检索结果-南通市图书馆

Sensitivity analysis of using diethanolamine instead of methyldiethanolamine solution for GASCO’S Habshan acid gases removal plant

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers in Energy 2019年第2期13卷 317-324页

作者： Samah Zaki NAJI ammar Ali ABD Chemical Engineering Department Curtin UniversityPerthBentleyWA 6102Australia Petroleum Department Engineering Kerbala UniversityIraq Water Resources Engineering College Al-Qasim Green UniversityIraq

Sweeting natural gas processes are mainly focused on removing carbon dioxide (CO2) and hydrogen sulfide (H2S). The high-energy requirements and opera-tional limitations make amine absorption process sensitive to any change in conditions. This paper presented a steady- state simulation using Hysys to reasonably predict removal amounts of carbon dioxide and hydrogen sulfide from natural gas with the diethanolamine (DEA) solvent. The product specifications are taken from the real plant (GASCO5S Habshan) which uses the methyldiethanola-mine (MDEA) solvent, while this simulation uses DEA under the same operation conditions. First, the simulation validation has been checked with the data of the real plant. The results show accurate prediction for CO2 slippage and accepted agreement for H2S content compared with the data of the plant. A parametric analysis has been performed to test all possible parameters that affect the performance of the acid gases removal plant. The effects of operational parameters are examined in terms of carbon dioxide and hydrogen sulfide contents in clean gas and reboiler duty.

关键词： acid gas diethanolamine methyldiethanola-mine carbon dioxide capturing HYSYS simulation

Novel Path Counting-Based Method for Fractal Dimension Estimation of the Ultra-Dense Networks

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Intelligent Automation & Soft Computing 2023年第4期36卷 561-572页

作者： Farid Nahli Alexander Paramonov Naglaa F.Soliman Hussah Nasser AlEisa Reem Alkanhel ammar Muthanna Abdelhamied A.Ateya Department of Telecommunication Networks and Data Transmission The Bonch-Bruevich Saint-Petersburg State University of TelecommunicationsSaint Petersburg193232Russia Department of Information Technology College of Computer and Information SciencesPrincess Nourah bint Abdulrahman UniversityRiyadh84428Saudi Arabia Department of Computer Sciences College of Computer and Information SciencesPrincess Nourah bint Abdulrahman UniversityRiyadh84428Saudi Arabia Department of Electronics and Communications Engineering Zagazig UniversityZagazig44519SharqiaEgypt

Next-generation networks,including the Internet of Things(IoT),ﬁfth-generation cellular systems(5G),and sixth-generation cellular systems(6G),suf-fer from the dramatic increase of the number of deployed *** puts high constraints and challenges on the design of such *** changing of the network is one of such challenges that affect the network performance,includ-ing the required quality of service(QoS).The fractal dimension(FD)is consid-ered one of the main indicators used to represent the structure of the communication *** this end,this work analyzes the FD of the network and its use for telecommunication networks investigation and *** clus-ter growing method for assessing the FD is introduced and *** article proposes a novel method for estimating the FD of a communication network,based on assessing the network’s connectivity,by searching for the shortest *** the cluster growing method,the proposed method does not require multiple iterations,which reduces the number of calculations,and increases the stability of the results ***,the proposed method requires less compu-tational cost than the cluster growing method and achieves higher *** method is quite simple to implement and can be used in the tasks of research and planning of modern and promising communication *** developed method is evaluated for two different network structures and compared with the cluster growing *** validate the developed method.

关键词： Cluster growing connectivity dense networks fractal dimension network structure shortest route quality of service

Global research production in neonatal abstinence syndrome: A bibliometric analysis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Clinical Pediatrics 2022年第3期11卷 307-320页

作者： Sa'ed H Zyoud Samah W Al-Jabi Moyad Jamal Shahwan ammar Abdulrahman Jairoun Department of Clinical and Community Pharmacy College of Medicine and Health SciencesAn-Najah National UniversityNablus 44839Palestine Poison Control and Drug Information Center College of Medicine and Health SciencesAn-Najah National UniversityNablus 44839Palestine Clinical Research Centre An-Najah National University HospitalNablus 44839Palestine Clinical Sciences Ajman UniversityAjman 2758United Arab Emirates Centre of Medical and Bio‑allied Health Sciences Research Ajman UniversityAjman 2758United Arab Emirates Department of Health and Safety Dubai MunicipalityDubai 67United Arab Emirates

BACKGROUND Recently,neonatal abstinence syndrome(NAS)emerged as a significant global concern with a dramatic increase in healthcare *** incidence of the NAS has increased notably in the past decade and emergence as a global public health *** To evaluate the development and trend of global NAS research from 1958 to 2019 by bibliometric *** Analyzed aspects included publication output per year,language,document types,journals,countries/territories,h-index,authors,and top research *** VOSviewer was used to determine the top research priorities,and trends,and to present bibliometric networks concerning various dimensions,such as coauthorship,authors,and *** A total of 1738 articles were retrieved in the Scopus database from 1958 to *** was found that the great majority of the total NAS documents(n=1295)were original articles followed by reviews(n=268)and letters(n=48).The most productive countries in the NAS field were the United States(n=833),Canada(n=112),the United Kingdom(n=111),and Germany(n=77).Treatment and hospital outcomes in NAS,evidence-based nurse-driven interventions for the care of newborns with NAS,and a systematic reviews and network meta-analysis for therapeutic approaches of NAS were found in recent years(after 2010),compared with terms such as pathophysiology,mechanisms of NAS,and signs and symptoms in the early *** Treatment and pediatric outcomes and the effectiveness of pharmacological treatment may be frontiers in the NAS field,and continued efforts from researchers are needed in those topics.

关键词： Neonatal abstinence syndrome Bibliometric Scopus VOSviewer Visualization

Friction welding influence on microstructure,microhardness and hardness behavior of CrNiMo steel(AISI 316)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Welding 2023年第3期32卷 21-27页

作者： ammar Jabbar Hassan Billel Cheniti Brahim Belkessa Taoufik Boukharouba Djamel Miroud Nacer-Eddine Titouche Advanced Mechanics Laboratory(LMA) Houari Boumediene University of Sciences and TechnologyEl Alia 16111Bab EzzouarAlgiersAlgeria Research Center in Industrial Technologies Algiers 16014Algeria Science and Engineering Materials Laboratory(LSGM) Houari Boumediene University of Sciences and TechnologyEl Alia 16111Bab EzzouarAlgiersAlgeria Birine Nuclear Research Center Ain OusseraDjelfa 17200Algeria

For joining high Cr,Ni and Mo austenitic stainless steel(AISI 316)by direct drive friction welding(DDFW),with friction weld-ing conditions:rotation speed of 3000 r/min,friction time of 10 s,friction pressure of 130 MPa,forge time of 5 s and forge pressure of 260 *** results of microstructure showed that the temperature at the interface reached 819℃while forge applied between 357-237℃,which subdivided welded joint into four distinct regions of highly plastically deformed zone(HPDZ),thermo-mechanically affected zone(TMAZ),heat affected zone(HAZ)and the base metal,with grain size about 10µm,100µm,90µm and 30µm *** re-gions were created due to dynamic recrystallization(DRX)at the interface and thermo-mechanical deformation with heat diffusion in the neighboring ***,high level of microhardness about 300 HV0.1 and hardness roughly 240 Hv10 at the interface due to HPDZ creation while low level of 240 HV0.1 for microhardness and moderately of 205 HV10 for hardness in neighboring regions.

关键词： friction welding austenitic stainless steel microstructure microhardness hardness

A comprehensive review on residual stresses in turning

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Advances in Manufacturing 2022年第2期10卷 287-312页

作者： ammar H.Elsheikh S.Shanmugan T.Muthuramalingam Amrit Kumar Thakur F.A.Essa Ahmed Mohamed Mahmoud Ibrahim Ahmed O.Mosleh Department of Production Engineering and Mechanical Design Facultyof EngineeringTanta UniversityTanta 31527Egypt Research Centre for Solar Energy Department of PhysicsKoneru Lakshmaiah Education FoundationVaddeswaramAndhra Pradesh 522502India Department of Mechatronics Engineering SRM Institute of Science and TechnologyChennai 603203India Department of Mechanical Engineering KPR Institute Engineering and TechnologyCoimbatoreTamilnaduIndia Department of Mechanical Engineering Faculty of EngineeringKafrelsheikh UniversityKafrelsheikh 33516Egypt Production Engineering and Mechanical Design Department Faculty of EngineeringMinia UniversityMinya 61519Egypt Shoubra Faculty of Engineering Benha UniversityBenhaEgypt

Residual stresses induced during turning processes can affect thequality and performance of machined products,depending on its direction and *** stresses can be highly detrimental as they can lead to creeping,fatigue,and stress corrosion *** final state of residual stresses in a workpiece depends on its material as well as the cutting-tool configuration such as tool geometry/coating,cooling and wear conditions,and process parameters including the cutting speed,depth-ofcut and ***,there have been disagreements in some literatures regarding influences of the abovementioned factors on residual stresses due to different cutting conditions,tool parameters and workpiece materials used in the specific *** review paper categorizes different methods in experimental,numerical and analytical approaches employed for determining induced residual stresses and their relationships with cutting conditions in a turning *** is presented for the effects of different cutting conditions and parameters on the final residual stresses state.

关键词： Residual stresses Machining Turning:Process parameters

User activities and the heteroseneity of urban space:The case of Dahiyat Al Hussein park

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Architectural Research 2020年第4期9卷 837-857页

作者： Ahlam ammar Sharif Department of Architecture Philadelphia UniversityAmman 19392Jordan

Urban researchers have maintained a constant interest in the complexity and continuity of urban space *** have applied actor-network theory(ANT)to investigate the heterogeneity of spaces and present them through the networks of their users'***,these accounts are predominantly limited in examining the extent to which these spaces may be heterogeneous when exploring such *** paper draws on recent ANT scholarship,which employs an ethnographic research conducted in a main park in a housing project at Dahiyat Al Hussein in Amman,*** findings describe the complex and unpredictable negotiations that occur with in spaces by documenting the varieties and in terrelations among user activity networks within this common and shared urban *** research reveals the extent to which spaces,parks in this case,may be heterogeneous by unpacking their *** conclusions and in sights assert then ecessity of paying attention to design detail and creating designs that are responsive to evolving user activities.

关键词： Actor-network theory User activity networks Space heterogeneity Spatial translations Relational patterns

Users as co-designers:Visual-spatial experiences at Whitworth Art Gallery

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Frontiers of Architectural Research 2020年第1期9卷 106-118页

作者： Ahlam ammar Sharif Department of Architecture Philadelphia UniversityAmmanJordan

The importance of building users in the architectural field has been increasingly acknowledged in architectural *** studies have applied actor-network theory(ANT)to highlight the ways through which users are embedded in relation to the built ***,many of these studies are limited in recognizing the diverse ways users manipulate these relations as they experience the same built environment *** study draws on a recent ANT scholarship by summarizing the ethnographic research of Whitworth Art Gallery in Manchester,United *** show that users see and react to the same built environment in different ways that are not limited to their alignment or misalignment with the *** extend to include diverse interpretations and reactions(destructing,ignoring,noticing,attending,and interacting).The different user experiences explored in this research demonstrate three main themes,namely,entanglements,continuity,and transformation,which suggest new ways of recognizing the need for increasingly adaptable and inviting designs that address different user preferences and desires.

关键词： Actor-network theory Architectural design Design process Design technology User behavior

基于空间句法的遗产地环境分析与优化策略 ——以Shibam历史城市为例

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

基于空间句法的遗产地环境分析与优化策略 ——以Shibam历史城市...

作者：阿马尔（ammar MOHAMMED ABDULSALAM QAMHAN）东南大学

学位级别：硕士

Impairments Approximations in Assembled mmWave and Radio Over Fiber Network

同方学位论文库评论

在线全文

同方学位论文库

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2022年第12期73卷 4885-4895页

作者： Muhammad Irfan Farman Ali Fazal Muhammad Saifur Rahman ammar Armghan Yousaf Khan Faisal Althobiani Rehan Shafiq Mohammed Alshareef Mohammad E.Gommosani Electrical Engineering Department College of EngineeringNajran UniversityNajran61441Saudi Arabia Department of Electrical Engineering Qurtuba University of Science and ITDera Ismail Khan29050Pakistan Department of Electrical Engineering University of Engineering TechnologyMardan23200Pakistan Department of Electrical Engineering College of EngineeringJouf UniversitySakakaSaudi Arabia Faulty of Electrical Engineering University of Engineering and TechnologyPeshawarPakistan Faculty of Maritime Studies King Abdulaziz UniversityJeddah21589Saudi Arabia Department of Electrical Engineering Sarhad University of Science and Information TechnologyPeshawar25220Khyber PukhtunkhwaPakistan Ports&Maritime Transportation Faculty of Maritime Studies King Abdulaziz University JeddahSaudi Arabia Nautical Science Department Faculty of Maritime StudiesKing Abdulaziz UniversityJeddahSaudi Arabia

The fiber nonlinearity and phase noise(PN)are the focused impairments in the optical communication system,induced by high-capacity transmission and high laser input *** channels include high-capacity transmissions that cannot be achieved at the end side without aliasing because of fiber nonlinearity and PN ***,addressing of these distortions is the basic objective for the 5G mobile *** this paper,the fiber nonlinearity and PN are investigated using the assembled methodology of millimeter-wave and radio over fiber(mmWave-RoF).The analytical model is designed in terms of outage probability for the proposed mmWave-RoF *** performance of mmWave-RoF against fiber nonlinearity and PN is studied for input power,output power and length using peak to average power ratio(PAPR)and bit error rate(BER)measuring *** simulation outcomes present that the impacts of fiber nonlinearity and PNcan be balanced for a huge capacity mmWave-RoF model applying input power carefully.

关键词： Fiber nonlinearity phase noise radio over fiber network advanced modulation system