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Emergent limited perioperative transesophageal echocardiography: should new guidelines exist for limited echocardiography training for anesthesiologists?

Yong G. Peng, Gregory M. Janelle

Frontiers of Medicine 2012, Volume 6, Issue 3,   Pages 332-337 doi: 10.1007/s11684-012-0212-8

Abstract:

Bedside limited echocardiography, or focused cardiac ultrasound, continues to gain popularity in many emergency rooms, intensive care units, and operating rooms as a rapid method of assessing unstable patients. Effective monitoring of cardiovascular function in conditions like cardiac arrest or near-arrest is the crucial step to guide successful resuscitative efforts. Transesophageal echocardiography (TEE) has emerged as one of the preferred cardiac diagnostic and monitoring modalities in the intraoperative setting due to the fact that it is less invasive than many other monitors, is immediately accessible, and allows for continuous real-time monitoring of cardiac function. However, the minimum training requirements needed for the anesthesia provider to obtain the competency, knowledge, and skills for basic certification in perioperative TEE far exceed those developed for other medical specialties. We believe there is an urgent need to develop (1) practical guidelines for emergent perioperative TEE use for anesthesiologists and (2) a requisite educational curriculum to teach the basic skills necessary to aid in the diagnosis and treatment of cardiac arrest or near-arrest scenarios. The measures elucidated in this report summarize the efforts of the Department of Anesthesiology at the University of Florida in establishing the necessary steps to make this process not only practical, but accessible to all trainees. We hope that these collective efforts will provide more trainees the confidence in utilizing TEE to aid in establishing a diagnosis in critical situations.

Keywords： transesophageal echocardiography     curriculum     competency training     hemodynamic instability    

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Combustion instability detection using the wavelet detail of pressure fluctuations

JI Junjie, LUO Yonghao

Frontiers in Energy 2008, Volume 2, Issue 1,   Pages 116-120 doi: 10.1007/s11708-008-0019-0

Abstract: A combustion instability detection method that uses the wavelet detail of combustion pressure fluctuations

Keywords： comparison     wavelet approximation     pressure transducer     general pressure     consistent    

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Evaluation of the relative risk of stroke in patients with hypertension using cerebrovascular hemodynamic

HUANG Jiuyi, WANG Guiqing, GUO Jiping, CAO Yifeng, WANG Yan, YANG Yongju, YU Xuehai

Frontiers of Medicine 2007, Volume 1, Issue 3,   Pages 274-278 doi: 10.1007/s11684-007-0052-0

Abstract: The data on the baseline investigation of risk factors, the determination of cerebrovascular hemodynamicIn multivariate analysis, hemodynamic score, age, sex, cigarette smoking, family history of stroke andAmong them, the RR of hemodynamic score was highest.The analysis of doseresponse relationships indicated that when the hemodynamic scores in patients withthe hemodynamic score may be used for quantitative evaluation of relative risks of stroke.

Keywords： inclusion     quantitative evaluation     cerebrovascular     relative     decrease    

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Progress and Prospect of Seafloor Instability Research

Gao Weijian, Li Wei

Strategic Study of CAE 2023, Volume 25, Issue 3,   Pages 109-121 doi: 10.15302/J-SSCAE-2023.03.010

Abstract:

Seafloor instability and secondary submarine geohazards are widely presentHowever, formation mechanisms and controlling factors of seafloor instability are still poorly understoodTo improve the understanding, based on the history and development of seafloor instability, thisengineering geohazards risks, and summarizes popular quantitative analysis methods for seafloor instability, this study proposed the development direction and countermeasures of future seafloor instability

Keywords： seafloor instability     submarine geohazards     formation mechanisms     risk assessment     instability analysis    

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Size-dependent Elastic Instability of Gel CylinderWith Surface Stress

Huang Dianwu,Qiao Ling, Wang Shiji

Strategic Study of CAE 2007, Volume 9, Issue 4,   Pages 50-54

Abstract:

The elastic instability of a gel cylinder was researched with classicalThe non-classic boundary condition of the elastic instability has been educed by the energy functional So a criterion equation of the elastic instability can be got.Through the analysis of the equation, it is found that the elastic instability is relevant to the radius

Keywords： gel cylinder     elastic instability     intrinsic scale     surface effect    

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Modulational Instability of Optical Vortices in Engineered Saturable Media Review

D.G. Pires, N.M. Litchinitser

Engineering 2022, Volume 17, Issue 10,   Pages 31-43 doi: 10.1016/j.eng.2022.04.022

Abstract:

Propagation of light beams in turbid media such as underwater environments, fog, clouds, or biological tissues finds increasingly important applications in science and technology, including bio-imaging, underwater and free-space communication technologies. While many of these applications traditionally relied on conventional, linearly polarized Gaussian beams, light possesses many degrees of freedom that are still largely unexplored, such as spin angular momentum (SAM) and orbital angular momentum (OAM). Here, we present nonlinear light–matter interactions of such complex light beams with "rotational" degrees of freedom in engineered nonlinear colloidal media. By making use of both variational and perturbative approach, we consider non-cylindrical optical vortices, elliptical optical vortices, and higher-order Bessel beams integrated in time (HOBBIT) to predict the dynamics and stability of the evolution of these beams. These results may find applications in many scenarios involving light transmission in strongly scattering environments.

Keywords： Optical vortex     Orbital angular momentum     Modulation instability     Turbid media    

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Underlying mechanism of the hydrothermal instability of Cu

Nadeen Al-Janabi,Abdullatif Alfutimie,Flor R. Siperstein,Xiaolei Fan

Frontiers of Chemical Science and Engineering 2016, Volume 10, Issue 1,   Pages 103-107 doi: 10.1007/s11705-015-1552-0

Abstract: Water induced decomposition of Cu (BTC) (BTC= benzene-1,3,5-tricarboxylate) metal-organic framework (MOF) was studied using dynamic water vapour adsorption. Small-angle X-ray scattering, Fourier transform infrared spectroscopy and differential scanning calorimetry analyses revealed that the underlying mechanism of Cu (BTC) MOF decomposition under humid streams is the interpenetration of water molecules into Cu-BTC coordination to displace organic linkers (BTC) from Cu centres.

Keywords： hydrothermal stability     metal-organic framework (MOF)     open metal sites (OMSs)     dynamic water vapour adsorption    

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Experimental study on the establishment and maintenance of brain death model with pigs

ZHANG Shuijun, SHI Jihua, ZHAI Wenlong, SONG Yan, CHEN Shi

Frontiers of Medicine 2007, Volume 1, Issue 2,   Pages 161-166 doi: 10.1007/s11684-007-0030-6

Abstract: Hemodynamic changes were monitored during the experiment.

Keywords： BD     control     Hemodynamic     cardiopulmonary     modified    

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Mechanisms and impacts of chromosomal translocations in cancers

Jing H. Wang

Frontiers of Medicine 2012, Volume 6, Issue 3,   Pages 263-274 doi: 10.1007/s11684-012-0215-5

Abstract:

Chromosomal aberrations have been associated with cancer development since their discovery more than a hundred years ago. Chromosomal translocations, a type of particular structural changes involving heterologous chromosomes, have made a critical impact on diagnosis, prognosis and treatment of cancers. For example, the discovery of translocation between chromosomes 9 and 22 and the subsequent success of targeting the fusion product BCR-ABL transformed the therapy for chronic myelogenous leukemia. In the past few decades, tremendous progress has been achieved towards elucidating the mechanism causing chromosomal translocations. This review focuses on the basic mechanisms underlying the generation of chromosomal translocations. In particular, the contribution of frequency of DNA double strand breaks and spatial proximity of translocating loci is discussed.

Keywords： DNA double strand breaks     chromosomal translocations     genomic instability     spatial proximity     carcinogenesis    

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p-Cresyl sulfate promotes the formation of atherosclerotic lesions and induces plaque instability by

Hui Han,Yanjia Chen,Zhengbin Zhu,Xiuxiu Su,Jingwei Ni,Run Du,Ruiyan Zhang,Wei Jin

Frontiers of Medicine 2016, Volume 10, Issue 3,   Pages 320-329 doi: 10.1007/s11684-016-0463-x

Abstract:

Coronary atherosclerosis is a major complication of chronic kidney disease. This condition contributes to the increased mortality in dialysis patients. p-Cresyl sulfate (PCS) is a prototype of protein-bound uremic toxins that cannot be efficiently removed through routine dialysis procedures. In the present study, ApoE−/− mice that underwent 5/6 nephrectomy were randomly divided into two groups, namely, vehicle-treated group (n = 20) and PCS-treated group (n = 20). Mice were sacrificed for en face and immunohistological analyses after 8 or 24 weeks of high-fat diet. Rat aortic vascular smooth muscle cells (VSMCs) were treated with phosphate buffer solution or 500 µmol/L PCS for in vitro evaluation. PCS-treated mice were observed to suffer increased atherosclerotic lesions after eight weeks of PCS administration. Moreover, 24 weeks of PCS administration also markedly increased the vulnerability index of aortic plaques. PCS was also observed to facilitate the migration and proliferation of VSMCs during the progression of the disease. Moreover, PCS disturbed the balance between matrix metalloproteinases and tissue inhibitor of metalloproteinases within the plaques. Thus, PCS played a vital role in promoting atherogenesis and disturbing the stability of formed plaques probably by targeting VSMCs.

Keywords： p-cresyl sulfate     atherosclerosis     plaque stability     vascular smooth muscle cell    

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Aerodynamic stability evolution tendency of suspension bridges with spans from 1000 to 5000 m

Frontiers of Structural and Civil Engineering doi: 10.1007/s11709-023-0980-z

Abstract: Aerodynamic instability owing to aerostatic and flutter-related failures is a significant concern inTo analyze the aerodynamic instability, streamlined single-box section (SBS), lattice truss section (We performed three-dimensional (3-D) full-mode flutter analysis and nonlinear aerostatic instabilityRegarding aerostatic instability, the instability wind speed decreases with span to approximately 3000gust wind speed, indicating the probability of aerostatic instability.

Keywords： suspension bridge     super long-span     finite element model     aerodynamic instability     aerodynamic configuration    

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Stability of an annular viscous liquid jet in compressible gases with different properties inside and outside of the jet

Chunji YAN, Maozhao XIE,

Frontiers in Energy 2010, Volume 4, Issue 2,   Pages 198-204 doi: 10.1007/s11708-009-0054-5

Abstract: A spatial linear instability analysis is conducted on an annular viscous liquid jet injected into compressibleTheoretical analysis reveals that there exist 9 dimensionless parameters controlling the instabilityThe Mach number plays a destabilizing role and the inner Mach number has a greater effect on the jet instability

Keywords： liquid jet     dominant wave number     compressibility     instability    

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Generation and repair of AID-initiated DNA lesions in B lymphocytes

Zhangguo Chen,Jing H. Wang

Frontiers of Medicine 2014, Volume 8, Issue 2,   Pages 201-216 doi: 10.1007/s11684-014-0324-4

Abstract:

Activation-induced deaminase (AID) initiates the secondary antibody diversification process in B lymphocytes. In mammalian B cells, this process includes somatic hypermutation (SHM) and class switch recombination (CSR), both of which require AID. AID induces U:G mismatch lesions in DNA that are subsequently converted into point mutations or DNA double stranded breaks during SHM/CSR. In a physiological context, AID targets immunoglobulin (Ig) loci to mediate SHM/CSR. However, recent studies reveal genome-wide access of AID to numerous non-Ig loci. Thus, AID poses a threat to the genome of B cells if AID-initiated DNA lesions cannot be properly repaired. In this review, we focus on the molecular mechanisms that regulate the specificity of AID targeting and the repair pathways responsible for processing AID-initiated DNA lesions.

Keywords： class switch recombination     somatic hypermutation     activation-induced deaminase     DNA repair     genomic instability    

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A novel structural modification to eliminate the early coupling between bending and torsional mode shapes in a cable stayed bridge

Nazim Abdul NARIMAN

Frontiers of Structural and Civil Engineering 2017, Volume 11, Issue 2,   Pages 131-142 doi: 10.1007/s11709-016-0376-4

Abstract: In this paper, a novel structural modification approach has been adopted to eliminate the early coupling between the bending and torsional mode shapes of vibrations for a cable stayed bridge model generated using ABAQUS software. Two lateral steel beams are added to the middle span of the structure. Frequency analysis is dedicated to obtain the natural frequencies of the first eight mode shapes of vibrations before and after the structural modification approach. Numerical simulations of wind excitations are conducted for the 3D model of the cable stayed bridge with duration of 30 s supporting on real data of a strong wind from the literature. Both vertical and torsional displacements are calculated at the mid span of the deck to analyze both the bending and the torsional stiffness of the system before and after the structural modification. The results of the frequency analysis after applying lateral steel beams declared a safer structure against vertical and torsional vibrations and rarely expected flutter wind speed. Furthermore, the coupling between the vertical and torsional mode shapes has been removed to larger natural frequencies magnitudes with a high factor of safety. The novel structural approach manifested great efficiency in increasing vertical and torsional stiffness of the structure.

Keywords： aeroelastic instability     structural damping     flutter wind speed     bending stiffness     torsional stiffness    

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A bionic approach for the mechanical and electrical decoupling of an MEMS capacitive sensor in ultralow force measurement

Frontiers of Mechanical Engineering 2023, Volume 18, Issue 2, doi: 10.1007/s11465-023-0747-1

Abstract: Electrostatic instability was evaluated, and electrostatic decoupling performance was verified on the

Keywords： micro-electro-mechanical system capacitive sensor     bionics     operation instability     mechanical and electrical    

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Title Author Date Type Operation

Emergent limited perioperative transesophageal echocardiography: should new guidelines exist for limited echocardiography training for anesthesiologists?

Yong G. Peng, Gregory M. Janelle

Journal Article

Combustion instability detection using the wavelet detail of pressure fluctuations

JI Junjie, LUO Yonghao

Journal Article

Evaluation of the relative risk of stroke in patients with hypertension using cerebrovascular hemodynamic

HUANG Jiuyi, WANG Guiqing, GUO Jiping, CAO Yifeng, WANG Yan, YANG Yongju, YU Xuehai

Journal Article

Progress and Prospect of Seafloor Instability Research

Gao Weijian, Li Wei

Journal Article

Size-dependent Elastic Instability of Gel CylinderWith Surface Stress

Huang Dianwu,Qiao Ling, Wang Shiji

Journal Article

Modulational Instability of Optical Vortices in Engineered Saturable Media

D.G. Pires, N.M. Litchinitser

Journal Article

Underlying mechanism of the hydrothermal instability of Cu

Nadeen Al-Janabi,Abdullatif Alfutimie,Flor R. Siperstein,Xiaolei Fan

Journal Article

Experimental study on the establishment and maintenance of brain death model with pigs

ZHANG Shuijun, SHI Jihua, ZHAI Wenlong, SONG Yan, CHEN Shi

Journal Article

Mechanisms and impacts of chromosomal translocations in cancers

Jing H. Wang

Journal Article

p-Cresyl sulfate promotes the formation of atherosclerotic lesions and induces plaque instability by

Hui Han,Yanjia Chen,Zhengbin Zhu,Xiuxiu Su,Jingwei Ni,Run Du,Ruiyan Zhang,Wei Jin

Journal Article

Aerodynamic stability evolution tendency of suspension bridges with spans from 1000 to 5000 m

Journal Article

Stability of an annular viscous liquid jet in compressible gases with different properties inside and outside of the jet

Chunji YAN, Maozhao XIE,

Journal Article

Generation and repair of AID-initiated DNA lesions in B lymphocytes

Zhangguo Chen,Jing H. Wang

Journal Article

A novel structural modification to eliminate the early coupling between bending and torsional mode shapes in a cable stayed bridge

Nazim Abdul NARIMAN

Journal Article

A bionic approach for the mechanical and electrical decoupling of an MEMS capacitive sensor in ultralow force measurement

Journal Article