bluuebunny/crossref_metadata_2025 huggingface dataset:
Implementation of Patient Safety Culture Survey in Jombang Islamic Hospital
Authors: Lathifah R , Ramadhan N A , Jibril Al Farabi M , Chalidyanto D
Published: April 2019

.
Prediction Model of Desire to Retreat on Nursing in Hospitals Based on Work Environment, Organizational Commitment, Work Satisfaction and Work Stress in Indonesia
Authors: . Rindu , Lukman S , . Hafizurrahman , Bachtiar A
Published: April 2019

.
METODE RGEC : PENILAIAN TINGKAT KESEHATAN BANK PADA PERUSAHAAN PERBANKAN SYARIAH
Authors: Wahasusmiah Rolia , Watie Khoiriyyah Rahma
Published: April 2019

Penelitian ini bertujuan untuk mengetahui tingkat kesehatan Bank Umum Syariah menggunakan metode pengukuran yang diatur dalam Peraturan Bank Indonesia PBI No.13 / 1 / PBI / 2011, tentang Penilaian Tingkat Kesehatan Bank dengan metode RGEC. Faktor penilaian dalam metode RGEC adalah faktor risk profile (risiko bank), faktor Good Coorporate Governance (GCG), faktor earnings (rentabilitas) dan faktor capital (permodalan). Objek penelitian ini adalah semua perusahaan perbankan syariah yang terdaftar di Bursa Efek Indonesia pada periode 2014 sampai 2016. Teknik pengambilan sampel dalam penelitian ini menggunakan purposive sampling. Teknik analisis dalam penelitian ini adalah deskriptif kuatitatif dengan menghitung rasio keuangan menggunakan  metode RGEC.Hasil penelitian ini menunjukkan bahwa bank yang memiliki tingkat kesehatan yang sehat dalam kategori sangat sehat untuk periode 2014 hingga 2016 adalah Bank Syariah Mandiri, BRI Syariah, BCA Syariah dan BNI Syariah, Bank Bukopin Syariah.
An Odd-Power Identity Involving Discrete Convolution
Authors: Petro Kolosov
Published: April 2019

Let be a power function $f_{r,M}(s)$ defined for every $s$ within the finite set $M$ as follows $$f_{r,M}(s)= \begin{cases} s^r, \ &s\in M,\\ 0, \ &\mathrm{otherwise}. \end{cases} $$ Let a discrete convolution of $f_{r,M}(s)$ be denoted as follows $\mathrm{Conv}_{r,M}[n]=(f_{r,M}*f_{r,M})[n]$. Let a real coefficients $A_{m,j}$ be given by the following recurrence $$ A_{m,j} = \begin{cases} 0, & \mathrm{if } \ j<0 \ \mathrm{or } \ j>m, \\ (2j+1)\binom{2j}{j} \sum_{d=2j+1}^{m} A_{m,d} \binom{d}{2j+1} \frac{(-1)^{d-1}}{d-j} B_{2d-2j}, & \mathrm{if } \ 0 \leq j < m, \\ (2j+1)\binom{2j}{j}, & \mathrm{if } \ j=m. \end{cases} $$ In this paper we show that for every $n>0$ the following odd-power identities involving coefficients $A_{m,j}$ and convolution transform $\mathrm{Conv}_{r,M}[n]$ hold $$ \begin{split} n^{2m+1}+1&=\sum_{r=0}^{m}A_{m,r}\mathrm{Conv}_{r,\mathbb{N}}[n],\\ n^{2m+1}-1&=\sum_{r=0}^{m}A_{m,r}\mathrm{Conv}_{r,\mathbb{Z}_{>0}}[n],\\ n^{2m+1}&=\sum_{r=0}^{m}A_{m,r}\sum_{k=1}^{n} k^r(n-k)^r\\ &=\sum_{r=0}^{m}A_{m,r}\sum_{k=0}^{n-1} k^r(n-k)^r. \end{split} $$
Effect of Niobium and Yttrium Modified Ti-Based Bulk Amorphous Alloy on Correlation of Plastic Deformation Energy and Ductility
Authors: Shan Shengfeng , Zhang Bing , Jia Yuanzhi , Ma Mingzhen
Published: April 2019

A series of Ti40Zr25Cu9Ni8Be18)100-xTMx (x = 0, 1, 2, 3, 4 at.%, TM = Nb, Y) Bulk amorphous alloys were designed and prepared using the copper mold casting method. The microstructures, glass forming ability and mechanical properties of the alloys were investigated by means of X-ray diffractometry (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), differential scanning colorimetry (DSC), depth-sensitive nanoindentation and uniaxial compressive test. The Bulk amorphous alloys with different ductility were investigated by measuring their plastic deformation energy (PDE) of the first pop-in events during loading. The relationships between the PDE value, shear band formation and ductility in Bulk amorphous alloys have been investigated. The results show that the PDE value decreases by the Nb addition and promotes the generation of multiple shear bands easily, which increase the fracture strength and plasticity significantly. Substituting Nb with Y has exactly the reverse effect. A useful rule for preparing of Bulk amorphous alloys with high plasticity is herein proposed, whereby the chemical composition of the Bulk amorphous alloys can be tailored to possess a lower PDE value.
Improved Reliability and Mechanical Performance of Sn58Bi Solder Alloys
Authors: Ren Guang , Collins Maurice N.
Published: April 2019

Abstract: Microstructural and mechanical properties of the eutectic Sn58Bi and micro-alloyed Sn57.6Bi0.4Ag solder alloys were compared. With the addition of Ag micro-alloy, the tensile strength was improved and this is attributed to a combination of microstructure refinement and an Ag3Sn precipitation hardening mechanism. However, ductility is slightly deteriorated due to the brittle nature of the Ag3Sn intermetallic compounds (IMCs). Additionally, a board level reliability study of Ag micro-alloyed Sn58Bi solder joints produced utilising a surface-mount technology (SMT) process, were assessed under accelerated temperature cycling (ATC) conditions. Results reveal that micro-alloyed Sn57.6Bi0.4Ag has a higher characteristic lifetime with a narrower failure distribution. This enhanced reliability corresponds with improved bulk mechanical properties. It is postulated that Ag3Sn IMCs are located at the Sn-Bi phase boundaries and suppress the solder microstructure from coarsening during the temperature cycling, hereby extending the time to failure.
Recycling of Waste Cooking Oils: Variation of the Chemical Composition during Water Treatment
Authors: Mannu Alberto , Ferro Monica , Colombo Dugoni Greta , Panzeri Walter , Petretto Giacomo Luigi , Urgeghe Paolo , Mele Andrea
Published: April 2019

Samples of sunflower Waste Cooking Oils (WCOs) subjected to several cycles of frying were treated with water under four different combinations of temperature and pH. The variation of the chemical composition of the oil samples was monitored through headspace Solid-Phase Microextraction (HS-SPME) coupled with gas-chromatographic technique (GC), 1H NMR spectroscopy and ESI+ mass spectrometry measurements. The possibility to modify the chemical composition of the recycled vegetable oil by tuning the water treatment parameters was exploited for the designing of a mini-plant for the production of bio-lubricants. A full description of the proposed prototype is also reported.
Hemiarthroplasty for Femoral Neck Fracture
Authors: Rodriguez-Buitrago Andres , Attum Basem , Cereijo Cesar , Yusi Kurt , Jahangir A. Alex , Obremskey William T.
Published: April 2019

Hemiarthroplasty is a common treatment for femoral neck fractures in the elderly population. The main complications are periprosthetic dislocation and infection, which potentially impact morbidity and quality of life and may contribute to mortality. This procedure can be technically demanding, and adequate closure of the capsule and soft tissue cannot be emphasized enough. One advantage of a bipolar prosthesis is that it can be easily converted to a total hip arthroplasty without replacing the femoral component and with approximately the same complication rates as a revision total hip arthroplasty. Cement should be used when the patient is osteoporotic or has a Dorr type-C canal because there is a significant reduction in risk of fracture. The addition of a collared stem is helpful if there is a crack in the calcar extending from the fracture. The procedure is as follows. (1) The patient is placed in the lateral decubitus position. (2) The surgical site is prepared and draped to above the iliac crest and mid-sacrum. (3) A posterior approach is utilized. (4) The hip is dislocated. (5) A cut is made at the femoral neck. (6) The implant is templated with the femoral head. (7) The femur is broached. (8) The trial implant is placed. (9) The femur is cemented. (10) Trial implants are removed and cement is placed. (11) The final stem implant is placed in 5° to 10° of anteversion. (12) The final head and neck implants are trialed and then placed. (13) Implant position and range of motion are tested. (14) The surgical wound is irrigated. (15) Short external rotators are repaired.

The posterior approach, which is often used, is known for increased rates of dislocation. The rate of dislocation can be minimized with repair of the posterior capsule and posterior soft tissue. Proper placement of the implants is of the utmost importance to minimize complications. Other contributing factors that lead to dislocation are implant malpositioning and patient factors.
Replantation of a Completely Amputated Thumb with Assistance of High-Speed Video Recording
Authors: Li Xingwei , Zhu Xiaozhong , Zhu Hongyi , Zhang Changqing , Chai Yimin , Zheng Xianyou
Published: April 2019

Background:

Generally, surgeons assess the quality of vascular anastomosis in digit replantation on the basis of their experience.

Description:

The steps for replantation of a completely amputated thumb, with assistance of high-speed video recording, consist of (1) debridement, (2) fixation, (3) tendon suture, (4) anastomosis, and (5) wound closure
1,2
.

Alternatives:

Revision amputation or flap coverage.

Rationale:

With the assistance of high-speed video recording, the refilling velocity ratio (RVR) is an objective index for the quality assessment of the vascular anastomosis.
FILTER SITUS KONTEN NEGATIF PADA PROXY SERVER MENGGUNAKAN LOGIKA FUZZY
Authors: Putra Arief Bramanto W. , Gaffar A.F. Onnilita , Salman Muhammad
Published: April 2019

berdampak pada pengguna dapat dengan bebas mengakses konten yang bersifat negatif. Proxy yang bertugas sebagai perantara antara client dengan server memiliki fungsi sebagai cache dan filter yang mampu berperan sebagai pembatasan akses konten negatif sehingga terciptanya penggunaan internet secara sehat. Diawali dengan melakukan percobaan komunikasi antara server dan client dengan menggunakan socket programming, kemudian memperoleh data berupa alamat dari sebuah situs dengan menggunakan metode Term Frequency menghasilkan 100 data situs yang terindikasi memiliki konten negatif yang selanjutnya disebut data log.

Pada proses ini diperoleh 8 prase yang mengandung konten dewasa, frekuensi kemunculan terkecil sejumlah 4 kali dan frekuensi kemunculan terbesar sejumlah 23 kali, dengan total keseluruhan frekuensi sejumlah 105 prase. Proses pengujian menggunakan 20 data alamat situs yang memiliki variasi prase yang selanjutnya dengan menggunakan logika fuzzy untuk melakukan metode Invers Document Frequency dapat diperoleh hasil situs yang berada didalam kategori tidak negatif sejumlah 13 situs dan terindikasi memiliki konten negatif sejumlah 7 situs
PERAMALAN KUNJUNGAN WISATAWAN DI OBYEK WISATA BEDUGUL MENGGUNAKAN ALGORITMA FUZZY TIME SERIES
Authors: Purnama I Nyoman , Ardyanti Anak Agung Ayu Putri
Published: April 2019

Bali merupakan salah satu primadona wisata di Indonesia. Hal ini disebabkan Bali memiliki budaya, adat istiadat dan kesenian yang beraneka ragam. Tabanan merupakan salah satu kabupaten di Bali yang memiliki ikon daya Tarik wisata yang cukup menarik. Kabupaten Tabanan sering disebut miniaturnya Bali. Karena karakter provinsi Bali secara umum terdapat di Tabanan. Adapun beberapa daya Tarik wisata yang ada di kabupaten Tabanan yakni Danau Beratan, Bedugul, Jatiluwih, Batukaru dan Bedugul. Bedugul merupakan salah satu ikon pariwisata yang banyak dikunjungi oleh wisatawan domestik Kunjungan wisatawan domestik ke obyek wisata Bedugul mengalami jumlah kunjungan yang tidak menentu setiap tahunnya.

Pada penelitian ini dikembangkan sistem peramalan kunjungan wisatawan menggunakan Fuzzy time series Ruey Chyn Tsaur. Data kunjungan ke objek wisata Bedugul akan dikumpulkan dari Badan Pusat Statistik dari tahun 2003- 2014. Fuzzy Time series merupakan konsep baru yang dikenal dengan istilah kecerdasan buatan yang digunakan untuk meramalkan masalah dimana data historis tersebut dibentuk dalam nilai-nilai linguistik dan menghasilkan peramalan yang lebih akurat. Dari hasil penelitian didapatkan nilai AFER sebersar 1.33 persen.
Marking frequency during intraspecific socialization sessions is related to urinary cortisol levels in shelter dogs
Authors: Alberghina Daniela , Pumilia Gina , Raffo Pierluigi , Distefano Giuseppe , Piccione Giuseppe , Panzera Michele
Published: April 2019

The aim of this study was to determine whether behavioural indicators such as marking frequency and whether cortisol/creatinine ratio (C/Cr) are influenced by three socialization sessions.  Six adult shelter dogs were selected: Group 1 (n.3) with adequate social experience and Group 2 with behavioural problems of aggression against humans (n.2) and excessive fear response towards conspecifics (n.1). Spontaneous urine samples were collected for C/Cr after socialization sessions. C/Cr was positively correlated with urinary marking frequency (P<0.01) and negatively with faecal marking frequency (P<0.05). The correlation with urinary marking could be related to increased release of aldosterone under ACTH stimulus or to chemical information that dogs are in a stressful situation. The negative correlation with frequency of faecal marking could be related to inhibition of act in a novel situation as stress effect. Non-invasive monitoring for detection of cortisol could be useful to assess canine behaviour modulation following intraspecific socialization sessions.
Exclusive Breastfeeding Rates and Factors Associated with Exclusive Breastfeeding Practices in Northern Tanzania: Measurement using Two Different Methodologies—24 Hours Recall and Recall Since Birth
Authors: Hussein Tamara H. , Mgongo Melina , Katanga Johnson , Uriyo Jacqueline G. , Damian Damian J. , Stray-Pedersen Babill , Msuya Sia E. , Wandel Margareta
Published: April 2019

Background: Exclusive breastfeeding (EBF) has many benefits to the child from mental to physical growth and development; however, methods of measuring EBF have raised a number of policy and programmatic questions. This study assesses EBF rates and factors associated with EBF practices in Northern Tanzania using two different methodologies, namely, the 24-hours recall and recall-since-birth.

Methods: 

A cohort study was conducted from October 2013 to December 2015 among mother-infants’ pairs. Mothers with child delivery information (N=430) were followed and included in the analyses. We enrolled pregnant women who were in their third trimesters and interviewed them with the help of questionnaires at enrollment, delivery, 7 days and thereafter monthly up to nine months after delivery. At each visit after delivery, information on breastfeeding using the two methods (24 hours recall and recall-since-birth) was collected.

Results: The prevalence of EBF dropped from one month to six months when using both the 24 hours recall and the recall since birth methods, but at different rates.At six months, 24.2% of the mothers practiced EBF when measured with the recall since birth method, compared to 38.8% when measured with the 24 hour recall. Predictors of EBF were also different.When using the recall since birth method, women who had received counseling on infant feeding had increased odds of practicing EBF compared to those who did not receive counseling, [AOR=2.3; 95% CI (1.2, 3.7)]. When using 24 hours recall, women who were unemployed had increased odds of practicing EBF compared to those who were employed [AOR=1.5;95% CI(1.1,2.5)], and women aged 35 - 49 years had decreased odds of practicing EBF compared to younger women [AOR=0.28; 95% CI(0.1,0.7)].

Conclusions and Global Health Implications: The two methods for EBF give substantially different results, both in the prevalence of EBF and factors associated with EBF. The higher EBF obtained with 24 hours recall represents an overestimation and thereby an overly positive picture of the situation.

Key words: • Breastfeeding • Exclusive Breastfeeding • Factors • Rates • 24 Hours • Recall Since Birth • Tanzania

 

Copyright © 2019 Hussein et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
In situ natural radioactivity and radiological hazard assessments of granite gneiss outcrops in parts of the Southwestern Basement Complex of Nigeria
Authors: AKİNGBOYE Adedibu Sunny , ADEMİLA Omowumi
Published: April 2019

Radioactive
emission (gamma ray) emanating from rock materials constitutes threats to humans
and their environment. Hence, the natural radioactivity and radiological hazard
indices of some granite gneiss outcrops
with their residual soils from two different localities within the Southwestern
Basement Complex of Nigeria were assessed using Gamma-ray spectrometry. The
study aimed at determining the natural radiation levels of granite gneissic
rocks and associated radiological threats to people living in the study area
from gamma ray exposure. Data were collected along six geophysical traverses of
200 m each with station spacing of 5 m using the portable hand-held Gamma-ray
Spectrometer. The results of weighted mean values of the elemental and activity
concentrations for 40K, 238U, and 232Th are
2.00 ± 1.43%, 3.13 ± 0.90 ppm, 12.32 ± 4.99 ppm and 629.28 ± 447.29, 38.58 ±
11.02, 49.96 ± 20.23

 respectively. The obtained mean concentration
ratios of 1.32 for U/Th and 2.14 for Th/U were higher than 0.26 and lower than
3.5 global standard ratios respectively. The increase in activity
concentrations and concentration ratio may have suggested the enrichment of
radioactive minerals in the granite gneissic rocks. The annual outdoor and
indoor effective doses of gamma ray exposure for people living in the study
area were below the world permissible standard of 1

,
thus, the area is radiologically safe.
However, increase in
estimated mean of AGDE and ELCR; 525.620

 and 1.273

 above the world permissible standards of 300

 and

 respectively
does not translate to significant radiological threats. Therefore, control
measure by constant monitoring of the radioactivity levels of the area and
rocks should be practiced.
Influence of Stalk Residue Retention and Fertilization on the Rhizospheric Effect with Drip‐Irrigated Cotton
Authors: Zhang Guojuan , Zhang Wangfeng , Pu Xiaozhen , Zhang Pengpeng , Ou Yanglong
Published: April 2019

Core Ideas

Stalk residue retention and fertilizer increased organic carbon, total nitrogen, and microbial biomass carbon.

Nitrogen‐phosphorus‐potassium plus poultry manure had the highest NO3–‐N and available nitrogen contents.

Stalk residue retention plus fertilization had positive rhizospheric effect on soil organic carbon and NO3–‐N.

Stalk residue retention plus fertilization had negative rhizospheric effect on total nitrogen and NH4+‐N.

Stalk residue retention plus fertilization had no net rhizospheric effect on pH and microbial biomass carbon.

By using less chemical fertilizer to produce cotton (Gossypium hirsutum L.), farmers could reduce input costs, increase efficiency, and protect the environment. The objective of this study was to determine the effects of stalk residue management and fertilizer application on the rhizospheric and bulk soil properties. The split‐plot design included two main plot treatments (stalk residue removal and stalk residue retention) and four subplot fertilizer treatments (no fertilizer; N, P, and K fertilizer; poultry manure; and NPK plus poultry manure). Results showed that stalk residue retention increased soil pH, whereas fertilization reduced it. Stalk residue retention and fertilizer application both increased organic C, total N, and microbial biomass C. The NPK plus poultry manure treatment had the highest nitrate (NO3–‐N) and available N contents. Stalk residue retention had negative rhizospheric effect on soil pH, total N, and ammonium (NH4+‐N) but positive rhizospheric effect on soil organic C, microbial biomass C, and NO3–‐N. The NPK plus poultry manure treatment had positive rhizospheric effect on soil pH, organic C, and NO3–‐N but negative rhizospheric effect on total soil N, microbial biomass C and NH4+‐N. Overall, stalk residue retention plus fertilization had positive rhizospheric effect on soil organic C and NO3–‐N, negative rhizospheric effect on total N and NH4+‐N, and no net rhizospheric effect on soil pH and microbial biomass C. Stalk residue retention improved soil quality and increased soil organic C and available N. Stalk residue retention plus NPK fertilizer and poultry manure can significantly increase soil organic C and active C components, thus ensuring high productivity.
Analysis and Modeling of Processes Involved with Salt Tolerance and Rice
Authors: Tartarini Sofia , Paleari Livia , Movedi Ermes , Sacchi Gian Attilio , Nocito Fabio Francesco , Confalonieri Roberto
Published: April 2019

Salinity is a worldwide problem for rice (Oryza sativa L.) cultivation, and a number of breeding programs targeting increased salt tolerance are ongoing. A new trait‐based mathematical model for salt stress on rice was recently proposed, characterized by a high level of detail in the description of physiological mechanisms dealing with crop response to salinity. In this study, dedicated growth chamber experiments were performed where three rice cultivars with different degrees of tolerance were grown under different salinity levels. The aim was to improve the understanding of physiological mechanisms like Na+ uptake and sequestration in structural tissues, and to validate the model using new datasets where temporal dynamics in plant response to salt stress were analyzed. Model evaluation demonstrated strong agreement between measured and simulated dry weights of plant organs (e.g., R2 = 0.88–0.97 for aboveground biomass), [Na+] in plant tissues (R2 = 0.73–0.88), and green leaf area index (R2 = 0.71–0.99). These results demonstrate the reliability of the model and support its adoption within studies aimed at analyzing or predicting the response of different cultivars to temporal dynamics of Na+ concentration in soil and water.
Determination of the oxidation state of iron in Mid-Ocean Ridge basalt glasses by Raman spectroscopy
Authors: Le Losq Charles , Berry Andrew J. , Kendrick Mark A. , Neuville Daniel R. , O'Neill Hugh St. C.
Published: April 2019

A series of synthetic Mid-Ocean Ridge Basalt (MORB) glasses with Fe3+/FeTOT from 0 to 1, determined previously by Mössbauer spectroscopy, were used to test methods for quantifying Fe3+/FeTOT by Raman spectroscopy. Six numerical data reduction methods were investigated, based on conventional approaches as well as supervised and unsupervised machine learning algorithms. For the set of MORB glass standards, with fixed composition, the precision of all methods was ≤±0.04 (1 St.dev.). However, Raman spectra recorded for 42 natural MORB glasses from a wide range of locations revealed a strong correlation between the spectra and composition, despite the latter varying only over a relatively limited range, such that the methods calibrated using the glass standards are not directly applicable to the natural samples. This compositional effect can be corrected by using a compositional term that links spectral variations to the Fe3+/FeTOT value of the glass. The resulting average Fe3+/FeTOT determined by Raman spectroscopy was 0.090 ± 0.067 (n = 42). This value agrees with the latest Fe K-edge XANES and wet-chemistry estimates of 0.10 ± 0.02. The larger uncertainty of the Raman determination reflects the sensitivity of Raman spectroscopy to small changes in the glass structure. While this sensitivity is detrimental for high precision Fe3+/FeTOT determinations, it allows the major element composition of natural MORB glasses to be determined within 1 mol% through the use of an artificial neural network. This suggests that Raman spectrometers may be used to determine the composition of samples in situ at difficult to access locations that are incompatible with X-ray spectrometry (e.g., mid-ocean ridges).
Landing of descent objects with a closed spherical pneumatic shock absorber
Authors: Komarov S.S. , Miskaktin N.I. , Tsvileneva N.Yu.
Published: April 2019

The landing of the landing object with a closed pneumatic shock absorber is considered. A mathematical model of planting the ”object–pneumatic shock absorber“ system is being constructed. Nonlinear boundary conditions in the sealing of the pneumatic shock absorber on the body of the landing object and in the area of interaction with the screen in the power structures in the ”object–pneumatic shock absorber“ movement system.
Pressure waves in a liquid containing bubble zone of finite dimensions
Authors: Galimzyanov M.N. , Shagapov V.Sh.
Published: April 2019

Some features of the dynamics of nonlinear two-dimensional pressure waves in a liquid containing bubble zone of finite dimensions and various shapes are studied. The results of numerical experiments on the action of wave pulses on a solid wall are presented, in the cases of the absence and presence of a bubble zone on the surface under consideration.

Based on the results obtained, a number of dependences of the dynamics of two-dimensional disturbances on the parameters of the signal and the medium are revealed.
Formation and propagation of waves during cavitation
Authors: Zakirov K.R.
Published: April 2019

The paper explores the collapse of a vapor bubble in a compressible fluid, accompanied by radiation from a divergent wave. The compressibility of a fluid is modeled using an isentropic equation of state of theta. The formation of a perturbation In the neighborhood of a bubble upon collapse, and then its propagation in surrounding the liquid upon re-expansion of the bubble. Divergent The wave is fairly accurately recorded in laser experiments breakdown of liquid, using sensors installed at some distance from the bubble. As for the formation of disturbances, in the literature there is a self-similar solution obtained for a liquid with equation Theta's state, which describes the final stage of the collapse. Based on this self-similar solution, a numerical scheme. After that, the numerical solution of the diverging wave is compared with available experimental data. Received good agreement with experiment.
The influence of the Stokes and Archimedes forces on the stability of a two-phase flow
Authors: Khudjuyerov B.H. , Chuliev I.A.
Published: April 2019

The problem of the stability of a two-phase flow is considered. The solution of the stability equations is performed by the spectral method using polynomials of Chebyshev. A decrease in the stability region gas flow with the addition of particles of the solid phase. The analysis influence on the stability characteristic of Stokes and Archimedes forces.
Mathematical model and some nonlinear effects of heat and mass transfer in multiphase media under action of high-frequency electromagnetic radiation
Authors: Kislitsin A.A.
Published: April 2019

The application of high-frequency electromagnetic radiation is one of the promisingmethods inoilandgas technologies,that canbewell usefor struggleagainst pitch, paraffin or gas-hydrate fall-out in wells and in pipelines, for action on reservoir and for other purposes. During in the operation of wells on their surfaces the asphalt-pitch-paraffinfall-out areoccurs causedof lowingof temperatureandpressure. These fall-out fills the space between pipes, that bring to a stop of well sometimes. The high-frequency electromagnetic heating is convenient mean (and the only possible way in some cases) to eliminate these complications. By that the experiments and the numerical simulation shows, that some nonlinear effects are possible. These effects are caused due to some media have temperature dependence of absorption coefficient. This dependence can be have more or less expressed “resonance“ view, to say have maximum by certain temperature. The position, height and width of that ”resonance“ dependences of electromagnetic radiation frequency and of dielectric properties of medium. These nonlinear properties can be used to rise of heating efficiency. If the radiation frequency is correct, one can to realize the heating in a ”temperature wave“ regime, that essentially rises the velocity of heating. And what is more, if one will use the nonlinear dependences α(T), one can to realize a ”reverse temperature wave“, that will move backwards: from far end of tube to the source of radiation, i.e. one can receive effects, those are impossible by usual conditions. Inthispaperthe temperaturedependence of absorption coefficient is investigated and the mathematical modelling of high-frequency electromagnetic heating (with due regard for this dependence) is carried out.
Extracellular Vesicles: A New Nano Tool for the Treatment of Inflammatory Bowel Diseases
Authors: Tandra Nitin , Wu Peipei , Hu Xinyuan , Mao Fei , Xu Wenrong , Qian Hui
Published: April 2019

The intestinal tract is a complex and important physiological and immunological organ. Intestinal tract homeostasis requires a series of coordinated interactions involving gut microbiota, the crypt intestinal stem cells (ISC) and the surrounding niche, including the intestinal epithelial cells, endothelial cells, dendritic cells, and macrophages. The destruction of intestinal homeostasis leads to autoimmune diseases, such as inflammatory bowel disease (IBD). IBD is a non-specific, and remittent- relapsing inflammatory disorder of the gastrointestinal tract. There is no effective method to keep patients in remission for a long term. It has been reported that extracellular vesicles (EVs) exert immune activation and immunosuppressive effects in the pathogenesis of IBD. In order to explore new therapeutic strategies for IBD, in this review, we summarize the observations on the immune properties and functions of EVs in intestinal mucosal immunity.
Human Adipose-Derived Stem Cells with Great Therapeutic Potential
Authors: Sheykhhasan Mohsen , Wong Joanna K.L. , Seifalian Alexander M.
Published: April 2019

:

The potential use of stem cell-based therapies for the repair and regeneration of various
tissues and organs offers a paradigm shift in regenerative medicine. The use of either embryonic stem
cells (ESC) or induced pluripotent stem cells (iPSC) in clinical situations is limited because of regulations
and ethical considerations even though these cells are theoretically highly beneficial. While clinically,
adipose-derived stem cells (ADSCs) are one of the most widely used types of stem cells used
more than five years in clinically setting. It has many advantages including; yields a high number of
ADSCs per volume of tissue, high rate of proliferation, anti-fibrotic, anti-apoptotic, anti-inflammation,
immunomodulation, and paracrine mechanisms have been demonstrated in various preclinical studies.
It is much easier to harvest compared with bone marrow stem cells. Results of clinical studies have
demonstrated the potentials of ADSCs for stem cells therapy for a number of clinical disorders. The
aim of this paper was to provide an update on the most recent developments of ADSCs, by highlighting
the properties and features of ADSCs, critically discussing its clinical benefit and its clinical trials in
treatment and regeneration. This is a multi-billion dollars industry with huge interest to clinician, academia
and industries.
An Approach to Treatment of Liver Cancer by Novel Glycyrrhizin Derivative
Authors: El-Senduny Fardous F. , Zidane Mahmoud M. , Youssef Magdy M. , Badria Farid A.
Published: April 2019

Background:

Liver cancer is a life threating disease as it is the fifth most common cancer and the
third most common cause of death worldwide with no safe, efficient, and economic drug available for treatment.

Methods:

This study intended to investigate glycyrrhizin and its derivatives for possible use as a cytotoxic agent
and as a drug for liver cancer treatment. Thus, after treatment of liver cancer cell line HepG-2 with 50 μM of
each compound, cell viability was determined.

Results:

The cytotoxicity assay showed glycyrrhizin derivatives ME-GA (18β-Glycyrrhetinic-30-methyl ester)
and AKBA (3-acetyl-11- keto-β-Boswellic acid) to be the most potent drug against liver cancer cell line HepG-2
with IC50 values 25.50 ± 1.06 and 19.73 ± 0.89 μM, respectively. Both the compounds showed higher selectivity
towards hepatocellular carcinoma rather than the normal lung fibroblast cell line WI-38. The presence of
methyl ester at C-30 greatly increased the cytotoxicity of ME-GA which might be attributed to its higher activity
and selectivity. Both ME-GA and AKBA contributed to inhibit cancer cell migration in the wound healing
assay and impeded colony formation. The use of flow cytometry to carry out cell cycle analysis and the determination
of possible mechanisms of action for apoptosis revealed that ME-GA arrested the cell cycle at G2/M
that led to the inhibition of hepatocellular carcinoma and induced apoptosis via the extrinsic pathway and its
ability to increase p53 transactivation.

Conclusion:

This work highlights the cytotoxicity of glycyrrhizin and its derivatives for possible use as a chemotherapeutic
agent against hepatocellular carcinoma cells HepG-2. The most cytotoxic compound was ME-GA
(18β-Glycyrrhetinic-30-methyl ester) with no cytotoxic effect on the normal cell line. In summary, this new
derivative may be used as an alternative or complementary medicine for liver cancer.
Linear Analysis of Stability of Pitched Roof Frames
Authors: Bocovo T. Mariano , Aisse Gerard Gbaguidi , Degan Gerard
Published: April 2019

Background:

In this paper, geometric nonlinear analysis of pitched roof frames was carried out by the stiffness matrix method using stability functions.

Objective:

This study contributes to a better knowledge of the stability of pitched roof frames, not braced, and therefore of the efficiency in their dimensioning.

Method:

At first, the argument of the stability functions was set as 0.01. The stiffness matrix of the frame has been assembled, as well as the nodal load vector of the frame. The boundary conditions (support restraint and wind bracing restraint) were introduced for the reduction of this matrix and the nodal load vector. At this stage, the determinant of the reduced stiffness matrix and the reduced nodal displacement vector are calculated. The argument of the stability functions is incremented by 0.01 and the operations are repeated until the determinant of the reduced stiffness matrix changes sign. The argument of the iteration preceding the sign change of the determinant and corresponding to its positive value is taken and refined by a process described in the paper. The buckling loads of the frame members are determined at this stage.

Results and Conclusion:

The analysis focused on four frames; the obtained results show that the increase in the inclination of the crossbar makes it possible to take full advantage of the “arch effect”. Arch effect is due to the presence of crossbars which have a linear arch shape. Furthermore, the angle as well as the length ratio, between the crossbar and post, influence critical load value.
Effect of Magnesium Addition on Corrosion Resistance of Aluminum -17%Silicon Alloy
Authors: Abbass Muna Khethier , Hassan Khairia Salman , Ameen Kayser Aziz
Published: April 2019

The electrochemical behavior of Al-17%Si alloy is investigated in 3.5wt% NaCl solution. Many alloys with addition of the different wt% magnesium metal of  1wt%, 2%, 3wt% ,4.5wt% ,and 9wt% were prepared by gravity die casting . The microstructures of prepared alloys were examined by optical and SEM microscopes. Corrosion behavior was investigated by using potentiostat instrument under static potentials test and corrosion current was recorded to determine corrosion resistance of all prepared samples. It was found that the addition of Mg metal improves the corrosion resistance of Al-17%Si alloy in 3.5%NaCl solution. The alloy containing 1%Mg shows less corrosion rate than the others while the alloys containing 4.5%Mg, 9%Mg content have the better pitting corrosion resistance than other alloys.
Fabrication and Characterization of Tri Metal Oxides by Chemical Spray Pyrolysis Technique as a Gas Sensor
Authors: Othman Farhad M. , Abdul-hamead Alaa A. , Ali Noor M.
Published: April 2019

In this research tri metal oxides were fabricated by simple chemical spray pyrolysis technique from (Sn(NO3)2.20 H2O, Zn(NO3)2.6 H2O, Cd(NO3)2.4 H2O) salts at concentration 0.1M with mixing weight ratio 50:50 were fabricated on silicon substrate n-type (111). (with & without the presence of grooves by the following diemensions (20μm width, 7.5μm depth) with thickness was about ( 0.1 ±0.05 µm) using water soluble as precursors at a substrate temperature 550 ºC±5, with spray distance (15 cm) and their gas sensing properties toward H2S gas at different concentrations (10,50,100,500 ppmv) in air were investigated at room temperature which related with the petroleum industry. Furthermore structural and morphology properties were inspecting. Experimental results show that the Zn2SnO4 and Cd2SnO4 thin films were achieved from the used salts and samples gas sensitivity which improved with the presence of substrate grooves. Which make the sensor suitable for the detection of lower .concentrations of hazard H2S gas in the petroleum industry.
Prediction of Surface Roughness and Material Removal Rate in Electrochemical Machining Using Taguchi Method
Authors: Ibrahim Abbas Fadhil
Published: April 2019

Electrochemical machining is one of the widely used non-conventional machining processes to machine complex and difficult shapes for electrically conducting materials, such as super alloys, Ti-alloys, alloy steel, tool steel and stainless steel.  Use of optimal ECM process conditions can significantly reduce the ECM operating, tooling, and maintenance cost and can produce components with higher accuracy. This paper studies the effect of process parameters on surface roughness (Ra) and material removal rate (MRR), and the optimization of process conditions in ECM. Experiments were conducted based on Taguchi’s L9 orthogonal array (OA) with three process parameters viz. current, electrolyte concentration, and inter-electrode gap. Signal-to-noise (S/N), the analysis of variance (ANOVA) was employed to find the optimal levels and to analyze the effect of electrochemical machining parameters on Ra and MRR. The surface roughness of the workpiece was decreased with the increase in current values and electrolyte concentration while causing an increase in material removal rate. The ability of the independent values to predict the dependent values (R2) were 87.5% and 96.3% for mean surface roughness and material removal rate, respectively.
Design and Implementation for 3-DoF SCARA Robot based PLC
Authors: Karem Iman Salih , A.Wahabt Talal A. Jabbar , Yahyh Mawadah Jlaa
Published: April 2019

Abstract 

This paper presents mechanical and electrical design, and implementation  process of industrial robot, 3-DoF type SCARA (selective compliment assembly robot arm),with two rotations and one translation used for welding applications.The design process also included the controller design which was based on PLC(programmable logic controller) as well as selection of mechanical and electrical components.The challenge was to use the available components in Iraq with reasonable costs. The robot mentioned is fully automated using programmable logic controller PLC(Zelio type SR3-B261BD),with 16inputs and 10 outputs. The PLC was implemented in FBD logic to obtain three different automatic motions with high efficiency withouterror,where the two links can stop in a certain points and link 3 bushed down for doing the task in a desired trajectory motion by programming the PLCcontroller.

Keywords: DoF, FBD, PLC, SCARArobot.
Recovery of Platinum and Palladium from Scrap Automotive Catalytic Converters
Authors: Hammadi Mohammed Qasim , Yassen Rabiha Saleh , Abid Kadhim Noori
Published: April 2019

Abstract

    

The hydrometallurgical method was used to platinum and palladium leaching with aqua regia solution (3HCl: HNO3). The leaching experiments were designed to obtain the optimum conditions by using Taguchi method with 16 experiments at three different factors (time, temperature and solid to liquid ratio), and each factor has four different levels. In this study, leaching the powder sample of catalytic converter that contains platinum and palladium was conducted on the basis of the formation of chloro complexes platinum and palladium (PtCl62-, PdCl42-) with different concentrations in the acidic solution. The optimum conditions for leaching process are (time = 120 minutes, temperature = 100°C, and solid to liquid ratio = 1/20).The best efficiency for platinum and palladium leaching at these conditions were 97.58%, 93.23%, respectively. After leaching process at optimum conditions, platinum was firstly precipitated in the form of (NH4)2PtCl6 (ammonium chloroplatinate) by adding (5ml/l) of ammonium chloride (NH4Cl) as a precipitant agent .Then, palladium was precipitated in the form of (NH4)2PdClO3 (palladium ammonium chlorate) by adding (5g/l) of sodium chlorate (NaClO3) as a precipitant agent to the remaining solution after the removal of platinum. The best efficiency for platinum and palladium recovery at optimum leaching conditions were 91.94%, and 98.82%, respectively.

                                                                                  

Keywords: Aqua regia, catalytic converter, PGMs, Platinum, Palladium, recovery, catalytic converter, 3HCl:HNO3.
Numerical Investigations on Heat Flow of Nanofluids in Ribs Tube Configurations
Authors: Salman Sami D. , Abd Alsaheb Ramzi Ata
Published: April 2019

Abstract

In this paper presents two dimensional turbulent flow of different nanofluids and ribs configuration in a circular tube have been numerically investigation using FLUENT 6.3.26. Two samples of CuO and, ZnO nanoparticles with 2% v/v concentration and 40 nm as nanoparticle diameter combined with trapezoidalribs with aspect ratio of p/d=5.72 in a constant tube surface heat flux were conducted for simulation. The results showed that heat flow as Nusselt number for all cases raises with Reynolds number and volume fraction of nanofluid, likewise the results also reveal that ZnO with volume fractions of 2% in trapezoidal ribs offered highest Nusselt number at Reynolds number of Re= 30000.

Keyword: Heat transfer augmentation, Friction factor, Thermal performance factor, Ribs configuration, CFD simulation, Fluent.
Corrosion Behavior of Nanocomposite Al-9 wt% Si Alloy Reinforced with Carbon Nanotubes
Authors: Ismeal Mustafa K. , Hassan Kharia S. , Hussian Hussian A.
Published: April 2019

An effort is made to study the effect of composite nanocoating using aluminum-9%wt silicon alloys reinforced with different percentage (0.5,1,2,4)wt.% of carbon nanotubes (CNTs) using  plasma spraying. The effect of this composite on corrosion behavior for AA6061-T6 by extrapolation Tafel test in sea water 3.5wt% NaCl was invested. Many specimens where prepared from AA6061-T6 by the dimension (15x15x3)mm as this first set up and other steps include coating process, X-ray diffraction and SEM examination .The results show the CNTs increase the corrosion rate of the nanocomposite coatings with increasing the weight percentage of CNTs within the Al-Si matrix. Al-9wt%Si coating layer itself has less corrosion rate if compared with both nanocomposite coating and the substrate of AA6061-T6.
Design and Implementation of a Pharmaceutical Inventory Database Management System
Authors: Samaan Sama Salam
Published: April 2019

The main aim of this paper are the design and implementation of a pharmaceutical inventory database management system. The system was implemented by creating a database containing information about the stored medicines in the inventory, customers making transactions with the pharmaceutical trading company (which owns the inventory), medical suppliers, employees, payments, etc. The database was connected to the main application using C sharp. The proposed system should help in manag inginventory operations which include adding/updating employees’ information, preparing sale and purchase invoices, generating reports, adding/updating customers and suppliers, tracking customer payments and checking expired medicines in order to be disposed. The system can be used to facilitate smooth workflow of sale and purchase operations and bring the advantages of having the most efficient control with minimal efforts.
Study the Catalytic Activity of CeO2 Catalyst for the Oxidative Degradation of Orange G Dye in Aqueous Solution
Authors: Alwash Atheel
Published: April 2019

The oxidative degradation of Orange G dye by nanosized CeO2 catalyst has been performed in this study. The catalyst was prepared by precipitation method. Various characterization techniques were carried out to study the physical and chemical properties of the synthesized catalyst. The XRD result confirms well the formation of CeO2 cubic phase.  The FTIR result showed the effect of calcination temperature for CeO2 was clearly observed due to reduction in band intensity compared to uncalcined Ce nitrate sample. Meanwhile, the diffused reflection spectra recorded reflection spectra at 414 nm with an energy gap of 3.2 ev. The decolorization of Orange G dye by oxidation process were carried out  under various conditions such as,  the  effects  of  H2O2 dosage ,  pH, catalyst dosage  and  the  temperature of reaction. The optimum conditions for the highest decolorization efficiency (100%) were achieved at 10 mg/L of orange G  dye with catalyst  dosage of 1.5 g/L, pH 2, reaction temperature of 65 °C and 0.1 mL H2O2.
The Effects of Long-Term Operation and High Temperature on Material Properties of Austenitic Stainless Steel Type 321H
Authors: Al-Khazraji Ahmed Naif , Amin Samir Ali , Al-Warmizyari Husam Ahmed
Published: April 2019

Changes in mechanical properties of material as a result of service in different conditions can be provided by mechanical testing to assist the estimation of current internal situation of these materials, or the degree of deterioration may exist in furnaces serviced at high temperature and exceed their design life. Because of the rarity works on austenitic stainless steel material type AISI 321H, in this work, ultimate tensile strength, yield strength, elongation, hardness, and absorbed energy by impact are evaluated based on experimental data obtained from mechanical testing. Samples of tubes are extracted from furnace belong to hydrotreaterunit, also samples from un-used tube material are used to make comparisons between these properties. Tensile properties of stainless steel (AISI 321H) were decreased as temperature increases; the trend of properties decreasing for the samples of un-used tube material is the same for the ex-used material. The trend of stress-strain curve will not change due to elevated temperature exposure for long time of service, except the yield strength will be higher in this diagram. The yield strength increased under these conditions, but the ability of material  which is elongated will decrease. Hardness and absorbed energy increased by 11.28 and 14% respectively when the material is aged for long time under effect of high temperature accompanied with creep effect.

Keywords:  Hardness, Impact, Mechanical Properties, Stainless Steel 321H, Mechanical Properties, Tensile Strength, Tube Furnace.
Improvement of Mechanical and Rheological Properties of Natural Rubber for Anti-Vibration Applications
Authors: Abd Ali Nabel k. , Farhan Malia. M. , . Moosa Abbas S
Published: April 2019

Abstract  

This research aims to study and improve the passivating specifications of rubber resistant to  vibration. In this paper, seven different rubber recipes were prepared based on mixtures of natural rubber(NR)  as an essential part in addition to the synthetic rubber (IIR, BRcis, SBR, CR)with different rates. Mechanical tests such as tensile strength, hardness, friction, resistance to compression, fatigue and creep testing in addition to the rheological test were performed. Furthermore, scanning electron microscopy (SEM)test was used to examine the structure morphology of rubber. After studying and analyzing the results, we found that, recipe containing (BRcis) of 40% from the natural rubber has the best mechanical and physical specifications to be used in applications that require the presence of rubber, resistant to vibration.

Keywords: Ant vibration behavior , Natural rubber, Synthetic rubber, master batch.