检索结果-南通市图书馆

Pyrometallurgical recycling of stainless steel pickling sludge: a review

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2019年第6期26卷 547-557页

作者： cong-cong Yang Jian Pan De-qing Zhu Zheng-qi Guo Xiao-ming Li School of Minerals Processing and Bioengineering Central South University Changsha 410083 Hunan China School of Metallurgical Engineering Xi'an University of Architecture and Technology Xi'an 710055 Shaanxi China

Stainless steel pickling sludge (SSPS), generated from the lime neutralization process of spent pickling liquor, is classified as a hazardous waste consisting of abundant metals like Fe, Cr and Ni, and other elements like F, S and Na, etc. Rather than a common disposal in landfill, recovering these metals and other valuable components from SSPS can not only create economic benefits, but also eliminate its adverse impacts on human health and the environment. A review of the formation mechanism and basic properties of SSPS was made, and the technical features, advantages and limitations of a series of pyrometallurgical treatment processes were summarized. Based on these, the main challenges for recycling of SSPS through the existing techniques are demonstrated. The traditional pelletizing/sintering-blast furnace process can only be used as a partial solution. Direct use of SSPS as flux in an argon-oxygen decarburization converter or electric arc furnace is a promising way, but low S sludges are preferred. The STAR process shows excellent recovery for metals, but it also has a low tolerance to the S and F contents in SSPS. And theINMETCO process is highly flexible in treatment of various wastes, whereas it exhibits relatively low Cr recovery and produces poor-quality pig iron. In addition, the feasibility of the rotary kiln-electric furnace, solid -state reduction of chromite and reduction-magnetic separation processes requires further studies. An urgent task at present is to develop a system for scientific classification and separate collection of SSPS in terms of chemical composition, notably S and F contents.

关键词： Stainless steel pickling sludge Hazardous waste Recycling Pyrometallurgical process Reduction Recovery

WAEAS:An Optimization Scheme of EAS Scheduler for Wearable Applications

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Tsinghua Science and Technology 2021年第1期26卷 72-84页

作者： zhan zhang Xiang cong Wei Feng Haipeng zhang Guodong Fu Jianyun Chen the School of Computer Science and Technology Harbin Institute of TechnologyHarbin 150001China Beijing Information Technology Institute Beijing 100192China

The rapid development of wearable computing technologies has led to an increased involvement of wearable devices in the daily lives of *** main power sources of wearable devices are batteries;so,researchers must ensure high performance while reducing power consumption and improving the battery life of wearable *** purpose of this study is to analyze the new features of an Energy-Aware Scheduler(EAS)in the Android 7.1.2 operating system and the scarcity of EAS schedulers in wearable application ***,the paper proposed an optimization scheme of EAS scheduler for wearable applications(Wearable-Application-optimized Energy-Aware Scheduler(WAEAS)).This scheme improves the accuracy of task workload prediction,the energy efficiency of central processing unit core selection,and the load *** experimental results presented in this paper have verified the effectiveness of a WAEAS scheduler.

关键词： wearable devices heterogeneous multicore system big.LITTLE architecture task scheduling

Stochastic Analysis of Short-Term Structural Responses and Fatigue Damages of A Submerged Tension Leg Platform Wind Turbine in Wind and Waves

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2021年第4期35卷 566-577页

作者： HAN Yan-qing LE cong-huan zhanG Pu-yang DANG Li FAN qing-lai School of Civil Engineering Ludong UniversityYantai 264025China State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China School of Civil Engineering Tianjin UniversityTianjin 300072China Institution of Cross-sea Engineering Ludong UniversityYantai 264025China

In connection with the design of floating wind turbines,stochastic dynamic analysis is a critical task considering nonlinear wind and wave *** study the random structural responses of a newly designed submerged tension leg platform(STLP)wind turbine,a set of dynamic simulations and comparison analysis with the MIT/NREL TLP wind turbine are carried *** signal filter method is used to evaluate the mean and standard deviations of the structural ***,the extreme responses are estimated by using the mean upcrossing rate *** fatigue damages for blade root,tower,and mooring line are also studied according to the simulated *** results and comparison analysis show that the STLP gives small surge and pitch motions and mooring line tensions in operational sea states due to the small water-plane ***,in severe sea states,the STLP gives lower extreme values of platform pitch,slightly larger surge and heave motions and better towerbase and mooring line fatigue performances than those of the MIT/NREL *** is found that the STLP wind turbine has good performances in structural responses and could be a potential type for exploiting the wind resources located in deep waters.

关键词： stochastic analysis signal filter mean upcrossing rate fatigue damage equivalent load

Development of small pixel HgCdTe infrared detectors

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2019年第3期28卷 17-25页

作者： Ming Liu cong Wang Li-qing Zhou North China Research Institute of Electroptics Beijing 100015China

After approximately half a century of development, HgCdTe infrared detectors have become the first choice for high performance infrared detectors, which are widely used in various industry sectors, including military tracking, military reconnaissance, infrared guidance, infrared warning, weather forecasting, and resource detection. Further development in infrared applications requires future HgCdTe infrared detectors to exhibit features such as larger focal plane array format and thus higher imaging resolution. An effective approach to develop HgCdTe infrared detectors with a larger array format size is to develop the small pixel technology. In this article, we present a review on the developmental history and current status of small pixel technology for HgCdTe infrared detectors, as well as the main challenges and potential solutions in developing this technology. It is predicted that the pixel size of long-wave HgCdTe infrared detectors can be reduced to5 μm, while that of mid-wave HgCdTe infrared detectors can be reduced to 3 μm. Although significant progress has been made in this area, the development of small pixel technology for HgCdTe infrared detectors still faces significant challenges such as flip-chip bonding, interconnection, and charge processing capacity of readout circuits. Various approaches have been proposed to address these challenges, including three-dimensional stacking integration and readout circuits based on microelectromechanical systems.

关键词： HgCdTe infrared detector small size pixel readout circuit

Wave Dissipation Characteristics of A Mountain-Type Breakwater

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2020年第6期34卷 863-870页

作者： GONG Ye-jun zhan Jie-min HU Wen-qing FAN qing CAI Wen-hao MOE-LCSM School of Mathematics and StatisticsHunan Normal UniversityChangsha 410081China Department of Applied Mechanics and Engineering Sun Yat-sen UniversityGuangzhou 510275China

One mountain-type breakwater consisting of two inclined plates and one vertical plate is proposed based on several types of traditional free surface breakwaters, including the horizontal plate, curtain wall, and trapezoidal barriers. The interaction between the regular waves and the fixed free surface mountain-type breakwater is measured in one wave flume(15.0 m×0.6 m×0.7 m). The wave propagation, reflection, and transmission process are simulated using the VOF method and the hybrid SAS/laminar method. The simulated wave profiles are consistent with the experimental observations. For waves with a length smaller than four times width of the mountain-type breakwater, the reflected wave amplitudes are slightly larger than those of the vertical-plate breakwater, while the wave transmission coefficients are all smaller than 0.5, and the wave loss coefficients are larger than 0.7. The wave energy is dissipated by wave breaking on the windward inclined plate, and turbulent flow around the vertical plate and the leeward inclined plate.

关键词： wave-structure interaction mountain-type breakwater free surface breakwater

The Stable Explicit Time Stepping Analysis with a New Enrichment Scheme by XFEM

在线全文

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2017年第3期53卷 187-206页

作者： Xue-cong Liu qing zhang Xiao-zhou Xia Department of Engineering Mechanics Hohai UniversityNanjing 211100P R China

This paper focuses on the study of the stability of explicit time integration algorithm for dynamic problem by the Extended Finite Element Method(XFEM).A new enrichment scheme of crack tip is proposed within the framework of *** the governing equations are derived and evolved into the discretized *** dynamic problem,the lumped mass and the explicit time algorithm are *** different grid densities and different forms of Newmark scheme,the Dynamic Stress Intensity Factor(DSIF)is computed by using interaction integral approach to reflect the dynamic *** effectiveness of the proposed scheme is demonstrated through the numerical examples,and the critical time stepping in different situations are listed and analyzed to illustrate the factors that affect the numerical stability.

关键词： XFEM DSIF Newmark scheme time stepping stability

The Stable Explicit Time Stepping Analysis with a New Enrichment Scheme by XFEM

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computer Modeling in Engineering & Sciences 2017年第4期113卷 411-427页

作者： Xue-cong Liu qing zhang Xiao-zhou Xia Department of Engineering Mechanics Hohai UniversityNo.8 Focheng West RoadNanjing 210098China

关键词： XFEM DSIF newmark scheme time stepping stability

Electronic properties of one-dimensional systems with long-range correlated binary potentials

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2011年第8期20卷 335-339页

作者： Gong Long-Yan Tong Pei-qing Zhou Zi-cong College of Science Nanjing University of Posts and Telecommunications Nanjing 210003 China Department of Physics Nanjing Normal University Nanjing 210097 China Department of Physics Tamkang University 151 Ying-Chuan Tamsui 25137 Taipei Taiwan China

We study numerically the electronic properties of one-dimensional systems with long-range correlated binary potentials. The potentials are mapped from binary sequences with a power-law power spectrum over the entire frequency range, which is characterized by correlation exponent β. We find the localization length ζ increases withβ. At system sizes N →∞, there are no extended states. However, there exists a transition at a threshold ζ. Whenβ 〉 βc, we obtain ζ 〉 0. On the other hand, at finite system sizes, ζ≥ N may happen at certain β, which makes the system ＂metallic＂, and the upper-bound system size N＊（β） is given.

关键词： electronic properties long-range correlation binary potentials localization

Nanofibers of Silk Fibroin Controlled by the Crystallization of Polyethylene Glycol in Frozen Solution

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Polymer Science 2017年第11期35卷 1373-1380页

作者： cong-heng Chen Juan Zhao Zhou Yang qing Sun 周平 State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceFudan University

The conformation of silk fibroin （SF） frozen with polyethylene glycol （PEG） at a molecular weight from 2 kDa to 20 kDa and a mass ratio of PEG：SF from 1：5 to 10：1 was studied by spectral and microscopic methods. It is found that the conformation transition of SF from random coil to β-sheet could be induced by the stress resulting from PEG crystallization at -20 ℃, and greatly depended on the cooling rate, PEG：SF mass ratio and PEG molecular weight. These findings provide a new method for the preparation of desired SF nanofibers.

关键词： Silk fibroin Polyethylene glycol Freezing Phase separation Crystallization