Piloting melt synthesis and manufacturing processes to produce c‐lifepo4: preface

Since Goodenough's team laid the foundation to apply LiFePO₄ as an alternative to lithium cobalt oxide for Li‐ion positive electrodes,^[1,2] Web of Science (WoS)^[3] has indexed over 6000 articles related to lithium iron phosphate—LFP. Manufacturers synthesize LFP with both solid state and solvent assisted hydrothermal technology. Both have their advantages and disadvantages but society requires inexpensive batteries for automobile applications and fixed electrical storage. Here we scale up each step of the nascent melt synthesis process, which has the potential to displace the current commercial technology because of its superior economics related to raw materials. The research challenges include raw material selection, melt synthesis conditions, thermodynamics, micronization to form nano‐powders, followed by spray drying, and carbon coating.     

The schema-driven chameleon: How mimicry affects executive and self-regulatory resources.

The authors propose that behavioral mimicry is guided by schemas that enable efficient social coordination. If mimicry is schema driven, then the operation of these schemas should be disrupted if partners behave in counternormative ways, such as mimicking people they generally would not or vice versa, rendering social interaction inefficient and demanding more executive and self-regulatory resources. To test this hypothesis, Experiments 1–3 used a resource-depletion paradigm in which participants performed a resource-demanding task after interacting with a confederate who mimicked them or did not mimic them. Experiment 1 demonstrated impaired task performance among participants who were not mimicked by a peer. Experiments 2 and 3 replicated this effect and also demonstrated a significant reversal in social contexts where mimicry is counternormative, suggesting that inefficiency emerges from schema inconsistency, not from the absence of mimicry per se. Experiment 4 used a divided attention paradigm and found that resources are taxed throughout schema-inconsistent interactions. These findings suggest that much-needed resources are preserved when the amount of mimicry displayed by interacting individuals adheres to norms, whereas resources are depleted when mimicry norms are violated. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Ecosystem change and population declines in gulls: Shifting baseline considerations for assessing ecological integrity of protected areas

In Lake Superior's Pukaskwa National Park (PNP) in northern Ontario, Canada, herring gull (Larus argentatus) population size is used as an indicator of ecological integrity. Since the 1970s, gull populations have declined by 70% suggesting deteriorating park conditions. However, most other rated park indicators show stable or positive trends. Here, we focus on reconciling these seemingly disparate trends through a better understanding of factors regulating PNP gull populations. Lake-wide declines in surface-schooling prey fish may be limiting aquatic food resources for PNP gulls. To investigate this, we examined gull population trends in different parts of the park in the context of food availability. Gull diets were assessed using regurgitated pellets, egg stable isotopes (nitrogen, carbon) and fatty acids. Population declines were more severe in southern PNP compared to northern PNP and inter-region differences in bird diets likely contributed to these population trends. Gulls in the south relied to a greater extent on dwindling aquatic food resources, i.e., prey fish, while birds in northern PNP supplemented their diets with anthropogenic foods, i.e., garbage. Recognizing that regional declines in aquatic food availability have occurred across eastern Lake Superior is important for the interpretation of PNP gull population trends. Wide-scale ecological changes affecting PNP suggest that factors limiting PNP's herring gull population are not park-specific but, instead, reflect broader ecosystem-wide changes. Defining an appropriate threshold based on current knowledge of ecological conditions on Lake Superior is critical for using herring gull populations as an indicator of park ecological integrity.     

Effect of Grain Boundaries on the Lattice Thermal Transport Properties of Insulating Materials: A Predictive Model

We present two theoretical models to predict the lattice thermal conductivity degradation of insulating materials at high temperature (above one‐third of the Debye temperature). This degradation is due to the presence of grains, with known sizes and shapes, inducing thermal resistance at their boundaries. The first model is derived directly from the kinetic theory of gases (KTG). The formulation of the second is based on a localized continuum model (LCM), assuming phonon Umklapp scattering and the Debye approximation of phonon density of state. The two proposed models are purely predictive, as no experimental information related to the grain size dependence of the thermal conductivity is necessary for the parameterization of the models. The predictive accuracy of the two proposed models is tested on several different types of electrically insulating compounds. Although the model derived from the KTG is similar to the well‐known Kapitza thermal resistance formalism, it fails to predict the grain size dependence of the lattice thermal conductivity. The one derived from a LCM is a new formalism predicting, with good accuracy, the lattice thermal conductivity as a function of the average grain size. It is applicable for microstructures with a grain size typically above 20–50 nm.     

Resolvability and the upper dimension of graphs

For an ordered set W = {w₁, w₂,…, w_k} of vertices and a vertex v in a connected graph G, the (metric) representation of v with respect to W is the k-vector r(v | W) = (d(v, w₁), d(v, w₂),…, d(v, w_k)), where d(x, y) represents the distance between the vertices x and y. The set W is a resolving set for G if distinct vertices of G have distinct representations. A new sharp lower bound for the dimension of a graph G in terms of its maximum degree is presented.

A resolving set of minimum cardinality is a basis for G and the number of vertices in a basis is its (metric) dimension dim(G). A resolving set S of G is a minimal resolving set if no proper subset of S is a resolving set. The maximum cardinality of a minimal resolving set is the upper dimension dim⁺(G). The resolving number res(G) of a connected graph G is the minimum k such that every k-set W of vertices of G is also a resolving set of G. Then 1 ≤ dim(G) ≤ dim⁺(G) ≤ res(G) ≤ n − 1 for every nontrivial connected graph G of order n. It is shown that dim⁺(G) = res(G) = n − 1 if and only if G = K_n, while dim⁺(G) = res(G) = 2 if and only if G is a path of order at least 4 or an odd cycle.

The resolving numbers and upper dimensions of some well-known graphs are determined. It is shown that for every pair a, b of integers with 2 ≤ a ≤ b, there exists a connected graph G with dim(G) = dim⁺(G) = a and res(G) = b. Also, for every positive integer N, there exists a connected graph G with res(G) − dim⁺(G) ≥ N and dim⁺(G) − dim(G) ≥ N.     

Automatic activation of impression formation and memorization goals: Nonconscious goal priming reproduces effects of explicit task instructions.

According to the auto-motive model (J. A. Bargh, 1990), intentions and goals are represented mentally and, as representations, should be capable of nonconscious activation by the environmental context (i.e., "priming"). To test this hypothesis, the authors replicated 2 well-known experiments that had demonstrated differential effects of varying the information-processing goal (impression formation or memorization) on processing the identical behavioral information. However, instead of giving participants the goals via explicit instructions, as had been done in the original studies. the authors primed the impression formation or memorization goal. In both cases, the original pattern of results was reproduced. The findings thus support the hypothesis that the effect of activated goals is the same whether the activation is nonconscious or through an act of will. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

Recension des études utilisant un échantillon probabiliste sur la santé des personnes gaies, lesbiennes et bisexuelles.

Reviews of empirical studies examining the health of gay, lesbian and bisexual individuals (GLB) led to contradictory findings about the prevalence of health problems in this population. These studies employed non probability sampling and suffered from a number of methodological shortcomings that could explain the contradictory findings. Given that many recently published studies on GLB health employed probability sampling and used health measures with good psychometric properties, a comprehensive review of these studies could help to draw a more coherent picture of GLB individuals' health. Objectives: a) To catalogue studies that employed probability sampling and compared the health of individuals of different sexual orientations; b) to describe methodological characteristics of these studies; and c) to examine the convergence of the findings regarding GLB health. Method: Using medical sciences, psychology and sociology databases, 32 publications were identified and catalogued using a coding system enabling content, method, and metric properties classification. Two independent judges conducted the analyses of the documents. Results: As compared to studies not using probability sampling, studies using probability sampling had fewer methodological shortcomings and more coherent findings on GLB health. There were higher proportions of GLB individuals, relative to heterosexual individuals, who reported suicide attempts, high levels of psychological distress, substance abuse, and incidence of victimization. Conclusion: The probability sample studies on GLB health showed robust findings suggesting that the GLB population is vulnerable. Because no empirical findings have documented that homosexuality per se is a cause of illness, future studies should identify the environmental factors likely to account for the higher prevalence of health problems in the GLB population relative to the heterosexual population. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

The Forest, the Trees, and the Chameleon: Context Dependence and Mimicry.

Three studies examined the relation between context dependence in information processing and behavioral mimicry. In Experiment 1, a field-dependent cognitive style was related to a greater tendency to mimic a target's behavior. In Experiment 2 context dependence was experimentally manipulated, and results showed more mimicry in the session where a context-dependent processing style was induced compared with the session where a context-independent processing style was induced. Experiment 3 provided evidence for bidirectionality in the relation between context dependence and mimicry. Specifically, participants whose posture and behavior had been unobtrusively mimicked by an experimenter subsequently processed information in a more context-dependent manner than did nonmimicked participants. Taken together, these results illustrate the interplay between basic cognitive and behavioral processes. (PsycINFO Database Record (c) 2010 APA, all rights reserved)