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Mannich reaction catalyzed by a novel catalyst under solvent-free conditions
Cai Bo Yue,Ting Feng Yi,Chuan Bing Zhu,Gang Liu 한국공업화학회 2009 Journal of Industrial and Engineering Chemistry Vol.15 No.5
An acidic catalyst [Py][CF3COO] (pyridinium trifluoroacetate) was synthesized and used in the Mannich reaction of various kinds of aromatic aldehydes, aromatic ketones and aromatic amines. b-Amino carbonyl compounds were obtained in reasonable yields when the Mannich reaction was carried out at room temperature under solvent-free conditions. The products could be separated from the catalyst simply via washing with water and after removing water, the catalyst could be recycled and reused for up to four times without noticeably decreasing in catalytic activity.
Cai, Rong-Gen,Qi, Yong-Hui,Wu, Yue-Liang,Zhang, Yun-Long American Physical Society 2017 Physical Review D Vol.95 No.12
<P>The (2 + 1)-dimensional non-Fermi liquid (NFL) has a dual description in the (3 + 1)-dimensional anti-de Sitter (AdS) spacetime. We begin with a dyonic Reissner-Nordstrom (RN) black brane background, and consider the bulk Dirac fermion field coupled with the background U(1) gauge field, as well an intrinsic axial gauge field which is induced by chiral anomaly. The axial gauge field is effectively induced from the topological term in the bulk, which would lead to nontrivial effects on the boundary NFL. We study these effects through calculating the retarded Green's functions of the dual NFL holographically, in both analytical and numerical approaches. We also obtain correlation functions in the low frequency limit at zero and finite temperatures, as well as the dispersion spectrum of the Dirac cones, Fermi arc of the surface states, which can be related with the experiment.</P>
Cai Yongxiang,Xiao Xiaobing,Li Yue,He Xiaomeng,He Xinyi,Huang Boyang 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.5
Promoting the full utilization of renewable energy and increasing the penetration rate of renewable energy in distribution network areas are important requirements for the development of low-carbon power systems. This paper analyzes the interest structure of each subject in the distributed wind and solar power area, constructs a multi-area wind and solar energy sharing framework, and establishes a cross-area energy transmission model considering the area topology structure. This paper uses Nash negotiation theory to design a multi-area photovoltaic energy transmission trading mechanism, which decomposes the trading problem into two sub-problems: maximizing the overall benefi t and allocating the cooperative benefi t among areas. Considering the limitation of large-scale information transmission among areas, an alternating multiplier method with less information requirement is adopted for distributed solving. The results presented demonstrate that the energy transfer model and trading mechanism proposed in this paper achieve optimal scheduling of cross-terrace wind energy, effi ciently utilize network distribution capacity, decrease terrace operating costs, boost wind user revenue, and promote the maximization of renewable energy utilization. Compared to the scenario of no energy sharing, the approach presented in this paper has the potential to decrease distribution network operation expenses by as much as 57.5% and bolster the utilization rate of renewable energy by 13.9%.
Investigation of Eco-friendly Dyeing of Para-aramid Using Supercritical CO2
Yue Zhang,Huanda Zheng,Laijiu Zheng,Tao Cai,Fuer Zheng 한국섬유공학회 2022 Fibers and polymers Vol.23 No.8
In order to solve the problems of dyeing difficulty and serious pollution of traditional water-based dyeing of paraaramid,supercritical CO2 fluid was employed as a dyeing solvent to dye para-aramid yarn (temperatures 80-120 ℃, pressures16-24 MPa, dyeing time 15-90 min, and dye concentration 1 %-7 % o.m.f.). The K/S values reached 2.07 and 1.91 at 120 ℃,24 MPa, 60 min, 5 % o.m.f., and a CO2 flow of 20 g/min with C. I. Disperse Red 54 and C. I. Disperse Blue 79, respectively. The results proved that para-aramid yarn could be dyed in supercritical CO2 fluid. Moreover, the thermal and mechanicalproperties of dyed para-aramid yarns in supercritical CO2 showed a slightly increasing trend. The washing, rubbing, and thelight color fastness of the dyed samples were rated above 4-5, and the color fastness durability of the dyed para-aramid wasalso presented good.
Research on Dynamic Characteristics of Hard Cutting System
Yue Caixu,Fenghuize,Cai Chunbin,Zhang Haitao,Huang Cui 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.3
Tool wear is an inevitable and continuously aggravated process in precision hard cutting. Interaction between tool wear and dynamic characteristics in cutting system makes the machining accuracy and quality of machined surface declining, which effects dynamic characteristics of cutting system deteriorated significantly. Based on this, cutter dynamic modal parameters of a specific cutting system are measured in this paper. Cutting force and change law of acceleration power spectrum are studied by experiments. Influence mechanism of tool wear on system frequency energy distribution was obtained. The cutting system dynamic characteristics are quantified by establishing simulation model. Root locus plot of non-uniform load distribution is obtained and the minimum stiffness ratio in the root locus plot is determined. The effect of tool flank wear on cutting system stability in quantitatively stable is researched.The results can provide a theoretical basis for the selection of reasonable selection of stable precision cutting conditions in different tool wear conditions.
Analysis of Port Hopping for Proactive Cyber Defense
Yue-Bin Luo,Bao-Sheng Wang,Gui-Lin Cai 보안공학연구지원센터 2015 International Journal of Security and Its Applicat Vol.9 No.2
Port hopping is a typical proactive cyber defense technology, which hides the service identity and confuses attackers during reconnaissance by constantly altering service ports. Although several kinds of port hopping mechanisms have been proposed and implemented, but it is still unknown how effective port hopping is and under what circumstances it is a viable moving target defense because the existed works are limited and they usually discuss only a few parameters. Besides, in many cases the defense effectiveness has been studied empirically. In order to have an insight into the effectiveness of port hopping, this paper introduces a quantitative analysis based on the urn model, which quantifies the probability of attacker success in terms of port pool size, number of probes, number of vulnerable services, and hopping frequency. Theoretical analysis shows that port hopping is an effective and promising proactive defense technology in thwarting cyber attacks.
Wencong Yue,Yanpeng Cai,Linyu Xu,Xumei Wang,Qiangqiang Rong,Lin Liu 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.6
Due to population growth and economic development, water demands for municipal, industrial, and agricultural users are increasing. It is a challenging and critical issue in water resources system to properly allocate and utilize water resources to satisfy the goals of different stakeholders and greenhouse gases mitigation. In this study, a hybrid life-cycle analysis and two-stage stochastic programming model was proposed to analyze the water-allocation strategies based on complicated urban water resource system. The hybrid model can effectively assess the low-carbon performance of an urban water resources system in the framework of life-cycle analysis. The environmental impacts and GHGs reduction of urban water resources were firstly considered as the objective and constraint for solving the water allocation problems. The results indicated that the first-stage solutions of surface water conveyance of Dalian could be [3.83×108, 8.25×108] in 2015, and [3.83×108, 9.21×108] in 2020; Meanwhile, the first-stage solutions of surface water conveyance of Dalian could be [4.26×108, 8.68×108] in 2015, and [5.35×108, 10.7×108] in 2020.
Biosynthetic Pathway of Carotenoids in Rhodotorula and Strategies for Enhanced Their Production
( Wei Tang ),( Yue Wang ),( Jun Zhang ),( Yali Cai ),( Zengguo He ) 한국미생물생명공학회(구 한국산업미생물학회) 2019 Journal of microbiology and biotechnology Vol.29 No.4
Rhodotorula is a group of pigment-producing yeasts well known for its intracellular biosynthesis of carotenoids such as β-carotene, γ-carotene, torulene and torularhodin. The great potential of carotenoids in applications in food and feed as well as in health products and cosmetics has generated a market value expected to reach over $2.0 billion by 2022. Due to growing public concern over food safety, the demand for natural carotenoids is rising, and this trend significantly encourages the use of microbial fermentation for natural carotenoid production. This review covers the biological properties of carotenoids and the most recent findings on the carotenoid biosynthetic pathway, as well as strategies for the metabolic engineering methods for the enhancement of carotenoid production by Rhodotorula. The practical approaches to improving carotenoid yields, which have been facilitated by advancements in strain work as well as the optimization of media and fermentation conditions, were summarized respectively.