检索结果-南通市图书馆

China Foundry 2018年第2期15卷 145-151页

作者： artur bobrowski Dariusz Drozynski Beata Grabowska Karolina Kaczmarska Zaneta Kurleto–Koziol Marcin Brzezinski AGH University of Science and Technology Faculty of Foundry EngineeringKrakowpoland

This paper presents results of thermoanalytical and structural research on phenolic binder used in foundry for the preparation of moulding sand. The binder has been prepared based on resole type phenolic resin with the addition of ester hardener. The aim of the study was to determine the structural changes taking place in the phenolic binder under the influence of temperature. Results show that in the investigated range of temperatures, phenolic binder exhibits three exothermic thermal effects accompanying the decomposition process. The test results using the Diffuse Reflectance Infrared Fourier Transform Spectroscopy(DRIFTS) technique show that the addition of a hardener stabilizes the binder structure within methylene bridges. The reduction in the reaction rate observed in the DTA curve at about 330 °C can be associated with the formation of gaseous products by decomposition of the binder or, as suggested by the literature data, the formation of triple bonds and CN-HCN groups.

关键词： phenolic resin thermal decomposition IR spectroscopy thermal analysis DRIFTS

Quantum dense coding with gravitational cat states

在线全文

学校读者我要写书评

暂无评论

Communications in Theoretical Physics 2024年第3期76卷 84-90页

作者： Saeed Haddadi Mehrdad Ghominejad artur Czerwinski Faculty of Physics Semnan UniversityP.O.Box 35195-363SemnanIran Centre for Quantum Optical Technologies Centre of New TechnologiesUniversity of WarsawBanacha 2c02-097 WarszawaPoland

A protocol of quantum dense coding with gravitational cat states is *** explore the effects of temperature and system parameters on dense coding capacity and provide an efficient strategy to preserve the quantum advantage of dense coding for these *** results may open new opportunities for secure communication and insights into the fundamental nature of gravity in the context of quantum information processing.

关键词： quantum dense coding gravitational cat states quantum advantage

Impact of tourism on the vigilance behavior of the Cyprus rock agama(Laudakia cypriaca)

在线全文

学校读者我要写书评

暂无评论

Integrative Zoology 2024年第3期19卷 577-583页

作者： artur GOLAWSKI Iris CHARALAMBIDOU Sylwia GOLAWSKA Faculty of Sciences Siedlce University of Natural Sciences and HumanitiesSiedlcePolandand Department of Life Sciences School of Life and Health SciencesUniversity of NicosiaNicosiaCyprus

Escape behavior is a common antipredator strategy among wild ***,we investigated the effect of four factors on the vigilance behavior of the endemic Cyprus rock agama(Laudakia cypriaca).Flight initiation distance(FID,the minimum distance to which an observer can approach a lizard before it flees)was measured in relation to the type of location(tourist *** area),the observer’s starting distance,air temperature,and substrate *** collected data for 39 agamas in tourist areas and 34 of these lizards in nontourist *** a whole,the mean starting distance was 10.5 m and the FID was 3.6 *** average substrate temperature was 34.0℃ and the average air temperature 29.6℃.Only the type of area affected the agamas’escape decisions with FID being 1.8 m shorter in tourist areas than in nontourist areas(2.7 m vs.4.5 m).This is probably due to the habituation of lizards to the presence of humans in the former *** study shows that tourism strongly affects the behavior of lizards,which may have consequences for the functioning of the *** can increase the safety of lizards by creating a human shield to deter *** the tourist season is over,lizards may become more vulnerable to predators.

关键词： anthropogenic disturbance flight initiation distance lizards tourism vigilance behavior

Accounting for Quadratic and Cubic Invariants in Continuum Mechanics–An Overview

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Fluid Dynamics & Materials Processing 2024年第9期20卷 1925-1939页

作者： artur V.Dmitrenko Vladislav M.Ovsyannikov Department of Physics National Research Nuclear University(MEPhI)Kashirskoye Shosse 31Moscow115409Russian Federation Department of Thermal Engineering and Department of Waterways Ports and Hydraulic StructuresRussian University of Transport(MIIT)Obraztsova Street 9Moscow127994Russian Federation

The differential equations of continuum mechanics are the basis of an uncountable variety of phenomena and technological processes in fluid-dynamics and related *** equations contain derivatives of the first order with respect to *** derivation of the equations of continuum mechanics uses the limit transitions of the tendency of the volume increment and the time increment to *** are used to derive the wave *** differential wave equation is second order in ***,increments of volume and increments of time in continuum mechanics should be considered as small but finite quantities for problems of wave *** is important for calculating the generation of sound waves and water hammer ***,the Euler continuity equation with finite time increments is of *** finiteness of the time increment makes it possible to take into account the quadratic and cubic invariants of the strain rate *** is a new branch in *** and cubic invariants will be used in differential wave equations of the second and third order in time.

关键词： Quadratic invariant cubic invariant continuity equation generation of periodic waves N.E.Zhukovsky’s hydraulic shock turbulence

Application of the Electrical Resistivity Method in Precision Agriculture of Coffee Cultivation, in the Kabiri Area, Ícolo e Bengo Township, Luanda, Angola

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

International Journal of Geosciences 2024年第9期15卷 720-736页

作者： Gerson Itembo artur Miguel Nelson Mateta Idvano Costa Miguel Clemente Júlio Kuende Department of Geosciences Instituto Superior Politcnico de Tecnologias e Cincias (ISPTEC) Luanda Angola

The electrical resistivity method is a geophysical tool used to characterize the subsoil and can provide an important information for precision agriculture. The lack of knowledge about agronomic properties of the soil tends to affect the agricultural coffee production system. Therefore, research related to geoelectrical properties of soil such as resistivity for characterization the region of the study for coffee cultivation purposes can improve and optimize the production. This resistivity method allows to investigate the subsurface through different techniques: 1D vertical electrical sounding and electrical imaging. The acquisition of data using these techniques permitted the creation of 2D resistivity cross section from the study area. The geoelectrical data was acquired by using a resistivity meter equipment and was processed in different softwares. The results of the geoelectrical characterization from 1D resistivity model and 2D resistivity electrical sections show that in the study area of Kabiri, there are 8 varieties of geoelectrical layers with different resistivity or conductivity. Near survey in the study area, the lowest resistivity is around 0.322 Ω·m, while the highest is about 92.1 Ω·m. These values illustrated where is possible to plant coffee for suggestion of specific fertilization plan for some area to improve the cultivation.

关键词： Electrical-Resistivity Method Precision Agriculture Coffee

低共熔溶剂对蛋白酶法亲水改性锦纶纤维的影响

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

纺织高校基础科学学报 2024年第1期37卷 10-18页

作者：汪慧怡李蓉卢雨正 artur Cavaco-Paulo 傅佳佳江南大学江苏省功能纺织品工程技术研究中心江苏无锡214122 米尼奥大学生物工程中心葡萄牙布拉加4710-057

针对锦纶织物亲水性较差的问题,采用商用菠萝蛋白酶对其表面进行改性。通过单因素变量实验对反应残液进行紫外光吸光度测试以及静态接触角测试,确定菠萝蛋白酶处理锦纶的优化工艺条件,即在蛋白酶质量浓度32 mg/mL,pH 6.0,温度50℃,反应... 详细信息

针对锦纶织物亲水性较差的问题,采用商用菠萝蛋白酶对其表面进行改性。通过单因素变量实验对反应残液进行紫外光吸光度测试以及静态接触角测试,确定菠萝蛋白酶处理锦纶的优化工艺条件,即在蛋白酶质量浓度32 mg/mL,pH 6.0,温度50℃,反应时间18 h条件下,可实现织物表面的亲水化转变。在优化工艺的基础上使用体积分数为40%CHCL-2EG低共熔溶剂缓冲液体系辅助激活菠萝蛋白酶,并对水解效果进行测试分析,发现CHCL-2EG对锦纶纤维具有刻蚀作用,织物表面粗糙程度增加,织物表面亲水效果进一步增强,最终接触角降低36.7%。

关键词：锦纶织物菠萝蛋白酶低共熔溶剂水解表面改性激活

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

基于响应面法优化脂肪酶水解涤纶织物工艺

纺织高校基础科学学报 2024年第2期37卷 62-71页

作者：陆佳佳傅佳佳李蓉卢雨正 artur Cavaco-Paulo 江南大学江苏省功能纺织品工程技术研究中心江苏无锡214122 米尼奥大学生物工程中心葡萄牙布拉加4710-057

酶处理改善涤纶织物的亲水性是目前涤纶改性中一种绿色环保的方法。本文通过改变猪胰脂肪酶(PPL)水解涤纶织物的反应条件(反应温度、反应pH、酶用量、反应时间),以及添加表面活性剂来增强PPL水解涤纶织物的效果。实验以水解产物释放量... 详细信息

酶处理改善涤纶织物的亲水性是目前涤纶改性中一种绿色环保的方法。本文通过改变猪胰脂肪酶(PPL)水解涤纶织物的反应条件(反应温度、反应pH、酶用量、反应时间),以及添加表面活性剂来增强PPL水解涤纶织物的效果。实验以水解产物释放量为评价指标,通过在单因素实验的基础上进行Box-Behnken优化实验。结果表明:PPL水解涤纶织物工艺中因素的影响作用大小顺序为反应时间(24 h)>表面活性剂(吐温80,2 g/L)>反应温度(60℃)>酶用量(80 U/mL)>pH(7)。经模型优化的最佳水解工艺条件为:反应温度59℃,pH 6.6,酶用量67 U/mL,反应时间31.2 h,表面活性剂质量浓度2.1 g/L,理论水解产物531.862 mg/L。最优条件下实验值与预测值的相对误差为5.3%。在此条件下,处理后织物表面的接触角下降了19.8%,力学性能良好。

关键词：涤纶猪胰脂肪酶水解亲水性表面活性剂响应面设计

维普期刊数据库博看期刊

在线全文

学校读者我要写书评

暂无评论

聚酯纤维亲水改性研究进展及其发展方向

服装学报 2024年第3期9卷 189-197页

作者：赵晓曼刘文静陈单单洪剑寒王鸿博 CAVACO-PAULO artur 绍兴文理学院纺织科学与工程学院浙江绍兴312000 绍兴文理学院浙江省清洁染整技术研究重点实验室浙江绍兴312000 绍兴文理学院纤维基复合材料国家工程研究中心绍兴分中心浙江绍兴312000 江南大学江苏省功能纺织品工程技术研究中心江苏无锡214122 米尼奥大学生物工程中心葡萄牙布拉加4710-057

聚酯纤维具有良好的机械性能和化学稳定性,但由于缺少极性基团,其亲水性较差,在某些领域的应用受到限制。通过介绍聚酯纤维亲水改性的原理,综述聚酯纤维加工工艺中聚合物合成阶段、纺丝阶段、染色整理阶段和后整理阶段所采用的多种亲水... 详细信息

聚酯纤维具有良好的机械性能和化学稳定性,但由于缺少极性基团,其亲水性较差,在某些领域的应用受到限制。通过介绍聚酯纤维亲水改性的原理,综述聚酯纤维加工工艺中聚合物合成阶段、纺丝阶段、染色整理阶段和后整理阶段所采用的多种亲水改性方法,分析归纳各种改性方法的优缺点,为后续聚酯纤维亲水改性方法的选择提供参考,并为其在纺织和环保领域的应用提供新的可能性。分析表明,未来应该在优化现有聚酯纤维改性方法的基础上,积极探索并发展更环保的亲水改性新方法,提高改性纤维的稳定性并实现多功能化,从而更好地满足不断发展的应用需求。

关键词：聚酯纤维亲水基团亲水改性后整理多功能化

In-Hospital Outcomes in Minimally Invasive Mitral Valve Surgery: First Results in a Brazilian Single Center

在线全文

学校读者我要写书评

暂无评论

Open Journal of Thoracic Surgery 2024年第1期14卷 17-28页

作者： Daniel de Magalhães Freitas João Alberto Pansani Max Weyler Nery Stanlley de Oliveira Loyola Maurício Lopes Prudente Giulliano Gardenghi artur Henrique de Souza Department of Cardiovascular Surgery Encore Hospital Aparecida de Goiania Brazil Anesthesia Clinic (Clianest) Goiania Brazil

Introduction: Treatments for cardiovascular diseases have increasingly evolved with the tendency to offer minimally invasive or transcatheter procedures instead of conventional sternotomy surgery. In this context, we highlight minimally invasive mitral valve surgery (MIMVS), which has been shown to be an increasingly solid option with some superior results when compared to the conventional technique: better pain control, shorter hospital stays, shorter recovery time, shorter readmission rate in the first postoperative year, better aesthetic results, and lower overall cost. Aim: This study aims to evaluate the stages of MIMVS, by primary mitral valve consultation, in our service and compare these results with data from the literature. Methods: All electronic medical records of patients who underwent MIMVS for primary mitral valve injury in the Encore Hospital from January 2020 to February 2023 were analyzed. Tabulation and statistical analysis were performed using the Microsoft Excel® program. Quantitative variables were presented as means, standard deviations. Results: 46 patients were enrolled in our study (Age: 59.1 ± 12.4 years old;60.8% Female, BMI: 26 ± 4.4 Kg/m2, Low risk STS score: 82.6%). The observed 30-day mortality was 2.1%, plastic rate of 23.9%, blood transfusion rate of 41.3%, length of stay in an intensive care bed (ICB) of 3.3 ± 3.3 days and hospital stay of 6.4 ± 5.1 days. Conclusions: We noticed that the MIMVS results carried out in our service agree with data from national and international literature with approximately 1.3 days more hospitalization in ICB.

关键词： Minimally Invasive Surgical Procedures Mitral Valve Outcome Assessment Health Care

Iron-Deficiency Anemia Management in Gynecological Surgery: A Review of Current Evidence and Best Practices

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Obstetrics and Gynecology 2024年第8期14卷 1223-1241页

作者： Aline Evangelista Santiago artur Lima Sendin Víctor Nilo Nogueira Rogério Adão Braga Admilson Lemos Costa Filho Eduardo Batista Cândido Agnaldo Lopes Silva Filho Department of Gynecology and Obstetrics Faculty of Medicine Santo Amaro University (UNISA) So Paulo Brazil Department of Gynecology and Obstetrics Federal University of Minas Gerais (UFMG) Belo Horizonte Brazil Department of Gynecology and Obstetrics Faculty of Medicine So Paulo State University (UNESP) So Paulo Brazil

Purpose: Due to the high prevalence of iron deficiency anemia in women undergoing gynecological surgeries and its association with worse postoperative results, it is necessary to identify and treat anemia preoperatively. However, although anemia and iron deficiency are significant global health problems, there are still disparities in the recognition and implementation of “Patient Blood Management” (PBM) as a comprehensive approach to mitigating the risks associated with these diseases. The purpose of the study is to review best practices for the treatment of anemia based on the Enhanced Recovery After Surgery (ERAS) protocol and PBM recommendations. Methods: This study reviewed the literature on preoperative iron deficiency anemia in patients undergoing gynecological surgery. We identified references through searches in PubMed using relevant search terms. Results: Among the various strategies used in PBM, perhaps the most important is the early detection and management of anemia. In gynecological surgery, there are several approaches to reducing perioperative blood loss, highlighting the use of gonadotropin-releasing hormone (GnRH) agonists (aGnRh) and antifibrinolytics. Oral and intravenous iron supplementation can be performed in addition to blood transfusion to treat anemia. Conclusion: Addressing preoperative and postoperative anemia through systematic correction, following the guidelines of the ERAS protocol and PBM guidelines, is essential to improving perioperative outcomes in women undergoing gynecological surgery.

关键词： Anemia Gynecological Surgery Iron Supplementation Iron Deficiency