Lubricant degradation, transport and the effect of extended oil drain intervals on piston assembly tribology

There are ever increasing demands on lubricant manufacturers to meet governmental legislation and customer needs by improving fuel economy, engine durability and exhaust system compatibility as shown by the introduction of GF4 and move towards GF5 specification oils. This has created an ever increasing need to understand how oil degrades in an engine and how this degraded oil affects piston assembly tribology. This review conference paper will give an overview of a collaborative project that has been undertaken to further enhance the understanding of how lubricant degrades in an operating engine, its transport through the engine and effect upon piston assembly tribology

Connectionist Temporal Modeling for Weakly Supervised Action Labeling

We propose a weakly-supervised framework for action labeling in video, where only the order of occurring actions is required during training time. The key challenge is that the per-frame alignments between the input (video) and label (action) sequences are unknown during training. We address this by introducing the Extended Connectionist Temporal Classification (ECTC) framework to efficiently evaluate all possible alignments via dynamic programming and explicitly enforce their consistency with frame-to-frame visual similarities. This protects the model from distractions of visually inconsistent or degenerated alignments without the need of temporal supervision. We further extend our framework to the semi-supervised case when a few frames are sparsely annotated in a video. With less than 1% of labeled frames per video, our method is able to outperform existing semi-supervised approaches and achieve comparable performance to that of fully supervised approaches.Comment: To appear in ECCV 201

Extraction and tribological investigation of top piston ring zone oil from a gasoline engine

With tightening emission regulations, increased expected fuel economy, and longer drain intervals impacting on lubricant formulation, greater understanding of how oil degrades in an automotive engine is becoming ever more important. Equally significant is the effect that this degraded lubricant has on the tribological operation of the engine, particularly its overall internal friction and component wear. In a previous paper, four tests to degrade oil in a single cylinder engine were reported [1]. These tests were set up such that the lubricating oil was degraded in the ring pack before returning to the sump, where it was sampled and chemical and rheological analysis undertaken. This paper reports the extension of this work using the same Hydra engine and describes how oil has additionally been extracted from the rear of the top piston ring during engine operation. This extracted oil has then been subjected to similar analysis as the sump oil samples in the previous tests, along with additional analysis to look at the tribological properties of the oil using tribometers. The results clearly show significant differences in the rheological, tribological, and chemical properties of the fresh oil and used sump oil samples when compared with the top ring zone (TRZ) oil samples, particularly the effect of load on the levels of volatiles present in the TRZ samples and their effect on traction and friction coefficient values during tribological testing

Preparing students for service-learning and social entrepreneurship experiences

[EN] A critical feature of contemporary models of civic engagement is mutually-beneficial collaboration between campus and community partners, in which all members contribute skills and experience to co-create knowledge. At any given time, multiple relationships require attention – for example, triadic relationships between students, faculty, and staff of community organizations. This model is relevant for both service-learning (SL) and social entrepreneurship (SE), as both seek to work with community partners or in the community to address challenges facing the community. To date, research involving students has focused on the impact of these learning opportunities on student development (e.g., academics, civic participation). For students to be true partners in SL and SE projects, however, we need to understand the reciprocity of these interactions, particularly how to prepare students can become collaborators in developing campus-community partnerships (i.e., participatory readiness). To promote participatory readiness among students, we argue for a competency-based framework that integrates research and recommendations from the fields of service-learning, social entrepreneurship, and educational leadership. Throughout the article, we discuss similarities and differences in SL and SE practices and draw attention to the implications of the work for community engagement and pedagogy in higher education.http://ocs.editorial.upv.es/index.php/HEAD/HEAD18Chung, H.; Taylor, K.; Nehila, C. (2018). Preparing students for service-learning and social entrepreneurship experiences. Editorial Universitat Politècnica de València. 1169-1177. https://doi.org/10.4995/HEAD18.2018.8171OCS1169117

Development of a Car-like Online Navigation Testbed

We present new realtime path planning and collision avoidance algorithms for an autonomous rover equipped with a laser range finder to be used as a platform for multi-agent navigation and control in unknown environments. For successful navigation, such tasks as localization, map-building, and collision avoidance should be handled at the vehicle level. The proposed architecture covers these aspects of robotic path- planning in a modular and robust manner, allowing quicker development of more sophisticated path-planners. Using a conventional SLAM algorithm, a feature map and the location of the vehicle is obtained. The information for orientation and distance of the obstacles ahead is available from a laser range finder. The proposed collision avoidance algorithm provides multiple paths to guide the vehicle through the environment. The system acts as a self-contained extendable platform for development and testing of high-level pathfinders

Franchising And The Internet: An Example of Knowledge Mangement in New Zealand Business

“The newest innovations, which we label information technologies, have begun to alter the manner in which we do business and create value, often in ways not readily foreseeable even five years ago.” [1]. The Internet is a technology that has revolutionised business and the manner in which it is conducted. Recent studies suggest that e-commerce will explode to over US$6 trillion in 2 years time. This paper discusses how the Internet can be used in one particular facet of business: franchising. The manner in which services are provided through the use of Internet sites and the strategies by which these can be implemented are covered, examining the different types of sites, and the roles of the franchisor and franchisee in development. The benefits that can be experienced are outlined, and vary from advertising both the franchise concept and the products or services provided, improving communication between parties, and providing the opportunity for collaborative ventures. Up until now the degree to which the Internet has been adopted by Franchises in New Zealand has been limited, with some notable exceptions. However recent surveys reveal that its acceptance is increasing, and that franchise systems recognise that the use of technology poses opportunities in the years to come

Engaging Formational Stories and Pastoral Emagination

This essay explores the potential of equipping Supervisor-Mentors for mentoring through the use of their own formational stories.  Storytelling cues are provided by Auburn Seminary's Learning Pastoral Imagination study.  Desired Outcomes would include the judicious use of one's formation stories in mentoring relationships, but also to be alert to their student’s unfolding formational stories so that they might reflect fruitfully on these.

A 2.5-GHz asymmetric multilevel outphasing power amplifier in 65-nm CMOS

We present a high-efficiency transmitter based on asymmetric multilevel outphasing (AMO). AMO transmitters improve their efficiency over LINC (linear amplification using nonlinear components) transmitters by switching the output envelopes of the power amplifiers among a discrete set of levels. This minimizes the occurrence of large outphasing angles, reducing the energy lost in the power combiner. We demonstrate this concept with a 2.5-GHz, 20-dBm peak output power transmitter using 2-level AMO designed in a 65-nm CMOS process. To the authors' knowledge, this IC is the first integrated implementation of the AMO concept. At peak output power, the measured power-added efficiency is 27.8%. For a 16-QAM signal with 6.1dB peak-to-average power ratio, the AMO prototype improves the average efficiency from 4.7% to 10.0% compared to the standard LINC system