http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : ( Haohao Zhao ) (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
-
Qi, Zhikai,Shi, Haohao,Zhao, Mingxing,Jin, Hongchang,Jin, Song,Kong, Xianghua,Ruoff, Rodney S.,Qin, Shengyong,Xue, Jiamin,Ji, Hengxing American Chemical Society 2018 Chemistry of materials Vol.30 No.21
<P>Bernal-stacked bilayer graphene is uniquely suited for application in electronic and photonic devices because of its tunable band structure. Even though chemical vapor deposition (CVD) is considered to be the method of choice to grow bilayer graphene, the direct synthesis of high-quality, large-area Bernal-stacked bilayer graphene on Cu foils is complicated by overcoming the self-limiting nature of graphene growth on Cu. Here, we report a facile H<SUB>2</SUB>O-assisted CVD process to grow bilayer graphene on Cu foils, where graphene growth is controlled by injecting intermittent pulses of H<SUB>2</SUB>O vapor using a pulse valve. By optimizing CVD process parameters fully covered large area graphene with bilayer coverage of 77 ± 3.6% and high AB stacking ratio of 93 ± 3% can be directly obtained on Cu foils, which presents a hole concentration and mobility of 4.5 × 10<SUP>12</SUP> cm<SUP>-2</SUP> and 1100 cm<SUP>2</SUP> V<SUP>-1</SUP> s<SUP>-1</SUP>, respectively, at room temperature. The H<SUB>2</SUB>O selectively etches graphene edges without damaging graphene facets, which slows down the growth of the top layer and improves the nucleation and growth of a second graphene layer. Results from our work are important both for the industrial applications of bilayer graphene and to elucidate the growth mechanism of CVD-graphene.</P> [FIG OMISSION]</BR>
-
A Network Load Sensitive Block Placement Strategy of HDFS
( Lingjun Meng ),( Wentao Zhao ),( Haohao Zhao ),( Yang Ding ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.9
This paper investigates and analyzes the default block placement strategy of HDFS. HDFS is a typical representative distributed file system to stream vast amount of data effectively at high bandwidth to user applications. However, the default HDFS block placement policy assumes that all nodes in the cluster are homogeneous, and places blocks with a simple RoundRobin strategy without considering any nodes` resource characteristics, which decreases self-adaptability of the system. The primary contribution of this paper is the proposition of a network load sensitive block placement strategy. We have implemented our algorithm and justify it through extensive simulations and comparison with similar existing studies. The results indicate that our work not only performs much better in the data distribution but also improves write performance more significantly than the others.
-
Xiuli Han,Yuyuan He,Haohao Zhao,Duo Wang 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.10
Activated carbon could be prepared from residue of rice husk using physical activation with steam as ac-tivating agent. Response surface methodology (RSM) was applied to optimize the effects of processing parameters,and regression analysis was performed on the data obtained. The optimal conditions for adsorption capacity of activatedcarbon from the residue of rice husk were activation temperature of 946 oC, activation time of 31 min and water (18 g)which changed to steam by heating, resulting in 970.06 mg·g−1of iodine adsorption capacity and 31.36% of activatedcarbon yield. The activated carbon prepared under optimum condition was mesoporous with BET surface area of 1,004.296m2·g−1, total pore volume of 0.9388 cm3·g−1and average pore diameter of 2.043 nm. The surface chemical functionalgroups of activated carbon were identified by FT-IR, and its microstructure was examined by scanning electron micro-scopy (SEM). We concluded that the process of physical activation with steam could be an environmentally harmoniousand effective method for preparing activated carbon from residue of desilicated rice husk.
KISS연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
