bluuebunny/crossref_metadata_2025_split huggingface dataset:
The pentapeptide-repeat protein, MfpA, interacts with mycobacterial DNA gyrase as a DNA T-segment mimic
Authors: Feng Lipeng , Mundy Julia E. A. , Stevenson Clare E. M. , Mitchenall Lesley A. , Lawson David M. , Mi Kaixia , Maxwell Anthony 
Published: March 2021

SignificancePentapeptide-repeat proteins, such as MfpA and Qnr proteins, have an intriguing right-handed quadrilateral β-helical fold that gives rise to an elongated roughly cylindrical structure that resembles the shape of a double-stranded DNA helix. It has been speculated that these proteins, particularly those that interact with bacterial DNA gyrase, act as DNA mimics, competing with DNA to fulfil their functions. Until now there has been no direct evidence for this. Using enzymology and X-ray crystallography, we show the mycobacterial MfpA appears to act as a mimic of the transported (T) DNA segment during the gyrase supercoiling cycle, protecting the enzyme from fluoroquinolone antibiotics. These data suggest a mechanism to limit fluoroquinolone efficacy.
Therapy for Argentine hemorrhagic fever in nonhuman primates with a humanized monoclonal antibody
Authors: Zeitlin Larry , Cross Robert W. , Geisbert Joan B. , Borisevich Viktoriya , Agans Krystle N. , Prasad Abhishek N. , Enterlein Sven , Aman M. Javad , Bornholdt Zachary A. , Brennan Miles B. , Campbell Lioudmila , Kim Do , Mlakar Neil , Moyer Crystal L. , Pauly Michael H. , Shestowsky William , Whaley Kevin J. , Fenton Karla A. , Geisbert Thomas W. 
Published: March 2021

Significance
Despite the relatively high disease burden of arenaviruses in South America and Africa, there are currently no Food and Drug Administration-approved drugs for use in preventing or treating any arenavirus infection. Currently, the sole clinically validated treatment option for Argentine hemorrhagic fever (AHF), caused by Junin virus (JUNV), is administration of immune plasma. While the relative success associated with this treatment supports passive immunotherapy interventions, the recent expansion of mAbs used in a clinical setting for infectious diseases offer a highly specific, consistently potent, and generally safe alternative to immune plasma. Here we show that a humanized mAb is highly efficacious in guinea pig and nonhuman primate models of AHF.
Life expectancy in adulthood is falling for those without a BA degree, but as educational gaps have widened, racial gaps have narrowed
Authors: Case Anne , Deaton Angus 
Published: March 2021

SignificanceWithout a 4-y college diploma, it is increasingly difficult to build a meaningful and successful life in the United States. We explore what the BA divide has done to longevity, focusing on a measure of expected years lived between ages 25 and 75. In the richest large country in the world, with frontier medical technology, expected years lived between 25 and 75 declined for most of a decade for men and women without a 4-y degree, even prior to the arrival of COVID-19. For those with and without a BA, racial divides narrowed by 70% between 1990 and 2018, while educational divides more than doubled for both Black and White people.
Organization of cooperation in fractal structures
Authors: Peng Dan , Li Ming 
Published: March 2021

Abstract
It is known that the small-world structure constitutes sufficient conditions to sustain cooperation and thus enhances cooperation. On the contrary, the network with a very long average distance is usually thought of as suppressing the emergence of the cooperation. In this paper we show that the fractal structure, of which the average distance is very long, does not always play a negative role in the organization of cooperation. Compared to regular networks, the fractal structure might even facilitate the emergence of cooperation. This mainly depends on the existence of locally compact clusters. The sparse inter-connection between these clusters constructs an asymmetric barrier that the defection strategy is almost impossible to cross, but the cooperation strategy has a not too small chance. More generally, the network need not to be a standard fractal, as long as such structures exist. In turn, when this typical structure is absent, the fractal structure will also suppress the emergence of the cooperation, such as the fractal configuration obtained by diluting a random tree-like network. Our findings also clarify some contradictions in the previous studies, and suggest that both removing and inserting links from/into a regular network can enhance cooperation.
The determinant of slip plane and volume potential of landslide mass using resistivity data in Air Kuning Batu Merah, Ambon City
Authors: Souisa M , Sapulete S M , Isnawati  
Published: March 2021

AbstractTo reduce the risk of landslides and to be aware of areas that have the potential for further landslides, detailed measurements of these zones are required. Measurements were made to identify a sliding plane below the surface using the geoelectric resistivity method of the Wenner-Schlumberger configuration. The resistivity data from the interpretation results are used to determine slip plane’s slope and the potential for landslide masses. The research location is on steep hills in Air Kuning Batu Merah, Ambon City. The results showed that the slope angles for line-1 were 4.20 degrees, line-2 was 17.60 degrees, line-3 ranged from (22.80 - 23.20) degrees, and line-4 was 21.80 degrees. Furthermore, the estimated volume potential of landslide mass based on the cross-section of subsurface resistivity is 3,063.88 m3. With an indication of a landslide field, the slope has the potential for a subsequent landslide if affected by external and internal factors.
Design of PM2.5 and PM10 measuring instruments for analysis of air pollution distribution patterns in the dramaga area based on internet of things
Authors: Satria H , Soekirno S 
Published: March 2021

Abstract
Particulate Matter (PM) is the main material commonly used to show the degree of air pollution. PM material has an impact on human health and the visibility of the atmosphere. Standard gravimetric measurements and current commercial instruments for field measurements are still expensive and limited at several points in Indonesia. In this research, a low cost PM2.5 and PM10 measuring instrument was designed, with the application of the Internet of Things (IoT) to support real-time monitoring. This instrument can be used to increase the spatial and temporal resolution of PM data. The system uses the ZH03A which has a correlation of 0.8936 in PM2.5 and 0.8873 in PM10 through comparison with standard instrument. Sensor data is processed by a data logger which is connected to the internet via the ESP8266 module. This module has sent data to the database with 0% data loss on testing and sent to display the actual PM2.5 and PM10 values in a website. The results showed a negative correlation on temperature and positive correlation on humidity. The measurement system has recorded the distribution patterns of PM coming from the northwest of Dramaga.
Study of seawater intrusion in coastal aquifer using total dissolved solid, conductivity and salinity measurement in Labuhan Kertasari Village, West Sumbawa
Authors: Hilmi A , Ulfa A M , Wijaya A , Hadimi L I 
Published: March 2021

Abstract
Indonesia is an archipelagic country that has a larger ocean area than land, many people live in coastal areas and still experience difficulties in obtaining springs that can be used for their daily needs. This study was conducted to see the extent of seawater intrusion into a coastal aquifer in Labuhan Kertasari Village. The method of measuring Total Dissolved Solids, Conductivity, and Salinity is used in studying seawater intrusion into a coastal aquifer. Coastal aquifer samples were taken from open wells and boreholes belonging to residents which are actively used on a daily basis. Analysis of the relationship between TDS, conductivity and, salinity used simple linearity analysis, and distribution mapping using surfer 8. The highest TDS concentration, conductivity, and salinity were 5770 ppm; 8700 MS/cm; and 4600 ppm on the S8. While the TDS concentration, conductivity, and salinity were the lowest consecutively were 836 ppm; 1258 MS/cm; 700 ppm on S26. In general, the coastal aquifer in residents’ wells has experienced various intrusions and has decreased at a distance from the shoreline.
Development a practicum tools to measure the speed of the air using Arduino Uno Microcontroller
Authors: Indrasari W , Rustana C E , Zulfikar  
Published: March 2021

Abstract
This study aims to produce practicum tools that can measure the speed of the air. This tool uses the HC-SR04 ultrasonic sensor module as a sound wave transmitter and uses the Arduino UNO as a control system. The research method used is ADDIE. After the product has been developed, it is evaluated by conducting a validation test. Based on validation results, this practicum tool’s suitability has also been validated by the media expert. The following is the score achieved from each of the indicators, distance and time measurement score was 75%, appearance of practicum tool data was 100%, and clarify the concept was 75%. Therefore, the practicum tools as learning media to measure the air’s speed are fit for use.
Analysis of the radiation parameters of pumice constituent compounds using XCOM
Authors: Wirawan R , Qomariyah N , Ardianto T , Kurniawidi D W 
Published: March 2021

Abstract
In this study, analysis of radiation parameters (linear attenuation coefficient, mean free path and half value layer) of pumice constituent compounds was carried out. Analyzes were done on the compounds of Al2O3, Fe2O3, SiO2, CaO, K2O and Na2O with a theoretical approach using the XCOM program for gamma photon energies 57Co (0.122 MeV; 0.1365 MeV), 133Ba (0.356 MeV), 54Mn (0.835 MeV), 137Cs (0.662 MeV), 60Co (1.173 MeV; 1.333 MeV), 65Zn (1.1155 MeV), 22Na (0.511 MeV; 1.275 MeV) and 40K (1.461 MeV). The results show that the Fe2O3 compound has the largest linear attenuation coefficient, while the largest for MFP and HVL is Na2O among other compounds.
Ultrasonic Method as a Tool for Geotechnical Parameters Estimation at Proposed Engineering Site/Western Iraq
Authors: Al-Awsi Munther D. , Khorshid Salman Z. , Ahmed Muaiad T. 
Published: March 2021

Abstract
The objective of the present research is to confirm the possibility of ultrasonic methods as geophysical tool for the estimating of geotechnical parameters for engineering purposes. Thirty seven (37) rock samples were collected at different depths of borehole drilled at the study area, and both primary and secondary waves velocity (Vp and Vs) were measured in laboratory. To evaluate the rock competence as foundation material for engineering works, some important geotechnical parameters including Poisson’s ratio(σ), Stress Ratio(Si), Material index(Im), Concentration index(Ic), and Density gradient( Di) were calculated. The obtained results demonstrate that the first surface layer is characterized by incompetent to fairly competent materials, the second layer (Anah Formation) is characterized by alternation of the moderately competent ( limestone) with thin incompetent (coralline limestone) layer, while the third layer (Baba Formation ) which composed of dolamatic limestone is characterized by good geotechnical parameters, reflect good competent rocks representing more suitable rocks as foundation layer for civil engineering constructions at the investigated site. The results also confirm the efficiency of ultrasonic method in estimating and assessing the geotechnical parameters of rock samples in pre-construction studies.
A Certain Conditions on Some Rings Give P.P.Ring
Authors: Abed Majid Mohammed , Al-Sharqi Faisal , Zail Saad H. 
Published: March 2021

Abstract
Many new results were obtained in this paper about P.P. ring. Semi-primitive ring R with (dcc) on principal-ideal P is always P.P.ring. Also, St-G-P.P. ring R is given to answer new question; is B-rings are P.P. ring. Also regular and Von Neumann regular rings are introduced to find a relationship between P.P. ring and these kind of the rings.
Effect of Molecular Weight on Electro – Optic Switching Times of Liquid Crystal Polymer Doped with Ceo2 Nanoparticles
Authors: Hussein Alaa A. , Al-Ammar Khalid 
Published: March 2021

Abstract
Nonlinearity liquid crystal cell which doped with Ferroelectric nanoparticles characters studied in this paper according to their eclectic absorption. Polysiloxin series with side chain liquid polymers used with side chain polymers and molecular weight ran This study consternate on polymers electro. optic characteristic with various molecular weights by using the mesogenic units and a stable polysiloxane. Suspension sensitivity or Electro-visual response to the mark of the used electric field, a real character to electric liquid crystals. The addition of CeO2, nanoparticles to polymer rise dielectric anisotropy and minimize response times. It observed that the voltages raised with molecular weight rising, and when intensity value rise, we gain voltage operating. Spectrometer used infrared measurements to locate the orientational order parameters,

(

S

¯

)

for liquid crystals with a side series. The orientational order parameters

(

S

¯

)

rely on temperature with various molecular weights and the threshold voltage.
A Study of Preparing Samples of Hydroxyapatite with Different Densities Using Charcoal Powder
Authors: Saeed Ghazi K. , Essa Abbas F , Said Saja Abdul-Ammer 
Published: March 2021

AbstractThe powder of hydroxyapatite with the chemical formula Ca10(PO4)6(OH)2was prepared locally from cow bones in the hexagonal crystal phase, and this was confirmed through the X-ray diffraction system. The proportions that formed the prepared hydroxyapatite were confirmed through the X-ray fluorescence system and found the ratio of calcium oxide to phosphorous oxide is 1.718. The hexagonal phase of the prepared hydroxyapatite was also stabilized ( fixed ) for the samples before and after the heat treatment. Some physical and mechanical properties were also conducted for the prepared samples. It was found that it is possible to prepare samples of different densities by adding different proportions of carbon (charcoal) percentage to the prepared hydroxyapatite.
Solving the Nonlinear Monotone Equations by Using a New Line Search Technique
Authors: Hashim K. H. , Hashim L H , Dreeb N k , Shiker Mushtak A. K. 
Published: March 2021

Abstract
In this work a new technique of line search is proposed to solve the nonlinear monotone equations. For this purpose we combine a modified line search rule with monotone technique. The new proposed algorithm can decrease the CPU time, the number of iterations and the functions evaluations and can increase the efficiency of the approach. The global convergence result of the recommended procedures is established under some standard conditions. Preliminary numerical results indicate that the proposed algorithm are interesting and remarkably promising.
Model Parameterization for Coherent Manipulation in Spin Current through FM-QD1-QD2-FM
Authors: Najdi M. A. , Al-Mukh J. M. , Jassem H. A. 
Published: March 2021

Abstract
In this work, model parameterization for coherent manipulation, for serially coupled double quantum dots embedded between ferromagnetic leads (FM-QD1-QD2-FM), is presented. Theoretical model based to the non-equilibrium Green’s function approach is considered. Since the spin current and its spin channels are formulated incorporating the spin polarization and the type of spin configuration on the leads. Our model incorporates the inter-dot hopping, the intra-dot Coulomb correlation, the spin exchange energy and the coupling interactions between the quantum dots and leads. The results concerned to the parallel configuration at strong inter-dot coupling regime shows the preferable coherent state for spin down electrons only at relatively high polarization. While, for weak coupling regime and antiparallel configuration, the decoherent state is dominating. Interesting results have been concluded by calculating the molecular energy levels of the quantum dots. In all our calculations the same spin polarization on the leads is considered. The case of different spin polarization on the lead is also investigated but no unprecedented features are concluded as active region is symmetric.
A New Shifted Conjugate Gradient Method”Based”on Shifted Quasi-Newton Condition
Authors: Jameel Marwan S , Abdullah Zeyad M , Fawzi Firas A , Hassan Basim A 
Published: March 2021

Abstract
In this article, the shifted quasi-Newton condition used to suggest a new shifted conjugate gradient method (CGM). The method of Idea and Zhang’s et al had been compounding to introduce a modren shifted conjugate gradient method (NSCGM). The propose style based on a hybrid the CGM with a shifted quasi-Newton conditions in which generate descent search direction. The global convergence properties will be hold by the proposed method. The proposed method obtained encourage results that compared with other methods in the literatures.
A Stochastic Differential Equations Model for Internal COVID-19 Dynamics
Authors: Kareem Ahmed M. , Al-Azzawi Saad Naji 
Published: March 2021

Abstract
In this article, we analyze stochastic differential equations model for internal coronavirus (COVID-19) dynamics. The stochastic differential equations model are expressed using the Ito’s formula. The Environmental stochasticity in this dynamical model is presented via parameters disturbance which is the standard method in the stochastic differential equations(SDEs) in the population modeling. We than prove that this model decided in this paper have a unique global positive solution because this is fundamental in any population dynamics model. The main aim of this paper, we formulate the interaction of coronavirus COVID-19 with host cells and presented the conditions required in order to the COVID-19 to die out. And this results also illustrated by computer simulation.
On the Bridge Between Computational Results Of New Line Search Technique
Authors: Al-Shimari Nofl Sh. , Jumaa Basim Rabaa , Al-Jilawi Ahmed Sabah. 
Published: March 2021

Abstract
The goal of this paper is to find a better linesearch technique and different combinations of optimization and linesearch algorithms. Line searchtechnique on the off chance that it looks for the base of a descent direction vector that, when processed iteratively with a sensible advance size.
Optimization of Poly (vinyl chloride) Surface Modification with an Aromatic Schiff Base-Ni (II) Complex as Photostabilizer
Authors: Hadi Angham G. , Saddam Nahlah Salman , Ahmed Dina S. , Yousif Emad 
Published: March 2021

Abstract
Though PVC is one of the most common synthetic polymers that differ from their analogues in low molecular weight alkyl halides in that they do not readily demonstrate the effects of simple nucleation. Chlorine removal is preferred in many condensation reaction situations, and the creation of the following double bond guarantees dark colored products. The chemical adaptation of poly (vinyl chloride) (PVC) with new functional thiol compound has been reported. A homogenous blend has been inserted to nickel chloride; the polymeric film were exposed to ultraviolet light for 300 hours. The structural changes in the modified film were observed by FTIR spectroscopy and losing in weight; the morphology of surface has been examined by optical microscope.
Map of Mode Hopping Associated with Modulated Laser Diode Under Feedback and Injection
Authors: Abbas Rasha Salah , Hemed Ayser A. 
Published: March 2021

Abstract
A new simple technique for narrow-linewidth and wavelength-tunable laser is experimentally satisfied. The technique is based on employing nonlinearities arise with laser feedback and injection. The main effect observed and controlled is the mode hopping (MH) within other nonlinearities. In this situation mixed optoelectronical feedback (OEFB) and optical injection from another identical type laser simultaneously, plays the role of controller. These results show that no need of using a Fiber Bragg Grating. As a well-known alternative technique used earlier to build a tunable laser. The map of validity for this effect and parameters affecting the laser output are all investigated. This technique enhances modulation index for the slave laser to be 100% and employs mode hoping generated in it for tuning output lasing frequency. This is by controlling either master laser detuning or injection strength or both. Also, by controlling slave laser optoelectronic feedback time delay (by a variable RF attenuator) or (and) nonlinear contribution for this by introducing a nonlinear function into the detected signal. Bidirectional (mutual) and unidirectional injection systems are experimented. In the first system both lasers multi-lasing in general synchronization manner, while in the last system, injector (master) laser stays immune from slave dynamics.
An Application Comparison of Two Poisson Models on Zero Count Data
Authors: Hashim L. H. , Hashim K. H. , Shiker Mushtak A. K. 
Published: March 2021

Abstract
Counting data (including zero counts) appear in a variety of applications, so counting models have become popular in many fields. In statistical fields, count data can be defined as observation types that use only non-negative integer values. Sometimes researchers may Counts more zeros than the expected. You may describe Excess zero as Zero-Inflation, excess zeros cause over-dispersion. So, the objective of this paper is use zero-inflated regression models (Poisson Regression model, Zero-Inflated Poisson (ZIP), and Zero-Altered Poisson (ZAP)) to analyse rainfall data and select the best model that deal with these type of data. It has been shown through the study and practical application that the advantage and quality of the Zero-Altered Poisson Regression (ZAPR) where the Zero-Altered Poisson regression model was the best count data model for our data, Although it is hard to distinguish Zero-Inflated Poisson (ZIP) regression model, it is better than Poisson regression model.
Low-Cost Pressure Sensors Fabricated from Novel Polymeric Nanocomposites
Authors: Jalil Hussien Huda Abdul , Kadhim Raheem G. , Hashim Ahmed 
Published: March 2021

Abstract
Nanocomposites (NCs) can be used in several fields, for example, solar cells, biosensors, diodes, antibacterial, transistors…etc. In this paper,(poly (ethylene oxide)-polyvinylpyrrolidone-silicon oxide nanoparticles-manganese dioxide nanoparticles) NCs have been manufactured for pressure sensors with low weight, high sensitivity and lowcost. The nanocomposites were made up of various concentrations of poly (ethylene oxide) (PEO)-polyvinyl pyrrolidone (PVP)-silicon dioxide nanoparticles (SiO2 NPs) and manganese dioxide nanoparticles (MnO2 NPs). The electrical conductivity and dielectric properties of the nanocomposite are studied at room temperature. The dielectric properties of the NCs are examined in the frequency range (100 Hz–5 MHz). The AC electrical conductivity, dielectric constant, and dielectric losses increase with the weight percentages of MnO2 NPs. The dielectric constants and dielectric losses decrease when a frequency increases. The A. C electrical conductivity increases with the concentration of MnO2 NPs and the frequency. The nanocomposite was tested for the pressure sensors application in the pressure range (80–160) bar. The experimental results show that the electric capacitance of nanocomposites samplesis increased, as the pressure increases. Also, the electric capacitance of NCs increases with an increase in the weight percentages of MnO2 NPs. The NCs has a high sensitivity to pressure.