Universal Short-Circuit and Open-Circuit Fault Detection for an Inverter

Short-circuit and open-circuit faults of an inverter’s power device often lead to catastrophic failure of the entire system if not detected and acted upon within a few microseconds, particularly for emerging wide bandgap (WGB) power semiconductors. While a significant amount of research has been done on the fast and accurate protection and detection of short-circuit faults, there has been less success corresponding to the research on open-circuit faults. Common downfalls include protection and detection that are too application-specific, take longer than a couple of microseconds, and are not cost-efficient. This study proposes a new open-circuit fault protection and detection system integrated with a pre-existing short-circuit system called desaturation protection. First, a literature review is conducted to confirm the necessity of the new protection and detection scheme. Second, the operation principle of the newly proposed protection and detection circuitry is discussed, and design considerations are given. Third, a comprehensive case study revolving around implementing the new protection and detection system is conducted using Synopsys/Saber simulation software. Fourth, an experiment is devised and constructed to showcase the protection and detection scheme’s success, effectiveness, and adaptability in a real-world environment. Fifth, concluding remarks are given, summarizing all the work presented in this study. The results of testing the proposed system illustrate the success and reliability of the new fault protection and detection system

Creatore

https://digitalcommons.library.umaine.edu/mmb-vp/5580/thumbnail.jp

Combinatorial stress responses: direct coupling of two major stress responses in Escherichia coli

Nitrogen is an essential element for all life, and this is no different for the bacterial cell. Numerous cellular macromolecules contain nitrogen, including proteins, nucleic acids and cell wall components. In Escherichia coli and related bacteria, the nitrogen stress (Ntr) response allows cells to rapidly sense and adapt to nitrogen limitation by scavenging for alternative nitrogen sources through the transcriptional activation of transport systems and catabolic and biosynthetic operons by the global transcriptional regulator NtrC. Nitrogen-starved bacterial cells also synthesize the (p)ppGpp effector molecules of a second global bacterial stress response - the stringent response. Recently, we showed that the transcription of relA, the gene which encodes the major (p)ppGpp synthetase in E. coli, is activated by NtrC during nitrogen starvation. Our results revealed that in E. coli and related bacteria, NtrC functions in combinatorial stress and serves to couple two major stress responses, the Ntr response and stringent response

If You Talk in Your Sleep Don\u27t Mention My Name

VERSE 1A young married lady who was very much inclinedTo be just a little indiscreet,Once met a fellow,They were never introducedBut they met as lots of other people meet.They both were having luncheon in a private dining room,The meal was great and every thing was grand.When suddenly he saw a wedding ring on her fingerAs he held her dainty little hand.The door was closed no one could hear,So he leaned on the table and he said my dear. CHORUSI can see that you are marriedAnd you know I’m married, too!And nobody knows that you know me and nobody knows that I know you and,If you care to, we’ll have luncheonEv’ry day here just the same,But sweet heartIf you talk in your sleepDon’t mention my name.I can name. VERSE 2The young married lady didn’t mean a bit of harm,But she did go to luncheon ev’ry day.She used to think it funny,And if hubby ever knew,She often used to wonder what he’d say?One night she was awakened by a most familiar voice,The voice was right beside her, it would seem;For a minute she was puzzled then it dawned upon her mindThat her hubby must be talking in his dream.She sat up straight with an awful start,For she knew every word that he said by heart. CHORU

Automatic Compensation of an Electro-Acoustic System

Electrical Engineerin

Sequential Solutions in Nonlinear Control Theory

Electrical Engineerin

alpha-nucleus potentials for the neutron-deficient p nuclei

alpha-nucleus potentials are one important ingredient for the understanding of the nucleosynthesis of heavy neutron-deficient p nuclei in the astrophysical gamma-process where these p nuclei are produced by a series of (gamma,n), (gamma,p), and (gamma,alpha) reactions. I present an improved alpha-nucleus potential at the astrophysically relevant sub-Coulomb energies which is derived from the analysis of alpha decay data and from a previously established systematic behavior of double-folding potentials.Comment: 6 pages, 3 figures, accepted for publication in Phys. Rev.

From Chiral Lagrangians to Landau Fermi Liquid Theory of Nuclear Matter

A simple relation between the effective parameters of chiral Lagrangians in medium as predicted by BR scaling and Landau Fermi liquid parameters is derived. This provides a link between an effective theory of QCD at mean-field level and many-body theory of nuclear matter. It connects in particular the scaling vector-meson mass probed by dileptons produced in heavy-ion collisions (e.g., CERES of CERN-SPS) to the scaling nucleon-mass relevant for low-energy spectroscopic properties, e.g., the nuclear gyromagnetic ratios $\delta g_l$ and the effective axial-vector constant $g_A^\star$.Comment: 17 pages, 6 Postscript figures, uses article.sty, epsfig.st

Electromagnetic Form Factors of Charged and Neutral Kaons

The charged and neutral kaon form factors are calculated as a phenomenological application of the QCD Dyson-Schwinger equations. The results are compared with the pion form factor calculated in the same framework and yield \mbox{$F_{K^\pm}(Q^2) > F_{\pi^\pm}(Q^2)$} on \mbox{$Q^2\in[0,3]$~GeV$^2$}; and a neutral kaon form factor that is similar in form and magnitude to the neutron charge form factor. These results are sensitive to the difference between the kaon and pion Bethe-Salpeter amplitude and the $u$- and $s$-quark propagation characteristics.Comment: 11 Pages, 2 figures, REVTEX, uses epsfig. No chang

Improved Teamwork and Implementation of Clinical Pathways in a Congenital Heart Surgery Program

Introduction: Complex surgical populations are at increased risk of morbidity, especially when experiencing variations in care and poor teamwork. The goal of this project was to improve teamwork and decrease variations in care in a pediatric congenital heart surgery population by implementing Integrated Clinical Pathways (ICPs) on a foundation of teamwork training. Methods: A core team used project management for completion of the project and measurement of success. The leadership team created a new operations infrastructure for the program to effectively implement and sustain improvement. Master trainers targeting teams caring for the patient population completed teamwork training and coaching. ICPs were designed and implemented using iterative tests of change with the assistance of an expert panel. Results: Three of the 4 units experienced a significant improvement in teamwork after training and coaching. The area without a significant change was one with high-level teamwork training already in place. ICPs were implemented in 2 patient subpopulations. We detected a decrease in total hours intubated using statistical process control charts in both of the ICP patient populations. Despite a decrease in intubation hours, we did not detect a reduction in length of stay in days. The infrastructure for the program was successfully implemented and remains in place 6 years later. Conclusions: Teamwork can be improved with an efficiently delivered training and coaching program. On a foundation of teamwork, ICPs can be implemented and sustained if a supporting infrastructure is in place including program leadership, buy-in from all teams, project management, and ongoing measurement