56,501 research outputs found
Measurements of K S 0 - K L 0 asymmetries in the decays Λ c + → p K L , S 0 , p K L , S 0 π + π − and p K L , S 0 π 0
No full textAbstract Using e + e − annihilation data sets corresponding to an integrated luminosity of 4.5 fb −1, collected with the BESIII detector at center-of-mass energies between 4.600 and 4.699 GeV, we report the first measurements of the absolute branching fractions B Λ c + → p K L 0 = (1.67 ± 0.06 ± 0.04)%, B Λ c + → p K L 0 π + π − = (1.69 ± 0.10 ± 0.05)%, and B Λ c + → p K L 0 π 0 = (2.02 ± 0.13 ± 0.05)%, where the first uncertainties are statistical and the second systematic. Combining with the known branching fractions of Λ c + → p K S 0 , Λ c + → p K S 0 π + π − , and Λ c + → p K S 0 π 0 , we present the first measurements of the K S 0 - K L 0 asymmetries R Λ c + K S , L 0 X = B Λ c + → K S 0 X − B Λ c + → K L 0 X B Λ c + → K S 0 X + B Λ c + → K L 0 X in charmed baryon decays: R Λ c + p K S , L 0 = − 0.025 ± 0.031 , R Λ c + p K S , L 0 π + π − = − 0.027 ± 0.048 and R Λ c + p K S , L 0 π 0 = − 0.015 ± 0.046 . No significant asymmetries with statistical significance are observed
Measurement of the differential and double-differential Drell-Yan cross sections in proton-proton collisions at root s=7 TeV
Get PDFMeasurements of the differential and double-differential Drell-Yan cross sections are presented using an integrated luminosity of 4.5 (4.8) fb−1 in the dimuon (dielectron) channel of proton-proton collision data recorded with the CMS detector at the LHC at s√ = 7 TeV. The measured inclusive cross section in the Z-peak region (60–120 GeV) is σ(ℓℓ) = 986.4 ± 0.6 (stat.) ± 5.9 (exp. syst.) ± 21.7 (th. syst.) ± 21.7 (lum.) pb for the combination of the dimuon and dielectron channels. Differential cross sections dσ/dm for the dimuon, dielectron, and combined channels are measured in the mass range 15 to 1500 GeV and corrected to the full phase space. Results are also presented for the measurement of the double-differential cross section d2σ/dm d|y| in the dimuon channel over the mass range 20 to 1500 GeV and absolute dimuon rapidity from 0 to 2.4. These measurements are compared to the predictions of perturbative QCD calculations at next-to-leading and next-to-next-to-leading orders using various sets of parton distribution functions
Samadinia natalensis Yan & Lee & Forges & Ng 2021, new combination
No full textSamadinia natalensis (Kensley, 1977), new combination: Holotype: ovigerous female (16.0 × 10.8 mm) (SAM– A15323), stn SM43, off Natal, South Africa, no other data. Paratype: 1 male (7.6 × 4.7 mm) (SAM– A15324), stn SM23, off Natal, South Africa, 450– 400 m depth, coll. 26 May 1975.Published as part of Yan, Bee, Lee, Forges, Bertrand Richer De & Ng, Peter K. L., 2021, The generic affinities of the Indo-West Pacific species assigned to Rochinia A. Milne-Edwards, 1875 (Crustacea: Brachyura: Majoidea: Epialtidae), pp. 19-44 in Raffles Bulletin of Zoology 69 on page 43, DOI: 10.26107/RBZ-2021-0004, http://zenodo.org/record/535164
Using performance assessment in secondary school mathematics: an empirical study in a Singapore classroom
No full textThis article reports an exploratory study on using performance assessment in mathematics instruction in a high-performing secondary school in Singapore. An intact mathematics class participated in the study, and received chapter-based performance tasks as intervention during regular mathematics lessons for about one and a half school years. The performance tasks used included authentic and/or open-ended tasks. The students’ academic achievements and attitudes in mathematics were compared with a comparison class that did not receive the intervention. Both quantitative and qualitative data were collected, mainly through questionnaire surveys, performance task tests, conventional school exams, and interviews with students and teachers. The results suggest that the students receiving the intervention performed significantly better than their counterparts in solving conventional exam problems, and in general they also showed more positive changes in attitudes towards mathematics and mathematics learning. The students from the experimental class also expressed positive views about the benefits of using performance tasks in promoting their ability in higher order thinking, though no statistically significant difference was detected between the two classes of students in solving unconventional tasks before and after intervention. Overall, the results appear to support teachers’ using contextualised problems in real life situations and open-ended investigations in students’ learning of mathematic
Americans’ perceptions of and likely responses to the threat of avian influenza in the U.S. food supply
No full textHighly pathogenic avian influenza has affected poultry consumption in all affected countries as well as some countries that have not been affected. If, as some predict, there is an outbreak of avian influenza in poultry in the U.S., there will likely be serious repercussions on the entire food system.To predict what might happen if avian influenza emerged in poultry or wild birds in the U.S. researchers at the Food Policy Institute at Rutgers, the State University of New Jersey, conducted a national survey of public knowledge, attitudes, intentions, and behaviors related to the threat of avian influenza in the food supply.MethodologyA total of 1200 telephone interviews, lasting an average of 22 minutes, were completed between May 3, and June 5, 2006.2 The survey sample was selected through a random digit dial list. The sample selection procedures ensure that every household within the United States has an equal chance to be included in the survey. Each selected number was called a maximum of 15 times with calls distributed across days and times to try to reach a member of the household. The data was weighted using appropriate U.S. census weights for gender, age, race, ethnicity, and education. The cooperation rate was 60%. This paper summarizes the findings of the survey.Rutgers Food Policy Institute (FPI) Research Report RR-1106-01
Public Perceptions of Genetically Modified Foods: A National Study of American Knowledge and Opinion
No full textThis report presents the results from the second phase of a longitudinal study of Americans’ knowledge and feelings about agricultural biotechnology and how those perceptions and attitudes have changed over time. Two independent national probability samples of 1,200 adults were interviewed by phone in the spring of 2001 and 2003. While this report focuses on the findings from 2003, longitudinal comparisons are presented where appropriate. The report begins with an investigation of Americans’ awareness of the presence of genetically modified (GM) ingredients in the foods they encounter everyday. Next, the report describes Americans’ actual and perceived knowledge of science, biotechnology and food production. It then examines American opinions about GM foods in general, along with their opinions on a variety of existing and potential GM food products with direct or indirect consumer benefits. The report discusses the relationship between opinions of GM food and a variety of factors, including demographics, knowledge of biotechnology, purchasing behaviors and styles of food selection. Finally, it describes Americans’ thoughts on GM food labeling.Suggested Citation:
Hallman, W. K., Hebden, W. C., Aquino, H.L., Cuite, C.L. and Lang, J.T. 2003. Public Perceptions of Genetically Modified Foods: A National Study of American Knowledge and Opinion. (Publication number RR-1003-004). New Brunswick, New Jersey; Food Policy Institute, Cook College, Rutgers - The State University of New Jersey
Avian Influenza in Poultry: American Knowledge, Perceptions, and Responses
No full textComputer assisted telephone interviews (CATI) were conducted with a nationally representative sample of 1,200 non-institutionalized American adults (aged 18 and over) between May 3, 2006 and June 5, 2006. The results indicated:
• Avian influenza is on the national agenda
- Most Americans (93%) indicate they have heard of avian influenza.
- Nearly three-quarters of Americans say they have discussed avian influenza with someone else.
• Still, most Americans don’t know much about avian influenza
- More than half of Americans say they know ‘little’ or ‘nothing’ about avian influenza.
- On average, Americans correctly answer fewer than 60% of a series of 22 objective knowledge
questions.
• Uncertainty regarding food-related transmission
- The majority of Americans are aware that animal to human transmission of the avian influenza virus
can occur from contact with live infected birds or feces from infected birds.
- About one-third are unsure if transmission is possible from eating infected meat or eggs.
• Conflicting beliefs about preventing infection
- More than two-thirds of Americans believe the virus is present in uncooked meat of infected
chickens.
- Yet, less than half believe that proper cooking chicken kills the avian influenza virus.
- Few Americans believe infected live birds are easily recognizable; yet, many believe infected raw
meat is readily identifiable.
• Americans perceive the general risks posed by avian influenza to be low
- Americans aren’t very worried about illness with avian influenza.
- Americans report their risk of infection with avian influenza in the next year to be relatively low and
other Americans’ risk of infection to be higher, but still moderate.
• Yet, Americans see avian influenza in chicken as more risky
- The majority of Americans report greater perceived risk specifically associated with the consequences of eating chicken infected with avian influenza.
• Most Americans currently view chicken as safe and continue to eat it
- More than nine-in-ten Americans say they currently eat chicken.
- Americans report that chicken products in the U.S. are currently safe to eat.
• The proximity of avian influenza cases affects Americans likelihood of eating chicken
- The nearer avian influenza comes to the U.S., the less likely Americans are to eat chicken.
- Avian influenza does not necessarily have to emerge in the U.S. to affect poultry consumption.
• Many Americans are unlikely to eat chicken if the avian influenza virus is found inside the
U.S.
- Americans say they are relatively unlikely to eat chicken in the U.S. if avian influenza is found in wild
birds in the U.S. or if someone became sick with avian influenza from eating chicken in the U.S.
- Americans report being least likely to eat chicken in the U.S. if avian influenza was found in chickens
on farms in the U.S. and 39% report that they would definitely not eat chicken.
- Americans report reluctance to eat any chicken products if U.S. chickens are infected.
• Even with a strong, specific assurance of safety, many Americans report that they would be
unlikely to eat chicken again if the avian influenza virus is found inside the U.S.
- One-fifth (20%) say they would never eat chicken again.
- Those participants who said they would eat chicken again, report that it would take an average of 144 days for them to start eating it again (SD=337.67; Mdn=42).Suggested Citation:
Condry, S. C., Hallman, W. K., Vata, M., & Cuite, C. L. (2007). Avian influenza in poultry: Americans’
knowledge, perceptions, and responses. (Publication number RR-0507-014). New Brunswick, New Jersey: Rutgers, the State University of New Jersey, Food Policy Institute
Caridina disparidentata Liang, Yan and Wang 1984
No full text<i>Caridina disparidentata</i> Liang, Yan and Wang, 1984 <p>(®gure 5)</p> <p> <i>Caridina disparidentata</i> Liang, Yan and Wang, 1984: 254, ®gures 1±12 (type locality: Shihuiyao reservoir, Qujing County, Yunnan).</p> <p> <i>Caridina heterodentata</i> Liang, Yan and Wang, in Liang and Yan, 1985: 196.</p> <p> <i>Material examined</i></p> <p>HOLOTYPE:, l bl. 21 mm (SFU: 83-67-01), Shihuiyao reservoir, Qujing County, Yunnan (SFU).</p> <p>PARATYPES: One m, cl. 6.0 mm (SFU: 83-67-02), data same as holotype.</p> <p> <i>Other specimens.</i> Four ll, cl. 4.2±6.2 mm, two mm, cl. 5.0± 7.4 mm, Maoshan village near Kunming city, Yunnan; July 1978; one m, cl. 5.0 mm, river at Jiankang farm, Maguan County, Yunnan (IZAS).</p> <p> <i>Diagnosis</i></p> <p> Rostrum straight, reaching to middle of second segment or end of antennular peduncle. Teeth arrangement extremely variable, armed dorsally with two to 11 teeth, all on carapace, rostrum, or on both carapace and rostrum, ventrally with zero to seven teeth (mode 3±5). Antennular peduncle <i>ca</i> 0.5 times as long as carapace. Carpus of ®rst pereiopod 1.9±2.2 times as long as high, chela 2.1±2.2 times as long as broad. Carpus of second pereiopod 3.7±4.2 times as long as high, chela 2.5±2.7 times as long as broad. Propodus of third pereiopod 3.4±3.8 times as long as dactylus, dactylus with six to seven spinules. Propodus of ®fth pereiopod 3.5±3.9 times as long as dactylus, dactylus with 37±40 spinules. Endopod of male ®rst pleopod subrectangular, <i>ca</i> 3.5 times as long as wide, appendix interna reaching to distal end of endopod. Appendix interna of male second pleopod short, less than 0.25 times as long as appendix masculina. Uropodal diaeresis with 15±18 teeth. Egg size 1.31± 1.40 <i>Ö</i> 0.81±0.98 mm in diameter.</p> <p> <i>Remarks</i></p> <p> <i>Caridina disparidentata</i> diOEers from <i>C. yunnanensi s</i> in the form of the rostrum, which is more variable in the teeth arrangement; the longer dactylus of the third (propodus 3.4±3.8 times as long as dactylus vs 4.0±4.5 times in <i>C. yunnanensi s</i>) and ®fth pereiopods (propodus 3.5±3.9 times as long as dactylus vs 3.8±4.5 times in <i>C. yunnanensi s</i>), the longer endopod of male ®rst pleopod (3.5 times as long as broad vs 2.8±3.0 times) and the short appendix interna (0.25 times as long as appendix masculina vs 0.33 in <i>C. yunnanensi s</i>).</p> <p> There is some confusion over the correct name for this species. The species was ®rst validly described by Liang <i>et al.</i> (1984) as <i>C. disparidentata</i> from Yunnan. These authors had used a diOEerent manuscript name, <i>C. heterodentata</i>, for the species; the label with this name was still kept with the types of <i>C. disparidentata</i> when the ®rst author examined the material in SFU. But when they published their paper (Liang <i>et al.</i>, 1984), however, they changed its name to <i>C. disparidentata</i>. In a later paper reviewing the <i>Caridina</i> species from Yunnan, however, Liang and Yan (1985) erroneously used their original but unpublished name, <i>C. heterodentata</i>, for the species, apparently forgetting that they had used the name <i>C. disparidentata</i> in their 1984 publication! <i>Caridina heterodentata</i> Liang and Yan, 1985, must thus be regarded as an unjusti®ed emendation of <i>C. disparidentata</i> Liang, Yan and Wang, 1984. As both names utilize the same type specimens, both names are objective synonyms and <i>Caridina disparidentat a</i> Liang, Yan and Wang, 1984, is the valid name.</p> <p> <i>Habitat</i></p> <p> Found in reservoirs (Liang <i>et al.</i>, 1984), mountain streams and small rivers (Y. Duan, personal communication).</p> <p> <i>Distribution</i> Qujing, Maguan Counties and near Kunming city, Yunnan (®gure 1).</p>Published as part of <i>Ng, Y. Cai and P. K. L. & Ng, Cai P. K. L., 2010, revision of Caridina yunnanensis and its allied species (Crustacea: Decapoda: Caridea: Atyidae) from Yunnan, southern China, with description of one new species, pp. 213-227 in Journal of Natural History 35</i> on pages 218-219, DOI: 10.1080/00222930150215341, <a href="http://zenodo.org/record/10083275">http://zenodo.org/record/10083275</a>
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