A case study of argumentation at undergraduate level in history

This article examines two essays by undergraduate students in the first year of study in History at a university in the UK. It also draws on documentary evidence from the department in question and interviews with the students themselves to paint a picture of the way argumentation operates at this level. While no firm conclusions can be drawn, the evidence suggests a department with a high degree of awareness of the importance of argument and argumentation in studying History; and students who are aware and articulate about the problem facing them in constructing essays in the discipline. Suggestions are made about induction into the epistemological and argumentative demands of undergraduate study

Preliminary X-ray diffraction analysis of YqjH from Escherichia coli: a putative cytoplasmic ferri-siderophore reductase

YqjH is a cytoplasmic FAD-containing protein from Escherichia coli; based on homology to ViuB of Vibrio cholerae, it potentially acts as a ferri-siderophore reductase. This work describes its overexpression, purification, crystallization and structure solution at 3.0 A resolution. YqjH shares high sequence similarity with a number of known siderophore-interacting proteins and its structure was solved by molecular replacement using the siderophore-interacting protein from Shewanella putrefaciens as the search model. The YqjH structure resembles those of other members of the NAD(P)H:flavin oxidoreductase superfamily

The transient response of global-mean precipitation to increasing carbon dioxide levels

The transient response of global-mean precipitation to an increase in atmospheric carbon dioxide levels of 1% yr(-1) is investigated in 13 fully coupled atmosphere-ocean general circulation models (AOGCMs) and compared to a period of stabilization. During the period of stabilization, when carbon dioxide levels are held constant at twice their unperturbed level and the climate left to warm, precipitation increases at a rate of similar to 2.4% per unit of global-mean surface-air-temperature change in the AOGCMs. However, when carbon dioxide levels are increasing, precipitation increases at a smaller rate of similar to 1.5% per unit of global-mean surface-air-temperature change. This difference can be understood by decomposing the precipitation response into an increase from the response to the global surface-temperature increase (and the climate feedbacks it induces), and a fast atmospheric response to the carbon dioxide radiative forcing that acts to decrease precipitation. According to the multi-model mean, stabilizing atmospheric levels of carbon dioxide would lead to a greater rate of precipitation change per unit of global surface-temperature change

Forcing and response in simulated 20th and 21st century surface energy and precipitation trends

A simple methodology is applied to a transient integration of the Met Office Hadley Centre Global Environmental Model version1 (UKMO-HadGEM1) fully coupled atmosphere-ocean general circulation model in order to separate forcing from climate response in simulated 20th century and future global mean surface energy and precipitation trends. Forcings include any fast responses that are caused by the forcing agent and that are independent of global temperature change. Results reveal that surface radiative forcing is dominated by shortwave forcing over the 20th and 21st centuries, which is strongly negative. However, when fast responses of surface turbulent heat fluxes are separated from climate feedbacks, and included in the forcing, net surface forcing becomes positive. The nonradiative forcings are the result of rapid surface and tropospheric adjustments and impact 20th century, as well as future, evaporation and precipitation trends. A comparison of energy balance changes in eight different climate models finds that all models exhibit a positive surface energy imbalance by the late 20th century. However, there is considerable disagreement in how this imbalance is partitioned between the longwave, shortwave, latent heat and sensible heat fluxes. In particular, all models show reductions in shortwave radiation absorbed at the surface by the late 20th century compared to the pre-industrial control state, but the spread of this reduction leads to differences in the sign of their latent heat flux changes and thus in the sign of their hydrological responses

Innovative Secure eVoting System

Recent elections have highlighted the need for a more robust and error proof method of counting votes. An increasing number of studies find that the currently available commercial electronic voting machines have multiple security flaws. The lax security and lack of redundancy can, and possibly has, illegally disenfranchised voters by the dropping or mis-recording of votes. This project attempts to build an electronic balloting system that corrects the shortcomings of competing systems. An open and redundant project would solve many of the problems. The eVoting project is based on a client-server network architecture comprised of multiple ballot machines networked to a server machine. System authentication security prevents the unauthorized addition of rogue systems into the network before or during the vote. Vote data are encrypted during transmission from machines to prevent network sniffing. Many current systems have no paper trail; the proposed system features physical vote printouts as a backup in addition to the separate encrypted databases. The proposed system is currently being constructed with the intent of deployment into an actual voting environment

A brief study of the place of the computer in the library

When considering adapting the computer to library use, there appear to be four general areas where usage would be most practical. The first area might be labeled library housekeeping operations, which would include the ordering and receiving of monographs and serials, circulation control of library items and preparation of catalogs and listings of many kinds. The second area would consist of cataloging and allied content analysis operations designed to assign to each item subject identifiers, as well as call number or related classification information. The third area would be composed of storage and retrieval operations, which make it possible for the user to obtain access to the desired informational items in response to appropriate requests. The final area would comprise collection control operations designed to insure an orderly collection development through additions and deletions of materials and file changes when necessary.

Which rhizobia nodulate which legumes in New Zealand soils?

Recent work which genotypically characterised rhizobia of native, crop and weed legumes in New Zealand and examined their cross-nodulation ability is reviewed and related to earlier work with focus on New Zealand pasture systems. The New Zealand native legumes were exclusively effectively nodulated by novel strains of Mesorhizobium which did not nodulate crop or weed legumes. Clovers, lucerne, Lotus and grain legumes were effectively nodulated by different genera, species and biovars of rhizobia primarily originating from inoculum. Rhizobial symbionts of white clover have established over wide areas in New Zealand. Weed legumes are effectively nodulated by different genera/species of rhizobia depending on species. Bradyrhizobia that cross-nodulate lupins, gorse, European broom and tagasaste are widespread in New Zealand

An assessment of precipitation adjustment and feedback computation methods

The precipitation adjustment and feedback framework is a useful tool for understanding global and regional precipitation changes. However, there is no definitive method for making the decomposition. In this study we highlight important differences which arise in results due to methodological choices. The responses to five different forcing agents (CO2, CH4, SO4, black carbon, and solar insolation) are analyzed using global climate model simulations. Three decomposition methods are compared: using fixed sea surface temperature experiments (fSST), regressing transient climate change after an abrupt forcing (regression), and separating based on timescale using the first year of coupled simulations (YR1). The YR1 method is found to incorporate significant SST-driven feedbacks into the adjustment and is therefore not suitable for making the decomposition. Globally, the regression and fSST methods produce generally consistent results; however, the regression values are dependent on the number of years analyzed and have considerably larger uncertainties. Regionally, there are substantial differences between methods. The pattern of change calculated using regression reverses sign in many regions as the number of years analyzed increases. This makes it difficult to establish what effects are included in the decomposition. The fSST method provides a more clear-cut separation in terms of what physical drivers are included in each component. The fSST results are less affected by methodological choices and exhibit much less variability. We find that the precipitation adjustment is weakly affected by the choice of SST climatology

Examining the effects of acquired limb loss on the family network: a grounded theory study

Background: Individuals with acquired limb loss are faced with various challenges. Family networks become important in facilitating coping and recovery, but the limited research into their own experiences has so far only examined spousal and parental carers. Aims: This research aimed to: understand the experiences of acquired limb loss from the perspective of the family network; and to develop a theoretical model to explain how they experience limb loss of the other. The use of ‘network’ was adopted to include kin self-identified as family. Method: Participants (n = 14) were recruited nationally. Interviews were conducted in a process moving from unstructured, semi-structured and structured interviews, using Grounded Theory method. Findings: A theoretical model was developed around the interaction of five core categories. Families witness the difficulties faced by the person with limb loss, leading to a responsibility to provide support. Families subsequently experience various challenges of limb loss; together with numerous emotional reactions. Various forms of coping are used in order to resolve these experiences. Conclusions: Families are involved in the processes and challenges of an amputation in another family member, regardless of aetiology, gender or relationship structure. The theoretical model can be understood through the integration of existing research. The issues identified indicate potential considerations for services supporting such families.IMPLICATIONS FOR REHABILITATION The challenges and emotions experienced by family members have potential consequences for the support offered to the person with limb loss. This could ultimately influence the physical and psychological rehabilitation of the person with limb loss. Services should support families in witnessing difficulties in the person with limb loss, adjusting to relational changes and managing health care systems