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 : Cheng, Hu (검색결과 7,093 건)
- 무료
- 기관 내 무료
- 유료
-
Effects of Neodymium and Calcium on the Thermal Stability of AZ71 Magnesium Alloys
Cheng‑Feng Yue,Shi‑Jei Huang,Jhewn‑Kuang Chen,Hsien‑Tsung Li,Kam‑Shau Chan 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.2
The effects of an addition of 0–2 wt% Nd on thermal stability of 0–3 wt% Ca-containing modified AZ71 magnesium alloyswas investigated. The ignition temperature was found to increase from that of AZ71, 574, to 825 °C with the addition of0.5 wt% Ca and 1 wt% Nd. The ignition temperature was further increased to 1114 °C when 3 wt% Ca was added. The CaandNd-added AZ71 was isothermally maintained at a temperature of 500 °C in air for 12 h. The MgO–CaO–Nd2O3 formedon the surface to improve the thermal stability of the AZ71–xCa–yNd alloys. While both the tensile strength and ductilitydecreased with the Ca concentration in the alloy, an addition of 1 wt% Nd was found able to alleviate the degradation effectsof Ca on the tensile strength and ductility at 170 °C. Both solid solution formation and precipitation strengthening contributedto the increase in toughness. AZ71 containing 0.5–2 wt% Ca and 1 wt% Nd provides the optimum combination of ignitionresistance and mechanical properties.
-
Effects of Mold Growth on Building Materials by Different Environments in Taiwan
An Cheng,Yu Hsin,Wei-Ting Lin 대한토목학회 2014 KSCE Journal of Civil Engineering Vol.18 No.4
The main of study is to investigate the effect of moisture variation and micro-structure on the growth mold at surface of buildingmaterials. The two different water-cement ratio of mortars (w/c = 0.4, 0.6), brick and tiles were used in this study. The mercuryIntrusion Porosity-Meter (MIP) was used to determine the pore distribution of building materials. The moisture variation of materialswas recorded in constant climate chamber (25oC, relative humidity 80%), general indoor environment (28oC, relative humidity 55%)and water damage simulation environment. The results indicated that the pore size and distribution will affect the surface water ratioand moisture content of materials. The surface water ratio of specimen was affected by different environment seriously. The surfacewater ratio was an important factor in mold growth.
-
-
-
Cheng,Soo May,Yang,Li,Dong,Lin 세계문화관광학회 2007 Conference Proceedings Vol.8 No.0
While western scholars such as Jamal and Gertz (1995), Tosun (2005), Fallon and Kriwoken (2003), usually presume that community participation is critical to sustainable tourism development, Chinese scholar Wenjun Li (2006) boldly states that it is possible for a community to achieve benefits of tourism development despite weak involvement in the planning and management of a tourist destination. Our survey of government officials, tourist business operators and residents in seven locations in the World Heritage-listed Turpan Valley in the Xinjiang province found that top-down, government-led participation is necessary and desirable, and does not detract from stakeholders' perception that they are sharing in the benefits of tourism development in the region.
-
Women in Public Spaces : Theater, Modernity, and Actresses in Early Twentieth-Century Beijing
Weikun CHENG Ewha Womans University Press 2003 Asian Journal of Women's Studies(AJWS) Vol.9 No.3
In the male-dominated theatrical world of early twentieth century China, actresses strategically relied on personal connections to survive. As "public" women and agents of mass media, they were utilized by men for different purposes. Theatrical managers and male audiences were intent on turning actresses into sexual objects in licentious plays, whereas nationalist reformers recruited actresses for mass mobilization. Actresses participated in the nation-building cause by presenting diverse human roles via the stories that either conveyed new idecologies or historical values. The fictional plots of women's emancipation, however, provided a learning process in which actresses could adopt the concepts of personal rights, self-determined marriage, and economic autonomy. The Chinese states, despite minor variations, always sustained ideals of gender distinctions and opposed or restrained women's public roles. The stories of actresses' survival and prosperity, nonetheless, demonstrated the tremendous endurance, flexibility, intelligence, and strength of Chinese women.
-
Full-space Cloud of Random Points with a Scrambling Metasurface
Li, Zile,Dai, Qi,Mehmood, Muhammad Q.,Hu, Guangwei,yanchuk, Boris Luk’,Tao, Jin,Hao, Chenglong,Kim, Inki,Jeong, Heonyeong,Zheng, Guoxing,Yu, Shaohua,Alù,, Andrea,Rho, Junsuk,Qiu, Cheng-Wei Nature Publishing Group UK 2018 Light, science & applications Vol.7 No.1
<▼1><P>With the rapid progress in computer science, including artificial intelligence, big data and cloud computing, full-space spot generation can be pivotal to many practical applications, such as facial recognition, motion detection, augmented reality, etc. These opportunities may be achieved by using diffractive optical elements (DOEs) or light detection and ranging (LIDAR). However, DOEs suffer from intrinsic limitations, such as demanding depth-controlled fabrication techniques, large thicknesses (more than the wavelength), Lambertian operation only in half space, etc. LIDAR nevertheless relies on complex and bulky scanning systems, which hinders the miniaturization of the spot generator. Here, inspired by a Lambertian scatterer, we report a Hermitian-conjugate metasurface scrambling the incident light to a cloud of random points in full space with compressed information density, functioning in both transmission and reflection spaces. Over 4044 random spots are experimentally observed in the entire space, covering angles at nearly 90°. Our scrambling metasurface is made of amorphous silicon with a uniform subwavelength height, a nearly continuous phase coverage, a lightweight, flexible design, and low-heat dissipation. Thus, it may be mass produced by and integrated into existing semiconductor foundry designs. Our work opens important directions for emerging 3D recognition sensors, such as motion sensing, facial recognition, and other applications.</P></▼1><▼2><P><B>Metasurfaces: scrambling light for 3D detection and recognition</B></P><P>Firing light at a manufactured 'metasurface'—one carrying patterns at a smaller scale than the wavelength of the light—fills large volumes of space with defined points of light, potentially improving 3-D recognition and sensor applications. Cheng-Wei Qui and colleagues at the National University of Singapore, with co-workers across Asia and in the USA, created their unique metasurface from amorphous silicon. Light is scattered from and transmitted through the material to generate a cloud of data points in the surrounding space in which the structure and motion of objects under study can be analyzed. The initial development work with this “scrambling metasurface” suggests it could improve pattern recognition, including face recognition, motion detection and augmented reality applications. The researchers describe how their innovation overcomes significant limitations of existing methods in these fields.</P></▼2>
-
-
Incompatible 3-node interpolation for gradient-dependent plasticity
Chen, G.,Baker, G. Techno-Press 2004 Structural Engineering and Mechanics, An Int'l Jou Vol.17 No.1
In gradient-dependent plasticity theory, the yield strength depends on the Laplacian of an equivalent plastic strain measure (hardening parameter), and the consistency condition results in a differential equation with respect to the plastic multiplier. The plastic multiplier is then discretized in addition to the usual discretization of the displacements, and the consistency condition is solved simultaneously with the equilibrium equations. The disadvantage is that the plastic multiplier requires a Hermitian interpolation that has four degrees of freedom at each node. Instead of using a Hermitian interpolation, in this article, a 3-node incompatible (trigonometric) interpolation is proposed for the plastic multiplier. This incompatible interpolation uses only the function values of each node, but it is continuous across element boundaries and its second-order derivatives exist within the elements. It greatly reduces the degrees of freedom for a problem, and is shown through a numerical example on localization to yield good results.
-
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
