bluuebunny/crossref_metadata_2025_split huggingface dataset:
An Analog Computer for Studying Heat Transfer During a Thermal Recovery Process
Authors: Vogel L.C. , Krueger R.F. 
Published: February 2020

Published in Petroleum Transactions, AIME, Volume 204, 1955, pages 205–212.

Abstract
A design is presented for an electrical analog computer which can solve non-steady state heat transfer problems in an extensive radial formation containing a moving cylindrical source. The computer is used to simulate a simplified thermal oil recovery process in which heat transfer from a moving, constant temperature source takes place radially by conduction only. Temperature distribution curves are shown for several different assumed modes of travel for the heat source. The data are used to estimate the residual fuel requirements necessary to maintain a self-propagating isothermal front for the particular system being studied.
Although the computer is designed to represent an unique system, conversion factors can be adjusted to show the effects of changing the assumed values of system constants, such as thermal conductivity of the formation and temperature of the source isotherm. Examples are given to illustrate the relative influence the assumed values of these variables will have upon the quantity of fuel required to maintain the source.
The maximum effect of heat transfer by the flowing air stream is estimated mathematically, and full requirements for this system are shown to be markedly reduced.
Inasmuch as the examples discussed refer to a simplified process, the results are not directly applicable to a practical field operation. It is believed, however, that the data illustrate some general trends which are important in thermal recovery processes.
Data from laboratory and field experimentation can be used to modify the computer to take into account the influence of heat transfer by various mechanisms, for example, by injected air and by fluids ahead of the hot zone. With such refinements it would be possible to estimate more accurately the limiting values for the rate of travel of the high temperature front and for the required air injection rates.
Use of this computer should aid in evaluating the economic feasibility of oil recovery by various thermal processes. It is hoped this paper will stimulate further work by others to help accomplish this objective.
Estimating Size and Shape of Vertical and Horizontal Fractures
Authors: Crawford Paul B. , England A.C. , Landrum Bobby L. , Haney William F. 
Published: February 2020

Published in Petroleum Transactions, AIME, Volume 204, 1955, pages 175–181.

Abstract
The creation of unsymmetrical vertical or horizontal fractures in a producing well will result in a unique distortion of the normal shut-in pressures existing at the four surrounding wells. An electrical model study has been made to show how the shut-in pressures at the wells surrounding the fractured producing well may be used to estimate the size and orientation of vertical or horizontal fractures. The pressure differences at the four surrounding wells are recorded during production from the fractured well. The resulting pressure data are matched from a table of several hundred possible fracture combinations. The table refers to the figure showing the effective size and orientation of the commercially created fracture.

Introduction
The creation of commercial fractures about oil and gas wells has led to considerable speculation as to the size and shape of the fractures. It is important that the size and shape be known in certain instances, especially when pressure maintenance programs are to be initiated. It was shown that if knowledge of a vertical fracture could be found that such information may be utilized in planning a waterflooding or gas cycling program and that in some cases the fractures might be utilized very effectively. Other work showed that it may be desirable to create "pancake" fractures in certain reservoirs but that they should exist in a desirable range: If the fractures are too large, they should be plugged prior to initiating a pressure maintenance program. If an irregular shaped "pancake" fracture is created, it is desirable to know the orientation of this fracture because similar but unreported studies have shown that "pancake" fractures mayor may not substantially affect the sweep efficiencies and performance of the flooding or cycling program. Consequently, it may be desirable in some instances to estimate the effective size and orientation of the fracture.
A Device for Determining the Concentration of Formation Treating Acids
Authors: Huitt J.L. 
Published: February 2020

Published in Petroleum Transactions, AIME, Volume 204, 1955, pages 273–274.
Some of the problems associated with the acid treatment of oil wells are related to the control of the composition of formation treating acid. One test usually made at the well site is the determination of the acid concentration. Heretofore, the concentration of the acid delivered to the well site usually has been interpreted from a hydrometer measurement of the specific gravity of the acid solution. Experience has shown that this indirect measurement of acid concentration can give erroneous results. More reliable results are, of course, obtainable by the titration method; however, this method is not easily adapted to well-site testing.
To overcome these objections, a device was developed for use in the field which permits determination of the concentration of treating acid both quickly and accurately at the time of the acid treatment. Its purpose was three-fold, namely, to determine:the concentration of the fresh treating acid,the concentration of the spent acid returning from the well, andthe solubility of formation samples in treating acid.
The device was designed to operate on the principle of the stoichiometric relation between the calcium carbonate-hydrochloric acid reaction and the carbon dioxide gas resulting from the reaction. By confining the carbon dioxide gas within a reaction cell of the type shown in Fig. 1, the pressure inside the cell is increased. Since the pressure is an indication of the quantity of carbon dioxide gas produced, it may be used to estimate the concentration of the acid, provided an excess of calcium carbonate is used. From information on the volume of the reaction cell, the volume of acid used, and the pressure and temperature of the gas after the completion of the reaction, the concentration of the treating acid may be computed.
The reaction cell is essentially a pressure vessel equipped with a pressure gage, temperature indicator, pressure release valve, and a special sample holder. Plastic and metal construction makes the cell both rugged and acid-resistant.
Role of the initial degree of anaemia and treatment model in the prognosis of gastric cancer patients treated by chemotherapy: a retrospective analysis
Authors: Li Wenhuan , Zhang Ji-Yu , Liu Wen-Hui , Chen Xian-Xian 
Published: February 2020

Abstract
Background ：Anaemia is highly prevalent in gastric cancer (GC) patients. The role of initial haemoglobin levels in predicting the prognosis of GC patients treated by chemotherapy has not been well determined. Our present study aims to evaluate the relationship between the degree of anaemia and the overall survival (OS) and progression-free survival (PFS) of patients with GC.
Methods: Our retrospective study enrolled 598 patients who were treated with chemotherapy when the recurrent or metastatic GCs were unsuitable for surgical resection. Univariate and multivariate analyses were performed to identify risk factors that had the potential to affect patient prognosis. Additionally, the relationship between clinicopathological characteristics, including treatment method, and degree of cancer related reduction in haemoglobin was further analysed.
Results : Our results revealed that patients with HB ini level ≤ 80 g/L had a trend toward a shortened median OS and PFS ( p =0.009 and p =0.049, respectively). Interestingly, we also found that HB dec ≥30 g/L was associated with a significantly shortened median OS and PFS ( p =0.039 and p =0.001, respectively). Multivariate analysis showed that HB ini levels ≤80 g/L could be used as an independent prognostic factor for recurrent and metastatic GC. More importantly, HB dec ≥30 g/L and treatment response were also significantly associated with OS and PFS. Furthermore, the degree of haemoglobin decrease was associated with chemotherapy including platinum and the number of chemotherapy cycles.
Conclusion : Our study concludes that the initial degree of anaemia and a decrease in haemoglobin of ≥ 30 g/L can serve as biomarkers to predict prognosis in recurrent or metastatic GC patients, while chemotherapy treatment rather than red blood cell (RBC) transfusion can improve their prognosis. Additionally, platinum should not be recommended for treating severely anaemic GC patients.
A Novel Risk Model for Mortality and Hospitalization following Cardiac Resynchronization Therapy in Patients with Non-ischemic Cardiomyopathy: The Alpha-score
Authors: Yang Shengwen , Liu Zhimin , Hu Yiran , Jing Ran , Gu Min , Niu Hongxia , Ding Ligang , Xing Anlu , Zhang Shu , Hua Wei 
Published: February 2020

Abstract
Background: Non-ischemic cardiomyopathy (NICM) has been associated with a better left ventricle reverse remodeling response and improved clinical outcomes after cardiac resynchronization therapy (CRT). The aims of our study were to identify the predictors of mortality and heart failure hospitalization in patients treated with CRT and design a risk score for prognosis. Methods: A cohort of 422 consecutive NICM patients with CRT was retrospectively enrolled between January 2010 and December 2017. The primary endpoint was all-cause mortality and heart transplantation. Results: In a multivariate analysis, the predictors of all-cause death were left atrial diameter [Hazard ratio (HR): 1.056, 95% confidence interval (CI): 1.020-1.093, P=0.002]; non-left bundle branch block [HR: 1.793, 95% CI: 1.131-2.844, P =0.013]; high sensitivity C-reactive protein [HR: 1.081, 95% CI: 1.029-1.134 P= 0.002]; and N-terminal pro-B-type natriuretic peptide [HR: 1.018, 95% CI: 1.007-1.030, P =0.002]; and New York Heart Association class IV [HR: 1.018, 95% CI: 1.007-1.030, P =0.002]. The Alpha-score ( A trial diameter, non- L BBB, P ro-BNP, H s-CRP, NYH A class IV) was derived from each independent risk factor. The novel score had good calibration (Hosmer-Lemeshow, P >0.05) and discrimination for both primary endpoints [c-statistics: 0.749 (95% CI: 0.694-0.804), P <0.001] or heart failure hospitalization [c-statistics: 0.692 (95% CI: 0.639-0.745), P <0.001]. Conclusion: The Alpha-score may enable improved discrimination and accurate prediction of long-term outcomes among NICM patients with CRT.
Impact of weight trajectory after bariatric surgery on co-morbidity evolution and burden
Authors: Davis Jason , Saunders Rhodri 
Published: February 2020

Abstract
Background
Bariatric surgery, such as Roux-en-Y gastric bypass [RYGB] has been shown to be an effective intervention for weight management in select patients. After surgery, different patients respond differently even to the same surgery and have differing weight-change trajectories . The present analysis explores how improving a patient’s post-surgical weight change could impact co‑morbidity prevalence, treatment and associated costs in the Canadian setting.
Methods
Published data were used to derive statistical models to predict weight loss and co‑morbidity evolution after RYGB. Burden in the form of patient-years of co-morbidity treatment and associated costs was estimated for a 100-patient cohort on one of 6 weight trajectories, and for real-world simulations of mixed patient cohorts where patients experience multiple weight loss outcomes over a 10-year time horizon after RYGB surgery. Costs (2018 Canadian dollars) were considered from the Canadian public payer perspective for diabetes, hypertension and dyslipidaemia. Robustness of results was assessed using probabilistic sensitivity analyses using the R language.
Results
Models fitted to patient data for total weight loss and co-morbidity evolution (resolution and new onset) demonstrated good fitting. Improvement of 100 patients from the worst to the best weight loss trajectory was associated with a 50% reduction in 10-year co-morbidity treatment costs, decreasing to a 27% reduction for an intermediate improvement. Results applied to mixed trajectory cohorts revealed that broad improvements by one trajectory group for all patients were associated with 602, 1,710 and 966 patient-years of treatment of type 2 diabetes, hypertension and dyslipidaemia respectively in Ontario, the province of highest RYGB volume, corresponding to a cost difference of $3.9 million.
Conclusions
Post-surgical weight trajectory, even for patients receiving the same surgery, can have a considerable impact on subsequent co-morbidity burden. Given the potential for alleviated burden associated with improving patient trajectory after RYGB, health care systems may wish to consider investments based on local needs and available resources to ensure that more patients achieve a good long-term weight trajectory.
First referral to an Integrated Onco-Palliative Care program: a retrospective analysis of its timing
Authors: Barth Claire , Colombet Isabelle , Montheil Vincent , Huillard Olivier , Boudou-Rouquette Pascaline , Tlemsani Camille , Alexandre Jérôme , Goldwasser François , Vinant Pascale 
Published: February 2020

Abstract
Background: Palliative care (PC) referral is recommended early in the course of advanced cancer. This study aims to describe, in an integrated onco-palliative care program (IOPC), patient’s profile when first referred to this program, timing of this referral and its impact on the trajectory of care at end-of-life. Patients and Methods: The IOPC combined the weekly onco-palliative meeting (OPM) dedicated to patients with incurable cancer, and/or the clinical evaluation by the PC team. Oncologists can refer to the multidisciplinary board of the OPM the patients for whom goals and organization of care need to be discussed. We analyzed all patients first referred at OPM in 2011-2013. We defined the index of precocity (IP), as the ratio of the time from first referral to death by the time from diagnosis of incurability to death, ranging from 0 (late referral) to 1 (early referral). Results: Of the 416 patients included, 57% presented with lung, urothelial cancers, or sarcoma. At first referral to IOPC, 76% were receiving antitumoral treatment, 63% were outpatients, 56% had a performance status ≤2 and 46% had a serum albumin level >35g/l. The median [1st-3rd quartile] IP was 0.39 [0.16-0.72], ranging between 0.53 [0.20-0.79] (earliest referral, i.e. close to diagnosis of incurability, for lung cancer) to 0.16 [0.07-0.56] (latest referral, i.e. close to death relatively to length of metastatic disease, for prostate cancer). Among 367 decedents, 42 (13%) received antitumoral treatment within 14 days before death, and 157 (43%) died in PC units.Conclusions: The IOPC is an effective organization to enable early integration of PC and decrease aggressiveness of care near the end-of life. The IP is a useful tool to model the timing of referral to IOPC, while taking into account each cancer types and therapeutic advances.
Multiple association analysis of loci and candidate genes that regulate body size at three growth stages in Simmental beef cattle
Authors: An Bingxing , Xu Lei , Xia Jiangwei , Wang Xiaoqiao , Miao Jian , Chang Tianpeng , Song Meihua , Ni JunQing , Xu Lingyang , Zhang Lupei , Li Junya , Gao Huijiang 
Published: February 2020

Abstract
Background: Body size traits as one of the main breeding selection criteria was widely used to monitor cattle growth and to evaluate the selection response. In this study, body size was defined as body height (BH), body length (BL), hip height (HH), heart size (HS), abdominal size (AS), and cannon bone size (CS). We performed genome-wide association studies (GWAS) of these traits over the course of three growth stages (6, 12 and 18 months after birth) using three statistical models, single-trait GWAS, multi-trait GWAS and LONG-GWAS. The Illumina Bovine HD 770K BeadChip was used to identify genomic single nucleotide polymorphisms (SNPs) in 1217 individuals. Results: In total, 19, 29, and 10 significant SNPs were identified by the three models, respectively. Among these, 21 genes were promising candidate genes, including SOX2, SNRPD1, RASGEF1B, EFNA5, PTBP1, SNX9, SV2C, PKDCC, SYNDIG1, AKR1E2, and PRIM2 identified by single-trait analysis; SLC37A1, LAP3, PCDH7, MANEA, and LHCGR identified by multi-trait analysis; and P2RY1, MPZL1, LINGO2, CMIP, and WSCD1 identified by LONG-GWAS. Conclusions: Multiple association analysis was performed for six growth traits at each growth stage. These findings offer valuable insights for the further investigation of potential genetic mechanism of growth traits in Simmental beef cattle.
Transcriptome profiling of developing testes and spermatogenesis in the Mongolian horse
Authors: LI Bei , He Xiaolong , Zhao Yiping , Bai Dongyi , Du Ming , Song Lianjie , Liu Zhuang , Yin Zhenchen , Manglai Dugarjaviin 
Published: February 2020

Abstract
Background: Horse testis development and spermatogenesis are complex physiological processes. Methods: To study these processes, three immature and three mature testes were collected from the Mongolian horse, and six libraries were established using high-throughput RNA sequencing technology (RNA-Seq) to screen for genes related to testis development and spermatogenesis. Results: A total of 16,237 upregulated genes and 8,641 downregulated genes were detected in the testis of the Mongolian horse. These genes play important roles in different developmental stages of spermatogenesis and testicular development. Five genes with alternative splicing events that may influence spermatogenesis and development of the testis were detected. GO (Gene ontology) and KEGG (Kyoto Encyclopedia of Genes and Genomes) pathway analyses were performed for functional annotation of the differentially expressed genes. Pathways related to “spermatogenesis,” male gamete generation,” “spermatid development” and “oocyte meiosis” were significantly involved in different stages of testis development and spermatogenesis. Conclusion: Genes, pathways and alternative splicing events were identified with inferred functions in the process of spermatogenesis in the Mongolian horse. The identification of these differentially expressed genetic signatures improves our understanding of horse testis development and spermatogenesis.
Serum Levels of Neutrophil Gelatinase Associated Lipocalin (NGAL) Predicts Hemodialysis After Coronary Angiography in High Risk Patients with Acute Coronary Syndrome.
Authors: Reyes Luis Felipe , Severiche-Bueno Diego Fernando , Bustamante Carlos A. , Murillo Sixta , Soni Nilam J. , Poveda Marcela , Gomez Efrain , Buitrago Ricardo , Rodriguez Alejandro 
Published: February 2020

Abstract
Aim: To determine the association of serum, Neutrophil Gelatinase Associated Lipocalin (NGAL) levels and, the need for hemodialysis after a percutaneous coronary intervention (PCI). Design: This is a prospective, observational study.Setting: A cardiovascular and University referral hospital.Patients: Patients with Acute Coronary Syndrome (ACS) that underwent PCI during two consecutive years were enrolled in our study. Main variables of interest: NGAL levels were measured using ELISA. Blood samples were obtained within the first 6 hours of hospital admission, and 12 and 24 hours after contrast exposure from angiography. The primary outcome was the requirement of hemodialysis. The non-parametric Mann-Whitney U test was used to test for differences in median serum levels of NGAL. A receiver operating characteristic (ROC) curve was developed to assess the accuracy of NGAL to predict the need for hemodialysis after PCI.Results: A total of 2,875 were screened; however, 45 patients with ACS that underwent PCI were included. All patients were at high risk of developing Contrast-induced nephropathy (CIN) defined by Mehran score >11 points. The median (IQR) serum concentration of NGAL was significantly higher in patients that required versus did not require hemodialysis (340 [83-384] vs. 169 [100-210], p=0.01). Elevated serum levels of NGAL predicted the need for hemodialysis with an area under the curve of 0.86 (95% CI: 0.66-1.00).Conclusions: In patients with ACS undergoing PCI; and high risk of developing CIN, an elevated serum level of NGAL 6 hours after contrast exposure predicts the development of acute kidney injury requiring hemodialysis.
NT-4 attenuates neuroinflammation via TrkB/PI3K/FoxO1 pathway after germinal matrix hemorrhage in neonatal rats
Authors: Wang Tianyi , Zhang Junyi , Li Peng , Ding Yan , Tang Jiping , Chen Gang , Zhang John 
Published: February 2020

Abstract
Background: Neuroinflammation plays an important role in pathogenesis of germinal matrix hemorrhage (GMH). Neurotrophin-4 (NT-4) is a member of the neurotrophin family, and it interacts with the tyrosine kinase B (TrkB) receptor. It has been studied that NT-4 has neuroprotective effects following cerebral ischemia. We aimed to investigate the neuroprotective function of NT-4 and it’s high affinity receptor TrkB as well as its downstream mediator phosphatidylinositol-3-kinases (PI3K)/protein kinase B (Akt)/Forkhead box protein O1 (FoxO1) following GMH in neonatal rats, with a specific focus on inflammation. Methods: GMH was induced by intraparenchymal injection of bacterial collagenase (0.3U) in P7 rat pups. A total of 163 seven-day-old pups were used in this study. The recombinant human NT-4 was administered intranasally at 1 hour after the collagenase injection. The selective TrkB antagonist ANA-12, selective PI3K inhibitor LY294002 and FoxO1 activating CRISPR were administered intracerebroventricularly at 24 hours prior to NT-4 treatment to investigate the potential mechanism. Short-and-long-term neurobehavior assessments, immunofluorescence staining, Nissl’s staining and Western blot were performed. Results ： The expression of p-TrkB increased after GMH with a peak at day3. The TrkB receptor was expressed by neurons, microglia, and astrocytes. The administration of rh-NT-4 increased phosphorylation of TrkB, expression of PI3K, phosphorylation of Akt and decreased FoxO1, IL-1beta and IL-6 levels. Selective inhibition of TrkB/PI3K/Akt signaling in microglia increased the expression levels of FoxO1 and pro-inflammatory cytokines. The use of FoxO1 activation CRISPR increased the expression of IL-6, suggesting that FoxO1 might potentially induce pro-inflammatory factors. These results demonstrated that PI3K/Akt/FoxO1 may be the downstream pathway of TrkB phosphorylation. The rat pups treated with rh-NT-4 performed better than untreated animals both in short-and-long-term behavior test. Conclusion： These data showed that rh-NT-4 can reduce the expression of pro-inflammatory cytokines, improve neurological function, attenuate neuroinflammation and post-hemorrhagic hydrocephalus after GMH by promoting TrkB/PI3K/Akt/FoxO1 pathway. These results indicated that rh-NT-4 could be a promising therapeutic target to ameliorate neuroinflammation and hydrocephalus after GMH or other similar brain injuries.