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 : Sather,N F (검색결과 3 건)
- 무료
- 기관 내 무료
- 유료
-
이기준,Sather,N F 한국화학공학회 1971 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.9 No.4
This paper presents a statistical mechanical description of the random motion of particles in suspension and some results derived there-from for the viscosity of concentrated suspensions of solid spherical particles. In statistical mechanics the information about the probability of dynamical states of the particles of a fluid (i. e., their positions, translational velocities and rotational velocities) is embedded in a particle distribution function, and all of the macroscopic properties of the fluid are specified as integral moments of the distribution function. In particular, the local stress in a suspension is defined as the integral over all particle states of the distribution weighted with the stress at a point for a given instantaneous total particle state. Thus, the calculation of the rheological properties of the suspension comes down to a determination of the distribution function and this local stress function. If the overall shear rate in the suspension is steady and not too large and the particles are neutrally buoyant solid spheres, the net forces and torques on the particles are zero and the local fluid motion is governed by the Stokes equations. It is shown that under these conditions 1) the particle distribution function is independent of the linear and angular velocities of the particles and so is uniquely determined by the particle positions, 2) the viscosity of the suspension must be independent of the shear rate for all concentrations, and 3) the viscosity can be written in a power series in the concentration of particles in which the term of the nth power is the incremental contribution to the viscosity from interactions involving particles. In order to calculate the coefficients of these terms the fluid velocity near the surface of a sphere moving with its neighbors in a, shear field is required. Since an exact determination of the flow field is impractical to obtain for groups of more than two particles, an approximate solution of the Stokes equations obtained by the method of weighted residuals is used in the calculations of the suspension viscosity reported here. The particle configuration is assumed to be simple cubic, and the distribution of interparticle distances is obtained from an approximate statistical model. The viscosity-concentration relationship calculated under these assumptions is found to agree closely with the compilations of experimental data reported by Rutgers and Thomas.
-
Jerry K. Hoepner,Carissa K. Baier,Thomas W. Sather,Mary Beth Clark 한국언어재활사협회 2017 Clinical Archives of Communication Disorders Vol.2 No.1
Purpose: The present pilot investigation sought to examine the potential of Snapchat to be used as a social exchange tool and to identify the types of information individuals with aphasia would share through this picture-based, multi-modality application. Methods: Thirteen individuals with aphasia were involved in a two-day trial of Snapchat at an aphasia camp given a group training and ongoing access to volunteer support. Quantitative measures included frequency counts and use of text and/or drawing functions. Qualitative outcomes used open and axial coding methods to characterize communication intent. These were triangulated through multiple coders, multiple rounds of consensus coding, and three coding schemes. Results: Participants successfully used the Snapchat application to generate 174 total posts, all of which used images and some included text, drawing, or multiple modalities. Three coding schemes emerged, which characterized the intent of post exchanges. Conclusions: Snapchat appears to be a feasible tool to foster social exchange among individuals with aphasia, when given guided, incremental learning, and troubleshooting supports. Individuals with aphasia, given no constraints on what to post, demonstrated their communication intent through the images of people and interactions they exchanged. Availability of scaffolded, incremental supports and ongoing troubleshooting for exploring this picture-based, social networking application appears to be important to successful use. Individuals with aphasia can share what matters to them through images, augmented with text, drawings, or other multi-modal inputs.
-
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
