bluuebunny/crossref_metadata_2025 huggingface dataset:
Structural and Mechanical Evaluation of a Nanocrystalline Al–5 wt %Si Alloy Produced by Mechanical Alloying
Authors: Dayani Davood , Shokuhfar Ali , Vaezi Mohammad , Jafarpour Rezaei Seyed , Hosseinpour Saman
Published: August 2017

High energy mechanical milling followed by hot-pressing consolidation has been used to produce nanostructured Al–5 wt %Si alloy. X-ray diffraction (XRD), scanning electron microscopy equipped with energy dispersive X-ray detector (SEM-EDX), Vickers hardness, and compression measurements were used to examine the effect of milling duration on microstructure and mechanical properties of the nanostructured consolidated alloys. Crystallite sizes and lattice strains were determined by X-ray peak broadening analysis using the Williamson-Hall (W-H) method. Increasing the milling time reduced the crystallite size, and the minimum crystallite size of about 33 nm was achieved for both consolidated and powdered samples after 50 h of milling. Based on the SEM-EDX observations, the best distribution of silicon into Al matrix was obtained after 20 h of milling and remained unchanged afterwards. Hardness of both consolidated and powder samples increased with milling time, which can be attributed to the reduction of crystallite size and the better distribution of silicon in the aluminum matrix. Similarly, increased milling time increased the yield and compressive strengths of consolidated samples.
Pietas Austriaca? The Imperial Legacy in Interwar and Postwar Austria
Authors: Binder Dieter
Published: August 2017

This paper aims to outline the specific Habsburg character of Austrian Catholicism through a study of Pietas Austriaca, the supposed Habsburg tradition of Catholic piety, and its role in the First and Second Austrian Republics. It analyzes the narrative of Austrian history presented by the Heldendenkmal, or Heroes’ Monument, which was erected in Vienna in 1934. Further, it argues that Pietas Austriaca was linked in the postwar period to a notion of Heimat (Home, Homeland) and served the needs of Austrian political Catholicism, which was seeking to recruit former National Socialists.
Computed tomographic study of safe implantation corridors in rabbit lumbar vertebrae
Authors: Harper Tisha , Joslyn Stephen , Whittington Julia , Hague Devon , Mitchell Mark , Schaeffer David , Moran Clara
Published: August 2017

Objectives: A study was performed to evaluate the lumbar vertebrae of domestic rabbits using computed tomography (CT) in order to identify safe corridors for implant insertion.

Methods: Computed tomography imaging of 20 adult New Zealand white rabbits was evaluated using three-dimensional multi -planar reconstruction, and safe corridors were determined. Following corridor determination, implant placement was performed, and imaging was repeated.

Results: The cranial and caudal endplates contained the majority of the vertebral bone stock, and were an average of 3.14 and 3.30 mm in length, respectively. The mean safe corridor angle was 62.9 degrees (range: 58.8–66.7), and the mean width of the corridor was 2.03 mm (range: 1.60– 2.07). Post-placement imaging revealed that 35% of the pins demonstrated errors of placement, most commonly canal impingement. Conclusions: The results of the corridor evaluation indicate that an insertion angle of approximately 60 degrees relative to the sagittal midline is appropriate for implant insertion in the lumbar vertebrae of New Zealand white rabbits. Additionally, due to the hourglass shape of rabbit vertebrae, the endplates provide maximal bone stock for implant purchase, so insertion should be attempted in these regions. However, the high percentage of errors in placement indicate the need to more clearly define entry points to access the canal, and highlight the challenges of appropriate placement in the small bones of rabbits.
Characterization of microsatellite markers for Broussonetia papyrifera (Moraceae)
Authors: Peñailillo Johany , Kuo Wenhsi , Olivares Gabriela , Silva‐Poblete Gerardo , Peña‐Ahumada Barbara , Muñoz Sofía , Moncada Ximena , Chung Kuo‐Fang , Seelenfreund Daniela , Seelenfreund Andrea
Published: August 2017

Premise of the study:

Broussonetia papyrifera (Moraceae) is native to Asia and is used as a medicinal plant and as a source of fiber for making paper. It was dispersed into the Pacific region as a fiber source for making nonwoven textiles (barkcloth). Microsatellites were developed to trace the human‐mediated dispersal of this species into the Pacific region.

Methods and Results:

A set of 36 microsatellites was isolated and initially assayed on 10 accessions to assess polymorphism. We found that 20 markers were polymorphic, with the number of alleles per marker ranging from four to 35 in 70 accessions genotyped from three Asian populations. Observed and expected heterozygosities ranged from 0.04 to 0.85 and from 0.19 to 0.94, respectively. These markers were tested in four Moraceae species and one Rosaceae species.

Conclusions:

These markers will be useful for the assessment of genetic diversity in B. papyrifera. They show low transferability to other species tested.
Medical Specialties With Highest Percentages Of Complaints In The State Of Acre, Brazil
Authors: Ribeiro Dilza Teresinha Ambros , Gallo José Hiran , Rego Guilhermina
Published: August 2017

Background: The present study had the objective of surveying the medical specialties most commonly involved in complaints reported to the Regional Medical Council (CRM) of the state of Acre, between the years 1993 and 2009.

Method: Data were gathered from the CRM by means of a questionnaire. This yielded 121 complaints. A deductive method was applied, with quantitative analysis. The results indicated that the specialties most susceptible to “medical errors” were general practice and gynecology.

Findings: The results indicated that the specialties most susceptible to “medical errors” were general practice and gynecology.

Conclusion: It is hoped that these data will be useful to the State Health Department for justifying greater investments in these fields of scientific knowledge and for better professional training.

Keywords: Acre; complaints; specialties; ethics.
Investment Efficiency Evaluation of Customer Relationship Management System: Theoretical and Practical Aspects of Return on Investment Methodology Application
Authors: Jasilionienė Regina , Tamošiūnienė Rima
Published: August 2017

Customer relationship management (CRM) has been increasingly adopted by companies as the core of IT – driven business strategy and firms have started to invest in CRM. However, the rate of successful CRM implementations is about 30%. Many enterprises pursue expensive CRM initiatives without first understanding of the challenges and costs involved. This approach often results in CRM projects that fail to meet measurable benefit objectives. Evaluating costs and benefits associated with CRM systems acquiring and implementation and applying financial measurement methodologies can help a company make the right CRM investments solution and build a compelling justification for its CRM project. Return on investment (ROI) financial measurement methodology, its theoretical and practical aspects are analyzed in this study. Authors of this paper provide a detailed list of CRM cost categories, which can assist an organization to easily calculate its CRM system acquisition and ongoing spending. Also the authors of this paper present survey results of CRM system costs and investment efficiency evaluation in Lithuanian companies.
Optimized Trajectories to the Nearest Stars Using Lightweight High-velocity Photon Sails
Authors: Heller René , Hippke Michael , Kervella Pierre
Published: August 2017

New means of interstellar travel are now being considered by various research teams, assuming lightweight spaceships to be accelerated via either laser or solar radiation to a significant fraction of the speed of light (c). We recently showed that gravitational assists can be combined with the stellar photon pressure to decelerate an incoming lightsail from Earth and fling it around a star or bring it to rest. Here, we demonstrate that photogravitational assists are more effective when the star is used as a bumper (i.e., the sail passes “in front of” the star) rather than as a catapult (i.e., the sail passes “behind” or “around” the star). This increases the maximum deceleration at α Cen A and B and reduces the travel time of a nominal graphene-class sail (mass-to-surface ratio

) from 95 to 75 years. The maximum possible velocity reduction upon arrival depends on the required deflection angle from α Cen A to B and therefore on the binary’s orbital phase. Here, we calculate the variation of the minimum travel times from Earth into a bound orbit around Proxima for the next 300 years and then extend our calculations to roughly 22,000 stars within about 300 lt-yr. Although α Cen is the most nearby star system, we find that Sirius A offers the shortest possible travel times into a bound orbit: 69 years assuming 12.5% c can be obtained at departure from the solar system. Sirius A thus offers the opportunity of flyby exploration plus deceleration into a bound orbit of the companion white dwarf after relatively short times of interstellar travel.
The Second Data Release of the KODIAQ Survey
Authors: O’Meara J. M. , Lehner N. , Howk J. C. , Prochaska J. X. , Fox A. J. , Peeples M. S. , Tumlinson J. , O’Shea B. W.
Published: August 2017

We present and make publicly available the second data release (DR2) of the Keck Observatory Database of Ionized Absorption toward Quasars (KODIAQ) survey. KODIAQ DR2 consists of a fully reduced sample of 300 quasars at

observed with HIRES at high resolution (36,000 ≤ R ≤ 103,000). DR2 contains 831 spectra available in continuum normalized form, representing a sum total exposure time of ∼4.9 megaseconds on source. These co-added spectra arise from a total of 1577 individual exposures of quasars taken from the Keck Observatory Archive (KOA) in raw form and uniformly processed. DR2 extends DR1 by adding 130 new quasars to the sample, including additional observations of QSOs in DR1. All new data in DR2 were obtained with the single-chip Tektronix TK2048 CCD configuration of HIRES in operation between 1995 and 2004. DR2 is publicly available to the community, housed as a higher level science product at the KOA and in the igmspec database (v03).
GASP. IV. A Muse View of Extreme Ram-pressure-stripping in the Plane of the Sky: The Case of Jellyfish Galaxy JO204
Authors: Gullieuszik Marco , Poggianti Bianca M. , Moretti Alessia , Fritz Jacopo , Jaffé Yara L. , Hau George , Bischko Jan C. , Bellhouse Callum , Bettoni Daniela , Fasano Giovanni , Vulcani Benedetta , D’Onofrio Mauro , Biviano Andrea
Published: August 2017

In the context of the GAs Stripping Phenomena in galaxies with Muse (GASP) survey, we present the characterization of JO204, a jellyfish galaxy in A957, a relatively low-mass cluster with

M
=
4.4
×

10

14

M

⊙

. This galaxy shows a tail of ionized gas that extends up to 30 kpc from the main body in the opposite direction of the cluster center. No gas emission is detected in the galaxy outer disk, suggesting that gas-stripping is proceeding outside-in. The stellar component is distributed as a regular disk galaxy; the stellar kinematics shows a symmetric rotation curve with a maximum radial velocity of 200 km s−1 out to 20 kpc from the galaxy center. The radial velocity of the gas component in the central part of the disk follows the distribution of the stellar component; the gas kinematics in the tail retains the rotation of the galaxy disk, indicating that JO204 is moving at high speed in the intracluster medium. Both the emission and radial-velocity maps of the gas and stellar components indicate ram-pressure as the most likely primary mechanism for gas-stripping, as expected given that JO204 is close to the cluster center and it is likely at the first infall in the cluster. The spatially resolved star formation history of JO204 provides evidence that the onset of ram-pressure-stripping occurred in the last 500 Myr, quenching the star formation activity in the outer disk, where the gas has been already completely stripped. Our conclusions are supported by a set of hydrodynamic simulations.
Mid-infrared Variability of Changing-look AGNs
Authors: Sheng Zhenfeng , Wang Tinggui , Jiang Ning , Yang Chenwei , Yan Lin , Dou Liming , Peng Bo
Published: August 2017

It is known that some active galactic nuclei (AGNs) transit from Type 1 to Type 2 or vice versa. There are two explanations for the so-called changing-look AGNs: one is the dramatic change of the obscuration along the line of sight, and the other is the variation of accretion rate. In this Letter, we report the detection of large amplitude variations in the mid-infrared luminosity during the transitions in 10 changing-look AGNs using the Wide-field Infrared Survey Explorer (WISE) and newly released Near-Earth Object WISE Reactivation data. The mid-infrared light curves of 10 objects echo the variability in the optical band with a time lag expected for dust reprocessing. The large variability amplitude is inconsistent with the scenario of varying obscuration, rather it supports the scheme of dramatic change in the accretion rate.
Les relations franco-autrichiennes dans la seconde moitié du xviii e siècle ou les faux-semblants du renversement des alliances
Authors: Michaud Claude
Published: August 2017

Le renversement des alliances de 1756 fut-il une révolution diplomatique mettant un terme au séculaire antagonisme entre les Valois puis les Bourbons, et la maison d’Autriche ? Dans les faits, le lobby anti-autrichien ne désarma pas. Au lendemain de la guerre de Sept ans, pendant laquelle l’engagement militaire de la France sur le continent avait été limité, les réticences françaises, clairement exprimées par le ministre Vergennes, se muèrent en franche hostilité en réponse aux initiatives « expansionnistes » de Joseph II. Au terme du règne de Louis XVI, l’alliance n’avait plus aucune réalité. La Révolution ne fut pas une rupture avec une tradition d’Ancien Régime si ancrée. En dépit des efforts de Talleyrand pour préserver la monarchie de Vienne comme élément essentiel de l’équilibre européen, certes au prix d’une migration vers l’est de son centre de gravité, le Directoire puis Napoléon Bonaparte poursuivirent la tradition d’hostilité à l’Autriche. Mais la continuité n’est que partielle. La France de Louis XV et de Louis XVI ne recherchaient pas d’accroissements extérieurs, ni les frontières naturelles, à la différence de la France révolutionnaire et impériale.
The Doctor of Nursing Practice in the Workplace: Now What?
Authors: Bleich Michael R.
Published: August 2017

The rapid proliferation of Doctor of Nursing Practice programs and graduates has proliferated to create a critical mass of practice scholars in the workplace. Addressed in this article is how to optimize the knowledge, skills, and abilities of the practice scholar and how to strengthen clinical learning for those completing the practice hours and the doctoral project in the workplace.

J Contin Educ Nurs.
2017;48(9):392–394.
La colección artística del canónigo Francisco Ruiz Noble y la serie de la Vida de José de Antonio del Castillo
Authors: Gómez Román Ana María
Published: August 2017

Francisco Ruiz Noble (Guadix, 1630-Granada, 1694) canónigo doctoral del templo metropolitano de Granada, fue un influyente religioso que cosechó el aprecio de otras tantas figuras dentro del ámbito cultural de la época. Hacedor de un gran bagaje intelectual y con refinados gustos en materia artística fue dueño de una importante colección de pintura en la que se encontraban representados artistas de la talla de Pedro Atanasio de Bocanegra, Sebastián Martínez, José de Cieza o Antonio del Castillo y su serie de la Vida de José (Museo Nacional del Prado).
Failure Modes of the Biometallic Materials - Case Study
Authors: Ghiban Brandusa
Published: August 2017

Hip fractures/arthrosis were, still are and will be a challenge for the orthopedic surgeon. In this paper we conducted a case study on a rod used for hip replacement due to coxartrosis. The implant was used for hip replacement for NC patient aged 82 years. After twelve months the patient returns for the ablation of osteosynthesis material. Clinical and strengthen the fracture hip is found radiologic hypertrophic and degradation plaque. It was used a rod implant, on which were made following investigations in order to establish the causes that led to the fracture, namely: determining the chemical composition through spectral analysis, analysis macrostructural in stereo, microstructural analysis optical microscope metallographic respectively analysis fractogr aphic electron microscope streak. Complex analysis of the fracture surfaces of the hip prosthesis has led to the ultimate conclusion that the material has been made the hip prosthesis is inadequate chemical purity satisfactory embedding, which has led to breakage within an area of non-homogeneous structure.
SEM Analysis of the Interface of Five Adhesive Systems
Authors: Sucala Diana , Sarosi Codruța , Cuc Stanca , Moldovan Marioara , Popa Catalin
Published: August 2017

The aim of this study was to investigate the interface ultrastructure at dentin and hybrid layer formed by novel adhesives with TiO2 nano-fillers. Nano-fillers have shown outstanding mechanical properties and they are widely used as reinforcing materials associated with polymeric matrices for high performance applications. Twenty extracted non carious human teeth were utilized for evaluation of the bonded interface using scanning electron microscopy. The experiments used four novel adhesives (noted A1, A2, A3, A4). Phosphoric acid (5s, 37%) and a commercial resin composite Herculite XRV (Kerr) filling were used for the surface treatment. The interface was studies using scanning electron microscopy (SEM) using a microscope Inspect F-FEI Company. The experimental results indicated the main benefits and disadvantages of the investigated adhesives systems. SEM of the adhesive dentin interface revealed a HAp (hydroxyapatite) – rich and homogenous hybrid layer. This layer produced a favourable sealing of damaged dentin.
Painful Complications after Pelvic Floor Reconstructive Surgery in Transobturator Suburethral Vaginal Slings
Authors: Boț Mihaela , Vlădăreanu Simona , Vlădăreanu Radu , Petca Răzvan , Zvâncă Mona , Radu Dan Cristian , Petca Aida
Published: August 2017

Stress incontinence is a major social and health problem for middle-aged and elderly women, with an increasing prevalence as life expectancy increases. Reconstructive surgery techniques using vaginal mesh slings of polypropylene (synthetic grafts) have diversified in recent years, but at the same time various postoperative complications have been reported, among the frequent ones being pelvic pain, thigh pain and dyspareunia. The pain mechanism is not fully understood, but pathophysiological theories describe the pain as closely related to the structure, density, size and elasticity of the vaginal mesh, and the inflammatory response of the host.
Synthetic Mesh Used in Gynecologic Reconstructive Surgery for Pelvic Floor Disorders
Authors: Brătilă Elvira , Brătilă Petre , Comandașu Diana , Cîrstoiu Monica , Bohîlțea Roxana , Boț Mihaela , Mehedințu Claudia
Published: August 2017

Pelvic floor disorders including stress urinary incontinence and pelvic organ prolapse represent a challenge for gynecologist or urogynecologist even nowadays. Conservative treatment for these conditions proves its effectiveness only in few cases selected from early forms of incontinence or prolapse the most cases being solved surgically. The introduction of the procedure imagined by Petros and Ulmsten, known as TVT (Trans Vaginal Tape) in which the medium urethra is supported by a synthetic tape produced in 1996 a revolution in the surgical treatment of stress urinary incontinence. Radical changes also appeared in pelvic organ prolapse surgery extrapolating the hernia repair procedure by using synthetic mesh. After nearly 20 years of experience the mesh surgery is today a common practice in urogynecology. Between 2011 and 2015 we operated in private practice a total number of 297 cases of which 187 cases of stress urinary incontinence and 110 cases of pelvic organ prolapse. From these 86 (78,1%) cases were represented by cystoceles, associated with early apical prolapse or rectoceles, 18 (16,3%) cases by apical prolapse (grade III-IV) and 6 (5,4%) cases by posterior compartment prolapse alone. We performed mesh surgery in 32 (29%) cases represented mainly by anterior compartment prolapse. In 6 (18,7%) cases we founded mesh extrusion which required partially resection. In two cases we performed large resection of anterior vaginal wall required grafting with acellular second generation graft. In all cases with mesh extrusion the biomechanical analysis revealed significant decrease in effective porosity of the mesh due to excessive tensioning or folding of the mesh. The use of mesh in stress urinary incontinence and pelvic organ prolapse represent a justified alternative in selected cases. The specific complications due to meshes are more frequent in prolapse surgery compared to stress urinary incontinence. In all cases altered effective porosity due to technical defects in surgery represents the leading cause.
Advanced Engineering in Orthopedic Surgery Applications
Authors: Popescu Diana , Lăptoiu Dan , Marinescu Rodica , Hadar Anton , Botezatu Iozefina
Published: August 2017

The paper reports the use of advanced engineering tools, techniques and manufacturing process for the preoperative planning, visualization and simulation of complex osteotomy of a diabetic foot (Charcot osteoarthropathy). Two case studies focused on the same clinical data are illustrating the use of medical modeling techniques, reverse engineering and Additive Manufacturing technology in the development of 3D printed anatomical model and customized surgical cutting guides, as well as the use of Augmented Reality (AR) tools for enhancing the communication and information exchange between surgeons, and between surgeons and engineers. A good and accurate communication surgeon-engineer in identifying and selecting anatomical landmarks and supporting surfaces, in establishing the resections trajectories and K-wires positions proved mandatory for the guides’ design process. The importance of using both 3D virtual models, AR models and physical models as collaboration tools is also discussed.
Multi-Objective Optimization Design of CFRP Winding Mortar Barrel with Metal Liner Based on MOPSO
Authors: Li Bo , Xiong Chao , Zhang Yong Shun , Gao Jian Xun
Published: August 2017

A model of composite mortar barrel made of carbon fibre reinforced plastic (CFRP) jacket and steel liner was developed based on the finite method. The multi-objective particle swarm optimization (MOPSO) was employed for the multi-objective design of composite mortar barrel during design processing. The winding angle of carbon fibre and the thickness of composite layers are defined as optimization variables. The fundamental frequency and structure weight of barrel are defined as optimization objectives. The Pareto solution set of composite mortar barrel is obtained by MOPSO. The corresponding design solution of composite mortar barrel is improved in stiffness and weight.
Properties of Alumina-Titania Coating Formed by a New Multi-Chamber Gas-Dynamic Accelerator
Authors: Kovaleva M.G. , Prozorova Mayya S. , Arseenko M.Yu. , Vagina Olga N. , Sirota Viacheslav V.
Published: August 2017

Thermal-sprayed alumina–titania coatings (Al2O3:Ti wt ratio = 60:40) were prepared by a new multi-chamber gas-dynamic accelerator. The coatings were examined by using scanning electron microscopy, X-ray phase analysis and Vickers hardness tester at a test load 0.2 kg. The coating was well-adhered with corrosion-resistant steel substrate. The results show that the microstructure of the alumina–titania coatings consists of areas with different degrees of melting: the lamella built up from the fully melted particles of the powder, and partially melted areas. The developed coating is highly dense (porosity is less than 0.7%). Research results show that hardness of alumina–titania coatings (Al2O3:Ti wt ratio = 60:40) can achieve up to 655 HV0.2 and the specific wear rate of alumina-titania coatings is 52.40∙10-5 mm3 (m∙N)-1.
Temperature Characteristics of Silicon-Polymer Hybrid Material Photonic Resonator
Authors: Uddin Mohammad Rakib , Newaz S.H.S. , Abdul Hamid Zainidi Haji , Won Yong Hyub
Published: August 2017

This paper presents temperature sensitivity analysis of a silicon-polymer hybrid photonic micro-ring resonator. Photonic micro-ring resonators have hailed for their potential used in the next generation optical communications. However, like any other optical devices, temperature fluctuations alter the functionality of the micro-ring resonator. Hence, this paper provides a proposal for solution to minimize the temperature sensitive effect on the resonance characteristics. The temperature sensitivity effect of the pure silicon micro-ring resonaltor has been investigated. It is shown that the pure silicon micro-ring resonator is very sensitive to temperature. We added a negative thermo-optic polymer material with the positive thermo-optic silicon material to investigate the efeect of temperature sensitivity. Simulation tool Lumerical solution has been used to simulate the ring resonator. A polymer material of LFR is used to analyze the temperature effects. The hybrid composition of silicon-polymer were as 30%-70%, 40%-60%, 50%-50% and 60%-40% to investigate the temperature effect. The simulation was carried out using a ring size of 5 um, 10 um, 15 um and 20 um. The results show that the temperature insensitive ring resonator is possible with a 42% LFR polymer mixwd with 58% silicon.
TiO2-Doped Single-Mode Fiber as Active Material for Raman Lasers
Authors: Felinskyi Georgii S. , Serdeha Iryna V. , Grygoruk Valeriy I.
Published: August 2017

The properties of TiO2-doped fiber are considered as optoelectronic material in our work. The advantages of such fiber have been studied with the aim of its application to active medium in Raman fiber lasers. The comparison of spontaneous Raman spectra and corresponding gain profiles in TiO2-doped and GeO2-doped fiber is presented. Raman gain profiles were obtained over a broad spectral range of Stokes shifted frequencies up to 1400 cm-1(42 THz). The spectral decomposition using multimode Gaussian components has been performed for both Raman gain profiles. High accuracy analytic form of Raman gain profile of TiO2-doped fiber is obtained using 12 components. The pump power of Raman gain threshold is introduced as the function of wavelength within the telecommunication windows for both fiber types. Our spectroscopic analysis allows presenting the numerical results on lasing bandwidth and Raman gain threshold inTiO2-doped single-mode fiber. It has been shown that the lasing bandwidth in TiO2-doped fiber may be almost twice wider than the lasing bandwidth in standard GeO2-doped fiber.
Acoustic Emission in Stainless Steel End Milling with Carbide Tools
Authors: Odedeyi Peter Babatunde , Abou-El-Hossein Khaled , Liman Muhammad M. , Jumare Abubakar I. , Lukman Abdulqadir N.
Published: August 2017

Tool wear is a complex phenomenon, it worsens surface quality, increases power consumption, and causes rejection of machined parts. Tool wear has a direct effect on the quality of the surface finish of the workpiece, dimensional precision and ultimately the cost of the parts produced. In modern automated manufacturing machines, tool monitoring system for automated machines should be capable of operating on-line and interpret the working condition of machining process at a given point in time. Therefore, there is a need to develop a continuous tool monitoring systems that would notify operator the state of tool in order to avoid tool failure or undesirable circumstances. This study therefore uses acoustic emission (AE) sensing techniques, signal processing and Artificial Neural Networks (ANN) frameworks to model and validate the machining process. The AE showed effects of tool breakage and ANN predictions closest to the experimental cutting parameters were obtained. It was also shown that the ANN prediction model obtained is a useful, reliable and quite effective tool for modeling tool wear of carbide tools when working on stainless steel. Thus, the results of the present research can be successfully applied in the manufacturing industry to reduce the time, energy and high experimental costs.
Influence of Nitrogen Atmosphere on Weld Nugget Morphology during Resistance Spot Welding of 304L Stainless Steel
Authors: Hafez Khalid M. , Yusoff Wan Ahmad Yusmawiza , Fathy N. , Ramadan M. , Ismail Mona
Published: August 2017

The Resistance Spot Welding is most widely used as a joining process for stainless sheets. AISI 304L austenitic stainless steel offers the optimum combination of corrosion resistance and mechanical strength. Improving the microstructure of the spot-welded nugget has a great effect on the quality of sheet weld joints. The current research presents the influence of using nitrogen atmosphere on macro and microstructure morphologies of the spot-welded nugget of AISI 304L stainless steel. Results show that using nitrogen atmosphere as shielding gas improves the appearance and color matching of the welded nugget with base, but on the other hand, nitrogen atmosphere reduces the nugget size. In addition to the reduction of the total ferrite in the spot weld nugget, Skeletal d-ferrite / total ferrite ratio increases by using nitrogen shielding gas due to nitrogen diffusion in fusion welded nugget zone.
Study on Ozone Bleaching of the Ammonium Sulfite Wheat Straw Pulp
Authors: Dong Hong Xiang
Published: August 2017

With the rapid economic development, pulp and paper industry has changed from resource consumption to production of clean transformation. This paper is based on the single concentration (7.4%) ozone bleaching, while prolonging the reaction time of a single variable, ozone lignin removal efficiency and the impact on the fiber. After a lot of research and experiments repeatedly found that bleaching whiteness can reach 75.5% (%ISO whiteness), with the increasing of the degree of the tear strength in the ozone bleaching time declining, and finally to 240mN. Breaking length increased first and decreased state of change can be up to 2.1445km. Pulp hardness with KMnO4 value represents the final reach 2.65. The best bleaching time should be 150 minutes, it can be made into pulp and paper all aspects of performance to achieve the best state.
An Investigation on the Adsorbent Material of Fly Ash
Authors: Fu Dan
Published: August 2017

In this paper, the properties of fly ash were investigated. The particle size distribution, the fourier transform infrared spectroscopy (FTIR), the morphology, the surface area, pore volume, average pore diameter and the modification methods of fly ash were examined. The study indicated that the particle size of fly ash was about 0.2 µm, the particle shape was irregular. FTIR spectrums of fly ash modified were basically the same and the functional groups of fly ash were rarely. SEM of fly ash showed that the particles were similar to lamellar structure and the particle shape was irregular. The BET specific surface area of fly ash modified by H2O2 was 41.63 m2 /g. The fly ash of modified by H2O2 had better adsorption performance than other modified methods. The modification can effectively improve the adsorption performance of fly ash. The result indicated that the fly ash as adsorbent for wastewater treatment was feasible.
The Preparation of Magnetic Particles and Optimization Research
Authors: Wang Jia Bin , Zhang Dong , Li Tian Hang
Published: August 2017

To resolve the problem of weak magnetic field strength of magnetic materials in wastewater treatment, the methods of preparation of magnetic particles was explored. The main influencing factors of magnetic field strength were investigated using single factor experiment. Results suggested that optimal preparation conditions were as follows: 2% silane coupling agent, 12% PVA/ SA, magnetizing time 1 h, and 5% nano Fe3O4 powder. Magnetic particles were prepared based on the optimal conditions and the magnetic field strength was 0.85mT.
Effect of Aging on Characterization of Sr-Modified Stir Cast A356/Al2O3 Composite
Authors: Zulfia Syahrial Anne , Pancasakti Ahadya
Published: August 2017

A356/Al2O3 composites with Sr modifier were produced by stir casting process. The composites were further heat treated to obtain light material with superior characteristics through precipitation hardening of Mg2Si precipitate. The A356 alloy is reinforced with 10 %Vf Al2O3 micro particles. Small amount of Sr is added to modify eutectic silicon morphology from plate-like into fibrous. The composites were prepared by stir casting method in order to obtain dispersed reinforcement particulates within the matrix. T6 heat treatment is employed to the fabricated composites for 2, 4, 6, 8, and 10 hours of aging time to improve the properties. The result reveals that an optimum values of tensile strength, impact strength, hardness and wear rate are achieved by conducting 6 hours of aging. Longer than that, the properties will decline as a result of incoherent phase domination. Small amount of Sr is shown to be able to change the morphology of eutectic silicon from plate-like into fibrous. However, Fe-intermetallics formation, porosity, and negative effect from solution treatment due to improper technical condition during heat treatment are found to contribute on deterioration of mechanical properties of the material.
Strength of Modified Concretes Curing without Care in Dry and Hot Climate Conditions
Authors: Koroteev Dmitry D. , Kharun Makhmud , Galishnikova Vera V. , Stashevskaya Nadezhda A.
Published: August 2017

The speed of concrete curing and design concrete strength depend on the environmental conditions of construction site. Dry and hot climate conditions intensify the process of water evaporation from concrete and cause the concrete shrinkage and the loss of the potential concrete strength. The research work is devoted to study the layer changes of the concrete strength; determination of the minimum period of care for concrete; assessment of negative impact of dry and hot climate conditions on modified concretes, prepared on the composite binders with various chemical additives. The results and methodology, as well as the information about concrete composition and the boundary conditions of the experiments are given in the research work. The obtained research results show that chemical additives and composite binders with low water consumption contribute to get the design strength in spite of the environmental conditions. They also allow concluding that the minimum period of care for concrete should be determined by not the time of its curing, but the critical strength, which it gets to the moment of ending of caring. This concrete strength is able to resist various destructive processes.
Thermal Performance Test and Improvement for Phase Change Material Composite through Nucleating Additive
Authors: Zhang Yin , Ming Yang , Zhang Ming Shan
Published: August 2017

Solid-liquid phase change material (PCM) is of high phase change heat and application potentials of thermal energy storage. In this paper, the thermal performance of PCM composites of sodium acetate and urea are investigated through experiment. Moreover, the main thermal-physical properties of such PCM composites with different mixing mass ratios are obtained through T-history method. The results show that with the rising urea mass fraction, both the phase change temperature and latent heat of fusion (enthalpy) decline. It also indicates that strontium sulfate is an effective nucleating additive to decrease super-cooling degree during solidification process for such composite PCM. This work is of high significant in improving the thermal performance of PCM composite and extending its applications.
Preparation and Properties of Additive Polysiloxane/POSS Hybrid Composites
Authors: Mu Qiu Hong , Peng Dan , Wang Feng , Ju Wei , Zhang Fang Zhi
Published: August 2017

Octavinyl polyhedral oligomeric silsesquioxane (POSS) were used to hybrid with polysiloxane matrix by two methods, physical blending (PB) and chemical modification (CM). Mechanical, thermal and morphological properties of composites were studied by changing the percentage of POSS and investigated by thermogravimetric analysis (TGA), scanning electron microscopy (SEM) and wide angle X-ray diffraction (XRD) measurements. The results show that the hybrid composites have better mechanical and thermal property than the parent polymer matrix, and CM-prepared composites show better reinforcing role compared with PB-prepared samples. The CM method was hydrosilylation reaction of octavinyl-POSS with hydrogen terminated poly(methylphenylsiloxane) (HPMPS) and the FTIR and NMR results of modified POSS revealed that hydrosilylation reaction took place successfully but was not complete. The modified POSS consisting partial segments of HPMPS attached to the central POSS core showed better distribution in matrix than PB-prepared POSS hybrid composites.
Preparation and Characterization of Waterborne Fluorinated Polyurethane-Acrylate
Authors: Yang Wei , Song Ming Jian , Xie Bin , Zhou Yue Jing
Published: August 2017

Fluorinated urethane-acrylic monomer (FUA) was synthesized using toluene diisocyanate (TDI), 1H, 1H, 2H, 2H-Perfluorooctanol(FOH) as well as hydroxyethyl methacrylate(HEMA), and then applied to prepare waterborne fluorinated polyurethane-acrylate (FPUA) via emulsion polymerization. The effect of FUA content on surface properties of latex films was evaluated by means of nuclear magnetic resonance (1H NMR), atomic force microscope (AFM) and water contact angle test. It is shown that FUA monomer content is related to phase separation of the film surface and water contact angle. As FUA content was increased from 0 wt% to 11.8 wt%, water contact angle was increased from 84° to 104.5°. Further increase of FUA has little influence on surface hydrophobicity but obvious effect on surface phase separation, and the reason which led to this phenomenon is described.
An Experimental Study on the Structural Behavior of Water and Wastewater Supply GFRP Pipe
Authors: Kim Sun Hee , Yoon Soon Jong , Choi Won Chang
Published: August 2017

In this paper, the results of experimental and analytical investigations pertaining to the structural behavior of glass fiber reinforced polymer plastic (GFRP) pipes are presented. GFRP is assumed as an orthotropic material. Mechanical properties along the longitudinal and hoop direction of the pipes are determined by the tension and compression tests. The parallel plate loading tests for the GFRP pipes were conducted to findthe relation between load and ring deflection. Inaddition, the finite element analysis (FEA) for the GFRP pipes was conducted using the material properties obtained from test in the study. The numerical results obtained by the finite element method show good agreement with the parallel plate loading test results for GFRP pipes.
Study on the Development of AlN Particles Synthesized by Gas/Liquid Reaction In Situ
Authors: Hai Nguyen Hong , Nguyen Quoc Tuan
Published: August 2017

AlN particles can be synthesized by blowing Nitrogen gas into liquid metal. At high temperature Nitrogen molecules decompose to atoms and react with Al to create AlN. EDX diffraction shows that weight ratio of the particles fully coincides with the ratio of standard atomic mass between Al and N (about 2), confirming that the particles are AlN. The SEM images show that AlN particles size varies from several hundred nanometers to some micrometers, depending on the contact time between gas bubbles and liquid metal. A simple model shows that the growth rate of the AlN particles (0.148 nm/s) at the early stage is only a half of that at finishing stage (0.305 nm/s), this may be due to the difficulty of the nucleation at the early stage. The formation rate of AlN was calculated based on the X-ray diffraction and shows the same tendency, as the growth rate.
Fabrication and Characterization of Magnetic Nanocomposite Powders in Hematite-Ca System by Mechanical Alloying
Authors: Lee Chung Hyo
Published: August 2017

We have applied mechanical alloying technique to produce magnetic nanocomposite material using a mixture of Fe2O3 and Ca powders at room temperature. An optimal ball milling and heat treatment conditions to obtain magnetic α-Fe/CaO composite with fine microstructure were investigated by X-ray diffraction, scanning electron microscope and vibrating sample magnetometer measurements. We have revealed that the magnetic α-Fe /CaO nanocomposite powders can be produced by solid state reduction during ball milling. It is found that α-Fe/CaO nanocomposite powders in which CaO is dispersed in α-Fe matrix with a grain size of 45 nm are obtained by mechanical alloying of Fe2O3 with Ca for 5 hours. The saturation magnetization of ball-milled powders increases with increasing milling time and reaches to a maximum value of 65 emu/g after 7 hours of MA. The average grain size of a-Fe in 5 hours MA powders estimated by diffraction line-width are gradually decreased with increasing milling time, and tend to reach at 45 nm. The magnetic hardening due to the reduction of the α-Fe grain size by MA is also observed.
A Method for the Production of Large Sized Al-B4C-Al2O3np Nanocomposites through Liquid-State Process
Authors: Liu Wei , Li Qiu Lin , Liu Wei , Shu Guo Gang , Sun Qi , Ye Chang Qing
Published: August 2017

The paper introduces a new method to produce large sized Al-B4C-Al2O3np composites, which combines ball milling to prepare Al2O3np/Al mixed powder and semi-solid casting to contribute the injection of Al2O3np/Al mixed powder into the melt. The deformation performance of Al2O3np and micro-Al through ball milling with different Al/Al2O3np ratios, different milling time and different balls were studied respectively. It was revealed that micro-Al particles were milled from twisted and crimpled foil pieces to shuttles with Al2O3np embedded on it through 4h milling with 10mm balls. And we consider it as the best bonding between Al2O3np and micro-Al we could attain. And a plate of 25kg of Al-B4C-Al2O3np composite was fabricated successfully with the injection of the Al2O3np/Al mixed powder. Spherical Al2O3np of 300nm and needle-like TiB2 with 200nm in radius and 800nm-4μm in length were found in SEM photographs. Tensile properties of Al-B4C-Al2O3np composites were tested at room temperature and high temperature. It was showed higher mechanical properties than Al-B4C composites at room temperature and elevated temperature. Particularly, a 40% increase of UTS of Al-15wt.% B4C-1wt.%Al2O3np at 350°C was observed.
Multiple papular lesions in a patient with HIV and/or AIDS and coinfected with hepatitis B virus: Amyloidosis
Authors: Demiraslan Hayati , Deniz Kemal , Doganay Mehmet
Published: August 2017

Introduction: The most common form of systemic amyloidosis is amyloid A induced by a chronic inflammation. In HIV-infected patients, elevated serum amyloid A levels might be associated with chronic inflammation.Patient presentation: A 43-year-old male patient was admitted to hospital with a complaint of papular lesions around his eyes, existing for four months. The patient is receiving antiretroviral therapy. HIV RNA was undetectable, and the CD4 count was 770 cells/mm3. He suffered from a bladder carcinoma for four years. On examination, periocular, perioral and anogenital papules, papular lesions in the meatus of external auditory canal, and intranasal polyps were observed.Management: Microscopic examination of the biopsy material taken from the periocular lesion and then from perianal polyps revealed eosinophilic deposition, and stained positively by Congo red. Serum amyloid A level was negative. Antiretroviral therapy was continued.Conclusion: A rare form of amyloidosis in a patient with HIV and/or AIDS and coinfected with hepatitis B virus (HBV) was presented here with cutaneous and mucosal lesions.
APLICAÇÃO DO MFV E CARACTERIZAÇÃO DAS ATIVIDADES DE FLUXO DO PROCESSO DE EXECUÇÃO DE ALVENARIA CONVENCIONAL
Authors: Amaral Tatiana Gondim do , Resende Fabiana Barbosa de , Camargo Filho Carlos Augusto Bouhid de
Published: August 2017

RESUMO: O Mapeamento de Fluxo de Valor (MFV) resgata a transparência dos processos à gerência de produção, possibilitando a eliminação das atividades que não agregam valor e otimiza a conversão. O artigo aplica o MFV ao processo de execução de alvenaria de vedação e identifica quais são as perdas e falhas no processo. A pesquisa realizada em uma empresa construtora goiana é classificada como estudo de caso, com abordagens qualitativas e quantitativas. Foram caracterizadas as atividades de fluxo e elaborou-se um MFV atual e futuro do processo produtivo de alvenaria convencional utilizando blocos de concreto sem função estrutural em um edifício residencial. Como resultado foi possível caracterizar as atividades e quantificar o impacto das atividades improdutivas e auxiliares do processo. Como principal contribuição foi possível identificar quais são as perdas e falhas no processo, propondo melhorias, a fim de reduzir a parcela de atividades improdutivas, otimizar as atividades auxiliares e aumentar a parcela das atividades produtivas. ABSTRACT: The Value Stream Mapping (VSM) rescues the transparency of processes to manage production, enabling the elimination of activities that do not add value and optimize conversion. This paper applies the MFV to seal masonry process and identifies what are the losses and failures in the process. The research carried out in construction company of the city of Goiânia is classified as a case study, with qualitative and quantitative approaches. The flow of activities were characterized and elaborated a MFV current and future production of conventional masonry process using non-structural concrete blocks in a residential building. As results, it was possible to characterize the activities and quantify the impact of unproductive activities and process aids. The main contribution was to identify the losses and failures in the process, proposing improvements in order to reduce the number of unproductive activities, optimize auxiliary activities and increase the share of productive activities.