The Development and Performance of a New Type of Environment Friendly None-Flowback Retarded Acid

Author(s):  
Jing Wang ◽  
Jian-xun Meng ◽  
Xiang-bin Liu ◽  
Qing-guo Wang ◽  
Xin-yue Zhang
2021 ◽  
Vol 2 (1) ◽  
pp. 46-62
Author(s):  
Santiago Iglesias-Baniela ◽  
Juan Vinagre-Ríos ◽  
José M. Pérez-Canosa

It is a well-known fact that the 1989 Exxon Valdez disaster caused the escort towing of laden tankers in many coastal areas of the world to become compulsory. In order to implement a new type of escort towing, specially designed to be employed in very adverse weather conditions, considerable changes in the hull form of escort tugs had to be made to improve their stability and performance. Since traditional winch and ropes technologies were only effective in calm waters, tugs had to be fitted with new devices. These improvements allowed the remodeled tugs to counterbalance the strong forces generated by the maneuvers in open waters. The aim of this paper is to perform a comprehensive literature review of the new high-performance automatic dynamic winches. Furthermore, a thorough analysis of the best available technologies regarding towline, essential to properly exploit the new winches, will be carried out. Through this review, the way in which the escort towing industry has faced this technological challenge is shown.


Author(s):  
Xiaowei Fan ◽  
Fang Wang ◽  
Huifan Zheng ◽  
Xianping Zhang ◽  
Di Xu

The refrigerant mixtures provide an important direction in selecting new environment-friendly alternative to match the desirable properties with the existing halogenated refrigerants or future use in the new devices, in which, HFCs refrigerants with zero ODP combined with HCs refrigerants with zero ODP and lower GWP are of important value in the fields of application. In the present work, research on HFC125/HC290 (25/75 by mass) binary refrigerant mixture used in heat pumps was carried out, and parameters, factors affecting the performance were investigated, and compared with that of HCFC22 under the same operating conditions. It has been found that the new mixture can improve the actual COP by 2 to 13% and hence it can reduce the energy consumption by 20 to 31.5%. The overall performance has proved that the new refrigerant mixture could be a promising substitute for HCFC22.


2018 ◽  
Vol 25 (6) ◽  
pp. 1059-1073 ◽  
Author(s):  
Weifeng Chen ◽  
Hu Weimin ◽  
Dejiang Li ◽  
Shaona Chen ◽  
Zhongxu Dai

AbstractGraphene (graphene) is a new type of two-dimensional inorganic nanomaterial developed in recent years. It can be used as an ideal inorganic nanofiller for the preparation of polymer nanocomposites because of its high mechanical strength, excellent electrical conductivity and plentiful availability (from graphite). In this review, the preparation methods of graphene/polymer nanocomposites, including solution blending, melt blending and in situ polymerization, are introduced in order to study the relationship between these methods and the final characteristics and properties. Each method has an influence on the final characteristics and properties of the nanocomposites. The advantages and disadvantages of these methods are discussed. In addition, a variety of nanocomposites with different properties, such as mechanical properties, electronic conductivity, thermal conductivity and thermal properties, are summarized comprehensively. The potential applications of these nanocomposites in conductive materials, electromagnetic shielding materials, photocatalytic materials and so on, are briefly presented. This review demonstrates that polymer/graphene nanocomposites exhibit superior comprehensive performance and will be applied in the fields of new materials and novel devices. Future research directions of the nanocomposites are also presented.


Author(s):  
Tan Sooi Beng

Popular Malay music developed in Malaya in tandem with socio-political transformations which took place as a result of British colonialism. It was at this time that a new type of local commodified urban popular music known as lagu Melayu (Malay song) emerged to entertain the multiethnic urban audiences from different social and class backgrounds. This new music was shaped by the convergence of the new social conditions, technology such as print, gramophone, radio, film, microphones, cultural forms, and performance sites that emerged. By examining the song styles and texts of 78 rpm recordings of Lagu Melayu, oral interviews with performers, and published texts of the colonial period, this chapter illustrates how the new popular music accorded women performing artists voice and agency to negotiate dominant discourses regarding modern colonial subjectivity and gender. Women singers promoted a type of vernacular modernity that was not defined solely in European terms butwas characterized by continuity, difference, and hybridity. The musical recordings and stories of their lives reveal the complex polyvocal and sometimes contradictory experiences of women performers in colonial Malaya.


Author(s):  
Xueting Liu ◽  
Yue Tian ◽  
Dan Wei ◽  
Jincheng Liu

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