Building and Sustaining a Thriving Leadership Culture Essential to every healthy church is a biblical model of leadership. In the New Testament, church leadership is built around a team of elders ...working together, each bringing his own unique skills and gifts to the cause of shepherding the flock God entrusted to them. However, in many churches today the principle of plurality in leadership is often misunderstood, mistakenly applied, or completely ignored. Dave Harvey encourages church leaders to prioritize plurality for the surprising ways that it helps churches to flourish. This book not only builds a compelling case for churches to adopt and maintain biblical elder pluralities guided by solid leadership but also supplies practical tools to help elders work together for transformation.
Fuel cell electric vehicles are expanding quickly from light-duty to heavy-duty applications such as buses or trucks. Hydrogen fuel quality needs to comply with ISO14687:2019 to avoid any improper ...performance of the vehicles. Total sulphur is one of the most impactful contaminants to a fuel cell system and has a threshold of 4 nmol/mol. Most analytical methods provide a limit of detection (LOD) of 1 nmol/mol for total sulphur in hydrogen. Total sulphur is often not quantified and reported as below LOD due to lack of sensitivity. A new analytical method using cryo-focussing gas chromatography with sulphur chemiluminescence detector (cryo-GC-SCD) was developed for picomol/mol analysis of total sulphur. The method achieved linearity between 150–16,000 picomol/mol, validated against NPL reference materials, and relative expanded uncertainty of 21% (k = 2). Samples from 11 hydrogen refuelling stations (HRS) were analysed using this method. The total sulphur amount fraction for all the HRSs was more than 10 times lower than the actual ISO14687:2019 threshold with highest value around 290 picomol/mol. The study demonstrated that the cryo-GC-SCD method can measure total sulphur at picomol/mol in hydrogen fuel. Additionally, it provided the first results on sulphur compound stability in an aluminium gas cylinder for which further study is needed.
In mid-2019, the SuperCam instrument was installed aboard NASA's Mars 2020 rover, which is scheduled for launch in July 2020 and a landing at Jezero crater in February 2021. SuperCam is a ...collaboration between Los Alamos National Laboratory (LANL; the lead institution) and the Institut de Recherche en Astrophysique et Planétologie (IRAP), funded by the French Space Agency (CNES) and with contributions by universities and laboratories in France, Spain, and Denmark. SuperCam integrates a number of observation techniques into a single instrument, which builds on the design heritage of ChemCam, a laser induced breakdown spectroscopy (LIBS) instrument aboard the Curiosity rover. While retaining ChemCam's LIBS mode, SuperCam adds a remote Raman spectroscopy mode, an infrared spectrometer (IR), a microphone, and improves upon ChemCam's greyscale context imager with a color imager. This paper will give a broad overview of the SuperCam instrument, which is divided into three portions: the LANL-built SuperCam Body Unit (SCBU), the French-built SuperCam Mast Unit (SCMU), and the Spanish-built SuperCam Calibration Target (SCCT). The instrument operational modes will be detailed, explaining how the instrument as a whole is used to collect and process its data within the context of the Mars 2020 rover. Next, we will detail LANL's design, integration, and testing of the SCBU. The SCBU is installed inside the rover's body and features an optical demultiplexer feeding a set of three spectrometers, which are digitized by three charge-coupled devices (CCDs) from e2v, controlled by a low-noise spectrometer electronics module. The longest-wavelength visible-range spectrometer employs high-throughput transmission optics and an image intensifier to amplify and electronically gate the incoming light in Raman mode. This transmission spectrometer is powered and controlled by a high voltage power supply, designed and built at LANL. A low voltage power supply converts rover power to voltages used by the instrument. The command and data handling (C&DH) module features a Leon-3-based processor and a field programmable gate array for custom logic, along with a memory array. Instrument flight software architecture will be presented, with a focus on the body unit and mast unit functionality divide. The test qualification scheme will be detailed, with information on instrument optical performance testing.
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