检索范围:
排序: 展示方式:
Performance analysis of combined cycle power plant
Nikhil DEV,Rajesh ATTRI
《能源前沿(英文)》 2015年 第9卷 第4期 页码 371-386 doi: 10.1007/s11708-015-0371-9
付昱华
《中国工程科学》 2003年 第5卷 第6期 页码 55-58
牛顿第二定律及万有引力定律是根据实验结果总结出来的。为了探讨从理论上导出这两个定律的可能性,根据能量守恒定律,给出用变维分形方法针对一个实例(小球沿长斜面滚下)导出改进的牛顿第二定律及万有引力定律的方法。具体给出了适用于实例的常维分形结果:改进的万有引力定律F=-GMm / r1.99989和改进的牛顿第二定律F=ma1.01458。
Exergy losses in premixed flames of dimethyl ether and hydrogen blends
Tongbin ZHAO, Jiabo ZHANG, Dehao JU, Zhen HUANG, Dong HAN
《能源前沿(英文)》 2019年 第13卷 第4期 页码 658-666 doi: 10.1007/s11708-019-0645-8
关键词: second law analysis flame dimethyl ether (DME) hydrogen binary fuels
《农业科学与工程前沿(英文)》 2021年 第8卷 第2期
Seedless fruits are desirable in the citrus fresh fruit market. Triploid production via diploid × tetraploid interploidy crosses is thought to be the most efficient and widely-used strategy for the breeding of seedless citrus. Although ‘Orah’ mandarin has desirable organoleptic qualities, seeds in the fruits weaken its market competitiveness. To produce new seedless cultivars that are similar to ‘Orah’ mandarin, we performed three 2x × 4x crosses using ‘Orah’ mandarin as the seed parent to regenerate triploid plantlets. A total of 182 triploid and 36 tetraploid plantlets were obtained. By analyzing their genetic origins using nine novel single nucleotide polymorphism (SNP) markers, all of the triploids and tetraploids derived from these three crosses were proven to be hybrids. Also, we demonstrated that 2n megagametophyte formation in ‘Orah’ mandarin result in tetraploid production in these three interploidy crosses. These tetraploid plantlets were genotyped using eight pericentromeric SNP markers and nine centromere distal SNP markers. Based on the genotypes of the 2n megagametophytes, the parental heterozygosity rates in 16 SNP loci and all 2n megagametophytes were less than 50%, indicating that second division restitution was the mechanism underlying 2n megagametophyte formation at both the population and individual levels. These triploid hybrids enrich the germplasm available for seedless breeding. Moreover, the tetraploid hybrids are valuable as parents for ploidy breeding for the production of seedless citrus fruits.
High-order phase-field model with the local and second-order max-entropy approximants
Fatemeh AMIRI
《结构与土木工程前沿(英文)》 2019年 第13卷 第2期 页码 406-416 doi: 10.1007/s11709-018-0475-5
关键词: second-order maximum entropy local maximum entropy second- and fourth-order phase-field models B-spline
《网络安全法(草案二次审议稿)》第27条修改建议——以网络服务提供者协助解密义务为中心
崔聪聪,李欲晓,韩松
《中国工程科学》 2016年 第18卷 第6期 页码 34-38 doi: 10.15302/J-SSCAE-2016.06.007
网络服务提供者协助解密义务,隐含着公权力(侦查权)与私权利(通信秘密权、隐私权)之间的冲突。用户的非公开信息应该在可控、可追溯基础上,遵循必要性原则和比例原则,综合考虑执法成本,司法机关经由法律确定网络服务提供者履行协助解密义务获取,进而达到社会治理管控、公众安宁生活与网络服务提供者营业自由的综合效益最大化目标,避免落入公权力严重侵犯私权利的情形或者出现政府失效的无序状态。
Zhijun LI, Zichen DENG
《结构与土木工程前沿(英文)》 2009年 第3卷 第2期 页码 111-116 doi: 10.1007/s11709-009-0022-5
关键词: discrete-time variable structure control composite reaching law chattering effect saturated control law
高效节能计算的跨层设计:为实现每瓦特电力每秒千万亿次运算 Perspectives
Xiaobo Sharon HU, Michael NIEMIER
《信息与电子工程前沿(英文)》 2018年 第19卷 第10期 页码 1209-1223 doi: 10.1631/FITEE.1800466
How did Archimedes discover the law of buoyancy by experiment?
Hidetaka KUROKI
《机械工程前沿(英文)》 2016年 第11卷 第1期 页码 26-32 doi: 10.1007/s11465-016-0368-z
After Archimedes and Vitruvius era, for more than 2000 years, it has been believed that the displaced water measurement of golden crown is impossible, and at his Eureka moment, Archimedes discovered the law of buoyancy (Proposition 7 of his principles) and proved the theft of a goldsmith by weighing the golden crown in water.
A previous study showed that a small amount of displaced water was able to be measured with enough accuracy by the introduced method. Archimedes measured the weight of displaced water. He did not find the law of buoyancy but rather specific gravity of things at the moment.
After which, Archimedes continued to measure the specific gravity of various solids and fluids. Through these measurements, he reached the discovery of the law of buoyancy directly by experiment. In this paper, the process to the discovery of Archimedes’ principle (Proposition 5) is presented.
关键词: Archimedes’ principle buoyancy specific gravity Eureka Vitruvius displaced water balance floating body
Fu Sun,Yi Liu
《环境科学与工程前沿(英文)》 2016年 第10卷 第6期 doi: 10.1007/s11783-016-0890-6
DONG Hongwei
《环境科学与工程前沿(英文)》 2007年 第1卷 第4期 页码 434-442 doi: 10.1007/s11783-007-0069-2
关键词: law-abiding punishment environmental protection law-breaking enterprise
Numerical simulation of sudden-expansion two-phase flows with two-scale second-order moment particle
ZENG Zhuoxiong, HAN Shoulei, ZHOU Lixing
《能源前沿(英文)》 2007年 第1卷 第2期 页码 202-206 doi: 10.1007/s11708-007-0026-6
关键词: gas-particle single-scale second-order large-scale fluctuation second-order sudden-expansion
傅志寰
《中国工程科学》 2008年 第10卷 第12期 页码 13-16
近年来我国能源消费增长快、利用效率低的问题比较突出,原有《节能法》已经不能适应当前节能工作的要求。为了推动全社会的节约能源工作,全国人大今年修订了这部法律。文章介绍了修订后的《节能法》基本思路、主要内容和实施后的初步效果。
Qiangming XIA, Wei WANG, Kaidong XIE, Xiaomeng WU, Xiuxin DENG, Jude W. GROSSER, Wenwu GUO
《农业科学与工程前沿(英文)》 页码 302-313 doi: 10.15302/J-FASE-2021385
关键词: Citrus 2n gamete interploidy hybridization pericentromeric SNP marker second division restitution
First law-based thermodynamic analysis on Kalina cycle
ZHANG Ying, HE Maogang, JIA Zhen, LIU Xun
《能源前沿(英文)》 2008年 第2卷 第2期 页码 145-151 doi: 10.1007/s11708-008-0021-6
关键词: ammonia-water P-R single-stage distillation Peng-Robinson pressure
标题 作者 时间 类型 操作
Exergy losses in premixed flames of dimethyl ether and hydrogen blends
Tongbin ZHAO, Jiabo ZHANG, Dehao JU, Zhen HUANG, Dong HAN
期刊论文
UNREDUCED MEGAGAMETOPHYTE FORMATION VIA SECOND DIVISION RESTITUTION CONTRIBUTES TO TETRAPLOID PRODUCTION
期刊论文
High-order phase-field model with the local and second-order max-entropy approximants
Fatemeh AMIRI
期刊论文
Improving existing “reaching law” for better discrete control of seismically-excited building structures
Zhijun LI, Zichen DENG
期刊论文
China’s Ministry of Environmental Protection Adopted Draft Amendment to the Law on Prevention and Control
Fu Sun,Yi Liu
期刊论文
Why does environmental compliance cost more than penalty? —A legal analysis on environmental acts of enterprises in China
DONG Hongwei
期刊论文
Numerical simulation of sudden-expansion two-phase flows with two-scale second-order moment particle
ZENG Zhuoxiong, HAN Shoulei, ZHOU Lixing
期刊论文
UNREDUCED MEGAGAMETOPHYTE FORMATION VIA SECOND DIVISION RESTITUTION CONTRIBUTES TO TETRAPLOID PRODUCTION
Qiangming XIA, Wei WANG, Kaidong XIE, Xiaomeng WU, Xiuxin DENG, Jude W. GROSSER, Wenwu GUO
期刊论文