bluuebunny/crossref_metadata_2025 huggingface dataset:
The novel P
II
-interactor PirC identifies phosphoglycerate mutase as key control point of carbon storage metabolism in cyanobacteria
Authors: Orthwein Tim , Scholl Jörg , Spät Philipp , Lucius Stefan , Koch Moritz , Macek Boris , Hagemann Martin , Forchhammer Karl
Published: February 2021

Significance

In this work, we identified the regulatory mechanism of the key control point of cyanobacterial carbon metabolism, the glycolytic phosphoglycerate mutase (PGAM) reaction, converting 3-PGA into 2-PGA and thereby exporting organic carbon from the photosynthetic Calvin cycle. We show that PGAM activity is controlled by a small modulator protein PirC (product of
sll0944
), which inhibits the enzyme through protein–protein interaction. The availability of PirC for PGAM inhibition is controlled by the pervasive carbon/nitrogen balance regulator P
II
, which sequesters PirC at low 2-oxoglutarate levels and releases it at high 2-oxoglutarate levels. PirC-mediated inhibition of PGAM triggers glycogen accumulation, and disrupting this regulation allows the redirection of carbon flux, a decisive requirement for transforming cyanobacteria into green factories.
IL17A critically shapes the transcriptional program of fibroblasts in pancreatic cancer and switches on their protumorigenic functions
Authors: Mucciolo Gianluca , Curcio Claudia , Roux Cecilia , Li Wanda Y. , Capello Michela , Curto Roberta , Chiarle Roberto , Giordano Daniele , Satolli Maria Antonietta , Lawlor Rita , Scarpa Aldo , Lukac Pavol , Stakheev Dmitry , Provero Paolo , Vannucci Luca , Mak Tak W. , Novelli Francesco , Cappello Paola
Published: February 2021

Significance

There are controversial data about the protumoral role of pancreatic cancer stroma, and dissecting multiple aspects will help to develop effective tailored therapies. Interleukin-17A (IL17A) has been reported to accelerate pancreatic acinar–ductal metaplasia, be important for maintaining stem-like cancer cells, and recruit immunosuppressive granulocytes into the tumor. Here we unveil a relationship between IL17A and pancreatic stromal cells, which strongly modifies their gene and protein expression profiles. Ablation of IL17A, in fact, modifies the cytokines/factors released by tumor fibroblasts by limiting T cell immunosuppression. IL17A inhibition may represent an important tool for designing novel combined therapeutic approaches.
Plant virus evolution under strong drought conditions results in a transition from parasitism to mutualism
Authors: González Rubén , Butković Anamarija , Escaray Francisco J. , Martínez-Latorre Javier , Melero Ízan , Pérez-Parets Enric , Gómez-Cadenas Aurelio , Carrasco Pedro , Elena Santiago F.
Published: February 2021

Significance

Viruses are seen as selfish pathogens that harm their hosts to ensure their own survival. However, metagenomic studies are drawing a new picture in which viruses are present everywhere and not always associated to diseases. A classic observation in plant pathology is that the outcome of infection depends on environmental conditions. Here, using experimental evolution, we show that the relationship between a plant virus and its natural host can evolve from pathogenic to mutualistic under severe drought conditions. While viral strains evolved in normal watering conditions increased their virulence, drought-evolved viral strains confer plants with greater resistance to drought. We show that this transition to mutualism depends on a complex reorganization of hormone-induced signaling pathways and changes in gene expression.
Supporting students’ content learning in Biology through teachers’ use of classroom talk drawing on concept
sketches
Authors: Ho Caroline , Kwai Yeok Wong June , Rappa Natasha Anne
Published: February 2021

This article examines teachers’ attempts to enhance students’ content learning in Biology through the use of talk
centred on concept sketches. Of specific interest is how teachers provide scaffolding through purposeful classroom discourse
(Lemke, 1990) with the use of talk moves (Chapin, O’Connor, & Anderson, 2013), drawing on concept sketches (Johnson
& Reynolds, 2005) annotated by students. Informed by socioconstructivist (Vygotsky, 1978/86) perspectives and grounded in multimodal literacy (Kress & van Leeuwen, 2001) underpinnings, the study acknowledges the teacher’s role
in productive classroom discussions to guide students’ thinking and facilitate meaning-making. Qualitative analysis of classroom
discourse illustrates how teachers’ classroom talk can scaffold and address the gaps in students’ learning. Pedagogical
implications are discussed.
Co-developing science literacy and foreign language literacy through “Concept + Language Mapping”
Authors: He Peichang , Lin Angel M.Y.
Published: February 2021

Drawing on Lemke’s (1990) “thematic patterns” theory, this research
proposes a “Concept + Language Mapping” (CLM) approach and tried it out in an English Medium Instruction (EMI) biology classroom
in Hong Kong. Lessons were observed and samples of student work were collected during the intervention with student/teacher
interviews conducted afterwards. A quasi-experimental design was also adopted to estimate the impact of the CLM approach. The
analysis indicated that CLM facilitated the development of both content and language knowledge.
Scaffolding for cognitive and linguistic challenges in CLIL science assessments
Authors: Lo Yuen Yi , Lui Wai-mei , Wong Mona
Published: February 2021

In Content and Language Integrated Learning (CLIL) programmes, students learn some non-language content subjects
through a second/foreign language (L2), and their content knowledge is often assessed in their L2. It follows that students are
likely to face challenges in both cognitive and linguistic aspects in assessments. Yet, there has been limited research exploring
whether and how CLIL teachers help their students cope with those challenges. This multi-case study seeks to address this issue by
investigating the instructional and assessment practices of two science teachers in Hong Kong secondary schools. The two teachers
presented an interesting contrast – one teacher incorporated both implicit and explicit language instruction in her lessons, so
her students were well prepared for the assessment tasks; the other teacher’s instructional and assessment practices were heavily
content-oriented, and it is not sure whether students mastered both content and L2. These findings illuminate CLIL pedagogy and
teacher education.
Individualization of practice distribution in second language grammar learning
Authors: Suzuki Yuichi
Published: February 2021

The aim of the present study was establishing to what extent individual differences in cognitive aptitudes were
associated with second language (L2) morphological acquisition under different practice distribution. Sixty participants studied
morphological rules of a novel miniature-language system in order to use them for oral production. They engaged in four training
sessions in either shorter-spaced learning (twice a week) or longer-spaced learning conditions (once a week). Their oral
production performance both during and after the training was related to their metalinguistic rule rehearsal ability (MRRA) and
working memory capacity (WMC). Multiple regression analyses revealed that MRRA predicted learners’ training and posttest
performance mainly under the longer-spaced condition, while WMC played a limited role at best under both learning conditions.
These results suggest that practice distribution may be individualized based on learners’ aptitude strengths to optimize L2
morphological learning.
The associations between individual differences in working memory and the effectiveness of immediate and delayed
corrective feedback
Authors: Fu Mengxia , Li Shaofeng
Published: February 2021

This paper reports on a study investigating the role of working memory in predicting L2 development under
immediate and delayed corrective feedback (CF) conditions. A total of 106 seventh-grade EFL learners were assigned to three
groups: Immediate CF, Delayed CF, and Task Only. Each group underwent three treatment sessions during which they performed six
focused communicative tasks – two in each session – involving the use of the English past tense. The Immediate CF group received
feedback on their erroneous use of the target structure during their task performance in Session 1; the Delayed CF group did not
receive feedback until the final treatment session; and the Task Only group performed the communicative tasks without receiving
any feedback. Treatment effects were measured through a grammaticality judgment test and an elicited imitation test. Working
memory was measured by means of an operation span test. The results revealed that working memory was a significant predictor only
of the effects of delayed CF, not those of immediate CF or task only. The findings suggest that delayed CF may have imposed a
heavier processing burden on the learners’ working memory due to the need to match the delayed feedback with the errors in their
procedural knowledge manifested in previous sessions. Based on the results of this and other empirical studies, the authors argue
for the superiority of immediate feedback over delayed feedback.
Working memory and planning time as predictors of fluency and accuracy
Authors: Brown Nielson Katharine , DeKeyser Robert M.
Published: February 2021

Working memory, which accounts for the ability to process information in the face of interference, is critical to
second language acquisition (SLA) and use. The interaction of working memory capacity (WMC) with specific pedagogical
interventions is a logical place for empirical SLA research, both to examine the cognitive processes underpinning second language
performance and to identify instructional treatments that may serve learners differently based on their WMC. This study considers
WMC along with two different types of pre-task planning time (guided and unguided) as predictors of the attempted accuracy and
fluency of learners’ discourse. Seventy-two intermediate ESL students from seven classes at a community college participated by
completing two different working memory span tasks, as well as two different “There-and-Then” oral story-telling tasks. The
treatment condition of the story-telling tasks was manipulated so that learners’ performance could be considered in terms of
provision of pre-task planning (+/− planning), type of planning (guided vs. unguided), and order of planning (planning first or
planning second). Task order had a clear effect on learners’ production, regardless of the provision of planning time. Guided
planning time promoted a focus on attempted accuracy and unguided planning time fostered fluency. Finally, this study indicates
that task conditions can affect high- and low-WMC learners in different ways: the former are more likely to comply with complex
story-telling instructions, requiring them to focus on grammatical form at the expense of fluency, whereas the latter are less
likely to comply with the same instructions.
The linguistic landscape of the Raval
Authors: Jódar-Sánchez José Antonio
Published: February 2021

The research presented in this chapter has three
purposes. The first purpose is to propose a new taxonomy of the
linguistic landscape with two overarching functions, the emblematic
and instrumental ones. The second purpose is to show that Google
Maps provides no advantage over a physical documentation of signage
in synchronic studies. The third purpose is to analyze the mismatch
between languages in commercial signage and the languages spoken in stores of the
Raval neighborhood and other areas of Ciutat Vella in Barcelona. It
is advised that the Llei de política lingüística,
or Catalan Language Act, is adapted to contexts of high influx of
immigrants to reflect their sociolinguistic reality and to avoid a
perception of Catalan as a fossilized language.
Reframing the question of correlation between the local
linguistic population and urban signage
Authors: Carr Jhonni Rochelle Charisse
Published: February 2021

While some scholars have argued that signage does
not reflect the linguistic population of a particular community, in
this chapter I argue for an empirical reexamination of this claim
and posit four necessary methodological measures: a comparison of
multiple cities, an exhaustive approach to data collection, an
analysis of the dominant language of both the main and informative
sections, and the use of descriptive and inferential statistics. I
apply the proposed model to a case study of three cities in Los
Angeles and a corpus of 4,664 signs. Although the LL will never be a
perfect mirror of the languages spoken in a community, a nuanced
analysis of sign configurations can provide insight regarding local
oral languages to varying extents.
Modelling the drying process in case of combined energy supply
Authors: Antipov S T , Arapov V M , Kazartsev D A , Babaeva M V
Published: February 2021

In many chemical, food, biochemical and other industries, drying is the prime process that is characterized by high energy consumption and determines the quality of the finished product. In this regard, the development of mathematical models that allow of optimization and reliable control of the drying process is relevant. A large set of physical and physicochemical phenomena accompanying drying, as well as their mutual influence on each other, gives rise to numerous uncertainties in the mathematical description of this process. The modeling process becomes more complicated under conditions of combined energy supply, for example, convective and microwave energy supply. In this article, based on the laws of chemical kinetics, the authors propose the original approach to modeling the drying process, which, together with experimental studies, allows obtaining a reliable mathematical model that can be used as the basis for optimizing and controlling this process. During the mathematical modeling of drying, it was proposed to apply new process parameters: the degree of drying (the share of removed moisture) and the degree of absorbed energy (the ratio of the amount of energy absorbed by the product at a given moment to the amount of energy absorbed by the product during the entire process). The expediency of characterizing the kinetics of drying by the dependence of the degree of drying on the degree of absorbed energy is demonstrated. The scientific hypothesis was substantiated and confirmed: the generalized characteristic, the kinetics of drying - the dependence of the degree of drying on the degree of energy absorbed by the product, does not depend on the parameters characterizing the drying mode. The proposed model makes it possible to determine the ratio of the components of convective and microwave energy flows when moisture is removed from the material, which can be used as the basis for optimization and reliable control of the process.
Possibilities of deep learning neural networks for satellite image recognition
Authors: Averkin A N , Yarushev S A
Published: February 2021

The main problem solved in this project is the analysis of big data using a system of computer processing and recognition of satellite images, based on a deep neural network architecture. The goal of the project is to develop methodological, theoretical and practical aspects of building such systems in poorly formalized subject areas, as well as to study the possibilities and advantages of building predictive models for analyzing fresh water reserves and predicting the direction, speed and nature of the spread of large fires using such systems. and assessments of the economic impact of these natural disasters.
Diagnostics of operational wear in hybrid load-carrying cables
Authors: Krakowski T , Molski S , Ruta H , Lonkwic P , Tofil A
Published: February 2021

Along with the development of lifting devices, the new hybrid load-carrying cables were introduced to the market. The solutions of this type covered both, steel ropes of circular section and belts being a hybrid combination of many steel ropes potted with plastic coating into a single flat friction belt. Such design of ropes as compared to the traditional round steel ropes enabled to reduce the drive wheel diameter while maintaining frictional contact conditions and required ratio of the drive wheel and load-carrying cable diameters that is at least 40. Despite the above-mentioned advantages, a research issue that is of interest but so far has not been fully investigated is the process of wear of the hybrid load-carrying cables and evaluation of the technical condition of ropes being the load-carrying elements in the applied solutions, especially during the long-term operation. This article presents the possibilities of applying the magnetic method for evaluation of the technical condition of steel ropes being the load-carrying element of hybrid belts. The authors have presented their solution of the measuring head for magnetic testing of the load-carrying hybrid cables, elaborated by the team of employees of the Department of Machine Engineering and Transport at University of Science and Technology in Cracow, that enables the quantitative assessment of the hybrid load-carrying cable wear.
Reduction of the end-effect in surface texture analysis
Authors: Podulka P
Published: February 2021

The edge-effect in the filtering of the results of surface topography measurements is presently one of the most significant and radical challenges in surface texture assessments. Errors in data analysis are next to measurement problems the most affecting factor of the accuracy for the results obtained. This paper investigates reduction of the edge-filtering-effect of cylinder liner surface textures. Different edge-robust data analysis methods were applied and compared with commonly-used procedures, e.g. those available in commercial software of measurement equipment like various regression Gaussian filters. It was assumed that some of surface topography features are more vulnerable for their false estimation when they are edge-locates and their size (depth, width, section) might be a potentially decisive factor in selecting a correct procedure. The influence of the proposed methods on the selected surface topography parameters (from ISO 25178 standard) calculation and their comparison with the typically used procedures (e.g. Gaussian regression filter) was also comprehensively studied. It was found that some of the digital filters, commonly recommended for commercial software of measuring equipment, did not always provide consistent or direct results when textures with relatively large valleys were carefully examined.
Comparative study of coal samples from different deposits of Kuzbass
Authors: Zaostrovsky A N , Grabovaya N A , Ismagilov Z R , Mikhaylova E S
Published: February 2021

In this work, the objects of the study were CWC coals (coking weakly caking coals). The samples were characterized by technical analysis, which showed that the coals are close in ash content (Ad = 3.4-8.4%) and the yield of volatiles (Vdaf = 18.4-21.4%). Petrographic analysis determined the vitrinite reflection index (Ro, r), which showed that the studied coals, according to the genetic classification, belong to the 11-13 class, corresponding to the CWC grade coals. Based on the vitrinite reflectance index, reflectograms were compiled, which are an effective means of assessing the quality of coal.
Investigation of the structural characteristics of vitrinites of some coals of the Kuznetsk Basin
Authors: Ismagilov Z R , Popova A N , Fedorova N I
Published: February 2021

In this work, the structural parameters of vitrinites of coal of various degrees of metamorphism were investigated by X-ray diffraction methods. Vitrinite concentrates were obtained from coal of the Kuznetsk Basin by the method of fractional analysis of coals, according to which the studied fuel is stratified into fractions in liquids of different densities. The following X-ray structural parameters were analyzed: the number of carbon atoms in the lamellae (natC), the longitudinal size of the lamellae, the height of their stacking (La and Lc), the number of polyaromatic layers in the stack (N), and the packing density of the lamellae (ρ). It was shown that in vitrinite concentrates, an increase in all analyzed structural parameters (Lc, La, natC, N, ρ) is observed with an increase in the degree of metamorphism, at the same time, a decrease in the value of the interplanar distance (d002) is observed. The performed X-ray diffraction studies showed that the average number of layers in a package and carbon atoms per monolayer in the samples of vitrinite concentrates of bituminous coals of high stages of metamorphism (Ro, r = 1.41%) varies from 7 to 8 and 14-15, respectively. A correlation was found between the linear nature of the number of arene layers and the height of their packing. The results obtained are in good agreement with the literature data given for coals of various deposits.
Determination of the parameters of the porous structure of carbon sorbents based on Kuzbass fossil coals by the method of low-temperature nitrogen adsorption
Authors: Dudnikova Y N , Zykov I Yu , Sozinov S A , Ismagilov Z R
Published: February 2021

The paper presents a technique for measuring the parameters of the porous structure of carbon sorbents obtained on the basis of Kuzbass fossil coals using an ASAP 2020 “Micromeritics” analyzer. The conditions for sample preparation were selected, which make it possible to record reproducible isotherms of low-temperature adsorption-desorption of nitrogen (77K) by the studied samples of carbon sorbents based on fossil coal of various grades. The textural characteristics of the porous structure of carbon sorbents were determined, such as the specific surface area (SBET, m2/g), the total pore volume (VΣ, cm3/g), the volume of micro-and mesopores (Vmicro, Vmeso, cm3/g) of the studied carbon sorbents. The textural characteristics of the porous structure of carbon sorbents were calculated from the obtained isotherms of low-temperature (77K) nitrogen adsorption-desorption. The textural characteristics of carbon sorbents were calculated by various methods implemented by the software of the ASAP 2020 analyzer “Micromeritics”: BET, Langmuir, DFT, t-Plot, Dubinin-Radushkevich, Dubinin-Astakhov, MP-method, Horvath-Kawazoe, BJH and Dollimore-Heal. The obtained values of the textural characteristics of the porous structure of carbon sorbents, calculated by various methods, make it possible to obtain more detailed information about the objects of study and to determine the scope of their further application.
Study of the molecular structure of hexane-insoluble asphaltenes in coal tar pitch
Authors: Sozinov S A , Sotnikova L V , Popova A N , Ismagilov Z R
Published: February 2021

A comprehensive study of the functional-group composition and structure of hexane-insoluble asphaltenes of coal tar pitch was carried out by methods of chemical elemental analysis, nuclear magnetic resonance (NMR), IR spectroscopy, scanning electron microscopy, X-ray diffraction (XRD), thermal analysis in combination with chromatography-mass spectrometry. It is shown that a hypothetical macromolecule of asphaltenes can be considered as a set of condensed aromatic nuclei of the peri-condensed type of 7 rings, which have alkyl substituents and connecting bridges consisting on average of 2 carbon atoms. The ratio of various structural units in the asphaltene powder is as follows: for one S-containing structure there are 4-5 N-and 1.3-1.7 O-containing structures. Sulfur atoms are contained in thiophene-like, thermally stable fragments of the structure and pass into the coke residue without decomposition. Oxygen is contained in thermally unstable carboxyl and phenolic groups, which decompose with the release of CO2, as well as in the composition of aromatic ethers that pass into the coke residue. The crystallographic characteristics of ordered structures formed by macromolecules of asphaltenes are studied. The average diameter of the packets is La of about 0.66 nm, with a thickness of Lc ≈ 1.30 nm, the distance between individual layers is d002 ≈ 0.34 nm, the average number of layers in the packages is n ≈ 5-7 pieces. In this case, the crystallinity of asphaltene powders does not exceed 30%. The data obtained by different methods are in good agreement and more fully characterize the structure of macromolecules of asphaltenes of coal tar pitch.
The development of simulating system of robotized technologies for thick and acute coal seams
Authors: Starodubov A N , Sinoviev V V , Klishin V I
Published: February 2021

This work is the solution of a task of creation of information system for robotized technologies of coal seams production in coal mines, which have difficult geological factors – thick seams with use of progressive technology – subvel caving output in under-excavated layer. Software development stages are shown. The software allows to increase the efficiency and quality of project decisions for coal mines through visualization and interaction of a process of decisions making based on simulating.
Summary of thermosetting composite material welding
Authors: Cui X , Tian L , Wang D S , Dong J P
Published: February 2021

Thermosetting composites are widely used in structural parts of aerospace industry. The research of thermosetting composites is also developing continuously, but the connection modes of thermosetting composites needs to be innovative. Mechanical fastening, adhesive bonding and melt welding are the commonly used connections. However, mechanical fastening and adhesive bonding have many disadvantages. Such as drilling, it not only makes fiber fracture, but also destroys composite materials. In adhesive bonding, surface treatment and bonding cycle need a lot of manpower. As time goes by, the bonding strength of the joint gradually decreases. Welding technology has great advantages in assembling and joining thermoset composites (TSC). Different from other review papers, this paper mainly discusses two methods of the surface of the Thermoset composites laminate to be coasted with a thermoplastic layer for the main welding method (resistance welding, ultrasonic welding), Thermoplastic hybrid interlayer and Thermoplastic film co-cure. The problem of thermal degradation of Thermoset composites in welding is discussed.
Analysis on characteristics of tectonic stress field of fractured rock mass based on surface joint distribution
Authors: Li Yawei
Published: February 2021

Tectonic stress is an important factor influencing the development of joints. The tectonic stress in Jijicao is preliminary analyzed based on joints measurement, structural features tracing and stereographic projection. It is considered that the NW and NE trending tectonic systems in the study area belong to the products of different tectonic processes in different times. After intrusion, Jijicao granite rock mass has been forced in normal fault type stress, and the NW steeply dipping joints under vertical maximum principal stress and horizontal minimum principal stress squeezing on NE generated. Thereafter, the in-plate action is adjusted, and the minimum principal stress is deflected from NE to NW, resulting in a steep inclined joint system with the maximum principal stress nearly perpendicular and the minimum principal stress being subjected to NW horizontal extrusion.
Application of Remote Sensing Technology in Land Use Survey of Mining Area
Authors: Yao Zhang , Shaoqiang Guo , Kekuo Yuan , Shunli Han , Zaiqiang Hu
Published: February 2021

Land Use and Cover Change (LUCC) survey is an important content to understand and study regional ecological environment change. The production and construction of coal mine will have an impact on the local ecological environment. The application of remote sensing technology to select high-resolution images, man-machine interactive interpretation method combined with field investigation verification was used to carry out LUCC in the study area. The current situation investigation can quickly and accurately grasp the land use types and distribution characteristics of the study area, and provide a reference for the rational land development and ecological environment protection in the process of coal mine production and construction in the future.
The failure mechanism of gentle incline rock slope during the process of rock cell retreating
Authors: daoqiu Huang
Published: February 2021

The main inducement for collapse disaster of gentle incline rock slope is differential weathering, and for rock breakage of it is rock cell. On the study of gentle incline rock slope in this paper, we established the mechanics mode of arbitrary rock in gentle incline rock slope, analyzed the failure mechanism of gentle incline rock slope during the process of rock cell retreat, and established the distinguish method of its stability based on fracture mechanics. Then, taking the rock mass slope of JIMINGSHAN in CHENGKOU as an example, analyzed the stability change law of each rock block during the process of rock cell retreated. The study result of this essay can provide certain theoretical foundation for the prevention of disaster of gentle incline rock slope.
Damage Identification of Simply-Supported Beam Bridge Based on Deflection Influence Line
Authors: Yunkai Zhang , Jianjun Guo , Guohua Li , Yuchen Fan
Published: February 2021

In order to extend the service life of the bridge and reduce the occurrence of catastrophic accidents, it is necessary to monitor and identify the damaged parts of the bridge in time. In this paper, the author firstly proposes a basic theory of deflection influence line, then analyzes the calculation basis and proposes a method of deflection influence line of simple supported structure. Finally, according to displacement-time curve of simply-supported beam structure under different load-moving speed can be obtained by using MIDAS, the mid span, damage degree and load-moving speed of structure model can be set to carry out the simulation calculation. The results show that: when the load moving speed is 10km/h, 30km/h, 60km/h and 100km/h, the influence line of deflection difference has no obvious change pattern, and there are different peak values, which cannot be used for damage identification. Under the static load condition, the influence lines of deflection difference at 1/2L position, 3/4L position and end part at 10% and 25% damage degree basically show linear change, while the deflection difference value at 1/2L position appears peak value, and the maximum deflection difference value at different damage positions shows nonlinear change. It indicates that the damage degree can be judged according to the deflection differences at the damage positions identified above.
Compaction Quality Fine Control of Fresh Concrete Based on Vibration Energy
Authors: Ce Bian , Ningbo Li , Zhenghong Tian , Feng Zhu , Xingshun Lei
Published: February 2021

To solve the problem of difficulty in controlling the construction quality of fresh concrete due to the low applicability and accuracy for the existed referencing vibration time when using internal vibrator, an innovative parameter of vibration energy density is created based on concept of energy and a hardened porosity prediction model is constructed considering the parameter and mix characteristics. The model is used to obtain the minimum porosity value of concrete and corresponding energy density threshold under certain ratio conditions. Finally, the accuracy and effectiveness of method are verified by field tests. The results show the method can realize precise quantitative quality control of concrete vibration and guide the construction work.
Analysis of point cloud data of tunnel cross-section using cubic B-spline curve
Authors: Li Zhiyuan , Wang Jian , Zhu Fengqi , Li Digui , Gu Wanqi
Published: February 2021

In order to overcome the problem of extraction and deformation information analysis of tunnel cross-section by 3D laser scanning technology in tunnel engineering application, a method of extraction and fitting of tunnel cross-section based on cubic B-spline curve was proposed. First, obtain the initial cross-sectional point cloud by using the cross-sectional intercept method based on the spatial point cloud subset;Then, the cross-section was fitted with a cubic B-spline curve, and the missing part of the point cloud was repaired automatically.In the end, specific points are extracted from the fitted cross-section point cloud to realize cross-section deformation analysis.And cross-section analysis of point cloud data of a section of subway tunnel shows that this method can quickly and accurately analyze the deformation information of the tunnel cross-section.
Study on mechanical properties of 3D printed rock mass samples with photosensitive resin material
Authors: Gao Yanhua , Bi Xiaochen , Liu Yang , Fang Zizhou , Liu Shenqiang
Published: February 2021

3D printing technology can provide an effective method for specimen preparation of rock mass, but the mechanical properties of 3D printed rock mass still need to be further studied. In this paper, uniaxial compression tests are carried out on the intact and jointed rock mass models which are printed by laser rapid prototyping printer with photosensitive resin materials, stress-strain curve and fracture propagation are obtained, and the mechanical properties of 3D printed rock mass are studied. The results show that the intact model of the photosensitive resin material has greater plasticity and stress hardening after the peak strength, while the jointed models have obvious brittle mechanical characteristics, but in general, plastic deformation occurs before brittle failure; that the joint dip angle has an important influence on the physical parameters such as the peak strength of the model, strain at brittle fracture, elastic modulus, and the crack propagation; and that photosensitive resin material can simulate rock fracture, but it is not as good as natural rock or rock-like material. The research results can be used for reference in the study of mechanical properties of photosensitive resin and its application in 3D printing for rock mass.
Discussion on the optimum configuration of section steel for the middle seismic tensile stress of the shear wall of an over-limit high-rise civil building
Authors: Wang Shuaiyu , Lei Honggang
Published: February 2021

A super high-rise civil building was originally designed with a relatively large area of shear wall section steel configuration, coupled with the configuration of steel bars, resulting in the construction of the project more difficult. To solve this problem, PKPM was used to build the model to extract and calculate the tensile stress of inflexible wall limbs under moderate earthquakes, and the configuration of the section steel in the original design was analyzed. An in-depth interpretation of the “Technical Points for Special Examination of Seismic Fortification of High-rise Buildings Exceeding Limits” (Jianzhi [2015] No. 67), Chapter 4, Article 12, Paragraph 4, on the provision of shear wall section steel configuration was conducted. Finally, based on the original design, an optimization criterion for the configuration of the section steel in the wall was proposed.
Hydrological changes along the Jing River and its causal analysis
Authors: Bing Jianping , Deng Pengxin
Published: February 2021

The hydrological response of rivers to upstream reservoir regulation is one of the increasingly important research issues of watershed management. In this study, a hydrodynamic coupling model was used to simulate water level and flow processes of the Jing river and diversion flow of three outlets before and after the operation of TGP (Three Gorges Projects). The results indicated that water level and flow of three diversion channels both decreased in flood and dry seasons: the compensation regulation of the TGP was significant to maintain the water level and flow of three diversion outlets in the Jing river, but it also increased zero-flow days in the diversion channels of the Yangtze River. The riverbed erosion of channels in the upper reaches as well as lower reaches caused hydraulic gradient varying so much that it can’t be ignored in the water exchange process between the Yangtze and Jing river. This mechanism cooperates with the operation of TGP to change the natural process of the Yangtze-Jing river’s hydrologic process. This work provides essential information for future water resources and environmental management of the river-lake system and facilitates the effective flow regulation of dams, which has significant implications not only for the Dongting river-lake system but also the similar lakes and rivers elsewhere.
Application of new pumping technology in dewatering in deep soft soil pit
Authors: Mao Xiyun
Published: February 2021

The soft soil stratum has low carrying capacity, poor permeability and is hard to be drained, which affects the excavation speed of foundation pit. This paper introduces the application of a new type of dewatering technology in deep soft soil foundation pit dewatering. This technology adopts air compressor and vacuum pump to improve the water collection efficiency and pumping efficiency effectively and gains good economic and environmental benefits.
Design of Lining Structure of Horizontal Swirl Spillway Tunnel
Authors: Zhou Heng , Xing Ruijiao , Di Shengjie , Huang Peng
Published: February 2021

In this paper, two methods of finite element and structural mechanics are used to study the design of the lining structure of the spillway tunnel, so that the design of each part of the spillway tunnel is economical, reasonable and safe. The finite element method is used to analyze the influence of the surrounding rock consolidation grouting, drainage holes, system bolts and the new and old concrete combination on the bearing capacity of the building. The results show that it is very necessary for the lining structure to be consolidated and grouted, to install system anchor rods and drainage holes. Inserting reinforcement for the old concrete lining is beneficial to improve the stability of the lining structure. Structural mechanics reinforcement can meet the safety and stability requirements of the lining structure.
Selection of jacking sequence and jacking parameter analysis of multi-row jacking pipes in water-rich sand
Authors: Deng Wenjie , Cao Guangyong , Lin Jian , Yang Junfeng , Yu Shixiang , Yang Zubing
Published: February 2021

For the purpose of safe and efficient construction of multi-row pipe jacking in water-rich sand layer, a case study was carried out, taking the three-row pipe jacking project of the water-rich sand layer in Haikou city as an example. Firstly, based on the analysis of the disturbance mechanism of surrounding rock in multi-row pipe jacking construction, the principle that multi-row pipe jacking construction should give priority to excavate two pipe jacking tunnels which are far apart in turn was established. Secondly, taking the maximum ground settlement at the center of pipe jacking as the judgment index, the optimal scheme of the construction sequence of multi-row pipe jacking was determined. Finally, based on the field measured data, the relationship between the jacking force, the pressure of the palm surface, the average frictional resistance and the jacking process during the jacking process was analyzed, and summarized the experience of the site construction. The results show that: (1)it is better to give priority to construct two pipe jacking tunnels which are far apart in the construction order multi-row pipe jacking; (2)Based on the empirical method of surface subsidence, the maximum surface subsidence at the center of pipe jacking group can be used as the judgment index to determine the optimal jacking sequence; (3)Under the condition of "from the two sides to the middle", the surrounding rock around the middle jacking pipe is greatly disturbed by the construction of the first jacking pipe, its jacking rate should be reduced on the basis of the first building jacking pipe, and the cutting rate of the cutter and the grouting pressure should be increased, so as to realize the continuous jacking construction. The results of this paper are of great reference value to the determination of the jacking parameters of multi-row pipes in the future.
Mechanism and Preventive Measures of External Fire Spread in Southwest Chinese Traditional Villages
Authors: Liu Yongjun , Liu Wenli , Tong Yu , Meng Tianchang , Su Yue
Published: February 2021

Rural building fires, especially catastrophic ones that destroy a large number of houses even total village in southern regions of China, are becoming a growing concern from common people to local governments. There is a few literature on research progress of large scale rural building fires in China. In this paper, several typical massively rural building fire cases are described firstly. Mechanism of external fire spread among rural wooden buildings is qualitatively analyzed secondly. Some important preventive measures, such as sandwich panels with inner galvanized sheet, are suggested thirdly. The authors hope this paper may provide valuable information and enlightenment for people who hope to learn about the current situation, research progresses and preventive measures of external fire spread in southwest Chinese traditional villages.
Evaluation of the effects of protective measures implemented in high-rockfill slope engineering based on the discrete element model
Authors: Li Zuozhou , Xue Fangfang , Liu Yang , Zheng Chengcheng , Cheng Lin , Ma Chunhui
Published: February 2021

There has to date been no quantitative analysis of the anti-sliding effects of protective measures implemented in high steep rockfill slope engineering under conditions of instability, despite the importance of this analysis for engineering design, improvement to engineering measures, and promotion of hazard warning and management. This study established a discrete element model (DEM) of a high steep rockfill slope based on an engineering project. Numerical simulation was used to investigate the anti-sliding effect of concrete retaining wall height on the high rockfill slope under conditions of instability, with a focus on the distributions of rock before and after slope instability, rock displacement, the quantity of rock crossing the concrete retaining wall, and the quantity of rock reaching the riverbed. The trajectory of rolling rock changes in velocity under different concrete retaining wall heights, and the resistance to rolling rock by the retaining wall were analyzed. Movement trajectories and velocity time-history curves of rolling rock suggested that a higher concrete retaining wall could enhance slope stability under long-term operation. Quantitative analyses determined the optimum height of the concrete retaining wall. The method proposed in this study could provide guidance for effective protective measures in high steep rockfill slope engineering.
Research on Road Slope Compound Monitoring System Based on Internet of Things Technology
Authors: Huang He , Liu Maodeng , Mao Youping , Du Mengqin , Zhang XiaoSong
Published: February 2021

Because the stability of the slope is affected by many factors, in order to be able to collect as much information as possible about the stability of the slope, a multi-parameter, multi-device composite system integration based on the Internet of Things technology is proposed. Monitoring systems and slope monitoring projects require low real-time data because most monitoring cycles are long. However, due to the particularity of the monitoring process environment, there are higher requirements for energy saving, scalability, and robustness of wireless transmission networks. RF433MHz technology can meet the problem of wireless transmission in slope monitoring in many aspects such as power consumption, network scalability, network networking capabilities, and operating costs, so it is very suitable for slope monitoring and early warning systems with multiple parameters and multiple measurement points. Through engineering tests, the system works stably and the validity and accuracy of the monitoring data. The researched road slope composite monitoring system based on the Internet of Things technology has certain engineering application value.
Analysis of existing problems and influencing factors of construction industrial engineering quality
Authors: Cheng Wenyi
Published: February 2021

Building industrialization, promote the industrialization of the world architecture development, promoted the pace of urbanization construction, in the aspect of building industrialization in China started late, so under the background of industrialization, in the course of the construction of construction engineering quality management experience a slight lack of current industrial construction project quality management of construction was still in the stage of research and practice, this article mainly through to the building industrialization construction quality has carried on the detailed analysis of existing problems, and combined with the traditional construction project quality management method, analyses the construction quality control factors of industrialization, It will provide some research data for future research on engineering quality control methods.
Research on the Health Detection of Spatial Grid Structures Based on Deep Learning
Authors: Kai SUN , Ping LIU , Ling WANG , Ning XU
Published: February 2021

With the popularization of space grid structure, the health detection of structure is an urgent problem to be solved. According to the distribution law of members and the characteristics of clear force transmission, a grid model with 29 nodes and 76 members is designed. For the model, the response time history curves of nodes are collected when the model is in good condition and some members are damaged, and the curve time history information is taken as the input vector to construct the damage information matrix. The deep learning network is established step by step by using the deep learning algorithm and trained. Through the establishment of a simplified network, the damage location and damage degree of single bar are identified. The results show that the established network can identify the health state of the structure well, and it has reference value for application.
An Application of Image Recognition Technology Based on Deep Learning in Safety Review of Reservoir Dam Metal Structure
Authors: Wang Kai
Published: February 2021

The safety review calculation of the gate is an important job in the safety evaluation of metal structures. In accordance with the requirements of the specification, this paper has developed an intelligent software for metal structures safety review calculation, which can automate the calculation process and generate a review evaluation report. In order to simplify the labor of the manual input of a large number of gate review calculation parameters, this paper used a deep-learning-based image recognition technology to partially realize the collection of the information relevant to the calculation from the drawings of metal structures, laying the foundation for later realization of the fully intelligent gate safety review.
Network distributed information assets detection method based on Artificial Intelligence
Authors: Chen Ze , Liu Weina , Xi Bo , Guo Yuling
Published: February 2021

Proposes a network distributed information assets detection method based on artificial intelligence. Through mining the characteristics of network distributed information assets, scanning information assets in depth, detecting assets, summarizing the characteristics of information assets, and optimizing the depth scanning mode of network information assets, the research goal of rapid and accurate detection of network distributed information assets is realized. The simulation results show that the proposed network distributed information assets detection method based on artificial intelligence has faster detection speed and higher detection accuracy, so as to meet the requirements of large-scale information detection and solve more complex problems.