bluuebunny/crossref_metadata_2025 huggingface dataset:
Wenn es in der Schulter klemmt – Impingement-Syndrom
Authors: Zander Andrea
Published: July 2019

Blockierende Bewegungseinschränkungen in der Schulter sind häufig Zeichen eines Impingement-Syndroms. Dabei kommt es zu schmerzhaften Weichteileinklemmungen. Die vielfältigen Ursachen des Syndroms machen eine genaue Befunderhebung und einen darauf abgestimmten Behandlungsplan notwendig.
Ein RTS-Prozess zur
Achillessehnentendinopathie
Authors: Metzger Thomas
Published: July 2019

Körperliche Aktivitäten und Bewegungen wie Laufen, Springen oder
Richtungswechsel, also solche mit einer hohen Aufprallbelastung, sind
prädisponierend für eine Achillessehnentendinopathie. Um die differenzierte
Rehabilitationsplanung in die Praxis umsetzen zu können, sind verschiedene
Voraussetzungen erforderlich. Welche Strategien möglich sind, beschreibt der
Autor in einem Fallbeispiel.
Aufwertung der Fallstudie für die physiotherapeutische
Praxis
Authors: Beenen Paul
Published: July 2019

Einen Patienten optimal zu behandeln ist ähnlich anspruchsvoll wie ein Kind zu
erziehen! Das behauptet zumindest Paul Beenen, der in seinem Beitrag die
Relevanz der Fallstudie untermauert und sich dafür einsetzt, ihr im Kontext der
physiotherapeutischen Forschung und Lehre mehr Beachtung zu schenken.
Diagnostic performance of endoscopic ultrasound-guided fine-needle aspiration for cystic and non-cystic pancreatic neuroendocrine tumors
Authors: Dhaliwal Amaninder Jeet Singh , Strosberg Jonathan R. , Centeno Barbara A. , Vignesh Shivakumar
Published: July 2019

Background and study aims Pancreatic neuroendocrine tumors (P-NENs) are rare tumors with malignant potential. Endoscopic ultrasound-guided fine-needle aspiration (EUS-FNA) has been shown to be superior to other imaging methods in preoperative localization and diagnosis of P-NENs. The objective of this study was to describe the EUS features of non-metastatic cystic and non-cystic P-NENs seen at a referral center and to evaluate the performance of EUS-FNA in diagnosis of P-NENs.

Patients and methods All patients with histologically confirmed, non-metastatic P-NENs, which underwent EUS-FNA prior to surgical resection at the Moffitt Cancer Center between Jan 2005 and Dec 2012 were included. Clinical, endoscopic and pathologic information was abstracted from electronic medical records.

Results Thirty-nine patients, all with non-functional P-NENs, were included in this study. Thirteen tumors were cystic and 26 were solid. Among the cystic tumors, 50 % were partly cystic and partly solid, and 50 % were fully cystic. The cystic tumors were more commonly seen at the body/tail, and the solid tumors were more uniformly distributed. Fluid could be aspirated from 50 % of the cystic tumors, all with a carcinoembryonic antigen level < 192 ng/mL. With surgical pathology as the gold standard, overall sensitivity of EUS-FNA in diagnosing cystic tumors was 62.5 %, and for solid tumors, 95 % (P < 0.03).

Conclusions EUS-FNA is much more sensitive in diagnosing solid P-NENs than cystic PNETs. Our results indicate that EUS-FNA may have higher sensitivity for diagnosis of cystic P-NENs than the reported sensitivity of EUS-FNA for all pancreatic cystic tumors.
First Experience with Fluorescence in Pediatric Laparoscopy
Authors: Fernández-Bautista Beatriz , Mata David Peláez , Parente Alberto , Pérez-Caballero Ramón , De Agustín Juan Carlos
Published: July 2019

Background The use of intraoperative fluorescence images with indocyanine green (ICG) has recently been described as an aid in decision-making during surgical procedures in adults.

We present our first experiences with different laparoscopic procedures performed in children using ICG fluorescence images.

Material and Method We have used ICG fluorescence imaging technique in varicocele ligation, two nephrectomies, cholecystectomy, and one case of aortocoronary fistula closure. All procedures were performed through a minimally invasive approach. A high definition camera equipped with a visible infrared light source and gray-scale vision technology was used.

After injection of ICG before or during the laparoscopic procedure, precise identification of vascular anatomy and bile duct architecture were easily identified. Fluorescence helped to assess blood flow from the spermatic vessels, define the variability of renal vascularization, and determine the precise location of the aortocoronary fistula. Biliary excretion of the ICG allowed the definition of the biliary tract.

Conclusion Fluorescein-assisted images allowed a clear definition of the anatomy and safe surgical maneuvers during surgical procedures. The ICG imaging system seems to be simple and safe. Larger and more specific studies are needed to confirm its applicability, expand its indications, and address its advantages and disadvantages.
Late Diagnosis of Complete Colonic and Rectal Duplication in a Girl with an Anorectal Malformation
Authors: AbouZeid Amr AbdelHamid , Mohammad Shaimaa Abdelsattar , Ibrahim Sherif Elhussiny , Fagelnor Anas , Zaki Ahmad
Published: July 2019

Complete colonic duplication is rare, and usually occurs as a part of the caudal duplication syndrome. In such cases, the diagnosis is clinically evident by the presence of two ani arranged side by side in the perineum, which is commonly associated with duplication of the external genitalia as well (double phallus or double vestibule). In this report, we present a special case of anorectal anomaly that was associated with complete tubular colonic duplication. The diagnosis was initially missed due to the uncommon sagittal arrangement of duplicated rectum: one rectum was ending externally into the perineum by rectoperineal fistula, while the other was hidden by its internal termination into the vagina. Our final diagnosis for this case was a variant of anorectal anomaly in the female, which was associated with complete colonic duplication. One colon (which was in the free mesenteric border) terminated anteriorly into the vagina as a part of a “short common channel” cloaca, while the other colon terminated by rectoperineal fistula. Although the anomaly seems to be rather complex and confusing, yet our case was associated with an excellent outcome due to the benign type of anorectal anomalies (rectoperineal fistula and “short common channel” cloaca) and absence of significant sacral dysplasia; in addition to adequate identification of the abnormal anatomy by appropriate investigations and the staged approach for surgical reconstruction.
Web-Based Bioinformatics Predictors: Recommendations to Assess Lysosomal Cholesterol Trafficking Diseases-Related Genes
Authors: López de Frutos Laura , Cebolla Jorge J. , Irún Pilar , Köhler Ralf , Giraldo Pilar
Published: July 2019

Introduction The growing number of genetic variants of unknown significance (VUS) and availability of several in silico prediction tools make the evaluation of potentially deleterious gene variants challenging.

Materials and Methods We evaluated several programs and software to determine the one that can predict the impact of genetic variants found in lysosomal storage disorders (LSDs) caused by defects in cholesterol trafficking best. We evaluated the sensitivity, specificity, accuracy, precision, and Matthew's correlation coefficient of the most common software.

Results Our findings showed that for exonic variants, only MutPred1 reached 100% accuracy and generated the best predictions (sensitivity and accuracy = 1.00), whereas intronic variants, SROOGLE or Human Splicing Finder (HSF) generated the best predictions (sensitivity = 1.00, and accuracy = 1.00).

Discussion Next-generation sequencing substantially increased the number of detected genetic variants, most of which were considered to be VUS, creating a need for accurate pathogenicity prediction. The focus of the present study is the importance of accurately predicting LSDs, with majority of previously unreported specific mutations.

Conclusion We found that the best prediction tool for the NPC1, NPC2, and LIPA variants was MutPred1 for exonic regions and HSF and SROOGLE for intronic regions and splice sites.
Translating Research into Agile Development (TRIAD): Development of Electronic Health Record Tools for Primary Care Settings
Authors: Clark K. D. , Woodson T. T. , Holden R. J. , Gunn R. , Cohen D. J.
Published: July 2019

Objectives This article describes a method for developing electronic health record (EHR) tools for use in primary care settings.

Methods The “Translating Research into Agile Development” (TRIAD) method relies on the close collaboration of researchers, end users, and development teams. This five-step method for designing a tailored EHR tool includes (1) assessment, observation, and documentation; (2) structured engagement for collaboration and iterative data collection; (3) data distillation; (4) developmental feedback from clinical team members on high-priority EHR needs and input on design prototypes and EHR functionality; and (5) agile scrum sprint cycles for prototype development.

Results The TRIAD method was used to modify an existing EHR for behavioral health clinicians (BHCs) embedded with primary care teams, called the BH e-Suite. The structured engagement processes stimulated discussions on how best to automate BHC screening tools and provide goal tracking functionality over time. Data distillation procedures rendered technical documents, with information on workflow steps, tasks, and associated challenges. In the developmental feedback phase, BHCs gave input on screening assessments, scoring needs, and other functionality to inform prototype feature development. Six 2-week sprint cycles were conducted to address three domains of prototype development: assessment and documentation needs, information retrieval, and monitoring and tracking. The BH e-Suite tool resulted with eight new EHR features to accommodate BHCs' needs.

Conclusion The TRIAD method can be used to develop EHR functionality to address the evolving needs of health professionals in primary care and other settings. The BH e-Suite was developed through TRIAD and was found to be acceptable, easy to use, and improved care delivery during pilot testing. The BH e-Suite was later adopted by OCHIN Inc., which provided the tool to its 640 community health centers. This suggests that the TRIAD method is a promising research and development approach.
Anterograde Amnesia as a Manifestation of Acute Type A Aortic Dissection
Authors: Stöllberger Claudia , Koller Julia , Finsterer Josef , Schauer Dominic , Ehrlich Marek
Published: July 2019

Objectives Memory impairment has been only rarely reported in association with acute aortic dissection type A. We report a patient with pure anterograde amnesia and memory impairment of contents occurring after the event, accompanying acute aortic dissection type A.

Case Report A previously healthy 53-year-old Caucasian male was admitted because of sudden chest pain after having lifted a heavy object. Clinical examination and electrocardiogram showed no abnormalities. Since blood tests showed leukocytosis, anemia, and elevated D-dimer level, either pulmonary embolism or aortic dissection was suspected; therefore, computed tomography was suggested. The patient seemed disoriented to time, and neurologic investigation confirmed that the patient was disoriented to time; short time memory was severely impaired and concentration was reduced. An amnestic episode with anterograde amnesia was diagnosed. Computed tomography showed type A aortic dissection. A supracoronary replacement of the ascending aorta was performed. The patient was discharged on the 7th postoperative day. Three months postoperatively, the patient is clinically stable; however, amnesia for the interval between pain onset and cardiac surgery persists.

Conclusions Transient amnesia, usually considered a benign syndrome, may be more common than generally recognized in aortic dissection. The suspicion for aortic dissection or other cardiovascular emergencies is substantiated when amnesia is associated with sudden onset of chest pain, leukocytosis, and elevated D-dimer levels. Computed tomography of the aorta with contrast medium is the imaging method of choice to confirm or exclude the diagnosis.
Arthroscopically Assisted Bone Grafting Reduces Union Time of Scaphoid Nonunions Compared to Percutaneous Screw Fixation Alone
Authors: Gvozdenovic Robert , Joergensen Rasmus Wejnold , Joerring Stig , Jensen Claus Hjort
Published: July 2019

Purpose Minimally invasive techniques have been recommended in the treatment of painful but stable scaphoid nonunions. The purpose of this study was to determine if arthroscopically assisted bone grafting provided superior results in healing as compared to percutaneous screw fixation.

Materials and Methods One hundred sixty-four consecutive patients with scaphoid nonunions were retrospectively analyzed. One hundred forty-eight patients were treated with the open grafting techniques either with iliac or distal radius bone, leaving 16 patients treated with minimally invasive surgery. In the group treated percutaneously (n = 8), the time from injury to surgery was 2.5 months (range: 2–4 months) and it was 27.3 months (range: 3–180 months) in the arthroscopic group (n = 8). The mean age was 39 years (range: 20–66) in the percutaneous group and 22 years (range: 16–32) in the arthroscopic group. In all cases, the Mini Acutrak headless fully threaded compression screw was used. Healing was assessed clinically and radiographically at a minimum follow-up of 12 weeks, mean 7 months (range: 3–12 months). Data were calculated with two-tailed Mann–Whitney U test based on p-value of < 0.05 that was considered statistically significant.

Results We recorded no complications in any of the groups. Patients treated arthroscopically received cancellous bone grafting from the distal radius and all patients but one healed at a median of 7.8 weeks (range: 5–18 weeks). Seven patients in the percutaneous group healed at a mean of 10.5 weeks (range: 7–24 weeks), thus leaving one patient from each group without achieving union. Mann–Whitney U test showed the U value of 11, the critical value of U to be 13 (p < 0.05), thus significantly faster healing was observed in the arthroscopically treated group.

Conclusions Arthroscopically treated patients achieved faster healing despite shorter time to surgery in the percutaneous group. Local bone grafting is considered as the main reason for this outcome. Younger population in the arthroscopically treated group may have influenced the result.

Level of Evidence This is a Level III comparative study.
Stochastic geometry sensing and polarization in a lipid kinase–phosphatase competitive reaction
Authors: Hansen Scott D. , Huang William Y. C. , Lee Young Kwang , Bieling Peter , Christensen Sune M. , Groves Jay T.
Published: July 2019

Significance

Spatial gradients of phosphatidylinositol phosphate (PIP) lipids in the cell membrane regulate a variety of cellular processes, including endocytosis, phagocytosis, and cell migration. The molecules that control these cellular processes must navigate a diverse range of geometric constraints, including membrane sheets, blebs, vesicles, and tubules. Stochastic geometry sensing provides a mechanism for controlling spatial patterning of molecules on cellular membranes, by exploiting differences in molecular copy number and kinetic asymmetries between opposing enzymatic reactions. The generality of the stochastic geometry-sensing mechanism suggests that such effects are likely to occur in cellular signaling systems.
Dialogical power negotiations in conflict mediation
Authors: Bijnen Emma van
Published: July 2019

In this study, mediator – party power dynamics in workplace disputes mediation dialogues are examined. Adopting
Gramsci’s concept of hegemony (e.g. 2005) and Foucault′s notion that power is not fixed
in dialogues, but constantly negotiated by participants (e.g. Foucault 1980), the
analyses show that the power dynamics shift in the mediation setting when mediators subordinate dominant parties and enforce their
own formalized power as procedural guides to design (Aakhus 2003, 2007) a favorable context for conflict resolution. When their procedural power is threatened, mediators
may use specific devices in their interventions that correlate with the four devices – interruption, enforcing explicitness, topic
control, and formulation – Fairclough (1989, 135–137) states can be used by dominant
participants to control weaker parties in dialogues.
Time tells a story
Authors: Abuarrah Sufyan
Published: July 2019

This study provides a synthesized perspective on the functions and ideological orientation of time adverbials as (re)situated in their socio-political contexts in five speeches by the Palestinian President Mahmoud Abbas at the UN. By analysing adverbials of truncated, extending, and fixed time references, the study reveals some systematic ideological formulations of conflict and resolution in the Palestinian political discourse. Adverbials of truncated and extending time are incongruous and generate a sense of interpretive dissonance. The truncated sense is embedded and more particular, thus counteracting the extending time which is established as more progressive, perseverant and consistent. This represents power asymmetries and different ideological orientations to conflict and resolution. Adverbials of fixed time, however, are transformative; they grant an end to a clash of ideologies due to the conflict between truncated and extending temporalities, and therefore resurrect a discourse that is based on equity and justice.
What makes a positive experience?
Authors: de la O Hernández-López María
Published: July 2019

‘Sharing economy’ platforms such as Airbnb have recently given rise to new travel trends in which electronic word of mouth and interpersonal contact are central. This study examines 90 positive reviews, with a threefold objective: first, analyse what makes Airbnb a social platform; second, understand online/offline rapport enhancement prior to and during the Airbnb experience; and third, examine the main rapport enhancement strategies in users’ evaluations. The results show that while reviewers place great importance on transactional wants before the experience, during face-to-face contact sociality rights become more important. After the Airbnb experience, however, the main rapport strategies point to enhancing the addressee’s face, while identity is constantly co-constructed. The present study intends to bring to the fore the function of positive rapport in the Airbnb experience, in an online system in which the management of communicative skills may be the main tool for success – or failure.
Bacteria with natural chemotaxis towards methanol revealed by chemotaxis fishing technique
Authors: Tola Yosef Hamba , Fujitani Yoshiko , Tani Akio
Published: July 2019

Motile bacteria often exhibit chemotaxis toward favorable compounds. However, the diversity of bacteria that are attracted to a given substance is largely unknown. This study aimed to reveal the diversity of bacteria with natural chemotaxis towards methanol. We tried to enrich environmental chemotactic bacteria using a glass capillary that is half-filled with methanol solidified with agarose as a trap (“chemotaxis fishing”). The pilot experiment using methanol-chemotactic Methylobacterium aquaticum strain 22A enriched the cells by 46-fold. The method was then applied to bacterial suspensions from paddy water and plants. Depending on the isolation sources and the methods of motility induction, methylotrophic bacteria were enriched 1.2–330-fold. The fished isolates belong to 32 species in 18 genera, mainly containing Acinetobacter, Methylobacterium and Pseudomonas species. Our chemotaxis fishing unveiled a part of diversity of the bacteria with natural chemotaxis towards methanol.
Design and Construction of Security Monitoring System for Optical Fibre Communications
Authors: Chyad Radhi M , Ali Alaa H , Khalef Nihaya H , Hamad Ahmed A , Mahmood Aseel I , Mahdi Bushra R , Rashid Wasfi H , Shaiee Noon K
Published: July 2019

Despite the fact that security monitoring system is high in communications using optical fibre, communications are still easy to be penetrated and information could be stolen. Companies have developed tools and equipment bugging and stealing data sent over optical fibre network, especially in those areas experiencing high loss of optical signal. Thus, it has become necessary to design and construct monitoring and warning system to avoid penetration or access to optical cable network. It is more convenient to install field application and control security system for optical cable communications that are parallel with the oil transportation pipeline. The project aims to sending a signal light with low-power ability and sensitivity by using Wavelengths Division Multiplexer (WDM), Dense Wavelengths Division Multiplexer (DWDM), and Optical Time Domain Reflect Meter (OTDR) as measurement and Optical Spectrum Analyser as a detector (OSA). The system is then used in monitoring oil and gas pipeline leakage or muggers and monitoring damage in the body of dams by adding fibre optics sensors. The sensors are to be distributed on the surface and connected with each other in the form of retinal rings to reach the receiving devices. It could also monitor ranges reaching to up about a hundred kilometres.
Graphene Effect on the Mechanical Properties of Poly (Ethylene Oxide)/ Graphene Oxide Nanocomposites Using Ultrasound Technique
Authors: Al-Bermany Ehssan , Qais Dhefaf , Al-Rubaye Shaymaa
Published: July 2019

Graphene is one of the most important materials that have attracted the attention of scientists and engineers because of its unique properties. Graphene oxide was used with different concentrations (0.5, 1, 1.5 and 2 wt%) that were mixed with high molecular weight polymer to prepare several models of PEO-GO nanocomposites using solution casting methods. Some of the properties of the samples, including the density, viscosity and ultrasonic velocity were measured using different technologies such as the ultrasound (US). The results showed a change and significant enhancements in these properties with the increase of graphene oxide concentrations in the matrix. Where, the viscosity increased up to 112.5 %, meanwhile the mechanical properties enhanced by 86.2 % and 719 % of ultrasonic velocity and bulk modules, respectively. Most of the mechanical properties were increased exponentially with the increase of GO concentrations. The results found that the best concentration of (GO) was (1.5 wt%) that greatly enhanced the mechanical properties in this study. SEM images presented a clear change in the fracture surface that showed a smooth surface and homogeneous dispersion of the GO nanosheets into the PEO matrix.
Structural and Optical Properties of Boron Doped Cadmium Oxide
Authors: Khadayeir Abdulhussain A , Hassan Ehssan S , Chiad Sami S , Habubi Nadir F , Abass Khalid H , Rahid Maher H , Mubarak Tahseen H , Dawod Mohamed O , Al-Baidhany Ismaeel A
Published: July 2019

Thin films of transparent and conductive CdO and B1,3)w% doped cadmium oxide (CdO: B) (1 and 3) wt %, have been deposited using chemical spray pyrolysis (CSP)) technique on glass substrate temperature of 300°C. Microstructural analysis indicates that X-ray diffraction study shows that the obtained films were polycrystalline. The preferred orientation was along the direction (200) and that the average crystallite size increases with the increasing B content. Morphological properties were studied, by scanning electron microscope (SEM) and atomic force microscopy (AFM) which reveals that the grains have a similar column shape. UV-visible transmission spectroscopy reveal that the prepared thin films are transparent in the visible range, The value of the optical band gap obtained shows a slight increase in its values from 2.43 eV to 2.45 eV as B concentration increasing.
Effect of the Geometric of (Al) Hollow Cathode on Paschen Curves in Nitrogen
Authors: Khadayeir Abdul hussain A. , Taher Wessam M.
Published: July 2019

In this paper, an experimental study of DC hollow cathode glow discharge plasma at different nitrogen pressures ranged from (0.065 to 0.75Torr) has been proposed. Investigated was carried out under the influence of the hollow cathode geometry such as diameter and depth of hollow cathode on the breakdown voltage of the nitrogen gas, the discharge system consists of two electrodes, the cathode forms various geometrical shapes and anode as a disc- shaped with diameter (8.8cm). The electrodes are enclosed in a large cylindrical glass chamber of pyrex filled with nitrogen gas. Three important physical parameters affecting the condition of the discharge are the gas pressure, constant inter-electrode distance and the cathode geometry. We used the hollow cathode with geometric shapes such as Cylindrical, conical, oppressive and variable dimensions. The cylindrical and conical shapes have inner diameters (3 & 6) cm and repressive shapes have inner diameter (1 & 2) cm. The breakdown voltage Vb is shown to depend on the product (p.d), for lower values of pressure, p or gap, d. This work represents the investigation of the dependence of the breakdown voltage on the gas pressure and on the distance between electrodes and the cathode geometry. The minimum value of breakdown voltage increases with increases gap d or increase the diameter of the hollow cathode with the length of the cavity is fixed.
An assessment of soil salinity and vegetation cover changes for a part of An-Najaf governorate using remote sensing data
Authors: Al-Khakani Ebtihal T , Yousif Sa’ad R
Published: July 2019

This paper deals with assessing and detecting the changes of soil salinity and vegetation cover for a part of An-Najaf Governorate and verification regarding the impression of soil salinity on the change of vegetative regions, over the period from 2001 to 2015. The results demonstrated a clear reduction in vegetative cover with salinity rates increased. The normalized difference vegetation index (NDVI) and Soil Salinity Index (SI) were applied for each date using the multispectral images derived from Landsat ETM+ and OLI data. Then image differencing technique was utilized to detect the change/no-change for vegetation and salinity for the two study periods. The results revealed that soil salinity increased from 6.36 in 2001-2009 period to 10.59% in 2009-2015, whereas the vegetation cover deteriorated to 9.95 % for the same period. Finally, the strong inverse correlation which found in this paper between NDVI and SI emphasizes that vegetation cover on long term is heavily and directly affected by changes of soil salinity.
Comparison of the methods of solid state reaction and sol-gel in the preparation of HgBa2Ca2Cu2.8Zn0.2O8+δ superconducting compound
Authors: Haider Haider MJ. , Jasim Kareem A.
Published: July 2019

This paper investigated the influence of the preparation method change on the superconductivity properties and crystal structure of HgBi2Ca2Cu2.8Zn0.2O8+δ. The crystal structure was examined by XRD for all prepared samples, it was found that consist of a major 1223 high -Tc phase. However, the electrical resistivity as a function of temperature was used to calculate critical temperature Tc, Tc (offset) = 121K,126K and Tc(onset)=124K, 131K for (SSR),(SG) respectively. While the samples dielectric properties which includes (Dielectric constant (real & imaginary), Loss tangent and Alternating electrical conductivity),were studies as a function of the frequency and range (50 Hz-1MHz) at room temperature.
A modified E-shaped microstrip patch antenna for dual band in x- and ku-bands applications
Authors: Godaymi Al-Tumah Wa’il A. , Shaaban Raed M. , Ahmed Zeki A.
Published: July 2019

In this paper, different shapes of an E-patch microstrip antenna designed and operating at x- and ku-bands by using High Frequency Structure Simulator (HFSS) software version 13. The finite element method used to solve electromagnetic values. The dielectric substrate material is Arlon AD320A (tm) with dielectric constant (εr = 3.2) and thickness h=1.79 mm used in this design. The new designs including modifying and slotting E-patch increased the gain of proposed antennas and provided a dual band frequency in x- and ku- bands. The return loss, voltage standing wave ratio (VSWR) and radiation patterns are evaluated.
Theoretical study of electronic properties for pristine and alloyed double metal rings
Authors: Merdas Samar M. , Al-Badry Lafy F. , Hanoon Falah H.
Published: July 2019

The present work is a theoretical study of the electronic properties of pristine and alloyed double metal rings threaded by magnetic flux in the presence of transverse flux. The system that takes into account in the study is consisting of two rings connected in parallel, with the same type of atomic sites for pristine double metal ring, and with two different types of atomic sites for an alloyed double metal ring. The tight-binding method was used to calculate the energy spectrum and persistent current in presence of transverse flux. Our results show that the transverse flux causes bending of the persistent current and increase in current amplitude at the pristine double metal ring, while it leads to asymmetry at alloyed double metal ring. The energy gap is not affected by the transverse flux.
Ternary Cu2SnS3 Thin Films Deposited by Fully Controlled System of Spray Pyrolysis
Authors: Hadi Zaid L. , Essa Mohammed Sh. , Chiad Bahaa T.
Published: July 2019

A fully computerized system of spray pyrolysis was employed for fabricating copper tin sulphite ternary thin film onto glass substrates. During deposition process, the glass substrate was maintained at 310 ± 10 °C. After dissolving the raw chemicals, a mixture of their aqueous solutions was used for spraying process. The optimum solution mixture at the volumetric ratio [S/(Cu+Sn)=1] at 1.5 of pH. XRD investigation was approved a monoclinic phase of CTS. A number of different platform speed was tested in the deposition process. XRD diffraction peaks were described at 2θ = 28.39°, 33.02°, 47.34°, and 56.39° corresponding to the

(

2
¯

1
¯

1
)

(

2
¯

0

6
)
,

(

2
¯

0

10
)
,

and

(

3
¯

2
¯

10
)

, respectively. These are crystal planes of monoclinic copper tin sulphide. The FTIR study certified a number of the chemical bond of Cu-, Sn- and S-. The grain size was observed in the range of nano using Scherrer formula. Studying surface morphology of CTS films reveals a uniform coating on the substrates which approved by SEM investigations.
Study optical properties of R6G dye doped in polymer PVA
Authors: Tahir K J , Obeed H H , Shiltagh N M
Published: July 2019

The linear and nonlinear optical properties for laser dye R6G is investigated in solvent methanol at different concentrations (5x10-4, 1x10-4, 1x10-5, 5x10-6 and 1x10-6 Ml) at thickness (2µm). The nonlinear optical properties as refractive index (n2
) and the nonlinear absorption coefficient (β) were studied by using Z-Scan technique in two parts; one part by putting aperture in front of the detector (close aperture) to find the nonlinear refractive index, however in second part is by removing the aperture (open aperture) to find nonlinear absorption coefficient, these by using two wavelengths 532, 1064 nm. The results show the effects of self – focusing in 532 nm and other concentrations in 1064 nm and the change of the saturation absorption effect in open aperture in both wavelengths. The higher nonlinear refractive index is found (n2
=29.93cm2/mw) in the concentration (1*10-4 Ml), while the higher nonlinear absorption coefficient is (β=8.88cm/mw) in the concentration (5*10-4Ml) at the wavelength 532 nm.
Construction of ZnO-Nanoflowers Photoanode for Photoelectrochemical Cell
Authors: Mebdir Holi Araa , Kadim Ayal Asmaa , Ali Baqer Anwar
Published: July 2019

ZnO-nanoflowers on a transparent conductive tin-doped In2O3 (ITO) glass substrate have been successfully prepared via a simple and efficient growth approach that is combining of dip coating and hydrothermal processes. One thin layer of ZnO nanoparticles is prepared by dip coating method followed by hydrothermally grown of ZnO nanoflowers at low temperature. The morphology and structure of ZnO-nanoflowers were inspected by field-emission scanning electron microscopy (FE-SEM) and X-ray diffraction (XRD), respectively. The optical absorption and photoluminescence spectra of ZnO-nanoflowers are also investigated. The ZnO-nanoflowers photoanode shows dramatically contributed to the separation of electron-hole pairs and enhanced the photoresponse. The photocurrent density is 0.44 mA/cm2 indicated that the PEC cells based on ZnO-nanoflowers photoanode have promising application potential in overall solar energy.
Electronic Properties in Single-Orbital Crystalline System Using Tight-Binding Approximation
Authors: Al-Galiby Qusiy H. , Shabeeb Dakhil Sarah
Published: July 2019

Using quantum theory (QT) combined with Tight-binding Approximation (TBA), we studied the electronic properties for single-orbital one dimensional, two-dimensional and diatomic crystalline chain to get simply qualitative understanding of electronic structure calculation in the periodic systems. Density of states (DOS) is one of the electrical properties that we try to understand within the band structures that lead to be able to know the mechanism of transport in the materials. The band structure and density of state (DOS) for both cases were calculated by using FORTRAN code. The calculation of DOS for ordered and disordered systems were performed via a numerical decimation method.
Effect of Black Cumin (Nigella sativa) Extracts in Inhibiting of the Mutagenic Activity of Mitomycin C in Albino Mice
Authors: Raheem Al-Aamiri Aseel
Published: July 2019

The aim of this study is to investigate the ability of black cumin (Nigella sativa) aqueous extracts in reducing the genotoxic effects induced by mitomycin C (MMC) in male mice Mus musculus (balb/c strain). Nigella sativa (N. sativa) has been widely used as a medicinal plant that treats different diseases. To determine the genotoxic effects of mitomycin C, the mitotic index of somatic and germ cells and chromosomal aberrations (chromatid breaks, chromosome breaks, and ring chromosomes) were tested. Twenty-five animals were divided into three main groups: group one was used as a negative control treated with buffer saline, group two was used as a positive control treated orally with mitomycin C (2 mg/kg b. w.) for two days; group three, which was divided into three sub groups, was treated orally with three different doses of N. sativa extracts (50, 100, 150 mg/kg b. w.) for one week, and then treated with mitomycin C for two days. The results of this study showed a protective role of N. sativa effecting a significant increase (P<0.05) of the frequency of mitotic index of both somatic and germ cells. Additionally, N. sativa may improve therapeutic efficiency of mitomycin C by inhibiting the chromosomal aberrations.
Assessment of some heavy metals contamination in sediments of Tigris River in Kut City, Wasit Governorate, Iraq
Authors: Obaid Maiws Al-Mayyahi Sattar , Ali Awad Al-Zamili Hussein
Published: July 2019

The grade of contamination in the Tigris River sediments in the Kut City by heavy metals Co, Cu, Cr, Mn, Ni, Pb, Zn and Cd has been evaluated by using some pollution indices like Enrichment factor (EF), geo-accumulation (I-geo), contamination factor (CF) and pollution load (PLI). The (EF, enrichment factor) is one of the most factors applied as a way to describe the degree of anthropogenic pollution to find enrichment ratios, where on the geo-accumulation has been mostly applied as a measurement of contamination in freshwater sediment. Whereas, the index of pollution load (PLI), appear the sum of times by which the heavy metals concentrations in the sediment exceed the level, concentration and accord a guide to the total level of heavy metals is toxicity in a special sample. By using these numerical sediments indices we found that the Sediments of Tigris River in the Kut city are polluted by the metals of Lead and Cadmium, and moderately polluted by the metals of Nickel, Zinc and Copper, while the sediments of Tigris River are not polluted by the metals of Manganese, Cobalt and Chromium.
Mechanical and Thermal Properties of Natural Rubber/Poly Lactic Acid /dioctadecyldimethylammonium bromide Modified Clay Nanocomposites
Authors: Hoidy W H , Al-Mulla E A J , Essa Sh M
Published: July 2019

This paper tackles a me1t blend of po1y(lactic acid)/ natura1 rubber with dioctadecyldimethylammonium bromide(DODAB) modified clay. The study investigated mechanical, therma1 and morpho1ogical properties of poly(lactic acid)/ natural rubber and nanocomposites. The paper also examined Montmori1lonite clay with alky1 ammonium ion of (DODAB). the studied parameters, PLA/ NR nanocomposites revealed 1arger enhancements in mechanical properties in comparison to PLA/ NR blend because of high polymer blend matrix shear forces exerted on clay aggregated during mixing po1ymer-clay. The original MMT with Na+ action leads to weak improvements in mechanica1 properties in comparison to organoclays. It is noted that the strength of tensile, modulus, and the nanocomposite samples can be improved with 4% of clay loading. The optimum samp1e morphology and chemical structure were tested by X-ray diffraction and FT-IR spectroscopy respectively. This paper denotes that poly(lactic acid)/ natural rubber-toughened nanocomposites with a higher modulus and in this way, thermal stability could be made.
Cloud point extraction of Cefixime drug by direct (UV- Vis) spectrophotometer and indirect(Flame Atomic Absorption) technique
Authors: Dhahir S A , Mohammed N J
Published: July 2019

A new method for the determination of the Cefixime drug in some Pharmaceuticals using ultra violet-visible (UV- Vis) and indirect Flame Atomic Absorption Spectrophotometry (FAAS) by Cloud point Extraction by using Triton X-114 as surfactant, the method based to form chelating complex CEF – Pd (II) at 456nm, variables parameters were studied such as the concentration of metal ion, effect of pH, Triton X-114 amount, equilibration temperature and incubation time. The best pH for the formation of chelating complex was (9). The best temperature on cloud-point extraction was 55 0C at 20 min. then complex extracted with ethanol. The mole-ratio method has been used to determine the structure of chelate CEF – Pd (II) and found to be 1:1 L:M (Ligand : Metal). Beer’s Law was obeyed in the range 2.5-30 and 2.5-32.5μg/mL for UVVis and FAAS respectively. Limit of Detection and Limit of Quantitation LOD and LOQ values for these methods were (0.456592, 0.33374) μg/mL (1.521976, 1.112471) μg/mL respectively.the method was validated and successfully applied to drug formulations like Cefix capsules marketed in Iraq. The results of analysis have been validated statistically and by recovery studies and were found satisfactory
On Smarandache Filter of a Smarandache BH-Algebra
Authors: Hadi Abbass Husein , Mohsin Luhaib Qasim
Published: July 2019

In this paper, The notion of a Smarandache filter of a Smarandache BH-Algebra is introduced, some theorems and examples are investigated and discussed to explain properties of this notion. A necessary and sufficient condition is derived for every Smarandache filter of a Smarandache BH-Algebra to become a filter. Finally, the relationships between this notion and Smarandache ideal are established
A Quantum Calculus Analogue of Dynamic Leontief Production Model with Linear Objective Function
Authors: Al-Salih Rasheed , Habeeb Ali , Laith Watheq
Published: July 2019

In this paper, we present a new formulation for the Leontief production model using quantum calculus analogue. This formulation unifies discrete and continuous Leontief production models. Also, the classical Leontief production model is obtained by choosing q = 1. In addition, briefly give an introduction to quantum calculus. We present the formulation for continuous Leontief production models as well as quantum calculus models. Moreover, we establish the weak duality theorem and the strong duality theorem for quantum calculus analogue. Furthermore, using the objective functions for the primal and the dual quantum calculus models, we can easily obtain upper and lower bounds for the value of production at any production plan. Finally, examples are provided in order to illustrate the given results.
Existence of Nonoscillatory Solutions of First Order Non-Linear Neutral Differential Equations
Authors: Mohamad H A , Sharba B A J
Published: July 2019

In this paper, some sufficient conditions have been obtained for the existence of positive solutions of the first order nonlinear neutral differential equations bounded by a ratio of bounded functions. For this purpose we used Krasnoselskii’s fixed point theorem and Lebesgue’s dominated convergence theorem to establish new sufficient conditions for the existence of nonoscillatory positive solutions. An example is included to illustrate the main result.
Numerical study of the flow structure in the supersonic inlet-isolator with mechanical throttle
Authors: Seleznev R K
Published: July 2019

In the paper three-dimensional model for hypersonic flow with turbulence model described. Comparing the result of calculation with wall pressure experimental data, obtained in the inlet-isolator model mounted to the floor of a Mach 5 wind tunnel at the University of Texas, presented in this article. A study is being conducted on the phenomenon of unstart of air inlet-isolator. The results of the distribution of pressure, the Mach number and the temperature inside the inlet-isolator at successive points in time presented.
Numerical simulation of a hypersonic flow over HB-2 model using UST3D programming code
Authors: Kryuchkova A S
Published: July 2019

Numerical modeling of a flow over HB-2 model using UST3D programming code was carried out. Aerodynamic coefficients dependencies from Mach number and angle of attack were compared to various experimental tests results. Good accordance of the numerical method predictions with empirical data was demonstrated. The numerical simulation has provided an extra UST3D code validation in application to aerodynamic calculations of hypersonic flows.
Visualization of the shock wave diffraction on the wedge in a rectangular channel
Authors: Znamenskaya I A , Ivanov I E , Naumov D S , Kulkin M K
Published: July 2019

The evolution of a shock wave interaction with a boundary layer on the surface of a shock tube channel after its reflection from a thin wedge is investigated. Visualization of the incident plane shock wave, the bow detached shock wave and flow behind the wedge in 48x24 mm channel was performed using the shadow method based on high-speed recording. The zone of boundary layer separation that occurs when the plane attached bow shock intersects with the channel wall is visualized on the basis of the pulse discharge glow recording. The flow evolution at incident shock wave Mach number of 2.3÷3.8 for the time interval up to 5 ms after the diffraction is investigated. The obtained data is compared with the corresponding CFD results: a numerical simulation based on the Euler equations of a nonstationary two-dimensional flow was performed under experimental conditions.
Experimental study of slow electrical explosion of thin titanium wires
Authors: Skryabin A S , Pavlov A V , Kartova A M , Telekh V D , Sytchev A E , Sachkova N V , Serov M M
Published: July 2019

The paper presents results of experimental studies of a slow (during 50÷100 μs) electric explosion of thin titanium wires in argon and air media. In that explosion wire destruction and its fragmentation are complex processes associated with thermo-mechanical stresses and electromagnetic forces. The explosion was characterized by oscillography and photography. Schlieren photos of the explosion allowed to visualize features of the wire dispersion. It was demonstrated that the nature of wire defragmentation was determined by a specific energy input QR
. At QR
≈1.2÷1. 5 J/mg wire fragmentation occurred with the formation of micron particles (with a diameter of 50÷150 μm). At QR
≈2.5÷2.8 J/mg forming of not only micron particles but also titanium nano powders due to electric arc ignition and extreme wire evaporation with the following non-equilibrium condensation. In the mode of high specific energy inputs generation of shock waves took place. The measured wave velocities reached of 700÷750 m/s. The manufactured titanium particles had purity of 96.65÷99.01 % as for raw wires.
The Radio-Frequency Capacitive Normal Glow Discharge in Axial Magnetic Field
Authors: Surzhikov S T
Published: July 2019

A numerical model of a normal axisymmetric high-frequency capacitive glow discharge in an axial magnetic field is considered. The analysis of previous investigations on α- and γ-forms of high-frequency discharges was performed. Using the author’s created numerical model, a study of the electrodynamic structure of a normal high-frequency axially symmetric glow discharge was performed with the following parameters: distance between electrodes of H = 2 cm, pressure of p = 5 Torr, amplitude voltage drop on the inter-electrode gap of E0 = 460 and 478 V, coefficient of the secondary ion-electron coefficient emissions of γ = 0.33. The two-dimensional electrodynamic structure of the γ-form of the high-frequency glow discharge was studied without and with an axial magnetic field induction of B

x
= 0.1 T. A qualitative explanation of the reasons for the radial expansion of the current channel of a high-frequency discharge in a normal mode is given.
Positioning of space objects by laser-induced jets
Authors: Loktionov E Y , Sitnikov D S
Published: July 2019

Laser-induced thrust provides a number of significant advantages over the currently used methods: virtually any material can be used as a working medium; radiation source and its power unit can be located outside the spacecraft; it is possible to provide a minimum impulse bit of 1 nN s or less; momentum imparted at single impact can be controlled within 2 orders of magnitude dynamic range. We have considered recoil momentum generation at femtosecond to continuous laser impact range on different materials normalized by laser output performance to evaluate momentum coupling to on-board energy system. It is shown that better momentum coupling at short wavelength is not worth of associated energy losses, but laser pulse shortening to picosecond range is. Data reported here on laser thrust generation efficiency and methods of laser impact layout are of interest not for small spacecraft application range broadening only, but also for the prevention of emergency situations development (launch to unplanned orbit, uncontrolled rotation, etc.), space debris removal, and anti-asteroid protection of the Earth – possible impact layouts for such missions are considered.
Effect of three-step mixing technology based on vibratory mixing on properties of high-strength concrete
Authors: Zhao Kaiyin , Zhao Lijun , Liu Shanshan , Hou Jinru
Published: July 2019

A large number of experimental studies have shown that both vibratory mixing and multi-step mixing processes can improve the workability of concrete and improve the strength and durability of high-strength concrete(HSC). In this paper, for C60 HSC, two kinds of mixin g methods: conventional compulsory mixing and vibratory mixing, two kinds of mixin g technology: one-step mixing technology and three-step mixing technology are used to carry out contrast test. The purpose is to study the influence of mixing meth od and mixing technology on the performance of HSC. The research results show that compared with the one-step mixin g technology, the three-step mixing technology can significantly reduce the plastic viscosity of the concrete, improve its fluidity, and significantly improve the compressive strength at the age of and after 28 days and 56 days under the condition of the conventional compulsory mixing and the vibratory mixing. And the study found that the most suitable mixing method and mixin g technology for C60 HSC are vibratory mixing method and three-step mixing technology.