bluuebunny/crossref_metadata_2025_split huggingface dataset:
Assessment of growth performance, nutrient utilization and haematological profile of Clarias gariepinus fed with nanoselenium formulated diets
Authors: Owolabi OD , Babarinsa MK 
Published: June 2020

Abstract
A 63-day experiment was conducted to determine the effects of nanoselenium formulated diets on growth performance, nutrient utilization and haematological profile of Clarias gariepinus. Fish were acclimatized for 14 days, 10 fish each were randomly introduced into different troughs. Feed supplemented with nanoselenium at 2 mg/kg, 4 mg/kg and the control without nanoselenium were fed to group of fish each in triplicate. The feed intake, weight gain, food conversion ratio (FCR), specific growth rate (SGR), protein efficiency ratio (PER) and survival rate (SR) were determined, also the haematological profile of Clarias gariepinus fed were analyzed. There were significant increase (p<0.05) in the weight gain of fish fed 2 mg/kg of nanoselenium as compared with those fed 4 mg/kg of nanoselenium and the control. Similarly, PER and SR were significantly higher (p<0.05) in 2 mg/kg when compared with other formulated diets. The FCR of fish fed 2 mg/kg was significantly lower compared with 4 mg/kg nanoselenium formulated diets. WBC, RBC, haemoglobin, and haematocrit significantly increased in fish fed 2 mg/kg of nanoselenium as compared with those fed 4 mg/kg nanoselenium and the control group while there was variation in the values of other haematological parameters such as platelets, MCV, MCH and MPV. The research indicated that dietary inclusion of nanoselenium at 2 mg/kg may enhance better growth performance and nutrient utilization of Clarias gariepinus.
Recent developments on the photoanodes employed in dye-sensitized solar cell
Authors: Shittu H A , Bello I T , Kareem M A , Awodele M K , Sanusi Y K , Adedokun O 
Published: June 2020

AbstractThe emergence of dye sensitized solar cell (DSSC) as an alternative device for silicon based solar cell has gained a lot of attention from researchers due to its cost-effective, easy fabrication and environmentally friendliness. Photoanodes are semiconductor and as one of the four components of DSSC plays a major role for dye loading and electron conduction. A good photo anode should provide an efficient surface area in dye loading, nanostructure for high light harvesting opportunity, fast electron transport ability and good band gap architecture. Several nanostructures materials have been studied and employed as photoanode in DSSC. They include TiO2, ZnO, Nb2O5, SnO2, among others. The problem associated with photoanodes used in fabricating DSSC is high recombination rate of electrons that emanate from the number of grains. The dispersed nature of progress reports on developments of photoanodes calls for summary. Hence this review gives a general summary of the progress made in various materials used as photoanode in DSSC and the methods adopted in synthesizing them. In this present review, our attention is not only on synthesis and characterization of the materials alone but also on the effect of different factors influencing photovoltaic characteristics of photoanode for DSSC application.
Surface sterilization of Ocimum seeds and tissues with biosynthesized nanosilver and its effects on callus induction
Authors: Adebomojo AA , AbdulRahaman AA 
Published: June 2020

Abstract
Plant tissue culture is a basic and fundamental component of plant biotechnology. Nowadays, nanomaterials especially nanosilver (NS) are being used as an antimicrobial agents for surface sterilization of explants in tissue culture. In this study, biosynthesized nanosilver (BNS) was used for the surface sterilization of Ocimum seeds and tissues and its effects on callus induction were evaluated. The seeds and tissues were exposed to different concentrations of BNS (10, 50 and 100 mg/l) as well as 5% Clorox for five exposure times (5, 10, 20, 30 and 60 min) and effects on germination, callus induction and surface sterilization were determined. The BNS was found very effective on surface sterilization as 100% decontamination was achieved with no adverse effect on explant viability and callus formation but rather had stimulating effect on formation of callus. The study concluded that BNS can be used as an antimicrobial agent in surface disinfection of explants therefore extending the frontiers of the potential application of biosynthesized nanosilver in tissue culture.
Experimental study, phenomenological and adaptive neuron analysis of creep property of Momordica augustisepala L nanofiber reinforced polyvinyl alcohol polymer film composite
Authors: Adeyi A J , Durowoju M O , Adeyi O 
Published: June 2020

Abstract
The viscoelastic property of packaging material affects foods’ postharvest management and biophysical quality preservation of food. This study investigated the creep viscoelastic property of neat polyvinyl alcohol film and polyvinyl alcohol film reinforced Momordica augustisepala nanofiber composite. The applicability and comparison of Burger phenomenological and Adaptive neuron model to analyze the creep data were investigated. The instantaneous modulus and creeping speed of neat and reinforced polyvinyl alcohol were 7.53710 MPa, 10.27580 MPa and 3.00590 MPa.s, 2.85391 MPa.s, respectively. The coefficient of determination of Burger model prediction was 0.99889 and 0.99972 for neat and composite polyvinyl alcohol film, while the coefficient of determination of Adaptive neuron model was 0.99986 for both neat and reinforced polyvinyl alcohol film. The Momordica augustisepala nanofiber improved the creep viscoelastic property of polyvinyl alcohol film and Adaptive neuron model showed superiority over Burger model in prediction of experimental data. The results are vita in material design, life prediction and usage prescription.
Isolation and characterization of cellulose nanofibres from three common Nigerian grasses
Authors: Ejeta KO , Azeez TO , Banigo AT , Nkuma-Udah KI , Ajuogu E 
Published: June 2020

AbstractNanocellulose may be in nanocrystal or nanofibre form which may be extracted from purified cellulose by different methods. These include methods like dual-opposite-spinneret electrospinning, mechanical methods, a combination of chemical and mechanical methods, cryocrushing and enzymatic approaches. Nitrocelluloses have been extracted from various plants but not much has been reported on the yield from grasses. In this study, cellulose nanofibres (CNFs) were extracted from three common grasses;Pennisetum purpureum, Cynodon dactylonandAxonopus compressusby formic acid hydrolysis with the micrograph of CNF for each grass obtained. The CNFs are web-like long fibrous structure with diameter ranging between 3 to 5 nm and yield of over 75%. The crystallinity index averaged 76% and the onset temperature of thermal decomposition was 199 °C. Thus,Pennisetum purpureum, Cynodon dactylonandAxonopus compressusare good eco-friendly sources of CNF for potential application as new source of nanofillers for reinforcement of nanocomposite films.
Facile synthesis of silver nanoparticles using leaf extract of Hyptis suaveolens (L.) Poit for environmental and biomedical applications
Authors: Lateef A , Oladejo S M , Akinola P O , Aina D A , Beukes L S , Folarin B I , Gueguim-Kana E B 
Published: June 2020

Abstract
Aqueous leaf extract of Hyptis suaveolens was investigated to synthesize silver nanoparticles (Hs-AgNPs). Biomolecules such as phenolics, proteins, carbohydrates and esters facilitated bioformation of Hs-AgNPs with ƛmax at 420 nm. The nearly spherical Hs-AgNPs were polydispersed and sized 29.19-52.27 nm with yield of 85.8 %. Hs-AgNPs showed potent inhibition of 75.22-100 % against multidrug resistant bacteria, and fungal growth inhibition of 73.33-100 %. Hs-AgNPs scavenged DPPH and H2O2 by 77.75-83.19, and 54.21-70.11 % respectively. It also effectively inhibited coagulation of blood. The study established the nanobiotechnological importance of H. suaveolens, with bioformation of AgNPs that have potent activities for environmental and biomedical applications.
Fibrous Orientation Effects on the Deformation and Stress of a Pigeon-like Flapping-wing Micro Aerial Vehicle Based on APDL
Authors: Atik Morshed A K M , Yu Chunjin , Wang Fang 
Published: June 2020

Abstract
Fibrous orientation effects on the deformation and stress of a bird-like (pigeon) composite wing was studied. The bird wing is simulated and modeled by mechanical APDL software. The stress and displacement results of bird wing model under different laying modes are obtained by finite element method. The optimal laying mode is analyzed. The results are checked by strength theory in composite mechanics. The results show that for singe orientation [-20]4 is the best orientation. For 4 layers structure, [-45/90/0/45] has best performance in 1st layer while [45/0/-45/90] has worst performance; [0/-45/90/45] has best performance in 2nd layer while [0/45/-45/90] has worst performance. [45/90/-45/0] has best performance for pigeon wing in this design in 3rd layer while [-45/0/90/45] has worst performance. [45/0/90/-45] has best performance for pigeon wing in this design in 4th layer while [-45/90/0/45] has worst performance. By comparison, it is found that the different-direction pavement is better than the same-direction pavement.
A Novel Hand Pallet Truck and Multi-objective Optimization Design of It’s Lifting Mechanism
Authors: Yang Bo , Yuan Jianhui , Chen Min , Yu Fenhua 
Published: June 2020

Abstract
Hand pallet truck is widely used to carry baggage and cargoes in daily life and work. However, rotary-lift based luggage hand pallet truck is inconvenient to handle and difficult to carry heavy goods. Hydraulic cylinder based hand pallet truck is also used commonly, but its lifting speed is not fast enough. In addition, most of them can’t save energy. To this end, a novel rotary-lift based hand pallet truck is proposed. Auxiliary and cushioning forces are provided by gas springs. Its lifting height is adjustable. Critically, its lifting mechanism can be locked automatically after ascending or descending into the target positions. Thus, it’s easy for just one person to operate. Aiming at saving time, force and energy, a multi-objective optimization design model for the lifting mechanism is built, based on which most key parameters and dynamics indexes can be calculated. Numerical analysis and experiment results show that the proposed model is effective and the design scheme of the novel hand pallet truck is feasible.
Development Research and Crucial Technology Analysis of Scaled 3-Bearing Swivel Duct Nozzle Rotary Drive System
Authors: Qi Hao , Yang Xiao , Wang Zehe , Zhu Huajuan 
Published: June 2020

Abstract
The 3-bearing swivel duct (3BSD) nozzle for short-range/vertical take-off and landing(S/VTOL) fighters is a crucial component for aircraft to achieve vertical and/or short take-off and landing, which significantly improves the manoeuvre ability of the aircraft, while the nozzle rotary drive system is the crucial technology for S/VTOL functions which has significant impact on the fighter performance. Based on the principle and characteristics of the 3BSD nozzle, this paper systematically reviews the development and evolution of the 3-bearing swivel duct nozzle, and analyses and summarizes the types and characteristics of the 3BSD nozzle rotary drive system. Three crucial technologies of the 3BSD nozzle rotary drive system are evaluated and discussed in detail. Suggestions on future research and development of equipment are given.
Kinematics analysis and optimization of 6R manipulator
Authors: Li Qidong , Ju Hehua , Xiao Pengfei 
Published: June 2020

Abstract
In order to solve the problem of 6R manipulator kinematics, this paper analyzes the inverse kinematics solution and optimizes the solution process of forward kinematics. Aimed to the structural characteristics of the manipulator, this paper first introduces the concept of the natural invariants, establishes the Denavit-Hatenber (D-H) model based on the natural invariants and proposes a new iterative algorithm for manipulator forward kinematics. Then, the inverse kinematics based on the natural invariants is proposed, which is divided into the position inverse solution and the inverse attitude solution, and the analytical solution is obtained by analyzing the singularity of the solution. Finally, the visual simulation model is built with MFC and Coin4D. The simulation results show that the proposed forward and inverse kinematics method of the six-degree-of-freedom manipulator has small error and high efficiency, and the accuracy and real-time performance of the algorithm are verified.
Numerical Study on the Effectiveness of Vectoring Primary Flow with Dilator by Using Microjet Actuator
Authors: Gao Feng , Zhang Qian , Chen Fengli , Zhang Chengtao 
Published: June 2020

Abstract
In the present paper, orient control of dilator primary flow in microjet were simulated numerically by using microjet actuator with the X-L whole flow field calculation model. The effects of different expansion half angles of the primary flow channel, microjet actuator amplitude, micro jet actuator frequency, and the position of micro jet actuator and primary flow velocity on deflection of primary flow were analyzed. It is found that expansion half angle has great effect on the effectiveness of vectoring primary flow with dilator using microjet actuator; if the expansion half angle is small, the wall-attached flow of micro jet plays a main role in driving the primary flow flows along dilator wall; if the expansion half angle is big enough, the coupling effect between microjet and shear layer plays the main role. With the increase of the velocity of the actuator, the controlling efficiency of microjet is expanded. Besides, dilator decreases the distance sensibility between actuator and primary flow. With the increase of primary flow velocity, the controlling efficiency of microjet is decreased.
Star Sensor Layout Design Based on PSO
Authors: Zha Micheng , Zhao Liping 
Published: June 2020

Abstract
Incident light, such as sunlight and atmosphere-earth light, will interfere with the viewing field of star sensor, and the accuracy and precision of star sensor will decrease. A design method based on PSO algorithm and STK software to solve layout problems efficiently is applied. The star sensor layout problem is described as the problem of finding the global optimal solution in three-dimensional space. The results show that this method can solve the problem of satellite sensor layout quickly and effectively and the method has certain engineering application value.
Effect of tungsten on creep properties of martensitic 9Cr steel
Authors: Hu F Y , Zhang S J , Shen J J 
Published: June 2020

Abstract
The effects of tungsten on the creep behavior and microstructure of tempered martensite 9Cr steel with different W concentrations ranging from 0–2.5 wt% were studied. The matrix consisted of tempered lath martensite structure and M23C6 located along the grain boundary or inside the grain. As the W concentration increased, the number of M23C6 increased while the particle size decreased. Also, with the increasing W concentration, the minimum creep rate and elongation decreased while the time to rupture increased. The rise in W concentration led to the refinement of M23C6, which enhanced the creep strength but reduced the creep plasticity.
Numerical study on porosity distribution in casting under micro- amplitude vibration condition
Authors: You K , Rao L , Bai X , Miao T Y 
Published: June 2020

Abstract
Combining with Pequet’s porosity model, this paper coupled vibration effect into the heat transfer models based on the turbulent heat transfer theory, on this basis porosity distribution of alloys under micro-amplitude vibration conditions can be analyzed. The simulated porosity results of ZL201 alloy show that appropriate vibration frequency (10Hz˜30Hz) promoted the mass feeding and capillary feeding by increasing the Dendrite Arm Spacing (SDAS) and heat transfer specific surface area of mass liquid channel, thus efficiently decreasing porosity distribution in casting. However, too high vibration intensity (40Hz˜50Hz) may deteriorate porosity distribution in casting due to insufficient feeding capacity. The vibration model provides a theoretical basis for the study on effect of mechanical vibration on casting, which is significant for the optimization of vibration parameters and porosity prevention in casting technology.
Finite element model and experimental verification of Glare laminate impact
Authors: Cui X , Zhang Z Y , Wang S 
Published: June 2020

Abstract
In this paper, a finite element simulation model is established for the impact of Glare laminates, and the reliability of the model is verified by experiments. Glare applies the continuum damage mechanics (CDM) model and inputs the user material subroutine VUMAT to determine the damage of the material based on the theory of CDM under plane stress state. By comparing the ultrasonic scanning experiment after impact damage with the CDM finite element simulation cloud pattern used in this paper, the constitutive relation of the fibre continuous damage model used in this paper can better simulate the damage initiation, evolution and damage of internal materials.
Numerical study on effect of micro-amplitude vibration on the grains morphology of alloys
Authors: Rao Lei , You Kai , Bai Xue , Miao Tianyu 
Published: June 2020

Abstract
Combining with CAFE model, this paper introduced a modified heat transfer model which interfere the effect of mechanical vibration based on turbulent heat transfer theory, on this basis the grains morphology of alloys under micro-amplitude vibration can be analyzed. Based on this model, the results of ZL201 alloys showed that vibration can promote columnar-to-equiaxed transition (CET) and grain refinement, and improve homogeneity of grains distribution. The optimum vibration frequency in current study is 40Hz. The method used in this paper provides a reference for study on the theory of vibration casting and is beneficial for parameters optimization of mechanical vibration in foundry field.
Fire resistance characteristics of steel-concrete-steel structure and reinforced concrete structure in an eight-lane dual-directional super large-span immersed tunnel
Authors: Zhengmao Cao , Liu Xiao 
Published: June 2020

Abstract
In order to obtain the fire resistance of Steel-Concrete-Steel structure(SCS) and reinforced concrete structure(RC) in super-large span cross section immersed tunnel, fire numerical simulation calculation was conducted to analyze the temperature field of SCS and RC in an Eight-lane Dual-Directional immersed tunnel fire by the finite element method. Three-dimensional finite element models of steel and concrete composite structure under different tunnel fire scenarios in terms of reasonable thermal parameters, material model, and correct boundary conditions was established. On this basis, analysis for the mechanical properties of the composite steel-concrete structure under the ISO-834 standard fire was conducted. The results of the study indicate that temperature of RC slab near the fire surface is grew faster than SCS slab in the immersed tunnel fire, and the temperature inside the SCS slab is lower than that of RC slab in the immersed tunnel fire. The temperature at the nearest monitoring point by the fire surface of the SCS slab is 31.3% lower than that at the same position in the RC slab, which is 41% lower in the center of SCS slab. Research result provide a reference to the theoretical studies and practical engineering of SCS extra larger span immersed tunnel fire, and provide support for the fire protection design of SCS structures in practical engineering.
Stability Test of Nanostructured Lipid Carriers-Loaded Mefenamic Acid prepared by Microemulsion Technique
Authors: Suksaeree Jirapornchai , Treelop Apinya , Veeravatanayothin Pitsacha , Maneewattanapinyo Pattwat , Monton Chaowalit 
Published: June 2020

Abstract
The objectives of this study were to prepare the nanostructured lipid carriers (NLCs)-loaded mefenamic acid and to study the particle size and zeta potential of the NLCs-loaded mefenamic acid after storage in refrigerator (approximately 2 – 4°C) for 7 days. The preparation method of NLCs-loaded mefenamic acid used the microemulsion technique. All compositions were vigorously mixed with vertex method to obtained the clear microemulsion solution. Tween®80 (surfactant) and 1 – butanol (co – surfactant) were mixed at the ratio of 3:2 to use as the surfactant mixture. Then, it was dispersed in cold water (approximately 2 – 4°C) at different ratio, and the droplet size was reduced by a homogenizer at 6, 000 rpm for 5 minutes and sonicator for 30 minutes to form the NLCs-loaded mefenamic acid. The prepared NLCs-loaded mefenamic acid were kept in refrigerator (approximately 2 – 4°C) for 7 days. After that, the solutions were tested the particle size and zeta potential. The particle size and zeta potential of NLCs-loaded mefenamic acid after storage were in the range of 160-310 nm and -4.00 to -19.00 mV, respectively. It was found that the F4 formula was the best to prepare the NLCs-loaded mefenamic acid. F4 formula composed of the 1%w/w mefenamic acid, 10%w/w water, 80%w/w surfactant, and 10%w/w capric triglyceride, and the dilution ratio was 1:25.
Decomposition of the Vector Field of Preferred Directions for Optimization of Five-Axis Machining
Authors: Makhanov S. S. 
Published: June 2020

Abstract
A new algorithm to increase the production rate of a five-axis milling machine through improving the coordinates of the to-be-milled points transformed from the workpiece to the machine coordinates is presented and analysed. The method optimizes the cutting path by following a vector field (VF) of optimal directions maximizing the material removal rate (MRR). The algorithm includes grid generation, space filling curves (SFC) and a VF decomposition using rotation invariant complex moments. The case of a radial tool path requires a special treatment called Compact Radial Zigzag (CRZ). To reduce the redundancy, the CRZ is composed of layers with a varying step between the tracks. The combination of the proposed techniques generates tool paths which produce complex shaped Stereolithography (STL) surfaces faster than the conventional methods.
Effects of Surface in the IR and Raman Spectrum of Porous Silicon Carbide
Authors: Bermeo R , Arellano L. , Trejo A , Salazar F , Calvino M. , Miranda A , Cruz-Irisson M 
Published: June 2020

Abstract
Porous Silicon carbide has been identified as an attractive material for its use as electrode in supercapacitors, however the theoretical investigations about its properties, specially its vibrational properties, are still scarce. In this work the effect of the Si-C surface ratio on the vibrational properties, IR and Raman spectrum of porous silicon carbide was studied using the first principles density functional perturbation theory. The porous structures were modelled by removing atoms in the [001] direction from an otherwise perfect SiC crystal using the supercell scheme. The morphology of the pores was chosen so there would be more Si or C in the pore surface. The results show that the vibrational properties, and thus the IR and Raman spectrum of the porous SiC change depending if the pore surface is either Si or C rich, having the Si-rich pores more low frequency modes due to its higher mass. Also, the effects of phonon confinement are lessened by the effect of surface passivation, thus indicating that the surface plays an important role in the IR and Raman characterization of these structures.