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Epi- and endobiont faunal communities on an Egyptian Mediterranean rocky shore: species composition and their competition for space

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Journal of Oceanology and Limnology 2021年第1期39卷 198-207页

作者： Magdy EL HEDENY mohamed rashwan Sebastián RICHIANO Saleh AL FARRAJ Ghada AL BASHER Department of Geology Faculty of ScienceAlexandria UniversityAlexandria 21568Egypt Department of Biological and Geological Sciences Faculty of EducationAlexandria UniversityAlexandria 14037Egypt Instituto Patagónico de Geología y Paleontología(CONICET-CENPAT) Puerto Madryn 9120Argentina Department of Zoology College of SciencesKing Saud UniversityP.O.Box 2455Riyadh 11451Saudi Arabia

The exposed calcareous rocky area of the Abu Qir Headland,east of Alexandria,Egypt which range from coarse grains,through pebbles,cobbles,and boulders to rocky platforms,was signifi cantly colonized by sclerobionts(epibionts and endobionts).The epibiont species diversity was comparatively higher than that of *** communities included bryozoans(the anascan-grade cheilostome Bifl ustra savartii),serpulid(Hydroides elegans,Spirobranchus ***,Vermiliopsis striaticeps and Protula or Apomatus)and spirorbid(Spirorbis)wormtubes,and balanoid barnacles(Amphibalanus amphitrite,Balanus trigonus,and Perforatus perforatus).The cheilostome bryozoan colonies,which developed extensive sheets,proliferated on the study rocky shore either encrusting the bioeroded basement directly,or encrusting other epilithic taxa,particularly balanoid barnacles and serpulid *** displayed a remarkable marginal competitive interaction(overgrowth and stand-off)for space on the study rocky *** the other hand,endobionts were not well represented on the studied rocky shore *** was possible to identify three ichnotaxa:Gastrochaenolites,Maeandropolydora,and *** fi ndings documented represent a signifi cant contribution to our knowledge of sclerobionts composition,sequence of their colonization and/or bioerosion,and their mutual relationships on the intertidal rocky shore of the Abu Qir Headland.

关键词： sclerobionts encrustation bioerosion Mediterranean Egypt

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Evaluation of Nile Delta-Mediterranean Sea Conjunction Using GPS, Satellite-Based Gravity and Altimetry Datasets

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Journal of Geoscience and Environment Protection 2020年第2期8卷 33-46页

作者： Basem Elsaka Ali M. Radwan mohamed rashwan Institute of Geodesy and Geoinformation University of Bonn Bonn Germany National Research Institute of Astronomy and Geophysics (NRIAG) Helwan Cairo Egypt

Sinking of the Nile Delta region of Egypt is one of urgent issues to be investigated due to its vital importance to numerous perspectives such as economic, environmental and social impact on the whole Egyptian territory. This contribution represents one of the project outcomes entitled “Evaluation of Nile Delta Sinking Hypothesis Using the Global Positioning System (GPS), Tide Gauge and Satellite Altimetry and Gravity Techniques” that has been funded by the Science & Technology Development FUND (STDF), Egypt in the period from 2013 till 2017. To detect the rates of the horizontal and vertical movements, three main geodetic techniques;Global Positioning System (GPS) measurements of Delta region, time-varying gravity models of the Gravity Recovery and Climate Experiment (GRACE) mission to monitor the temporal changes over the delta regions and satellite altimetry time series have been used. Our findings regarding the GPS technique show that the northern part of the Nile Delta region suffers from clear subsidence especially at the eastern and western side as represented by Port Said, Mansoura, Gamalyia, Alexandria and Edfena stations. The central part as well as the surrounding areas of Nile Delta suffers from clear uplift as represented by Tanta, Damnhour and Hamoul stations. Satellite gravity results show erosion rates of the conjunction part of Nile Delta and Mediterranean contact, especially at its eastern (Port Said surrounding areas) and western (Alexandria surrounding areas) parts. As we go inland to the southern part of the Nile Delta, the temporal gravity variations pattern decreases showing that the Delta subsidence follows the regular subsidence pattern, except that for the northern contact part of the Delta to the Mediterranean Sea. This is also supported by satellite altimetry missions which shows a continuously rising rate of the Mediterranean Sea level as detected from the Saral/AltiKa mission.

关键词： Delta Subsidence Deformation Parameters Temporal Gravity Changes Satellite Altimetry

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Evaluation of Deterioration and Proposed Restoration of the Limestone, White Monastery—Sohag, Egypt

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Open Journal of Geology 2017年第9期7卷 1287-1302页

作者： Abd-Elkareem E. Ahmed Ahmed O. Mashaly Basel N. Shalaby mohamed A. rashwan Conservation Department Faculty of Archaeology South Valley University Qena Egypt Geology Department National Research Center Cairo Egypt

By studying the phenomena of limestone built from the White Monastery in Sohag Governorate damage where this study discusses the results of the analyzes and the study’s petrographic limestone, we can study and discuss what has been done to analyze X-ray diffraction and X-ray flourecence, and by scanning electron microscope in order to determine the cause of the damage and to study the properties of limestone to choose the most appropriate treatment methods especially the internal structure affected by the environmental conditions surrounding the private and increasing ground water levels along with the use of the most appropriate ways to buffer water to conserve the limestone of the environmental factors that damage it.

关键词： White Monastery Limestone Deterioration Preservation Sealers

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Innovative surfactant of Gemini-type for dissolution mitigation of steel in pickling HCl medium

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Chinese Journal of Chemical Engineering 2021年第6期34卷 125-133页

作者： Medhat Kamel mohamed Hegazy Salah rashwan mohamed El Kotb Department of Chemistry Faculty of ScienceSuez Canal UniversityIsmailia 41522Egypt Egyptian Petroleum Research Institute(EPRI) Nasr CityCairo 11727Egypt

A new surfactant of Gemini-type,N,N'-((phthylbis(oxy))bis(ethane-2,1-diyl))bis(N,N-dimethyldodecan-1-aminium bromide)is prepped&*** dissolution suppression impact of the new compound on steel is performed in 1 mol·L^(-1)HCl environment by means of chemical and electrochemical *** prepared surfactant is an agreeable dissolution inhibitor for *** mitigation efficacy rises with the quantity of the *** surfactant belongs to inhibitors of *** adsorption of the synthesized compound followed the Langmuir's *** negative magnitudes of bothΔG_(ads)^(θ) andΔH^(adsθ)indicate that the adsorption process proceeds from its own accord and *** mechanism of adsorption is elucidated by scanning *** is established that the transfer resistance(R_(ct))value rose,where the value of the phase element(CPE)reduced with the amount of synthesized *** to the experimental data arrived by surface tension measurements,the prepared compound is a powerful active agent at the air/water boundary.

关键词： Innovative Gemini surfactant Synthesis Dissolution mitigation Steel Pickling HCl media

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Corrosion Behaviour of Nickel in Chloroacetic Acids and its Inhibition

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Journal of Materials Science & Technology 2004年第1期20卷 121-125页

作者： S.M.rashwan A.Emam S.M.Abd El-Wahab M.M.mohamed Chemistry Department Faculty of Science Suez Canal University Ismailia EgyptChemistry Department Faculty of Science Suez Canal University Ismailia EgyptChemistry Department Faculty of Science Ain Shams University Cairo EgyptChemistry Department Faculty of Science Suez Canal University Ismailia Egypt

Anodic dissolution behaviour of Ni in mono-, di- and trichloroacetic acids has been investigated by measuring current densities of Ni electrode (versus SCE) at different potentials. Effects of acid concentration, pH, scan rate and additive inhibitor on the potential were studied and they revealed that there is a considerable shift of potential. Potentiodynamic polarization measurements show that the corrosion rate of Ni in chloroacetic acid solutions increases by increasing the previous factors. However, by adding inhibitor, it decreases.

关键词： Corrosion Nickel Chloroacetic acids Inhibition

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THE INDOOR ENVIRONMENTAL QUALITY PERFORMANCE OF GREEN LOW-INCOME SINGLE-FAMILY HOUSING

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Journal of Green Building 2018年第2期13卷 98-120页

作者： Joshua B.Akom Abdul-Manan Sadick mohamed H.Issa Shokry rashwan Marten Duhoux Faculty of Engineering Department of Civil EngineeringUniversity of ManitobaEITC15 Gillson StreetWinnipegMB R3T 5V6 Canada School of Construction and Engineering Technologies Red River College2055 Notre Dame AveWinnipegMB R3H 0J9 Canada ft3 Architecture Landscape Interior Design 300 Waterfront DrWinnipegMB R3B 0G5 Canada

There is little empirical evidence in the literature about the indoor environmental quality performance of residential buildings in general and of social housing in particular. To address this problem, this study used a mixed-method approach to evaluate the indoor environmental quality performance of 17 green low-income single attached family houses in Brandon, Manitoba, Canada. Questionnaires were administered to occupants to assess their snapshot and long-term satisfaction with the indoor environment. In addition, snapshot measurements were carried out to evaluate the indoor environmental quality factors of thermal comfort, indoor air quality, lighting and acoustics. Occupants’ snapshot satisfaction was categorized into two groups (i.e. satisfied/comfortable or dissatisfied/uncomfortable) and compared with snapshot measurements. The results showed the measured IEQ parameters were well below recommended threshold levels. Further, occupants with higher snapshot satisfaction were generally exposed to relatively lower levels of indoor pollutants. A statistically significant difference was found in PM10 level only between the snapshot satisfied and snapshot dissatisfied groups of occupants. Apparent sound transmission classes were below the standard reference value of 50, suggesting potential problems in noise attenuation within different spaces in each apartment and between apartments. The findings of this study could help governments implement green shadowing for public-housing and also renovate existing houses using the same principles.

关键词： indoor environmental quality low-income housing social housing green houses thermal comfort indoor air quality lighting acoustics

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Effect of silica fume on the behavior of lightweight reinforced concrete beams made from crushed clay bricks

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AI in Civil Engineering 2023年第1期2卷 77-92页

作者： Yahia M.S.Ali Tarek Abdelaleem Hesham M.Diab mohamed M.M.rashwan Department of Civil Engineering Faculty of EngineeringAssiut UniversityAssiut 71516Egypt International Institute for Urban Systems Engineering Southeast UniversityNanjing 210096China

Crushed over-burnt clay bricks(COBCBs)are a promising alternative to the natural gravel aggregate in lightweight concrete(LWC)production because of their high strength-to-weight ***,COBCBs are considered a green aggregate as they solve the problem of solid waste *** this paper,a total of fifteen reinforced concrete(RC)beams were constructed and tested up to *** experimental beams were classified into five *** con-trol beams were cast with normal weight concrete(NWC),while the remaining four groups of beams were prepared from *** test parameters were the concrete type,reinforcement ratio and silica fume(SF)*** behavior of beams was evaluated in terms of the crack pattern,failure mode,ultimate deflection,and *** experimen-tal results suggested that the weight and strength of the concrete prepared satisfied the requirements of *** addition,the increase in the reinforcement ratio and SF content improved the behavior of the *** is noteworthy that the SF addition caused measurable enhancements to the majority of the performance characteristics of LWC ***,COBCBs were successfully used as coarse aggregates in the production of high-quality *** ACI 318-19 and CSA-A23.3-19 made acceptable predictions of the cracking moment,ultimate capacity and mid-span deflection.

关键词： Recycling Lightweight concrete Crushed clay bricks Silica fume

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Development of Design Response Spectra Based on Various Attenuation Relationships at Specific Location

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Journal of Civil Engineering and Architecture 2013年第12期7卷 1501-1506页

作者： Hapsa Husen Taksiah Abdul Majid Fadzli mohamed Nazri Mohd rashwan Arshad Ade Faisal Sift Khadijah Che Osmi Civil Engineering Department Faculty of Engineering Universiti Pertahanan Nasional Malaysia Kuala Lumpur 57000Malaysia School of Civil Engineering Universiti Sains Malaysia Pulau Pinang 14300 Malaysia

Peninsular Malaysia is located and lies in a low seismic region. Although Malaysia is not located in the active fault seismic area, it is closed to the Sumatran active seismic zones. Tall building are fIequently felt the tremor generated fTom Sumatran subduction and fault zones especially in the west cost of Peninsular Malaysia such as Johor Bahru, Kuala Lumpur and Penang. Existing design response spectra was developed based on attenuation relationship for each subduction and fault zone. In this study, the design response spectra were developed based on various attenuation relationships for selected location in Kuala Lumpur area, namely, Mutiara Damansara, Bandar Petaling Jaya and Bandar Puteri Puchong. The development of design response spectra based on various attenuation relationships is more reliable in selecting the appropriate attenuation relationship for the study area. Seven attenuations have been chosen and results show that Megawati et al. are the most appropriate attenuation relation for fault zone, where the predicted PGA （peak ground acceleration） is 0.0187 g which is the proposed PGA value for this study area. This study also found that most of soil in the study area can be categorized into SD （stiff soil） according to site classification in the NEHRP 2000 Provision/UBC 97. Bandar petaling Jaya was found to be highest AF （amplification factor） of 3.74 for stiff soil and Mutiara Damansara with AF of 2.67 for very dense soil or soft rock. The proposed design response spectra for each location were developed based on UBC 1997 （Uniform Building Code 1997）. The peak RSA （response spectrum acceleration） of 0.30 g for soil type SD for Bandar Petaling Jaya is the maximum level of acceleration on the soil surface with a period range of 0.10 to 0.52 seconds. All these values can be used for the seismic safety evaluation of existing structures and as a guideline in designing new structures to resist future earthquake, within the study area.

关键词： Attenuation relationship PGA (peak ground acceleration) response spectrum acceleration response spectra Sumatra subduction zone Sumatra fault zone.

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