30Cr13不锈钢冶炼过程夹杂物控制技术

  针对30Cr13生产过程中存在的轧材非金属夹杂物合格率偏低仅85%左右的问题，通过对30Cr13不锈钢精炼过程钢中非金属夹杂物存在形态进行分析，并结合现有精炼工艺制度，在实验室研究的基础上制定了不锈钢精炼过程非金属夹杂物控制方案。工业应用后，精炼结束钢中大于5 μm的非金属夹杂物总数、形状以及尺寸等参数均得到了有效改善，钢水洁净度大大提高。     

准噶尔盆地吉木萨尔凹陷陆相页岩油地质特征与聚集机理

综合利用岩心、测井、烃源岩热解、铸体薄片、场发射扫描电镜、激光共聚焦显微镜与高压压汞等分析测试的结果，对准噶尔盆地吉木萨尔凹陷芦草沟组陆相页岩油地质特征与聚集机理进行了研究。结果表明：吉木萨尔凹陷咸化湖盆型沉积地层富含有机质，是烃源岩层也是储层，页岩油藏具有“源储一体”的地质特征，存在粉砂岩类与泥岩类和白云岩类与泥岩类两类岩性组合类型。芦草沟组大面积整体含油、“甜点”富集且原油成熟度较低。页岩油赋存岩石的润湿性为亲油性，生烃增压是页岩油运聚的主要动力。微纳米孔喉、层理缝与构造裂缝形成页岩油的有利储集空间与渗流通道。页岩油整体为源内或近源聚集，并以游离态和吸附态赋存于芦草沟组“甜点”段与泥页岩层段中。     

无取向电工钢冶炼过程氧含量控制

无取向硅钢的磁性能与钢的洁净度水平密切相关。为实现对无取向电工钢冶炼过程氧含量的合理控制,分析了无取向电工钢冶炼过程碳氧含量变化数据,热力学计算转炉终点临界碳含量与炉渣α_FeO。结果表明:随着转炉终点碳含量的降低,终点氧含量升高且波动范围大,合理出钢碳含量应控制为0.03%～0.05%;为满足炉渣中T.Fe≤24%的现场生产要求,终点碳含量应高于0.031%;钢包底吹氩气可有效降低钢液中过剩氧,降低钢液的平均碳氧积;据现场生产数据,RH精炼前理想碳、氧含量应控制为0.025%～0.035%和500×10^-6～650×10^-6,相应转炉终点碳含量控制为0.03%～0.04%。     

Synthesis and Characterization of Carbon Steel Corrosion Inhibitors Based on 4,5,6,7-tetrahydrobenzo[b]thiophene Scaffold

Protection of Metals and Physical Chemistry of Surfaces - Three novel inhibitors based on 4,5,6,7-tetrahydrobenzo[b]thiophene scaffold were synthesized and characterized. The inhibitive action of...     

A Thermo‐ and Moisture‐Responsive Zwitterionic Shape Memory Polymer for Novel Self‐Healable Wound Dressing Applications

Developing wound dressings that have strong adhesion strength without causing any conglutination to the wound site is still challenging. Herein, is proposed that zwitterionic shape memory polymers can be applied as promising candidates for wound dressing. Sulfobetaine methacrylate (SBMA) is copolymerized with 2,3‐dihydroxypropyl methacrylate (DHMA) in the presence of boric acid as a cross‐linking agent. The prepared material exhibits multi‐stimuli responsive shape memory behaviors: it can rapidly return to its initial shape upon heating to 90 °C, and a gradual recovery is also observed by absorbing moisture in humid environments. The shape memory effect can be well adjusted via incorporation of sodium chloride to induce the dissociation of electrostatic interactions between PSBMA chains, leading to reduced transition temperature and faster shape recovery rate. Moreover, the dynamic nature of boron ester bonds and electrostatic interaction endows the material with effective and rapid self‐healing ability. It is also demonstrated that the deployment process of the dressing that a sample with an initially circular shape can perfectly fit and tightly bind to the wound site after moisture‐induced shape recovery. The proposed zwitterionic polymer can possibly extend the application scope of shape memory polymers and pave a new way for the design of wound dressings.     

A Generalized Cubemap for Encoding 360° VR Videos using Polynomial Approximation

360^° VR videos provide users with an immersive visual experience. To encode 360^° VR videos, spherical pixels must be mapped onto a two‐dimensional domain to take advantage of the existing video encoding and storage standards. In VR industry, standard cubemap projection is the most widely used projection method for encoding 360^° VR videos. However, it exhibits pixel density variation at different regions due to projection distortion. We present a generalized algorithm to improve the efficiency of cubemap projection using polynomial approximation. In our algorithm, standard cubemap projection can be regarded as a special form with 1st‐order polynomial. Our experiments show that the generalized cubemap projection can significantly reduce the projection distortion using higher order polynomials. As a result, pixel distribution can be well balanced in the resulting 360^° VR videos. We use PSNR, S‐PSNR and CPP‐PSNR to evaluate the visual quality and the experimental results demonstrate promising performance improvement against standard cubemap projection and Google's equi‐angular cubemap.     

Open Source,Open Vision: The MakerPro Network and the Broadening of Participation in Setting Taiwan’s IT Vision Agenda

HCI recognizes the importance of visions as both a design and futuring approach and a problem-solving technique. One challenge of visioning work is who can propose and shape IT visions and how they can achieve the widespread buy-in needed to make them efficacious. In this paper, we focus on the potential of making, open design, and open manufacturing for contributing toward, if not fully achieving, the broadening of participation in IT envisioning. We use Taiwan’s MakerPro, a manufacturers and IT R&D community as a case to unpack what collective IT visioning looks like, how it shapes IT agendas concretely, and the implications for open design/open manufacturing research agenda in HCI. Our findings reveal how MakerPro members constructed and developed visions for open design and open manufacturing in Taiwan, obstacles to such visions, and how these obstacles can be collaboratively overcome through a participative and even democratic process. We also show that the collective purposiveness not only defines a regional vision agenda but also embraces an entire nation’s future.     

Design of switchable band‐notched frequency selective absorber

An active band‐notched frequency selective absorber (BNFSA) with switchable notch band is proposed in this article. The BNFSA is a two‐layer structure composed of a lossy layer at the top and a ground plane at the bottom, separated by an air spacer. The element of the lossy layer is a lumped‐resistor‐loaded metallic dipole with a parallel LC resonance structure, which is realized by complementary n‐shaped resonator (CnR) inserted in the center, and PIN diode is welded at two arms of CnR. The bias circuit printed on the back of the substrate of the lossy layer connects to anode and cathode of the diode by via hole and isolates by the inductor. Simulation results show that the notch bands are located at 4.50 and 6.81 GHz when the diode sets to ON and OFF, respectively. To validate the performance of switchable BNFSA, the prototypes are fabricated and measured, reasonable agreement between simulated and measured results is obtained.     

Relationship between the inductive response observed during electrochemical impedance measurements on aluminium and local corrosion processes

In situ real-time imaging and electrochemical impedance spectroscopy (EIS) measurements were performed on pure aluminium, aluminium-copper and copper electrodes, with the aim to elucidate the relationship between the shape of EIS spectra and the local processes occurring on the surface of corroding aluminium, with particular attention to the appearance of inductive behaviour. When a stable oxide was present on the aluminium surface, the impedance modulus increased with decreasing frequencies, indicating the absence of inductive behaviour. Conversely, the presence of depassivating condition coupled with the availability of some anodic current, generated localized corrosion and associated hydrogen evolution at the corrosion front (also known as superfluous hydrogen evolution). In these conditions, a clear inductive behaviour was observed, regardless on the source of the anodic current at the corrosion front, i.e. galvanic coupling or external anodic polarization.