Seat shock test stand development

The UNLV CMEST (The Center for Mechanical & Environment Systems Technology) lab and Army Research Labs have undertaken a research project to develop a seat system that will reduce the level of shock introduced into the bottom of a seat when a vehicle trips a land mine. In order to develop the seat system, a test stand was designed using an air cannon to fire a 5 pound steel slug at an impact plate, creating a high acceleration impulse or shock. The shock from the slug impact is redirected from the horizontal plane to the vertical plane through a pinned rocker assembly designed to strike the bottom of the seat; The test stand was designed with the aid of LS-DYNA, a finite element code capable of modeling the deformations and stresses in dynamic systems. Materials used to construct the test stand were simulated in the model to determine if they are able to withstand the impact from the slug. The LS-DYNA model was used to determine possible acceleration levels output by the test stand in different testing configurations. After completing the construction of the stand, the computer models were verified by comparing the simulated results to experimental testing data. Testing was completed in the CMEST lab using a data collection system and high G accelerometers. (Abstract shortened by UMI.)

Membership Drive Success: ALA/Alabama\u27s Support Staff Pilot Initiative

Many professional associations are grappling with membership challenges. Recently, the American Medical Association (AMA) adopted a strategy they termed the “member-centered” approach (Romano, 2004). One feature of this approach designed to boost membership is teaming with state and specialty societies. The American Medical Association believes that “future cooperation and collaboration with state associations is vital to any membership turnaround” (Romano, 2004, p. 11). This partnership makes good business sense. The American Library Association considers a cooperative venture with state associations as an important avenue to increase membership as well. Taking to heart the COPE recommendations and incorporating the idea of partnerships with state associations, ALA created a new membership option targeting library support staff at the state level. Alabama is the first state in which ALA will launch this cooperative endeavor. This article describes the joint staff membership initiative between a state association, the Alabama Library Association (ALLA), and the American Library Association – a unique pilot program already beginning to spread nationwide

Evgenij Akel´ev, Povsednevnaja žizn´ vorovskogo mira Moskvy vo vremena Van´ki Kaina

The popular Molodaia Gvardia “Living History” book series on everyday life, now approaching 100 titles, is a baggy collection of histories and current events. Some of its history books are not the new social or cultural studies suggested by the series title but merely standard accounts with the fashionable label “everyday life” tacked on. Others are rehashes of gossipy court or high society studies. But a few are genuinely original, powerful works of historical excavation. A recent addition t..

Implicit Questions in Michael Confino’s Essay

AbstractThe essay commends Michael Confino’s challenging criticisms over many years of the conceptualizations commonly used by historians of Russia. David L. Ransel agrees with the criticisms of the soslovie paradigm advanced by Confino in his recent essay. Ransel suggests that by adapting the soslovie to class conceptualization of Russia’s modernization, historians may have missed seeing a more fruitful and instructive conceptualization, one usually associated with Ibero-Latin regimes rather than Russia, namely, the development of Russia from a patrimonial state to a corporate state and society. Ransel also points out the obstacles presented by the soslovie paradigm for understanding of the micro-dynamics of Russian history. The soslovie paradigm tends to blind scholars to a feature of Russian life that Confino himself had commented on many years ago: Russians of all social statuses lived in close proximity and interacted daily. Ransel gives examples from his own work and the work of others and calls for more study of the micro-dynamics of Russian history.RésuméLe présent essai appuie les critiques stimulantes formulées par Michael Confino pendant de nombreuses années sur les conceptualisations communément utilisées par les historiens de la Russie. L’auteur admet les critiques de la notion de soslovie avancées par Confino dans son dernier article (CMR, 49 (4), 2008). Il laisse entendre qu’en adoptant le modèle selon lequel la modernisation de la Russie se serait opérée par le passage d’une société de soslovija à une société de classes, les historiens ont pu passer à côté d’une autre conceptualisation plus fructueuse et édifiante, associée d’ordinaire aux régimes latino-américains et ibériens plutôt qu’à la Russie, à savoir, le développement de la Russie par le passage d’un État patrimonial à un État et une société corporatistes. L’auteur pointe également les obstacles que soulève la notion de soslovie dans la compréhension de la microdynamique de l’histoire russe. La notion de soslovie tend à masquer un aspect de la vie russe que Confino lui-même avait commenté il y a longtemps déjà : les Russes de tous statuts sociaux vivaient en proximité étroite et étaient en contact quotidiennement. L’auteur propose des exemples extraits de différents travaux, dont les siens, et invite à utiliser davantage l’approche microdynamique de l’histoire russe

Revealing the Interplay Between Covalent and Non-Covalent Interactions Driving the Adsorption of Monosubstituted Thiourea Derivatives on the Au(111) Surface

“This document is the Accepted Manuscript version of a Published Work that appeared in final form in The Journal of Physical Chemistry C, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see: https://pubs.acs.org/doi/10.1021/acs.jpcc.0c00729This work reports a detailed study of the adsorption of thiourea and seven monosubstituted thiourea derivatives on the Au(111) surface based on self-consistent periodic density functional theory (DFT) calculations. We included in our analysis the most stable cis and trans configurations for each considered monosubstituted derivative. Different functional groups have been selected for the derivatives in order to address the electron-donating/withdrawing effect on the strength of the molecule–metal interaction. The comparison of the cis- and trans-derivatives revealed interactions of different nature between the molecules and the Au(111) surface. We have been able to disentangle these interactions analyzing the charge density difference plots, the projected density of states (pDOS) and the Non-Covalent Interactions (NCI). For the non-substituted thiourea and all the studied derivatives, besides the strong S–Au bond, it has been observed an Au···H–N interaction similar to a hydrogen bonding, which is caused by the charge transfer from the molecules to the Au(111) surface inducing a charge counterbalancing: Auδ−Hδ+Nδ−. Furthermore, π–Au interactions between the functional group of the derivatives and the Au(111) surface, mainly observed for the cis-derivatives, were highlighted by the NCI plots. In some particular cases it was also possible to distinguish long-range interactions of the type lone pair–Au. The present results provide insight into a new kind of organic molecule–metal surface interaction, opening the way for the synthesis of potential nanodevices with diverse applications such as sensing (biosensors or atmospheric sensors), optoelectronics, pollution control, or energy conversionThis work was partially supported by the “Proyecto Nacional de Ciencias Básicas”, Cuba Code P223LH001-079 “Absorción de moléculas organosulfuradas en superficies métalicas” and by Project CTQ2016-76061-P of the Spanish Ministry of Science and Innovation. S.D.-T. acknowledges financial support from the Spanish Ministry of Science and Innovation, through the “María de Maeztu” Programme for Units of Excellence in R&D (CEX2018-000805-M). M.P.H. would like to thank DGAPAUNAM for a 4-month fellowship through Programa de Estancias de Investigación en la UNAM (PREI

Synergy effects in heavy metal Ion chelation with aryl- and aroyl-substituted thiourea derivatives

Detection and removal of metal ion contaminants have attracted great interest due to the health risks that they represent for humans and wildlife. Among the proposed compounds developed for these purposes, thiourea derivatives have been shown as quite efficient chelating agents of metal cations and have been proposed for heavy metal ion removal and for components of high-selectivity sensors. Understanding the nature of metal-ionophore activity for these compounds is thus of high relevance. We present a theoretical study on the interaction between substituted thioureas and metal cations, namely, Cd2+, Hg2+, and Pb2+. Two substituent groups have been chosen: 2-furoyl and m-trifluoromethylphenyl. Combining density functional theory simulations with wave function analysis techniques, we study the nature of the metal-thiourea interaction and characterize the bonding properties. Here, it is shown how the N,N′-disubstituted derivative has a strong affinity for Hg2+, through cation-hydrogen interactions, due to its greater oxidizing capacityR.B. acknowledges Fundación Carolina, Spain, for a Ph.D. fellowship. This work was partially supported by the MICINN, Spanish Ministry of Science and Innovation, project PID2019-110091GB-I00 and the “María de Maeztu” Program for Centers of Excellence in R&D (CEX2018-000805-M