bluuebunny/crossref_metadata_2025 huggingface dataset:
Valorization of sugarcane bagasse by chemical pretreatment and enzyme mediated deconstruction
Authors: Thite Vihang S. , Nerurkar Anuradha S.
Published: November 2019

After chemical pretreatment, improved amenability of agrowaste biomass for enzymatic saccharification needs an understanding of the effect exerted by pretreatments on biomass for enzymatic deconstruction. In present studies, NaOH, NH4OH and H2SO4 pretreatments effectively changed visible morphology imparting distinct fibrous appearance to sugarcane bagasse (SCB). Filtrate analysis after NaOH, NH4OH and H2SO4 pretreatments yielded release of soluble reducing sugars (SRS) in range of ~0.17–0.44%, ~0.38–0.75% and ~2.9–8.4% respectively. Gravimetric analysis of pretreated SCB (PSCB) biomass also revealed dry weight loss in range of ~25.8–44.8%, ~11.1–16.0% and ~28.3–38.0% by the three pretreatments in the same order. Release of soluble components other than SRS, majorly reported to be soluble lignins, were observed highest for NaOH followed by H2SO4 and NH4OH pretreatments. Decrease or absence of peaks attributed to lignin and loosened fibrous appearance of biomass during FTIR and SEM studies respectively further corroborated with our observations of lignin removal. Application of commercial cellulase increased raw SCB saccharification from 1.93% to 38.84%, 25.56% and 9.61% after NaOH, H2SO4 and NH4OH pretreatments. Structural changes brought by cell wall degrading enzymes were first time shown visually confirming the cell wall disintegration under brightfield, darkfield and fluorescence microscopy. The microscopic evidence and saccharification results proved that the chemical treatment valorized the SCB by making it amenable for enzymatic saccharification.
Al5+αSi5+δN12, a new Nitride compound
Authors: Dagher R. , Lymperakis L. , Delaye V. , Largeau L. , Michon A. , Brault J. , Vennéguès P.
Published: November 2019

The family of III-Nitride semiconductors has been under intensive research for almost 30 years and has revolutionized lighting applications at the dawn of the 21st century. However, besides the developments and applications achieved, nitride alloys continue to fuel the quest for novel materials and applications. We report on the synthesis of a new nitride-based compound by using annealing of AlN heteroepitaxial layers under a Si-atmosphere at temperatures between 1350 °C and 1550 °C. The structure and stoichiometry of this compound are investigated by high resolution transmission electron microscopy (TEM) techniques and energy dispersive X-Ray (EDX) spectroscopy. Results are supported by density functional theory (DFT) calculations. The identified structure is a derivative of the parent wurtzite AlN crystal where the anion sublattice is fully occupied by N atoms and the cation sublattice is the stacking of 2 different planes along <0001>: The first one exhibits a ×3 periodicity along <11–20> with 1/3 of the sites being vacant. The rest of the sites in the cation sublattice are occupied by an equal number of Si and Al atoms. Assuming a semiconducting alloy, a range of stoichiometries is proposed, Al5+αSi5+δN12 with α being between −2/3 and 1/4 and δ between 0 and 3/4.
CRISPR interference to interrogate genes that control biofilm formation in Pseudomonas fluorescens
Authors: Noirot-Gros Marie-Francoise , Forrester Sara , Malato Grace , Larsen Peter E. , Noirot Philippe
Published: November 2019

Bacterial biofilm formation involves signaling and regulatory pathways that control the transition from motile to sessile lifestyle, production of extracellular polymeric matrix, and maturation of the biofilm 3D structure. Biofilms are extensively studied because of their importance in biomedical, ecological and industrial settings. Gene inactivation is a powerful approach for functional studies but it is often labor intensive, limiting systematic gene surveys to the most tractable bacterial hosts. Here, we adapted the CRISPR interference (CRISPRi) system for use in diverse strain isolates of P. fluorescens, SBW25, WH6 and Pf0-1. We found that CRISPRi is applicable to study complex phenotypes such as cell morphology, motility and biofilm formation over extended periods of time. In SBW25, CRISPRi-mediated silencing of genes encoding the GacA/S two-component system and regulatory proteins associated with the cylic di-GMP signaling messenger produced swarming and biofilm phenotypes similar to those obtained after gene inactivation. Combined with detailed confocal microscopy of biofilms, our study also revealed novel phenotypes associated with extracellular matrix biosynthesis as well as the potent inhibition of SBW25 biofilm formation mediated by the PFLU1114 operon. We conclude that CRISPRi is a reliable and scalable approach to investigate gene networks in the diverse P. fluorescens group.
Damage analysis of a perfect broadband absorber by a femtosecond laser
Authors: Haque Ahasanul , Morshed Monir , Li Ziyuan , Li Li , Vora Kaushal , Xu Lei , Fu Lan , Miroshnichenko Andrey , Hattori Haroldo T.
Published: November 2019

Plasmonic metamaterial absorbers are particularly important in different applications such as photodetectors, microbolometers and solar cells. In this paper, we propose a tungsten boride (WB, a refractory ceramic) based broadband metamaterial absorber whose optical properties is numerically analyzed and experimentally characterized. We have also analyzed the damage characteristics of this absorber using a femtosecond laser and compared with an ordinary Au metamaterial absorber. We observe that WB has almost the double absorption bandwidth with absorption more than 90% over the spectral range of 950 to 1400 nm when compared with the Au counterpart. Furthermore, we show that Au metamaterial is damaged at the power of around 36.4 mW whereas WB metamaterial is not damaged at that power (WB has high Tammann temperature than Au)-however the atom of WB material was knocked off by the bombardment of a femtosecond laser.
Investigating the Integrity of Graphene towards the Electrochemical Hydrogen Evolution Reaction (HER)
Authors: García-Miranda Ferrari Alejandro , Brownson Dale A. C. , Banks Craig E.
Published: November 2019

Mono-, few-, and multilayer graphene is explored towards the electrochemical Hydrogen Evolution Reaction (HER). Careful physicochemical characterisation is undertaken during electrochemical perturbation revealing that the integrity of graphene is structurally compromised. Electrochemical perturbation, in the form of electrochemical potential scanning (linear sweep voltammetry), as induced when exploring the HER using monolayer graphene, creates defects upon the basal plane surface that increases the coverage of edge plane sites/defects resulting in an increase in the electrochemical reversibility of the HER process. This process of improved HER performance occurs up to a threshold, where substantial break-up of the basal sheet occurs, after which the electrochemical response decreases; this is due to the destruction of the sheet integrity and lack of electrical conductive pathways. Importantly, the severity of these changes is structurally dependent on the graphene variant utilised. This work indicates that multilayer graphene has more potential as an electrochemical platform for the HER, rather than that of mono- and few-layer graphene. There is huge potential for this knowledge to be usefully exploited within the energy sector and beyond.
Metal carbonyl cluster-based coordination polymers: diverse syntheses, versatile network structures, and special properties
Authors: Shieh Minghuey , Liu Yu-Hsin , Li Yu-Huei , Lin Ru Yan
Published: November 2019

This highlight surveys recent progress in groups 6–10 metal carbonyl cluster-based coordination polymers, focusing on diverse synthetic strategies, versatile structures, structural transformations, and semiconducting as well as magnetic properties.
Mechanistic insights into the phenomena of increasing capacity with cycle number: using pulsed-laser deposited MoO2thin film electrodes
Authors: Fenech Michael , Lim Sean , Cheung Jeffrey , Sharma Neeraj
Published: November 2019

Thin film electrodes often feature fluctuations in capacity with cycle number. This work shows how electrode reactions and peeling off the current collector is a plausible mechanism for these fluctuations.
A Cu/Zn heterometallic complex with solvent-binding cavity, catalytic activity for the oxidation of 1-phenylethanol and unusual magnetic properties
Authors: Mielcarek Agnieszka , Bieńko Alina , Saramak Paulina , Jezierska Julia , Dołęga Anna
Published: November 2019

Cu/Zn metallocycle efficiently catalyzes oxidation of phenylethanol. The catalytic activity is ascribed to the open access to Cu(ii) ions at the walls of the cavity of the complex and spatial restraints imposed by its rigid molecular structure.
Structure–property-reactivity studies on dithiaphospholes
Authors: Ould Darren M. C. , Tran Thao T. P. , Rawson Jeremy M. , Melen Rebecca L.
Published: November 2019

The crystal structures of P-halo-1,2,3-dithiaphospholes and the reduced P–P coupled dimer are reported. Treatment with Lewis acids affords phosphenium cations which are shown to be active catalysts for hydroboration reactions.
An amino-functionalized metal–organic framework nanosheet array as a battery-type electrode for an advanced supercapattery
Authors: Li Qin , Zhou Jiaojiao , Liu Rui , Han Lei
Published: November 2019

An amino-functionalized metal–organic framework nanosheet array supported on nickel foam (NH2-Co-MOF-NS/NF) was fabricated and served as a binder-free battery-type electrode for a supercapattery device.
Cooperative ruthenium complex catalyzed multicomponent synthesis of pyrimidines
Authors: Maji Milan , Kundu Sabuj
Published: November 2019

The ruthenium-catalyzed multicomponent synthesis of pyrimidines from amidines and alcohols is reported for the first time.
Multi-stimuli responsive tetra-PPO60-PEO20 ethylene diamine block copolymer enables pH, temperature, and solvent regulation of Au nanoparticle composite plasmonic response
Authors: Diouf Sokhna I. Y. , Williams Darrick J. , Seifert Sönke , Londoño-Calderon Alejandra , Pettes Michael T. , Sheehan Christopher J. , Firestone Millicent A.
Published: November 2019

Dynamic plasmonic tuning of Au NP organization through pH and temperature mediated polymer architecture transformation from lamellar to bicontinuous cubic.
X-ray absorption near edge structure simulation of LiNi0.5Co0.2Mn0.3O2via first-principles calculation
Authors: Ohnuma Toshiharu , Kobayashi Takeshi
Published: November 2019

Simulation of Ni K-edge X-ray absorption near edge structure (XANES) spectra in LiNi0.5Co0.2Mn0.3O2 (NCM523) was performed.
Enhancing oxygen and hydrogen evolution activities of perovskite oxide LaCoO3via effective doping of platinum
Authors: Wang Caiyun , Zeng Lirong , Guo Wei , Gong Cairong , Yang Jing
Published: November 2019

Among the perovskite LaCo1−xPtxO3−δ catalysts, LaCo0.94Pt0.06O3−δ proved best for catalyzing OER/HER, with η = 454/294 mV, which might be attributed to LCP6 having the eg orbital filling of Co closest to 1.2.
Influence of solution pH on degradation of atrazine during UV and UV/H2O2 oxidation: kinetics, mechanism, and degradation pathways
Authors: Liu Yucan , Zhu Kai , Su Miaomiao , Zhu Huayu , Lu Jianbo , Wang Yuxia , Dong Jinkun , Qin Hao , Wang Ying , Zhang Yan
Published: November 2019

The kinetics, degradation mechanism and degradation pathways of atrazine (ATZ) during sole-UV and UV/H2O2 processes under various pH conditions were investigated; the effects of UV irradiation time and H2O2 dose were also evaluated.
Bulky cations greatly increase the turnover of a native hammerhead ribozyme
Authors: Nakano Shu-ichi , Yamashita Hirofumi , Tanabe Kazuya , Sugimoto Naoki
Published: November 2019

Large tetraalkylammonium ions increase the turnover rate of the ribozyme derived from an intronic ribozyme in the human genome. The rate can be enhanced by more than a hundred-fold at the optimal concentrations of Mg2+ and TPeA ions.
An efficient and thermally stable dye-sensitized solar cell based on a lamellar nanostructured thiolate/disulfide liquid crystal electrolyte and carbon/PEDOT composite nanoparticle electrode
Authors: Wang Caihong , Li Xueyong , Wu Yong , Tan Shuai
Published: November 2019

A combination of smectic thiolate/disulfide electrolyte and PEDOT/carbon nanoparticle electrode greatly improves inner charge transfer for an efficient and stable DSSC.
Phase transition in Cu2+xSnS3+y(0 ≤x≤ 2; 0 ≤y≤ 1) ternary systems synthesized from complexes of coumarin derived thiocarbamate motifs: optical and morphological properties
Authors: Adekoya Joseph Adeyemi , Khan Malik Dilshad , Revaprasadu Neerish
Published: November 2019

Tetragonal Cu2SnS3and orthorhombic Cu4SnS4nanocubes were synthesized by a heat up procedure with oleylamine (OLA) and dodecanethiol (DT) acting as both solvent and capping ligands.
Correction: Quantum chemical elucidation of the turn-on luminescence mechanism in two new Schiff bases as selective chemosensors of Zn2+: synthesis, theory and bioimaging applications
Authors: Berrones-Reyes Jessica C. , Muñoz-Flores Blanca M. , Cantón-Diáz Arelly M. , Treto-Suárez Manuel A. , Páez-Hernández Dayan , Schott Eduardo , Zarate Ximena , Jiménez-Pérez Víctor M.
Published: November 2019

Correction for ‘Quantum chemical elucidation of the turn-on luminescence mechanism in two new Schiff bases as selective chemosensors of Zn2+: synthesis, theory and bioimaging applications’ by Jessica C. Berrones-Reyes et al., RSC Adv., 2019, 9, 30778–30789.
Water-soluble polyglycerol-dendronized poly(norbornene)s with functional side-chains
Authors: Cho Sung Hyun , Yang Si Kyung
Published: November 2019

We report the synthesis of water-soluble G4 polyglycerol-dendronized poly(norbornene)s with reactive functional groups on the side-chains.
Atomistic simulation of PDADMAC/PSS oligoelectrolyte multilayers: overall comparison of tri- and tetra-layer systems
Authors: Sánchez Pedro A. , Vögele Martin , Smiatek Jens , Qiao Baofu , Sega Marcello , Holm Christian
Published: November 2019

By employing large-scale molecular dynamics simulations of atomistically resolved oligoelectrolytes in aqueous solutions, we study in detail the first four layer-by-layer deposition cycles of a PDADMAC/PSS oligoelectrolyte multilayer.
Field-induced surface deformation of magnetoactive elastomers with anisometric fillers: a single-particle model
Authors: Nadzharyan T. A. , Stolbov O. V. , Raikher Yu. L. , Kramarenko E. Yu.
Published: November 2019

Surface relief of magnetoactive elastomers (MAEs) based on soft polymer matrices filled with anisometric magnetically hard fillers is studied theoretically in magnetic fields applied perpendicular to the MAE surface.
Strain-tunable electronic properties and lithium storage of 2D transition metal carbide (MXene) Ti2CO2 as a flexible electrode
Authors: Li Yiran , Li Na , Zhao Shijun , Fan Jun , Kai Ji-Jung
Published: November 2019

This work provides encouragement for the strain-tunable conduction behavior and lithium storage in Ti2CO2 and further shed light on the design and selection of electrode candidates for flexible energy storage applications.
Study of active sites on Se-MnS/NiS heterojunctions as highly efficient bifunctional electrocatalysts for overall water splitting
Authors: Zhu Jie , Sun Mao , Liu Shujie , Liu Xianhu , Hu Kan , Wang Lei
Published: November 2019

Se-doped MnS/NiS as a highly efficient bifunctional electrocatalyst.
A self-healable and antifouling hydrogel based on PDMS centered ABA tri-block copolymer polymersomes: a potential material for therapeutic contact lenses
Authors: Banerjee Sovan Lal , Samanta Sarthik , Sarkar Shrabana , Singha Nikhil K.
Published: November 2019

We have prepared an antifouling and self-healable PDMS based hydrogel which consists of a mixture of curcumin loaded zwitterionic PDMS polymersomes and amine functionalized PDMS polymersomes prepared via RAFT polymerization and Schiff-base reaction.
In situ derivatization of Au nanoclusters via aurophilic interactions of a triphenylphosphine gold(i) salt with neurotransmitters and their rapid MALDI-TOF-MS detection in mice brain tissue extracts
Authors: Palanisamy Sivakumar , Huang Shuai , Zhao Huiyuan , Zhu Di , Zhang Xiaozhe
Published: November 2019

Rapid MALDI-TOF-MS detection of neurotransmitters in mice brain tissue extracts using triphenylphosphine gold(i) salt as an efficient matrix.
A colorimetric and electrochemical dual-mode biosensor for thrombin using a magnetic separation technique
Authors: Guo Wen-Jing , Yang Xiao-Yan , Wu Zhen , Zhang Zhi-Ling
Published: November 2019

A colorimetric and electrochemical dual-mode biosensor for thrombin based on the combination of a magnetic separation technique and a signal amplification strategy.
Accurate modelling of power amplifier energy consumption for resource allocation in wireless networks
Authors: Moazzen H. , Mohammadi A. , Majidi M.
Published: November 2019

A new model for the power consumption of RF power amplifiers (PAs) in terms of the input power based on Lambert W‐function is presented. In the derivation of the model, the knee voltage effect of the field effect transistors is taken into account. Accordingly, the model can capture the behaviour of the PA power consumption in saturation. The proposed model can be used for energy efficient resource allocation of the wireless systems considering the consumed power by the PAs.
Adaptive impedance‐based out‐of‐step detection of synchronous generator without any network reduction
Authors: Yaghobi Hamid
Published: November 2019

An adaptive technique for out‐of‐step (OOS) protection by modifying the impedance‐based method is proposed in this study. Impedance‐based methods are powerful and are operational in the power system as the main protection of OOS conditions. The setting of these relays depends on some parameters of the generator and power system that should be updated for the setting. The presence or absence of generator units in a power plant and transient conditions directly affects the machine dynamic parameters. Service or not in service of power lines and power system configurations can change the impedance of the power system at the generator terminals. Furthermore, to use the methods in a multi‐machine power system, an equivalent two‐area system is needed that is a complicated and time‐consuming procedure. It should be made clear that these complexities limit the application of the impedance‐based methods. Therefore, to remove these complexities, all factors that influence the relay setting are considered together in this research. The simulation results show that the proposed adaptive technique overcomes some of the problems and difficulties associated with impedance‐based methods as well.
Active Surveillance in Adults with Low-Risk Papillary Thyroid Microcarcinomas: A Prospective Study
Authors: Rosario Pedro Weslley , Mourão Gabriela Franco , Calsolari Maria Regina
Published: November 2019

The acceptance and results of active surveillance in patients with low-risk papillary thyroid microcarcinomas (PTMC) are unknown in populations other than the Japanese population. This was the objective of the present prospective study. We selected patients ≥20 years who had thyroid nodules ≤1.2 cm with intermediate or high suspicion for malignancy on ultrasonography (US), not located near the recurrent laryngeal nerve and without extrathyroidal invasion or apparent lymph node metastases, whose cytology was suspicious (Bethesda V) or diagnostic (Bethesda VI) of papillary thyroid carcinoma. Patients who opted for active surveillance were followed up by biannual US. Fifteen patients (18.7%) readily opted for surgery and 12 (15%) for active surveillance. Fifty-three patients (66.2%) delegated the decision or wished to know the doctor’s preference before deciding. After the doctor had declared his/her preference for active surveillance, 50 patients decided to have this management and three to have surgery. Only 1/70 patients exhibited tumor progression (growth associated with a suspicion of extrathyroidal invasion) after 30 months of follow-up. Two patients decided to have surgery during follow-up, although the indication was not defined by the study. A>50% reduction in tumor volume was observed in three patients. The study shows that active surveillance can be well accepted if doctors were convinced that it is the best option for patients with low-risk PTMC. At least the short-term results reproduced those observed in other populations, with tumor progression being uncommon.
Clival Chordoma: Endoscopic Bilateral Transmaxillary Approach
Authors: Youssef A. Samy , Yang Alexander , Getz Anne E. , Mizuho Inoue , Labib Mohamed
Published: November 2019

We present a case of a large clival chordoma in a 54-year-old female with a past medical history of Turner's syndrome and a 1.5-year history of nasal congestion. The tumor was extending in the nasopharynx to both pterygopalatine fossae. An expanded endoscopic endonasal approach was selected. Stereotactic navigation was utilized. Bilateral transmaxillary approach with ethmoidectomy was performed, and a transclival corridor to the deepest portion of the tumor was created. The tumor was successfully dissected off the medial walls of the cavernous sinuses. Gross-macroscopic resection was achieved. Surgical reconstruction of the skull base comprised of a fat graft, fascia lata overlay, and dural sealant. Given the extensive nasal involvement by the tumor, a vascularized nasoseptal flap was not feasible. The patient had an unremarkable postoperative course. She underwent intensity-modulated radiation therapy (IMRT) radiotherapy 6 weeks later, and was seen in follow-up 6 months later, with no issues.

The link to the video can be found at: https://youtu.be/4bnsEUtieAw.
Identification of the novel odor active compounds “p-menthane lactones” responsible for the characteristic aroma of fresh peppermint leaf
Authors: Shigeto Atsushi , Wada Atsushi , Kumazawa Kenji
Published: November 2019

The comparative aroma extract dilution analysis (cAEDA) applied to the volatile fractions of two types of fresh mint leaves (Peppermint and Spearmint) revealed 20 odor-active peaks with high FD factors (≥64). Among the perceived odorants, five “sweet/milky” and “caramel-like/spicy” notes showing high FD factors were characteristic for the peppermint aroma, and were identified as p-menthane lactone derivatives. Especially, the three p-menthane lactone derivatives, “rel-(3S,3aS,6R,7aS)-dihydromintlactone, (3S,3aS,6R)-epoxymenthofurolactone, and 2E-ethylidene-5-methylcyclohexanone”, were newly identified compounds in the peppermint. The biosynthetic routes of the p-menthane lactone derivatives have been suggested to be closely related to menthofuran. Therefore, these findings strongly suggest the possibility that the biosynthetic pathway leading to the p-menthane lactone derivatives via menthofuran plays a significantly important role in the formation of the characteristic aroma of peppermint.
The approximate calculation of 2D field strength with a Coulomb potential by using multipole expansion
Authors: Kuzmina K S , Leonova D D , Marchevsky I K , Ryatina E P
Published: November 2019

The necessary formulae are derived for approximate computation of the Coulomb-type potential and the field strength, generated by system of particles in 2D case. On the one hand, these formulae represent the multipole expansion in which monopole, dipole, quadrupole and octupole terms are taken into account that allows for computing the potential and the field strength, generated by set of the charges with rather high accuracy. On the other hand, polynomial expansions of the obtained formulae are derived up to the cubic terms with respect to the observation point coordinates, which make it possible to compute the field strength at closely located points approximately. The expressions are derived that permit one to compute the multipole moments for the system of charges, which consists of smaller subsystems. Such formulae are required in tree-codes when the hierarchical (tree-type) structure of geometrical regions is introduced in the region of the initial system of the charges. In particular case these expressions allows for changing of the reference point of multipole moments computation (multipole moments shifting). The test problem is considered for rather small number of the charges, which shows the dependency of the relative error of the field strength reconstruction on the type of multipole expansion and number of considered terms in the Taylor expansion.
On the equilibrium positions of the planetary mechanism at the location of the center of mass of the rod between the axes of rotation
Authors: Bondarenko N I , Obnosov K B , Panshina A V
Published: November 2019

In this paper, the positions of stable and unstable equilibrium of the mechanism moving in the vertical plane are determined. The mechanism consists of a rod, load, counterweight and satellite, rolling without slipping on a fixed cylindrical surface. The potential energy function of the mechanism is examines. Only those variants of the mechanism design for which the ratio of the fixed surface radius to the satellite radius is a rational number are considered. The dependence of the number of equilibrium positions of the mechanism on the radius of the satellite and the distance of the load to the center of the satellite is determined by numerical analysis; and the periods of change in the potential energy of the mechanism for different values of the satellite radius are determined.
Transverse Oscillations of a Cantilever Rod of Rectangular Cross Section and Variable Thickness
Authors: Nesterov S V , Baydulov V G
Published: November 2019

A numerical-analytical algorithm for calculating (a type of accelerated convergence method) of eigenvalues and modes of transverse vibrations of a rod of variable cross-section is proposed. The algorithm is implemented as a software package in the Maple symbolic computations language. The use of the package was demonstrated by the example of solving problems of determining the eigen forms and natural frequencies of rods with different dependences of the cross section on the longitudinal distance.
Service delays in strongly linked network communities
Authors: Bogachev M I , Pyko N S , Pyko S A , Vasenev A N , Vasenev A N
Published: November 2019

We analyze aggregated traffic dynamics obtained from strongly linked network communities. Our results based on two empirical data traces from university campus networks indicate that neglecting the statistical links between traffic patterns generated by individual network nodes leads to the drastic underestimation of both waiting and sojourn times. We also show that similar effects can be observed in simulated traffic patterns obtained by agent based modeling. Moreover, we suggest several indices that could be used to quantify the links between nodes and show their relation with the queuing system performance indicators.
On k-error linear complexity over

F

N of interleaved binary sequences derived from four N-periodic ones
Authors: Edemskiy V , Du X , Chen Z
Published: November 2019

We estimate the k-error linear complexity of some interleaved sequences with period 4N over the finite field of order N (N an odd prime). Furthermore, we obtain the exact value of the k-error linear complexity for small value of k of the interleaved sequences obtained from the cyclotomic sequences. In particular, we study the interleaved sequences obtained from Legendre sequences and Hall’s sextic residue sequences, respectively. Our results show that these sequences are quite stable.
Linear complexity of binary sequences with optimal autocorrelation magnitude of length 4N
Authors: Edemskiy V A , Minin A B
Published: November 2019

In this paper, we study the linear complexity of series of binary sequences with optimal autocorrelation magnitude of length 4N. These sequences are obtained from almost-perfect binary sequences and binary sequences with optimal autocorrelation of length N. The construction of these sequences were presented E.I. Krengel and P.V. Ivanov. We show that considered sequences have the high linear complexity. Also we derive the 1-error linear complexity of these sequences.
On the reducing of the acoustic signal length from the piezoelectric transducers of the sea ice monitoring systems
Authors: Ee B Ch , Konovalov R S , Konovalov S I , Kuz’menko A G , Tsaplev V M
Published: November 2019

The solution of navigation problems the ice situation problems in the Arctic region need to study the acoustic parameters and local reflective properties of ice in real conditions. Information about the local sea ice acoustic properties essentially helps to solve the problems of statistical forecasting of reflective and scattering properties of ice cover. The successful solution of these problems mostly depends on the metrological parameters of the probing signals emitted by the primary piezoelectric transducers. This means, that to increase the resolution of the control and measuring equipment it is better to radiate and to receive short acoustic pulses. The article presents the results of analysis the pulse mode of operation of cylindrical piezoelectric transducers designed to measure the velocity of sound in sea ice. To reduce the length of acoustic pulses, an inductive-resistive load is connected to the electrical input of the radiator. The length and the amplitude of the emitted acoustic pulse were estimated using equivalent circuits of piezoelectric transducers and a spectral method based on the Fourier transforms. The optimal parameters of the electrical circuit, ensuring the minimum length of the acoustic pulses are calculated. The technique of possible measurements is described. The results are presented in the most general form, making possible to use them within different frequency ranges.
Classifying neural networks and methods of their illogical behaviour revealing
Authors: Grigoryeva N Y , Zhangirov T R , Perkov A S , Ivanova S A , Liss A A
Published: November 2019

In this article a feedforward error backpropagation artificial neural network is investigated and the analysis of its illogical behaviour is presented. The problem of illogical behavior arises in various models of artificial neural networks. In the presented work a classifying artificial neural network (CANN) is considered and several learning algorithms were implemented and compared. CANN was designed for automatic differentiaition of cyanobacterial strains during environmental monitoring and some of trained networks demonstrated illogical behavior in further testing. Several original techniques were elaborated for estimation of the quality and accuracy of classification in addition to the traditional ones. Novel visualization methods were suggested for classification and generalization results representation.
The study of microwave range energy harvesting device
Authors: Kuzmin E V , Platonov S V , Bichurin M I , Khavanova M A , Nikitin A O , Petrov R V
Published: November 2019

The paper is devoted to the development of the energy harvesting system of microwave range. The block diagram of the system was developed and stands for measuring antenna patterns and study of the transmission voltage dependence from distance were made. To perform the study were selected six types of antennas: dipole, wire dipole, stripline, horn, parabolic and stripline antenna array. The study revealed that the parabolic antenna has the advantage in distance of energy transfer out of the six considered antennas. The achieved value of the potential on the receiving device is about 23 mV at the distance of 9 m. The obtained results allow realizing the energy harvesting system in a small industrial premise or room.
Mathematical model of two-contour tomography scanner
Authors: Mavlyaviev R M , Sadykova E R , Razumova O V
Published: November 2019

In the conditions of transformation and modernization of society, the use of mathematical modeling is of great importance. This is due to the fact that at the present stage a distinctive feature is the introduction of science and technology, complex technical systems in all areas of activity, one of which is the development of diagnostic systems, in particular, the construction of a mathematical model of tomography scanner. The article develops a mathematical model of a two-contour tomography scanner, describes the fields created by a single-point, two-point, single-circuit source, shows the construction of the Green function for the parameter k = 1. The advantage of a two-contour tomography scanner is the presence of a sphere among the equipotential surfaces created by this device, which is convenient for analytical calculations. The final results are accurate, not numerical. This plays a significant role in medical diagnostic studies, where the patient’s health depends on the accuracy of the diagnosis.
Selection of scientific articles according to the degree of proximity to the semantic pattern of the title and phrases of the abstract
Authors: Mikhaylov D V , Emelyanov G M
Published: November 2019

The article is devoted to the problem of numerical evaluation of the proximity of a thematic text to the most rational (reference) language version of the description of the piece of knowledge it represents. This problem is relevant for the implementation of targeted selection of textual information without losing the useful semantic component. Examples of practical applications here can be the selection of articles for publication in scientific journals, as well as the development of training courses and educational portals. In the proposed solution, the basis for assessing the proximity of a text to a semantic pattern (i.e. sense standard) is the division of the words of each phrase into classes according to the value of the TF-IDF measure relative to the texts of the corpus pre-formed by an expert. The analyzed texts considered in the paper are the abstracts of scientific articles along with their titles. At the same time, the semantic images of the texts closest to the standard determine the words with the highest TF-IDF values, which, being neighbors in a linear series, are most likely related by meaning and form key combinations. The proposed numerical estimate of the proximity to the standard makes it possible to rank articles according to the significance of the described fragments of knowledge with respect to a given subject area, as well as to the non-redundancy of the description itself.
On the program implementation of a Markov inhomogeneous random search algorithm with normal distributions
Authors: Tikhomirov A S
Published: November 2019

A program that implements a Markov inhomogeneous monotonous random search algorithm of an extremum with normal distributions is presented. This program allows to solve a fairly wide class of problems of finding the global extremum of an objective function with a high accuracy.
On the program implementation of a Markov homogeneous random search algorithm of an extremum with Ingber’s distribution
Authors: Tikhomirov A S , Kropacheva N Yu
Published: November 2019

A program that implements a Markov homogeneous monotonous random search algorithm of an extremum with Ingber’s distribution is presented. This program allows to solve a fairly wide class of problems of finding the global extremum of an objective function with a high accuracy.
Simulation of probability distributions using two quantile characteristics
Authors: Tokmachev M S
Published: November 2019

The paper presents a method for modeling probability distributions based on the base normal distribution. The transformation of the base distribution includes truncating the distribution, splitting it into three components in accordance with two specified quantiles, multiplying the density function in each of the intervals by a linear factor. The distribution obtained in this way has a complex nonstandard configuration, including mixtures of the normal distribution and the Rayleigh distribution. A computer program has been developed that makes it possible to model the distribution according to its parameters and implements the criterion for the agreement of sample data with the distribution of the specified type with automatic adjustment of the parameters. The construction algorithm allows for use of other base distributions.
Switching waves in the course of elastic deformation by twisting
Authors: Zavorotnev Yu D , Metlov L S , Zakharov A Yu , Tomashevska E Yu
Published: November 2019

Kink solutions of the Landau-Khalatnikov equation have been calculated in the case when elastic deformation by twisting is applied to a semi-infinite rod and a finite one. As a crystal without an inversion center was considered, Lifshitz invariants were taken into account in the thermodynamic potential. The specific features of kink propagation at varied boundary conditions, phase velocities and modulus of the torsion moment have been studied.
XIX Brazilian Colloquium on Orbital Dynamics (2018): a solid path to the 21st century
Authors: de Melo C. F. , Prado A. F. B. A. , Macau E. E. N. , Winter O. C.
Published: November 2019

The Brazilian Colloquium on Orbital Dynamics (CBDO) is a scientific meeting that takes place every two years since 1982. Its main goal is to bring together researchers, professors, undergraduate and post graduate students who develop works on pure and applied Celestial Mechanics in the same lectures and discussions atmosphere, and thus to drive collaboration between these areas. The XIX CBDO 2018 took place at the Test and Integration Laboratory (LIT) of the National Institute for Space Research (INPE), in São José dos Campos (SP), Brazil, between December 03 - 07, 2018, and more than 230 attendant from South and North America, Europe and Asia presented works of which 31 were selected for publication in this volume of the Journal of Physics: Conference Series. The highlight of this issue is the consolidation of the research groups on Celestial Mechanics in several Brazilian universities.
Effects of the mass parameter in the optimum direction of impulse and energy variation in a Powered Swing-By
Authors: Ferreira A F S , Moraes R V , Prado A F B A , Winter O C
Published: November 2019

The energy of a spacecraft, relative to the primary body of the system, before and after a Powered Swing-By maneuver with an impulse applied during the close encounter with the secondary body is studied. The Powered Swing-By maneuver is a combination of the effect of the gravity of a celestial body and an impulse applied to the spacecraft during its passage by the periapsis of its orbit relative to the secondary body. This combination modifies the spacecraft’s trajectory, changing its parameters and, consequently, its energy. The objective is to quantify the effect of different mass parameters on the optimum direction to apply the impulse and in the energy variation of this more complex maneuver. It is focused on the two-dimensional and elliptical maneuver. Optimum solutions for energy gains are presented.
Natural Quasi-Rendezvous and Evasive Maneuvers assisted by Atmospheric Drag
Authors: Jesus A.D.C. , Ferreira L. S. , Sousa R.R.
Published: November 2019

The study of evasive maneuvers of spacecraft in the face of the danger of collision with space debris is essential and important today due to the growth of missions at low altitudes (LEO). Bodies that orbit this region are affected by the Earth’s drag force. In this work, we present the results of numerical simulations for collision dynamics between spatial objects (operational vehicle and space debris) and investigate evasive maneuvers of the vehicle under the possibility of collision with a debris in atmospheric drag environment. We tested the evasive maneuvers for collision conditions in this environment using the exhaust velocity of the vehicle’s propulsion system. We find three important results: 1) evasive maneuvers are possible and the atmospheric drag can contribute to the removal of the collision objects in small and medium intervals of time; 2) for very small initial velocities, there are natural quasi-Rendezvous, under the action of gravity alone and drag; 3) propulsion in conjunction with drag can enable evasive maneuvers for various spatial debris sizes.
A Fealsible Strategy for Building Distant Retrograde Orbits
Authors: Santana Saymon H. S. , Melo Cristiano F. De , Macau Elbert E. N.
Published: November 2019

Specific application of satellites require the building and maintenance of orbits with high altitude. In these cases, conventional orbital transfer methods may prove to be infeasible, especially with respect to fuel consumption. In this work we present an alternative strategy for an orbital transfer of a spacecraft from a low circular orbit to a high and retrograde orbit in the Earth-Moon System. Considering a four-body scenario, the technique consists in the use of appropriate perturbations applied around unstable periodic orbits predicted in the Restricted Three-Body Problem (R3BP), associated with the exploration of the sensitive dependence of the transition regions between capture and escape in the Earth-Moon System. In addition to small transfer times, the results obtained show that it is possible to obtain stable high and inclined final orbits with a low cost in terms of increment of velocity.
Effects of a Community-to-Clinic Navigation Intervention on Colorectal Cancer Screening Among Underserved People
Authors: Menon Usha , Szalacha Laura A , Kue Jennifer , Herman Patricia M , Bucho-Gonzalez Julie , Lance Peter , Larkey Linda
Published: November 2019

Background

Colorectal cancer screening remains suboptimal among poor and underserved people.

Purpose

We tested the effectiveness of a community-to-clinic navigator intervention to guide multicultural, underinsured individuals into primary care clinics to complete colorectal cancer screening.

Methods

This two-phase behavioral intervention study was conducted in Phoenix, Arizona (2012–2018). Community sites were randomized to group education or group education plus tailored navigation to increase attendance at primary care clinics (Phase I). Individuals who completed a clinic appointment received the tailored navigation in person or via phone (Phase II).

Results

In Phase I (N = 345), 37.9% of the intervention group scheduled a clinic appointment versus 19.4% of the comparison group. In Phase II, 26.5% of the original intervention group were screened versus only 10.4% of the original comparison group. Those in the intervention group were 3.84 times more likely to be screened than were those in the comparison group (odds ratio = 3.84; 95% confidence interval = 1.81–6.92).

Conclusions

Translation of an efficacious tailored navigation intervention for colorectal cancer screening to a community-to-clinic context is associated with significantly increased rates of colorectal cancer screening. Navigation assistance to address barriers to screening may serve as the most important component of any educational program to increase individual adherence to colorectal cancer screening.
Facial Feminization Surgery Changes Perception of Patient Gender
Authors: Fisher Mark , Lu Stephen M , Chen Kevin , Zhang Ben , Di Maggio Marcelo , Bradley James P
Published: November 2019

Background

The goal of facial feminization surgery (FFS) is to feminize the sexually dimorphic characteristics of the face and enable transwomen to be correctly gendered as female. Studies have demonstrated high patient satisfaction with FFS. However, the correct gendering of patients after FFS has never been objectively studied.

Objectives

The aim of this study was to determine if FFS changed the perceived gender of patients in the public eye.

Methods

An online survey platform with control photographs of cis-gender males and cis-gender females as well as preoperative and postoperative FFS patients was created. Respondents were asked to identify patients as “male” or “female” and to assign a confidence score ranging from –10 (masculine) to +10 (feminine) (n = 802).

Results

Cis-gender male and female controls were gendered correctly 99% and 99.38% of the time and with a confidence metric (CM) of –8.96 and 8.93, respectively. Preoperative FFS patients were gendered as female 57.31% of the time with a CM of 1.41 despite hormone therapy, makeup, and hairstyle. Postoperative FFS patients were gendered as female 94.27% of the time with a CM of 7.78. Ninety-five percent of patients showed a significant improvement in CM after FFS.

Conclusions

This study illustrates that FFS changes the social perception of a patient’s gender. Patients after FFS are more likely to be identified as female and with greater confidence than before surgery. This is despite preoperative female hormone therapy, and nonsurgical methods that patients use to feminize their appearance.

Level of Evidence: 4
Coproducing Science to Inform Working Lands: The Next Frontier in Nature Conservation
Authors: Naugle David E , Allred Brady W , Jones Matthew O , Twidwell Dirac , Maestas Jeremy D
Published: November 2019

Conservationists are increasingly convinced that coproduction of science enhances its utility in policy, decision-making, and practice. Concomitant is a renewed reliance on privately owned working lands to sustain nature and people. We propose a coupling of these emerging trends as a better recipe for conservation. To illustrate this, we present five elements of coproduction, contrast how they differ from traditional approaches, and describe the role of scientists in successful partnerships. Readers will find coproduction more demanding than the loading dock approach to science delivery but will also find greater rewards, relevance, and impact. Because coproduction is novel and examples of it are rare, we draw on our roles as scientists within the US Department of Agriculture–led Sage Grouse Initiative, North America's largest effort to conserve the sagebrush ecosystem. As coproduction and working lands evolve, traditional approaches will be replaced in order to more holistically meet the needs of nature and people.
The Neural Basis for Response Latency in a Sensory-Motor Behavior
Authors: Lee Joonyeol , Darlington Timothy R , Lisberger Stephen G
Published: November 2019

We seek a neural circuit explanation for sensory-motor reaction times. In the smooth eye movement region of the frontal eye fields (FEFSEM), the latencies of pairs of neurons show trial-by-trial correlations that cause trial-by-trial correlations in neural and behavioral latency. These correlations can account for two-third of the observed variation in behavioral latency. The amplitude of preparatory activity also could contribute, but the responses of many FEFSEM neurons fail to support predictions of the traditional “ramp-to-threshold” model. As a correlate of neural processing that determines reaction time, the local field potential in FEFSEM includes a brief wave in the 5–15-Hz frequency range that precedes pursuit initiation and whose phase is correlated with the latency of pursuit in individual trials. We suggest that the latency of the incoming visual motion signals combines with the state of preparatory activity to determine the latency of the transient response that controls eye movement.

Impact statement

The motor cortex for smooth pursuit eye movements contributes to sensory-motor reaction time through the amplitude of preparatory activity and the latency of transient, visually driven responses.