Journal articles on the topic 'Hugh Ferriss'

The heterogeneous photo-Fenton type system has huge fame in the field of wastewater treatment due to its reusability and appreciable photoactivity within a wide pH range. This research investigates the synthesis and characterization of iron(II) doped copper ferrite (CuII(x)FeII(1-x)FeIII2O4 nanoparticles (NPs) and their photocatalytic applications for the degradation of methylene blue (MB) as a model dye. The NPs were prepared via simple co-precipitation technique and calcination. The NPs were characterized by using Raman spectroscopy, X-ray diffractometry (XRD), scanning electron microscopy (SEM), and diffuse reflectance spectroscopy (DRS). SEM reveals the structural change from the spherical-like particles into needle-like fine particles as the consequence of the increasing ratio of copper(II) in the ferrites, accompanied by the decrease of the optical band-gap energies from 2.02 to 1.25 eV. The three major determinants of heterogeneous photo-Fenton system, namely NPs concentration, hydrogen peroxide concentration and pH, on the photocatalytic degradation of MB were studied. The reusability of NPs was found to be continuously increasing during 4 cycles. It was concluded that iron(II) doped copper ferrites, due to their favorable band-gap energies and peculiar structures, exhibit a strong potential for photocatalytic-degradation of dyes, for example, MB.

Lath-shaped upper bainite structures play a very important role in many high-strength steels (HSSs) and ultra high-strength steels (UHSSs). Although bainite transformation is strongly affected by the initial structure, the effect of the second phase in a multi-phase structure is yet to be clearly understood. It is significant for the advancement of UHSS to study this effect. The aim of this study is to clarify the effect of martensite, which forms before bainite, in Fe-0.2C-8Ni alloy. The bainite transformation from an austenite and martensite dual-phase structure is faster than that from single-phase austenite and the nucleation of bainitic ferrite laths are accelerated around martensite. This effect of martensite on bainite kinetics is equivalent to that of polygonal ferrite when their volume fractions are almost the same. This suggests that the boundary between martensite and austenite is a prior nucleation site of bainitic ferrite. Martensite also affects the crystallographic features of bainite. The orientations of bainitic ferrite laths tend to belong to the same block with martensite adjacent. This tendency intensifies with an increase of the transformation temperature of bainite, resulting in the formation of huge blocks consisting of bainitic ferrite and martensite laths at high temperatures (693K and 723K). In contrast, at a low temperature (643K), bainitic ferrite laths belong to same packet as martensite and have several orientations. This change of crystallographic features with transformation temperature can explain with the driving force of the nucleation of bainitic ferrite.

AbstractNa-poor, Fe-bearing high sanidine from a lamproite near Cancarix (Spain) has 2Vα‖(010) = 37-43° and C2/m, a = 8.598(15), b = 13.050(26), c = 7.209(17) Å, β = 116.00(18)° V = 727(2) Å3. Rims of sanidine crystals against vugs contain up to 60 mole % KFeSi3O8 and up to 10 at.% Si and 6 at.% K above the stoichiometric requirement; otherwise, they have up to 4 mole % □Si4O8 and 3 mole % K2O.Si4O8 in solid solution. Their MgO content may reach 0.46 wt.%. The skeletons of mm sized blocky crystals (Baveno habit) indicate formation under moderate undercooling at temperatures not much above 725°C Feldspar formation was facilitated by a high diffusion rate due to low viscosity in a highly perpotassic melt, supersaturated by pressure release and diopside fractionation, upon extrusion of a huge volume of lava in a crater. After titanian potassium-richterite largely filled the interstices in the sanidine fabric, crystals of dalyite (K2ZrSi6O15) and Fe-rich rims of sanidine and amphibole crystals were formed from an increasingly hydrous, silicic, ferric, and peralkaline residual melt. High rate nonequilibrium crystallisation caused the incorporation of excess SiO2 and K2O in the defect structure of the sanidine. Retrograde boiling initiated the escape of volatiles, causing the quenching, by which the disordered structural state and the nonstoichiometric composition of the sanidine were preserved.

The process known as Tempcore is used to produce high resistance rods by the formation of a surface layer of quenched and tempered martensite that surrounds a core made of ferrite and pearlite. Such a mixed structure is result of processing hot rolled rods through waters headers that reduce the temperature at the surface below that for the transformation into martensite. This structure is tempered by the heat flowing from the core of the rod, which transforms into ferrite and pearlite while the rod is in the cooling beds. Such processing produces a significant increase in yield and ultimate tensile strength, while maintaining adequate ductility. The economic advantages of this process are huge in comparison with those that require alloying elements or further metal working to improve mechanical properties. A series of experimental trials were carried out in a pilot plant in which parameters such as reheating temperature, water flow and processing time were varied to study their effect on the mechanical properties of carbon steel rods and on the structures formed in the bars. The study is being complemented by the thermal modelling by the finite element method.

In this paper, JMatPro thermodynamic software, OM, SEM, TEM, and EPMA were used to study the microstructure and mechanical properties of SA738 Gr.B nuclear power steel after tempering at 630–710 °C. When tempered within the range of 630–670 °C, a huge amount of M3C and MC carbides were dispersed and precipitated in the ferrite matrix, and the strength and toughness matched well; when the tempering temperature rose above 670 °C, hard and brittle plate-martensites formed at the grain boundary, leading to the tensile strength of the experimental steel increased, while the low-temperature impact toughness significantly decreased and the yield strength also declined due to the disappearance of the finely dispersed second phase particles in the matrix.

Controlling populations of free-roaming dogs and cats poses a huge challenge worldwide. Non-surgical neutering strategies for male animals have been long pursued, but the implementation of the procedures developed has remained limited to date. As submitting the testes to high temperatures impairs spermatogenesis, the present study investigated localized application of magnetic nanoparticle hyperthermia (MNH) to the testicles as a potential non-surgical sterilization method for animals. An intratesticular injection of a magnetic fluid composed of manganese-ferrite nanoparticles functionalized with citrate was administered followed by testicle exposure to an alternate magnetic field to generate localized heat. Testicular MNH was highly effective, causing progressive seminiferous tubule degeneration followed by substitution of the parenchyma with stromal tissue and gonadal atrophy, suggesting an irreversible process with few side effects to general animal health.

In the past significant effort has been obtained on the miniaturization of electronic devices, for example in the field of cellular phones or other portables devices. Mainspring of this process is the huge success that has been obtained with giant integration densities on chip level. In contrast passive components are actually the most important bottlenecks in the upcoming miniaturization process, first of all for applications in power electronics. Especially in the field of electric mobility and innovative lighting technologies an increasing demand arises for miniaturized transformers and converters. Miniaturization of power electronic devices concentrates however the dissipation heat in a smaller volume, leading in most cases to higher operation temperatures. LTCC (Low-Temperature-Cofiring-Ceramic) as a ceramic multilayer interconnection technology has been employed for the development of 3D-high integrated electronic modules, marked by an excellent thermal robustness. Actual integration of inductors or capacitors in LTCC-boards is restricted to SMD's, limiting further miniaturization in an important manner. Hence the monolithic integration of inductors and capacitors into ceramic multilayer circuit boards is a straightforward approach to gain higher integration levels in power electronics. We report on the preparation and processing of low sintering materials for the implementation of ferrite cores into LTCC multilayer boards. Different semi-finished products based on ferrite powders have been elaborated. Sintering behavior of these materials has been studied and material compatibility with different standard LTCC materials was tested.

Scaling exists commonly and its harm is huge. Because of this, design an amplitude-modulating electromagnetic field generator. The drive signal is obtained by amplitude modulation and power amplification. Generate two sine signals by the wien bridge and make the two signals through the MC1496 multiplier, the carrier’s amplitude changes with the modulator’s rule. And the frequency of carrier and modulator could be changed with the adjustment of the Oscillation resistance. Then, make use of D class amplifier TDA8920BTH to enlarge the power of modulated signal. At last, load the drive signal on a ferrite of magnetic coil to gain an electromagnetic field whose strength is modulated. Differ from the ordinary form of winding pipe with wire line, this design is making the magnetic coil close to a pipe. That’s more convenient for installing and removing. Of course, the concrete effect of descaling is needed to test by further experiments.

AbstractDuplex stainless steels (DSS) may be defined as a category of steels with a two-phase ferritic–austenitic microstructure, which combines good mechanical and corrosion properties. However, these steels can undergo significant microstructural modification as a consequence of either thermo-mechanical treatments (ferrite decomposition, which causes σ- and χ-phase formation and nitride precipitation) or plastic deformation at room temperature [austenite transformation into strain-induced martensite (SIM)]. These secondary phases noticeably affect the properties of DSS, and therefore are of huge industrial interest. In the present work, SIM formation was investigated in a 2101 lean DSS. The material was subjected to cold rolling at various degrees of deformation (from 10 to 80% thickness reduction) and the microstructure developed after plastic deformation was investigated by electron backscattered diffraction, X-ray diffraction measurements, and hardness and magnetic tests. It was observed that SIM formed as a consequence of deformations higher than ~20% and residual austenite was still observed at 80% of thickness reduction. Furthermore, a direct relationship was found between microstructure and magnetic properties.

Camel, rabbit, cat, ferrets, minks, koala and meadow moles are induced ovulators requiring copulation to trigger the ovulatory process and the estrous cycle differs from that of other domestic animals. The estrous cycle in these animals composed of follicular recruitment, follicular growth, follicular maturity and follicular regression phase. These animals are variously reared as companion, fur-bearing and meat animals. Among these, the camel is the most valuable and classical induced ovulator which is rear not only for milk and meat, but as work animal and contributes effectively to the welfare of people in harsh and difficult environments. As a classical induced ovulatory, camelid has cycling receptivity with distinctive estrus but requires mating in order to ovulate. The other classes of induced ovulators like cats and ferrets require both the presence of male to achieve behavioral estrus and actual copulation to ovulate. The camel has good prospects of survival as a suitable livestock for projects of sustainable agriculture and animal production under harsh desert or arid conditions. However the reproductive nature of camels presents a huge challenge to camel husbandry. The natural constraints include the long period of attaining puberty, limited breeding season, difficulties in induced ovulation, long gestation period and inter-calving intervals. Efforts to improve the reproductive efficiency of the female camel are closely related to a better understanding of the folliculogenesis or follicular wave pattern. Many investigators might not be aware of the peculiar reproductive information available about this animal species. A working knowledge of ovarian function or estrous cycle will be of immense importance to the application of assisted reproductive technologies (ARTs) and enhancements of reproduction in camelids. This work presents the overview of estrous cycle in camel as a classical example of induced ovulators with the aim of providing current knowledge to the reader and to stimulate wider research interest in camel research and reproduction.

High-frequency vibrations resulting from many factors under loads existing in the wheel-rail system have a huge impact on the structure and properties of rail steel: there are signifi contact stresses in the surface layer that affect strength characteristics and overall fatigue of the railway track structure. Such an impact results, in particular, in the formation of the so-called White Layer (WL): a hardened layer on the surface of the base material, resistant to chemical etching, and having high hardness (above 1000 HV) and brittleness.The objective of the research was to study the features of the formation mechanism, as well as the properties of the white layer formed on the metal surface using an integrated approach, namely, of destructive testing methods, electron microscopy, XRD, metallography, and microhardness measurements.The reliability of experimental studies is due to the use of standardised test methods, developed methods of destructive and non-destructive testing in the main areas, the involvement of an accredited and certified laboratory, which makes it possible to fulfill in full the tasks set with appropriate quality.The results of the research allowed to present an analysis of the white layer, the formation of which took place in high-carbon M76 rail steel after cyclic tests with a 20 kHz frequency. The morphology, phase composition, and microhardness of these inclusions have been studied in detail in comparison with the base metal. It is shown that the white layer is highly dispersed, pearlitelike, featureless inclusions of a ferrite-cementite structure, while their microhardness is 3–4 times higher than the original steel and is of 1000–1200 HV. A possible explication of a mechanism of the formation of a white layer is suggested: crushing of ferrite and cementite, which are part of pearlite, without intermediate phase transformations.

Only recently has noise been considered in the assessment of the sustainability of port infrastructures, after decades of unawareness. INTERREG Maritime projects unveiled problems that have been neglected so far, such as the lack of proper regulation and noise exposure assessments for citizens. While it is true that a port area includes a huge variety of possible noise sources, very few of them have been characterized from an acoustical point of view. INTERREG projects have boosted research in the field, and previous studies have dealt with noise produced by moving ships in ports. The present work starts from a previous measurement campaign used to obtain broadband and 1/3-octave-band noise emissions of moving ships, and it aims to explain their uncertainties. More than a month’s worth of continuous acoustic measurements and video recordings were deeply analyzed in order to obtain an input database that is as precise as possible. A multiple regression analysis was performed in order to understand the influence that parameters such as minimum distance, speed, and draught have on ships’ noise emissions, which were calculated using pass-by measurements, with a special focus on ferries. The minimum distance of each ship’s passage from the microphone was measured using a video recording with an innovative methodology, providing results with 3 m of uncertainty. Knowing which parameter is more influential would help in planning proper measurements for monitoring or for drafting correct guidelines. Draught was determined to be uninfluential in ferries’ noise emissions, while the minimum distance and speed relations were estimated and accounted for in the calculation of a refined sound power level. From a spectrum point of view, the frequencies from 500 Hz to 2.5 kHz were determined to be those that contributed the most to the noise produced by the transit of a ship, and they vary with speed. With the studied corrections, different ferry models resulted in similar noise emissions. The standard deviation of noise emitted was reduced by 0.5 dB (A), and the average was also improved by positioning the ships’ flow at the correct average minimum distance. Furthermore, the right placement of a source is also important in the acoustic mapping phase for a correct evaluation of the propagation of noise at a distance. The use of more precise input data is important for improving the output of acoustic propagation models during the assessment of port noise in the surrounding areas.

The effects of thermal simulation on the short-term creep fracture of modified 91 (mod. 91) weld metal (WM) were evaluated at elevated temperature. The reheated zones in the WM during multiple passes were simulated by an infrared heater. The simulated WM specimens after post-weld tempering at 1023 K/2 h were loaded with dead weight either at 903 K/120 MPa or 933 K/80 MPa. In this work, the simulated WM specimens after tempering were loaded either at 903 and 933 K during the tests. The loss in creep lives of various specimens at elevated temperature was determined accordingly and further compared with the Gr. 91 steel base metals, which were normalized either at 1213 K or 1333 K and then tempered at 1033 K for 2 h. The coarse, solidified structure of the WM had much better creep resistance than the base metal even that of the base metal normalized at 1333 K. However, the imposed welding thermal cycles would cause a significant decrease in creep resistance of the WM. Creep lives were shortened obviously in the simulated WM samples, especially in the simulated sample that underwent partial transformation. The combination of a fine-grained structure and soft ferrite present in the simulated WM was responsible for their huge decline in creep resistance, as compared with the WM in the as-tempered condition.

The polymeric graphitic carbon nitride (g-C3N4) has been one of the interesting earth abundant elements. Though g-C3N4 finds application as a photocatalyst, its photocatalytic behaviour is limited because of low efficiency, mainly due to rapid charge recombination. To overcome this problem, several strategies have been developed including doping of metal/non-metal in the cavity of g-C3N4. Moreover, the CoFe2O4 NPs have been used in many organic transformations because of its high surface area and easy separation due to its magnetic nature. This review describes the role of cobalt ferrite as magnetic nanoparticles and metal-doped carbon nitride as efficient heterogeneous catalysts for new carbon-carbon and carbon-hetero atom bond formation followed by heterocyclization. Reactions which involved new catalysts for selective activation of readily available substrates has been reported herein. Since nanoparticles enhance the reactivity of catalyst due to higher catalytic area, they have been employed in various reactions such as addition reaction, C-H activation reaction, coupling reaction, cyclo-addition reaction, multi-component reaction, ring-opening reaction, oxidation reaction and reduction reactions etc. The driving force for choosing this topic is based-on huge number of good publications including different types of spinels/metal doped-/graphitic carbon nitride reported in the literature and due to interest of synthetic community in recent years. This review certainly will represent the present status in organic transformation and for exploring further their catalytic efficiency to new organic transformations involving C-H activation reaction through coupling, cyclo-addition, multi-component, ring-opening, oxidation and reduction reactions.

The study of magnetic nanoparticles (MNPs) is an emergent field of science in this era due to their widespread utilization in the various fields of biomedical science. Developing concerns of magnetic nanoparticles in the researcher’s field led to design a huge number of MNPs including individual or binary metallic particles, oxides, (ferrites), biopolymer coated composites, metallic carbides and graphene mediated nanoparticles. Numerous synthetic routes are defined in literature to attain the desired size, crystal structure, morphology and magnetic properties. To build up biocompatibility, MNPs subjected to surface treatments by coating with some suitable organic or inorganic biomaterials which not only improves its physical characteristics but also elevate its chemical stability. These biomaterials coat either isolatly or in a combined state to enhance the colloidal stability, magnetic properties as well as prevent it cytotoxicity and surface corrosion in the biological media. These properties are essential for the particles and empowering their effectiveness in various biomedical science i.e., drug delivery Magnetic resonance imaging (MRI), hyperthermia, biosensors and gene therapy etc. Current review recapitulates the verdicts of previous research on the subject of magnetic nanoparticles. It will also explain the recent advancements of biomaterials that execute a dynamic role in various medical treatments. Our main focus is to report the particle types, design and properties as well as discussing various synthetic routes including sol gel, co-precipitation, microemulsion, green synthesis, sonochemical method and polyol synthesis etc. These methods produced particles of excellent yield with unique magnetic properties, coercivity and crystallinity and enhanced biocompatibility as compared to traditional methods used to develop MNPs.

<P>Background: In recent years, green organic transformation has become a challenge for a chemist in areas like social sector, health, and environment. Literature survey revealed that a nano magnetite supported heterogeneous catalysis is an emergent field with huge application in chemical synthesis. </P><P> Objective: In the present article, the aim was to develop a simple and facile method to carry organic reaction under benign media. So, the focus was on the synthesis of nano-magnetite supported molybdenum catalyst and its application in β-enaminones synthesis. </P><P> Methods: Magnetically recyclable heterogeneous ferrite-molybdenum catalyst was prepared by simple impregnation method. The synthesized nanocatalyst Fe-Mo was well analysed by spectroscopic techniques like X-ray diffraction analysis, X-ray photoelectron spectroscopy, transmission electron microscopy, field-emission gun scanning electron microscopy and vibrating-sample magnetometry. The functionalized nanocatalyst Fe-Mo was employed in the synthesis of β-enaminones under solvent free condition. </P><P> Results: The competency of synthesized nanocatalyst-Fe-Mo was observed to be good for the synthesis of β-enaminones derivatives under microwave irradiation and gave excellent yield (86-96%) of the product. The catalyst was recycled for more than five consecutive runs without significant loss in its activity. </P><P> Conclusion: In the present research article, synthesis of highly active, magnetically recyclable Fe- Mo nanocatalyst was obtained from easily available precursor. The MNP was stable under investigated conditions and effective in β-enaminones synthesis. The simple eco-friendly method, low catalyst loading, short transformation time, and reusability of the catalyst thoroughly follow the sustainable protocol.</P>

Fulfilment of energy in various sectors of society is the demand of today’s world. Nowadays, researchers are working hard to propose such technologies to eradicate energy losses. Several improvements have been presented by the research community in this regard. After their struggle and hard work, researchers believed that this energy crisis could be overcome with the aid of fluids. So a procedure is executed to subject the fluid flows to a magnetic field. Furthermore, they also disclosed that induction of ferro-elements in a fluid under the existence of magnetic fields, known as ferrofluid, is a remarkable technique to overcome this huge social, economic, and technological problem. So the motto of the current literature is to investigate the elevated thermophysical features of viscous fluid by the inclusion of ferro-particles. To achieve said purpose, nickel zinc ferrite particles (NiZnFe2O4) are added to ethyl alcohol (C2H5OH) in the presence of magnetic dipole. Flow is induced by a two-dimensional linearly elongated sheet. The governing momentum, energy, and thermal transport equations describing the thermomechanical aspects of ferrofluid is modelled in the form of partial differential expressions. Similar variables are needed to transfer the coupled partial expressions into ordinary differential system. Extensive computational interpretation of influencing parameters like ferromagnetic interaction parameter, viscous dissipation, and Curie temperature parameter on associated profiles is accomplished using the shooting method in collaboration with the Runge–Kutta–Fehlberg method. It is found that the primary function of the magnetic dipole is to reduce the velocity within the boundary layer and it tends to enrich the thermal attitude. Diminishing of the momentum distribution of ferro-particles is established in the presence of a magnetic dipole. Inclusion of mixed convection decreases the momentum, whereas an increase is induced in the thermal profile. Decrease of convective heat transfer magnitude is observed in the presence of magnetic dipole.

There have been accounts of repeated failure of crane hooks at the coil yard of a Hot Strip Mill which pose a serious threat to safety in the area. More than 4 hooks failed in less than 5 years. The crane hook (rated for 36000 kg) failed from the threaded shank while lifting a load of 18143 kg. The metal in the hook was revealed by chemical analysis to be killed IS: 4367 20C15 steel. The hook rod failed from a step where there was a cross sectional change and the locations were associated with machining and chatter marks. Such cross-sectional changes are the potential sites of stress concentrations leading to crack initiations. Fracture surfaces of broken pieces of hook reveal initiation of beach marks from both sides with granular rough surface at the middle of fracture zone. Beach marks initiated from both sides indicate origin of reverse bending fatigue. Distinct granular rough zone at the middle is due to final brittle fracture. Microstructure of the polished sample revealed numerous inclusions which indicate that the steel was not clean .Such a huge number of inclusions are not desirable as they can act as stress concentration sites and lead to fatigue crack initiation. Etched microstructure of failed hook reveals coarse cast structure having inhomogeneous microstructure with a mixture of ferrite and pearlite (which meant lower fatigue strength). This inhomogeneous coarser cast structure is outcome of lower reduction ratio during rolling followed by improper heat treatment process. The fracture was concluded to have occurred due to stress concentration from the step region due to inferior material (Inclusion and Improper Heat treatment process). Preventive maintenance and condition monitoring procedures should be applied to identify and minimize the risk(s) Establishment of an NDT procedure for regular basis inspection of the structural members (welded joints and hookshaped steel rods during incoming inspection and in-service).

Abstract STUDY QUESTION Can severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) mRNA be detected in the reproductive tract of asymptomatic patients undergoing ART? SUMMARY ANSWER SARS-CoV-2 mRNA is not detectable in semen, follicular fluid, vaginal secretions or residual medulla from ovarian tissue cryopreservation procedures in asymptomatic patients who undergo ART, irrespective of the results of a triage questionnaire and a nasopharyngeal SARS-CoV-2 RNA detection test. WHAT IS KNOWN ALREADY The SARS-CoV-2 pandemic had a huge impact on the activities of fertility clinics. Although some studies reported the presence of SARS-CoV-2 mRNA in the reproductive system during or after acute COVID-19 symptomatic infections, uncertainties remain regarding the presence of viral mRNA in the reproductive material and follicular fluid of asymptomatic patients undergoing ART. STUDY DESIGN, SIZE, DURATION An observational cohort trial of residual material samples including semen, follicular fluid, vaginal secretions and ovarian medulla was conducted during the second pandemic wave in Brussels from September 2020 to April 2021. PARTICIPANTS/MATERIALS, SETTING, METHODS All patients who underwent ART (IUI, IVF/ICSI, oocyte and ovarian tissue cryopreservation) responded to a triage questionnaire at the beginning and end of the cycle and underwent nasopharyngeal swab collection for SARS-CoV-2 RNA detection by RT-PCR before the procedure according to standard recommendations. For semen analysis, only the questionnaire was requested the day before the sample collection. The ART cycles of patients with positive nasopharyngeal SARS-CoV-2 RNA detection tests and/or questionnaires were cancelled except for those that could not be postponed. After providing informed consent, swabs on residual materials were collected the day of the oocyte, ovarian tissue or semen collection and were processed for RT-qPCR. MAIN RESULTS AND THE ROLE OF CHANCE A total of 394 samples from 291 patients were analysed. Amongst them, 20 samples were obtained from patients with a positive questionnaire but negative nasopharyngeal SARS-CoV-2 test and 20 others were from patients with a positive nasopharyngeal SARS-CoV-2 test. The remaining samples were collected from patients with a negative or unknown nasopharyngeal SARS-CoV-2 test and/or a negative or unknown triage questionnaire. Viral RNA for SARS-CoV-2 was undetectable in all of the samples. LIMITATIONS, REASONS FOR CAUTION Considering the cancellation policy, only a limited number of samples from patients with positive triage questionnaires or nasopharyngeal SARS-CoV-2 tests were included in the analysis. WIDER IMPLICATIONS OF THE FINDINGS The study suggested that there was no risk of reproductive tract contamination by SARS-CoV-2 in asymptomatic patients, irrespective of the results from a triage questionnaire or nasopharyngeal SARS-CoV-2 test. The results suggested that no additional measures to prevent staff or cross-patient contamination need to be implemented in the IVF and andrology laboratories. STUDY FUNDING/COMPETING INTEREST(S) This study was funded by the Université Libre de Bruxelles and by a grant from Ferring. A.D. and I.D. received a grant from Ferring for the study. The authors have no other conflict of interest to declare related to this study. TRIAL REGISTRATION NUMBER N/A.

ABSTRACTIn the recent time spinel ferrite magnetic nanoparticles have been largely studied owing to various applications of these materials in the information storage, ferro-fluid technology, magnetocaloric effect, refrigeration and medical diagnostics. In this category cobalt ferrite (CoFe2O4) nanoparticles specifically gained huge research attention and prepared by various chemical methods. However, further investigations are still needed on the substituted CoFe2O4 (CFO) nanoparticles to explore their various characteristics. In this paper we present our results on Mn and Zn substituted cobalt ferrite (Co0.6Zn0.4Mn0.3Fe1.7O4 ) nanoparticles prepared by chemical co precipitation method. The x ray diffraction pattern of as prepared Co0.6Zn0.4Mn0.3Fe1.7O4 (CZFMO) nanoparticles indicated their average particle size =20 nm. Magnetic properties of these nanoparticles before and after thermal annealing have been compared. Magnetization (M) vs. field (H) loop measurements at T = 293 K on as prepared and thermally annealed CZFMO nano powders revealed an unusual feature contrary to CFO nanoparticles prepared under same conditions. The saturation magnetization (Ms) decreases after the thermal annealing unlike the usual increase in Ms observed for CFO nanoparticles. These nano sized CZFMO powder samples are further characterized by low temperature magnetic measurements; Raman spectroscopy and Fourier transform infrared spectroscopy.

Duplex stainless steel (DSS) is an important material used for corrosion resistance in various harsh environment plants such as petrochemical, offshore subsea component, and other chemical industries. An approximately equal amount of austenite and ferrite (A/F) ratio grants good mechanical properties and rust protection on. The detrimental intermetallic phase frequently occurs due to an unbalanced A/F ratio caused by the welding’s thermal cycle. Backing gas is commonly applicable in the field combined Gas Tungsten Arc Welding (GTAW) process. However, the use of backing gas to complete a single weld from root to cap joint required huge additional costs for consumables. Maintaining the thermal cycle in the welding parameter and GTAW process with ER2209 filler metal for DSS below 10 mm thick can reduce the backing gas sequence. The research aims to efficiently substitute full backing gas consumption, which meets a desirable quality in terms of corrosion resistance. The effect of backing gas reduction was studied. All specimens were tested by visua Vickers microhardness, metallography, ferrite content measurement, and electrochemical corrosion test. The visual test shows no defects beyond the range of the ASME IX acceptance and criteria. The evaluation comes from the ferrite scope and electrochemical corrosion test. The backing gas on the root weld shows a balance A/F ratio of around 38% ferrite content accepted in various standards. The backing gas sequence on the root until filler-pass obtained 0.04 mm/year, which is the desirable corrosion resistance and met the requirement of ASTM A932.

Fallujah pontoon bridges were not merely crossings installed to join the west and east banks of the Euphrates River, they also represented a vital link in the land transport network that connected Iraq to the outside world in the eastern Mediterranean and beyond. With the growth of Fallujah’s economic role on the international commercial map in the late 15th and early 16th centuries, the pontoon bridges gained a huge commercial and military significance (demonstrated by the Ottomans’ repeated attempts to install such pontoon bridges along the Euphrates banks near Fallujah). The local authorities in Iraq regulated the toll tax imposed on crossing bridges and using ferries in Fallujah. However, toll tax regulation was considerably developed under the Hashemite monarchy. This is the key focus of this paper, which evaluates the development of the toll tax regulations, investigating unpublished official documents produced during the Hashemite monarchy. Keywords: Fallujah, Modern History, Pontoon bridges, Toll tax regulation.

Abstract Corrosion of steel rebars and susceptibility of reinforcement steel to chloride ion attacks are the two major problems for the construction industries and thereby a huge amount of money is spent to repair it. Epoxy coating on the steel rebars can be one cost-effective solution to alleviate the detrimental effects of corrosion in concrete structures. In the present research, plain and epoxy coated rebar (ECR) samples were chosen to study the correlation between microstructure, hardness and corrosion performance. The microstructures of the investigated thermomechanically treated (TMT) rebars primarily reveal tempered martensitic rings at the outer surface followed by a narrow bainitic transition zone in between along with a ferrite-pearlite microstructure at the inner core. The corrosion resistance of plain and epoxy-coated rebars in naturally aerated 3.5% NaCl and 1% HCl solutions were studied using gravimetric test, open circuit potential (OCP) test, and linear polarization monitoring techniques. It has been witnessed that the corrosion current (icorr) has been shifted towards lower values and polarization resistance (Rp) values are higher for ECR samples which is a clear indication of higher corrosion resistance of the ECRs than the plain rebars. Energy dispersive spectroscopy (EDS) analysis reveals the presence of iron hydroxides and iron oxides. However, X-Ray diffraction (XRD) analysis indicates the existence of various types of oxides, hydroxides, and oxy-hydroxides like iron chloride hydroxide [Fe2(OH)3Cl], goethite (α-FeO(OH)), lepidocrocite (γ-FeO(OH)), magnetite (Fe3O4) and bernalite [Fe(OH)3(H2O)0.25] in the epoxy coated rebar samples whereas, plain rebars indicate the presence of goethite (α-FeO(OH)), maghemite (γ-Fe2O3), magnetite (Fe3O4), hydrogoethite (Fe2O3.H2O), lepidocrocite (γ-FeO(OH)) and iron oxide (Fe21.34O32). All the experimental results confirm that ECR samples are more corrosion resistant under both acidic and saline environments.

IntroductionThis paper addresses two separate notions of embodiment – western maternal embodiment and art making as a form of embodied critical resistance. It takes as its subject breeder; my unpublished five minute video installation from 2012, which synthesises these two separate conceptual framings of embodiment as a means to visually and conceptually rupture dominant ideologies surrounding Australian motherhood. Emerging from a paradoxical landscape of fear, loathing and desire, breeder is my dark satirical take on ambivalent myths surrounding suburban Australian motherhood. Portraying my white, heavily pregnant body breeding, cooking and consuming pink, sugar-coated butterflies, breeder renders literal the Australian mother as both idealised nation-builder and vilified, self-indulgent abuser. A feminine reification of Goya’s Saturn Devouring His Children, breeder attempts to make visible my own grapplings with maternal ambivalence, to complicate even further, the already strained position of motherhood within the Australian cultural imaginary. Employing the mediums of video and performance to visually manifest an ambivalent protagonist who displays both nurturing maternal ideals and murderous inclinations, breeder pushes contradictory maternal expectations to their breaking point and challengingly offers the following proposition: “This is what you want; but what you’ll get is so much more than you bargained for” (Grosz 136). Drawing upon critical, feminist theorising that challenges idealised views of motherhood; accounts of motherhood by mothers themselves; as well as my own personal grapplings with maternal expectations, this paper weaves reflexive writing with textual analysis to explore how an art-based methodology of embodied critical resistance can problematise representations of motherhood within Australia. By visualising the disjuncture between dominant representations of motherhood that have saturated Australian mainstream media since the late 1990s and the complex ambivalent reality of some women’s actual experiences of mothering, this paper discusses how breeder’s intimate portrayal of maternal domesticity at the limits of tolerability, critically resists socially acceptable mothering practices by satirising the cultural construct of motherhood as a means “to use it, deform it, and make it groan and protest” (Nietzsche qtd. in Gutting).Contradictory Maternal KnowledgeImages of motherhood are all around us; communicating ideals and stereotypes that tell us how mothers should feel, think and act. But these images and the concepts of motherhood that underpin them are full of contradictions. Cultural representations of the idealised and sometimes “yummy mummy” - middle class, attractive, healthy, sexy and heterosexual – (see Fraser; Johnson), contrast with depictions of “bad” mothers, leading to motherhood being simultaneously idealised and demonised within the popular press (Bullen et al.; McRobbie, Top Girls; McRobbie, In the Aftermath; McRobbie, Reflections on Feminism; Walkerdine et al.). Mothers own accounts of motherhood reflect these unsettling contradictions (Miller; Thomson et al.; Wilkinson). Claiming the maternal experience is both “heaven and hell” due to the daily experience of irreconcilable and contradictory feelings (Coward), mothers (myself included), silently struggle between feelings of extreme love and opposing feelings of failure, despair and hate as we get caught up in trying to achieve a set of ideals that promulgate standards of perfection that are beyond our reach. Surrounded by images of motherhood that do not resonate with the contradictory nature of the lived maternal experience, mothers are “torn in two” as we desperately try to reconcile or find absolution for maternal emotions that dominant cultural representations of motherhood render unacceptable. According to Roszika Parker, this complicated and contradictory experience where a mother has both loving and hating feelings for her child is that of maternal ambivalence; a form of exquisite suffering that oscillates between the overwhelming affect of blissful gratification and the raw edges of bitter resentment (Parker 1). As Parker states, maternal ambivalence refers to:Those fleeting (or not so fleeting) feelings of hatred for a child that can grip a mother, the moment of recoil from a much loved body, the desire to abandon, to smash the untouched plate of food in a toddler’s face, to yank a child’s arm while crossing the road, scrub too hard with a face cloth, change the lock on an adolescent or the fantasy of hurling a howling baby out of the window (5).However, it is not only feelings of hatred that stir up ambivalence in the mother, so too can the overwhelming intensity of love itself render the rush of ambivalence so surprising and so painful. Commenting on the extreme contradictory emotions that fill a mother and how not only excessive hatred, but excessive love can turn dangerously fatal, Parker turns to Simone De Beauvoir’s idea of “carnal plenitude”; that is, where the child elicits from the mother, the emotion of domination; where the child becomes the “other” who is both prey and double (30). For Parker, De Beauvoir’s “carnal plenitude” is imaged by mothers in a myriad of ways, from a desire to gobble up the child, to feelings of wanting to gather the child into a fatal smothering hug. Commenting on her own unsettling love/hate relationship with her child, Adrienne Rich describes her experiences of maternal ambivalences as “the murderous alternation between bitter resentment and raw-edged nerves and blissful gratification and tenderness” (363). Unable to come to terms with this paradox at the core of the unfolding process of motherhood, our culture defends itself against this illogical ambivalence in the mother by separating the good nurturing mother from the bad neglectful mother in an attempt to deny the fact that they are one and the same. Resulting in a culture that either denigrates or idealises mothers, we are constantly presented with images of the good perfect nurturing mother and her murderous alter ego; the bad fatal mother who neglects and smothers. This means that how a mother feels about mothering or the meaning it has for her, is heavily determined by cultural representations of motherhood. Arguing for a creative transformation of the maternal that breaches the mutual exclusivities that separate motherhood, I am called to action by Susan Rubin Suleiman, who writes (quoting psychoanalyst Helene Deutsch): “Mothers don’t write, they are written” (Suleiman 5). As a visual attempt to negotiate, translate and thus “write” my lived experience of Australian motherhood, breeder gives voice to the raw material of contradictory (and often taboo experiences) surrounding maternal embodiment and subjectivity. Hijacking and redeploying contradictory understandings and representations of Australian motherhood to push maternal ideals to their breaking point, breeder seeks to create a kind of “mother trouble” that challenges the disjuncture between dominant social constructions of motherhood designed to keep us assigned to our proper place. Viscerally embracing the reality that much of life with small children revolves around loss of control and disintegration of physical boundaries, breeder visually explores the complex and contradictory performances surrounding lived experiences of mothering within Australia to complicate even further the already strained position of western maternal embodiment.Situated Maternal KnowledgeOver the last decade and a half, women’s bodies and their capacity to reproduce have become centre stage in the unfolding drama of Australian economic policy. In 1999 fears surrounding dwindling birth-rates and less future tax revenue, led then Victorian Premier Jeff Kennett to address a number of exclusive private girls’ schools. Making Australia-wide headlines, Kennett urged these affluent young women to abandon their desire for a university degree and instead invited them to consider motherhood as the ultimate career choice (Dever). In 2004, John Howard’s Liberal government made headlines as they announced the new maternity allowance; a $3000 lump-sum financial incentive for women to leave work and have babies. Ending this announcement by urging the assembled gathering of mostly male reporters to go home and have “one for the Dad, one for the Mum and one for the Country” (Baird and Cutcher 103), Federal Treasurer Peter Costello made a last ditch effort to save Baby Boomers from their imminent pensionless doom. Failing to come to terms with the impending saturation of the retirement market without the appropriate tax payer support, the Liberal Government turned baby-making into the ultimate Patriotic act as they saw in women bodies, the key to prevent Australia’s looming economic crisis. However, not all women’s bodies were considered up to the job of producing the longed for “Good tax-paying Citizen” (Tyler). Kennett only visited exclusive private girls’ schools (Ferrier), headhunting only the highest calibre of affluent breeders. Blue-collar inter-mingling was to be adamantly discouraged. Costello’s 2004 “baby bonus” catch-cry not only caused international ire, but also implicitly relegated the duty of child-bearing patriotism to a normalised heterosexual, nuclear family milieu. Unwed or lesbian mothers need not apply. Finally, as government spokespeople repeatedly proclaimed that the new maternity allowance was not income tested, this suggested that the target nation-builder breeder demographic was the higher than average income earner. Let’s get it straight people – only highly skilled, high IQ’s, heterosexual, wedded, young, white women were required in this exclusive breeding program (see Allen and Osgood; Skeggs; Tyler). And if the point hadn’t already been made perfectly clear, newspaper tabloids, talkback radio and current affairs programs all over the country were recruited to make sure the public knew exactly what type of mother Australia was looking for. Out of control young, jobless single mothers hit the headlines as fears abounded that they were breeding into oblivion. An inherently selfish and narcissistic lot, you could be forgiven for thinking that Australia was running rampant with so-called bogan single mothers, who left their babies trapped in hot airless cars in casino carparks all over the country as they spent their multiple “baby bonus’” on booze, ciggies, LCD’s and gambling (see Milne; O’Connor; Simpson and Dowling). Sucking the economy dry as they leeched good tax-payer dollars from Centrelink, these undesirables were the mothers Australia neither needed nor wanted. Producing offspring relegated to the category of bludgerhood before they could even crawl, these mothers became the punching bag for the Australian cultural imaginary as newspaper headlines screamed “Thou Shalt Not Breed” (Gordon). Seen as the embodiment of horror regarding the ever out-of-control nature of women’s bodies, these undesirable mothers materialised out of a socio-political landscape that although idealised women’s bodies as Australia’s economic saviour, also feared their inability to be managed and contained. Hoarding their capacity to reproduce for their own selfish narcissistic desires, these white trash mothers became the horror par excellence within the Australian cultural imaginary as they were publically regarded as the vilified evil alter-ego of the good, respectable white affluent young mother Australian policy makers were after. Forums all over the country were inundated. “Yes,” the dominant voices seemed to proclaim: “We want to build our population. We need more tax-paying citizens. But we only want white, self-less, nurturing, affluent mothers. We want women who can breed us moral upstanding subjects. We do not want lazy good for nothing moochers.” Emerging from this paradoxical maternal landscape of fear, loathing and desire, breeder is a visual and performative manifestation of my own inability to come to terms with the idealisation and denigration of motherhood within Australia. Involving a profound recognition that the personal is still the political, I not only attempt to visually trace the relationship between popular Australian cultural formations and individual experiences, but also to visually “write” my own embodied grapplings with maternal ambivalence. Following the premise that “critique without resistance is empty and resistance without critique is blind” (Hoy 6), I find art practice to be a critically situated and embodied act that can openly resist the power of dominant ideologies by highlighting maternal corporeal transgressions. A creative destablising action, I utilise the mediums of video and performance within breeder to explore personal, historical and culturally situated expectations of motherhood within Australia as a means to subvert dominant ideologies of motherhood within the Australian cultural imaginary. Performing Maternal KnowledgeReworking Goya’s Romantic Gothic vision of fatherhood in Saturn Devouring His Children, breeder is a five minute two-screen video performance that puts an ironic twist to the “good” and “bad” myths of Australian motherhood. Depicting myself as the young white heavily pregnant protagonist breeding monarch butterflies in my suburban backyard, sugar-coating, cooking and then eating them, breeder uses an exaggerated kitsch aesthetic to render literal the Australian mother as both idealistic nation-builder and self-indulgent abuser. Selfishly hoarding my breeding potential for myself, luxuriating and devouring my “offspring” for my own pleasure and delight rather than for the common good, breeder simultaneously defies and is complicit with motherhood expectations within the suburban Australian imaginary. Filmed in my backyard in the southern suburbs of Perth, Western Australia, breeder manifests my own maternal ambivalence and deliberately complicates the dichotomous and strained position motherhood holds in western society. Breeder is presented as a two screen video installation. The left screen is a fast-paced, brightly coloured, jump-cut narrative with a pregnant protagonist (myself). It has three main scenes or settings: garden, kitchen and terrace. The right screen is a slow-moving flow of images that shows the entire monarch butterfly breeding cycle in detail; close ups of eggs slowly turning into caterpillars, caterpillars creating cocoons and the gradual opening of wings as butterflies emerge from cocoons. All the while, the metamorphic cycle is aided by the pregnant protagonist, who cares for them until she sets them free of their breeding cage. In the left screen, apricot roses, orange trees, yellow hibiscus bushes, lush green lawns, a swimming pool and an Aussie backyard garden shed are glimpsed as the pregnant protagonist runs, jumps and sneaks up on butterflies while brandishing a red-handled butterfly net; dressed in red high heels and a white lace frock. Bunnies with pink bows jump, dogs in pink collars bark and a very young boy dressed in a navy-blue sailor suit all make cameo appearances as large monarch butterflies are collected and placed inside a child’s cherry red insect container. In a jump-cut transition, the female protagonist appears in a stark white kitchen; now dressed in a bright pink and apricot floral apron and baby-pink hair ribbon tied in a bow in her blonde ponytail. Standing behind the kitchen bench, she carefully measures sugar into a bowl. She then adds pink food colouring into the crystal white sugar, turning it into a bright pink concoction. Cracking eggs and separating them, she whisks the egg whites to form soft marshmallow peaks. Dipping a paint brush into the egg whites, she paints the fluffy mixture onto the butterflies (now dead), which are laid out on a well-used metal biscuit tray. Using her fingers to sprinkle the bright pink sugar concoction onto the butterflies, she then places them into the oven to bake and stands back with a smile. In the third and final scene, the female protagonist sits down at a table in a garden terrace in front of French-styled doors. Set for high tea with an antique floral tea pot and cup, lace table cloth and petit fours, she pours herself a cup of tea. Adding a teaspoon of sugar, she stirs and then selects a strawberry tart from a three-tiered high-tea stand that holds brightly iced cupcakes, cherry friands, tiny lemon meringue pies, sweet little strawberry tarts and pink sugar coated butterflies. Munching her way through tarts, pies, friands and cupcakes, she finally licks her lips and fuchsia tipped fingers and then carefully chooses a pink sugar coated butterfly. Close ups of her crimson coated mouth show her licking the pink sugar-crumbs from lips and fingers as she silently devours the butterfly. Leaning back in chair, she smiles, then picks up a pink leather bound book and relaxes as she begins to read herself into the afternoon. Screen fades to black. ConclusionAs a mother I am all fragmented, contradictory; full of ambivalence, love, guilt and shame. After seventeen years and five children, you would think that I would be used to this space. Instead, it is a space that I battle to come to terms with each and every day. So how to strategically negotiate engrained codes of maternity and embrace the complexities of embodied maternal knowledge? Indeed, how to speak of the difficulties and incomparable beauties of the maternal without having those variously inflected and complex experiences turn into clichés of what enduring motherhood is supposed to be? Visually and performatively grappling with my own fallout from mothering ideals and expectations where sometimes all I feel I am left with is “a monster of selfishness and intolerance” (Rich 363), breeder materialises my own experiences with maternal ambivalence and my inability to reconcile or negotiate multiple contradictory identities into a single maternal position. Ashamed of my self, my body, my obsessions, my anger, my hatred, my rage, my laughter, my sorrow and most of all my oscillation between a complete and utter desire to kill each and every one of my children and an overwhelming desire to gobble them all up, I make art work that is embedded in the grime and grittiness of my everyday life as a young mother living in the southern suburbs of Western Australia. A life that is most often mundane, sometimes sad, embarrassing, rude and occasionally heartbreaking. A life filled with such simple joy and such complicated sorrow. A life that in reality, is anything but manageable and contained. Although this is my experience, I know that I am not the only one. As an artist I engage in the embodied and critically resistant practice of sampling from my “mother” identities in order to bring out multiple, conflictive responses that provocatively encourage new ways of thinking and acknowledging embodied maternal knowledge. Although claims abound that this results in a practice that is “too personal” or “too specific” (Liss xv), I do not believe that this in fact risks reifying essentialism. Despite much feminist debate over the years regarding essentialist/social constructivist positions, I would still rather use my body as a site of embodied knowledge then rhetorically give it up. Acting as a disruption and challenge to the concepts of idealised or denigrated maternal embodiment, the images and performances of motherhood in breeder then, are more than simple acknowledgements of the reality of the good and bad mother, or acts reclaiming an identity that they taught me to despise (Cliff) or rebelling against having to be a "woman" at all. Instead, breeder is a lucid and explicit declaration of intent that politely refuses to keep every maternal body in its place.References Allen, Kim, and Jane Osgood. “Young Women Negotiating Maternal Subjectivities: The Significance of Social Class.” Studies in the Maternal. 1.2 (2009). 30 July 2012 ‹www.mamsie.bbk.ac.uk›.Almond, Barbara. The Monster Within. Berkeley: University of California Press, 2011.Baird, Marian, and Leanne Cutcher. “’One for the Father, One for the Mother and One for the Country': An Examination of the Construction of Motherhood through the Prism of Paid Maternity Leave.” Hecate 31.2 (2005): 103-113. 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