bluuebunny/crossref_metadata_2025 huggingface dataset:
Psychosoziale Risikofaktoren in einer personalisierten kardiologischen Prävention
Authors: Ladwig Karl-Heinz , Lukaschek Karoline
Published: May 2021

Herzerkrankungen stehen bei der Prävention im Fokus: Sie sind die häufigste Todesursache und ihr Verlauf lässt sich präventiv beeinflussen. Vor Eintritt der Herzerkrankung können durch präventives Handeln viele Erkrankungen verhindert werden – ein Ziel, das von vielen geteilt, aber nur selten praktisch umgesetzt wird. Die Evidenz zu psychosozialen Faktoren kann für eine personalisierte Medizin in der präventiven Herzmedizin genutzt werden.
Klinische Psychokardiologie am Allgemeinkrankenhaus
Authors: Puy Constantin , Heinisch Susanne , Prondzinsky Roland
Published: May 2021

Die psychosomatische Medizin versteht sich als eine interdisziplinäre und ganzheitliche medizinische Disziplin. Dennoch wird häufig in Kliniken und Krankenhäusern die Trennung von somatischer und psychosomatischer Medizin gelebt. Die schrittweise Umsetzung eines integrativen Ansatzes psychosomatischer Medizin an einem Allgemeinkrankenhaus im südlichen Sachsen-Anhalt soll der folgende Artikel skizzieren.
Fallbericht Magersucht und Depression
Authors: Kuhnen Sabine , Hartung Cornelia , Hartkamp Norbert , Foertsch Dörte
Published: May 2021

Eine Studentin leidet unter Essstörungen und einer depressiven Krise. Diese werden ausgelöst durch soziale Konflikte in der Partnerschaft, der Familie und am Arbeitsplatz. Ihr Selbstbild ist geprägt von ihrem familiären und schulischen Umfeld in der Kindheit und Jugend.
Psychokardiologie: Aktuelle Leitlinien und Versorgungspraxis
Authors: Herrmann-Lingen Christoph
Published: May 2021

Die Erkenntnisse der psychokardiologischen Forschung sind in den letzten 20 Jahren verstärkt in medizinische Leitlinien einbezogen worden und haben zu wichtigen Weiterentwicklungen in der Patientenversorgung geführt. Diese sind allerdings noch nicht flächendeckend implementiert. Ausgehend von einem Patientenbeispiel werden im Folgenden Empfehlungen ausgewählter Leitlinien und Positionspapiere zur psychokardiologischen Behandlung dargestellt.
Safety and efficacy of EUS-guided pancreatic duct drainage in symptomatic main pancreatic duct obstruction: Is there still a place for surgery?
Authors: Falque Arthur , Gasmi Mohamed , Barthet Marc , Gonzalez Jean-Michel
Published: May 2021

Background and study aims In patients with symptomatic dilation of the main pancreatic duct (MPD) for whom endoscopic retrograde cholangiopancreatography (ERCP) is impossible, surgery has long been the only available treatment. EUS-PD is described as a minimally invasive alternative for ductal decompression surgery. We describe the results of our experience with it.

Patients and methods This was a retrospective single-center study over 9 years. Twenty-seven patients, median age 61.8 years (range 36 to 85) who underwent EUS-PD for symptomatic MPD dilatation were included. The main objective was to evaluate the technical success (placement of a plastic stent between the stomach and the MPD). Secondary objectives were to document clinical success based on pain and quality of life (visual analogic scales and treatments) and complication rates, and to define a standardized management algorithm.

Results The technical success rate was 92.5 %. The rate of minor adverse events was 21 % (4 cases of non-specific postoperative pain and two cases of delayed benign edematous pancreatitis). The clinical success rate was 88 %, and half of patients in whom the procedure was successful had "complete regression" of pain and half "partial regression." Median follow-up was 34.2 months (range 4 to 108). During follow-up, 74 % of patients reported improvement in quality of life and no patients required secondary surgery.

Conclusion Provided it is performed in an expert center, EUS-PD is a minimally invasive, effective, and safe alternative to pancreatic surgical drainage in patients with symptomatic MPD dilatation with failure or in whom ERCP is impossible.
Use of ambient lighting during colonoscopy and its effect on adenoma detection rate and eye fatigue: results of a pilot study
Authors: Hoff Ryan T. , Mazulis Andrew , Doniparthi Meghana , Munis Assad , Rivelli Anne , Lakha Asif , Ehrenpreis Eli
Published: May 2021

Background and study aims Adenoma detection rate (ADR) appears to decrease as the number of consecutive hours performing procedures increases, and eye strain may be a contributing factor. Ambient light may improve symptoms of eye strain, but its effects have yet to be explored in the field of gastroenterology. We aim to determine if using ambient lighting during screening colonoscopy will maintain ADRs and improve eye strain symptoms compared with low lighting.

Methods At a single center, retrospective data were collected on colonoscopies performed under low lighting and compared to prospective data collected on colonoscopies with ambient lighting. Eye fatigue surveys were completed by gastroenterologists. Satisfaction surveys were completed by physicians and staff.

Results Of 498 low light and 611 ambient light cases, 172 and 220 adenomas were detected, respectively (P = 0.611). Under low lighting, the ADR decreased 5.6 % from first to last case of the day (P = 0.2658). With ambient lighting, the ADR increased by 2.80 % (P = 0.5445). The difference in the overall change in ADR between first and last cases with ambient light versus low light was statistically significant (8.40 % total unit change, P = 0.01). The average eye strain scores were 8.12 with low light, and 5.63 with ambient light (P = 0.3341).

Conclusions Performing screening colonoscopies with ambient light may improve the differential change in ADR that occurs from the beginning to the end of the day. This improvement in ADR may be related to improvement in operator fatigue. The effect of ambient light on eye strain is unclear. Further investigation is warranted on the impact of ambient light on symptoms of eye strain and ADR.
Endoscopic ultrasound-guided gastroenterostomy using large-diameter (20 mm) lumen apposing metal stent (LLAMS)
Authors: Sobani Zain A. , Paleti Swathi , Rustagi Tarun
Published: May 2021

Background and study aims Endoscopic ultrasound-guided gastroenterostomy (EUS-GE) using a 15-mm lumen apposing metal stent (LAMS) has emerged as a viable alternative to surgical gastrojejunostomy for management of gastric outlet obstruction (GOO). However, given the size of the anastomosis created with a 15-mm LAMS, long-term luminal patency and clinical outcomes may be suboptimal. The aim of this study was to evaluate the technical feasibility, efficacy, and safety of EUS-GE with a large-diameter (20 mm) LAMS (LLAMS).

Patients and methods A retrospective analysis of a prospectively maintained database of all patients undergoing EUS-GE with LLAMS between December 1, 2018 and September 30, 2020 was performed. All EUS-GEs were performed using a cautery-enhanced LLAMS.

Results Thirty-three patients were referred for endoscopic management of GOO. Two patients were excluded due to a lack of an adequate window for EUS-GE. The remaining 31 patients (93.94 %) (mean age: 61.35 ± 16.52 years; 54.84 % males) underwent EUS-GE using LLAMS for malignant (n = 23) and benign (n = 8) GOO. Technical success was achieved in all patients (100 %) with attempted EUS-GE. Complete clinical success (tolerance of regular diet) was achieved in 93.55 % of patients (n = 29). Two patients (6.45 %) had partial clinical success and died of unrelated causes prior to advancing diet beyond full liquids. Overall mean follow-up was 140.84 ± 160.41 days (median 70, range 4–590). All stents remained patent with no evidence of recurrent GOO symptoms. One patient (3.23 %) developed an asymptomatic clean-based jejunal ulcer on 3-month follow-up endoscopy.

Conclusions EUS-GE with LLAMS is a technically feasible, effective and safe option for patients with GOO allowing for tolerability of regular diet. Future prospective, ideally randomized studies comparing long-term outcomes of EUS-GE with 20- and 15-mm LAMS are required.
Protecting-Group-Free Synthesis of GB1107: An Orally Active Galectin-3 Antagonist
Authors: Giguère Denis , St-Gelais Jacob
Published: May 2021

Small-molecule galectin inhibitors are useful research tools that could also be used as potential drug candidates. In that context, GB1107, a monosaccharidic galectin inhibitor, was shown to be an orally active galectin-3 antagonist that inhibits lung adenocarcinoma growth. Herein, a protecting-group-free synthesis of GB1107, along with other analogues is described. Starting from inexpensive levoglucosan, a Payne rearrangement/azidation process was used as key step. Finally, the use of a log P determination method based on 19F NMR spectroscopy was explored to assess the lipophilicity of galectin inhibitors.
Catalytic Reductive Cleavage of Poly(phenylene sulfide) Using a Hydrosilane
Authors: Minami Yasunori , Nakajima Yumiko , Matsuyama Nao , Matsuo Yasuaki , Tamura Masanori , Sato Kazuhiko
Published: May 2021

The solvent-insoluble poly(phenylene sulfide) main chain was reductively cleaved by using triethylsilane as a hydrogen source under palladium/IcHex catalytic conditions. After the reaction, benzene and bis(triethylsilyl) sulfide as a sulfide source were formed efficiently. This method could be operated on a gram scale.
Effect of Modeling Resins on Microhardness of Resin Composites
Authors: Bayraktar Ezgi T. , Atali Pinar Y. , Korkut Bora , Kesimli Ezgi G. , Tarcin Bilge , Turkmen Cafer
Published: May 2021

Objectives This study was aimed to determine the effects of modeling resins on the surface microhardness of composites.

Materials and Methods Six resin-based composites (Charisma Smart, Estellite Asteria, CeramX-One SphereTEC, Admira Fusion, Filtek Ultimate, and Clearfil Majesty Es-2) and three wetting agents (Modeling Liquid, Composite Primer, and Modeling Resin) were investigated. In all, 240 specimens were prepared, and wetting agents were applied prior to light curing in the experimental groups. After 24 hours, specimens were polished and Vickers microhardness (VHN) values were measured.

Statistical Analysis Shapiro–Wilk and two-way analysis of variance (ANOVA) were used for analyses (p < 0.05).

Results Both modeling resin and composites were determined to be effective factors (p < 0.001). The control group showed the highest VHN (70.37 ± 7.94), followed by Modeling Liquid (64.68 ± 12.07), Composite Primer (59.84 ± 6.33), and Modeling Resin (58 ± 3.52b; p < 0.001). Filtek Ultimate showed the highest VHN (76.62 ± 9.78c), whereas Charisma Smart (58.87 ± 7.95), and Clearfil Majesty (67.27 ± 2.58) showed the lowest (p < 0.001). Clearfil Majesty–Modeling Liquid (46.62 ± 5.33) and Charisma Smart–Composite Primer (50.81 ± 0.39) combinations showed the lowest VHN, whereas Filtek Ultimate–control (87.15 ± 2.12) and Filtek Ultimate–Modeling Liquid (84.24 ± 3.11) showed the highest (p < 0.001).

Conclusion All tested modeling resins decreased VHN value, and the amount of reduction varied among composites and wetting agents. It might be safer not to use wetting agents unless they are necessary.
Interaction between TCF7L2 rs7903146 Genotype, HbA1c Levels, and the Periodontal Status of Dental Patients
Authors: Grigoriadis Andreas , Koutounidou Symela , Räisänen Ismo , Arsenakis Minas , Sakellari Dimitra
Published: May 2021

Objective The aim of the study was to investigate the potential interaction between TCF7L2 rs7903146 genotype, which is implicated for type-2 diabetes mellitus genetic susceptibility, HbA1c levels, and the periodontal status of dental patients.

Materials and Methods HbA1c levels, clinical periodontal parameters (probing depth, clinical attachment level, bleeding on probing, and plaque index), and several parameters (such as body mass index [BMI], smoking habits, education level, and age) were recorded in 150 patients who fulfilled the criteria for screening for prediabetes/diabetes of the Centers for Disease Control and Prevention. DNA was extracted and the TCF7L2 single nucleotide polymorphism (SNP) rs7903146 was genotyped in all participants.

Results Thirty-one patients out of 150 tested were found with unknown hyperglycemia (20.7%). Regarding sex, education, parent with diabetes, normal BMI, smoking, age ≥45 years and prior testing for diabetes, no differences were observed between patients displaying HbA1c < 5.7 and ≥ 5.7% (Pearson’s Chi-square test, p > 0.05). Regarding periodontal parameters and differences between subgroups (HbA1c levels ≥ 5.7 and HbA1c levels < 5.7), statistically significant differences were observed for probing depth (3.20 ± 0.94 vs. 2.81 ± 0.78 mm), clinical attachment level (3.54 ± 1.20 vs. 3.18 ± 1.06 mm) and bleeding on probing (0.62 ± 0.25 vs. 0.50 ± 0.24%) with hyperglycemic patients exhibiting worse periodontal conditions (Mann–Whitney test p < 0.05). The allelic and genotype frequencies for the transcription factor 7-like 2 (TCF7L2) gene, SNPs 7903146 did not exhibit a significant difference between the HbA1c > 5.7 and HbA1c < 5.7 groups and the periodontitis and nonperiodontitis subgroups respectively (Fisher’s exact test >0.05). Statistical Analysis Patient characteristics and their association with prediabetes were tested by Pearson’s Chi-square test (asymptotic, two sided). Differences of periodontal parameters between subgroups were tested with the Mann–Whitney U-test. The associations of allele and genotype frequencies in the patient and control groups were analyzed using the Fisher’s exact test of independence.The significance level was set at the 0.05 for all tests.

Conclusion A statistically significant association between TCF7L2 rs7903146 genotype and periodontal condition or HbA1c levels was not observed in contrast to statistically significant differences of clinical parameters of periodontitis in patients with hyperglycemia.
Understanding the origin of similar spiking and bursting patterns in neurons and Josephson junctions
Authors: McConnon Aili
Published: May 2021

Similarities in the oscillations of neurons and Josephson junctions paves the way for superconducting nanowires and research into future artificial brain networks.
Emerging van der Waals ferroelectrics: Unique properties and novel devices
Authors: Xue Fei , He Jr-Hau , Zhang Xixiang
Published: May 2021

The past few decades have witnessed extensive and intensive studies on ferroelectric materials with switchable electric polarization due to their broad device applications. Emerging van der Waals (vdW) layered ferroelectrics ingeniously assemble strong covalent-bonded polar or non-polar monolayers through weak vdW forces. These atom arrangements contrast with the stacking of conventional oxide ferroelectrics, enabling unprecedented ferroelectric physics in terms of polarization origin, polar stabilization, and switching kinetics. Combined with other inherent optical and electrical features, the vdW ferroelectrics can undoubtedly provide a new, versatile platform for advancing fundamental physics and revolutionizing device technology. In this review, we summarize the unique ferroelectric properties in experimentally confirmed vdW ferroelectrics, particularly those properties that expand our understanding of ferroelectric switching. We also elucidate how some of these properties can intrinsically reduce depolarized instability at the atomic limit. Finally, we discuss innovative devices enabled by distinct properties of vdW ferroelectrics for electronic, optoelectronic, and energy-harvesting applications, and highlight possible future research lines.
Bulk acoustic wave transformer based on the combination of the high-ε epitaxial PbTiO3 and low-ε ScAlN thin films
Authors: Kinoshita Sarina , Yanagitani Takahiko
Published: May 2021

A rectifier antenna (called a rectenna) is useful for wireless power charging of electronic devices. To enhance the rectifier efficiency, we propose sub-GHz bulk acoustic wave (BAW) piezoelectric transformers based on the combination of high and low dielectric constant (ε) thin films. The input layers are sputter-epitaxial lead titanate (PbTiO3) films, which possess both high electromechanical coupling coefficient kt and high ε, and the output layers are ScAlN films with high kt but low ε. The voltage gain of 12.3 in 50 MHz ranges and 40.9 in 400 MHz ranges was experimentally observed in the thickness-extensional mode BAW transformer. The experimental results are in good agreement with the theoretical predictions of the electromechanical transmission line model. The BAW transformer is promising for a high voltage gain transformer for wireless power transfer.
Photo-cycloreversion mechanism in diarylethenes revisited: A multireference quantum-chemical study at the ODM2/MRCI level
Authors: Jankowska J. , Martyka M. , Michalski M.
Published: May 2021

Photoswitchable diarylethenes (DAEs), over years of intense fundamental and applied research, have been established among the most commonly chosen molecular photoswitches, often employed as controlling units in molecular devices and smart materials. At the same time, providing reliable explanation for their photophysical behavior, especially the mechanism of the photo-cycloreversion transformation, turned out to be a highly challenging task. Herein, we investigate this mechanism in detail by means of multireference semi-empirical quantum chemistry calculations, allowing, for the first time, for a balanced treatment of the static and dynamic correlation effects, both playing a crucial role in DAE photochemistry. In the course of our study, we find the second singlet excited state of double electronic-excitation character to be the key to understanding the nature of the photo-cycloreversion transformation in DAE molecular photoswitches.
Collective states and charge density waves in the group IV transition metal trichalcogenides
Authors: Randle M. D. , Lipatov A. , Mansaray I. , Han J. E. , Sinitskii A. , Bird J. P.
Published: May 2021

It has been nearly a century since the original mechanism for charge density wave (CDW) formation was suggested by Peierls. Since then, the term has come to describe several related concepts in condensed matter physics, having their origin in either the electron–phonon or electron–electron interaction. The vast majority of CDW literature deals with systems that are metallic, where discussions of mechanisms related to the Fermi surface are valid. Recently, it has been suggested that semiconducting systems such as TiS3 and TiSe2 exhibit behavior related to CDWs. In such cases, the origin of the behavior is more subtle and intimately tied to electron–electron interactions. We introduce the different classifications of CDW systems that have been proposed and discuss work on the group IV transition metal trichalcogenides (TMTs) (ZrTe3, HfTe3, TiTe3, and TiS3), which are an exciting and emergent material system whose members exhibit quasi-one-dimensional properties. TMTs are van der Waals materials and can be readily studied in the few-layer limit, opening new avenues to manipulating collective states. We emphasize the semiconducting compound TiS3 and suggest how it can be classified based on available data. Although we can conjecture on the origin of the CDW in TiS3, further measurements are required to properly characterize it.
Plutella xylostella (diamondback moth).
Authors: Sarfraz Rana M.
Published: May 2021

The diamondback moth (DBM) is one of the most studied insect pests in the world, yet it is among the 'leaders' of the most difficult pests to control. It was the first crop insect reported to develop resistance to microbial Bacillus thuringiensis insecticides, and has shown resistance to almost every insecticide, including the most recent groups such as diamide. DBM is a highly invasive species. It may have its origin in Europe, South Africa or East Asia, but is now present wherever its cruciferous hosts exist and is considered to be the most universally distributed Lepidoptera. It is highly migratory and wind-borne adults can travel long distances to invade crops in other regions, countries and continents. Immature stages also hitchhike on plant parts and can establish in new areas. DBM costs the global economy an estimated US$4 -5 billion annually, but its impacts on local biodiversity and habitats in exotic ranges are unknown.
Information Support Strategic Management Processes Environmental Policy of Cities
Authors: Turkov S L
Published: May 2021

In the report presents some methodological and applied issues of information support for strategic management processes environmental policy of cities, which, within the framework of the National concept of sustainable development of Russia (1996) relate to the lowest level of its system organization. The purpose and the main direction of using the results is the development of “human-machine” planning systems (or support) for optimal management decisions for regional and local structures of environmental management. The research methodology based on the new paradigm of system representation of the world, the theory of “noosphere” by P. T. de Chardin, E. Le Roy (1927), V. I. Vernadsky (1933), a “new theory of entropy” by A. N. Panchenkov (1999). Object of research – the Active Complex organized Systems (ACS) class “nature-society”; subjects – concept and conditions of “equilibrium” and “Sustainable Development” (CSD in the abbreviation UN, 1993) such systems. Research methods – game-theoretic modeling and “Games against Nature”: antagonistic, coalition, cooperative, strategic, situational, etc., which required by the conditions of setting tasks, games. In the simulation, this will ensure the full integration of all currently available natural science knowledge, as well as the ability to perform computational operations others organizational management systems of the class “nature-society”. For that in this study suggests a new “geosystem” approach to the study of sustainable development problems in urban environmental policy, which includes the possibilities of both external (“technogenic”) and internal (or “soft”, that is, maintaining and restoring the ecological balance) management of Nature and Society.
Analysis of the Distribution of Movement Speed from Time of Day
Authors: Goryaeva E V , Mokhirev A P , Medvedev S O , Bragina N A
Published: May 2021

Logging is carried out in difficult natural and climatic conditions, being often unprofitable for large industrial enterprises. However, it is the provision of forest resources that allows all other enterprises of the timber industry to carry out their activities. Transportation of forest products is most interesting from the point of view of setting and solving problems to improve the efficiency of the production process. Indeed, when delivering goods from the forest, there are many possible problems that need to be solved and ultimately affect its overall efficiency: the choice of route, traffic schedule, equipment, removal period, etc. At the same time, even when selecting optimal parameters, there are always factors that affect the work of equipment and personnel when removing wood in specific conditions. One of these factors is the time of day. The purpose of this study is to identify the nature of the dependence of the speed of movement of logging equipment on the time of day.
Features of the Distribution of Manganese in Soils of the Prichulym Taiga in Tomsk Region During Forest Logging
Authors: Kh Khasanova E , Afonin I V , Bazhenova Y A
Published: May 2021

In the course of the summer expedition, soil samples were taken from the upper, the most ‘active’ for migration and pollution by chemical elements, horizon in the taiga zone of Zyryanskiy district, Tomsk region. Soils were sampled in two plots: in a typical taiga forest and in the area after selective logging carried out six years ago. The selected soil samples were analyzed for the presence and total content of manganese. As a result of statistical data processing, the average value of the content of this element was obtained. Changes in the species composition of vegetation in the logged area could affect the redistribution of the considered chemical element in the soil. For a complete picture of the deposition and the reasons for possible migration of manganese in the upper layer of the soil horizon, the acid-base conditions and the organic component (humus) were additionally determined in the soil samples. The global indicators of the world’s soils – clarke values – were used as standards to compare with the average values of the manganese content in soil. The obtained average values of manganese in the upper horizon of soils in the studied areas were compared with respect to the data on the content of manganese in soils of the taiga forest zone of Eurasia. The southeast of Tomsk region is included in this zone. Based on the ecological and geochemical analysis, the reasons for the change in the content of manganese and the degree of its dangerous impact have been revealed. This characteristic made it possible to interpret the data obtained on the manganese content in the soil of the study areas, as well as to assess the state of the environment after anthropogenic transformation and other possible factors.
Classification of Some Spring Waters in Erbil Governorate Using Different Methods
Authors: Rajab K.S. , Esmail A.O.
Published: May 2021

This study was conducted during 2020, The water samples were taken on June and October,2020 which were represent wet and dry season respectively from 22 springs in Erbil governorate. Some water chemical properties and heavy metals were determined at both wet and dry season, the studied spring waters were classified according to some systems or methods such as classes depending on restriction of use, irrigation water quality index, cluster analysis and principal component analysis. In general, the results depending on the mentioned methods of classifications had similar results. The water for 12, 8 and 2 springs had none restriction, slight to moderate and severe restriction of uses at wet season respectively, while in dry season the water for 9, 9 and 4 springs had None restriction, slight to moderate and severe restriction of uses respectively due increase in water EC values in dry season in comparing with wet season. Depending on IWQI values using all the studied water parameters the water for 15and 7 springs had excellent and good class respectively,while depending on IWQI for EC only the water for (13,5,and 4) springs in wet season and the water for(12,4 and 4) springs in dry season had excellent,good and poor classes respectively. The cluster analysis and principal component analysis also classified the spring water samples into three classes also.
In Vitro Bioaccessibility Assessment as a Tool to Predict the Toxicity of Bioremediation Products
Authors: Jebril N. , Boden R. , Braungardt C.
Published: May 2021

The demand for the development of bioremediation processes designed to maintain healthy environments has increased; however, evaluation of the toxicity of its products is needed. Therefore, the toxicity of the Cd-loaded beads of the bioremediation approach developed in this paper was evaluated by using in vitro human gastrointestinal simulation (BARGE method). Cd-loaded beads were obtained from adsorption experiments of Cd from artificial groundwater (AGW) and natural river water (NRW, Walkham River, England) using Ca-alginate beads containing live cells of the mutant Brevibacillus agri C15 CdR and its wild type B. agri C15, in batch flasks. The results showed that the Ca-alginate beads containing the mutant adsorped a significant concentration of Cd (1700 mmolal), related to its adsorption capacity. Cd-loaded beads had higher concentrations of Ca and Na (2030 ± 40 and 4300 ± 18 molal, respectively), related to its composition. The effects of the gastrointestinal simulation showed that Ca had the highest bioaccessible concentrations from Cd-loaded beads of all tested elements (Al, Ca Co, Cu, Fe, K Mg, Na, and Zn) from (1280 ± 13.00 molal); while some other elements were not detected at the end of the gastrointestinal system. Cd bioaccessibility was significantly lower in the Cd-loaded beads containing the mutant (0.17 and 0.14 molal in the gastric and gastrointestinal phases, respectively), compared to the wild type (0.23 and 0.19 molal, respectively). The bioaccessible fractions (BAFs) of Cd were significantly lower in the Cd-loaded beads containing the mutant at the gastric and gastrointestinal phase, with the mean of 4.85 % and 2.95 %, respectively. The low percentages of BAFs of Cd suggested that the products of the bioremediation process developed in this project might not be relevant as a human health risk.
Response Polianthes Tuberosa L.to Cold Storage Time and Chitosan on Vegetative Growth and Floral
Authors: Alsanam M.A. , Salih Z. K.
Published: May 2021

The study was conducted at the Horticultural Establishments Unit of the Department of Horticulture and Landscape - College of Agriculture - Tikrit University. for period from 15/3/2020 to 15/1/2021, aim of knowing response of polyanthus bulbs to cold storage before planting and spraying with Chitosan. two factors: first was storage of bulbs before planting at a degree of 5 C° for a period of 0, 1, 2 a week, and the second factor was sprayed with chitosan at a concentration of 0, 500, 1000 mg. L−1 the experiment was designing with RCBD in three replications. The results showed that the two-week storage treatment exceeded the number of leaves, Leaves area, and leaf width gave 19.37 leaves. Plant−1, 703.84 cm2, 17.65 mm, respectively. The treatment of spraying with chitosan at a concentration of 1000 mg. L−1 was superior to inflorences length and the diameter of the roses, and it gave 88.71 cm, 34.70 mm. The highest concentration (nitrogen, phosphorus and potassium) was 1.99, 0.368, 2.21% for the interaction between storage for two weeks and spraying with chitosan at a concentration of 1000 mg. L−1.
Effect of Salicylic Acid and Arginine Spraying on Growth and Some of Its Active Compounds of Basil Ocimum Basilicum L
Authors: Shraida A. S. , Almohammedi O. H. M.
Published: May 2021

The study was conducted in the fields of a farmer in Baghdad Province/Abu Ghraib district during the 2019-2020 agricultural season to study the effect of two factors. The first factor was spraying salicylic acid on the plant with four concentrations (0,100,200,300) mg. L -1. The second factor was spraying amino acid Arginine on the plant with four concentrations (0,100,200,300) mg. L -1. Each level was sprayed before sunset until the plant leaves become completely wet. The spraying was done twice during the growing season. Results showed that the treatments of foliar spray with Salicylic Acid, the treatment with Arginine spray, and the interaction treatments were superior in terms of improving plant height, leaf area, and ratios of volatile oils ratio, phenols, nitrogen, and proteins.
Corona, the story of an animal disease that killed humans
Authors: Shahooth M. A. , Abed S. k.
Published: May 2021

The aim of this review is to investigate and identifying the possible source of virus in animals and identifying the vector media of the disease and the methods of its spread and working hard to search for a successful vaccine for immunization against infection, in addition to establishing specialized units to predict new versions of the virus in the years to come.
Study on composition analysis of foaming agents used in backfilling high-strength lightweight fluidized soil
Authors: Ran Deqin , Chen Peng , Li Yiran , Hui Bing
Published: May 2021

This paper studies the pollutants released by the foaming agent used in the green and low carbon backfill material of high strength and light fluid soil, which can effectively solve the problem of “bridge jump”. The results showed that the concentrations of total volatile organic compounds, benzene, toluene + xylene and free formaldehyde in the pollutants were all within the qualified range. The concentration of non-methane total hydrocarbon in the pollutants increases with the increase of temperature. The concentration of non-methane total hydrocarbon in the pollutants is 3.90mg/m3 at 180°C, which is within the allowable range. During production and use, attention should be paid to ventilation and monitoring.
C-Mn yield forecasting model based on SVM
Authors: Li Jinghang , Bai Juanli , Yu Bozhong
Published: May 2021

With the rapid development of economy, how to increase steel output and reduce plant cost is of great significance. Deoxy alloying is an important link in iron and steel smelting. This paper aims at the optimization of the burdening scheme of deoxy alloying of molten steel. The aim is to establish the SVM optimization model based on the data and predict the yield of C/Mn. First of all, we established a time series model based on the obtained results of the problem and the furnace times as the time, and used the ARIMA time series method in SPSS software to predict the yield of C/Mn. Secondly, we improve the model, use the historical data to train and forecast the support vector machine model (SVM), and compare the predicted values of the SVM model and the time series model, and get the conclusion that the SVM model is more accurate than the time series model.
Application analysis of isotope water absorption profile in ternary test of second class weak alkali
Authors: Zhang Hongdi
Published: May 2021

In the weak alkali ASP flooding test of Pu II 4 - 9 reservoir in the second area of north east block of lamadian oilfield, the original well pattern of strong alkali ASP test area was used for backward development of Pu II 4 ~ 9 reservoir. According to the analysis of isotope water absorption profile results, the production degree of blank water flooding reservoir was obviously higher than that of strong alkali ASP test at the same stage. In this paper, the principle of isotope water absorption profile reflecting the utilization degree is analyzed, and it is considered that poor water quality is the reason for the large difference of utilization degree in test areas, and the feasible methods to reduce this kind of influence are put forward, and the corrected utilization degree in test areas is given.
Research on Construction Control of Vertical Rotation of Concrete-filled Steel Tubular Basket Arch Bridge
Authors: Ma Yurong , Chen Haibo , Han Qianwen
Published: May 2021

This paper focuses on the theme of bridge construction control, using the finite element analysis and calculation program as the platform, taking a concrete-filled steel tube concrete basket arch bridge as the research object, combining the theoretical foundation of the concrete filled steel tube basket arch bridge, and using finite element software to simulate the rotating structure in three dimensions Simulation, analysis of the force status and longitudinal and lateral changes of the rotating structure at various angles and when closing, and the structural stability analysis of the rotating process. The most unfavorable stress conditions and the most vulnerable to instability conditions are determined. And through simulation, the accuracy of the line shape of the steel pipe arch rib in the vertical rotation process, the accuracy of the arch axis detection and the accuracy of the elevation detection are estimated.
The Application of Fuzzy Comprehensive Evaluation Method in Evaluating Remaining Oil Potential of Oil Layer
Authors: Sun Lijing
Published: May 2021

In this paper, remaining oil saturation, microfacies type, oil layer thickness, structure, permeability variation coefficient, injection-production relationship, injection-production perfection degree, effective perforation thickness, connected thickness, water injection distance, water injection well pattern, water cut of oil well and production measures, these thirteen static and production dynamic indicators constitute the evaluation factor set of remaining oil potential, hierarchy and statistical analysis of weight coefficients are carried out for each factor, taking block A as an example, the multi-level fuzzy comprehensive evaluation method is used to quantitatively evaluate the remaining oil potential of complex heterogeneous reservoir, so as to achieve the purpose of regional governance in accordance with size of remaining oil potential.
Optimization Research on Centralized Monitoring Design of Ternary M1 Joint Station
Authors: Fu Siqiang
Published: May 2021

In the centralized monitoring construction mode of oilfield stations, the original duty posts set by functional units are cancelled, and a centralized control room is set up to transmit the production data information to the central control room and then upload it to the higher-level production command system step by step, so as to realize remote monitoring, centralized duty, unified layout, unified monitoring and unified management in the station. The density of well pattern and stations in old oilfields is large. With the construction of productivity projects, it is necessary to make rational use of existing facilities to complete the optimization study of centralized monitoring design of new stations, so as to reduce the difficulty of production management, improve the quality of monitoring system and improve the level of production management. In this paper, the centralized monitoring design of ternary M1 joint station is optimized through comparison and selection of multiple schemes, and a reasonable monitoring system construction mode is selected according to each station’s own situation, so as to simulate the employment situation of production operation management, fully analyze and consider the production management needs, and avoid affecting the production operation due to the omission of centralized monitoring design.
Quantitative evaluation of water injection composition in high injection-production ratio blocks - Taking Chao 5 well block as an example
Authors: Zhao Guozhong , Wang Hongwei , Jing Min , Zheng Xinbao , Fu Zhiguo
Published: May 2021

The injection-production ratio of the oilfields in the periphery of the Changyuan Placanticline is high. The cumulative injection-production ratio of the main oilfields in the Putaohua oil layer is between 1.29-2.46, and the cumulative injection-production ratio of the main oilfields in the Fuyang oil layer is between 1.98-2.65. At present, the viewpoints of high cumulative injection-production ratio and large ineffective water injection are generally concentrated on unmarked reservoir sandstone sections, water absorption by shale, overflow along faults and fracture systems, measurement errors, and pipeline leakage. In response to the above problems, this paper takes the Chao 5 well block as an example, establishes a block-wide numerical simulation model, carries out a quantitative evaluation of the water injection composition of a high injection-production ratio block, and analyzes the main controlling factors of different types of water injection. The research results show that the water absorption of the reservoirs in the North Chao 5-Chao 5 block accounts for 55%, the unmarked reservoir section absorbs 28%, and the mud shale absorbs 8%; the overflow of water drops to 12%. The research content of this article has a certain guiding significance for improving the level of oilfield water injection development and ensuring the efficient and sustainable development of oilfields.
Research on quality inspection technology of gas drainage borehole sealing hole in Sihe Coal Mine
Authors: Chen Yutao
Published: May 2021

The quality of the hole sealing of coal seam gas drainage directly determines the efficiency of coal seam gas drainage. This paper uses the YFZ3 gas drainage borehole sealing quality tester to measure the gas drainage parameters at different locations in the borehole W33011 coal seam in Sihe Coal Mine. According to the change law of the measuring point data, it judges the quality of the sealing hole and determines the reasonable sealing depth. The research results show that Sihe Coal Mine should strengthen the training and supervision of underground plugging workers, and strictly control the details of the plugging process, such as the grouting pressure, water-cement ratio configuration and grouting volume during the plugging process. The detection borehole has a serious air leakage channel in the range of 12m~20m, and the sealing depth should be increased to 20m to increase the concentration of single-hole gas drainage.
The positioning principle of global positioning system and its application prospects
Authors: Wang Yingchun , Li Yuan
Published: May 2021

Due to the continuous advancement of science and technology, more and more construction fields have realized the transformation from science and technology to productivity. Including GPS positioning technology. GPS (Global Positioning System) is a system that uses positioning satellites to achieve precise global positioning and can also navigate. The United States developed and used a satellite navigation and positioning system in 1994. The application of this technology has basically covered all areas of the national economy. GPS is widely used in ground surveying, engineering surveying, aerial photogrammetry, topographic surveying, etc. in the field of surveying. The application prospect of GPS system is introduced.
Calculation of radius of plastic zone in surrounding rock of roadway
Authors: Xu Zunyu
Published: May 2021

Morh-Coulomb yield criterion and Drucker-Prager yield criterion are two commonly used strength criteria in geotechnical analysis. The former is considered to be more suitable for geotechnical media. In this paper, the plastic zone radius of roadway surrounding rock is compared with two yield criteria under different influence factors. Finally, the different characteristics of two yield criteria and the application in engineering design are obtained.
Reasonable utilization and study of rainwater in semiarid area
Authors: Zhu Tingting
Published: May 2021

The important way to improve productivity and realize sustainable development in semi-arid area is to utilize rainwater, this paper takes Fengxi New Town as an example, comprehensively uses the Analytic Hierarchy Process (AHP) and fuzzy comprehensive evaluation method to comprehensively evaluate and analyze the utilization benefit of rainwater. The results show that the weight of rainwater utilization benefit is ecological benefit > economic benefit > Social benefits benefit; the strategy of efficient utilization of rainwater in semi-arid area is put forward.
Study on the Improvement of Ecological Environment in the Space of Shanghai Primary and Secondary Schools by Rain Gardens
Authors: Yan Fanghan
Published: May 2021

Low Impact Development (LID) is a technology of rainstorm management and water pollution treatment developed in the late 1990s. As one of the LID measures, rain gardens can alleviate the urban rainstorm in Shanghai. Aiming at the low rate of environment utilization in the spaces of Shanghai primary and secondary schools, this paper proposes to collect the rainwater runoff from buildings and roads in the form of rain garden. We try to use artistic design techniques, and establish the campus environment with the value of rain and flood management, sustainability and biodiversity. The study results show that the sample rain garden covers an area of 310m2 with a water storage depth of 30mm, and has recorded 6 short-term heavy rainfalls and 1 overflow in 1 year. The biodiversity has increased by 70%.
The production and treatment of industrial waste water
Authors: Peng Haoyu
Published: May 2021

With the acceleration of industrialization in China, the quantity and scale of industrial waste water will continue to increase, and higher requirements will be put forward for the treatment of industrial waste water. This paper aims to analyze the current situation of industrial waste water production, summarize the problems in the process of waste water treatment, and provide measures to improve the quality of industrial waste water treatment based on the actual situation, so as to provide reference for similar research. At present, the rapid development of China’s industrial industry, the continuous increase of industrial economic scale, promote the rapid development of the national economy, resulting in varying degrees of environmental pollution. In fact, many industrial enterprises pay more attention to efficiency than waste water treatment, or directly discharge waste water that does not meet environmental standards, which directly affects people’s normal life and destroys the original ecological balance. Through the powerful industrial waste water treatment, has the practical significance.
Fracture analysis and improvement of charging pump shaft in nuclear power plant
Authors: Liu Jihua , Chang Xincai
Published: May 2021

The charging pump of a nuclear power plant is a multi-stage double shell centrifugal pump. From the installation period, the pump shaft broke after 25 times of start-up and shutdown and 2913 hours of cumulative operation. As the charging pump is one of the core equipment in the normal operation and accident of the nuclear power plant, the root cause of the pump shaft fracture must be found and corrective measures must be taken, otherwise there will be major safety hazards. Through the analysis of the material, design structure and mechanical properties of the pump shaft, it is found that the root cause is that there is a deviation in the processing of the structural dimension of the stress relief groove of the pump shaft, which leads to the insufficient fatigue strength margin and the occurrence of abnormal operation conditions during the superposition commissioning, which leads to the fracture of the pump shaft. By optimizing the structural design of the stress relief groove and controlling the reasonable operation, no fracture occurred again. The causes and treatment of this typical event can provide certain theoretical support for the design, operation and maintenance of similar equipment.
Short-term load forecasting based on MA-LSSVM
Authors: Wei Liangkun , Li Jianguo
Published: May 2021

Aiming at the problems of low accuracy and poor accuracy of short-term load forecasting (STLF), monkey algorithm (MA) and least square support vector machine (LSSVM) are combined for STLF. The input factors of the model are load data and meteorological information. MA is used to optimize the kernel function parameter σ and the regularization parameter λ of LSSVM to obtain the optimal solution of the least square support vector machine prediction model. Then a STLF model was established.
Study on electrolyte additives of water-based magnesium batteries
Authors: Wang Panpan , Xu Jing , Gong Youlai , Chen Changguo
Published: May 2021

The effects of different inorganic salt additives on the corrosion resistance, hysteretic behavior and activation potential of magnesium anode in MgSO4-Mg(NO3)2 composite electrolyte (1.86 mol·L-1 Mg(NO3)2 + 0.14 mol·L-1 MgSO4) were compared by electrochemical method. The electrochemical test results showed that in the solution containing 0.02 mol/L NaHCO3, the activation potential of magnesium anode was the most positive, the passivation range was expanded, and the polarization current was reduced. The impedance of magnesium alloy with 0.02 mol/L NaHCO3 has the highest corrosion resistance, which is consistent with the conclusion that the corrosion current density of Tafel polarization curve is the lowest. Under the additive concentration, the magnesium anode has the shortest lag time, the most negative discharge potential and the least potential drop, which greatly improve the discharge performance of magnesium anode.
Operation mode of integrated energy system considering behavior characteristics of multiple subsystems
Authors: Gong Chuanzheng , Lin Linjia , Yan Qibo , Tang Chenghong , Ge Yangyang , Luo Gang , Zeng Ming , Liu Ximei
Published: May 2021

With the deepening coupling of power, natural gas and thermal network, the operation mode of integrated energy system has gradually become a new research hotspot. In this paper, taking the park level electric-heat-gas integrated energy system as an example, based on the study of its main characteristics, a mathematical model for the optimal operation of the integrated energy system is constructed, which mainly considers the gas turbine, energy storage and other equipment, in order to realize the economic operation of the system.