On the molecular mechanism of surface charge amplification and related phenomena at aqueous polyelectrolyte-graphene interfaces

In this communication we illustrate the occurrence of a recently reported new phenomenon of surface-charge amplification, SCA, (originally dubbed overcharging, OC), [Jimenez-Angeles F. and Lozada-Cassou M., J. Phys. Chem. B, 2004, 108, 7286] by means of molecular dynamics simulation of aqueous electrolytes solutions involving multivalent cations in contact with charged graphene walls and the presence of short-chain lithium polystyrene sulfonates where the solvent water is described explicitly with a realistic molecular model. We show that the occurrence of SCA in these systems, in contrast to that observed in primitive models, involves neither contact co-adsorption of the negatively charged macroions nor divalent cations with a large size and charge asymmetry as required in the case of implicit solvents. In fact the SCA phenomenon hinges around the preferential adsorption of water (over the hydrated ions) with an average dipolar orientation such that the charges of the water's hydrogen and oxygen sites induce magnification rather than screening of the positive-charged graphene surface, within a limited range of surface-charge density.Comment: 10 pages, 6 figure

Mediating Conflicting Constructions of Childhood Sexual Experience: A Case Study

This paper describes a case study involving two primary school age children and their sexual experience together. The young girl interpreted the experience as abuse, and the young boy defined the experience as exploration. The cultural, environmental and structural factors which may have contributed to this difference of interpretation are presented. The author discusses the criterion used to distinguish between sexual exploration and sexual abuse between two children and addresses the difficulty in applying these standards to the normal sexual behavior of children. A case study is presented using the constructionist paradigm to mediate the conflicting interpretation of events, so that both definitions of the situation are recognized as authentic. The case study presents a situation where it may be in the best interest of all involved to validate both childrens\u27 perceptions of reality. Finally, the author concludes with a detailed discussion of the mediation methods used to resolve the intractable conflict and the ethical issues raised by their use

The Measurment and Reporting of Human Resources - Its Feasability and Utility

Financial accounting is dynamic. Its generally accepted accounting principles are the result of an evolutionary process that can be expected to continue. Accounting is not an art which is an end in itself, rather it is an activity with a purpose. It is an information system whose principles change in response to changes in economic and social conditions, to new knowledge, and to demands of users for more serviceable financial information. Human Resource Accounting (H.R.A.) is a part of this evolutionary process. It is a response to a need for information in an area previously considered to be outside the realm of accounting. It is an effort to quantify a resource considered qualitative First the author will examine the force behind H.R.A. which has led accountants to question the adequacy of the traditional accounting model which ignores the human resource. The benefits of an increased awareness of the human resource through H.R.A. will be presented in the utility of human resource information. Because H.R.A. is in the developmental stage there is no one model which has been accepted as an authoritative means to value the resource. H.R.A. measurement will consider several proposals and question their theoretical basis. The process of change is an evolutionary one, i t therefore moves slowly. Each step must be critically reviewed. The section Feasability of Human Resource Accounting will serve this purpose as well as provide a summary of the concep

Bvr-1, a Restriction Locus of a Type C RNA Virus in the Feline Cellular Genome: Pleiotropic Restriction of Endogenous BALB Virus in Cat x Mouse Somatic Cell Hybrids

Bvr-1 is a dominant X-linked feline gene which restricts the replication of B-tropic murineleukemia virus (B-MuLV) in somatic cell hybrids between murine BALB/c-RAG cells and FL-74 feline cells. Since the hybrids were originally derived by the hypoxanthine aminopterin thymidine selection scheme, counter selection experiments on 6-thioguanine result in preferential survival of hybrid cells which have spontaneously lost the feline X-chromosome on which is located the structural gene for hypoxanthine guanine phosphoribosyl transferase (IMP: pyrophosphate phosphoribosyl transferase, E.C. 2.4.2.8) and Bvr-1. Back selected Bvr-1- cells express high parental levels of B-MuLV. Bvr-1- effectively restricts the IdU-mediated induction of the endogenous xenotropic BALB virus (BALB: virus 2) but not the endogenous N-tropic virus (BALB: virus 1). Pleiotropic restriction of B-MuLV and X-MuLV, but not N-MuLV suggests that the viral targets of Bvr-1 (either viral components or functions in viral assembly) of the B-tropic and X-tropic endogenous BALB viruses are similar to each other but distinct from the target in the N-tropic virus. Very low levels of B-MuLV are detected in restricted cells, but this residual virus is not infectious in either NIH-3T3 or BALB-3T3 mouse cells which are genotypically Fv-1N/Fv-1N and Fv-1B/Fv-1B, respectively. Passage of residual virus through host cells without Fv-1 related restriction (SC-1) results in production of infectious B-MuLV indistinguishable from that produced by RAG parent cells

Nanoelectromechanical Resonator Arrays for Ultrafast, Gas-Phase Chromatographic Chemical Analysis

Miniaturized gas chromatography (GC) systems can provide fast, quantitative analysis of chemical vapors in an ultrasmall package. We describe a chemical sensor technology based on resonant nanoelectromechanical systems (NEMS) mass detectors that provides the speed, sensitivity, specificity, and size required by the microscale GC paradigm. Such NEMS sensors have demonstrated detection of subparts per billion (ppb) concentrations of a phosphonate analyte. By combining two channels of NEMS detection with an ultrafast GC front-end, chromatographic analysis of 13 chemicals was performed within a 5 s time window

Natural resources inventory and monitoring in Oregon with ERTS imagery

Multidiscipline team interpretation of ERTS satellite and highflight imagery is providing resource and land use information needed for land use planning in Oregon. A coordinated inventory of geology, soil-landscapes, forest and range vegetation, and land use for Crook County, illustrates the value of this approach for broad area and state planning. Other applications include mapping fault zones, inventory of forest clearcut areas, location of forest insect damage, and monitoring irrigation development. Computer classification is being developed for use in conjunction with visual interpretation

Trends of Non-Fatal HEMS Accident-Related Injuries

We conducted an investigation into non-fatal helicopter emergency medical service accidents from January 26, 1991 to April 26, 2018 via the National Transportation Safety Board aviation accident database. Over this 28-year timeframe 247 accidents results in 251 fatalities and 179 non-fatal injuries. Exploratory analysis of the data indicate that more non-fatal injuries occurred in September compared to any other month during the study timeframe. Exploratory correlational analysis via elastic net logistic regression concluded that no linear relationship of NTSB accident database data provide insights into what factors are correlated with an increased likelihood of non-fatal injuries. Further, no linear relationships of available variables provide insights into the increased number of non-fatal injuries in September during this investigation’s timeframe. Future research should identify if these null results are due to a true lack or no relationship between available data and non-fatal injuries or if these results are due to inaccessibility to relevant data