Design Thinking

Abstract

This article uses Mikhail Bakhtin and Homi K. Bhabha's notions of hybridity as an interpretive tool in a traditional market area situated to the north of the center of Calcutta called Barabazaar or the Great Bazaar. More specifically, I study the changing effects of colonialization and globalization on a small group of Marwari paper traders in an area at the southern end of Barabazaar called China Bazaar. Acknowledging the overlapping geographies, both indigenous and foreign, that were and are constantly negotiated in places such as Barabazaar, I define a concept of hybrid space.     

半水磷石膏参与固化原状磷石膏制备复合胶凝材料

利用半水磷石膏（HPG）协同灰钙粉和水泥固化原状磷石膏（RPG）制备磷石膏基复合胶凝材料（PBCM）。采用单因素实验探究了HPG掺量对PBCM浆体性能的影响,并通过正交实验进一步探究各掺合料对PBCM强度及耐水性的影响。结果表明：HPG可作为RPG的固化材料,既高效又环保,掺量在20%（质量分数,下同）以上的HPG可彻底解决PBCM浆体的泌水问题,显著缩短浆体凝结时间,掺量在40%以上的HPG可有效改善浆体流动性;HPG、灰钙粉和水泥可有效提高PBCM强度,其中水泥对耐水性影响显著。微观形貌分析显示,PBCM的主要水化物二水硫酸钙和钙矾石晶体交织生长于RPG晶体之间,从而实现了对RPG的有效固化。     

半水磷石膏固化原状磷石膏制备胶凝材料及性能研究

以原状磷石膏（RPG）为基材,通过单因素实验研究了原状磷石膏（RPG）与β-半水磷石膏（HPG）相对掺量以及生石灰、水泥、硅灰3种掺合料对磷石膏基复合胶凝材料（PGBM）抗压强度、抗折强度及软化系数的影响规律以及作用机理。结果表明：HPG、生石灰、水泥、硅灰相对掺量的增加均能有效提高PGBM的强度及软化系数,其中硅灰的作用最为明显。但是,当生石灰和水泥的掺量（以质量分数计）分别大于4%和6%时,对PGBM耐水性能的改善不明显。当RPG与HPG相对掺量（质量分数比）为7∶3,生石灰、水泥、硅灰掺量（以质量分数计）分别为4%、12%、5%时,试件28 d抗压强度和软化系数分别可以达到26.29 MPa和0.79。微观分析表明：各掺合料主要通过水化产物填充率影响RPG颗粒之间的接触强度,进而对PGBM的强度和耐水性产生影响。     

Study of the influence of a boric–sorbitol complex on Zn–Mn electrodeposition and on the morphology, chemical composition, and structure of the deposits

Zn–Mn electrodeposition onto Pt from an electrolyte containing boric–sorbitol complex (BSC) or boric acid alone (BA) was studied. The influence of BA or BSC content on the deposition process was investigated by cyclic voltammetry and electrodeposits, produced potentiostatically, were analysed by SEM, EDX, and XRD. The voltammetric studies indicated that an increase in the BSC concentration led to a decrease in the deposition current density. EDX analysis of deposits obtained at −1.60 V showed that increasing the BA or BSC concentration in the bath induced a fall in the Mn content of the electrodeposit and that for BSC this decrease was more significant. SEM images showed that the Zn–Mn electrodeposit obtained in the presence of 0.24 M BSC were smoother than other deposits; hence, BSC acted as a grain refiner at this concentration. XRD analysis of this deposit indicated that it was composed of Zn, Mn, MnZn₁₃, and MnH_0.8.     

The Planck mass as a function of extra space volume

It is shown that, in the framework of multidimensional gravity, the Planck mass depends on the geometry of a compact extra space. Talk given at the International Conference RUSGRAV-13, June 23–28, 2008, PFUR, Moscow.     

InAlA5量子点材料的AFM和拉曼散射研究

对分子束外延（MBE）自组织生长的InAlAs量子点材料进行了拉曼散射实验。结合原子力显微镜（AnD对量子点形貌观察的结果，分析了InAlAs量子点生长过程中尺寸、密度和均匀性的改变，并研究了三维岛的结构对拉曼谱线的影响。对InAlAs淀积厚度不同样品的拉曼谱分析表明，岛状结构的尺寸横纵比与类GaAsLO模和类AlAs LO模的半高全宽有密切关系。不同偏振下的拉曼实验证实了该结构中的光学声子在Z（X,X）Z偏振条件下为非拉曼活性。     

Evaluation of various slip estimation techniques for an inductionmachine operating under field-oriented control conditions

Six published methods of rotor slip estimation for sensorless speed control were evaluated using simulated data. Only two of these showed signs of being usable. Both are based on the steady-state machine model and produce a fair slip accuracy for a machine running under perfect field alignment conditions. It was not determined whether the other four techniques were unsuccessful because they require a closed-loop speed controller, were presented incorrectly in the literature, or contain fundamental deficiencies. On the basis of these evaluations, a new technique was developed, and both measured and predicted results are presented to show that it works well. Moreover, this new technique has many features that make it theoretically and practically more attractive than most existing techniques