Accretion onto a Kiselev black hole

We consider accretion onto a Kiselev black hole. We obtain the fundamental equations for accretion without the back-reaction. We determine the general analytic expressions for the critical points and the mass accretion rate and find the physical conditions the critical points should fulfill. The case of polytropic gas are discussed in detail. It turns out that the quintessence parameter plays an important role in the accretion process.Comment: 7 page

Cloud-based Land Change Modeler Application: Summer Internship with Clark Labs

ABSTRACT Cloud-based Land Change Modeler Application: Summer Internship with Clark Labs, Worcester, MA Lei Rong This report provides a detailed illustration of my internship experience with Clark Labs in Worcester, MA, during the summer of 2015. The internship is about two Land Change Modeler projects which conducted by Esri. The first one is a cloud-based Land Change Model on ArcGIS online for professional change analysts. Another one is a free cloud-based App for land change analysts and the public to explore land change of 48 states in United State. This work mainly relied on TerrSet skills and Land Change Modeler skills. As an GIS analyst, my responsibilities were data extraction, preparation, and modeling test. In June 6th, I started my internship at Clark Labs, and am continuing work till now. I think I gained a lot GIS and non-GIS experience during this time period. In an academic perspective, I got a full understanding of Land Change Modeler and TerrSet during this time period. Socially, I made a connection with students and staffs in Clark Labs. Overall, it is a great experience to me! Yelena Ogneva-Himmelberger ,Ph.D. Chief Instructo

EXIT-charts-aided hybrid multiuser detector for multicarrier interleave-division multiple access

A generically applicable hybrid multiuser detector (MUD) concept is proposed by appropriately activating different MUDs in consecutive turbo iterations based on the mutual information (MI) gain. It is demonstrated that the proposed hybrid MUD is capable of approaching the optimal Bayesian MUD's performance despite its reduced complexity, which is at a modestly increased complexity in comparison with that of the suboptimum soft interference cancellation (SoIC) MU

A Student-Centered Guest Lecturing: A Constructivism Approach to Promote Student Engagement

Student engagement has become a big challenge in higher education, especially when distance learning is getting more and more popular. Guest lecturing is a popular method to bring relevance to the classroom and engage in students. Ground on the theory of constructivism, this paper introduces a student-centered guest lecturing that allows students to work in team and participate in each step of process, such as preparation, interviewing, and reflection. Our pilot study showed that the proposed approach can effectively engage in students. The research methodology and plan are presented and the implications of the study are discussed

Pronunciation Modeling of Foreign Words for Mandarin ASR by Considering the Effect of Language Transfer

One of the challenges in automatic speech recognition is foreign words recognition. It is observed that a speaker's pronunciation of a foreign word is influenced by his native language knowledge, and such phenomenon is known as the effect of language transfer. This paper focuses on examining the phonetic effect of language transfer in automatic speech recognition. A set of lexical rules is proposed to convert an English word into Mandarin phonetic representation. In this way, a Mandarin lexicon can be augmented by including English words. Hence, the Mandarin ASR system becomes capable to recognize English words without retraining or re-estimation of the acoustic model parameters. Using the lexicon that derived from the proposed rules, the ASR performance of Mandarin English mixed speech is improved without harming the accuracy of Mandarin only speech. The proposed lexical rules are generalized and they can be directly applied to unseen English words.Comment: Published by INTERSPEECH 201

Impact of Immersion Teaching on English Sociopragmatic Awareness of Chinese Kindergarten Children: A Polite Study

The purpose of this paper is to examine the impacts of an early partial immersion program as compared to a non-immersion program on English sociopragmatic awareness among Chinese kindergarten children six years of age. Of the 128 children who participated in the experiment involving the use of politeness perception tasks, half received three years of English immersion instruction and the other half were non-immersion children. The results indicate that compared with non-immersion teaching, the immersion instruction was found to be more effective in developing children’s English sociopragmatic awareness in terms of tasks that involve request strategies as opposed to reply strategies. The above results suggest that, apart from immersion teaching, speech act is another important variable affecting second language sociopragmatic competence during early childhood