Modular connector

Résumé

A modular connector is a type of electrical connector for cords and cables of electronic devices and appliances, such as in computer networking, telecommunication equipment, and audio headsets. Modular connectors were originally developed for use on specific Bell System telephone sets in the 1960s, and similar types found use for simple interconnection of customer-provided telephone subscriber premises equipment to the telephone network. The Federal Communications Commission (FCC) mandated in 1976 an interface registration system, in which they became known as registered jacks. The convenience of prior existence for designers and ease of use led to a proliferation of modular connectors for many other applications. Many applications that originally used bulkier, more expensive connectors have converted to modular connectors. Probably the best-known applications of modular connectors are for telephone and Ethernet. Accordingly, various electronic interface specifications exist for a

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https://en.wikipedia.org/wiki/Modular_connector

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Development of a microfluidic interface for suspended microchannel resonators

Damien Maillard

Suspended microchannel resonators (SMRs) are devices that detect particles in liquid samples. In comparison with similar resonating devices that must be immersed, SMRs allow the fluids to flow through microfluidic resonators. This principle of operation leads to a great reduction of the required sample and to enhanced quality factors. As such, SMRs show great potential for a variety of sensing applications. This thesis reports on the final steps of the microfabrication of SMRs and on the development of a microfluidic interface allowing the assembly and operation of those devices. The interface connector was drawn in SolidWorks before being fabricated. Two different techniques were then used. 3D-printing allowed for rapid prototyping of the connector, and different versions were produced. The final device was machined out of PMMA by the mechanical workshop. Sealing techniques were studied for vacuum operation of the SMRs. After reviewing a few different methods, we adopted an o-ring-based solution. In a similar manner, we selected fluidic connections that best suited the interface. Simulations were conducted to ensure the viability of our solution. In particular, the deformation of silicon nitride microchannel ceilings under o-ring compression was studied. Few experiments were performed with a 3D-printed connector, assembled to a simple PMMA lid and to an actual SMRs chip previously fabricated. It allowed us to evaluate the performances of 3D-printed devices and gain important insights in the assembly and handling of the fluid delivery system. Although the PMMA connector was not tested, it is expected to work admirably, as it possesses numerous advantages over its 3D-printed counterpart.

2016

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We report on the design and operation of a world-to-chip microfluidic interface and experimental setup for fluidic micro- and nano-electromechanical systems. The central component of the interface is an engineered polyether ether ketone connector that brings fluid samples from a commercial syringe pump to the chip with the help of o-rings. In addition to that, the connector serves as an on-chip vacuum chamber. To confirm the adequate operation of our interface, we use complex microfluidic devices that were previously fabricated, suspended microchannel resonators, and demonstrate a fast exchange between fluids (on the scale of 130 s from isopropyl alcohol to water), in-vacuum operation of the devices (intrinsic damping regime), and accurate temperature control of the chip at different set points.

AMER INST PHYSICS2019

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A Dialogue-based Grounding mechanism and new Service Description Features for adapting Semantic (Web) Services to Personal Assistants

David Portabella Clotet, Martin Rajman

We delegate increasingly sophisticated and complex tasks to computer programs, and we require them to act autonomously on our behalf in distributed environments (eg the web, the grid). Personal Assistants (PA) are computer programs that can be thought as a very natural metaphor for such systems. Semantic Web Services are self-contained, modular applications that can be semantically described and published over the Web by service providers. This makes it possible for a PA to look for a particular type of service in a directory and invoke it on the fly. However, current service description languages such as OWL-S do not help much the PA to determine the correct input arguments in order to invoke the service and so user intervention is required. We are aimed at minimizing the necessary user intervention by adding new service description features and the use of a dialogue-based grounding mechanism that can be exploited by the procedural semantics capabilities of the provider and the reasoning capabilities of the PA. As a validation we use the proposed approach in an e-service example to compute an insurance premium based on the requirements of the user.

Swiss Federal Institute of Technology (EPFL)2004

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