Maize in Nepal: Production Systems, Constraints, and Priorities for Research

Crop Production/Industries, Research and Development/Tech Change/Emerging Technologies,

Comment on "Hara's theorem in the constituent quark model"

It is pointed out that current conservation alone does not suffice to prove Hara's theorem as it was claimed recently. By explicit calculation we show that the additional implicit assumption made in such "proofs" is that of a sufficiently localized current.Comment: 8 pages, Late

Reply to Comment on "Hara's theorem in the constituent quark model"

In the preceding Comment it is alleged that a "hidden loophole" in the proof of Hara's theorem has been found, which purportedly invalidates the conclusions of the paper commented upon. I show that there is no such loophole in the constituent quark model, and that the "counterexample" presented in the Comment is not gauge invariant.Comment: 5 pages, reply to lanl e-print hep-ph/970923

Gravitational Lensing by Wormholes

Gravitational lensing by traversable Lorentzian wormholes is a ew possibility which is analyzed here in the strong field limit. Wormhole solutions are considered in the Einstein minimally coupled theory and in the brane world model. The observables in both the theories show significant differences from those arising in the Schwarzschild black hole lensing. As a corollary, it follows that wormholes with zero Keplerian mass exhibit lensing properties which are qualitatively (though not quantitatively) the same as those of a Schwarzschild black hole. Some special features of the considered solutions are pointed out.Comment: 20 pages, no figure

Validation of Potential Fishing Zone (PFZ) forecasts from Andaman and Nicobar Islands

The annual exploitable fisheries of Andaman and Nicobar Islands are estimated to be 1.48 lakh t of which a meagre 22% is harvested currently. Potential Fishing Zone (PFZ) forecasts based on remotelysensed chlorophyll concentration and sea surface temperature were applied for harvesting the unexploited marine fishery resources. Simultaneous validation experiments (n = 87) synchronizing with PFZ forecasts within (PFZs) and outside (non-PFZs) the demarcated zones employing different vessel categories viz., gillnetters (n = 50), trawlers (n = 22) and longliners (n = 15) were carried out. Significant disparity in fish catch was observed within and outside PFZs. Fish catch from gillnetters composed of carangids, clupeids, scombrids with Megalaspis cordyla being dominant at PFZ. Carangids, sphyraenids, serranids, lutjanids, lethrinids and carcharhinids were reported from trawlers with significantly higher CPUE from PFZs except nemipterids. Fish catch from longliners constituted mainly of carcharhinids and serranids, where the catch of former was found to be significantly higher at PFZs

Examining Perceived Entrepreneurial Stress: A Causal Interpretation through Cross-Lagged Panel Study

The entrepreneurial stress construct’s nomological validity is not well established as past studies have not delineated between entrepreneurial and employee stress. This study investigated several entrepreneurship-specific stressors positing their causal effect on perceived entrepreneurial stress (PES). It examined four directional hypotheses testing the causal, reverse, reciprocal relationships and moderation effects between stressors and PES. Further, it looked at the moderating impact of psychological capital. More than 300 entrepreneurs in emerging markets, namely India, Pakistan, and the United Arab Emirates, participated in this longitudinal study (Time 1 n = 325, Time 2 n = 310). The study adopted a cross-lagged competing model research design and analyzed the data using structural equation modeling (SEM). The results show that entrepreneurship-specific personal, social, and occupational stressors cause PES. Further, the results also support the reverse causal effect of PES on stressors and a reciprocal relationship. The study advances resource-based theory to an entrepreneurial background, highlighting the role of intangible resource gaps in perceived entrepreneurial stress. The study concludes that entrepreneurship-specific intangible resources are useful to entrepreneurs at personal, social, and occupational levels. An actual or perceived loss of these resources may lead to perceived entrepreneurial stress. Furthermore, PES can interfere with the entrepreneurial capacity for innovation over time. Psychological capital can be an effective coping response as a moderator of perceived entrepreneurial stress’ adverse effects. This is one of the first studies that examines PES in an emerging market context, specific to entrepreneurial employment

CeCoIn5 - a quantum critical superfluid

We have made the first complete measurements of the London penetration depth $\lambda(T)$ of CeCoIn5, a quantum-critical metal where superconductivity arises from a non-Fermi-liquid normal state. Using a novel tunnel diode oscillator designed to avoid spurious contributions to $\lambda(T)$, we have established the existence of intrinsic and anomalous power-law behaviour at low temperature. A systematic analysis raises the possibility that the unusual observations are due to an extension of quantum criticality into the superconducting state.Comment: 5 pages, 3 figure

Detubularized isolated ureterosigmoidostomy in a complicated common cloaca: A case report

Urinary incontinence in a child secondary to a severe congenital anatomical disorder or due to complication of a previous surgery can be difficult to manage. Decisions can be especially hard when a redo procedure is being considered. We present one such case where a 6 year old girl previously operated for cloaca was brought with incontinence and after much consideration of options available, underwent a modified ureterosigmoidostomy to aid in her continence. The modification used was detubularized isolated ureterosigmoidostomy, described by Atta et al in 1996

Absence of backscattering at integrable impurities in one-dimensional quantum many-body systems

We study interacting one dimensional (1D) quantum lattice gases with integrable impurities. These model Hamiltonians can be derived using the quantum inverse scattering method for inhomogeneous models and are by construction integrable. Absence of backscattering at the impurities is shown to be the characteristic feature of these disordered systems. The value of the effective carrier charge and the Sutherland-Shastry relation are derived for the half-filled XXX model and are shown to be independent of the impurity concentration and strength. For the half-filled XXZ model we show that there is no enhancement of the persistent currents for repulsive interactions. For attractive interactions we identify a crossover regime beyond which enhancement of the currents is observed.Comment: 14 RevTeX 3.0 pages with 1 PS-figure include