bluuebunny/crossref_metadata_2025_split huggingface dataset:
Flow Stress Evolution of P/M Nickel-base Superalloy During High-temperature Plastic Deformation
Authors: Fang Shuang , Zhang Mincong , Dong Yunpeng 
Published: October 2020

AbstractIn this work, the use of scanning electron microscopy, transmission electron microscopy, electron backscatter diffraction technique and experimental study of the nickel-base superalloy FGH96 recrystallization behavior of alloy. Through experimental study found that the thermal deformation, FGH96 alloys under different plastic deformation at high temperature deformation process parameters, mainly dynamic softening and strain hardening in two stages.
Experimental Study on the Preparation of Recycled Fine Aggregate
Authors: Zhong Weiqiu , Li Wuxu , Xiong Shengyuan , Zhou Aijun , Li Lintao 
Published: October 2020

Abstract
In this paper, the waste concrete is used to produce recycled fine aggregate, and then different mixing quantities are used to produce ordinary mortar by replacing artificial sand. The paper makes relevant studies on the influence of the recycled fine aggregate quantity on the performance of ordinary mortar. The studies show that it is feasible to produce ordinary mortar with a certain amount of recycled fine aggregate instead of artificial sand, which can meet the requirements of relevant standards, specifications and engineering.
Optimization of the Extraction Process of Anti-Vibrio parahaemolyticus Active Substances from Coptidis Rhizoma (Huanglian)
Authors: Wang Xintong , Guo Siya , Zhang Zongyi , Xu Qian , Guo Lei 
Published: October 2020

Abstract
The purpose of this study is to optimize the extraction process of the anti-Vibrio parahaemolyticus active substances from Coptidis rhizoma (Huanglian). Single factor experiment, Box-Behnken experimental design combined with response surface methodology were used to optimize the extraction process. The obtained optimal extraction conditions followed as: extraction solvent is 100% methanol, extraction temperature of 86 °Q liquid/material ratio of 21 mL/g’ extraction time of 116 min. The actual value of the inhibition zone of the extract can reach 15.62±0.16 mm, which is not significantly different from the predicted value of 15.12 mm. This indicates that the above method is feasible to optimize the extraction process of the anti-V. parahaemolyticus active substances from Coptidis rhizoma.
Reason of Intermediate Casing Wear in Ultra-deep Wells in China’s Tarim Oil Field
Authors: Ma Chao , Gao Baokui , Wang Jieli , Hu Tianxiang , Chen Xingwang 
Published: October 2020

Abstract
The intermediate casing wear is often found in ultra-deep wells in Tarim area. This phenomenon usually leads to many troubles in following well construction. By investigating 9 wells in this area that have severe intermediate casing wear, it is found that all casings are badly cemented, and the reason of casing wear is supposed to be helical buckling of casing string. In order to verify this judgment, geometry relationship among enlarged wellbore, buckled casing string and drill pipe joint are studied. When helical buckling occurs in casing string, apparent inner diameter of casing is usually smaller than the outer diameter of drill pipe joint. Therefore, rotating drill pipe joints wear casing inner surface continuously and forms a spiral scratch. Key factors that affect casing wear, such as wellbore enlargement rate, casing dimensions, casing centralizer and diameter of drill pipe joint, are discussed.
Effect of Grinding Parameters on the Hardness Penetration Depth of the Steel GCr15 in Internal Grind Hardening Process
Authors: Hou Dapan , Gao Shunxing , Liu Judong , Huang Songwei 
Published: October 2020

Abstract
This paper discusses the effects of the depth of cut (ap
), the workpiece speed (vw
) and the grinding wheel speed (vs
) on the structure and hardness of the grind hardening layer on the steel GCr15. It was found that the completely hardened zone of the internal grind-hardened layer on the steel GCr15 mainly contains needle-shaped martensite and a very low amount of carbides and retained austenite. The grinding parameters have no significant effect on the martensite microstructure and hardness of the high-hardness zone in the internal grind-hardening process. An increase of the depth of cut and the grinding wheel speed or a decrease of the workpiece speed, leads to a thicker grind-hardening layer. From the viewpoint of increasing the hardness penetration depth, a larger the depth of cut and the grinding wheel speed and a smaller the workpiece speed should be selected, under the internal grind-hardening experimental conditions.
Influences of Casing Wear on Mechanical Behavior of Packer Element
Authors: Wang Jieli , Gao Baokui , Ma Chao , Hu Tianxiang , Chen Xingwang 
Published: October 2020

Abstract
Packer element is made of hyperelastic rubber, and its mechanic performance determines the packer’s sealing effect. In oil field, casing wear is often found and in some special circumstance the packer has to set at worn casing section. In order to study the effect of casing wear on element mechanical behavior, contact pressure between element and casing with crescent-shaped wear notch is calculated by use of commercial ANSYS software. The influences of notch depth and diameter of drill pipe joint on contact pressure are discussed in detail. The results show that the contact pressure has a saddle-shaped distribution along axial direction similar to that without wear. But minimum contact pressure decreases rapidly when the notch depth increases. And a larger diameter of drill pipe joint can give rise to lower contact pressure near the notch.
Microstructure and Impact Toughness of X70–L245 Butt Girth Weld in Natural Gas Station
Authors: Ren Junjie , Ma Weifeng , Hui Wenying , Tong Ke , Nie Hailiang , Wang Ke , Dang Wei , Cao Jun 
Published: October 2020

Abstract
At present, the numerical simulation and safety evaluation of girth welds are based on the properties of tubular materials, which cannot truly reflect the properties of girth welds. Based on the investigation results of girth weld in the station, this paper took X70 (21mm) and L245 (12mm) joints with large material and wall thickness gap in the station as research objects, prepared girth weld according to the welding process in the project site, and studied the structure and impact toughness of the joints. The microstructure of weld zone was analyzed by optical microscope. Charpy impact toughness increased from the center of weld to both sides, and the center of weld was the lowest. On X70 side, the impact toughness of FGHAZ is the highest and the impact energy is about 200 J, which is significantly higher than the weld center. The impact toughness near the fusion line on side L245 is the highest, but significantly smaller than that on side X70. Grain refinement, interlacing structure and M/A structure are conducive to the improvement of impact toughness. In this kind of girth weld, the center of the welding seam is the weakest area, and the X70 side has a significantly higher toughness.
Recovering Vacuum Drying Exhaust Latent Heat by Steam Recompression with a Jet Pump
Authors: Li Xuanyou , Gao Ling , Sun Rongfeng , Yang Liguo 
Published: October 2020

Abstract
Recovery of latent heat is one of the most efficient methods to reduce drying energy consumption. This paper presents a system to recovery exhaust latent heat for vacuum drying. Replacing water with heat conduct oil, a hydraulic Jet was employed to evacuate the dryer and compress the exhaust vapour. The heated vapour, which is increased its temperature and pressure by means of recompression, was transferred to the vacuum dryer as the heat source through a heat pipe. This design was confirmed by a series of experiments with oil sludge.
Design and Realization of a Special Robot Manipulator
Authors: Tan Yingqi 
Published: October 2020

Abstract
A structure of small special robot manipulator is designed by using the parallelogram lifting device. The stiffness and strength for the manipulator are both improved to meet indicators and functions of the performance by design and calculation. The grasping range of the manipulator is enlarged and the grasping force is enhanced by comparing different materials according to the simulation on Solidworks. The object can be grasped accurately by the manipulator. This kind of structure design provides a reference for a robot manipulator.
Research on the Technology of Integral Water Searching and Plugging for Two-Stage Casing Gas-Lift Wells in Sudan Oilfield
Authors: Xu Dekui , Cai Meng , Xu Hao , Liu Chongjiang , Lin Zhongchao , Song Xingliang , Zhao Lichuan , Sun Jiang , Gao Fei , He Qing , Zhang Pingan , Liu Yun , Zhao Xuyang , Liu Yuchuan , Wang Pengcheng 
Published: October 2020

Abstract
The combination structure of

9

5
8

”

and

5

1
2

”

casing is used in some gas-lift wells in Sudan Oilfield. The existing mechanical water searching and plugging technology cannot meet the technical requirements of this type of well, so a integral water searching and plugging string for two-stage casing gas-lift well is developed. The string is composed of two kinds of packers and one kind of regulator. The two kinds of packers are set by hydraulic pressure synchronously to seal the layers of two kinds of casing. After the packers are set, the steel wire is used to fish and drop the blanking plug and search the water layer by layer to realize the adjustment of production layers. This process string has the characteristics of accurate water layer searching, reliable sealing, dynamic adjustment, etc. The string can realize water searching and plugging for two-stage casing wells by one trip. The string has been applied in well JS-2 in Sudan. After adjustment and plugging, the water cut is 25.6% lower than before. The effect of water control and oil production increase is significant, and the production life of the well is prolonged.
Flow Behaviour and Microstructure Evolution of 2196 Alloy during Isothermal Compression
Authors: Cao Hailong , Tian Yuxing , Du Kang , Niu Guanmei , Liu Cheng 
Published: October 2020

Abstract
The isothermal compression test of 2196 alloy was carried out by Gleeble-1500 isothermal simulator with deformation temperature from 430°C to 500°C and strain rate from 0.01s−1 to 10s−1. The results show that the stress-strain curves are stable flow for the most deformation parameters. These stable flow exhibit a good ductility of 2196 alloy, also confirmed by no crack on the edge of the compressed samples. The constitutive equation is established using exponential relationship and the average activation energy Q is189.2kJ/mol. Microstructure observation show that very few recrystallized grains at original grain boundaries and triple junctions for the all deformation parameters. It is clear that the dynamic recrystallization is difficult for the 2196 alloy suffered common thermal deformation, while the main microstructure evolution mechanism is dynamic recovery. At the same deformation temperature, the recrystallization fraction decreases with increased strain rate, while the proportion of subgrain increases. The recrystallization and dynamic recovery are two main factors for the microstructure characteristics.
Study of surface chemical composition of oxide nanostructures by X-ray photoelectron spectroscopy
Authors: Nalimova S S , Shomakhov Z V , Bobkov A A , Ryabko A A , Kalazhokov Z Kh , Maximov A I , Moshnikov V A 
Published: October 2020

Abstract
Zinc oxide and zinc stannate nanowires were synthesized by hydrothermal method. Zinc oxide nanowires were doped by iodine. The formation of multicomponent and doped oxides was studied by X-ray photoelectron spectroscopy. It was found that formation of zinc stannate from zinc oxide nanowires occurs in 1 hour. The percentage of OH-groups increases on the surface of zinc oxide nanowires as a result of doping by iodine.
Investigation and identification of the spectral composition of noise in the accelerometer channel of the navigation module
Authors: Pavlov D V , Petrov M N 
Published: October 2020

Abstract
The paper studies and measures the characteristics of random error components of the output signal in the accelerometer channel of an inertial navigation module, in which the MMA7331LT accelerometer is used. The spectral composition of the random components of the errors of the accelerometer was estimated using the Allan method of aeration. The calculated values of the coefficients characterizing the intensity of various types of noise are obtained.
Modeling non-standard probability laws based on a mixture of truncated distributions
Authors: Tokmachev M S 
Published: October 2020

Abstract
A method for modeling probability distributions is presented using two operations: truncating multiple base distributions in various ways, and converting them to a mixture. The normal distribution is considered as the basic one. The use of truncations and varying the truncation intervals of the mixture components lead to distributions with a complex non-standard configuration, in particular, asymmetric and multi-vertex ones. Distributions simulated in this way are used as theoretical ones in computer programmed fitting to sample data with a non-standard structure. The conditions for the continuity of the final distribution are obtained. The construction algorithm allows implementing other distributions.
Quantum-mechanical calculations of mixing enthalpy of the bcc phase of the Fe-Mo system for the ground state
Authors: Udovsky A L , Vasilyev D A 
Published: October 2020

Abstract
The structural energies, formation enthalpies and bulk elastic moduli of bcc iron and molybdenum in the Fe – Mo system, are calculated for further use in the calculations of the bcc / bcc + Fe2Mo Laves phase boundary at low (room) temperatures.
Temperature dependence of the catalytic activity of promising nanomaterials based on biopolymers: lipase and chitosan
Authors: Zaitsev S Yu , Zaitsev I S 
Published: October 2020

Abstract
A study of the interactions of porcine pancreatic lipase (PPL) with chitosan is the most interesting and important in order to regulate the enzymatic properties of the future nanomaterials based on these biopolymers. A decrease in catalytic activity of pure PPL towards triacetin during prolonged operation and storage is shown: activity decreases by 24.1% within 1 hour and by 54.0% - in the case of the lipase storage in solution for 1 month. The optimum temperature of 40°C was determined for samples of pure PPL, whereas a small shift from 40° to about 45°C - for PPL:Chit complex (50:1). The catalytic activity of free PPL at 40°C was the highest (as compared to lower and higher temperatures) and stable for 20 min. However, the dynamics showed a pronounced decrease to almost 2 times within further 30-60 minutes. In contrast, at 40°C the catalytic activity of PPL in complex with chitosan (50:1) stabilized at almost the same level (although it was lower than the activity of free PPL in the first 30 minutes of measurement). The PPL:Chit complex can be considered as promising catalytic nanomaterials (based on chitosan and lipase) for further applications.
Using the same type of IP-cores in the Virtex-6 family FPGA-architecture for distributed image processing
Authors: Zakharov V M , Shalagin S V , Eminov B F 
Published: October 2020

Abstract
Distributed image processing in real time is a relevant task. An effective solution to this problem at the hardware level is possible on the basis of creating prototypes of devices on FPGA. In this regard, the paper solves the problem of distributed computation of two-dimensional fast Fourier transform (TDFFT) based on the same type of IP-cores implemented in the architecture of the Virtex-6 family_FPGA-architecture. The possibility of distributed implementation of each of the stages of the TDFFT, performed using four transformations of the “butterfly” type_(TrB) over four elements of the processed data array, is shown. When using a specialized CAD-system, estimates of the time and hardware complexity of the IP-core implementing TrB are_obtained. The estimated operating frequency of this_IP-core is approximately 108 MHz. Hardware complexity estimates by the number of configurable elements involved in the Virtex-6 family_FPGA-architecture are determined. TrB must be performed over an_array of N
2 elements a · N
2/4 once, where a = log2
N is the number of TDFFT stages, and N = 2
k
. The ability to parallelize the specified operations at each of a stages by using_IP-cores that implement four TrB is shown. The results can be used to estimate hardware and time costs for distributed TDFFT execution over a square data array N × N - dimension.
Indirect, experimental constraints of (n,γ) reaction rates for the i- and r-process
Authors: Larsen A. C. , Spyrou A. , Guttormsen M. , Liddick S. N. 
Published: October 2020

Abstract
Our Universe contains a large variety of chemical elements, for which only the lightest ones were produced during the Big Bang. To make elements heavier than iron, neutron-capture processes are called for, in particular the slow and the rapid neutron-capture processes. Recently, a so-called intermediate neutron-capture process has received a lot of attention as more and more evidence points towards its existence. Both the intermediate and rapid neutron-capture processes involve very neutron-rich nuclei, for which there exist little or no data on their neutron-capture cross sections. Here we present an experimental method to indirectly constrain neutron-capture reaction rates needed for calculating nucleosynthesis yields for the intermediate and rapid neutron-capture processes.
How accurately can the Extended Thomas-Fermi method describe the inner crust of a neutron star?
Authors: Shelley M. , Pastore A. 
Published: October 2020

Abstract
We perform a systematic comparison between the results obtained by solving fully self-consistently the Hartree-Fock-Bogoliubov equations, and those obtained using the semi-classical Extended Thomas-Fermi method, for various Wigner-Seitz cells within the inner crust of a neutron star. The lack of pairing correlations in the semi-classical approach leads to a large discrepancy between the two approaches. This discrepancy is well beyond the error of the quantum-mechanical calculation, and is related to spurious shell effects in the neutron gas.
Writing Apartheid: Ethnographic Collaborators and the Politics of Knowledge Production in Twentieth-Century South Africa
Authors: Cabrita Joel 
Published: October 2020

Abstract
Knowledge production in apartheid-era South Africa was a profoundly collaborative process. In particular, throughout the 1930s–1950s, the joint intellectual labor of both Africans and Europeans created a body of knowledge that codified and celebrated the notion of a distinct realm of Zulu religion. The intertwined careers of Swedish missionary to South Africa Bengt Sundkler and isiZulu-speaking Lutheran pastor-turned-ethnographer Titus Mthembu highlight the limitations of overly clear demarcations between “professional” versus “lay” anthropologists as well as between “colonial European” versus “indigenous African” knowledge. Mthembu and Sundkler’s decades-long collaboration resulted in a book called Bantu Prophets in South Africa ([1948] 1961). The work is best understood as the joint output of both men, although Sundkler scarcely acknowledged Mthembu’s role in the conceptualization, research, and writing of the book. In an era of racial segregation, the idea that African religion occupied a discrete, innately different sphere that the book advanced had significant political purchase. As one of a number of African ideologues supportive of the apartheid state, Mthembu mobilized his ethnographic findings to argue for innate racial difference and the virtues of “separate development” for South Africa’s Zulu community. His mysterious death in 1960 points to the high stakes of ethnographic research in the politically fraught climate of apartheid South Africa.
Tracing Lung Cancer Risk Factors Through Mutational Signatures in Never-Smokers
Authors: Landi Maria Teresa , Synnott Naoise C , Rosenbaum Jennifer , Zhang Tongwu , Zhu Bin , Shi Jianxin , Zhao Wei , Kebede Michael , Sang Jian , Choi Jiyeon , Mendoza Laura , Pacheco Marwil , Hicks Belynda , Caporaso Neil E , Abubakar Mustapha , Gordenin Dmitry A , Wedge David C , Alexandrov Ludmil B , Rothman Nathaniel , Lan Qing , Garcia-Closas Montserrat , Chanock Stephen J 
Published: October 2020

AbstractEpidemiologic studies often rely on questionnaire data, exposure measurement tools, and/or biomarkers to identify risk factors and the underlying carcinogenic processes. An emerging and promising complementary approach to investigate cancer etiology is the study of somatic “mutational signatures” that endogenous and exogenous processes imprint on the cellular genome. These signatures can be identified from a complex web of somatic mutations thanks to advances in DNA sequencing technology and analytical algorithms. This approach is at the core of the Sherlock-Lung study (2018–ongoing), a retrospective case-only study of over 2,000 lung cancers in never-smokers (LCINS), using different patterns of mutations observed within LCINS tumors to trace back possible exposures or endogenous processes. Whole genome and transcriptome sequencing, genome-wide methylation, microbiome, and other analyses are integrated with data from histological and radiological imaging, lifestyle, demographic characteristics, environmental and occupational exposures, and medical records to classify LCINS into subtypes that could reveal distinct risk factors. To date, we have received samples and data from 1,370 LCINS cases from 17 study sites worldwide and whole-genome sequencing has been completed on 1,257 samples. Here, we present the Sherlock-Lung study design and analytical strategy, also illustrating some empirical challenges and the potential for this approach in future epidemiologic studies.
Development and perceived value of a master’s degree in health-system pharmacy administration training
Authors: Colmenares Evan W , McLaughlin Jacqueline E , Morbitzer Kathryn A , Eckel Stephen F 
Published: October 2020

Abstract

Purpose
To describe the development, format, and alumni and employer perceptions of a program combining a master of science (MS) degree with a residency in health-system pharmacy administration and leadership (HSPAL).

Summary
A multisite combined MS and HSPAL residency program was developed within the University of North Carolina at Chapel Hill Eshelman School of Pharmacy to increase leadership and management education. The program balances clinical and administrative experiences with didactic courses over 2 years. The program format and perceived value of MS degree training for HSPAL residents had not been previously described in the literature. In an online survey, alumni of the program, as well as their first supervisors after completion of HSPAL training, indicated perceived attainment of the program core competencies and outcomes. Supervisors also indicated that they were more likely to hire MS degree–trained pharmacists for administrative positions.

Conclusion
Didactic training in the form of an MS degree as a part of comprehensive HSPAL residency training is perceived as beneficial by alumni and employers for promoting the development of core leadership and management skills and knowledge.