bluuebunny/crossref_metadata_2025 huggingface dataset:
Molecular Imaging with 68Ga Radio-Nanomaterials: Shedding Light on Nanoparticles
Authors: Fernández-Barahona Irene , Muñoz-Hernando María , Pellico Juan , Ruiz-Cabello Jesús , Herranz Fernando
Published: July 2018

The combination of radioisotopes and nanomaterials is creating a new library of tracers for molecular imaging, exploiting the sensitivity of nuclear imaging techniques and the size-dependent properties of nanomaterials. This new approach is expanding the range of applications, including the possibility of theranostics. Among the many different combinations, the use of 68Ga as the radioisotope in the radio-nanomaterial is particularly convenient. The physicochemical properties of this isotope allow incorporating it into many materials with great chemical flexibility. Furthermore, its production from a benchtop generator eases the preparation of the tracer. Here, we review main results from the last years in which a nanomaterial has been radiolabeled with 68Ga. In thus process, we pay attention to the use of nanomaterials for biomedical imaging in general and main properties of this radioisotope. We study the main methods to carry out such radiolabeling and the most important applications for molecular imaging.
Efficient Formulation and Implementation of Data Assimilation Methods
Authors: Nino-Ruiz Elias D. , Sandu Adrian , Cheng Haiyan
Published: July 2018

This Special Issue presents efficient formulations and implementations of sequential and variational data assimilation methods. The methods address three important issues in the context of operational data assimilation: efficient implementation of localization methods, sampling methods for approaching posterior ensembles under non-linear model errors, and adjoint-free formulations of four dimensional variational methods.
ENABLE 2017, the First European PhD and Post-Doc Symposium. Session 1: Building the Foundations of Biology: Synthetic and Cellular Research
Authors: Di Mauro Gianmarco , Dondi Ambra , Giangreco Giovanni , Hogrebe Alexander , Louer Elja , Magistrati Elisa , Mullari Meeli , Turon Gemma , Verdurmen Wouter , Xicoy Cortada Helena , Zivanovic Sanja
Published: July 2018

The European Academy for Biomedical Science (ENABLE) is an initiative funded by the European Union Horizon 2020 program involving four renowned European Research Institutes (Institute for Research in Biomedicine—IRB Barcelona, Spain; Radboud Institute for Molecular Life Sciences—RIMLS, the Netherlands; Novo Nordisk Foundation Center for Protein Research—NNF CPR, Denmark; European School of Molecular Medicine—SEMM, Italy) and an innovative science communication agency (Scienseed). With the aim of promoting biomedical science of excellence in Europe, ENABLE organizes an annual three-day international event. This gathering includes a top-level scientific symposium bringing together leading scientists, PhD students, and post-doctoral fellows; career development activities supporting the progression of young researchers and fostering discussion about opportunities beyond the bench; and outreach activities stimulating the interaction between science and society. The first European PhD and Postdoc Symposium, entitled “Breaking Down Complexity: Innovative Models and Techniques in Biomedicine”, was hosted by the vibrant city of Barcelona. The scientific program of the conference was focused on the most recent advances and applications of modern techniques and models in biomedical research and covered a wide range of topics, from synthetic biology to translational medicine. Overall, the event was a great success, with more than 200 attendees from all over Europe actively participating in the symposium by presenting their research and exchanging ideas with their peers and world-renowned scientists.
Highly Efficient Electrocatalytic Carboxylation of 1-Phenylethyl Chloride at Cu Foam Cathode
Authors: Wu La-Xia , Sun Qi-Long , Yang Man-Ping , Zhao Ying-Guo , Guan Ye-Bin , Wang Huan , Lu Jia-Xing
Published: July 2018

A simple and efficient electrocatalytic carboxylation of benzyl chloride with CO2 is described. The reaction operates under 1 atm CO2 and room temperature in an undivided cell with Cu foam cathode and Mg sacrificial anode without any additional catalyst. For the model compound 1-phenylethyl chloride, the influence of cathode material, solvent, charge, current density and temperature were investigated. Under optimized conditions, 99% yield of 2-phenylpropionic acid could be obtained. Moreover, reasonable yields were also achieved with other benzyl chlorides.
Study of Electroless Nickel Coatings on EN-GJS-500-7 Spheroidal Graphite Cast Iron
Authors: Forestier Igor , Berthomé Grégory , Wouters Yves
Published: July 2018

EN-GJS-500-7 spheroidal graphite (SG) cast iron was coated with chemical Ni-P. The kinetic study reveals that the limiting step corresponds to a classical surface process, but the morphological study shows, at short times, an imperfect Ni-P coating on the graphite spheroids. The initial Ni-P growth appears to be blocked. This problem has been solved by the application of a cathodic polarization for a few minutes as a pretreatment of the surface. It was observed after this first step that both chemical and electrochemical reduction of nickel cation and hypophosphite on the SG cast iron took place at the same time, leading to the growth of a homogeneous Ni-P scale, in particular on graphite spheroids.
An Online Measurement Method for Insulator Creepage Distance on Transmission Lines
Authors: Huang Jing , Liu Kejian , Zeng Dan , Zhang Zhijiang
Published: July 2018

Insulators play a crucial role in ensuring the normal operation of the power system, and the creepage distance is an important electrical parameter of insulators. Most available solutions focus mainly on offline measurement methods, and online measurement for insulator creepage distance on transmission lines remains a challenging task. To address this issue and to further improve the corresponding work efficiency, an online measurement method for insulator creepage distance is presented in this paper. Considering the glass material of the insulator and the long measuring distance, this method recognizes the insulator type indirectly by calculating the structural parameters of the insulators based on their geometric features, and then obtaining the creepage distance. Accordingly, a measurement system, which mainly includes an electronic total station and a camera with a telephoto lens, is designed in this paper. Moreover, this paper also proposes an error analysis model aimed at reducing the errors caused by the layout of this system. In the conducted experiments, this proposed method effectively obtains the creepage distance and the error correction model can further improve the measurement accuracy of structural parameters.
Effects of Arbuscular Mycorrhizal Fungi on the Vegetative Vigor of Ailanthus altissima (Mill.) Swingle Seedlings under Sustained Pot Limitation
Authors: Badalamenti Emilio , Ciolfi Marco , Lauteri Marco , Quatrini Paola , Mantia Tommaso La
Published: July 2018

In order to invade new ecosystems, invasive alien plants need to cope with different microbial communities. Whilst the ability to avoid antagonists is well recognized, the opportunity to establish mutualistic associations is less known, even in widespread invasive species such as Ailanthus altissima (Mill.) Swingle. We sought to evaluate whether the beneficial effects of arbuscular mycorrhizal fungi (AMF) on Ailanthus seedlings are maintained over time, under prolonged pot limitation. We compared three-month-, three-year- and four-year-old mycorrhizal seedlings grown in natural forest soil (NT) with seedlings grown in sterilized (ST) and non-mycorrhizal (NM) soils, in pots of 3.4 L (22 × 15 cm). Growth parameters and leaf traits were assessed, including carbon (δ13C) and nitrogen (δ15N) stable isotope compositions. NT seedlings showed relatively higher vigor in the early stage but, subsequently, the benefits provided by AMF were lost. Interestingly, mycorrhizal seedlings consistently showed about 2‰ δ13C enrichment, relatively to the other treatments. Negative linear relationships between leaf δ13C and N content were found. Higher photosynthesis rates and WUE are the likely causes of the early enhanced growth in mycorrhizal seedlings. The symbiotic relationship between AMF and Ailanthus could be driven by resource availability. Greater insights into such aspects could provide an improved perspective on the ecological limits of Ailanthus.
Verbal and Non-Verbal Aggression in a Swiss University Emergency Room: A Descriptive Study
Authors: Kaeser Dominic , Guerra Rebekka , Keidar Osnat , Lanz Urs , Moses Michael , Kobel Christian , Exadaktylos Aristomenis K. , Ricklin Meret E.
Published: July 2018

Workplace violence (WPV) by patients and visitors is a hazard in many emergency departments (ED), with serious consequences for both staff and patients. Patients with a migratory background seem to be prone to being involved in WPV. We therefore reviewed all reports of ED staff who experienced WPV over a 4-year period (2013–2016). We analyzed data on the reasons for the incident, the time of day, the manner of violence, the consequences, and the migratory background of the aggressor. In total, 83 cases of WPV were reported over a four-year period. The average age of the violent person was 33.1 years; in 35 cases (42.0%), aggressors were younger than 30 years old, 53 (63.8%) were male, 49 (59%) were of Swiss nationality, and 35–40% had a migratory background. The odds ratio of people originating from a low- to middle-income country versus those originating from a high-income country was 1.8. Furthermore, 45.8% of the patients arrived by ambulance (n = 38) and 19 patients (22.9%) were self-presenting. Most cases (92.8%) involved verbal aggression, but in more than half of the cases, physical assault (56.6%) was also reported. In addition, 43 (51.8%) of the events occurred during the night. Results also showed that 42 (50.6%) of patients who were involved in WPV were under the influence of alcohol and 29 (34.9%) suffered from psychiatric disorders. Security personnel and police were involved in 53 (63.9%) and 47 (56.6%) cases, respectively. Twenty patients (24.1%) were sedated and 16 (19.3%) were restrained. In 18 cases (21.7%), the psychiatrist ordered compulsory hospitalization in a psychiatric institution. Taken together, WPV is a relatively common event in our ED and persons with a migratory background are involved more often relative to their frequency of ED visits.
Exercise Training Has Contrasting Effects in Myocardial Infarction and Pressure Overload Due to Divergent Endothelial Nitric Oxide Synthase Regulation
Authors: Van Deel Elza D. , Octavia Yanti , De Waard Monique C. , De Boer Martine , Duncker Dirk J.
Published: July 2018

The beneficial effects of exercise training (EX) on cardiac pathology are well recognized. Previously, we found that the effects of EX on cardiac dysfunction in mice critically depend on the underlying etiology. EX exerted beneficial effects after myocardial infarction (MI); however, cardiac pathology following pressure overload produced by transverse aortic constriction (TAC) was aggravated by EX. In the presented study, we investigated whether the contrasting effects of EX on cardiac dysfunction can be explained by an etiology-specific response of endothelial nitric oxide (NO) synthase (eNOS) to EX, which divergently affects the balance between nitric oxide and superoxide. For this purpose, mice were exposed to eight weeks of voluntary wheel running or sedentary housing (SED), immediately after sham, MI, or TAC surgery. Left ventricular (LV) function was assessed using echocardiography and hemodynamic measurements. EX ameliorated LV dysfunction and remodeling after MI, but not following TAC, in which EX even aggravated fibrosis. Strikingly, EX attenuated superoxide levels after MI, but exacerbated NOS-dependent superoxide levels following TAC. Similarly, elevated eNOS S-glutathionylation and eNOS monomerization, which were observed in both MI and TAC, were corrected by EX in MI, but aggravated by EX after TAC. Additionally, EX reduced antioxidant activity in TAC, while it was maintained following EX in MI. In conclusion, the present study shows that EX mitigates cardiac dysfunction after MI, likely by attenuating eNOS uncoupling-mediated oxidative stress, whereas EX tends to aggravate cardiac dysfunction following TAC, likely due to exacerbating eNOS-mediated oxidative stress.
Photocatalytic Oxidation of VOCs in Gas Phase Using Capillary Microreactors with Commercial TiO2 (P25) Fillings
Authors: Fernández-Catalá Javier , Berenguer-Murcia Ángel , Cazorla-Amorós Diego
Published: July 2018

The elimination of volatile organic compounds (VOCs) at low concentration is a subject of great interest because these compounds are very harmful for the environment and human health. In this work, we have developed an easy methodology to immobilize a benchmark photocatalyst (P25) inside a capillary microreactor (Fused silica capillary with UV transparent coating) without any previous treatment. For this purpose, a dispersion of the sample (P25) in EtOH was used obtaining a packed bed configuration. We have improved the immobilization of the benchmark photocatalyst (P25) inside the capillary incorporating a surfactant (F-127) to generate porosity inside the microreactor to avoid severe pressure drops (∆P < 0.5 bar). The resulting capillaries were characterized by Scanning Electron Microscopy (SEM). These microreactors show a good performance in the abatement of propene (VOC) under flow conditions per mol of active phase (P25) due to an improved mass transfer when the photocatalyst is inside the capillary. Moreover, the prepared microreactors present a higher CO2 production rate (mole CO2/(mole P25·s)) with respect to the same TiO2 operating in a conventional reactor. The microreactor with low pressure drop is very interesting for the abatement of the VOCs since it improves the photoactivity of P25 per mol of TiO2 operating at near atmospheric pressure.
Modification of Eutectic Si in Al-Si-(Ba) Alloy by Inducing a Novel 9R Structure in Twins
Authors: Sha Xuechao , Chen Xuefei , Ning Huiyan , Xiao Lirong , Yin Dongdi , Mao Lin , Zheng Jiang , Zhou Hao
Published: July 2018

The change of twinning morphology plays an important role in the modification of Al-Si alloys, which are widely used in industrial applications. However, the interpretation of this change is still insufficient. In this work, the microstructure of twins was investigated in two kinds of Al-Si alloys with different additions of Ba using high-resolution transmission electron microscopy (HRTEM). Unlike the normal {111} twin that exists in Ba-free alloy, discontinuous twins and multiple twins were observed in the Ba-containing alloy. In addition, the 9R structure formed by the dissociation of twins was firstly observed at the turning of discontinuous twins and the intersection of multiple twins in Al-Si alloys.
Effects of Filler–Bitumen Ratio and Mineral Filler Characteristics on the Low-Temperature Performance of Bitumen Mastics
Authors: Zheng Chuanfeng , Li Ruiming , Zou Linlin , Lv Dan , Xu Yazhi
Published: July 2018

This study analyzed the effects of the filler–bitumen interaction of the content and the meso powder characteristics of the mineral filler on the low-temperature performance of bitumen mastics. Control strategies for the mineral filler content (filler–bitumen ratio (RFB)) were also determined. Panjin #90 bitumen and styrene–butadiene–styrene polymer-modified bitumen were used in the experiment. Four kinds of limestone powder were used, all of which satisfy the Chinese standard for powder particle size but exhibit different meso characteristics. Each kind of limestone powder was used to prepare bitumen mastic samples under five different RFBs. The meso voids in the unit mass (Vg) of the four kinds of mineral filler were tested on the basis of the principle of the Rigden void ratio. The fixed bitumen–free bitumen ratio in the bitumen mastic samples was determined using Vg, bitumen density, and RFB. The low-temperature cohesive strength of the bitumen mastics was used as the control index for critical failure, whereas variation rates of bending creep stiffness at low temperature were used as the control index for fatigue failure. Results showed that the effects of the filler–bitumen interaction of the content and the meso characteristics of the mineral filler are significant and such effects are determined by the fixed bitumen–free bitumen ratio. The optimal fixed bitumen–free bitumen ratio in the bitumen mastics under two low-temperature conditions (−30 °C and −10 °C) can be determined on the basis of the influence of the fixed bitumen–free bitumen ratio on the critical and the failure control indices. Moreover, RFB can be obtained through reverse calculation. The mineral filler content can therefore be precisely controlled, which is crucial for the rational use of mineral filler and for the improvement of the pavement performance of bitumen mastics at low temperatures.
The evaluation of information provided to patients about the disease and its course in hospitals
Authors: Giedrikaitė Rytė , Misevičienė Irena , Jakušovaitė Irayda
Published: July 2018

The aim of the study was to evaluate and compare patients’ and physicians’ opinions about the assurance of patients’ right to information about the disease, the results of medical examination, treatment methods and their outcomes. Material and methods. The study was performed during November 2006 – February 2007 in two counties of Lithuania. Seven hospitals were randomly selected for the study. The participants of the study were all patients who on the day of the inquiry were treated in the departments of internal diseases and surgery and all physicians who worked in these departments on that day. Patients with severe conditions and those who were newly admitted were excluded from the study. In total, 494 questionnaires were distributed, of which 366 were distributed among patients (response rate – 71.3%) and 128 among physicians (response rate – 70.3%). Results. One-half of the inquired patients (50.9%) did not know what rights they are guaranteed by the Republic of Lithuania Law on the Rights of Patients and Compensation of the Damage to Their Health. However, the majority of patients thought that they were provided information about their disease (86.1%), the results of medical examination (76.2%), the methods of treatment (74.2%), and possible positive and negative consequences (65.2%). The comparison of patients’ and physicians’ evaluation of the provided information revealed certain differences. Physicians were inclined to evaluate themselves better. More than one-half (65.5%) of physicians stated that they provided patients with information concerning the possibility for their participation in treatment-related decision-making, but patients did not participate sufficiently actively (34.5% of positive responses) in making heath-related decisions. Conclusions. Patients are not very well informed about the Republic of Lithuania Law on the Rights of Patients and Compensation of the Damage to Their Health. The majority of patients in the studied general hospitals stated that they were provided with and understood information about their disease, the results of medical examination, and treatment methods and prognosis. The study showed that only one-third of patients expressed their opinion to the physician when making treatment-related decisions, and their opinion was taken into consideration.
Surgical treatment of urinary stress incontinence nowadays
Authors: Barilienė Sonata , Aniulienė Rosita
Published: July 2018

There are various surgical methods for the treatment of female urinary stress incontinence. According to the opinion of American Association of Urologists, anterior colpoplasty is supposed to be the least effective for the long-term treatment out of four surgical treatment categories (anterior colpoplasty, suburethral sling, colposuspension, and long-needle sling). Nowadays, the open retropubic colposuspension (Burch operation) is considered the most effective and long-term treatment of the female urinary stress incontinence. A first-year postsurgical effectiveness is 85–90% for this operation. Tension-free vaginal tape (suburethral sling) operations are considered as much effective as the above-mentioned surgeries and tend to be very perspective. However, these operations require to be evaluated for their long-term systematic results.
The effect of combined treatment methods on survival and toxicity in patients with pancreatic cancer
Authors: Brasiūnienė Birutė , Juozaitytė Elona
Published: July 2018

In Lithuania, there were 476 new pancreatic cancer cases in 2005. Based on international scientific literature and the results of our retrospective studies, a prospective study has been designed. The aim of study was a prospective evaluation of the impact of two concomitant chemoradiation methods on the survival and the time to disease progression in patients diagnosed with resectable and unresectable pancreatic cancer and prospective evaluation of the safety of two concomitant chemoradiation methods for the treatment of resectable and unresectable pancreatic cancer. Material and methods. During the period of 2000–2005 at the Clinic of Oncology, Kaunas University of Medicine Hospital, we performed a prospective randomized study to analyze two concomitant chemoradiation treatment methods. The patients were stratified according to the resectability of the tumor: with resectable tumor (stage I–IVA) and with unresectable tumor (stage III–IVA). Treatment for each group of patients was selected randomly choosing concomitant chemoradiation treatment: radiation therapy and 5-fluorouracil or radiation therapy and gemcitabine. Criteria of the efficacy of the treatment methods were median survival, time to disease progression, and treatment safety (qualitative and quantitative analysis). Results and conclusions. The treatment methods – radiotherapy and 5-fluorouracil or radiotherapy and gemcitabine – were equally effective when assessing the survival and time to disease progression in patients diagnosed with pancreatic cancer. Treatment of patients diagnosed with pancreatic cancer with radiotherapy and 5-fluorouracil was a safer approach than treatment with radiotherapy and gemcitabine, which induced more severe toxic adverse effects.
Comparison of postoperative results after implantation of hydrophilic acrylic or hydrophobic acrylic intraocular lens: Data of one-year prospective clinical study
Authors: Žemaitienė Reda , Špečkauskas Martynas , Glebauskienė Brigita , Jašinskas Vytautas
Published: July 2018

Objective. To evaluate and compare the impact of two sharp-edge optic foldable intraocular lenses (IOLs) of similar design made from different material (hydrophilic acrylic or hydrophobic acrylic) on visual function, anterior and posterior capsule opacification at one-year follow-up after cataract phacoemulsification. Material and methods. Seventy-two eyes of 72 patients scheduled for cataract surgery were included in a prospective clinical study. Two foldable sharp-edge optic posterior chamber acrylic IOLs of similar design were used. Thirty-nine eyes of 39 patients received a single-piece hydrophilic acrylic (PC 511, Ophtec) IOL and 33 eyes of 33 patients – single-piece hydrophobic acrylic (AcrySof, SA60AT, Alcon) IOL. Visual acuity, anterior capsule opacification (ACO), capsulorrhexis/optic overlapping, and posterior capsule opacification (PCO) were evaluated. The intensity of ACO was assessed subjectively. PCO values in the entire IOL optic area and in the central 3-mm optic zone were assessed using a photographic image analysis system (EPCO 2000). The patients were examined at one year postoperatively. Results. There were no significant differences in best-corrected visual acuity and capsulorrhexis/optic overlapping between IOL types at 1-year follow-up after surgery. In the single-piece hydrophilic acrylic IOL group, the grade of ACO density was significantly higher in capsulorrhexis rim area (1.56±0.71 and 1.00±0.75) and in the capsule/optic area (1.62±0.67 and 1.00±0.75) (P<0.05). PCO values of the entire IOL optic area (0.12±0.13 and 0.024±0.02) as well as in the central 3-mm optic zone (0.06±0.11 and 0.001±0.003) was significantly higher in the single-piece hydrophilic acrylic IOL group one year postoperatively (P<0.05). In 33.3% of cases of the single-piece hydrophilic acrylic IOL group, contraction of haptics to IOL optics was present one year postoperatively, which was not present in any case of the single-piece hydrophobic acrylic IOL group. Conclusions. One-year follow-up after cataract surgery has shown a significant difference in ACO and PCO development comparing single-piece hydrophilic acrylic and single-piece hydrophobic acrylic intraocular lenses. The effect of hydrophobic acrylic foldable lenses on preventing anterior and posterior capsule opacification is mainly a result of the acrylic hydrophobic biomaterial.
Substrate-Induced Liquid Layering: A New Insight into the Heterogeneous Nucleation of Liquid Metals
Authors: Ma Sida , Yan Rui , Jing Tao , Dong Hongbiao
Published: July 2018

Liquid layering, which is a general phenomenon adjacent to the solid substrates, is less understood for its role in heterogeneous nucleation. In this work, the structural features and dynamics of the liquid Al layers induced by the (0001) sapphire and the (0001) TiB2 substrates, respectively, are quantitatively compared based on the ab initio molecular dynamics simulations. An almost fully ordered liquid Al layer is observed adjacent to the TiB2 substrate above the Al melting point, while the liquid layers near the sapphire substrate are weakly ordered with virtually no in-plane translational symmetry. Further liquid layering is facilitated by the ordered liquid layer near the TiB2 substrate, while impeded by the low in-plane ordering of the liquid layers near the sapphire substrate, resulting in different nucleation behaviors for the two systems. The difference in the liquid layering is caused, in part, by the lower adsorption strength at the sapphire–liquid Al interface than that at the TiB2–liquid Al interface. Additionally, the compressive stress imposed on the liquid layers seriously hinders the sapphire-induced liquid layering. We conclude from this work that the interfacial adsorption strength and mismatch alter the heterogeneous nucleation by influencing the features of the substrate-induced liquid layering.
The Effect of Carbon Dissection of Waste Plastics on Inhibiting the Adhesion of Fine Iron Ore Particles during Hydrogen Reduction
Authors: Xu Qiyan , Liu Zhuangzhuang , Li Zhiping , Wang Jianjun , Zhou Li
Published: July 2018

In this research, Australian fine iron ore was reduced by combining pressurized and energy-bearing waste plastics in a fluidized bed. This research aims to obtain preferable operating parameters by synthetically researching the effect of temperature, linear velocity, pressure, size, and mass content of energetic waste plastics, and to clarify the sticking mechanism and the inhibitory mechanism of fine iron ore during the reduction process. The experimental results show that the preferable operating parameters include a reduction temperature of 923–973 K, linear velocity of 0.8 m/s, reduction pressure of 0.15 MPa, particle size of energetic waste plastics of 0.18–0.66 mm, and mass content of energetic waste plastics of 8%. Under the conditions of theses preferable operating parameters, the sticking mechanism of fine iron ore is caused by the reunion of the metal iron atoms. The occurrence states of carbons deposited from waste plastics can be divided into two types: graphite and carbon from Fe3C. Carbon from Fe3C reduces the sticking of fine iron ore, while the graphite hinders the direct contact of iron atoms, thereby effectively controlling the sticking.
Research on Surface Roughness of AlSi10Mg Parts Fabricated by Laser Powder Bed Fusion
Authors: Li Bao-Qiang , Li Zhonghua , Bai Peikang , Liu Bin , Kuai Zezhou
Published: July 2018

AlSi10Mg cubes were fabricated with the laser powder bed fusion (LPBF) process, using different exposure times and scan strategies to gain insight into the effect of energy density and part orientation on surface roughness. The results showed that, with increasing energy density, the five-face roughness first decreased and then increased, whereas the top roughness increased slightly. Moreover, considerable differences in roughness appeared for the different faces. A good surface quality was obtained at 175 J/mm3 and 200 J/mm3 when the rotation start angle and rotation increment angle were set as 0 in meander scan mode. The roughness variation was caused by the scan direction, gas flow direction, and wiper movement direction. The scan strategies with rotation increments of 90° effectively narrowed the variation. These results support direct part orientation and placement and can guide users to further reduce roughness through process optimisation or simplification of post-processing procedures.
Effect of Tool Rotational Speeds on the Microstructure and Mechanical Properties of a Dissimilar Friction-Stir-Welded CuCrZr/CuNiCrSi Butt Joint
Authors: Sun Youqing , He Diqiu , Xue Fei , Lai Ruilin
Published: July 2018

In this study, dissimilar CuNiCrSi and CuCrZr butt joints were friction stir welded at a constant welding speed of 150 mm/min, but at different rotational speeds of 800, 1100, 1400, 1700, and 2100 rpm. Sound joints were achieved at the rotational speeds of 1400 and 1700 rpm. It was found that the area of retreating material and grain size in the nugget zone increased with the increase of tool rotational speeds. The base metal on the CuNiCrSi side (CuNiCrSi-BM) contains a large density of Cr and δ-Ni2Si precipitates, and a great deal of Cr precipitates can be observed in the base metal on the CuCrZr side (CuCrZr-BM). All these precipitates are completely dissolved into the matrix in both the nugget zone on the CuCrZr side (CuCrZr-NZ) and the nugget zone on the CuNiCrSi side (CuNiCrSi-NZ). The precipitation strengthening plays a dominant role in the base metals, but the grain boundary strengthening is more effective in improving the mechanical properties in the nugget zone. Both the hardness and tensile strength decrease sharply from the base metal to the nugget zone due to the dissolution of precipitates. Mechanical properties such as microhardness and tensile strength in the nugget zone decrease with the increase of rotational speeds because the grain size is larger at a higher rotational speed.
AFM-Based Characterization Method of Capacitive MEMS Pressure Sensors for Cardiological Applications
Authors: Miguel Jose Angel , Lechuga Yolanda , Martinez Mar
Published: July 2018

Current CMOS-micro-electro-mechanical systems (MEMS) fabrication technologies permit cardiological implantable devices with sensing capabilities, such as the iStents, to be developed in such a way that MEMS sensors can be monolithically integrated together with a powering/transmitting CMOS circuitry. This system on chip fabrication allows the devices to meet the crucial requirements of accuracy, reliability, low-power, and reduced size that any life-sustaining medical application imposes. In this regard, the characterization of stand-alone prototype sensors in an efficient but affordable way to verify sensor performance and to better recognize further areas of improvement is highly advisable. This work proposes a novel characterization method based on an atomic force microscope (AFM) in contact mode that permits to calculate the maximum deflection of the flexible top plate of a capacitive MEMS pressure sensor without coating, under a concentrated load applied to its center. The experimental measurements obtained with this method have allowed to verify the bending behavior of the sensor as predicted by simulation of analytical and finite element (FE) models. This validation process has been carried out on two sensor prototypes with circular and square geometries that were designed using a computer-aided design tool specially-developed for capacitive MEMS pressure sensors.
On the Mechanism of Magnesium Storage in Micro- and Nano-Particulate Tin Battery Electrodes
Authors: Nacimiento Francisco , Cabello Marta , Pérez-Vicente Carlos , Alcántara Ricardo , Lavela Pedro , Ortiz Gregorio F. , Tirado José L.
Published: July 2018

This study reports on the electrochemical alloying-dealloying properties of Mg2Sn intermetallic compounds. 119Sn Mössbauer spectra of β-Sn powder, thermally alloyed cubic-Mg2Sn, and an intermediate MgSn nominal composition are used as references. The discharge of a Mg/micro-Sn half-cell led to significant changes in the spectra line shape, which is explained by a multiphase mechanism involving the coexistence of c-Mg2Sn, distorted Mg2−δSn, and Mg-doped β-Sn. Capacities and capacity retention were improved by using nanoparticulate tin electrodes. This material reduces significantly the diffusion lengths for magnesium and contains surface SnO and SnO2, which are partially electroactive. The half-cell potentials were suitable to be combined versus the MgMn2O4 cathodes. Energy density and cycling properties of the resulting full Mg-ion cells are also scrutinized.
Three-Dimensionally Conformal Porous Polymeric Microstructures of Fabrics for Electrothermal Textiles with Enhanced Thermal Management
Authors: Liu Su , Gong Jianliang , Xu Bingang
Published: July 2018

Three-dimensionally conformal porous microstructured fabrics (3CPMFs) are a new kind of modified fabrics with three-dimensionally conformal porous microstructures of introduced materials recently developed for wearable technology. They can effectively introduce customized functional performance based on the choice of brick materials, while at the same time maintain the excellent inherent properties of textiles. In this paper, based on the introduction of polystyrene with low thermal conductivity at only 8 × 10−4 g cm−2, we developed a kind of polyester fabric-based 3CPMF with enhanced thermal insulation, while maintaining its unique fabric texture, flexibility, moisture permeability, and light weight. It was demonstrated to be a good textile material for the fabrication of wearable electrothermal textile (ET) devices with enhanced thermal management. Compared to pristine fabric-based ET devices, this kind of 3CPMF-based ET devices can obtain higher temperatures under the same input power to provide thermal comfort for human beings, while saving more electric power to achieve the same thermal equilibrium temperature. We believe that, based on the choice of different functional materials and textiles, a wide range of 3CPMFs with customized functionalities and properties can be designed and developed for the realization of a brand-new class of truly wearable devices with desired functional performance and daily garment-like safety and comfort.
Synthesis of Polypyrrole Induced by [Fe(CN)6]3− and Redox Cycling of [Fe(CN)6]4−/[Fe(CN)6]3−
Authors: Andriukonis Eivydas , Ramanaviciene Almira , Ramanavicius Arunas
Published: July 2018

Chemical synthesis of the conducting polymer polypyrrole induced by [Fe(CN)6]3− is reported. Reaction kinetics were characterized spectrophotometrically. Reaction rate was evaluated at several different pH levels in the presence of [Fe(CN)6]3− and [Fe(CN)6]4− ions. The formation of polypyrrole at aerobic and anaerobic conditions was evaluated. We report that at anaerobic conditions [Fe(CN)6]4− cannot initiate oxidative polymerization, while its oxidized form [Fe(CN)6]3− successfully initiates and maintains the pyrrole polymerization reaction. The formation of polypyrrole was also observed in the solution containing a pyrrole monomer, [Fe(CN)6]4− and dissolved oxygen due to re-oxidation (redox cycling) of [Fe(CN)6]4− into [Fe(CN)6]3− by dissolved oxygen. Experiments to determine the polymerization reaction rate were performed and showed the highest rate in the presence of 0.5 mM of [Fe(CN)6]3− at pH 9.0, while the polymerization reaction performed at pH 7.0 was determined as the slowest. This investigation opens new horizons for the application of [Fe(CN)6]4−/[Fe(CN)6]3−-based redox cycling reactions in the synthesis of the conducting polymer polypyrrole and potentially in the formation of other conducting polymers which can be formed by oxidative polymerization.
The Generational Dimension in Transitions: A Theoretical Review
Authors: Moreno Almudena , Urraco Mariano
Published: July 2018

The aim of this article is to question the notions of ‘generation’ and ‘transitions’ from a theoretical perspective by making a brief historical incursion into the sociology of generations. This review will explore the latest ideas on youth transitions to establish theoretical bridges between the different authors, and between the classic and modern approaches. It also takes a deeper look at an emerging theoretical model that seeks to connect these two important issues, transitions and the notion of generation. The debate focuses on how youth transitions are conceptualised from a micro perspective as individual and individualised processes, underlining the idea that they are based on specific macro concepts of ‘youth’ in generational terms. The concept of social generation allows the micro aspects of transitions to be associated with the historical situation in which they occur. This theoretical approach proposes that young people’s transitional behaviours are subject to the mechanisms of intergenerational change, but also notes that transitions can be differentiated according to the position they occupy in the social structure. In summary, this article supports the idea that youth transitions are different in their manifestations, although they may have a similar generational basis. The aim is therefore to introduce a broader theoretical view that includes the predecessors and successors of the classics, and serves as a point of departure for an approach designed to understand the formats of the new ‘youth status’, and hence, offer a more accurate scientific explanation for examining the overworked notions of generation and transition.
Systemic Sustainability of the French Organic Rice and PGI Einkorn Value Chains: A Preliminary Assessment Based on Network Analysis
Authors: Quiédeville Sylvain , Bassene Jean-Baptiste , Lançon Frédéric , Chabrol Didier , Moustier Paule
Published: July 2018

Public authorities and consumers increasingly support food value chains that are more environmentally friendly. However, these value chains are faced with technical, economic and institutional limitations, calling into question their long-term viability. Based on two case studies of alternative food chains in France, namely einkorn (Triticum monococcum) in Haute Provence and organic rice in the Camargue, we evaluated their capacity to remain both viable and environmentally, economically and socially sustainable. After assessing the traditional economic, social and environmental performance of their sustainability, we performed a network analysis to determine the survivability of the systems. The combined use of the traditional pillars of sustainability and the network analysis forms what we term the systemic sustainability. Results suggest that the einkorn value chain is characterised by a high degree of centrality represented by a producers’ association, although the systemic sustainability of the chain is reduced by its dependence on a leading processor. As for the organic rice value chain, centralised power is exerted by three companies embedded in a strong network of actors characterised by diversified connections. The paper concludes by highlighting the potential interest of conducting a network analysis to better determine the sustainability of food value chains.
Durability Indicators for Sustainable Self-Consolidating High-Strength Concrete Incorporating Palm Oil Fuel Ash
Authors: Salam Md. , Safiuddin Md. , Jumaat Mohd.
Published: July 2018

This paper presents the durability indicators for sustainable self-consolidating high-strength concrete (SCHSC) including palm oil fuel ash (POFA) as a supplementary cementing material (SCM). SCHSC mixes were prepared by varying the water to binder (W/B) ratio and POFA content. The W/B ratio was varied in the range of 0.25 to 0.40, and the POFA content differed in the range of 10–30% to produce the desired SCHSC mixes. The tests conducted on the freshly mixed SCHSCs to evaluate their filling ability, passing ability, and segregation resistance were slump flow, J-ring flow, and sieve segregation, respectively. To evaluate the durability of the hardened SCHSCs, the compressive strength, water absorption, and permeable porosity were examined along with the ultrasonic pulse velocity (UPV). The correlations between different hardened properties were derived to ascertain the durability indicators for sustainable SCHSCs. It was observed that most of the SCHSCs possessed excellent filling ability and passing ability with adequate segregation resistance. The test results also revealed that the compressive strength and UPV increased, whereas the water absorption and permeable porosity decreased with a lower W/B ratio and a higher amount of POFA (up to 20% weight content). Moreover, strong correlations were found between the different hardened properties of SCHSC. These correlations were used to determine the durability indicators for sustainable SCHSC with respect to compressive strength, permeable porosity, and water absorption. In accordance with the derived durability indicators, the sustainable SCHSC mixes produced in this study had the durability levels varying from “high” to “outstanding”.
Sectoral Energy Demand Forecasting under an Assumption-Free Data-Driven Technique
Authors: Ameyaw Bismark , Yao Li
Published: July 2018

In order to implement sustainable economic policies, realistic and high accuracy demand projections are key to drawing and implementing realizable environmentally-friendly energy policies. However, some core energy models projections depict considerably high forecast inaccuracies in their previous projections. The inaccuracies are due to the massive assumption-driven variables whose assumptions and scenarios typically deviate from their realized levels. Here, we propose a high-accuracy assumption-free own-data-driven technique that utilizes zero of the traditional determinants as well as assumptions or scenarios for sectorial energy demand forecasting; and implement it in the United States (U.S.). The results show that the forecast accuracy of our gated recurrent network presents an enormous improvement on Annual Energy Outlook 2008 forecast projections. With evidence that our proposed sequential algorithm outperformed Annual Energy Outlook 2008 forecast projections, our proposed algorithm will guide policymakers in making sustainable energy-related policies in the near future. Although future realized consumption levels are unknown, we present our estimated projections along with Annual Energy Outlook 2018 projections to inform policymakers on future energy demands for the commercial sector, industrial sector, residential sector, and transportation.
Bridging Sustainability and Corporate Social Responsibility: Culture of Monitoring and Evaluation of CSR Initiatives in India
Authors: Singh Shyam , Holvoet Nathalie , Pandey Vivek
Published: July 2018

This study examines the continuum of sustainability and corporate social responsibility (CSR) policies, and analyzes broad patterns that have emerged with respect to monitoring and evaluation practices in the CSR programs of Indian companies under new CSR regulations. Under these regulations, the Indian firms are mandated to spend at least 2% of their profits on social and development sectors. We specifically analyze (i) how Indian companies have conceptualized the idea of sustainability in their annual sustainability reports, and how these ideas get reflected in their CSR policies, and (ii) the monitoring and evaluation practices in CSR interventions. The study uses both primary and secondary data sources, and employs text network analysis and narratives-based content analysis to analyze the data. We find that the conceptualization of sustainability is a largely rhetoric and customary exercise that does not take into account variations in firms’ businesses. This approach toward sustainability initiatives presents serious challenges to sustainability, including social sustainability. The study also finds that there is lack of ‘willingness’ and ‘readiness’ among Indian companies to measure and monitor the outcomes of CSR interventions, which is arguably one of the most robust ways to signal their commitment toward corporate sustainability. Although mandatory CSR spending is a recent phenomenon in India, our study establishes that it is only through the design of effective CSR policies that the best practices for Indian business community can emerge in the near future.
Cryptanalysis of an Image Encryption Algorithm Based on Combined Chaos for a BAN System, and Improved Scheme Using SHA-512 and Hyperchaos
Authors: Ahmad Musheer , Al Solami Eesa , Wang Xing-Yuan , Doja M. N. , Beg M. M. Sufyan , Alzaidi Amer Awad
Published: July 2018

The issues of identity authentication and privacy protection of individuals in body area network (BAN) systems have raised much concern in past few years. To address the challenges of privacy protection in wireless BAN, an image encryption algorithm has been proposed recently by Wang et al. The encryption algorithm utilized two 1D chaotic maps to generate sub-chaotic matrices which are combined to perform encryption. The algorithm has good statistical encryption performance. However, a cautious inquiry finds that it has some underlying security defects. This paper evaluates the security of the Wang et al. encryption algorithm to show that it is totally breakable under proposed cryptanalysis and hence infeasible for privacy protection in BAN. It has been shown that the plain-image data can be recovered without any prior knowledge of secret key and plain-text. Furthermore, this paper also suggests an improved encryption scheme using secure hash algorithm SHA-512 for one-time keys and a 4D hyperchaotic system to subdue the security insufficiencies of the algorithm under study. The simulation results and analysis demonstrate that the improved image encryption scheme has excellent encryption quality, plain-image sensitivity, and resistance to possible cryptanalytic attacks.
Distribution of Tetrodotoxin in the New Zealand Clam, Paphies australis, Established Using Immunohistochemistry and Liquid Chromatography-Tandem Quadrupole Mass Spectrometry
Authors: Biessy Laura , Smith Kirsty F. , Boundy Michael J. , Webb Stephen C. , Hawes Ian , Wood Susanna A.
Published: July 2018

Tetrodotoxin (TTX) is one of the most potent neurotoxins known. It was originally thought to only occur in puffer fish but has now been identified in twelve different classes of freshwater and marine organisms, including bivalves. Despite being one of the world’s most studied biotoxins, its origin remains uncertain. There is contradictory evidence regarding the source of TTX and its pathway through food webs. To date, the distribution of TTX has not been examined in bivalves. In the present study, 48 Paphies australis, a TTX-containing clam species endemic to New Zealand, were collected. Thirty clams were dissected, and organs and tissues pooled into five categories (siphons, digestive gland, adductor muscles, and the ‘rest’) and analyzed for TTX using liquid chromatography-mass spectrometry (LC-MS). The micro-distribution of TTX was visualized in the remaining 18 individuals using an immunohistological technique incorporating a TTX-specific monoclonal antibody. The LC-MS analysis revealed that siphons contained the highest concentrations of TTX (mean 403.8 µg/kg). Immunohistochemistry analysis showed TTX in the outer cells of the siphons, but also in the digestive system, foot, and gill tissue. Observing TTX in organs involved in feeding provides initial evidence to support the hypothesis of an exogenous source in P. australis.