Analysis and Identification of Subsynchronous Vibration for a High Pressure Parallel Flow Centrifugal Compressor

The evaluation of turbomachinery designs prior to actual hardware test and field installation is now the rule rather than the exception for rotating machinery manufacturers. This requires the verification of the current state of the art analytical techniques for rotor-bearing-seal dynamics by development testing and/or controlled test stand or field vibration studies. This paper presents the summary of a complete analytical design evaluation of an existing parallel flow compressor and reviews a recent field vibration problem that manifested itself as a subsynchronous vibration that tracked at approximately 2/3 of compressor speed. The comparison of predicted and observed peak response speeds, frequency spectrum content, and the performance of the bearing-seal systems are presented as the events of the field problem are reviewed. Conclusions and recommendations are made based upon the results of this design review.

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Food Analysis: Present, Future, and Foodomics

ISRN Analytical Chemistry ◽

10.5402/2012/801607 ◽

2012 ◽

Vol 2012 ◽

pp. 1-16 ◽

Cited By ~ 46

Author(s):

Alejandro Cifuentes

Keyword(s):

Food Analysis ◽

Historical Perspective ◽

State Of The Art ◽

Analytical Techniques ◽

Science Research ◽

Food Science ◽

Analytical Instruments ◽

Current State ◽

Future Challenges ◽

Modern Analytical

This paper presents a revision on the instrumental analytical techniques and methods used in food analysis together with their main applications in food science research. The present paper includes a brief historical perspective on food analysis, together with a deep revision on the current state of the art of modern analytical instruments, methodologies, and applications in food analysis with a special emphasis on the works published on this topic in the last three years (2009–2011). The article also discusses the present and future challenges in food analysis, the application of “omics” in food analysis (including epigenomics, genomics, transcriptomics, proteomics, and metabolomics), and provides an overview on the new discipline of Foodomics.

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Workshop report: clinical CASA--the quest for consensus

Reproduction Fertility and Development ◽

10.1071/rd9950951 ◽

1995 ◽

Vol 7 (4) ◽

pp. 951 ◽

Cited By ~ 37

Author(s):

D Mortimer ◽

RJ Aitken ◽

ST Mortimer ◽

AA Pacey

Keyword(s):

Sperm Morphology ◽

State Of The Art ◽

Semen Analysis ◽

Analytical Techniques ◽

Human Sperm ◽

Diagnostic Value ◽

Clinical Use ◽

Workshop Report ◽

Sperm Analysis ◽

Current State

The goals of the Workshop were to establish the current state-of-the-art in the clinical use of computer-aided sperm analysis (CASA), to identify areas of contention or confusion in the use of CASA technology, and to reach consensus on these matters to facilitate the wider use, and usefulness, of these instruments in clinical and research applications. CASA assessments of sperm morphology were not considered as they were discussed in a separate Workshop (Advanced Techniques in Sperm Preparation and Imaging) on analytical techniques. Four topics were considered: (a) CASA and semen analysis; (b) the diagnostic value of sperm kinematics in semen; (c) human sperm hyperactivation; and (d) CASA and fertility prediction. In all, 17 specific consensus points were identified.

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Analysis of Nucleosides and Nucleotides in Plants: An Update on Sample Preparation and LC–MS Techniques

Cells ◽

10.3390/cells10030689 ◽

2021 ◽

Vol 10 (3) ◽

pp. 689

Author(s):

Henryk Straube ◽

Claus-Peter Witte ◽

Marco Herde

Keyword(s):

Mass Spectrometry ◽

Liquid Chromatography ◽

State Of The Art ◽

Solid Phase ◽

Analytical Techniques ◽

Phase Extraction ◽

Future Developments ◽

Current State ◽

Depth Analysis ◽

Nucleotides And Nucleosides

Nucleotides fulfill many essential functions in plants. Compared to non-plant systems, these hydrophilic metabolites have not been adequately investigated in plants, especially the less abundant nucleotide species such as deoxyribonucleotides and modified or damaged nucleotides. Until recently, this was mainly due to a lack of adequate methods for in-depth analysis of nucleotides and nucleosides in plants. In this review, we focus on the current state-of-the-art of nucleotide analysis in plants with liquid chromatography coupled to mass spectrometry and describe recent major advances. Tissue disruption, quenching, liquid–liquid and solid-phase extraction, chromatographic strategies, and peculiarities of nucleotides and nucleosides in mass spectrometry are covered. We describe how the different steps of the analytical workflow influence each other, highlight the specific challenges of nucleotide analysis, and outline promising future developments. The metabolite matrix of plants is particularly complex. Therefore, it is likely that nucleotide analysis methods that work for plants can be applied to other organisms as well. Although this review focuses on plants, we also discuss advances in nucleotide analysis from non-plant systems to provide an overview of the analytical techniques available for this challenging class of metabolites.

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The search for and analysis of direct samples of early Solar System aqueous fluids

Philosophical Transactions of The Royal Society A Mathematical Physical and Engineering Sciences ◽

10.1098/rsta.2015.0386 ◽

2017 ◽

Vol 375 (2094) ◽

pp. 20150386 ◽

Cited By ~ 5

Author(s):

Michael E. Zolensky ◽

Robert J. Bodnar ◽

Hisayoshi Yurimoto ◽

Shoichi Itoh ◽

Marc Fries ◽

...

Keyword(s):

Solar System ◽

Fluid Inclusions ◽

State Of The Art ◽

Analytical Techniques ◽

Real Data ◽

Aqueous Fluid ◽

Early Solar System ◽

Solid Materials ◽

Current State

We describe the current state of the search for direct, surviving samples of early, inner Solar System fluids—fluid inclusions in meteorites. Meteoritic aqueous fluid inclusions are not rare, but they are very tiny and their characterization is at the state of the art for most analytical techniques. Meteoritic fluid inclusions offer us a unique opportunity to study early Solar System brines in the laboratory. Inclusion-by-inclusion analyses of the trapped fluids in carefully selected samples will, in the immediate future, provide us detailed information on the evolution of fluids as they interacted with anhydrous solid materials. Thus, real data can replace calculated fluid compositions in thermochemical calculations of the evolution of water and aqueous reactions in comets, asteroids, moons and the terrestrial planets. This article is part of the themed issue ‘The origin, history and role of water in the evolution of the inner Solar System’.

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Behavioral Genetics: Concepts for Research and Practice in Language Development and Disorders

Journal of Speech Language and Hearing Research ◽

10.1044/jshr.3805.1126 ◽

1995 ◽

Vol 38 (5) ◽

pp. 1126-1142 ◽

Cited By ~ 14

Author(s):

Jeffrey W. Gilger

Keyword(s):

Language Development ◽

Behavioral Genetics ◽

State Of The Art ◽

Genetic Research ◽

Great Promise ◽

Behavioral Genetic ◽

Fine Grained ◽

Future Goals ◽

Current State ◽

Research Designs

This paper is an introduction to behavioral genetics for researchers and practioners in language development and disorders. The specific aims are to illustrate some essential concepts and to show how behavioral genetic research can be applied to the language sciences. Past genetic research on language-related traits has tended to focus on simple etiology (i.e., the heritability or familiality of language skills). The current state of the art, however, suggests that great promise lies in addressing more complex questions through behavioral genetic paradigms. In terms of future goals it is suggested that: (a) more behavioral genetic work of all types should be done—including replications and expansions of preliminary studies already in print; (b) work should focus on fine-grained, theory-based phenotypes with research designs that can address complex questions in language development; and (c) work in this area should utilize a variety of samples and methods (e.g., twin and family samples, heritability and segregation analyses, linkage and association tests, etc.).

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Schizophrenia Research: Current State of the Art

Contemporary Psychology ◽

10.1037/015267 ◽

1976 ◽

Vol 21 (7) ◽

pp. 497-498

Author(s):

STANLEY GRAND

Keyword(s):

State Of The Art ◽

Current State

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Umbral Calculus

The Electronic Journal of Combinatorics ◽

10.37236/24 ◽

2002 ◽

Vol 1000 ◽

Author(s):

A. Di Bucchianico ◽

D. Loeb

Keyword(s):

19Th Century ◽

Finite Differences ◽

State Of The Art ◽

Umbral Calculus ◽

Current State ◽

Logical Foundation ◽

Complete Bibliography ◽

The 19Th Century ◽

Mathematical Literature

We survey the mathematical literature on umbral calculus (otherwise known as the calculus of finite differences) from its roots in the 19th century (and earlier) as a set of “magic rules” for lowering and raising indices, through its rebirth in the 1970’s as Rota’s school set it on a firm logical foundation using operator methods, to the current state of the art with numerous generalizations and applications. The survey itself is complemented by a fairly complete bibliography (over 500 references) which we expect to update regularly.

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