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Water quality soft-sensor prediction in anaerobic process using deep neural network optimized by Tree-structured Parzen Estimator

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Frontiers of Environmental Science & Engineering 2023年第6期17卷 23-35页

作者： Junlang Li Zhenguo Chen Xiaoyong Li Xiaohui Yi Yingzhong Zhao Xinzhong He Zehua Huang Mohamed A.hassaan Ahmed El Nemr Mingzhi Huang SCNU Environmental Research Institute Guangdong Provincial Key Laboratory of Chemical Pollution and Environmental Safety&MOE Key Laboratory of Theoretical Chemistry of EnvironmentSchool of EnvironmentSouth China Normal UniversityGuangzhou 510006China Fujian Environmental Protection Design Institute Co.Ltd Fuzhou 350000China National Institute of Oceanography and Fisheries NIOFAlexandria 21556Egypt SCNU Qingyuan Institute of Science and Technology Innovation Co. Ltd.Qingyuan 511517China

Anaerobic process is regarded as a green and sustainable process due to low carbon emission and minimal energy consumption in wastewater treatment plants(WWTPs).However,some water quality metrics are not measurable in real time,thus influencing the judgment of the operators and may increase energy consumption and carbon *** of the solutions is using a soft-sensor prediction *** article introduces a water quality soft-sensor prediction method based on Bidirectional Gated Recurrent Unit(BiGRU)combined with Gaussian Progress Regression(GPR)optimized by Tree-structured Parzen Estimator(TPE).TPE automatically optimizes the hyperparameters of BiGRU,and BiGRU is trained to obtain the point prediction with GPR for the interval ***,a case study applying this prediction method for an actual anaerobic process(2500 m^(3)/d)is carried *** show that TPE effectively optimizes the hyperparameters of *** point prediction of CODeff and biogas yield,R^(2)values of BiGRU,which are 0.973 and 0.939,respectively,are increased by 1.03%–7.61%and 1.28%–10.33%,compared with those of other models,and the valid prediction interval can be ***,the proposed model is assessed as a reliable model for anaerobic process through the probability prediction and reliable *** is expected to provide high accuracy and reliable water quality prediction to offer basis for operators in WWTPs to control the reactor and minimize carbon emission and energy consumption.

关键词： Water quality prediction Soft-sensor Anaerobic process Tree-structured Parzen Estimator

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45kV薄壁加热器环氧树脂高温绝缘试验研究

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低温与超导 2023年第10期51卷 7-12页

作者：沈默潘皖江刘常乐朱银锋 Mohmmed Mun ELseed hassaan 吴诚中国科学技术大学合肥230031 中国科学院合肥物质科学研究院等离子体物理研究所合肥230022 皖西学院机械与车辆工程学院六安237012 安徽建筑大学机械与电气工程学院合肥230601

环氧树脂是45 kV级薄壁加热器主要绝缘材料,它在高温、高电压状态下的绝缘性能对设备的安全至关重要。本文将环氧树脂样品经高温处理后通过红外光谱测试、介电常数测试、直流耐压测试研究材料的物化性质变化。在结果中观察到了环氧树脂... 详细信息

环氧树脂是45 kV级薄壁加热器主要绝缘材料,它在高温、高电压状态下的绝缘性能对设备的安全至关重要。本文将环氧树脂样品经高温处理后通过红外光谱测试、介电常数测试、直流耐压测试研究材料的物化性质变化。在结果中观察到了环氧树脂材料的表面和内部的差异性变化,在材料表层发生了氧化反应,有酰胺、酮以及羧酸的产生,在内部发生了二次固化反应。研究发现材料的整体耐压强度与加热时间正相关、与加热温度正相关。实验证明等于或低于140℃温度条件下环氧树脂材料的绝缘性能安全可靠。

关键词：绝缘性能环氧树脂薄壁加热器超导磁体电流引线 ITER

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Bond-selective transient phase imaging via sensing of the infrared photothermal effect

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Light(Science & Applications) 2019年第1期8卷 70-81页

作者： Delong Zhang Lu Lan Yeran Bai hassaan Majeed Mikhail E.Kandel Gabriel Popescu Ji-Xin Cheng Department of Biomedical Engineering Boston UniversityBostonMA 02215USA Department of Physics Zhejiang UniversityHangzhou 310028China National Laboratory on High Power Laser and Physics Shanghai 201800China Key Laboratory of High Power Laser and Physics Shanghai Institute of Optics and Fine MechanicsChinese Academy of SciencesShanghai 201800China Department of Bioengineering University of Illinois at Urbana-ChampaignChampaignIL 61801USA Department of Electrical and Computer Engineering University of Illinois at Urbana-ChampaignChampaignIL 61801USA Department of Electrical&Computer Engineering Boston UniversityBostonMA 02215USA Photonics Center Boston UniversityBostonMA 02215USA

Phase-contrast microscopy converts the phase shift of light passing through a transparent specimen,e.g.,a biological cell,into brightness variations in an *** ability to observe structures without destructive fixation or staining has been widely utilized for applications in materials and life *** these advantages,phase-contrast microscopy lacks the ability to reveal molecular *** address this gap,we developed a bond-selective transient phase(BSTP)imaging technique that excites molecular vibrations by infrared light,resulting in a transient change in phase shift that can be detected by a diffraction phase *** developing a time-gated pump-probe camera system,we demonstrate BSTP imaging of live cells at a 50 Hz frame rate with high spectral fidelity,sub-microsecond temporal resolution,and sub-micron spatial *** approach paves a new way for spectroscopic imaging investigation in biology and materials science.

关键词： transient phase utilized

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Primary esophageal tuberculosis mimicking esophageal carcinoma on computed tomography: A case report

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World Journal of Gastrointestinal Surgery 2019年第9期11卷 373-380页

作者： Muhammad Salman Khan Muhammad hassaan Arif Maan Amir Humza Sohail Wasim Ahmed Memon Department of Radiology Aga Khan UniversityKarachi 74800Pakistan Medical College Aga Khan UniversityKarachi 74800Pakistan Department of Surgery New York University Winthrop HospitalNew YorkNY 11501United States

BACKGROUND Tuberculosis(TB)has a rare extrapulmonary manifestation known as esophageal tuberculosis,accounting for 0.2%of total TB *** TB typically presents with dysphagia,with retrosternal pain or odynophagia,but generalized symptoms such as low-grade fever,decreased appetite,and weight loss are also *** carcinoma and Crohn’s disease of the esophagus are important differential diagnoses with similar *** SUMMARY We present a case of a 25-year-old male,who presented with esophageal TB mimicking an esophageal *** work-up,Mantoux test,and chest X-ray were ***-swallow examination showed moderate dilatation of distal esophagus with a nodular and irregular *** tomography showed significant thickening of thoracic and distal esophagus with infiltration into the lesser omentum and large,centrally necrotic lymph nodes on gastro-hepatic ligament suggestive of a possible *** was performed and a biopsy of mural thickening was performed and sent for histopathological *** histopathology report and TB-polymerase chain reaction confirmed the diagnosis of esophageal *** patient was started on antituberculous therapy(ATT),and complete resolution of symptoms and disease was achieved in 6 *** Esophageal TB is an extremely rare,yet important differential diagnosis in a patient presenting with *** TB can mimic esophageal carcinoma on computed tomography *** patient responded well to a complete course of ATT.

关键词： Case report Esophageal tuberculosis Esophageal carcinoma Computed tomography

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High-resolution impedance mapping using electrically activated quantitative phase imaging

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Light(Science & Applications) 2021年第2期10卷 186-196页

作者： Cristina Polonschii Mihaela Gheorghiu Sorin David Szilveszter Gáspár Sorin Melinte hassaan Majeed Mikhail E.Kandel Gabriel Popescu Eugen Gheorghiu International Centre of Biodynamics 060101 BucharestRomania Institute of Information and Communication Technologies Electronics and Applied MathematicsUniversite Catholique de Louvain1348 Louvain-la-NeuveBelgium Quantitative Light Imaging Laboratory Beckman Institute for Advanced Science and TechnologyUniversity of Illinois at Urbana-ChampaignUrbanaIL 61801USA

Retrieving electrical impedance maps at the nanoscale rapidly via nondestructive inspection with a high signal-to-noise ratio is an unmet need,likely to impact various applications from biomedicine to energy *** this study,we develop a multimodal functional imaging instrument that is characterized by the dual capability of impedance mapping and phase quantitation,high spatial resolution,and low temporal *** achieve this,we advance a quantitative phase imaging system,referred to as epi-magnified image spatial spectrum microscopy combined with electrical actuation,to provide complementary maps of the optical path and electrical *** demonstrate our system with high-resolution maps of optical path differences and electrical impedance variations that can distinguish nanosized,semi-transparent,structured coatings involving two materials with relatively similar electrical *** map heterogeneous interfaces corresponding to an indium tin oxide layer exposed by holes with diameters as small as~550 nm in a titanium(dioxide)over-layer deposited on a glass *** show that electrical modulation during the phase imaging of a macro-electrode is decisive for retrieving electrical impedance distributions with submicron spatial resolution-and beyond the limitations of electrode-based technologies(surface or scanning technologies).The findings,which are substantiated by a theoretical model that fits the experimental data very well enable achieving electro-optical maps with high spatial and temporal *** virtues and limitations of the novel optoelectrochemical method that provides grounds for a wider range of electrically modulated optical methods for measuring the electric field locally are critically discussed.

关键词： impedance resolution phase

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Critical Success Factors of Infrastructure PPP Projects in Punjab,Pakistan

Critical Success Factors of Infrastructure PPP Projects in P...

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作者： Muhammad hassaan 山东大学

学位级别：硕士

In many countries,the implementation of Public-private Partnership(PPP)concept has become increasingly more essential method of procuring infrastructure development ***,in Punjab the requirement and demand for infrastructure is huge while the resources are scarce and difficult to meet this *** are few projects implemented in Punjab under PPP concept,but the numbers of such projects are increasing and currently with more than25projects in pipeline,the Government of Punjab is interested to boost infrastructure development with the help of private investment,which is considered as vital source for the developing nations as well as for developed *** aim of this study is to explore the Punjab experience in implementing PPP projects focusing on the success factors considered as critical for *** operational projects were selected and semi-structured interview was carried out with the representative of potential stakeholders involved in these projects.A qualitative approach was applied to identify the Critical Success Factors(CSFs).Nine success factors were identified from literature and by holding discussion with experts and seeking their opinion,five success factors were considered as critical for the success of PPP project in *** to the findings,the CSFs in the context of Punjab are:appropriate risk allocation and sharing,favourable legal and regulatory framework,financial and economic viability,well-organized and committed public agency,and political support and *** is believed that the findings and suggestions presented in this study will assist both the private and public sectors to deliver PPP projects in Punjab more successfully.

关键词： Public-private partnership Critical success factors Punjab Pakistan

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Economic Valuation of Sea Level Rise Impacts on Agricultural Sector: Damietta Governorate, Egypt

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Journal of Environmental Protection 2014年第2期5卷 87-95页

作者： M. A. Abdrabo M. A. hassaan Institute of Graduate Studies and Research University of Alexandria Alexandria Egypt.

The Nile Delta is considered to be one of the most vulnerable river deltas to Sea Level Rise (SLR) in the world. SLR is expected to affect large agricultural areas of the Nile Delta, either through inundation or higher levels and salinity of groundwater. It could be argued that such impacts would augment the problems experienced already in the area in terms of high groundwater table and salinity levels. In order to guide policy and decision making, especially in terms of assessing the economics of various adaptation options, there is a need to provide estimates of potential economic damage that could result from such changes. The paper in hand aims to estimate the economic value of potential primary impacts of higher levels of groundwater table due to expected SLR on agriculture productivity in Damietta Governorate as one of the Nile Delta coastal governorates. To conduct such an assessment, relationship between groundwater table level and agricultural productivity was first investigated in relevant literature. This was followed by reviewing prevailing conditions in the agricultural sector in the study area. Thereafter, a regression analysis for the main crops in the study area, between crop yield and groundwater table levels, was conducted. Based on the developed regression, a GIS (Geographic Information System)-based hydrological model, and a production economic model, were employed to assess economic value of higher levels of groundwater table impacts on agriculture productivity. It was found that future accumulative crop yield loss was estimated, using segmented linear regression, up to the year 2100 to be as much as L.E. 6.43 billion. It is worth mentioning that these estimates do not include indirect impacts of higher levels of groundwater table, which may include loss of jobs and/or earnings, impacts on food supply and food security in the area. A potential adaptation option, namely redesigning and upgrading existing drainage infrastructure, was found to cost

关键词： Sea Level Rise Nile Delta Economic Valuation Agriculture Groundwater Table Level

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湿热老化对CFRP复合材料力学性能的影响

湿热老化对CFRP复合材料力学性能的影响

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作者： hassaan AHMAD BUTT（布特）哈尔滨工业大学

学位级别：硕士

低速冲击一般发生在10米/秒以下。自20世纪70年代初以来,复合材料结构的低速冲击相关研究一直被广泛关注。低速冲击在日常工作环境中较为常见,在航空领域,许多研究人员试图设计出最适合自己重量的最佳结构。当在制造或维修过程中有相应... 详细信息

低速冲击一般发生在10米/秒以下。自20世纪70年代初以来,复合材料结构的低速冲击相关研究一直被广泛关注。低速冲击在日常工作环境中较为常见,在航空领域,许多研究人员试图设计出最适合自己重量的最佳结构。当在制造或维修过程中有相应事故发生,材料结构可能会损失高达50%的强度。由于目前航空航天技术的使用高度依赖于复合材料的使用,因此预测它们对此类事件的行为是至关重要的。在复合材料的服役过程中,其结构将受到一系列环境条件的影响。这些材料必须面对的两个最普遍的条件为温度和湿度,更重要的是它们的组合效应。针对该研究方案,本文对三种不同铺层结构的CFRP的低速冲击性能进行了研究,并比较了其在人工老化和低速冲击条件下的力学性能。在航空航天工业中,通常使用三种常见的CFRP层结构配置,它们是{0/90/45/-45/90/0},{0/-60/-45/60/60/0}和{0/45/90/-45/0}。本研究重点介绍了用T300碳纤维和tde-85基体制备得到的具有三种铺层结构的复合材料。制备得到这些复合材料层合板后,将其切成所需的ASTM标准试样并在水分饱和以及不同温度和湿度的四种不同的组合环境下进行湿热老化试验:组合分别为60°C/60%RH,60°C/90%RH,90°C/60%RH以及90°C/90%RH。基线试验结果表明,对于低速度冲击和冲击后压缩试验,具有较高准各向同性取向的方向的抗冲击性能优于交叉层结构的方向。还可以确定,对于弯曲载荷,这些准各向同性结构更适合处理此类环境中的应力。从湿热测试中,每种铺层方式下甚至在极端环境下试样重量均有所上升。在较低的温度和较低的湿度水平下,每个方向吸收的水分含量较低,随着温度和湿度的增加,样品中水分吸收的量也增加了。通过测试,我们看到的0/-60/-45/90/60/60/0}铺层具有最少的吸湿量,而{0/90/45/-45/90/0}铺层具有最高的吸湿量。最后一铺层结构的吸湿量介于两者之间。交叉层结构的使用的增加会在一定程度降低复合结构的吸水。本研究得到的数据支持这一理论。低速度冲击试验结果表明,湿热老化对低速冲击性能有负面影响。本文研究数据表明,复合材料试样遭受的温度和湿度越高,影响阻力越小,无论试样的铺层结构如何。然而,在使用的四种环境中,{0/-60/-45/60/60/0}铺层结构的试样表现最好,对低速度冲击产生了最大的阻力。低速冲击还对撞击面造成了凹痕伤害,并对层合板的后端造成损坏。然而,在极高的温度条件老化后,低速冲击使层合板试样分层并加剧了表面裂纹的传播。大部分的损伤发生在内部,正如光学数字显微镜和SEM分析所证明的那样。当试样进行湿热老化时,纤维与基体间界面的降解会导致机械性能的丧失,当低速冲击发生时,界面力学性能会被进一步削弱。然而,具有高准各向同性取向的试样(例如{0/-60/-45/90/45/60/0})优于有高交叉层叠铺层的试样(例如{0/90/45/-45/90/0}。利用拉伸和弯曲试验来进一步验证层合板试样的抗压强度和低速冲击阻力的损失。令人惊讶的是,方向{0/90/45/-45/90/0}显示了最高的抗拉强度和最小的老化百分比损失,而方向{0/-60/-45/90/60/0}显示的是最低的平均抗拉强度和最大的性能损失。然而,这种抗拉强度的损失是通过弯曲强度来抵消的,而弯曲强度则显示出相反的趋势。由于在低速冲击时,压应力更占主导地位,弯曲强度在维持机械性能方面起着更大的作用,因此,0/-60/-45/90/60/0}铺层结构的层合板试样具有最优力学性能。试验结果表明,拉伸强度和弯曲强度均依赖于复合材料的厚度方向。在抗拉强度方面,在受力方向具有较高纤维含量的样品具有较高的力学性能,但在抗弯曲强度方面,在受力方向外具有较高纤维含量的样品具有较高的力学性能。最终,通过SEM分析,确定了层合板试样的损伤机理。对于老化试样,自从夹在开始,断裂就持续产生直至试样失效。试样结构显示了纤维与基体界面失效的轻微迹象,其拉出的纤维短,基体碎片小且位于裂缝表面。然而,在高温高湿度老化条件下的试样显示出明显的纤维与基体间界面失效的迹象,拔出纤维较长,并存在空隙,纤维表面无基体碎片。将这些SEM观察结果与力学性能的损失联系起来,从而分析得到纤维与基体间界面在湿热环境下力学性能损失的原因。

关键词：碳纤维复合材料湿热老化低速冲击吸湿力学性能

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Structural Health Monitoring for Reinforced Concrete Containment Using Inner Electrical Resistivity Method

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Open Journal of Civil Engineering 2021年第3期11卷 317-341页

作者： Mostafa hassaan Mohamed Ihab Elmasry Nabil El Ashkar Construction and Building Engineering Department Arab Academy for Science Technology and Maritime Transport Alexandria Egypt

Nuclear power plants (NPPs) are considered as the main source for generating electricity nowadays in some countries. The effect of impact of heavy fully loaded aeroplane such as (Boeing 747-200c) causes leakage of the radiation through the cracks generated on the external RC containment of NPPs, and this leads to severe damage for humans and cities. In this research paper, external RC containment is modeled using ANSYS and hit by Boeing 747-200c which is the heavier aeroplane compared to other jets and causes severe damage for external RC containment. In addition, the impact location for Boeing 747-200c is considered at 30 m vertical height. RC containment response was studied after the impact of an aeroplane and a proposed structural health monitoring technique is applied using embedded sensors in order to detect and locate the embedded cracks that is generated due to the effect of impact of heavy aeroplane. It was concluded that RC containment is intact except for the impact region which is damaged. An experimental program was applied on a part of the element in ANSYS which is away from the impact region. Four specimens were cast using heavy weight concrete in laboratory. Three cracked specimens consist of different lengths of vertical cracks which represent different times of impact in order to replicate crack propagation as in ANSYS. The cracks are simulated inside laboratory specimens using failure criteria. The parameters used in detecting the cracks for specimens are the percentage change in electrical resistivity and Decimal Logarithm

关键词： Reinforced Concrete Containment Structural Health Monitoring Electrical Resistivity

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直拉式单晶硅生长炉超导磁体研究

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安徽建筑大学学报 2022年第3期30卷 67-73,104页

作者：吴小四朱银锋唐梦雨郑旭 Mohmmed Mun ELseed hassaan 安徽建筑大学机械与电气工程学院安徽合肥230601 中国科学院合肥物质科学研究院等离子体所安徽合肥230031 中国科学技术大学核科学技术学院安徽合肥230601

高集成度芯片发展使半导体行业对硅单晶材料提出尺寸与质量的要求。直拉法(Cz法)可生成大尺寸硅单晶,但生长中产生热对流,边界层不稳定,晶体易生杂质。因磁场对导电熔体内对流有抑制效果,通过外加磁场可提高生成大尺寸晶体的品质。基于... 详细信息

高集成度芯片发展使半导体行业对硅单晶材料提出尺寸与质量的要求。直拉法(Cz法)可生成大尺寸硅单晶,但生长中产生热对流,边界层不稳定,晶体易生杂质。因磁场对导电熔体内对流有抑制效果,通过外加磁场可提高生成大尺寸晶体的品质。基于现有研究结果提出了一种用于单晶炉的瓦状结构超导磁体,确定线圈结构参数、导体类型、屏蔽体厚度及磁芯高度,使其满足大尺寸、高品质单晶硅生长所需的磁场强度(约0.5T)及磁场位型,从而降低漏磁。借助数值分析优化超导磁体结构参数,有望为后续的MCZ硅单晶生长工艺参数提供参考。

关键词：超导磁体磁场直拉法导体结构参数匝数排布磁场强度

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