On the structure and spectrum of classical two-dimensional clusters with a logarithmic interaction potential

We present a numerical study of the effect of the repulsive logarithmic inter-particle interaction on the ground state configuration and the frequency spectrum of a confined classical two-dimensional cluster containing a finite number of particles. In the case of a hard wall confinement all particles form one ring situated at the boundary of the potential. For a general r^n confinement potential, also inner rings can form and we find that all frequencies lie below the frequency of a particular mode, namely the breathing-like mode. An interesting situation arises for the parabolic confined system(i.e. n=2). In this case the frequency of the breathing mode is independent of the number of particles leading to an upper bound for all frequencies. All results can be understood from Earnshaw's theorem in two dimensions. In order to check the sensitivity of these results, the spectrum of vortices in a type II superconductor which, in the limit of large penetration depths, interact through a logarithmic potential, is investigated.Comment: 11 pages, 6 figure

Enhancing Faculty Competency in Lean Thinking Bodies of Knowledge

The Lean Aerospace Initiative’s (LAI) Educational Network (EdNet) established in 2002 is comprised of 32 universities who share a common interest to collaborate on developing and deploying curriculum for teaching lean six sigma fundamentals. Supported by a small staff centered at MIT, collaborating faculty have developed a week-long LAI Lean Academy® course, and delivered it to multiple audiences on-campus and in industry and government. The topics of the course map to many CDIO syllabus topics, and the pedagogy and assessment methods have borrowed on the CDIO knowledge base. This paper reports on this undertaking and on the extent to which it has contributed to developing faculty competency for teaching Lean Thinking in engineering and management. Results from this study reveal that instructors have significantly improved their competency to teach Lean Thinking during their affiliation with the LAI EdNet. On average, the instructors’ proficiency in twelve Lean Enterprise knowledge areas has increased a full level, from 3.2 to 4.2, on the CDIO Syllabus MIT Activity Based Proficiency Scale. The instructors report that collaboration on conceiving, developing and implementing the curriculum has been the most valuable EdNet activity for increasing their competency

Active Learning Strategies for Teaching Lean Thinking

Active learning is a method of designing instruction so that classroom students are actively involved in learning concepts and content. Instead of casting students into the role of passive listener, active learning techniques strive to engage learners in reading, writing, discussing and doing things to connect the learners to the material. The Lean Aerospace Initiative sponsored the development of a foundational LAI Lean Academy® course about lean concepts. The class is targeted for an audience with little or no experience in lean concepts and it was designed with a learner-centered focus using active learning techniques. Several strategies used successfully in this class will be described in this paper, specifically: plant tours, the supply chain puzzle, mechanical assembly for lean engineering and interviews/out briefs. Results from student feedback indicate that class participants enjoy the active learning segments of the class much better than modules that are mostly lecture-based

Active Learning Strategies for Teaching Lean Thinking

Active learning is a method of designing instruction so that classroom students are actively involved in learning concepts and content. Instead of casting students into the role of passive listener, active learning techniques strive to engage learners in reading, writing, discussing and doing things to connect the learners to the material. The Lean Aerospace Initiative sponsored the development of a foundational LAI Lean Academy® course about lean concepts. The class is targeted for an audience with little or no experience in lean concepts and it was designed with a learner-centered focus using active learning techniques. Several strategies used successfully in this class will be described in this paper, specifically: plant tours, the supply chain puzzle, mechanical assembly for lean engineering and interviews/out briefs. Results from student feedback indicate that class participants enjoy the active learning segments of the class much better than modules that are mostly lecture-based

Relationship between chemical composition and nematicidal activity of different essential oils

In this study, the relationship between nematicidal activity and chemical composition of ten essential oils (EOs) from different plant species was investigated both in in vitro assays on juveniles (J2) and eggs of the root-knot nematode Meloidogyne incognita and in experiments on tomato in soil infested by M. incognita. Nematode J2 were exposed for 4, 8 or 24 h to 0.78–100 µg mL−1 concentrations of each EO, whereas 24, 48 or 96 h exposures to 250, 500 and 1000 µg mL−1 solutions were tested on M. incognita egg masses. Treatments with 50, 100 or 200 µg kg soil rates of each EO were applied in the experiment on potted tomato. The highest nematicidal potential resulted for the C. verum EO, as highly toxic to both M. incognita J2 and eggs and strongly suppressive on nematode multiplication on tomato roots. The infestation of M. incognita on tomato roots was also strongly reduced by the EOs from E. citriodora and S. aromaticum, both highly toxic to M. incognita J2 but less active on nematode eggs. Adversely, R. graveolens EO strongly inhibited the egg hatch but was limitedly toxic to the infective J2. Chemical composition of the EOs was determined by GC-FID and GC-MS. The ten EOs showed a very different chemical composition in terms of major phytochemicals, with one or two dominant components totally amounting up to 85%. The structure–activity relationship based on the main phytochemicals identified in the assayed EOs and their nematicidal effects on M. incognita was also discussed. Results from this study confirmed that the selection of suitable EO raw materials can lead to the formulation on new effective nematicidal products

Efficiency of water use and nitrogen for goat milk production in irrigated pasture to different management.

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Clinical inertia is the enemy of therapeutic success in the management of diabetes and its complications: A narrative literature review

Diabetes mellitus is a chronic disease characterized by high social, economic and health burden, mostly due to the high incidence and morbidity of diabetes complications. Numerous studies have shown that optimizing metabolic control may reduce the risk of micro and macrovascular complications related to the disease, and the algorithms suggest that an appropriate and timely step of care intensification should be proposed after 3 months from the failure to achieve metabolic goals. Nonetheless, many population studies show that glycemic control in diabetic patients is often inadequate. The phenomenon of clinical inertia in diabetology, defined as the failure to start a therapy or its intensification/de-intensification when appropriate, has been studied for almost 20 years, and it is not limited to diabetes care, but also affects other specialties. In the present manuscript, we have documented the issue of inertia in its complexity, assessing its dimensions, its epidemiological weight, and its burden over the effectiveness of care. Our main goal is the identification of the causes of clinical inertia in diabetology, and the quantification of its social and health-related consequences through the adoption of appropriate indicators, in an effort to advance possible solutions and proposals to fight and possibly overcome clinical inertia, thus improving health outcomes and quality of care