1,559 research outputs found
Recommended from our members
Point-of-Sale Marketing in Recreational Marijuana Dispensaries Around California Schools.
PurposeAfter marijuana commercialization, the presence of recreational marijuana dispensaries (RMDs) was rapidly increasing. The point-of-sale marketing poses concerns about children's exposure. This study examined advertising and promotions that potentially appeal to children and access restrictions in RMDs around California schools.MethodsThis was a cross-sectional and observational study conducted from June to September 2018. Trained fieldworkers audited retail environments in 163 RMDs in closest proximity to 333 randomly sampled public schools in California.ResultsAbout 44% of schools had RMDs located within 3 miles. Regarding interior marketing, 74% of RMDs had at least one instance of child-appealing products, packages, paraphernalia, or advertisements. RMDs closer to a school had a higher proportion with interior child-appealing marketing. More than three fourths of RMDs had generic promotional activities; particularly, 28% violated the free-sample ban. Regarding exterior marketing, only 2% of RMDs had those appealing to children. More than 60% of RMDs had exterior signs indicative of marijuana. Approximately, one-third had generic advertisements, and 13% had advertisements bigger than 1,600 square inches. Regarding access restrictions, almost all RMDs complied with age verification, but 84% had no age limit signs, and only 40% had security personnel.ConclusionsDespite minimal point-of-sale marketing practices appealing to children on the exterior of RMDs around California schools, such practices were abundant on the interior. Marketing practices not specifically appealing to children were also common on both the interior and exterior of RMDs. Dispensaries' violation of age verification law, lack of security personnel, and presence of child-appealing marketing should be continuously monitored and prevented
The Performance of Canadian Pooled Equity Funds
In this paper, we evaluate and rank the performance of 65 Canadian Equity Pooled Funds. We adopt traditional performance measures to evaluate pooled fund managers’ performances from January 1999 to December 2008. We employ the geometric mean as a reward measure, standard deviation and beta coefficient as risk measures, and Capital Asset Pricing Model (CAPM) risk-adjusted measures that include Jensen’s (1968) alpha, the Treynor (1965) ratio, the Sharpe (1966) ratio, and Modigliani and Modigliani’s (1997) M-Squared. Treynor-Mazuy (1966) and Henriksson-Merton (1981) are used to measure market-timing. According to our results, thirty-five percent of 65 Canadian Equity Pooled Funds managers have abnormal returns in terms of Jensen’s (1968) alpha. Only eight pooled fund managers have market-timing ability. None of 65 pooled fund managers has both selectivity and market-timing ability at the same time
儒学经典中的数学知识初探————以贾公彦对《周礼. 考工记 》㮚氏为量的注疏为例
International audienceBy analysing an excerpt of Jia Gongyan’s commentary on the Rites of Zhou, this paper uncovers different mathematical knowledge as compared with that previous known from Chinese mathematical sources, for example the Nine Chapters on Mathematical Procedures. The differences cover several aspects: structure of procedure, cognition of numbers and figures, mode of reasoning, and the use of counting rods. On the other hand, similar mathematical knowledge to that of Jia Gongyan exists in other Confucian canons. Moreover, a scholar, Wang Zhenru, commented on Confucian canons with Jia Gongyan, and later commented on mathematical books with Li Chunfeng. This paper emphasizes the necessity for further study of the mathematical knowledge in Confucian canons, and the relationship between Confucianism and mathematics
A Methodology to Pre-Screen Commercial Buildings for Potential Energy Savings Using Limited Information
Typical energy audits are sufficiently expensive and time-consuming that many
owners and managers of buildings are not willing to invest the time and money required
for a full audit. This dissertation provides a methodology to identify buildings with large
potential energy savings using limited information, specifically, utility bills, total area
and weather data. The methodology is developed based on the hypothesis: if a
commercial building is properly designed, constructed, operated, and maintained, the
measured energy consumption should approximately match the simulated value for a
typical building of the same size with the most efficient HVAC system; otherwise, there
may be potential for energy savings. There are four steps in the methodology: 1) testing
to determine whether the utility bills include both weather-dependent and weatherindependent
loads; 2) separating weather-dependent and weather-independent loads
when both are present in the same data; 3) determining the main type of HVAC system;
4) estimating potential energy savings and recommending an energy audit if appropriate.
The Flatness Index is selected to test whether the utility bills include both weatherdependent
and weather-independent loads. An approach to separate the utility bills based
on thermal balance is developed to separate utility bills into weather-dependent and
weather-independent loads for facilities in hot and humid climates. The average relative
error in estimated cooling consumption is only 1.1% for 40 buildings in Texas, whereas it is -54.8% using the traditional 3P method. An application of fuzzy logic is used to
identify the main type of HVAC system in buildings from their 12-month weatherdependent
energy consumption. When 40 buildings were tested, 18 systems were
identified correctly, seven were incorrect and the HVAC system type cannot be identified
in 15 cases. The estimated potential savings by the screening methodology in eight large
commercial buildings were compared with audit estimated savings for the same
buildings. The audit estimated savings are between 25% - 150% of the potential energy
savings estimated by the screening procedure in seven cases. The other two cases are less
accurate, indicating that further refinement of the method would be valuable. The data
required are easily obtained; the procedure can be carried out automatically, so no
experience is required. If the actual type of HVAC system, measured weather-dependent,
and weather-independent energy consumption are known, the methodology should work
better
Development of high resolution arrayed waveguide grating spectrometers for astronomical applications: first results
Astrophotonics is the next-generation approach that provides the means to
miniaturize near-infrared (NIR) spectrometers for upcoming large telescopes and
make them more robust and inexpensive. The target requirements for our
spectrograph are: a resolving power of about 3000, wide spectral range (J and H
bands), free spectral range of about 30 nm, high on-chip throughput of about
80% (-1dB) and low crosstalk (high contrast ratio) between adjacent on-chip
wavelength channels of less than 1% (-20dB). A promising photonic technology to
achieve these requirements is Arrayed Waveguide Gratings (AWGs). We have
developed our first generation of AWG devices using a silica-on-silicon
substrate with a very thin layer of silicon-nitride in the core of our
waveguides. The waveguide bending losses are minimized by optimizing the
geometry of the waveguides. Our first generation of AWG devices are designed
for H band and have a resolving power of around 1500 and free spectral range of
about 10 nm around a central wavelength of 1600 nm. The devices have a
footprint of only 12 mm x 6 mm. They are broadband (1450-1650 nm), have a peak
on-chip throughput of about 80% (-1 dB) and contrast ratio of about 1.5% (-18
dB). These results confirm the robustness of our design, fabrication and
simulation methods. Currently, the devices are designed for Transverse Electric
(TE) polarization and all the results are for TE mode. We are developing
separate J- and H-band AWGs with higher resolving power, higher throughput and
lower crosstalk over a wider free spectral range to make them better suited for
astronomical applications.Comment: 12 pages, 13 figures, 3 tables. SPIE Astronomical Telescopes and
Instrumentation, Edinburgh (26 June - 1 July, 2016
Improving immunogenicity and safety of flagellin as vaccine carrier by high-density display on virus-like particle surface
Flagellin is a protein-based adjuvant that activates toll-like receptor (TLR) 5. Flagellin has been actively explored as vaccine adjuvants and carriers. Preclinical and clinical studies find flagellin-based vaccines have a risk to induce systemic adverse reactions potentially due to its overt activation of TLR5. To improve safety and immunogenicity of flagellin as vaccine carriers, FljB was displayed at high densities on hepatitis b core (HBc) virus-like particle (VLP) surface upon c/e1 loop insertion. FljB-HBc (FH) VLPs showed significantly reduced ability to activate TLR5 or induce systemic interleukin-6 release as compared to FljB. FH VLPs also failed to significantly increase rectal temperature of mice, while FljB could significantly increase rectal temperature of mice. These data indicated systemic safety of FljB could be significantly improved by high-density display on HBc VLP surface. Besides improved safety, FH VLPs and FljB similarly boosted co-administered ovalbumin immunization and FH VLPs were found to induce two-fold higher anti-FljB antibody titer than FljB. These data indicated preserved adjuvant potency and improved immunogenicity after high-density display of FljB on HBc VLP surface. Consistent with the high immunogenicity, FH VLPs were found to be more efficiently taken up by bone marrow-derived dendritic cells and stimulate more potent dendritic cell maturation than FljB. Lastly, FH VLPs were found to be a more immunogenic carrier than FljB, HBc VLPs, or the widely used keyhole limpet hemocyanin for nicotine vaccine development with a good local and systemic safety. Our data support FH VLPs to be a potentially safer and more immunogenic carrier than FljB for vaccine development
Dielectric Property of MoS2 Crystal in Terahertz and Visible Region
Two-dimensional materials such as MoS2 have attracted much attention in
recent years due to their fascinating optoelectronic properties. Dielectric
property of MoS2 is desired for the optoelectronic application. In this paper,
terahertz (THz) time-domain spectroscopy and ellipsometry technology are
employed to investigate the dielectric response of MoS2 crystal in THz and
visible region. The real and imaginary parts of the complex dielectric constant
of MoS2 crystal are found to follow a Drude model in THz region, which is due
to the intrinsic carrier absorption. In visible region, the general trend of
the complex dielectric constant is found to be described with a Lorentz model,
while two remarkable peaks are observed at 1.85 and 2.03 eV, which have been
attributed to the splitting arising from the combined effect of interlayer
coupling and spin-orbit coupling. This work affords the fundamental dielectric
data for the future optoelectronic applications with MoS2.Comment: 6 page
- …