model

The solubilities of some solid n-alkanes in supercritical ethane were correlated and predicted in this paper using the Carnahan-Starling-van der Waals model with a density-dependent parameter of a12. At a given temperature, the linear fit of the parameter of a12 and the density of the supercritical solvent was used for solubility correlation, resulting in an average absolute average relative deviation（AARD） of 8.68%, which was between the values of the semiempirical models and the other compressed gas models used in this article. In the linear fit of the parameter of a12 and the density of the solvent, the regressed slope m and intercept n of the linear fit can be correlated with the carbon atom number of solid n-alkanes and then the solubilities of solid n-alkanes in supercritical ethane can be predicted with the intercept n and slope m. The average AARD in solubility prediction was 26.99%.     

牛Ⅱ型链球菌van B2蛋白的原核表达及纯化

目的原核表达并纯化牛Ⅱ型链球菌(Streptococcus bovis biotypeⅡ)van B2蛋白。方法采用PCR法从牛Ⅱ型链球菌基因组DNA中扩增van B2基因,克隆至原核表达载体pET-28a(+)中,构建重组表达质粒pET-28a-van B2,转化大肠杆菌Rossata(DE3),IPTG诱导表达。表达的重组蛋白经Ni柱亲和层析纯化后,进行SDS-PAGE及Westernblot分析。结果 PCR扩增获得597 bp的van B2基因片段;重组表达质粒pET-28a-van B2经双酶切及测序证明构建正确;表达的重组van B2蛋白相对分子质量约为29 000,主要以可溶性形式表达;纯化的重组蛋白纯度为70%,可被小鼠抗牛链球菌血清Ⅱ型多克隆抗体特异性识别。结论原核表达并纯化了牛Ⅱ型链球菌van B2蛋白,为van B2基因的耐药性研究奠定了物质基础。