The noise level on CV90 has always been a big problem, loud noise and great vibrations have been a part of everyday work for the crew. BAE-systems are the developerOf CV90 have started a work with the goal to lower the noise and vibrations in the vehicle. Tests have been made witch shows that the biggest source of the problem is the track. A new track has been constructed, in rubber instead of the traditional steel track. Tests witch have been made on the rubber track shows that nest source of vibrations and noise is the engine and transmission suspension, today the transmission is mutely mounted on the body.The new suspension has been modified from the present, but it has been made bigger so a rubber damper can be fitted between the transmission and the holder. When the rubber damps 1cm it will absorb the force of 2.5G, meanwhile it must hold the force of 5G in every direction. The forces have been simulated by FEM-analysis.A new construction have been made witch fore fill the demands on forces. The natural frequency on the rubber has been calculated to 9.83 Hz, which is around 3 times less the frequency on the engine when the engine is idling(33.33Hz). The idling frequency on the engine is the lowest frequency that will affect the dampers. The transmission will have full damping effect on idling, when the speed raises will the track be the biggest source of vibrations and noise. But on idle this problem will be considerably lowered.
Abstract The modular nature of the BIPI ligands allows for systematic optimization of each ligand region. The development of ligands optimized for asymmetric hydrogenation of the challenging unfunctionalized olefin substrate class is described. The naphthyl peri position, C‐8, has been identified as a critical stereocontrol element in the design of these ligands. Highly enantioselective ligands suitable for hydrogenation of tri‐ and tetrasubstituted olefins are detailed.
The Terrestrial Digital Video Broadcasting system (DVB-T) can be utilized as a supplemental broadband downlink to today´s cellular systems. Thus, mobile Internet access with downstream peek bit rates of 10 to 30 Mbit/s can be achieved. To make this concept competitive in comparison to for example UMTS, efficient Radio Resource Management (RRM) is essential. Schemes for downlink dynamic RRM on a packet-by-packet basis are suggested and evaluated for a simplified packet data model. Packet and Resource Plan Scheduling (PARPS) schemes reduce the problem of finding an optimized combination of several RRM parameters to a scheduling problem. Dynamic Single Frequency Networks (DSFN) and Virtual Cellular Networks (VCN) exploits the macro-diversity capability of the OFDM modulation scheme by dynamically forming groups of transmitters that send the same information on the same frequency channel simultaneously. Dynamic Packet Assignment (DPA) is a combination of Dynamic Channel Assignment (DCA) and packet scheduling. The Fairly Shared Spectrum Efficiency (FSSE), in bit/s/Hz/transmitter site, is improved by up to 370% for a certain test cases, by the DSFN scheme in comparison to DPA.
I denna rapport redovisas resultaten av en omfattande intervjuundersokning av svenska fortidspensionarer och deras levnadsvillkor som de sag ut ar 2000. Undersokningen ingick som den svenska delen ...
Purpose The purpose is to firstly, provide an example of how voices of people with various disabilities (motor, visual, hearing, and neuropsychiatric impairments) can be listened to and involved in the initial phases of a co-design process (Discover, Define). Secondly, to present the outcome of the joint explorations as design opportunities pointing out directions for future development of crisis communication technologies supporting people with disabilities in building crisis preparedness. The study was conducted during the Covid-19 pandemic. Design/methodology/approach The study assumes a design research approach including a literature review, focus group interviews, a national online survey and collaborative (co-)design workshops involving crisis communicators and representatives of disability organisations in Sweden. The research- and design process was organised in line with the Double Diamond design process model consisting of the four phases: Discover, Define, Develop and Deliver, whereof the two first phases are addressed in this paper. Findings The analysis of the survey data resulted in a series of challenges, which were presented to and evaluated by crisis communicators and representatives from the disability organisations at the workshops. Seven crisis communication challenges were identified, for example, the lack of understanding and knowledge of needs, conditions and what it means to build crisis preparedness for people with disabilities, the lack of and/or inability to develop digital competencies and the lack of social crisis preparedness. The challenges were translated into design opportunities to be used in the next step of the co-design process (Develop, Deliver). Originality/value This research paper offers both a conceptual approach and empirical perspectives of design opportunities in crisis communication. To translate identified challenges into design opportunities starting with a “How Might We”, creates conditions for both researchers, designers and people with disabilities to jointly turn something complex, such as a crisis communication challenge, into something concrete to act upon. That is, their joint explorations do not stop by “knowing”, but also enable them to in the next step take action by developing potential solutions for crisis communication technologies for facing these challenges.
Two approaches to BIRT-377 (1) are discussed. The focus is the stereoselective synthesis of trans-imidazolidinones such as 16 and cis-oxazolidinones such as 29d. The kinetic and thermodynamic factors governing the cis/trans selectivity in the formation of 16 and 29d were studied, and it was found that neither can assure complete selectivity in favor of either form. It was then found in both cases that a crystallization-driven dynamic transformation can produce, in a very efficient manner, the desired cis isomer in virtually 100% selectivity in the case of 29d, whereas only the trans isomer is obtained in the case of 16. Self-regeneration of stereocenters is then applied to the alkylation of the enolates derived from 16 and 29d with p-bromobenzyl bromide, followed by routine transformations, to produce 1 in >99.9% ee via two separate processes.
How do we teach creative writing? How do we examine literary creation? Howcan we theorize the relationship between creative writing and the literarycanon? How can we make the distinction between wo ...
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