Long fluid filled bags suspended by line forces

A previous analysis of fluid filled storage bags is extended to the case of a long fluid filled cylindrical membrane supported by uniform line loads. Cross-sectional shape, stiffness of the support system and stress resultants in the membrane are determined. The application of the numerical results to problems arising in the design of nonrigid airships is discussed

A system using solid ceramic oxygen electrolyte cells to measure oxygen fugacities in gas-mixing systems

Details are given for the construction and operation of a 101.3 kN/sq m (1 atmosphere) redox control system. A solid ceramic oxygen electrolyte cell is used to monitor the oxygen fugacity in the furnace. The system consists of a vertical quench, gas mixing furnace with heads designed for mounting the electrolyte cell and with facilities for inserting and removing the samples. The system also contains the high input impedance electronics necessary for measurements, a simplified version of a gas mixing apparatus, and devices for experiments under controlled rates of change relative to temperature and redox state. The calibration and maintenance of the system are discussed

Insights from the rat genome sequence

The availability of the rat genome sequence, and detailed three-way comparison of the rat, mouse and human genomes, is revealing a great deal about mammalian genome evolution. Together with recent developments in cloning technologies, this heralds an important phase in rat research

A high-input impedance differential millivolt meter for use with solid ceramic oxygen electrolyte cells

Design factors are given for a high-input impedance differential millivolt meter designed, built, and tested as an inexpensive solid-state electronic system for use in measuring the electromotive force from solid ceramic oxygen electrolyte cells. A schematic diagram is included

A plan for spacecraft automated rendezvous

An automated rendezvous approach has been developed that utilizes advances in technology to reduce real-time/near real-time flight operations support personnel to an acceptable level that is near the minimum without jeopardizing the success of the mission. The on-board flight targeting uses a rule-based system to select the pursuit vehicle phasing orbits and uses precise navigation updates from the pursuit/target spacecraft made possible by the global positioning system receivers/processors on both spacecraft to adjust the phasing orbits and achieve rendezvous. The ascent-to-orbit targeting for the pursuit vehicle has been successfully decoupled from the on-orbit orbit transfer phasing targeting. Typical launch window data have been developed for the heavy lift launch vehicle and cargo transfer vehicle for a Space Station Freedom rendezvous mission

The counter-conventional mindsets of entrepreneurs

These days, it seems, nearly everyone aspires to be an entrepreneur. But many entrepreneurs think and act differently than the ways in which most other businesspeople do and the ways much of today’s business education encourages them to think and act. My in-depth examination of dozens of entrepreneurs I’ve come to know well over the past two decades tells me that their unconventional – or, dare I say, counter-conventional – mindsets and behaviors are marked by six common patterns: “Yes, we can”; Beg, borrow, or steal; Think narrow, not broad; Problem-first, not product-first logic; “No” is something waiting to be turned into “Yes”; Ask for the cash and ride the float. Thankfully, we now know that entrepreneurs are made, not born. These six patterns of entrepreneurial thought and action are eminently learnable. If you want to someday be an entrepreneur, or if you want the people in your company to become “more entrepreneurial”, developing – or encouraging and incentivizing your people to develop – such a mindset might constitute a suitable first step toward preparing you to follow a more entrepreneurial path or to foster a more entrepreneurial culture in your company

Unsupervised Time Series Extraction from Controller Area Network Payloads

This paper introduces a method for unsupervised tokenization of Controller Area Network (CAN) data payloads using bit level transition analysis and a greedy grouping strategy. The primary goal of this proposal is to extract individual time series which have been concatenated together before transmission onto a vehicle's CAN bus. This process is necessary because the documentation for how to properly extract data from a network may not always be available; passenger vehicle CAN configurations are protected as trade secrets. At least one major manufacturer has also been found to deliberately misconfigure their documented extraction methods. Thus, this proposal serves as a critical enabler for robust third-party security auditing and intrusion detection systems which do not rely on manufacturers sharing confidential information.Comment: 2018 IEEE 88th Vehicular Technology Conference (VTC2018-Fall

Book Review: James Duane, You Have the Right to Remain Innocent: What Police Officers Tell Their Children About the Fifth Amendment

In this essay, the student author reviews the book You Have the Right to Remain Innocent by James Duane, which emphasizes the inherent risks of speaking to the police, regardless of whether or not you have something to hide