阳极氧化工艺条件对氮化钽烧结体电性能的影响

用纳米氮化钽粉末烧结制备了氮化钽烧结体,分析了烧结体的物相结构,研究了形成液种类、形成液浓度、温度、电流密度以及赋能电压等条件对氮化钽阳极氧化膜电性能的影响。结果表明,该烧结体是由纯氮化钽组成的,氮化钽阳极块体阳极氧化过程的最佳赋能工艺:磷酸溶液浓度0.01%,形成液温度55℃,电流密度40mA/g,形成电压小于16V。     

5G通信技术在智能协同中的应用

5G通信技术的高速率、低延迟、大带宽等特性,极大地提高了实时通信效率和协同协作能力,从而促进了智能协同的发展。同时,5G通信技术也能提高通信的安全性、稳定性和智能处理能力,适用于各个领域的智能协同。文中从5G通信技术与智能协同概念入手,探讨了5G通信技术在智能协同中的应用价值,分析了5G通信技术在智能协同中的关键技术,并具体阐述了5G通信技术在智慧城市建设、智慧交通系统和智慧医疗系统等方面的应用,以供参考。     

Compiler compatible 5.66 Mb/mm2 8T 1R1W register file in 14 nm FinFET technology

1-read/1-write (1R1W) register file (RF) is a popular memory configuration in modern feature rich SoCs requiring significant amount of embedded memory. A memory compiler is constructed using the 8T RF bitcell spanning a range of instances from 32 b to 72 Kb. An 8T low-leakage bitcell of 0.106 μm² is used in a 14 nm FinFET technology with a 70 nm contacted gate pitch for high-density (HD) two-port (TP) RF memory compiler which achieves 5.66 Mb/mm² array density for a 72 Kb array which is the highest reported density in 14 nm FinFET technology. The density improvement is achieved by using techniques such as leaf-cell optimization (eliminating transistors), better architectural planning, top level connectivity through leaf-cell abutment and minimizing the number of unique leaf-cells. These techniques are fully compatible with memory compiler usage over the required span. Leakage power is minimized by using power-switches without degrading the density mentioned above. Self-induced supply voltage collapse technique is applied for write and a four stack static keeper is used for read Vmin improvement. Fabricated test chips using 14 nm process have demonstrated 2.33 GHz performance at 1.1 V/25 °C operation. Overall V_min of 550 mV is achieved with this design at 25 °C. The inbuilt power-switch improves leakage power by 12x in simulation. Approximately 8% die area of a leading 14 nm SoC in commercialization is occupied by these compiled RF instances.     

利用遗传编程排序图像

Web image retrieval is a challenging task. One central problem of web image retrieval is to rank a set of images according to how well they meet the user information need. The problem of learning to rank has inspired numerous approaches to resolve it in the text information retrieval, related work for web image retrieval, however, are still limited. We focus on the problem of learning to rank images for web image retrieval, and propose a novel ranking model, which employs a genetic programming architecture to automatically generate an effective ranking function, by combining various types of evidences in web image retrieval, including text information, image visual content features, link structure analysis and temporal information. The experimental results show that the proposed algorithms are capable of learning effective ranking functions for web image retrieval. Significant improvement in relevancy obtained, in comparison to some other well-known ranking techniques, in terms of MAP, NDCG@n and D@n.     

基于熔融拉锥过耦合器的光纤光栅解调系统

提出了一种基于光纤熔融拉锥过耦合器进行解调的方法,实验制作了一个特殊的熔融拉锥过耦合器,对其输出的两路光功率进行了测试,并论证了用该耦合器进行解调的原理.利用该过耦合器组成的检测系统对光纤光栅传感器进行解调,得到了较好的响应.该解调方法成本低,结构简单,解调范围大,线性范围可达10 nm以上.     

Auto-microfluidic thin-film chip for genetically modified maize detection

As a thin-film chip method, reverse dot blot hybridization (RDBH) has been employed to detect hazardous substances, but an automatic RDBH instrument with low workload, high accuracy and stability is still urgently needed. This paper presents our newly-developed auto-microfluidic thin-film chip (AMTC) method for multiplex screening of genetically modified (GM) maize. With specific DNA probes for genetically modified (GM) maize being immobilized on a square nylon thin-film, it was placed into a micro-reaction cell of the AMTC device. Then biotin-labeled PCR products with target DNA fragments for template amplification were added to the micro-reaction cell using a microfluidic system. When the PCR products passed the square nylon thin-film, the target DNA fragments were captured by the complementary action of DNA, where the signal was visualized with streptavidin link-coupled alkaline phosphatase color development kit. The sensitivity of GM maize detection reached 0.1% quality percentage and its stability and consistency could satisfy the requirements for practical applications. Performance advantages of the ATMC are manifold, being embodied in aspects such as easy and straightforward operation, low costs and less workload.     

Influence of nickel content on the chemical bonding character of LiMn2−xNixO4 spinel oxides

A relationship between the chemical bonding nature of LiMn_2−xNi_xO₄ and the Ni content has been systematically investigated. According to X-ray diffraction analysis, nickel-substituted lithium manganates crystallize with a cubic spinel structure without the formation of any impurity phase such as NiO in the present substitution range of 0 ≤ x ≤ 0.4. Micro-Raman analysis showed that Ni substitution gave rise to an increase in the intensities and energies of the two main phonon lines at ∼580 and ∼620 cm⁻¹, indicating enhancement of the average Mn oxidation states and reinforcement of the MnO bonds. This was confirmed by Mn K-edge X-ray absorption spectroscopic (XAS) analysis. Also, a new phonon line appeared at ∼495 cm⁻¹ after the Ni substitution, which can be assigned as an Ni–O vibration mode rather than as a T_2g(2) mode of LiMn₂O₄. Ni K-edge XAS and micro-Raman analyses clearly demonstrate that divalent nickel ions existed in the octahedral sites of the cubic spinel lattice without a significant change in the chemical environment with the Ni content. In this regard, the poor electrochemical performance of heavily Ni-substituted compounds for the 3 V region is not attributable to the variation in the local environment of Ni ions with the Ni content, but to the low structural stability of the substituted NiO₆ octahedra.     

济钢顶燃式热风炉烟气分布研究

运用CFD软件对卡鲁金热风炉和ZSD热风炉的气体燃烧和流动进行了数值模拟,得到燃烧室出口烟气速度的分布,并对卡鲁金热风炉燃烧室出口烟气的压力和温度分布进行了测试,分析了两种炉型燃烧室的结构特点。结果表明,卡鲁金热风炉燃烧室出口烟气分布的均匀程度大大高于传统的ZSD热风炉,其结构特点对ZSD热风炉的改造有很大的参考价值。     

VAI大板坯连铸机水平段频繁损坏分析及改造措施

针对VAI大板坯连铸机大断面改造后出现水平段频繁损坏情况，分析确定其损坏原因为水平段内弧辊子外部冷却设计，已不能满足高拉速下浇注大断面的冷却要求，导致辊子轴承过热损坏。将水平段内弧辊子外部冷却改为冶金冷却，显著提高水平段使用寿命，部分改善铸坯质量，保证铸机高效生产顺利进行。