FR
FR的相关文献在1983年到2022年内共计318篇,主要集中在无线电电子学、电信技术、自动化技术、计算机技术、化学工业
等领域,其中期刊论文76篇、会议论文2篇、专利文献240篇;相关期刊70种,包括现代企业教育、现代商贸工业、张家口职业技术学院学报等;
相关会议2种,包括第五届中国美容与整形医师大会、第十届全国多媒体技术学术会议等;FR的相关文献由654位作者贡献,包括邓子新、周秀芬、陈实等。
FR
-研究学者
- 邓子新
- 周秀芬
- 陈实
- 别一
- 李振兴
- 翁汉琍
- 朱旭亮
- 袁建栋
- 高兴元
- 万毅
- 何清
- 刘峰
- 廖成
- 张国勇
- 戴维·R·威尔森
- 拉维·B·尚卡尔
- 杨亮
- 王树华
- 王树恒
- 王树领
- 王瑞珍
- 王胜
- 罗维
- 阮羚
- 陈恩禄
- 韩特警
- 黄景光
- 付军亮
- 付静
- 何宏
- 刘俊秀
- 叶建锋
- 周培峰
- 宋立果
- 左幼林
- 张大伟
- 曾昭峰
- 朱进伟
- 杨殷诚
- 王伟
- 秦伟峰
- 路伟征
- 邵善玉
- 郑宝林
- 郑玲辉
- 陈世敏
- 陈长浩
- 鲁莽
- H.W.霍伊尔
- H.弗兰森
-
-
Sankarsan Tarai;
Jagadish Kumar
-
-
摘要:
We report a viable exponential gravity model for the accelerated expansion of the universe in Bianchi VIh space-time. By considering the estimated physical parameters, the cosmological models are constructed and analyzed in detail. We found that the state parameter in both the models increases to a higher negative range in an early epoch of the phantom domain and it goes to the positive domain at a late phase of the evolution. The effective cosmological constant remains in a positive domain for both models, which is a good sign of accelerating expansion of the universe.
-
-
张威1
-
-
摘要:
雷沃工程机械集团敏锐地感触到中国市场的变化——客户对产品工况适应性、绿色环保及服务等方面提出了更高、更个性化的需求。随着中国工程机械市场在低谷中回暖复苏,雷沃工程机械集团敏锐地感触到中国市场的变化——客户对产品工况适应性、绿色环保及服务等方面提出了更高、更个性化的需求。雷沃工程机械集团通过不断推出满足客户需求的产品,受到用户的称赞。2017年,雷沃推出了无尾微挖FR18E-u,其底盘伸缩、多功能属具切换等功能契合了中国城市化发展的浪潮。面世两年来,销量节节攀升。
-
-
-
-
-
-
Peter K. F. Kuhfittig
-
-
摘要:
The starting point in this note is f(R) modified gravity in a cosmological setting. We assume a spatially flat universe to describe late-time cosmology and the perfect-fluid equation of state to model the hypothesized dark energy. Given that on a cosmological scale, f(R) modified gravity must remain close to Einstein gravity to be consistent with observation, it was concluded that either (1) Einstein’s cosmological constant was the only acceptable model for the accelerated expansion, or that (2) the equation of state for dark energy was far more complicated than the perfect-fluid model and might even exclude a constant w.
-
-
Hamidreza Saiedi
-
-
摘要:
In the context of modified gravity theory, we study time-dependent wormhole spacetimes in the radiation background. In this framework, we attempt to generalize the thermodynamic properties of time-dependent wormholes in gravity. Finally, at event horizon, the rate of change of total entropy has been discussed.
-
-
Donghua Gu;
Zhenyu Han;
Qing’e Wu
-
-
摘要:
In order to let machine better imitate thinking method of people to perform recognition and classification for fuzzy and uncertain thing, this paper puts forward a fuzzy and rough association method to deal with the problem. However, the application of fuzzy rough sets (FRS) will be introduced mainly on pattern recognition. Some related theories on FRS would be discussed, and some fuzzy rough mathematical methods on pattern-recognition will be given. Then, concrete applications of FRS on image processing and recognition will be introduced. Simulation result signifies that this fuzzy and rough association method is not only fast but also closer to nature attribute of thing for processing and recognizing image by comparing with the single neural network and other recognition device. The recognition rate is about 95.78%.
-
-
Xinyou Zhang;
Yongchang Huang
-
-
摘要:
This paper reviews the development of f(R) gravity theory and Phantom and Quintessence fields. Specifically, we present a new general action of f(R) gravity and Phantom and Quintessence fields coupled to scalar curvature. Then, we deduce Euler-Lagrange Equations of different fields, matter tensor and effective matter tensor. Additionally, this paper obtains the general pressure, density and speed sound of the new general field action, and investigates different cosmological evolutions with inflation. Further, this paper investigates a general f(R) gravity theory with a general matter action and obtains the different field equations, general matter tensor and effective matter tensor. Besides, this paper obtains the effective Strong Energy Condition (SEC) and effective Null Energy Condition (NEC). Then, we prove that when f(R) approaches to R, the effective SEC and the effective NEC approach to the usual SEC and the usual NEC, respectively. Finally, this paper presents a general action of f(R) gravity, Quintessence and Phantom fields and their applications.