Crystal field states of Kondo lattice heavy fermions CeRuSn3 and CeRhSn3

Inelastic neutron scattering experiments have been carried out to determine the crystal field states of the Kondo lattice heavy fermions CeRuSn3 and CeRhSn3. Both the compounds crystallize in LaRuSn3-type cubic structure (space group Pm-3n) in which the Ce atoms occupy two distinct crystallographic sites with cubic (m-3) and tetragonal (-4m.2) point symmetries. The INS data of CeRuSn3 reveal the presence of a broad excitation centered around 6-8 meV which is accounted by a model based on crystal electric field (CEF) excitations. On the other hand, the INS data of isostructural CeRhSn3 reveal three CEF excitations around 7.0, 12.2 and 37.2 meV. The neutron intensity sum rule indicates that the Ce ions at both cubic and tetragonal Ce sites are in Ce3+ state in both CeRuSn3 and CeRhSn3. The CEF level schemes for both the compounds are deduced. We estimate the Kondo temperature T_K = 3.1(2) K for CeRuSn3 from neutron quasielastic linewidth in excellent agreement with that determined from the scaling of magnetoresistance which gives T_K = 3.2(1) K. For CeRhSn3 the neutron quasielastic linewidth gives T_K = 4.6 K. For both CeRuSn3 and CeRhSn3, the ground state of Ce3+ turns out to be a quartet for the cubic site and a doublet for the tetragonal site.Comment: 12 pages, 13 figures, 2 tables, to appear in Phys. Rev.

Tariff and Tariff Rate Quota Liberalization in the South African Livestock Industry: Approaches to Welfare Measurement

The liberalization of the agricultural sector and phasing out of past protection mechanisms in South Africa saw the introduction of a process of tariff reform. Furthermore, a system of tariff rate quotas was introduced in compliance with WTO regulations. This study uses a partial equilibrium comparative static model to measure the welfare effects of further liberalization in the livestock industry of South Africa, particularly in meat products using four policy scenarios. The traditional method of welfare analyses using the CS and PS was applied, while the EV was used to integrate a well-behaved objective function. Although the CS and PS could have over-estimated welfare due to the fact that the demand system used in this study is non-linear, they still gave useful information sufficient to compare the impact of trade liberalization on consumers and producers of livestock products. Furthermore, the EV explains the income change necessary to attain the welfare level resulting from trade liberalization given the current prices. When expressed as a percentage of the real gross national income and real disposable income, the values are quite marginal. The results from both methods of welfare measurement suggest that it is worth considering the effects on producers if further trade liberalization is envisaged in the South African livestock industry.International Relations/Trade, Livestock Production/Industries,

Trade Liberalization in the South African Livestock Industry: implications for rural development

Livestock farming is an important facet of agriculture and livelihood in South Africa. It forms the essence of rural agriculture contributing food, socio-economic stability, employment and income. After the liberalization of the agricultural sector and phasing out of past protection mechanisms South Africa introduced a process of tariff reform. Furthermore, a system of tariff rate quotas was introduced in compliance with WTO regulations. A partial equilibrium comparative static model was used to investigate the impact of further liberalization in the livestock industry of South Africa, particularly in meat products using four policy scenarios. Specific emphasis was given to the liberalization of the current TRQ regime. The implication of the results are that the development efforts by government aimed at commercializing emerging commercial stock farming in order to address equity and poverty may be slowed down considerably with further trade liberalization; especially since substitution with other agricultural enterprises are limited. The conclusion is that the expansion in current quotas might be a more proper policy directive than reducing applied tariffs over the short to medium run to comply with trade liberalization targets as well as WTO commitments. The reason for this is that quota expansion brings about moderate changes in domestic prices of livestock and meat products as compared to tariff reductions.Agricultural and Food Policy, Environmental Economics and Policy, Food Consumption/Nutrition/Food Safety, Food Security and Poverty, Health Economics and Policy, Institutional and Behavioral Economics, International Relations/Trade, Marketing, Productivity Analysis, Research and Development/Tech Change/Emerging Technologies, Research Methods/ Statistical Methods,

Implications of Tariff Rate Quotas Liberalization in the South African Livestock Industry

Livestock farming is an important facet of agriculture and livelihood in South Africa. It forms the essence of rural agriculture contributing food, socio-economic stability, employment and income. After the liberalization of the agricultural sector and phasing out of past protection mechanisms South Africa introduced a process of tariff reform. Furthermore, a system of tariff rate quotas was introduced in compliance with WTO regulations. A partial equilibrium comparative static model was used to investigate the impact of further liberalization in the livestock industry of South Africa, particularly in meat products using four policy scenarios. Specific emphasis was given to the liberalization of the current TRQ regime. The conclusion is that the expansion in current quotas might be a more proper policy directive than reducing applied tariffs over the short to medium run to comply with trade liberalization targets.International Trade, Agricultural Development, Partial Equilibrium Model, Applied Welfare Economics, International Relations/Trade, Livestock Production/Industries,

Physical properties of noncentrosymmetric superconductor LaIrSi3: A {\mu}SR study

The results of heat capacity C_p(T, H) and electrical resistivity \rho(T,H) measurements down to 0.35 K as well as muon spin relaxation and rotation (\muSR) measurements on a noncentrosymmetric superconductor LaIrSi3 are presented. Powder neutron diffraction confirmed the reported noncentrosymmetric body-centered tetragonal BaNiSn3-type structure (space group I4\,mm) of LaIrSi3. The bulk superconductivity is observed below T_c = 0.72(1) K. The intrinsic \Delta C_e/\gamma_n T_c = 1.09(3) is significantly smaller than the BCS value of 1.43, and this reduction is accounted by the \alpha-model of BCS superconductivity. The analysis of the superconducting state C_e(T) data by the single-band \alpha-model indicates a moderately anisotropic order parameter with the s-wave gap \Delta(0)/k_B T_c = 1.54(2) which is lower than the BCS value of 1.764. Our estimates of various normal and superconducting state parameters indicate a weakly coupled electron-phonon driven type-I s-wave superconductivity in LaIrSi3. The \muSR results also confirm the conventional type-I superconductivity in LaIrSi3 with a preserved time reversal symmetry and hence a singlet pairing superconducting ground state.Comment: 11 pages, 8 figures, 2 table

A Survey of Kansas Physicians' Perceptions of Physician Assistant Education and Qualifications

BACKGROUND: Effective physician-physician assistant (PA) teams improve patient access and satisfaction, and increase productivity and revenue while reducing physician workload. This survey assessed perceptions of Kansas primary care physicians regarding educational requirements and qualifications of PAs, professional and legal regulations, and the most important skills and competencies for PAs to possess. Understanding these perceptions may lead to improved communication and refined expectations of physician-physician assistant teams, thereby increasing their utilization and effectiveness. METHODS: A 20-question survey was emailed to all 1,551 primary care physicians registered with the Kansas Board of Healing Arts in 2012. Descriptive data were reported as frequencies; comparisons between groups were analyzed using Chi-square. RESULTS: The response rate was 9.2% (n = 143). Physicians were highly accurate regarding the program’s generalist/primary care educational model and moderately accurate regarding the degree awarded, average pre-program grade point average, lock-step full-time curriculum, weeks of clinical rotations, recertification and continuing medical education hours, and Medicare PA fee schedule. Physicians had low accuracy regarding program and pharmacology credit hours, strict dismissal policy, pre-program healthcare experience, and co-signatory regulations. Physicians with PA supervisory experience had higher knowledge than those without (p = 0.001). Physicians most commonly selected history taking and performing physical exam as the most important skill (49%) and providing patient care that is patient-centered, efficient, and equitable as the most important competency (42%). CONCLUSIONS: Physicians often underestimated the average PA applicant qualifications, program rigor and intensity, professional regulatory standards, and co-signatory requirements. Correcting misperceptions and improving understanding of which PA skills and competencies are most valued by physicians may optimize PAs as part of the healthcare team

Hamming weights and Betti numbers of Stanley-Reisner rings associated to matroids

To each linear code over a finite field we associate the matroid of its parity check matrix. We show to what extent one can determine the generalized Hamming weights of the code (or defined for a matroid in general) from various sets of Betti numbers of Stanley-Reisner rings of simplicial complexes associated to the matroid

On the conversion of Indians and Heathens

Read a review of Ineke Loots – Joke Spaans (eds.), Johannes Hoornbeeck (1617-1666), On the conversion of Indians and Heathens. An annotated translation ofDe conversione Indorum et gentilium (1669), [Brill’s Studies in Intellectual History 290/21], (Leiden – Boston: Brill, 2018), Johannes Hoornbeeck (1617- 1666), On the conversion of Indians and Heathens, ISBN: 978-90-04-25544-9, List price: Euro 129 / US$ 149

Steady and Stable: Numerical Investigations of Nonlinear Partial Differential Equations

Excerpt: Mathematics is a language which can describe patterns in everyday life as well as abstract concepts existing only in our minds. Patterns exist in data, functions, and sets constructed around a common theme, but the most tangible patterns are visual. Visual demonstrations can help undergraduate students connect to abstract concepts in advanced mathematical courses. The study of partial differential equations, in particular, benefits from numerical analysis and simulation

Fractionation of parietal function in bistable perception probed with concurrent TMS-EEG

When visual input has conflicting interpretations, conscious perception can alternate spontaneously between these possible interpretations. This is called bistable perception. Previous neuroimaging studies have indicated the involvement of two right parietal areas in resolving perceptual ambiguity (ant-SPLr and post-SPLr). Transcranial magnetic stimulation (TMS) studies that selectively interfered with the normal function of these regions suggest that they play opposing roles in this type of perceptual switch. In the present study, we investigated this fractionation of parietal function by use of combined TMS with electroencephalography (EEG). Specifically, while participants viewed either a bistable stimulus, a replay stimulus, or resting-state fixation, we applied single pulse TMS to either location independently while simultaneously recording EEG. Combined with participant’s individual structural magnetic resonance imaging (MRI) scans, this dataset allows for complex analyses of the effect of TMS on neural time series data, which may further elucidate the causal role of the parietal cortex in ambiguous perception