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Characterization of Perineum Elasticity and Pubic Bone-Perineal Critical Distance with a Novel Tactile Probe: Results of an Intraobserver Reproducibility Study

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Open Journal of Obstetrics and Gynecology 2020年第4期10卷 493-503页

作者： Justin S. Brandt Todd Rosen Heather Van Raalte viktors kurtenos Vladimir Egorov Department of Obstetrics Gynecology and Reproductive Sciences Division of Maternal-Fetal Medicine Rutgers Robert Wood Johnson Medical School New Brunswick NJ USA. Princeton Urogynecology Princeton NJ USA. Advanced Tactile Imaging Inc. Trenton NJ USA.

Background: Tactile imaging provides biomechanical mapping of soft tissues. Objective biomechanical and anatomical assessment of critical structures within the vagina and pelvis may allow development and validation of a clinical tool that could assist with clinical decisions regarding obstetrical procedures and mode of delivery. Objective: To assess intraobserver reproducibility of measurements of perineal elasticity and pubic bone-perineal critical distance with a novel tactile probe in pregnant women. Methods: An Antepartum Tactile Imager (ATI) was designed with a vaginal probe resembling a fetal skull. The probe comprises 128 tactile sensors on a double curved surface and measures 46 mm in width and 72 mm in length. The probe has a motion tracking sensor that allows acquisition of 3D tactile images. There were two arms of the study. In the first arm, biomechanical mapping of the perineum and pelvic bone location was performed in 10 non-pregnant women for purposes of demonstrating safety and feasibility. In the second arm, biomechanical mapping was performed in 10 pregnant women to explore intraobserver reproducibility. Each subject had two standardized examinations over 3 - 5 minutes by the same observer. Examination comfort and pain levels were assessed by post-procedure survey. Reproducibility was analyzed by intraclass correlation coefficients (ICC) with 95% confidence intervals and Bland-Altman plots. Bias and the 95% limits of agreement were also calculated. Results: The safety and feasibility arm of the study demonstrated high degree of safety and tolerability and reliable acquisition of tactile signals. In the reproducibility arm, 10 pregnant women were recruited at mean gestational age of 34.2 ± 6.5 weeks. The mean perineum elasticity (Young’s modulus, E) was 9.8 ± 5.9 kPa, and the mean pubic bone-perineal critical distance (D) at 20 kPa load was 34.6 ± 6.2 mm. The ICC was 0.97 [95% confidence interval (CI) 0.91, 0.99] and 0.82 [CI 0.44, 0.95] for E and D

关键词： Perineal Elasticity Tactile Imaging Elastography Antepartum Predictive Model Delivery Mode Perineum Maternal Birth Trauma

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Use of Unconventional Aggregates in Hot Mix Asphalt Concrete

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Journal of Civil Engineering and Architecture 2024年第1期18卷 30-37页

作者： viktors Haritonovs Dept.of Roads and Bridges Riga Technical UniversityRigaLatvia

The study investigates use of dolomite sand waste as filler or/and sand material plus BOF steel slag as fine and coarse aggregate for design of high performance asphalt *** environmental and economic factors contribute to the growing need for the use of these materials in asphalt concrete *** is particularly important for Latvia,where local crushed dolomite and sandstone does not fulfill the requirements for mineral aggregate in high and medium intensity asphalt pavements *** 100 to 200 thousand tons of steel slag aggregates are produced in ***,it has not been used extensively in asphalt pavement despite its high performance *** sand waste,which is byproduct of crushed dolomite production,is another widely available polydisperse by-product in *** quantity has reached a million of tons and is rapidly *** huge quantity of technological waste needs to be recycled with maximum *** combinations of steel slag,dolomite sand waste and conventional aggregates were used to develop AC 11 asphalt concrete *** mix properties tests include resistance to permanent deformations(wheel tracking test,dynamic creep test)and fatigue *** test results showed that asphalt concrete mixtures containing steel slag and local limestone in coarse portion and dolomite sand waste in sand and filler portions had high resistance to plastic deformations and good resistance to fatigue failure.

关键词： Steel slag dolomite sand waste permanent deformation creep test fatigue

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Cervical Characterization with Tactile-Ultrasound Probe

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Open Journal of Obstetrics and Gynecology 2020年第1期10卷 85-99页

作者： Vladimir Egorov Todd Rosen Heather van Raalte viktors Kurtenoks Advanced Tactile Imaging Trenton NJ USA. Department of Obstetrics Rutgers Robert Wood Johnson Medical School New Brunswick NJ USA. Princeton Urogynecology Princeton NJ USA.

Background: Premature cervical softening and shortening may be considered an early mechanical failure that predisposes to preterm birth. Preliminary clinical studies demonstrate that cervical elastography may be able to quantify this phenomenon and predict spontaneous preterm delivery. Objective: To explore a new approach for cervix elasticity and length measurements with tactile-ultrasound probe. Methods: Cervix probe has tactile array and ultrasound transducer designed to apply controllable load to cervix and acquire stress-strain data for calculation of cervical elasticity (Young’s modulus) and cervical length for four cervix sectors. Average values, standard deviations, intraclass correlation coefficients and the 95% limits of agreement (Bland-Altman plots) were estimated. Results: Ten non-pregnant and ten pregnant women were examined with the probe. The study with non-pregnant women demonstrated a reliable acquisition of the tactile signals. The ultrasound signals had a prolonged appearance;identification of the internal os of the cervix in these signals was not reliable. The study with pregnant women with the gestational age of 25.4 ± 2.3 weeks demonstrated reliable data acquisition with real-time visualization of the ultrasound signals. Average values for cervical elasticity and standard deviations of 19.7 ± 15.4 kPa and length of 30.7 ± 6.6 mm were calculated based on two measurements per 4 sectors. Measurement repeatability calculated as intraclass correlation coefficients between two measurements at the same cervix sector on pregnant women was found to be 0.97 for cervical elasticity and 0.93 for the cervical length. The 95% limits of agreement of 1) cervical elasticity were from ?22.4% to +14.9%, and 2) cervical length from ?13.3% to +16.5%. Conclusions: This study demonstrated clinically acceptable measurement performance and reproducibility. The availability of stress-strain data allowed the computation of cervical elasticity and length. This approach h

关键词： Cervical Elasticity Cervical Length Tactile Ultrasound Elastography Premature Cervical Softening Spontaneous Preterm Delivery

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Performance Characterization of Bituminous Mixtures With Dolomite Sand Waste and BOF Steel Slag

Performance Characterization of Bituminous Mixtures With Dol...

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ISAP2012重载沥青路面和桥面铺装专题会议

作者： viktors Haritonovs Martins Zaumanis Guntis Brencis Juris Smirnovs Riga Technical University Faculty of Civil Engineeringthe Institute of Transportation

＜正＞The rapid growth of transport loads in Latvia determines the needto increase the asphalt carrying capacity on large *** limestone and sandstone that can be found in Latvia,lack the mechanical strength and for most of the large motorways the aggregates are imported from other countries causing increase of the costs and growth of emissions from *** the other hand,large amounts of steel slag（BOF） aggregates with good qualities are being produced in Latvia and gone to *** the recent decades,the

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俄罗斯超高压输电系统(2)——介绍1991年以来前苏联电网的演变及其结构问题与解决办法

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电力工程技术 1998年第3期 55-58页

作者： viktors·Rashkes,贾观宝俄罗斯国家电力研究院江苏省电力局

3 典型设备和线路的参数超高压（EHV）变压器和并联电抗器的容量如表3所示。所有的362kV变压器和多数525kV变压器是三相设备。而787kV和1200kV变压器是由三台单相设备组成的。所有的并联电抗器是单相设备,它具有绝缘的中性点（一分... 详细信息

3 典型设备和线路的参数超高压（EHV）变压器和并联电抗器的容量如表3所示。所有的362kV变压器和多数525kV变压器是三相设备。而787kV和1200kV变压器是由三台单相设备组成的。所有的并联电抗器是单相设备,它具有绝缘的中性点（一分钟交流试验电压为85kV）,为了在单相高速重合时熄灭二次电弧电流,可以在中性点连接中性点电抗器。

关键词：输电系统电力系统并联电抗器俄罗斯断路器过电压保护过电保护通信线路防护组合导线组合母线暂时过电压电网绝缘水平放电器自动装置操作顺序无功潮流超高压电压停电次数二次电弧

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俄罗斯超高压输电系统(一)——介绍1991年以来前苏联电网的演变及其结构问题与解决办法

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江苏电机工程 1998年第2期17卷 56-59页

作者： viktors.Rashkes 贾观宝俄罗斯国家电力研究院江苏省电力局

关键词：超高压输电系统电网俄罗斯

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