bluuebunny/crossref_metadata_2025 huggingface dataset:
Preparation, Characterization and Visible Light Photocatalytic Activities of Samarium-Doped Mixed Crystalline Phase TiO2 Nanoparticles
Authors: Peng Fuchang , Lai Qi , Chang Wei , Cui Yan
Published: August 2019

Mixed crystalline phase TiO2 nanoparticles with different content of Sm ion were prepared by a facile sol-gel method. The samples were characterized by XRD, XPS, UV-Vis-DRS, and PL. The influence of Sm-doping on structure and visible light photocatalytic activity of mixed phase TiO2 was evaluated by photocatalytic degradation of MB under the irradiation of fluorescent lamp. The results indicate that samarium appears two kinds of Sm3+ and Sm2+ valence state on the surface of TiO2. Sm doping can restrain the phase transition from anatase to rutile, and prevent the grain growth. Appropriate amount of Sm doping and the proportions of rutile and anatase mixed phase can effectively inhibit the recombination of photo-generated electron and hole pairs, expand the wavelength range of absorption spectrum. Moreover, the photocatalytic activity of Sm-TiO2 in MB degradation is evidently enhanced. The MB degradation rate of Sm-TiO2 samples with n(Sm): n(Ti)=0.006 is the best under the irradiation of fluorescent light when the sintered temperature T=500°C, it is 97% within 6 h, which is significantly higher than 56.4% of pure TiO2 under the same experimental conditions.
Investigation on Coupling Physical Mechanism between Acoustic and Structural Vibration of Elastic Cavities at Supersonic Speed
Authors: Yang Ye , Yang Dangguo , Wang Xiangshen , Zhou Fangqi
Published: August 2019

The coupling of cavity noise and the structural vibration caused by the flow around the cavity at high speed will adversely affect the structure of the aircraft and threaten flight safety. Through the synchronous test method of noise and structural response, the test of acoustic/vibration coupling characteristics of the elastic cavity at supersonic condition in a wind tunnel was carried out, and the elastic cavity noise, structural vibration response characteristics and the coupling law were studied. The results show that the intracavity noise load mainly affects the low-order modal response of the cavity structure. Compared with the rigid cavity, the maximum position of the intracavity noise affected by the radiated sound wave is near the elastic boundary with strong vibration characteristics, and the noise peak frequency component is particularly affected.
Research on Anchorage Performance of New CFRP Plate Anchorage Based on Displacement Control
Authors: Long Peiheng , Shi Wenhao , Hou Suwei , Jiao Chiyu , Xu Haomai
Published: August 2019

The anchorage characteristics of CFRP plate anchors are controlled by anchorage deformation. The anchoring efficiency of anchors under tension and the force mechanism of CFRP plates are studied. The preliminary design of splint anchors is carried out by ANSYS general software. The deformation and stress of the CFRP plate under the displacement control of the different splint edges are analyzed, and the corresponding splint displacement is 0.55mm when the anchoring efficiency is 100%. At the same time, the finite element analysis results were compared by the anchor static test, and the stress loss and relative slip of the CFRP plate were analyzed. The research shows that: from the test results, when the total displacement of the splint reaches 0.55mm, the CFRP plate undergoes longitudinal splitting failure; when the total displacement of the splint reaches 0.50mm, the test anchoring performance is the best, the anchoring efficiency is 82%; the total displacement of the splint is 0.30∼0.55. When mm is used, the slip amount of CFRP plate is 0.69∼3.31mm. The better the anchoring performance is, the smaller the slip amount is. The loss of stress caused by CFRP plate retraction and anchorage deformation is recommended to be 7.5% of the total tensile stress.
Effect of Relaxation Heat Setting at Various Temperatures on Molecular Orientation in Polypropylene Fiber
Authors: Ai Wei , Liu Xin , You Song , Liu Fangyi , Yu Ze , Tao Lei , Liu Hongtao
Published: August 2019

Commercially available polypropylene fiber (PPF) samples with relaxation heat setting for 30 minutes in a drying oven at various temperatures (room temperature, 90 °C, 100 °C, 110 °C, 120 °C, 130 °C, 140 °C, 150 °C, respectively.) were prepared for measurement of their sonic velocity, orientation degree, orientation angle and modulus. According to the obtained data for the PPF molecular orientation before and after the relaxation heat setting, it is found that, with the increasing of relaxation heat setting temperature, the sonic velocity in PPF, orientation degree and modulus decreased, while the orientation angle increased. The result may be helpful to choose proper working temperature for PP hernia patch fabrication.
Computational Analysis on Material Movement of LS Screw Conveyor
Authors: Zeng Peng , Fang Ziqiang
Published: August 2019

In industrial production, LS screw conveyors are widely used due to their high transmission efficiency and simple operation. In this paper, the material movement influence such as the helix angle, the friction angle, and the resultant force of LS conveyor is studied, and the improved design of the blade is carried out to make its perform better in production.
Synthesis and Characterization of Fluorescent Mesoporous Silica(Znq-CMS)with a Zinc Complex of 8-Hydroxyquinoline
Authors: Liu Jian , wang Youyun , Guo Shen’e , Liu Mingxing
Published: August 2019

This experiment is to prepare fluorescent mesoporous silica and explore its characteristics of the zinc complex of 8-hydroxyquinoline, synthesize CMS-SH by base-catalyzed sol-gel method, and then complex the zinc complex of 8-hydroxyquinoline. Go in and successfully synthesize Znq-CMS. In addition, the particle size and potential of CMS-SH and Znq-CMS were characterized by dynamic scattering (DLS), and the fluorescence characteristics of Znq-CMS were characterized by a fluorescence spectrophotometer and an ultraviolet lamp. The results show that Znq-CMS has good dispersibility and fluorescence effect. The purpose of this study is to explore a new model of drug delivery system for stimulus response.
Abrasion Resistance of Manufactured Sand (MS) Concrete and Its Influence Factors
Authors: Luo Guang , Xie Jicheng , Chen Zheng , Zhang Yun
Published: August 2019

The feasibility of using MS to replace river sand (RS) in concrete pavement has been widely concerned by scholars, however the abrasion resistance of MS concrete pavement serves as a major factor restricting application. Published literature shows huge potential of MS as a replacement of natural fine aggregate. A detailed overview of published literature on property of MS and influencing factors on abrasion resistance of MS concrete is being presented. Regarding the characteristics of MS, the granular shape is characterized by irregular shape, multi-angle and large aspect ratio, the gradation shows a phenomenon of less in the middle and more on both ends, and MS contains high content of stone powder and little mud powder. The influencing factors include mix ratio, lithology, stone powder, admixture, polymer, etc. Among them, stone powder has attracted the attention of many scholars. Nevertheless, few related studies exist at present, source selection and in-depth research merit consideration.
Plasmon Excitations in Spin-Polarized Iron Atomic Chains: A Time-Dependent Density Functional Theory Study
Authors: Lin Jiazhou , Ke Sanhuang
Published: August 2019

By using the time-dependent density functional theory calculations, we study the plasmon excitations in Fe atomic chains with different numbers of atom and different Fe-Fe separations, which are now possible to fabricate experimentally. Because of the Fe valence 3d orbitals and the spin polarization, the excitations along the chain (longitudinal (L) mode) and perpendicular to the chain (transverse (T) modes) are found to be largely different from those in noble metal and alkali metal atomic chains. First, the strength of dipole response becomes weaker due to the more localized Fe 3d states; Second, the L mode is mixed with some multipole contribution; Third, the end mode of the T modes is absent.
Preparation and Characterization of α-Fe2O3 from Iron Mud by Hydrothermal Synthesis
Authors: Luo Shaojun , Li Suqin , Zhang Peng
Published: August 2019

As a solid waste, the synthesis of α-Fe2O3 from iron sludge remains a challenge. In this experiment, α-Fe2O3 nanocrystals were successfully synthesized by hydrothermal method using iron sludge as iron source, and the effects of reaction time and pH on the experimental results were studied. The synthesized products were characterized by X-ray diffraction, SEM, FT-IR and VSM analysis. The results show that the optimum synthesis time and pH are 6 h and 6 respectively. Under these conditions, the size of nanocrystalline α-Fe2O3 is about 80 nm. According to the hysteresis loop, the powder synthesized is a weak magnetic material, which has broad application prospects in high frequency electromagnetic materials.
Analysis of Numerical Simulation on Combustion of Different Fuels in Float Glass Furnace
Authors: Jin Mingfang , He Feng , Xie Junlin , Mei Shuxia , Zhong Liyang , Zhao Yuhua
Published: August 2019

The feasibility and reliability of numerical simulation model and calculation method are verified by comparing the simulation results with the relevant data collected during the operation of the furnace in the actual plant. Under the condition of constant thermal power of the furnace, the combustion status, temperature distribution and nitrogen oxides formation in combustion space of the furnace are simulated and studied when the fuel is heavy oil and petroleum coke respectively. The study found that large-scale transverse circumfluence is formed in the refining zone in the back of the furnace and the temperature system is stable and consistent whether the fuel is heavy oil or petroleum coke. When the fuel is petroleum coke, the combustion in the furnace is more intense and the temperature of the batch is higher, but the crown is eroded more strongly by high temperature flow. When the fuel is heavy oil, the scope of the high temperature zone whose temperature is higher than 2073K is wider, and the temperature of the glass level and the crown in the furnace is slightly higher, but the production of nitrogen oxides with burning heavy oil is much more than that of burning petroleum coke.
Modeling the Electrical Conductivity of Anode for Solid Oxide Fuel Cell using Support Vector Regression Machine
Authors: Tang Jiangling , Huang Ping
Published: August 2019

The electrical conductivity of Solid Oxide Fuel Cell (SOFC) anode is one of the most important indexes effect the efficiency of SOFC. In order to improve performance of fuel cell systems, it is necessary to have model which modeling the electrical conductivity. In this paper, a model using Support Vector Regression Machine (SVRM) was established to modeling the electrical conductivity of La0.75Sr0.25Cr0.5Mn0.5O3-δ-xCuO (LSCM-xCu) composite anode under two influence factors, including operating temperature (T) and Cu content (x) in LSCM-xCu composites anode. The test result by SVRM support that the generalization ability of SVRM model is with high accuracy. The mean absolute error (MAE) of 4 test samples is 0.32, mean absolute percentage error (MAPE) is 1.05%, multiple correlation coefficients (R2) is 1.00, which is quite satisfied with the engineering demand. This investigation suggests that SVRM is a powerful tool to be used for optimal designing or controlling the technological process of fuel cell system.
Comprehensive Treatment Technology of “Two Low and One Close” Well
Authors: Li Kai
Published: August 2019

In this paper, the criterion of “two low and one shut - in” well is formulated, and its formation reason and treatment potential are analyzed and classified. Combined with reservoir multidisciplinary research results and dynamic monitoring data, conventional technology integration treatment and new technology research are carried out for different types of “two low and one shut - in” wells, and a new comprehensive treatment technology is summarized and applied to the “two low and one shut - in” well treatment in Sabei Development Zone, and good results have been achieved.
International Comparison of Professional Degree Education Certification in Environmental Engineering
Authors: Zhang Yuhua , Huang Yidong
Published: August 2019

This paper takes environmental engineering education professional certification as the research object. (1) Through extensive literature research, the environmental engineering education professional certifications such as ABET, ECUK and ASIIN are taken as examples to the certification institutions involved in engineering education certification in developed countries. The content of the certification standard, the certification procedure, the relationship between the certification and the qualification of the engineer were systematically sorted and analyzed in detail. Through comparative analysis, the similarities and differences between the three certification bodies are obtained. (2) The comparative analysis method was used to classify the characteristics of engineering education certification in developed countries as “six combinations”.
Study on Population Development and Carrying Capacity of Water Resources and Land Resources in China——Taking the Next 10 Years as an Example
Authors: Peng Shuolong , Wang Jie , Ye Guangyu
Published: August 2019

The article takes the next 10 years as the research period to explore the challenges that water resources and land resources will face in the context of the universal two-child policy in China. By adjusting the population parameters in the policy context and using CPPS population forecasting software to predict the population size in the next 10 years, we find that the total population of China will continue growing in the next 5 years. In the next 10 years, the urban population will decrease very slightly after the increase for 7 years, reaching a peak in 2027, and the increase will cause deepening urbanization. It is necessary to take countermeasures to cope with the problem of the carrying capacity of water resources and land resources brought about by the growth of the total population and the deepening of urbanization under the influence of the universal two-child policy effect, so as to achieve the harmonious development of population growth and urbanization with ecological environment.
Preparation of Sodium Pyrophosphate Modified Municipal Sludge Biochar for the Cu Adsorption in Aqueous Solution
Authors: Fan Liangqian , Liu Qin , Wang Xianda , Cai Jie , Miao Jiaxin , Wan Yan
Published: August 2019

In this work, sodium pyrophosphate (SP) was used as a modifier to prepare the sodium pyrophosphate modified municipal sludge biochar (SP-MSB) for effectively adsorbing Cu in aqueous solution. Four modification factors, i.e., SP concentration factor, impregnation time factor, impregnation solid-liquid ratio factor, and impregnation temperature factor, were investigated to explore the suitable modification condition for the preparation of SP-MSB. In addition, the Cu adsorption efficiencies of the SP-MSB under the suitable modification condition and the unmodified municipal sludge biochar (MSB) were preliminarily evaluated. The results showed that the suitable modification condition for the preparation of SP-MSB was SP concentration of 60 g/L, impregnation time of 10 h, impregnation solid-liquid ratio of 1:30, and impregnation temperature of 25 °C. The Cu adsorption capability of the SP-MSB was 6.37 times than that of MSB, indicating that the SP-MSB can be used as an alternative adsorbent to adsorb Cu in aqueous solution.
Research on Deformation Characteristics of New Breakwater Structure
Authors: Li Bin , Tong Xinyao
Published: August 2019

With the increasingly stringent of environmental protection requirements of the China, there is fewer and fewer land reclamation projects, so the related research on dredged soil treatment technology has become a hot spot. A new type of mud-sand interbedded structure is put forward in this paper. The dredged soil is filled in membrane bag and interbedded with sandy membrane bag, which gradually forms a stable new seawall core structure. From the finite element simulation results, it is known that the maximum displacement of mud-sand interbedded structure is 2.73 m. After the calculation, the top surface of the mud-sand interbedded structure is 1.9 m from the back surface, and the compression of the mud-sand interbedded structure is mainly occurs in the middle of the body, the bottom and top are less compressed. The design and construction of the breakwater meets the engineering requirements, and it is a feasible and fast breakwater technology on soft soil foundation.
Isolation of Protoplast from Leaves of Castor (Ricinus communis L.)
Authors: Tang Jianian , Liu Bingzhen , Chen Miao , Xue Yingbin , Liu Ying , Wu Zhengwei
Published: August 2019

In the present study, the young leaves of castor were used as materials to obtain protoplast, and the effects of enzymatic hydrolysis system on the yield and quality of protoplast were analyzed detailedly. The results shown that the treatment of the young leaves of castor with 1.5% Cellulase RS and 0.75% Macerozyme R-10 for 80 min could gain the maximum amount of protoplast. In addition, the activity of protoplast was observed with 1% Evans blue staining, and most of the protoplast (76.03%) from castor leaves had physical vitality. It lays a foundation for further studies on plant breeding and functional genes in castor.
Effect of Viscous Flow Activation Energy on the Gas-Assisted Extrusion Forming of Plastic Micro-Tube
Authors: Ren Zhong , Huang Xingyuan
Published: August 2019

In this paper, the effect of viscous flow activation energy on the gas-assisted extrusion (GAE) forming of the plastic micro-tube was investigated by numerical method. The three-phase fluids geometric model was built and same boundary conditions were imposed in the model. Under different viscous flow activation energies (VFAE), the influence of VFAE on the size changes of plastic micro-tube in the GAE were obtained. Moreover, the flow velocities, pressure, temperature, and viscosity distributions of melt were also gotten and analyzed. Results show that with the increase of viscous flow activation energy, the inner and outer radiuses all synchronously increase due to the increase of radial velocity and axial velocity. In addition, the temperature distribution slightly increases, which results in the decrease of the pressure and viscosity of melt.
In Situ Observation of Austenite Grain Growth and Phase Transformation of A517GrQ Rack Steel for Jack-Up Offshore Platform
Authors: Wang Qinghai , Ye Qibin , Wang Wenbo , Deng Xiangtao , Wang Zhaodong
Published: August 2019

Austenite grain size plays an important role for quenched and tempered A517 GrQ rack steel. In order to investigate the austenite grain growth behavior, in-situ austenizing experiments were conducted at different temperatures with varied holding time. Austenite grain growth, and subsequent bainite and martensite transformation were observed by a confocal laser scanning microscope (CLSM). The average austenite grain size increased rapidly from 32.7 μm to 137.9 μm with increasing temperature from 1100 °C to 1250 °C, and abnormal grain growth occurred at 1250 °C for 15 min. While holding from 5 min to 20 min at 1200 °C, the grain size grew gradually from 70.2 μm to 84.8 μm. The grain size distributions under different conditions all obey lognormal function. After austenizing, the rate of subsequent cooling has an significant impact on transformation process. The transformation duration time decreased from over 142 s to 11 s with increasing cooling rate at 1 °C/s and 5 °C/s, which could be corresponding to bainite and martensite transformation respectively.
Mechanical Behavior of Hinge Lozenge Grid Structure
Authors: Li Zhong , Wang Shuai , Zhou Kaifa , Tan Qianwen , Feng Huolei
Published: August 2019

There are two phenomena in the inflation process of the existing stent, dogboning and axial expansion, which will shorten the life of the stent and lead to the failure of stenting. Firstly, The hinge lozenge grid structure with negative Possion’s ratio was reported. Secondly, the process of inflation and springback of stent were simulated based on finite element method in order to analyse its expansion, axial expansion ratio and resilience rate. It is demonstrated that hinge lozenge grid structure with symmetrical deformation exhibits “full-scale expansion” structural properties. Besides, the diameter of inflated stent is twice as much as initial after expansion. Also, it shows axial elongation as well as increasing axial expansion ratio. The displacement changes obviously with the increase of pressure with other conditions unchanged. This new structure not only improves the radial support performance of intravascular stents significantly, but also overcomes the shortage of traditional stents, which provides a new idea for the design and optimization of intravascular stents.
The Orthogonal Experiments for Radial Jet Cyclone
Authors: Mo Yuchen , Liu Genfan , Liu Xianjie , Zhou Jielian
Published: August 2019

Radial jet cyclone (RJC) is a new type of dust removal equipment based on the improvement of traditional cyclone which greatly improves the separation efficiency of small size particles and inevitably increases the pressure drop. In order to explore the comprehensive influence of the structure size and process parameters of the radial jet cyclone on its separation efficiency, this paper selected five main influencing factors: blade helix angle, blade length, vortex finder depth, airflow velocity and particle concentration to design a set of orthogonal experiments. Through analysis, the experimental results show that the flow velocity has the greatest influence on the pressure drop, followed by the blade helix angle, and the other three factors have a smaller influence. The insertion depth of the riser has the greatest influence on the separation efficiency. While the smaller the vortex finder depth is, the higher the separation efficiency. The other influencing factors are blade helix angle, airflow velocity, blade length and dust concentration.
Study on the Transient Creep Stage by Small Beam Specimen with Fixed Constraints
Authors: Wang Junqi , Zhou Guoyan , Tu Shantung
Published: August 2019

Three-point bending specimen with fixed constraint (TPBSF) has potential advantages in engineering application because of its simple stress state and easily achievement of rupture data. It is critical to accurately evaluate the creep curve of TPBSF for the application in engineering. In this study, TPBSF behavior of aluminium alloy A7N01 at 653K has been investigated at various loads in the range 12-20N. The creep curve clearly exhibited transient, steady-state and tertiary stages. The creep displacement data has been analysed according to the Garofalo’s equation. The rate of exhaustion of transient creep exhibited similarly dependence on load as steady-state displacement rate. It indicates that the transient and steady-state creep displacement of TPBSF obey the same kinetics law. The time to attain the steady-state stage and the rupture time are approximately inversely proportional to the rate of exhaustion of transient creep. The transient stage of TPBSF creep accounts for about 34% of the overall creep time. It is useful for predicting TPBSF creep deformation and residual life of the material.
Coupled Responses in a Partially Liquid-Filled Container with the Multi-Elastic Baffles Subjected to Pitching Excitation
Authors: Wang Jiadong , Cao Zhanxue
Published: August 2019

The coupled responses in the partially liquid filled container with multi-elastic annular baffles are investigated by the semi-analytical method subjected to the pitching excitations. The trial solutions of the dynamic deflections of the multi-elastic baffles, the surface wave height and the velocity potential can be obtained by introducing the time-dependent generalized coordinates. The Stokes-Joukowski potentials, which are relevant to the kinematical boundary condition of the container, can be obtained analytically. Based on the coupled vibration equations of the multi-elastic baffles and the boundary conditions on the free surface, the coupled dynamic response equations can be established. Parameter studies are carried out to investigate the effects of the parameters of the multi-elastic baffles on the coupled responses of the system.
Study and Application of Self-Adaptive Fuzzy PID Control in Dissolved Oxygen Control of Wastewater Treatment
Authors: Zhang Dasen , Chu Jian , He Yacong , Jin Hui , Han Wei
Published: August 2019

In view of the typical nonlinear, time-varying and large lag characteristics of dissolved oxygen (DO) concentration control in wastewater treatment, it is difficult to obtain a good control performance by using conventional proportional-integral-derivative (PID) control. In order to greatly improve the control effect, designing a self-adaptive fuzzy PID controller. Through analysis and reasoning can obtain the optimal control effect under the optimal membership. MATLAB simulation and application show that compared with the conventional PID control, the self-adaptive PID controller accelerates the response speed of the dissolved oxygen control system and reduces the overshoot. This control method achieves a better control performance in the actual sewage treatment central control system, improves the sewage treatment efficiency, and has the value of popularization and application.
Experimental Study of Recrystallization for C-Mn extruded Workpiece
Authors: Yang Baojian , Jiang Li , Li Huijun , Zhong Yonghua , Tang Jianhua
Published: August 2019

Recrystallization is a key step while conducting the composite process of severe extruding and heating treatment for fabricating the ultrafine-grained parts, howerer, the heating temperature palys a vital role that it directly effects the metallographic structure of extruded workpiece. In order to reveal the effects of heating temperature on metallographic structure of the extruded workpieces,three kinds of samples with different reduction ratio were put into the heating furnace when the temperature in frunace is over the recovery temperature of C-Mn extruded workpiece(about 450 °C), that is to shorten the temperature-rising time,thus the nucleation rate was increased simultaneously by doing so. During the heating process, the time-constant & temperature-varying together with time-varying & temperature-constant experimental scheme were adopted for different samples. Finally by measuring the hardness and analyzing the micro structures of C-Mn extruded workpiece, it can be concluded that fully recrystallization occurs in No.3 extruded workpiece with the condition of heating for 1 hour at 580 °C and cooled in the furnace, its average size is about 1 um.
Simulation Research on Variable Frequency Control System of Hoist in Inland River Locks Based on Fuzzy PID
Authors: An Xiaogang , Zhu Weiwei , An Na
Published: August 2019

In view of the demand in the operation process of lock gate as “slow start-fast run-slow stop”, our study introduced the variable frequency control technology and established the opening and closing machine control system model. We conducted the closed-loop control simulation based on fuzzy PID to effectively suppress or eliminate the influence of error. Thus, the optimal control algorithm and strategy are obtained, and the precise control of the opening and closing process of the miter gate is realized.
The Application of Intelligent Simulated Human Teaching Equipment in Clinical Practice
Authors: Wang Na , Han Wei , Wang Rui , Wang Jinguo
Published: August 2019

The application of modern science and technology to the basic experimental teaching of medical students is an important trend in the reform of experimental teaching in medical colleges and universities. The international advanced intelligent simulated human ECS teaching equipment and integrated functional experimental teaching are organically combined to operate and apply in the virtual clinical cases, and the theoretical knowledge and clinical skills are tested. This has achieved remarkable results in the cultivation of modern medical education talents, and has achieved the goal of cultivating students’ clinical thinking and analytical ability, and improving the comprehensive quality of medical students, thus providing new ideas for the reform of modern functional experiment teaching.
A Novel Gear Honing Machine Parameter Design and Finite Element Analysis Based on the Principle of Dislocation Axis Line Contact
Authors: Yu Lijuan , Guo Xinxu , Zhang Xuecheng , Wang Xin , Ji Xiaoming , Wang Hongguo
Published: August 2019

The characteristics of the dislocation axis line contact gear space transmission was analyzed in order to study the new precision gear honing machine prototype which could be clamped and formed at one time, and a pair of dislocation axis involute helical gears in space was designed from the most basic principle of involute gear meshing. The vertical dislocation axis line contact the worm and worm gear (helical gear) transmission mechanism were formed, when two gears had equalent normal base diameter and the sum of their base-circle spiral angles was equal to 90°. According to worm drive relationship of the vertical dislocation axis line contact, the helical gear tooth surface was honed through the worm could be used as a grinding wheel of the honing machine. Grinding wheels with different parameters could be used to machine bevel gears with different modulus, different numbers of teeth and different tooth widths. The finite element analysis and optimization showed that the prototype of the machine tool was reasonable, and the first-order natural frequency is 341.8Hz, which was much higher than the working frequency of 30Hz to avoid resonance.
Laboratory Test and Numerical Simulation for Geotextile Bag with Sand Cofferdam of Immersed Tunnel
Authors: He Zegan , Wei Lixin , Yang Chunshan , Chen Junsheng
Published: August 2019

The mechanical indexes of the geotextile and filling sand were obtained by laboratory test based on geotextile bag with sand cofferdam of Zhoutouzui immersed tunnel in Guangzhou, and a fine calculation model was established. The deformation development law of geotextile bag with sand cofferdam was explored by refined numerical calculation. Combining with the existing research results, the deformation mechanism was determined. Numerical results were verified by theoretical analysis and the control index of design and construction was proposed. The results show that cofferdam moves to the side of dry dock under the action of unbalanced pressure, and the displacement decreases from the top to the bottom. Cofferdam appears settlement under gravity and pumping action as well as the displacement increases with the pumping water level decline. The main reason of cofferdam’s large deformation is density increase caused by dewatering, which increases overlying pressure from upper geotextile bag to lower one and makes geotextile flattening deformation. Foundation soil experiences vertical pressure consolidation, lateral extrusion and local sliding, which causes the maximum and minimum deformation present to the top and toe of geotextile bag. The cofferdam has no sliding failure and is in overall stability as well as the numerical results are consistent with results deduced by theoretical analysis, so the cofferdam should take the height as the control index.
Vacuum Switch Contact Position Detection Based on Labview
Authors: Ma Liting , Wang Zhengqi , Su Chong
Published: August 2019

Arc shape of vacuum switch is one of the main influencing factors of the breaking performance of vacuum switch. The contact opening distance directly affects the development of arc shape. How to accurately detect the real-time position of the contact and calculate the contact distance is of great significance. Therefore, based on Labview virtual instrument technology, a software and hardware system for real-time position detection of contacts for vacuum interrupter is designed. The system collects the arc image during the vacuum switch opening process by high-speed camera, and then uses the virtual instrument development platform Labview as the programming software to process the arc image and analyze the edge features. Finally, the edge information detected is used for fitting, to realize pinpoint of the moving and static contacts. The experimental results show that the detection system can accurately detect the real-time position of the contact. It has the characteristics of high detection efficiency, stable operation and easy operation. The detection results provide technical support for analyzing the vacuum switch arc shape.
Application of New Dressing to Post-operation Skin Flap Necrosis in Breast Cancer Patients Damlms Scot and Vibas Cross
Authors: Qu Liying , Zhou Jianping , Sun Guang
Published: August 2019

Purpose: to discuss the application and effects of new dressing to post-operation skin flap necrosis in breast cancer patients. Method: 20 breast cancer patients with post-operation skin flap necrosis were selected and assigned to the test group and controlled group. Silver ion dressing and moist healing theory were applied in the test group, while a traditional dressing change method was applied to the controlled group. Two groups were compared to each other in terms of incision healing time, number of dressing changes and treatment expense. Results: the test group is better than the controlled group in terms of incision healing time, number of dressing changes and treatment expense. Conclusions: compared to traditional dressing change methods, good effects can be achieved by treating the post-operation skin flap necrosis in breast cancer patients with silver ion dressing and moist healing theory. Skin flap necrosis causes the healing of the incision to be delayed. Necrotic tissues are plenty, number of dressing changes and duration are increased, repeated removal of gauze causes the wound to bleed and relatively large scars remaining after the healing of the wound surface are sometimes accompanied with dysfunction and this causes extremely physical and psychological pains and great economic burden to patients.
Nonlinear Vibration Analysis of Generator Rotor of a Military General Mobile Power Plant
Authors: Li Xiaoquan , He Jiangjiang , Zhao Yuwei , Cheng Yuemeng
Published: August 2019

The generator is the core component of the military general mobile electric power plant. In general, the rotor of generator has different degrees of eccentricity which affect the operation and even cause system failure. To explore the vibration characteristics of the rotor, the rotor of generator is taken as research object. A Jeffcott rotor system with cubic terms is established and reduced to Duffing equation. The multi-scale method is used to solve the first approximate solution of the forced vibration. The amplitude-frequency, phase-frequency response equation and the resonance conditions are obtained. The influence of different mechanical parameters on the lateral vibration and the main resonance of the system are studied: eccentricity and the stiffness have little effect on the amplitude variation, but have a great influence on the stability region; the main resonance frequency and the excitation change the magnitude of the system common amplitude value; the damping not only has a great influence on the common amplitude value, but also changes the response and phase.
Scheduling of Single Machine with Release Date to Minimize Multiple Objective Functions
Authors: Cheachan Hanan A , Ibrhim Manal H , Mohammed Hussam A A
Published: August 2019

The aim of this paper is to derive several upper bounds and a lower bound, these bounds to be used in a branch and bound method. Because of the computational complexity of the our problem, optimal and near-optimal solutions are obtained by developed algorithms. All algorithms are tested and computational experiments is given in tables.
The Action of some Subgroups of Symmetric Group S3n on An Invariant Markov basis
Authors: Mohammed Hussein Hussein S. , H. Majeed Abdulrahman
Published: August 2019

In this paper, we will find some subgroups H_1 and H_2 of symmetric group S_3n, n∈N and n≥2, such that the Markov basis B is H invariant for (25n^3-66n^2+41n) ×3×n - contingency tables with fixed two dimensional marginal, where B is the Markov basis. We will get another 3×n - contingency tables have same the Markov basis B by using the action of H on these contingency tables.
Development of the Interfaces for the Nonlinear Reaction-Diffusion equation with Convection
Authors: Abdulla Ugur G. , Aal-Rkhais Habeeb A.
Published: August 2019

We study the initial development and asymptotics of the interfaces and local solutions near the interfaces for the nonlinear reaction diffusion convection equation with compactly supported initial function. Depending on the relative strength of three competing terms such as diffusion, advection or absorption, the interface may shrink, expand or remain stationary. In this paper we focus only on two cases when the diffusion dominates and the interface expands and the other case when absorption term dominates and the interface shrinks. The significant methods that we used are rescaling and blow-up techniques.
Some Estimation Methods for New Mixture Distribution with Simulation and Application[c]
Authors: Mohammed Maysaa Jalil , Hussein Iden Hasan
Published: August 2019

In this paper, we investigate the New Mixture Distribution with discussion its studied mathematical and statistical properties. The classical methods (maximum likelihood, ordinary least square, and rank set sampling methods) are used to estimate the parameters of New Mixture with comparison between them using the mean square error for different sizes of simulation samples generated. Finally, we illustrate the usefulness of proposed by application of complete real data.
Fuzzy Topological Spectrum of a KU-Algebra
Authors: Kareem Fatema F. , Ali Reyadh.D. , Mostafa Samy M.
Published: August 2019

In the present paper, discuss the concept of fuzzy topological spectrum of a bounded commutative KU-algebra and study some of the characteristics of this topology. Also, we show that the fuzzy topological spectrum of this structure is compact and T1 -space.
Semi Eh-b-preinvexity and its applications to optimization problems
Authors: Majeed S N , Enad A A
Published: August 2019

In this paper, the class of semi E

h
-b-preinvex and pseudo E

h
-b-preinvex functions are defined as an extension of E-B-preinvex and h-preinvex functions. In this extension the functions E:ℝ
n
→ ℝ
n
, h: [0,1] → ℝ, and b:ℝ
n
× ℝ
n
× [0,1] → ℝ+ are taken into consideration. Various properties for the new functions as well as some properties and characterizations of quasi semi E-preinvex functions are discussed. Some optimality properties for semi E

h
-b-preinvex nonlinear optimization problems are proved.
On Estimation of the Stress – Strength Reliability Based on Lomax Distribution
Authors: Salman Abbas Najim , Hamad Alaa M.
Published: August 2019

The present paper concerns with the problem of estimating the reliability system in the stress – strength model under the consideration non identical and independent of stress and strength and follows Lomax Distribution. Various shrinkage estimation methods were employed in this context depend on Maximum likelihood, Moment Method and shrinkage weight factors based on Monte Carlo Simulation. Comparisons among the suggested estimation methods have been made using the mean absolute percentage error criteria depend on MATLAB program.
Survey of fungi found in books on the shelves of the libraries of the University of Qadisiyah – Iraq
Authors: Alshibly Majid Kadhim , zamily Ihsan ali al , Fazil Noor
Published: August 2019

The study included a survey of the fungal pollutants prevalent in the libraries of the University of Qadisiyah. The study included the Central Library and the Library of the Faculty of Science, Education, Literature, Veterinary Medicine, Law, Administration and Economics. For the purpose of study swabs were taking from Books on the library shelves. Wipes were cultured on the Sabouraud Dextrose Agar (SDA) medium and incubated at 25 ° C for one week to observe and diagnose growth. The results showed that there was contamination in the books in the libraries mentioned above. The Faculty of Science library was the most polluted, followed by the Central Library. The dominant fungi were Aspergillus, followed by Pnicillium, Rhizopus, Alternara and Fusarium. The effect of antiseptics on this isolated exhibited in the libraries mentioned above was examined by using Formalin, Dettol, Hydrex, Povidon and Povidon-Iodine. The results shows that there is a danger to the workers and those who return to the libraries, which confirms the existence of an urgent need to prevent the danger of these fungi and find effective solutions.
Physiological study of the effect Astaxanthin (shrimp extract ) on some biochemical markers in male rats induced by Formaldehyde
Authors: Abd AL-Shaybany Thafar Najim , AL-Dujaili Arshad Noori
Published: August 2019

The present study was conducted to show the protective and treated effects of astaxanthin in male rats induced by formaldehyde. The total numbers of male rats include ninety one (91) males, weighing (190-300) mg, aged (15-17) weeks. The animals were housed in animal house of college of science / University of Kufa from period February 2018 to July 2018. The animal were divided into two groups protective group total male rats were (36) and treated group (55) male rats.

The result sowed a significant increase (p< 0.05) in Asparatate tranasaminase(AST), Alanine transaminase(ALT) and Alkaline phsphatase (ALP) levels in formaldehyde group whene compared with control group and significant decrease (p< 0.05) in protective and treated groups of astaxanthin 250 and 500 mg/kg as compared with control group and formaldehyde groups. The study of biomarkers also showed a significant increase (p< 0.05) in Regucalcin(RUG), 8-hydroxy-2 deoxyguanosine(8-OHGD) and Myeloperoxidase(MPO0 levels in formaldehyde group as compared with control group and showed a significant decrease (p< 0.05) in all biomarkers when compared of astaxanthin & formaldehyde with formaldehyde group and non-significant difference (p<0.05 when compared with control group. The present study roles of Astaxanthin asprotective and treatment were documented by decrement by liver enzyme AST,ALT and ALP also some biomarkers also Creatinine after increment by formaldehyde.
Estimation of chemical components and caloric values for muscles of some local fish in Karbala province, Iraq
Authors: AL-Muhanna Mohammed W.H. , Mansour Akeil Jameil , AL-Asadi Sarmad A. M.
Published: August 2019

The present work aimed at conducting a comparative study of the chemical components of the muscles of four teleosts in two different regions of each Coptodon zillii belonging to the Cichlidae and members of Cyprinidae, Carabarbus luteus, Cyprinus carpio and Cyprinion macrostomum. This study concentrated on the determination of differences in the values of the chemical components of the muscles and calories for protein and lipid contents. In addition to this, it concentrated on the determination of the nutritional value of the studied fish. Samples were collected between November / 2018 and January / 2019 from Al-Hindiyia market in Karbala province, Iraq. The results showed that the protein content was higher in the region 1 (R1] compared to the region 2 (R2] while the lipid content of the R2 was higher than that for the R1. These results were associated with the red muscle ratio in the two regions. The total protein content was recorded 19.69% in C. zillii, 25.42% in C.luteus, 21.92% in C. carpio and 23.51% in C.macrostomum while the total lipid content was 4.25% in C. zillii, 2.23% in C. luteus, 4.10% in C. carpio and 6.42% in C. macrostomum. Therefore, the statistical results indicated significant differences (P<0.05] between the studied species in protein and lipid contents, while the differences were not significant (P>0.05] among the C.zillii, C.luteus and C.carpio in the values of moisture content and between the C.luteus and C.macrostomum in ash content values. According to the lipid content values in the studied fish muscles, the C. luteus fish (2.23%] were in a low-lipid fish while the C.carpio (4.10%], C.zillii (4.52%] and C.macrostomum fish(6.24%] were in a medium-lipid fish.
Effect of use aggregation pheromone to reducing the amount of pesticides that needed to control American cockroaches Periplaneta Americana (L). ( Blattodea : Blattidae)
Authors: Jawad Al-Qazwini Yarab Modhar , Al - Essa Rafid Abbas
Published: August 2019

The results indicated the effectiveness of Aggregation pheromone to reducing the amount of toxic substance to environment by mixing the pesticides with pheromone and less than recommended rates and gave effective results. The results indicated that the treatment of adult foods with Maxforce,insect growth regulator( Applaud)and Neem oil in different concentrations had an inverse relation between the concentrations used and the time duration needed to adult mortality. The results confirmed that the addition of the Pheromone Extract to the Pesticides had the effect of reducing the amount of the toxic substance entering the environment as well as reducing the time required for killing. The results indicate the adult mortality percentage of american cockroches when using 1 g of Maxforce reached to 100% after 12 days compare with two days when added 0.5ml.aggregation pheromone with pesticide that used.
TiO2 Nanoparticles Sensitized by Safranine O Dye using UV-A Light System
Authors: Jasim Khlowd Mohammed , Ahmed Luma M.
Published: August 2019

This study examined the photocatalytic decolorization of safranine O dye by using TiO2 nanopowder as a photocatalyst, under illumination with using artificial UV-A-light. The behavior of this reaction was pseudo first order and the maximum of removal was 88.176% in 100 min. at 30°C. The increased of reaction temperature enhances the photoreaction, with positive ΔH that equal to 20.552 kJ mol−1 and given low activation energy reach to 22.609 kJ mol−1. The Fenton reaction was applied in aqueous solution of this dye with the using TiO2 nanopowder and given maximum photo decolorization efficiency.
Vertical Growth Multi- Walled Carbon Nanotubes by the Catalytic Chemical Flame Deposition Method from Coal/Kerosene
Authors: Mohamed A. J. , Ibtesam A. , Firas H. A.
Published: August 2019

Multi- walled carbon nanotubes MWCNT were synthesized with vertical aligned V-MWCNT from mixture coal/kerosene/sulfur by the catalytic chemical flame deposition method CCFD with using homemade reactor. The condition of precipitation was accrued at 413 K in limited atmospheric oxygen with using sulfur as catalyst to enhance precipitation. The process of synthesis showed mixture of Coal/Kerosene did not produce MWCNTs without using sulfur. The product were characterized by X-ray diffraction analysis XRD, Raman spectroscopy, and scanning electron microscopy SEM. The analysis showed that multi-walled carbon nanotubes were growth vertically with length reach to more than 1.75 μm and diameter 4053 nm.
Influence of Some Nano-Inorganic Oxides on the Mechanical Properties of Epoxy Based Nano Composites
Authors: Shayea Iman Shuaib , Ugal Jalil R.
Published: August 2019

Epoxy nano composites were prepared using CuO, Fe2O3, and MgO as additives. Some mechanical properties (Tensile strength, Elongation%, Impact and Hardness) were measured These additives are capable to improve the mechanical properties for the resulting nano composites (in low percentages) such as tensile, impact, and hardness, while at the higher percentages the mechanical properties were reduced due the agglomeration of the additives.