bluuebunny/crossref_metadata_2025_split huggingface dataset:
Preparation and characterization of high-strength low-thermal-conductivity cement-based insulation materials
Authors: Zhang X X , Wang Z P , She A M , Wei Y Q , Zhu Z Y 
Published: July 2019

Abstract
Thermal insulation materials with high strength and ultra-low thermal conductivity are ideal construction ones for residential infrastructure. However, high strength of materials regularly means high thermal conductivity. To solve this problem, a novel thermal insulation material was prepared by using cement as the binder, silica fume as the mineral admixture, aerogel as the coarse filler and hollow SiO2 microsphere as the fine filler. The optimal proportion and preparation process were investigated by means of the orthogonal experiment and the single factor experiment method, respectively. On the other hand, their microstructures, in terms of aerogel particle size distribution and multi-scale composite structure were analysed by optical microscope, binarization image, scanning electron microscope. The results indicated that compared to conventional insulation materials, the produced materials in this study behaved much better performance in strength. The dry density, compressive strength and thermal conductivity reached 360 kg/m3, 4.55 MPa and 0.055 W/m·K, respectively. The incorporation of hollow SiO2 microsphere and silica fume led to the much thicker pore walls of the sample, and simultaneously the prolonging of stirring time resulted in the much smaller size of aerogel, which were considered as the two primary causes of its excellent mechanical performance.
Analysis of the causes of tube blocking in Jingbian gas field
Authors: Ye Congdan , Gou Shunchao , Feng Yuhan , Niu Buneng , Ma Yun 
Published: July 2019

Abstract
A large number of blockage appeared in gas wells and pipeline appeared, which caused plugging, corrosion and the increasing of wellbore pressure difference, and seriously affect the normal production of gas well of problems. In this paper, the water quality over the years and natural gas production of the JB1# well in the Jingbian gas field were analyzed, also include the composition of blockage with the chemical volumetric method (CVM), X-Ray Diffraction (XRD) and x-ray fluorescence (XFS) method. Meanwhile, the blockage powder was leached in simulated acid work solution, and then the leaching solution was analyzed with CVM. The experimental results show that the produced water in the JB1# well has unstable water quality, high salinity, high Cl- content, and low pH value, high H2S and CO2 content in natural gas, so easy to produce corrosion and carbonate scaling. The main component of the blockage is a mixture of corrosion product Fe2O3 and a small amount of CaCO3 scale. The corrosion product Fe2O3 is mainly generated by the mixture of dissolved oxygen, H2S, CO2 and other corrosion effects. The main cause of blockage in the JB1# well is the deposition of Fe2O3 and CaCO3 scales caused by the corrosive effects of dissolved oxygen, H2S and CO2.
Ultrasonic Evaluation of Young’s Modulus for Reduction of Brake Squeal Noise
Authors: Kim N 
Published: July 2019

Abstract
Elastic properties of friction materials in brake linings are important design parameters because modulus variations may lead to noise generation of braking systems. This paper is to describe about ultrasonic estimation of Young’s modulus of brake linings concerned with squeal noise problem for commercial trucks. Phase velocity of ultrasound propagating through brake lining was measured to calculate Young’s modulus based on elastic relations of acoustic waves with material properties. Two kinds of brake lining samples were produced with the same composition by different manufacturing process, one of which is a traditional product and the other is an advanced one developed for brake noise reduction. Five rectangular samples were cut out from each type of brake linings and machined for ultrasonic test. Acoustic pulse of 500KHz was applied to each sample to calculate the time-of-flight(TOF) for the measurement of wave velocity and Young’s modulus. The results of ultrasonic test indicate that the low noise brake samples have a less deviation of Young’s modulus than the traditional brake samples. This agrees with previous researches and FEM analysis that Young’s modulus variation of brake linings affects the squeal propensity and the instability of brake system.
Mechanical Design of Service Robot for Shuttlecock Sports
Authors: Chunlai Tian , Musheng Shen , Yixian Wang , Wei Gao 
Published: July 2019

Abstract
Shuttlecock ball is a popular sport in modern society which including entertainment, skills, mass, fitness, popularity and education. The current status artificial ball picking during the training and sports of the shuttlecock sports was reviewed in this paper. Based on the main structure and working principle of the picking robot, it was designed and presented here. It is designed by the three-dimensional CAD software. Through motion simulation analysis, the actual working process of the shuttlecock collection robot was shown. The structure design and motion simulation analysis of the whole machine were carried out and it verified the feasibility of the design. The shuttlecock collection robot is used of retrieving, sorting and placing the shuttlecock. It could effectively solve the inconvenience cause by the manual collecting in shuttlecock ball sports.
Research on dynamic characteristic of connecting rod with joint clearance
Authors: Li Shihua , Xu Jilong , Zhao Jie 
Published: July 2019

Abstract
In order to study the dynamic characteristics of revolving joint with clearance, the theoretical model of the revolving joint with clearance is established by using Newton Euler method and “contact-separation” state model. The kinetic equations are solved by using the Gear algorithm in MATLAB software. The change curves of the contact force and the center trajectory of the revolving joint shaft with clearance are obtained considering different clearance, contact stiffness, and rotational speed together. The research results have laid a theoretical foundation for improving the joint forces and the accuracy by using controller.
Mechanism analysis of bubbling corrosion caused by boiler flue gas on metal material
Authors: Zhang B Q , Wang S Z , Yang J Q , Cui C C , Jiang Z H , Wang D , Li J N 
Published: July 2019

Abstract
Hydrogen bubbling is a typical corrosion morphology caused by hydrogen sulfide corrosion. In order to explore hydrogen sulfide corrosion of iron, the composition of flue gas under actual conditions was simulated in this research. Hydrogen sulfide corrosion in flue gas of four kinds of materials selection of ground process pipeline and underground pipe string was researched experimentally. The pressure and temperature of hydrogen bubbling corrosion morphology under actual flus gas conditions were obtained. The electrochemical corrosion mechanism between iron and hydrogen sulfide was investigated.
A generalization of the theorems of Chevalley-Warning and Ax-Katz via polynomial substitutions
Authors: Baoulina Ioulia , Bishnoi Anurag , Clark Pete 
Published: July 2019

We give conditions under which the number of solutions of a system of polynomial equations over a finite field

F

q

\mathbb {F}_q

of characteristic

p
p

is divisible by

p
p

. Our setup involves the substitution

t
i

↦
f
(

t
i

)

t_i \mapsto f(t_i)

for auxiliary polynomials

f
1

,
…
,

f
n

∈

F

q

[
t
]

f_1,\dots ,f_n \in \mathbb {F}_q[t]

. We recover as special cases results of Chevalley-Warning and Morlaye-Joly. Then we investigate higher

p
p

-adic divisibilities, proving a result that recovers the Ax-Katz theorem. We also consider

p
p

-weight degrees, recovering work of Moreno-Moreno, Moreno-Castro, and Castro-Castro-Velez.
Stereoelectroencephalography: retrospective analysis of 742 procedures in a single centre
Authors: Cardinale Francesco , Rizzi Michele , Vignati Elena , Cossu Massimo , Castana Laura , d’Orio Piergiorgio , Revay Martina , Costanza Martina Della , Tassi Laura , Mai Roberto , Sartori Ivana , Nobili Lino , Gozzo Francesca , Pelliccia Veronica , Mariani Valeria , Lo Russo Giorgio , Francione Stefano 
Published: July 2019

AbstractThis retrospective description of a surgical series is aimed at reporting on indications, methodology, results on seizures, outcome predictors and complications from a 20-year stereoelectroencephalography (SEEG) activity performed at a single epilepsy surgery centre. Prospectively collected data from a consecutive series of 742 SEEG procedures carried out on 713 patients were reviewed and described. Long-term seizure outcome of SEEG-guided resections was defined as a binomial variable: absence (ILAE classes 1–2) or recurrence (ILAE classes 3–6) of disabling seizures. Predictors of seizure outcome were analysed by preliminary uni/bivariate analyses followed by multivariate logistic regression. Furthermore, results on seizures of these subjects were compared with those obtained in 1128 patients operated on after only non-invasive evaluation. Survival analyses were also carried out, limited to patients with a minimum follow-up of 10 years. Resective surgery has been indicated for 570 patients (79.9%). Two-hundred and seventy-nine of 470 patients operated on (59.4%) were free of disabling seizures at least 2 years after resective surgery. Negative magnetic resonance and post-surgical lesion remnant were significant risk factors for seizure recurrence, while type II focal cortical dysplasia, balloon cells, glioneuronal tumours, hippocampal sclerosis, older age at epilepsy onset and periventricular nodular heterotopy were significantly associated with seizure freedom. Twenty-five of 153 patients who underwent radio-frequency thermal coagulation (16.3%) were optimal responders. Thirteen of 742 (1.8%) procedures were complicated by unexpected events, including three (0.4%) major complications and one fatality (0.1%). In conclusion, SEEG is a safe and efficient methodology for invasive definition of the epileptogenic zone in the most challenging patients. Despite the progressive increase of MRI-negative cases, the proportion of seizure-free patients did not decrease throughout the years.
The Long-Term Impact of Early Life Stress on Orbitofrontal Cortical Thickness
Authors: Monninger Maximilian , Kraaijenvanger Eline J , Pollok Tania M , Boecker-Schlier Regina , Jennen-Steinmetz Christine , Baumeister Sarah , Esser Günter , Schmidt Martin , Meyer-Lindenberg Andreas , Laucht Manfred , Brandeis Daniel , Banaschewski Tobias , Holz Nathalie E 
Published: July 2019

Abstract
Early adversity has been related to brain structure alterations and to an increased risk of psychiatric disorders. The orbitofrontal cortex (OFC) is a key region for emotional processing, with structural alterations being described in several mental disorders. However, little is known about how its cortical thickness (CT) is affected by the long-term impact of life stress (LS) at different developmental stages. The present study aimed to investigate the effect of LS during infancy, childhood, and adolescence on CT alterations in the OFC and on psychopathology in 190 adults of an ongoing prospective cohort study. Chronic stressful life events were assessed in regular intervals. Participants rated depressive symptoms at the ages of 22 and 23 years. Morphometric data were collected at the participants’ age of 25 years. Chronic LS during infancy was associated with reduced CT in the right OFC and increased depressive symptoms. Moreover, the impact of chronic LS during infancy on OFC thickness was partially mediated by depressive symptoms in adulthood, suggesting an interplay of early LS, psychopathology, and CT alterations. Our findings highlight the long-term impact of early LS on an affective core brain structure and psychopathology later in life.
Outcomes after surgery for functional tricuspid regurgitation: a systematic review and meta-analysis
Authors: Veen Kevin M , Etnel Jonathan R G , Quanjel Thijs J M , Mokhles Mostafa M , Huygens Simone A , Rasheed Moniba , Oei Frans B S , ten Cate Folkert J , Bogers Ad J J C , Takkenberg Johanna J M 
Published: July 2019

Abstract

Aims
This study aims to provide a contemporary overview of outcomes after tricuspid valve (TV) surgery for functional tricuspid regurgitation (TR).

Methods and results
The literature was systematically searched for papers published between January 2005 and December 2017 reporting on clinical/echocardiographic outcomes after TV surgery for functional TR. A random effects meta-analysis was conducted for outcome variables, and late outcomes are visualized by pooled Kaplan–Meier curves. Subgroup analyses were performed for studies with a within-study comparison of suture vs. ring repair and flexible vs. rigid ring repair. Eighty-seven publications were included, encompassing 13 184 patients (mean age: 62.1 ± 11.8 years, 55% females). A mitral valve procedure was performed in 92% of patients. Pooled mean follow-up was 4.0 ± 2.8 years. Pooled early mortality was 3.9% (95% CI: 3.2–4.6), and late mortality rate was 2.7%/year (95% CI: 2.0–3.5), of which approximately half was cardiac-related 1.2%/year (95% CI: 0.8–1.9). Pooled risk of early moderate-to-severe TR at discharge was 9.4% (95% CI: 7.0–12.1). Late moderate-to-severe TR rate after discharge was 1.9%/year (95% CI: 1.0–3.5). Late reintervention rate was 0.3%/year (95% CI: 0.2–0.4). Mortality and overall (early and late) TR rate were comparable between suture vs. ring annuloplasty (14 studies), whereas overall TR rate was higher after flexible ring vs. rigid ring annuloplasty (6 studies) (7.5%/year vs. 3.9%/year, P = 0.002).

Conclusion
This study shows that patients undergoing surgery for functional tricuspid regurgitation (FTR) have an acceptable early and late mortality. However, TR remains prevalent after surgery. The results of this study can be used to inform patients and clinicians about the expected outcome after surgery for FTR and can results serve as a benchmark for the performance of emerging transcatheter TV interventions.
The Piranha Genome Provides Molecular Insight Associated to Its Unique Feeding Behavior
Authors: Schartl Manfred , Kneitz Susanne , Volkoff Helene , Adolfi Mateus , Schmidt Cornelia , Fischer Petra , Minx Patrick , Tomlinson Chad , Meyer Axel , Warren Wesley C 
Published: July 2019

Abstract
The piranha enjoys notoriety due to its infamous predatory behavior but much is still not understood about its evolutionary origins and the underlying molecular mechanisms for its unusual feeding biology. We sequenced and assembled the red-bellied piranha (Pygocentrus nattereri) genome to aid future phenotypic and genetic investigations. The assembled draft genome is similar to other related fishes in repeat composition and gene count. Our evaluation of genes under positive selection suggests candidates for adaptations of piranhas’ feeding behavior in neural functions, behavior, and regulation of energy metabolism. In the fasted brain, we find genes differentially expressed that are involved in lipid metabolism and appetite regulation as well as genes that may control the aggression/boldness behavior of hungry piranhas. Our first analysis of the piranha genome offers new insight and resources for the study of piranha biology and for feeding motivation and starvation in other organisms.
Analysis of geomagnetic secular variation for the last 1.5 Ma recorded by volcanic rocks of the Trans Mexican Volcanic Belt: new data from Sierra de Chichinautzin, Mexico
Authors: Rodríguez-Trejo A , Alva-Valdivia L M , Perrin M , Hervé G , López-Valdés N 
Published: July 2019

SummaryThe great wealth of volcanism along the Trans Mexican Volcanic Belt (TMVB) and the need to improve the secular variation curve of the Earth magnetic field of the region is the aim of this research. 300 oriented cores from 33 sites and 21 individual cooling units were acquired from Sierra de Chichinautzin volcanic field (ChVF) and Sierra de Santa Catarina (SSC). Directional analysis and rock magnetic experiments were performed (e.g. thermal demagnetization, hysteresis loop, susceptibility vs temperature), achieving 21 new averaged palaeomagnetic directions. New results are consistent with the previous studies on the same cooling unit. We compiled all the palaeomagnetic studies performed on the ChVF, updating age and calculating an average direction per cooling unit and estimating an overall mean direction for the ChVF (Dec = 359.1°, Inc = 35.3°, N = 33, k = 21.6, α95 = 5.5°, Plat = 87.7° N, Plong = 227.4° E, K = 31.8, A95 = 4.5°).Afterwards, we compiled all the previous palaeomagnetic studies along the whole TMVB with age ranging from 0 to 1.5 Ma, and constrained the directional analyses by specific quality criteria such as well-defined age, number of samples and quality of kappa) on the cooling unit consistency.The mean direction and virtual geomagnetic pole (VGP) estimated for the TMVB, during the periods 0–40 ka and 0–1.5 Ma, are close to the geographic pole, supporting the validity of the geocentric axial dipole hypothesis. The directional results of this study also fit well with the predictions at Mexico City of the models SHA.DIF.14k and CALS10k2 calculated for the last 14 ka. The dispersion of the VGP's on the TMVB are also consistent with the expected values proposed by different models of palaeosecular variation. However, large gaps in the temporal record remain that should be filled by further palaeomagnetic studies.
Process evaluation of a community-based diabetes prevention program in China: the Pathway to Health (PATH)
Authors: Strand Mark A , He Meizi , Johnson Ryan , Perry Judith , Yin Zenong 
Published: July 2019

Abstract
High prevalence of diabetes and prediabetes has emerged as a concern in China. The Pathway to Health Program was designed to prevent type 2 diabetes onset in prediabetic women in a north China urban community. This process evaluation of a randomized controlled trial analysed participant surveys at the 6- and 12-month assessment times, participant weekly logs, class attendance records and post-study participant focus group results. The reported levels of participant engagement in physical activity (PA)-related behaviors were higher than diet-related behaviors at the 6-month assessment. The engagement in both PA- and diet-related behaviors declined during the 6-month follow-up period. Step counts from the participants’ pedometers indicated an increase in PA in the first 6 months of the intervention. Study participants expressed high levels of satisfaction with the intervention and increased their scores on diabetes-related knowledge. Conflicts with work and family responsibilities were the main barriers for missing health lessons, likely contributing to minimal weight loss. There was good fidelity in program implementation. Intensive lifestyle modification programs are difficult to sustain once the program is complete. A more structured 6-month follow-up phase may have provided needed support to enable participants to maintain their lifestyle changes.
Patients’ preimplantation genetic testing decision-making experience: an opinion on related psychological frameworks
Authors: Pastore L M , Cordeiro Mitchell C N , Rubin L R , Nicoloro-SantaBarbara J , Genoff Garzon M C , Lobel M 
Published: July 2019

Abstract
The process of deciding whether to pursue preimplantation genetic testing (PGT) of an embryo is highly stressful for individuals and couples and has adverse emotional consequences (e.g. distress and uncertainty). PGT influences patients’ lives in both positive and negative ways and is experienced at an individual level, as a dyadic unit, as a family member and as part of the society. Here, we argue that providing a conceptual framework with which to understand the `experience of decision making’ about PGT for monogenic disease (PGT-M) testing specifically, as well as the factors contributing to `decisional distress’ and `uncertainty’ that patients endure as a result—apart from what decision they make—is crucial to optimizing patient counseling, satisfaction and outcomes in the field of ART. Derived from psychological theory, the framework proposed here identifies three categories of contributing factors to decisional distress and uncertainty in considering PGT-M; namely, ‘intraindividual’, ‘interpersonal’ and ‘situational’ factors. We reviewed evidence from the PGT literature to inform our framework. Well-accepted theories of stress and health decision making were also reviewed for their relevance to PGT-M decision making, focusing on potential distress and uncertainty. Our novel conceptual framework can be used to inform clinical practice, to advance research and to aid the development of interventions for individuals and couples who are deciding whether or not to use PGT-M. Alleviating emotional distress and uncertainty can improve patients’ well-being during their reproductive journey.
Planned right ventricular support for combined heart–liver transplantation
Authors: Barac Yaron D , McCartney Sharon L , Sudan Debra , Schroder Jacob N 
Published: July 2019

Abstract
Right ventricular dysfunction post heart transplantation (HTx) is a common problem and its likelihood to occur after combined heart–liver transplantation is even higher. The placement of an extracorporeal planned right ventricular assist device following the HTx during liver transplantation may assist in preventing this complication.
Piecewise Linear Sheaves
Authors: Kashiwara Masaki , Schapira Pierre 
Published: July 2019

Abstract
On a finite-dimensional real vector space, we give a microlocal characterization of (derived) piecewise linear sheaves (PL sheaves) and prove that the triangulated category of such sheaves is generated by sheaves associated with convex polyhedra. We then give a similar theorem for PL $\gamma $-sheaves, that is, PL sheaves associated with the $\gamma $-topology, for a closed convex polyhedral proper cone $\gamma $. Our motivation is that convex polyhedra may be considered as building blocks for higher dimensional barcodes.
Inhibition of p53 inhibitors: progress, challenges and perspectives
Authors: Sanz Gema , Singh Madhurendra , Peuget Sylvain , Selivanova Galina 
Published: July 2019

Abstract
p53 is the major tumor suppressor and the most frequently inactivated gene in cancer. p53 could be disabled either by mutations or by upstream negative regulators, including, but not limited to MDM2 and MDMX. p53 activity is required for the prevention as well as for the eradication of cancers. Restoration of p53 activity in mouse models leads to the suppression of established tumors of different origin. These findings provide a strong support to the anti-cancer strategy aimed for p53 reactivation. In this review, we summarize recent progress in the development of small molecules, which restore the tumor suppressor function of wild-type p53 and discuss their clinical advance. We discuss different aspects of p53-mediated response, which contribute to suppression of tumors, including non-canonical p53 activities, such as regulation of immune response. While targeting p53 inhibitors is a very promising approach, there are certain limitations and concerns that the intensive research and clinical evaluation of compounds will hopefully help to overcome.