A study of the control problem of the shoot side environment delivery system of a closed crop growth research chamber

The details of our initial study of the control problem of the crop shoot environment of a hypothetical closed crop growth research chamber (CGRC) are presented in this report. The configuration of the CGRC is hypothetical because neither a physical subject nor a design existed at the time the study began, a circumstance which is typical of large scale systems control studies. The basis of the control study is a mathematical model which was judged to adequately mimic the relevant dynamics of the system components considered necessary to provide acceptable realism in the representation. Control of pressure, temperature, and flow rate of the crop shoot environment, along with its oxygen, carbon dioxide, and water concentration is addressed. To account for mass exchange, the group of plants is represented in the model by a source of oxygen, a source of water vapor, and a sink for carbon dioxide. In terms of the thermal energy exchange, the group of plants is represented by a surface with an appropriate temperature. Most of the primitive equations about an experimental operating condition and a state variable representation which was extracted from the linearized equations are presented. Next, we present the results of a real Jordan decomposition and the repositioning of an undesirable eigenvalue via full state feedback. The state variable representation of the modeling system is of the nineteenth order and reflects the eleven control variables and eight system disturbances. Five real eigenvalues are very near zero, with one at zero, three having small magnitude positive values, and one having a small magnitude negative value. A Singular Value Decomposition analysis indicates that these non-zero eigenvalues are not results of numerical error

Use of KAOS in operational digital forensic investigations

Abstract. This paper focuses on the operations involved in the digital forensic process using the requirements engineering framework KAOS. The idea is to enforce the claim that a requirements engineering approach to digital forensics produces reusable patterns for future incidents. Our patterns here will be opera-tion-focused, rather than requirement-focused, which is simpler because the op-erations can potentially be exhaustively enumerated and evaluated. Thus, for example, given the complexity of the Ceglia versus Zuckerberg Facebook case involving alleged document forgery, we can show that one of the benefits com-ing out of the modelling exercise was the set of operations needed. This will give an estimate for the future of what kind of capabilities and resources are needed for other complex document-forgery cases involving computers. It may also help to plan investigations and prioritise the use of resources more widely within the case workload of investigators.

Using a Goal-Driven Approach in the Investigation of a Questioned Contract

Part 3: FORENSIC TECHNIQUESInternational audienceThis paper presents a systematic process for describing digital forensic investigations. It focuses on forensic goals and anti-forensic obstacles and their operationalization in terms of human and software actions. The paper also demonstrates how the process can be used to capture the various forensic and anti-forensic aspects of a real-world case involving document forgery

The MOSS camera on H-1NF

We have configured the modulated optical solid-state spectrometer, a recently developed high-resolution instrument for plasma Dopplerspectroscopy, as an imaging spectroscopiccamera. The camera features a wide field of view (∼10°), large aperture (40 mm), and high spectral resolution ν/Δν greater than 10 000. The camera installation on the H-1NF Heliac is described, together with the steps in the design process, including field widening. Calibration and characterization of the instrument function is discussed and the instrument performance is illustrated with some sample results of spatially resolved ion temperature measurements in H-1NF

Taking Up Space: A Phenomenological Study of the Shared Experiences of Black Women in STEM Graduate Programs at Predominantly White Institutions

In the U.S., marginalized populations are underrepresented in STEM. Specifically, there is a disparity in the number of Black women attaining STEM graduate degrees and entering the STEM workforce. The purpose of this qualitative, phenomenological study was to examine the essence of the shared experiences of Black women currently enrolled in STEM graduate programs at predominantly White institutions (PWIs), in order to increase retention of Black women through STEM graduate programs and into careers; as well as to use participant’s experiences to expose any barriers they encountered related to their educational pursuits, and examine how they were able to navigate those barriers. Critical Race Feminism and Social Cognitive Theory were used as the guiding theoretical framework for this study. Due to the fact that Black women are typically marginalized or excluded in STEM, a critical feminist lens was used to ensure their voices were centered as the focal point of this study. While focusing on Black women in graduate programs, this study comprehensively explored the PK-16+ experiences of Black women and found that: 1) Black women in STEM benefit from opportunities to engage in positive undergraduate research experiences; 2) Black women benefit from opportunities to participate extracurricular activities that foster a sense of belonging and community; 3) Black women are often impacted by the quality of interactions with faculty and mentors, as well as the lack faculty and mentors that they share race and gender identities with; 4) and that there is a need for institutions to embrace a transformational change outlook that ensures STEM learning spaces are diverse, welcoming, inclusive, equitable, and supportive of Black women

Genetic and environmental factors influencing susceptibility to infectious agents

The studies covered in this work have identified both genetic and environmental factors that contribute to susceptibility to infectious agents. The hypotheses proposed to explain the epidemiological studies have provided several new insights into the host-parasite interactions involved in some infectious diseases and provided new approaches to examination of cot deathsPerhaps the major contribution of the work on blood group and secretor status will be identification and characterization of glycoprotein adhesins that use these carbohydrate cell surface components as receptors. One of the major problems in development of vaccines against encapsulated bacteria that cause disease in young children is that infants and children under the age of 5 do not make long-lasting or effective immune responses to polysaccharide antigens. Serotype protein antigens of meningococci are under investigation as vaccines, but will be of limited value. Work in progress in my laboratory has isolated from outer membranes of meningococci and staphylococci protein components with a molecular weight of approximately 60,000 daltons reactive with Lewis3. If the material can be shown to be immunogenic in humans it might be a valuable candidate for vaccines against serogroup B meningococci

Good As We Know It: Goodness in Design Discourse Since 1870

This dissertation examines the ways in which design and design practitioners have defined value in the design discourse through the vocabulary and concept of goodness since 1870. These definitions of value have been central to design discourse both past and present and deal with the impact and purpose of design work as well as its role in the creation of the approaching future. Since before the coalescence of graphic design as a separate field of design, these questions have been tied to the form, function or social impact of the objects created by designers. Despite the prevalence of this line of inquiry in the discourse, current usage tends toward uncritical and uninformed usage because of a separation of the terminology from the historical context in which this conversation developed. The purpose of this investigation, then, is not to segment terms into “right” or “proper” definitions, but to apply a critical historical lens to the vocabulary of goodness as it has been used in the larger design discourse since 1870 in order to better understand the state of current discussions of value and to inform paths of future inquiry. In order to do so, this investigation developed a framework by which to understand the ways in which goodness has been contextualized over the last 150 years. This historical context does not limit us to a historicist approach to design, and it not presented as an essentialist or teleological marker of things to come. Instead, knowledge of the historical context and various uses of a term makes us better educated practitioners of design who are more capable of combating the individualistic fallacy of the enlightened genius. Through a fuller knowledge of the critical historical context in which our field’s vocabulary developed, we can better understand notions of creativity that position designers as expert guides through networks of information and meaning

TMCalc - A fast code to derive Teff and [Fe/H] for FGK stars

We present a new direct spectroscopic calibration for a fast estimation of the stellar metallicity [Fe/H]. These calibrations were computed using a large sample of 451 solar-type stars for which we have precise spectroscopic parameters derived from high quality spectra. The new [Fe/H] calibration is based on weak Fe I lines, which are expected to be less dependent on surface gravity and microturbulence, and require only a pre-determination of the effective temperature. This temperature can be obtained using a previously presented line-ratio calibration. We also present a simple code that uses the calibrations and procedures presented in these works to obtain both the effective temperature and the [Fe/H] estimate. The code, written in C, is freely available for the community and may be used as an extension of the ARES code. We test these calibrations for 582 independent FGK stars. We show that the code can be used as a precise and fast indicator of the spectroscopic temperature and metallicity for dwarf FKG stars with effective temperatures ranging from 4500 K to 6500 K and with [Fe/H] ranging from -0.8 dex to 0.4 dex.Comment: 10 pages, 8 Figures, published in A&