2,467 research outputs found
Difference points in extractive and reactive cascades. II — Generating design alternatives by the lever rule for reactive systems
No full textUsing linear combinations of vectors in composition space, we formulate a lever rule for reactive distillation columns. This lever rule facilitates the proposal of alternative sequences of reactive distillation systems by allowing us to visualize how material balance constraints move as a Function of reaction "turnover". our approach uses the concept of a pseudo-feed, which is the composition that results from mixing column distillate and bottom products. Our lever rule for reactive distillation columns uses linear combinations of so-called reaction difference points, stoichiometric coefficient vectors of reactants and products, and composition vectors. When a reaction causes no change in the total number of moles, the reaction difference point moves to infinity (Hauan, Omtveit & Lien (1996). Paper 5f, A.I.Ch.E. Annual Meeting, Chicago, Hauan, Westerberg & Lien (1999a). Chemical Engineering Science, 55(6), 1053-1075, Hauan, Ciric, Westerberg & Lien (1999b). Chemical Engineering Science, in press). We show how to carry out all geometric constructions entirely within a finite composition domain by decomposing the total stoichiometric coefficient vector into product and reactant stoichiometric coefficient vectors. In this case the lever rule compares distances along two parallel vectors. For an infinite extractive difference point (Westerberg & Wahnschafft (1996). Advances in Chemical Engineering, 23, 63-170) we can confine all geometric manipulations when proposing alternative reactive distillation processes to a finite composition domain by combining the vectors in a different order. (C) 2000 Elsevier Science Ltd. All rights reserved
Westerberg, B W, 420319
No full textThis record was harvested from a previous catalogue system and will be withdrawn in 2025. Information in this record may be superseded or incomplete. Visit this record in UMA's new catalogue at: https://archives.library.unimelb.edu.au/nodes/view/425027Surname: WESTERBERG. Given Name(s) or Initials: B W. Military Service Number or Last Known Location: 420319. Missing, Wounded and Prisoner of War Enquiry Card Index Number: 50503.250885
Item: [2016.0049.57288] "Westerberg, B W, 420319
Portrait of Westerberg Family
No full textCopy negative of the Westerberg Family posing for a Christmas card.In the middle of the card is an image of the family seated in front of the fireplace while the mother reads to the three children and the father watches
Experimental quantum cosmology in time-dependent optical media
No full textIt is possible to construct artificial spacetime geometries for light by using intense laser pulses that modify the spatiotemporal properties of an optical medium. Here we theoretically investigate experimental possibilities for studying spacetime metrics of the form . By tailoring the laser pulse shape and medium properties, it is possible to create a refractive index variation that can be identified with . Starting from a perturbative solution to a generalized Hopfield model for the medium described by an , we provide estimates for the number of photons generated by the time-dependent spacetime. The simplest example is that of a uniformly varying that therefore describes the Robertson–Walker metric, i.e. a cosmological expansion. The number of photon pairs generated in experimentally feasible conditions appears to be extremely small. However, large photon production can be obtained by periodically modulating the medium and thus resorting to a resonant enhancement similar to that observed in the dynamical Casimir effect. Curiously, the spacetime metric in this case closely resembles that of a gravitational wave. Motivated by this analogy, we show that a periodic gravitational wave can indeed act as an amplifier for photons. The emission for an actual gravitational wave will be very weak but should be readily observable in the laboratory analogue
Network Security in Zero Trust
No full textYritysverkot ovat perinteisesti olleet suljettuja verkkoja, joissa pääsynhallinta on sijannut pääosin verkon reunalla. Pääsy yrityksen verkkoon on tarkoittanut pääsyä myös yrityksen sisäisiin palveluihin. Nykyään, kun yritykset käyttävät entistä enemmän pilvipohjaisia palveluita, tämä lähestymistapa ei enää ole riittävä.
Zero Trust -konseptin pääperiaate on poistaa luottamus verkosta itsestään ja siirtyä verkon suojaamisesta palveluiden ja sovellusten suojaamiseen. Tässä työssä tutkitaan, miten yritys voisi hyödyntää Zero Trust -konsepteja verkon toteutuksessa sekä mikä vaikutus sillä on perinteisiin verkon tietoturvatoteutuksiin.
Tutkimus toteutettiin kokeellisena tutkimuksena, jossa kuvattiin ylätasolla kuvitteellisen yrityksen perinteisen verkon tietoturvamalli sekä sen toteutus Zero Trust -konseptilla esimerkkitoteutuksen kautta. Tutkimuksessa kuvataan Zero Trust -konseptiin liittyvää teoriaa sekä esitellään sen toteuttamiseen liittyviä käytännön lähestymistapoja.
Tutkimuksessa vertaillaan Zero Trust -esimerkkitoteutusta perinteisiin tietoturvamalleihin. Tutkimus tehtiin kuvaten aiheeseen liittyviä konsepteja ylätasolla, ja se ottaa enemmän kantaa Zero Trust -konseptin mahdollisiin toteutusmalleihin kuin tuotteiden ominaisuuksiin.
Tutkimuksen lopputuloksena todetaan, että Zero Trust -konsepteja käyttämällä yritys voi lisätä verkon tietoturvaa. Konseptin käyttöönotto kuitenkin vaatii yrityksiltä panostusta, sillä käyttöönotto vie aikaa ja perinteisen verkon tietoturvamallia joudutaan pitämään usein yllä samanaikaisesti Zero Trust -konseptin käyttöönoton ajan. Tämä luo yritykselle päällekkäisiä kustannuksia käyttöönoton ajan.Enterprise IT networks have traditionally been closed networks with access controls mostly in network edges. Access to internal network has given automatically access to internal services as well. While companies have started to utilize more and more cloud-based services, this approach has become obsolete.
Key concept for Zero Trust is to remove trust element from network itself and focus on protecting the services and applications. Objective was to investigate if Zero Trust concepts could be utilized in enterprise to implement network security and observe how it would affect the traditional network security perimeter.
Research was implemented as constructive research, modelling an example Zero Trust implementation as a case study for imaginary company with traditional network security controls. Research approach was theoretical, first explaining the Zero Trust theory and describing different implementation approaches.
Later, the example Zero Trust implementation was evaluated against traditional network security models and standards to see how they compared. Research was kept in a high-level, focusing rather on Zero Trust concepts and principles instead of commercial Zero Trust products and their features.
It was concluded that Zero Trust concepts could be used to improve network security. While transforming into Zero Trust Enterprise, companies would have to run their traditional network security setup in parallel. Zero Trust implementation would not bring immediate monetary savings, but could offer instant security improvements compared to traditional network security designs
Face Category Differentially Influences Face Memories After a Delay
No full textThis dataset includes face memory data for 48 Caucasian and 48 Hispanic participants who took memory tests for Caucasian and Hispanic faces during two sessions, separated by 2 days. Sleep questionnaire data from the night before session one, and the two intervening nights between sessions 1 and 2 are also included
To meet on the Inside: A study of the use of Piteå municipality’s intranet
No full textToday’s society has become more and more digitalized and we have access to more information than ever before. This has had a major impact on organizations and their work processes. For example have intranets become a common technical groupware to communicate and get relevant information from inside the organization. A common problem related to this is an over-reliance on the technology, where there's not taking into account that some informal and communicative means are difficult to occur through digital resources. The aim of this study is to examine the use of an intranet in a municipality, which consists of many different employees with various work situations. The focus in the study is to investigate how the members use the intranet and their view of the information access. The aim is also to study if there are any differences in the opinions between the employees and the managers. The empirical material is collected through a quantitative method, more particularly web surveys. Theories that are central to the study are organizational communication, sense-making in organizations, push- and pull theory, hegemony, and also prior research about intranet. The outcomes of the study indicate that the intranet is used frequently - primarily to receive news and other information. But at the same time most users finds it difficult to search and find the information they need on the platform. The results shows that the intranet has to be tailored to take greater account of different group’s needs and interest, both in terms of their media habits and in terms of professional information needs.
Homecoming queen finalists Shirlie Vorous, Madeline Meltvedt, Margery Nobles, Emily Christie, and Betty Westerberg
No full textHomecoming queen nominations Shirlie Vorous, Madeline Meltvedt, Margery Nobles, Emily Christie, and Betty Westerberg, sit together in a living area
Experiences of Banner advertisement on a specialized homepage
No full textTitle: Experiences of Banner advertisement on a specialized homepage Author: Marcus Westerberg Supervisor: Marie Hemming Department: Department of Business Administration, IEM Course: Bachelor thesis in Business Administration, FEC 007 Purpose: Create a understanding for how the users on Internet pages experience the occurrence and the shape of the banners. Method: Methods used are quantitative and qualitative, and the facts and figures are based on a pop up inquiry and some telephoneinterviews. I elected pop up inquiry and telephoneinterview as my data collection. My inquiry had a high grade of standardization and the interviews had a low grade of standardization. Result: On the basis of the question of issue I have drawn the conclusion that the users feels that it is important with information in all advertising. It is also important for the users to create a value around the product. The users do not have the time to figure out the message behind advertising, the want simple and massive information about the product/service. It´s important for the users that the banneradvertising are about things that they are interested in. Only then the users will be drawn to the banneradvertising on different homepages.Titel: Upplevelser av bannerreklam på en nischad hemsida Författare: Marcus Westerberg Handledare: Marie Hemming Institution: Institutionen för ekonomi och management, IEM Kurs: Kandidatarbete i företagsekonomi, FEC 007 Syfte: Skapa en förståelse för hur användare på Internet upplever förekomsten och utformningen av bannerreklamen. Metod: Uppsatsen är baserad på en kvantitativ såväl som kvalitativ ansats där fakta har inhämtats med en pop up enkät och telefonintervjuer. För insamlingen av pop up enkäten använde jag mig av strukturerade frågor, där frågor och svarsalternativ redan hade bestämts på förhand. För insamlingen av telefonintervjuer använde jag mig av frågor med låg grad av standardisering. Slutsatser: Utifrån frågeställningen har jag kommit fram till att användarna upplever att det är viktigt med fakta och information i bannerreklamen. Det är viktigt för användarna att skapa ett värde kring produkten. Användarna har inte tid att tänka ut budskapet bakom reklamen, utan de vill ha enkel och mycket information om varan/tjänsten i reklamen. Det är viktigt för användarna att reklamen ska handla om det de är intresserade av. Det är då de dras till bannerreklamen på olika hemsidor
Non-extremal fractional branes
No full textWe construct non-extremal fractional D-brane solutions of type-II string theory at the Z_2 orbifold point of K3. These solutions generalize known extremal fractional-brane solutions and provide further insights into N=2 supersymmetric gauge theories and dual descriptions thereof. In particular, we find that for these solutions the horizon radius cannot exceed the non-extremal enhancon radius. As a consequence, we conclude that a system of non-extremal fractional branes cannot develop into a black brane. This conclusion is in agreement with known dual descriptions of the system.We construct non-extremal fractional D-brane solutions of type-II string theory at the Z_2 orbifold point of K3. These solutions generalize known extremal fractional-brane solutions and provide further insights into N=2 supersymmetric gauge theories and dual descriptions thereof. In particular, we find that for these solutions the horizon radius cannot exceed the non-extremal enhancon radius. As a consequence, we conclude that a system of non-extremal fractional branes cannot develop into a black brane. This conclusion is in agreement with known dual descriptions of the system.We construct non-extremal fractional D-brane solutions of type-II string theory at the Z_2 orbifold point of K3. These solutions generalize known extremal fractional-brane solutions and provide further insights into N=2 supersymmetric gauge theories and dual descriptions thereof. In particular, we find that for these solutions the horizon radius cannot exceed the non-extremal enhancon radius. As a consequence, we conclude that a system of non-extremal fractional branes cannot develop into a black brane. This conclusion is in agreement with known dual descriptions of the system.We construct non-extremal fractional D-brane solutions of type-II string theory at the Z_2 orbifold point of K3. These solutions generalize known extremal fractional-brane solutions and provide further insights into N=2 supersymmetric gauge theories and dual descriptions thereof. In particular, we find that for these solutions the horizon radius cannot exceed the non-extremal enhancon radius. As a consequence, we conclude that a system of non-extremal fractional branes cannot develop into a black brane. This conclusion is in agreement with known dual descriptions of the system.We construct non-extremal fractional D-brane solutions of type-II string theory at the Z 2 orbifold point of K3. These solutions generalize known extremal fractional-brane solutions and provide further insights into N =2 supersymmetric gauge theories and dual descriptions thereof. In particular, we find that for these solutions the horizon radius cannot exceed the non-extremal enhançon radius. As a consequence, we conclude that a system of non-extremal fractional branes cannot develop into a black brane. This conclusion is in agreement with known dual descriptions of the system
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