7,887 research outputs found
Current Chinese bryological literature (4)
According to our collections of literature, about 400 scientific papers dealing with Chinese bryophytes have been published in China and abroad during 1990’s. Among these, more than 50 % were published in different scientific journals in China and often written in Chinese with English abstract, which are not well known and assessable for foreign bryologists. Therefore, in addition to previous Chinese literature I-III (Cao et al. 1990, Li et Zhang 1993, 1994), we present the fourth part of Chinese literature herewith. It is hoped that this up-dated list will provide useful information for all people who are interested in bryological research
Whom to Ask? Jury Selection for Decision Making Tasks on Micro-blog Services
It is universal to see people obtain knowledge on micro-blog services by
asking others decision making questions. In this paper, we study the Jury
Selection Problem(JSP) by utilizing crowdsourcing for decision making tasks on
micro-blog services. Specifically, the problem is to enroll a subset of crowd
under a limited budget, whose aggregated wisdom via Majority Voting scheme has
the lowest probability of drawing a wrong answer(Jury Error Rate-JER). Due to
various individual error-rates of the crowd, the calculation of JER is
non-trivial. Firstly, we explicitly state that JER is the probability when the
number of wrong jurors is larger than half of the size of a jury. To avoid the
exponentially increasing calculation of JER, we propose two efficient
algorithms and an effective bounding technique. Furthermore, we study the Jury
Selection Problem on two crowdsourcing models, one is for altruistic
users(AltrM) and the other is for incentive-requiring users(PayM) who require
extra payment when enrolled into a task. For the AltrM model, we prove the
monotonicity of JER on individual error rate and propose an efficient exact
algorithm for JSP. For the PayM model, we prove the NP-hardness of JSP on PayM
and propose an efficient greedy-based heuristic algorithm. Finally, we conduct
a series of experiments to investigate the traits of JSP, and validate the
efficiency and effectiveness of our proposed algorithms on both synthetic and
real micro-blog data.Comment: VLDB201
Effect of Zn doping on magnetic order and superconductivity in LaFeAsO
We report Zn-doping effect in the parent and F-doped LaFeAsO oxy-arsenides.
Slight Zn doping in LaFeZnAsO drastically suppresses the
resistivity anomaly around 150 K associated with the antiferromagnetic (AFM)
spin density wave (SDW) in the parent compound. The measurements of magnetic
susceptibility and thermopower confirm further the effect of Zn doping on AFM
order. Meanwhile Zn doping does not affect or even enhances the of
LaFeZnAsOF, in contrast to the effect of Zn
doping in high- cuprates. We found that the solubility of Zn content ()
is limited to less than 0.1 in both systems and further Zn doping (i.e.,
0.1) causes phase separation. Our study clearly indicates that the
non-magnetic impurity of Zn ions doped in the FeAs layers
affects selectively the AFM order, and superconductivity remains robust against
the Zn doping in the F-doped superconductors.Comment: 7 figures, 13 pages; revised version with more dat
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