bluuebunny/crossref_metadata_2025 huggingface dataset:
Aspects of the extension of forty exploitation of bulk reservoirs for irrigation and hydropower purposes
Authors: Bazarov Dilshod , Shodiev Bobur , Norkulov Boxodir , Kurbanova Umida , Ashirov Boyburi
Published: May 2019

The article is devoted to solving the problems of reducing the useful volume of bulk reservoirs, which is an urgent task of water management. The development of the design allows to reduce the volume of incoming sediment into the reservoir thicket is the main goal of the present work. The analysis of materials of field studies and a review of existing scientific works was the basis of the research method. The results of field studies on the study of channel processes in the downstream of the feeder channel of a low-pressure reservoir and the dynamics of their siltation. It has been established that the reservoirs accumulate only 0.3-10% of the annual river flow and the degree of annual silting of the capacity of such reservoirs is on average 0.5-2.0%. After 25-50 years, reservoirs may lose half of their usable capacity and after 40-80 years, a complete failure of operation is possible. To slow down this process in the basins of the self-leveling reservoirs, a new structure of structures developed, which ensures an even flow of water in the supply channel and maximum sedimentation of sediments in the channel, which prevents them from entering the reservoir bowl.
The change in the efficiency factor of the pumping unit with a frequency converter
Authors: Kan Eduard , Ikramov Nazir , Mukhammadiev Muradulla
Published: May 2019

This paper gives the results of the investigation of the operation of a pumping unit equipped with a frequency converter. As a rule, it is widely assumed that when changing the speed up to 50 %, the pump efficiency almost does not change, and the possibility of decrease of its efficiency is not taken into consideration when calculating the economic efficiency of the operation of the pumping unit equipped with a frequency converter. However, failure to take account the efficiency decrease may cause inaccurate assessment of the economic efficiency of the use of the frequency converter and, consequently, improper selection of the method of control of the operation of the pumping units. This is particularly important for irrigation pumping plants the operation of which is characterized by large volume of the pumpable volume and less severe requirements for provision of the water pressure required for the consumer. The purpose of this paper is to carry out experiments on a test-bed equipped with a pumping unit, parameter measuring instrument, and a frequency converter, and detection of the pattern of efficiency variation with speed. The paper presents the results of the carried out experiments, the obtained characteristic curves of the variation of different types of the efficiency at variation of the pump shaft speed, as well as their analysis.
Mathematical modeling of thermal technical characteristics of external protections with air layers
Authors: Mansurov Rustam , Rafalskaya Tatyana , Efimov Dmitry
Published: May 2019

A screened enclosing structure of the outer wall of the building without the use of thermal insulation materials is proposed. To ensure the required thermal resistance of the outer fence, screens (cement-containing slabs) and closed air gaps between them are used. Using the ANSYS software package, the heat transfer processes were modeled in a shielded building envelope, consisting of the main (carrier) part and screens with air gaps closed between them. The features of the heat transfer process in the thickness of the outer enclosure are revealed.
Computer simulation of oscillatory processes of viscoelastic elements of thin-walled structures in a gas flow
Authors: Khudayarov Bakhtiyar , Turaev Fozilzhon , Kucharov Olimzhon
Published: May 2019

Results of numerical investigation of dynamic behavior of deformed wing aircraft in a gas flow are presented in the paper. Vibrations with respect to deflections are described by a system of integro-differential equations in partial derivatives. Using the Bubnov-Galerkin method, the problem is reduced to a system of ordinary integro-differential equations, where time is an independent variable. The solutions of integro-differential equations are determined by a numerical method based on the use of quadrature formulas. Computational algorithms and a package of applied programs have been created to solve problems on nonlinear flutter of viscoelastic elements of an aircraft. The reliability of the solution of the problem is confirmed by comparison with known numerical and analytical results. The effect of different boundary conditions on critical flutter velocity is studied. Critical velocity and critical flutter time of viscoelastic plates are determined. It is shown that the singularity parameter α affects not only the vibrations of viscoelastic systems, but also critical time and critical flutter velocity. It is stated that consideration of viscoelastic properties of plate material leads to 40 60% decrease in critical flutter velocity.
Effect of thermal induced stress of concrete on performance characteristics of constructions
Authors: Pulyaev Ivan , Pulyaev Sergey , Bazhenov Yuri , Fetisova Anna , Shcherbeneva Olga
Published: May 2019

The article discusses issues related to determining and taking into account own thermally stressed state, which is formed in concrete during hardening, and is used to provide the required consumer properties of concrete during the construction of the Crimean bridge. It’s relevant in view of the tight construction timeframe for the said facility in rough terrain and hot climate. It is known that the location of a massive object in salty seawater, a hot climate, an increased seismic hazard, the presence of ice loads in the winter period of time, a large strait depth and other factors required a serious approach to ensuring the quality of concrete work and increasing the durability of the structure. The paper presents the results of own thermally stressed state of hardening concrete when determining the permissible temperature gradient in it, which made it possible to speed up the process of building the object while observing the necessary properties. This question seems relevant due to short deadlines, construction of the specified facility in adverse conditions, and also taking into account the development in our country construction of unique non-class objects.
Development of a three-tier system of parameters in the formation of the organizational and technological potential of using non-destructive testing methods
Authors: Lapidus Azariy , Khubaev Alan , Bidov Tembot
Published: May 2019

The efficiency potential of organizational and technological solutions using the methods of non-destructive testing of the strength of monolithic structures in the construction of civil buildings and structures has been investigated. In this article scientific and technical hypothesis was compiled. It consists in the assumption of the possibility of developing a system for evaluating the organizational-technological potential of using non-destructive testing methods based on the method of qualimetric analysis. The four most significant groups of parameters were identified on the basis of this method. They can have a significant impact on the organizational and technological potential of using non-destructive testing methods. The orthogonal central compositional plan was chosen as the basis for planning the experiment. This will reduce the number of experiments in the formation of the potential to 25, and to assess the degree of influence of each production and technological module in the implementation of the construction project. The system of variation of groups of parameters consisting of three levels was formed for the purpose of further research based on the tree of goals. The basis for the mathematical apparatus is prepared. This unit characterizes the parameters of the object.
Influence of slag-changing operation during LF refining on the inclusions in 82B high carbon steel wire
Authors: Dai Yuxiang , Li Jing , Shi Chengbin , Yan Wei
Published: May 2019

The influence of refining slag-changing operation on the compositions of 82B steel and inclusions were studied on the basis of plant trials combined with thermodynamic analysis. The optimized refining slag system for the refining of 82B steel was obtained through the plant experiments. The slag-changing operation had no effect on the type of oxide inclusions (CaO-SiO2-MnO-Al2O3) compared with the operation without slag-changing, whereas the CaO/SiO2 in inclusions decreased with the decrease of basicity of the top slag. The liquidus temperature of oxide inclusions were decreased with the slag-changing operation. The basicity of the refining slag should be controlled in the range of 2.5 to 3 at the early stage of LF in order to control the oxygen and sulfur in steel. At the later stage of LF refining, the basicity of refining slag should be changed to 1∼1.5, aiming to reduce the activity of [Al] in molten steel and target the good plasticity of oxide inclusions.
Electrolytes and its additives used in aluminum reduction cell: a review
Authors: Padamata Sai Krishna , Yasinskiy Andrey S. , Polyakov Petr V.
Published: May 2019

The electrolyte is considered to play the role of blood in an aluminum reduction cell and performs several vital functions as the charge transfer, the mass dissolution and transfer, the electrode products separation and the electrical work dissipation. The proper performance of listed functions is completely determined by the physical and chemical properties, which namely are the electrical conductivity, the viscosity, the vapor pressure, the liquidus and solidus temperatures, the density, the surface tension, the solubility and the dissolution rate of oxides, aluminum, carbon and the various connections and by operating conditions, which namely are the temperature, the current density, the anode-cathode distance, etc. The electrolyte affects the current efficiency and the cell voltage, which determines the specific energy consumption and the total cost of aluminum. This is the reason why different electrolytes and additives have been in the spotlight of the researchers and the enterprises for decades. This article presents the brief information about the influence of additives in the cell utilizing traditionally used sodium cryolite and different low-temperature electrolytes on physical-chemical properties and concentrates on the latest works which have not been included in widely known textbooks. The article also contains new experimental results obtained by the authors and devoted to the effective electrical conductivity of suspended unconventional electrolytes.
Manganese(III)-Based Oxidative Cyclization of N-Aryl-2-oxocyclo­alkane-1-carboxamides: Synthesis of Spiroindolinones
Authors: Katayama Shintaro , Nishino Hiroshi
Published: May 2019

The Mn(III)-based oxidative cyclization of twenty-five N-aryl-2-oxocycloalkane-1-carboxamides is investigated. The reactions progress efficiently to give the desired spiro[cycloalkane-1,3′-indoline]-2,2′-diones in high to quantitative yields. The easy conversion of the carbonyl functional group of one of the indoline products, 1′-methylspiro[cyclo­hexane-1,3′-indoline]-2,2′-dione, is also demonstrated.
Reconstruction of Post-Traumatic Orbital Defects and Deformities with Custom-Made Patient-Specific Implants: Evaluation of the Efficacy and Clinical Outcome
Authors: Chepurnyi Yurii , Chernogorskyi Denis , Petrenko Oksana , Kopchak Andrii
Published: May 2019

The main purpose of this article is to evaluate the efficacy of patient-specific implants (PSI) in treatment of patients with post-traumatic orbital defects and deformities. Twenty-three patients with post-traumatic orbital defects and deformities, who underwent subsequent reconstructive procedures using PSI, were included in the study. All the patients were examined according to the standard algorithm involving the local status examination, vision assessment, and computed tomography before and after surgery. The study findings show neither postoperative infectious complications nor decreased visual acuity or loss of visual fields. Functional disorders resolved in 65.2% of cases 1 month after the surgical intervention and in 86.96% of patients within a 3-month term. Positive aesthetic outcomes were seen in 95.7% of cases. Reconstruction with computer-aided design/computer-aided manufactured PSI is an effective procedure that allows accurate restoring of the complex orbital anatomy.
The Outcomes of Isolated Lateral Release in Patellofemoral Instability: A Systematic Review and Meta-Analysis
Authors: Tan Si Heng Sharon , Chua Chen Xi Kasia , Doshi Chintan , Wong Keng Lin , Lim Andrew Kean Seng , Hui James Hoipo
Published: May 2019

There have been conflicting reports regarding the outcomes of lateral release when used in the management of patellofemoral instability. This systematic review and meta-analysis therefore aims to evaluate the outcomes of isolated lateral release in the management of patellofemoral instability. The review was conducted using the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. All studies that reported the outcomes of isolated lateral release for recurrent patellofemoral dislocations were included. A total of 10 publications were included, with 204 knees. All studies consistently reported a decrease in the rates of patellofemoral dislocation (odds ratio [OR] < 0.01; 95% confidence interval [CI]: <0.01–0.01) and an increase in the odds of having a good outcome (OR 0.01; 95% CI: <0.01–0.02) after lateral release. All studies also consistently reported a similar number of patients participating in sports postoperatively as compared with preinjury (OR 2.78; 95% CI: 0.53–14.68). A total of 28 (14.1%) out of 198 patients had postoperative dislocation. Of these patients, 15 required a secondary procedure for patellofemoral realignment; however, all patients who had their eventual outcomes reported still had a good outcome postoperatively. Isolated lateral release can lead to good short- to middle-term outcomes when used in the management of recurrent patellofemoral dislocations. The procedure can lead to a significantly decreased rate of recurrence of patellofemoral dislocations, a significantly increased rate of good outcomes, and a similar number of patients being able to participate in sports as compared with the number of patients participating in sports prior to having patellofemoral dislocations. An isolated lateral release could therefore potentially serve as a simple and relatively low-risk procedure that could be performed as a first-line surgical management in selected patients with patellofemoral instability, allowing them to possibly avoid a more complex and major operation. This is a Level IV study.
Serial Evaluation of Haemostasis Following Acute Trauma Using Rotational Thromboelastometry in Cats
Authors: Muri Benjamin M. , Jud Schefer Rahel , Sigrist Nadja E.
Published: May 2019

Objective The aim of this study was to describe coagulation abnormalities and incidence of acute traumatic coagulopathy (ATC) in traumatized cats over the first 24 hours after admission.

Study Design This was a prospective observational study at the university teaching hospital including 26 cats with acute (<5 hours) trauma. Blood was sampled for rotational thromboelastometry (ROTEM) parameters at presentation and 6 hours/24 hours thereafter. Rotational thromboelastometry tracings were defined as hypo- or hypercoagulable if ≥ 2 of the following parameters were above or below institutional reference intervals: clotting time, clot formation time (CFT), maximum clot firmness, maximum lysis or maximum clot elasticity. Hypocoagulability at presentation was defined as ATC. Injury severity scores, treatment and survival to hospital discharge were retrieved from patient records.

Results The incidence of ATC was 15% and the most common ROTEM abnormalities in cats with ATC were clotting time and CFT prolongation in both extrinsic and intrinsic ROTEM profiles. After 24 hours, compared with presentation, significantly more cats were hypercoagulable (p = 0.047) and none of the cats showed hypocoagulopathy. Cats with ATC received significantly more blood transfusions (p = 0.008).

Conclusion The incidence of ATC in cats is higher than previously reported. Clotting time and CFT prolongations seem to be more common than hyperfibrinolysis and 53% of the cats became hypercoagulable within 24 hours. While the clinical relevance of ATC in cats needs to be investigated, cats diagnosed with ATC required significantly more blood transfusions.
Effect of the Dog positioning on X-Ray Table on Hip Dysplasia Parameter Evaluation
Authors: Martins João , Colaço Bruno , Alves-Pimenta Sofia , Gonzalo Orden José M. , Ferreira António J. , Ginja Mário M.
Published: May 2019

Objective The aim of this study was to evaluate the effect of pelvic tilting along the long axis and femoral rotation on Norberg angle (NA), subluxation index (SI) and subluxation category (SC) in the standard ventrodorsal hip extended (VDHE) radiographical view on live animals.

Study Type This was a retrospective clinical study.

Materials and Methods Pairs of VDHE views, one adequately positioned and the other with pelvic tilting or femoral internal or external rotation, were compared for the NA, SI and SC.

Results On the malpositioned pelvis set, on the underside the mean ± SD NA was 98.7 ± 6.1°, the SI was 0.27 ± 0.12 and the SC was 2.8 ± 0.8 versus, on the acceptable set, the NA was 99.2 ± 6.4° (p > 0.05), the SI was 0.25 ± 0.12 (p < 0.05) and the SC was 2.3 ± 0.9 (p < 0.05); on the malpositioned upperside, the NA was 102.1 ± 6.4°, the SI was 0.21 ± 0.14 and the SC was 1.7 ± 1.1 versus, on the acceptable positioned set, the NA was 100.8 ± 6.7° (p < 0.05), the SI was 0.24 ± 0.15 (p < 0.05) and the SC was 2.3 ± 1.2 (p < 0.05). Femoral internal or external rotation sets did not show significant differences between malpositioned and acceptable positioned sets (p > 0.05).

Conclusions In clinical practice, pelvic tilting along the long axis in VDHE view results in non-favourable hip changes in the NA, SI and SC on the underside and favourable on the upperside, and the internal or external femoral rotation did not affect these variables.
Effect of Neonatal Phototherapy on Eosinophil Levels in Nonsevere Hyperbilirubinemia
Authors: Can Ceren , Hamilcıkan Şahin
Published: May 2019

Objective The purpose of the research was to determine the impact of phototherapy (PT) on eosinophil levels in neonates with nonsevere bilirubin levels (<20 mg/dL) treated with PT.

Study Design This observational pilot study included term neonates with early neonatal hyperbilirubinemia.

Results Ninety-six term neonates were included in the study. The male-to-female ratio was 1.23. Hyperbilirubinemia was most frequently related to ABO group incompatibility (49%). Fifty-two neonates (54.1%) were born by normal spontaneous delivery. After PT, while total serum bilirubin, hemoglobin, hematocrit, leukocyte, and neutrophil levels were found to be significantly decreased, eosinophil levels were significantly increased (p = 0.01). No significant difference was found regarding lymphocyte and basophil levels after PT. A statistically significant correlation was found between bilirubin and eosinophil levels before PT (r
2 = 0.28, p = 0.03). No correlation between eosinophil levels and treatment age, gender, diagnosis of hyperbilirubinemia, and delivery route before PT was found. After PT, eosinophil levels increased, while other blood cell series were found to be decreased. The correlation between the bilirubin levels and eosinophil was found to be negative (r
2 = − 0.32, p = 0.02) after PT.

Conclusion PT may increase serum eosinophil levels in term neonates with nonsevere hyperbilirubinemia.
Rarely Seen Poland–Moebius Syndrome: A Comprehensive View with Perspective of Pediatric Neurology
Authors: Havalı Cengiz , Saymazlar Dilek Damla , Öztürk Zeynep
Published: May 2019

Background Moebius syndrome is a rare congenital disorder characterized by a unilateral or bilateral congenital facial weakness with impairment of ocular movements. Poland syndrome is an occasional disease defined as the unilateral absence of pectoralis major muscle and ipsilateral syndactyly. As to, Poland–Moebius syndrome is a rare condition which consists of assembly components of Poland and Moebius syndromes.

Patients and Methods Patient 1 is a 12-year-old male patient referred for evaluation of difficulties in eye movements to the hospital. On admission, facial, abducens, trochlear, and oculomotor cranial nerves involvement was determined in the neurological examination. His right pectoralis major muscle was hypoplastic in the examination. Patient 2 is a 4-month-old female patient who was admitted with restricted eye movements, weakness of crying, and difficulty in swallowing. Neurological examination indicated facial, abducens, trochlear, oculomotor, glossopharyngeal, and vagus cranial nerves involvement. Her physical examination demonstrated hypoplastic left pectoralis major muscle and hypoplastic left hand.

Results The biochemical laboratory studies, creatinine kinase levels, and tests for inborn error of metabolism of both patients were normal. Chest X-ray studies revealed the lack of muscle tissue development in the left pectoral region. Cranial magnetic resonance imaging, echocardiography, and abdominal ultrasound were also normal.

Conclusion This report highlights two cases of Poland–Moebius syndrome in two patients of varying age and clinical presentations, with a comprehensive review from the perspective of pediatric neurology.
Numerical simulation of the interaction of two shear layers in double backward-facing steps
Authors: Deng Fang , Han Guilai , Liu Meikuan , Ding Jue , Weng Peifen , Jiang Zonglin
Published: May 2019

In this paper, Navier-Stokes equations were solved with high-order accurate schemes to investigate the basic structure and regularity of the flow field during the interaction of a supersonic jet and a codirectional supersonic incoming flow. A double backward-facing step model was proposed to investigate the interaction between the jet/supersonic incoming flow shear layers. The two shear layers interact to produce a secondary jet. The secondary jet produced by the action has a unique periodicity that is related to the overall oscillation of the shear layer. The secondary jet is generated when the horizontal angle of the jet shear layer reaches a certain value. This paper focused on the analysis and discussion of the periodicity of the secondary jet. When the aspect ratio is different, the period of the secondary jet changes significantly. However, when the static pressure ratio is different, the period of the secondary jet does not change much.
The influence of dipolar particle interactions on the magnetization and the rotational viscosity of ferrofluids
Authors: Rosa A. P. , Cunha F. R.
Published: May 2019

The effect of the dipolar particle interactions on the behavior of ferrofluids under a shear flow is not yet well understood. The equilibrium magnetization in the absence of flow is studied in Paper I [A. P. Rosa, G. C. Abade, and F. R. Cunha, “Computer simulation of equilibrium magnetization and microstructure in magnetic fluids,” Phys. Fluids 29(9), 092006 (2017)]. In this paper, we present the results of magnetization and rheology in terms of a rotational viscosity obtained by applying Brownian dynamics simulations for a periodic magnetic suspension, where the many body long-range dipole-dipole interactions are calculated by the Ewald summation technique. The dependence of these macroscopic properties on the dipolar interactions is explored in ferrofluids undergoing both weak and strong shear flows in the presence of a uniform magnetic field. Through the simulations, the suspension microstructure is also analyzed in order to characterize the interplay between the structure and the investigated macroscopic properties. We show that for weak shear flows the dipole-dipole interactions produces a magnetization increasing. In contrast, a decrease in the ferrofluid magnetization with the shear rate is substantially intensified as the dipolar interactions are accounted for. Therefore, for strong shear flows, the dipolar interactions always have an effect of decreasing magnetization. In addition, while the dipolar particle interactions produce an increase in the rotational viscosity for weak flows, variations in the same property are not perceptible under the condition of strong flows. The numerical simulations show chain-structure formation oriented in the direction of the magnetic field (i.e., perpendicular to the direction of the shear) for weak flows, which explains the remarkable increasing of the suspension rotational viscosity as a function of the applied magnetic field and of the dipolar interactions parameters. A detailed comparison shows that our simulation results of magnetization and the rotational viscosity are in excellent agreement with approximate theoretical predictions reported in the literature for the case of noninteracting particles.
Ceiling effects on the aerodynamics of a flapping wing at hovering condition
Authors: Meng Xueguang
Published: May 2019

The ceiling effect on the aerodynamics of a hovering flapping wing is investigated by solving the three-dimensional incompressible Navier-Stokes equations. Computations have been carried out for some parameters including the distance between the wing and the ceiling, the Reynolds number, the stroke amplitude, and the mid-stroke angle of incidence. The ceiling effect on the force production and vortical structures around the wing is analyzed. It is shown that the ceiling effect increases the aerodynamic forces. This improvement in force production in the ceiling effect is caused by the increments both in the relative velocity of oncoming flow and the effective angle of attack of the wing. The underlying mechanism is that the presence of the ceiling acts as a mirror as if there exists a mirroring leading-edge vortex (LEV). This mirroring LEV not only increases the relative velocity of the oncoming flow ahead of the wing but also produces an upwash to the oncoming flow, hence increasing the effective angle of attack of the wing.
Phosphoproteomic and proteomic profiling of serine/threonine protein kinase PkaE of Streptomyces coelicolor A3(2) and its role in secondary metabolism and morphogenesis
Authors: Hirakata Toshiyuki , Urabe Hiroaki , Sugita Takashi
Published: May 2019

This study aimed to investigate the role of serine/threonine kinase PkaE in Streptomyces coelicolor A3(2). Liquid chromatography tandem mass spectrometry was performed for comparative phosphoproteome and proteome analyses of S. coelicolor A3(2), followed by an in vitro phosphorylation assay. Actinorhodin production in the pkaE deletion mutant was lower than that in wild-type S. coelicolor A3(2), and the spores of the pkaE deletion mutant were damaged. Furthermore, phosphoproteome analysis revealed that 6 proteins were significantly differentially hypophosphorylated in pkaE deletion mutant (p < 0.05, fold-change ≤ 0.66), including BldG and FtsZ. In addition, the in vitro phosphorylation assay revealed that PkaE phosphorylated FtsZ. Comparative proteome analysis revealed 362 differentially expressed proteins (p < 0.05) and six downregulated proteins in the pkaE deletion mutant involved in actinorhodin biosynthesis. Gene ontology enrichment analysis revealed that PkaE participates in various biological and cellular processes. Hence, S. coelicolor PkaE participates in actinorhodin biosynthesis and morphogenesis.
Protective effect of Mori Cortex radicis extract against high glucose-induced oxidative stress in PC12 cells
Authors: You Sohyeon , Kim Gun-Hee
Published: May 2019

This study was undertaken to investigate the neuroprotective effect of an ethanolic extract of Mori Cortex radicis (MCR) against high glucose (HG)-induced oxidative damage in PC12 cells. Cell cytotoxicity was examined using MTT and lactate dehydrogenase assays. To examine the antioxidative effects, intracellular reactive oxygen species (ROS) and malondialdehyde (MDA) levels and the activities of antioxidant enzymes were measured. The expressions of apoptosis-associated proteins were assessed. MCR was found to increase the viabilities of HG-induced PC12 cells and to inhibit ROS and MDA production and to promote antioxidative enzyme activities. Furthermore, MCR reduced apoptosis by upregulating p-Akt and Bcl-2/Bax ratio and reducing cytochrome c level. The main flavonoids in MCR were identified by HPLC to be kuwanon G and morusin. These results suggest the antioxidative effects of MCR protect against HG-induced oxidative stress and that MCR has potential therapeutic use for the prevention and treatment of diabetic neuro-degeneration.
Excluding scientist survivors from the NASEM Action Collaborative is a step backward in changing culture to prevent sexual harassment
Authors: Gordon Sharona E.
Published: May 2019

By excluding scientist survivors from leadership of the Action Collaborative, the NASEM undermines its goal of positive culture change to reduce sexual harassment.
Research on Accurate Positioning of Indoor Objects Based on ROS and 3D Point Cloud
Authors: Yu Yang , Piao Yan , Ni Yan , Si Tongling
Published: May 2019

Due to the small environmental limitations of GPS satellite positioning and the complexity of the indoor environment, indoor object location technology has the opportunity to display its talents. Considering that the map constructed by ROS SLAM can only describe the two-dimensional information of the environment, the three-dimensional point cloud image can only describe the independent three-dimensional information of the object. This paper combines the indoor 2D map and the 3D point cloud image information of the object constructed by Gmapping algorithm and proposes a composite coordinate positioning system. The whole positioning experimental data has shown that the average measurement error of the position in the object room is only 4.2cm, and its positioning accuracy is 6.7% higher than that of the common ultrasonic and infrared positioning system[1], and the positioning accuracy of the positioning system based on Bluetooth angle measurement[2] is improved by 20% compared with ultra-wideband[3]. Positioning system increased by 72%. The object positioning error is small and the positioning is accurate.
A Robust Feature-processing Method for Age-invariant Face Recognition
Authors: Hou Xiaonan , Qiu Xuetao , Wan Sishuang , Tang Tao
Published: May 2019

In this paper, we present a novel feature-processing method for age-invariant face recognition so that it is robust to aging process. The main purpose of feature-processing is to remove aging effects while keep personalized properties stable simultaneously. In order to achieve this, we try to learn a space map and then encode the mapped feature to an age - invariant representation. In the encoding step, we introduce two kinds of constraints: the temporal constraint (local constraint) and boundary constraint (global constraint). We applied our feature-processing method to Cross-Age Celebrity Dataset (CACD). In order to verify the versatility of our method, we apply it to both high-dimensional LBP feature and deep feature. Results show that our feature-processing method works well on CACD and the face verification subset of CACD (CACD-VS).
Virtual Ship Environment Creation Method
Authors: Rukai Zhang
Published: May 2019

Based on the real ship structure and equipment, the game engine is used to construct a three-dimensional visual model scene. Multigen Creator will be used to model, and after format conversion, the model will be driven by Unity 3D to complete the virtual ship platform construction. By introducing control logic such as roaming logic and navigation logic, the user is allowed to perform operations such as roaming and navigation in the virtual scene. The system has the characteristics of strong sense of reality, friendly interface, and interaction, which meets the needs of information teaching. With the cross-platform features of Unity3d, PC and mobile programming are respectively carried out to realize the network development of VR training platform.
TDMA Device Identification Using Continuity of Carrier Phase
Authors: Pan Y , Peng H , Li T , Wang W
Published: May 2019

Specific emitter identification provides the capability to distinguish radio emitters with the external features carried by the received waveforms. As existing features are not specific to time-division multiple access (TDMA) devices, it is yet intractable to discern the emitter in the case of low signal-to-noise rates or short durations. In this paper, we propose a novel characteristic based on the continuity of carrier phase and explore its application on TDMA device identification. The characteristic reflects a fact whether adjacent time slots are assigned to the same user terminal, which reveals a potential link between slots even if the protocol is unknown. To apply it to TDMA device identification, we augment the typical SEI scheme with two subsystems, Decision and Correction, in which the recognition results can be corrected to improve the accuracy. Simulation results demonstrate that the characteristic is resilient against the ambient noise, and it evidently improves the recognition accuracy.
Application of Sparse Dictionary Adaptive Compression Algorithm in Transient Signals
Authors: Ailun Zhang , Han Tailin
Published: May 2019

An adaptive compression algorithm based on sparse dictionary is proposed to solve the pressure on the transmission system caused by long-time high sampling rate sampling of transient signals. Due to the obvious difference between transient and non-transient information features of transient signals. According to the sparse dictionary construction characteristic that the more matching atoms and signal features are, the better sparse performance is, the transient signal feature information is extracted and compressed separately. After data compression, the principle of compressed sensing is applied to restore the transient signal, so as to reduce the amount of data transmitted in the transmission system. In summary, the adaptive sparse dictionary compression algorithm effectively compresses the transient signal data, and the compressed data can accurately recover the transient signal.
Feature Points Matching Algorithm based on Homography Constraint and Gray Scale Truncation Number
Authors: Wu Ruo , Wang Kun , Ma Jiquan
Published: May 2019

A measure function is used to judge whether match in boost matching. In this paper, we offer a kind of new measure function called GST. We simply use the relationship between gray differences and threshold of the points of domain tests the matching degree. We use homography and GST to improve the number and precision of correspondences of SIFT matching. Firstly, homography is estimated using the result of SIFT matching by VRANSAC. Then, wrong correspondences are eliminated by homography. Finally, we use GST and homography to boost matching the wrong correspondences. Experiments with the Oxford datasets show that our method can get better performance than the existed methods.
A Recommendation Algorithm Based on Item Genres Preference and GBRT
Authors: Wang Yuan , Tang Yan
Published: May 2019

The most mature and widely used collaborative filtering algorithm is facing the problem of data sparsity, which is not conducive to the acquisition of user preferences, thus affecting the recommendation effect. Introducing item genres into recommendation algorithm can reduce the impact of data sparsity on recommendation effect. The personalized preferences of users can be extracted more effectively from the preference information of item genres, and the recommendation accuracy can be further improved. On this basis, this paper proposes a recommendation algorithm based on item genres preference and GBRT, which divides similar users by K-means clustering algorithm, extracts user preferences of item genres and auxiliary features, and establishes a rating prediction model combined with GBRT algorithm. The experiments on the common datasets of Movie Lens 100K and Movie Lens 1M show that the proposed algorithm achieves 0.8%-7% optimization on the evaluation index MAE, which indicates that the impact of data sparsity is reduced to a certain extent and the recommendation efficiency is better than the existing recommendation algorithm.
An Effective Text Classification Model Based on Ensemble Strategy
Authors: Hong Zhu , Wenzhen Jin , Guocai Yang
Published: May 2019

Automatic text classification is a classic topic for natural language processing. Text classification research mainly focuses on feature representation of text documents or designing an efficient machine learning model. Although various approaches have been proposed to address these problems, they are still far from being solved. In this paper, we proposed a novel method called LAC_DNN to achieve the text classification based on diverse feature representation approaches and classifiers. More specifically, LAC_DNN firstly introduces a novel feature representation approach called LATW to extract feature information of the documents, which integrates the feature information extracted by LSI model, TF-IDF weighted vector space model (TF-IDF_VSM), TF-IDF weighted word2vec (TF-IDF_word2vec) and average word2vec (Avg_word2vec), respectively. Secondly, it trains different classifiers including support vector machine, k nearest neighbor, logistic regression and convolutional neural networks based on the feature encoded by LATW. Finally, LAC_DNN integrates these classifiers into an ensemble predictor to leverage complimentary information of feature representation methods and classifiers, and predict the topic of text documents. LAC_DNN achieves superior performance with accuracy of 97.44% and 97.43% on the text datasets of Fudan and Netease news, respectively. Extensive experiments show that LAC_DNN is prominent and useful for text classification.
Detection and Implementation of Driver’s Seatbelt Based on FPGA
Authors: Tianshu Wu , Zhijia Zhang , Zhanning Liu , Yunpeng Liu , Shixian Wang
Published: May 2019

In this paper, the driver’s seatbelt detection algorithm is transplanted to the PYNQ embedded platform of XILINX to meet the technical requirements of automatic identification and detection of whether the driver wears a seatbelt or not. In this paper, aiming at the characteristics of the hardware of the FPGA, the driver’s seatbelt detection algorithm is realized by IP core from XILINX open source. Vehicle detection is realized by using YOLO object detection algorithm with 3 bit weight and 1 bit activation, and driver’s seatbelt classification is realized by using binary model with 1 bit weight and 1 bit activation. On the PYNQ embedded hardware of XILINX, the acceleration of the algorithm is realized by calling the hardware of FPGA on the ARM side.
Time Delay Recurrent Neural Network for Speech Recognition
Authors: Liu Boji , Zhang Weibin , Xu Xiangming , Chen Dongpeng
Published: May 2019

In Automatic Speech Recognition(ASR), Time Delay Neural Network (TDNN) has been proven to be an efficient network structure for its strong ability in context modeling. In addition, as a feed-forward neural architecture, it is faster to train TDNN, compared with recurrent neural networks such as Long Short-Term Memory (LSTM). However, different from recurrent neural networks, the context in TDNN is carefully designed and is limited. Although stacking Long Short-Term Memory (LSTM) together with TDNN in order to extend the context information have been proven to be useful, it is too complex and is hard to train. In this paper, we focus on directly extending the context modeling capability of TDNNs by adding recurrent connections. Several new network architectures were investigated. The results on the Switchboard show that the best model significantly outperforms the base line TDNN system and is comparable with TDNN-LSTM architecture. In addition, the training process is much simpler than that of TDNN-LSTM.
Assessment on tunnel lining to ensure stability in soft ground
Authors: Mohd Muhtar Noor Iman Safiya , Norafida Jusoh Siti , Yusufiansyah Dedy , Alel Asmawisham , Mohd Yunus Nor Zurairahetty , Asnida Abdullah Rini , Mashros Nordiana
Published: May 2019

Soft ground tunnelling describes as additional measures that are needed to be taken as it has been associated with settlement due to changes of stress and strength of the soil induced by tunnelling. Segmental tunnel lining is a structure used to support the ground and to have allowable movement due to soil stress redistribution. The research will be focusing on the type of modelling, structure parameter of the tunnel, pressure upon the tunnel lining and relationship with the induced ground settlement. Tunnel modelling was done in three dimensional (3D) modelling using ABAQUS software; of tunnel as parameter. This paper will discuss the effect of jack forces to the global behavior of the tunnel in order to support the surrounding load, thus be able to handle the tunnel-soil reaction without any visible or critical deformation, so that the tunnel can be used in the stable condition. A stand-alone ring method together with all-in-once method was used to simulate the Singapore MRT Circle Line 3 (CCL3). In the findings, when the tunnel lining thickness is reduced, the settlement of the ground surface is increased. Jack forces is also one of the reason of the tunnel to distort and the effect is more visible on the rings with reduced thickness compared to original thickness of the tunnel lining.
Collapse settlement of unsaturated soil from effective stress and shear strength interaction of soil
Authors: Mohamed Jais I B , Md. Noor M J
Published: May 2019

Consolidation settlement is the volume change behaviour due to dissipation of excess pore water pressure in saturated conditions. However, in a partially saturated condition, suction plays an important role in governing settlement behaviour. Besides, it also influences the shear strength of the soil by providing additional cohesion (termed apparent cohesion, cs) due to the existence of suction in the shear strength against suction axis. The shear strength decreases as the soil becomes fully saturated i.e. suction is reduced to zero, thence causes the apparent cohesion reduced to zero. Apparently, the shear strength has strong influence on the volume change behaviour. Therefore, a comprehensive review of the effective stress and shear strength interaction was conducted to verify this. The objective of this research is to verify the effective stress and shear strength interaction for both saturated and unsaturated soil conditions and to evaluate the complex settlement behaviour due to inundation at constant net stress, which has puzzled geotechnical practitioners. These conditions are tested and verified using the double wall triaxial test apparatus to determine the unsaturated shear strength of soil, the pressure plate extractor to produce Soil Water Characteristic Curve (SWCC) and modified large Rowe’s cell apparatus to simulate the loading and wetting collapses of partially saturated soils.
Shape of the in-situ (Al, Zn)-Ti reinforcing particles and their influence on structure and structural stability of selected Zn-Al and Al-Zn cast alloys
Authors: Krajewski P K , Greer A L , Krajewski W K
Published: May 2019

The foundry engineering still needs new cast materials of improved properties. These can be achieved by elaborating completely new alloys and metal matrix composites or by elaborating the alloys/composites basing on the already very well-known matrixes. The good example of the latter solution are high-aluminium zinc (H-Al Zn) and high-zinc aluminium cast alloys (H-Zn Al). Both of these groups show good damping and strength properties but rather low ductility and insufficient structural (and dimensional) stability, caused by long term transformation of the Cu-containing bearing phases. The performed works were devoted, among others, to building composites of improved structural stability reinforced with ternary (Al, Zn)-Ti aluminides. The in-situ reinforcement was built by needle-shape ternary aluminides based on the DO22 TiAl3 binary phase introduced with AlTi-based master alloys or by compacted semi-globular ones based on the L12 Zn3Ti particles introduced with a ZnTi-based master alloy. The mentioned particles substitute partly or totally for Cu-based bearing phase and the influence of this substitution on the structural stability and tribological properties is also discussed in the paper.
A remark on the non-compactness of 𝑊^{2,𝑑}-immersions of 𝑑-dimensional hypersurfaces
Authors: Li Siran
Published: May 2019

We consider the continuous

W

2
,
d

W^{2,d}

-immersions of

d
d

-dimensional hypersurfaces in

R

d
+
1

\mathbb {R}^{d+1}

with second fundamental forms uniformly bounded in

L
d

L^d

. Two results are obtained: first, we construct a family of such immersions whose limit fails to be an immersion of a manifold. This addresses the endpoint cases in J. Langer [Math. Ann. 270 (1985), pp. 223–234], and P. Breuning [J. Geom. Anal. 25 (2015), pp. 1344–1386]. Second, under the additional assumption that the Gauss map is slowly oscillating, we prove that any family of such immersions subsequentially converges to a set locally parametrised by Hölder functions.
Rice Consumption and Subclinical Lung Disease in US Adults: Observational Evidence From the Multi-Ethnic Study of Atherosclerosis
Authors: Sanchez Tiffany R , Oelsner Elizabeth C , Lederer David J , Lo Cascio Christian M , Jones Miranda R , Grau-Perez Maria , Francesconi Kevin A , Goessler Walter , Perzanowski Matthew S , Barr R Graham , Navas-Acien Ana
Published: May 2019

Rice accumulates arsenic, an established lung toxicant. Little is known about the association of rice consumption with arsenic-related health effects, particularly interstitial lung disease. Between 2000 and 2002, 6,814 white, black, Hispanic, and Chinese adults from 6 US cities were enrolled in the Multi-Ethnic Study of Atherosclerosis. We included 2,250 participants who had spirometry data, 2,557 with full-lung computed tomography (CT) scans, and 5,710 with cardiac CT scans. Rice consumption and 310 participants with urinary arsenic were assessed at baseline. Spirometry and full-lung CT-derived measures of total lung capacity and high attenuation area (HAA), and interstitial lung abnormalities were measured at examination 5. Cardiac CT-derived HAA was measured at 1–3 visits. Twelve percent of participants reported eating at least 1 serving of rice daily. Comparing data between that group with those who ate less than 1 serving weekly, the mean difference for forced vital capacity was −102 (95% confidence interval (CI): −198, −7) mL, and for forced expiratory volume in 1 second was −90 (95% CI: −170, −11) mL after adjustment for demographics, anthropometrics, dietary factors, and smoking. The cross-sectional adjusted percent difference for total lung capacity was −1.33% (95% CI: −4.29, 1.72) and for cardiac-based HAA was 3.66% (95% CI: 1.22, 6.15). Sensitivity analyses for urinary arsenic were consistent with rice findings. Daily rice consumption was associated with reduced lung function and greater cardiac-based HAA.