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    Wyświetlanie 1-7 z 7
    Tytuł:
    Experimental study on deformation and damage evolution of a mining roadway with weak layer rock under compression-shear load
    Autorzy:
    Song, Yimin
    Ren, He
    Xu, Hailiang
    An, Dong
    Powiązania:
    https://bibliotekanauki.pl/articles/2073861.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    szczelinowanie hydrauliczne
    skała
    pękanie skały
    rock burst
    zonal fracturing
    compression-shear load
    interlayer displacement
    digital speckle correlation method
    Opis:
    The structure and load characteristics of the roadway are simplified, and the experimental model of the roadway deformation and damage under compression-shear load is established. The experimental data acquisition system is built with a CCD camera. The digital speckle correlation method is used to calculate the image data of the experimental model. The correspondence between the evolution law of the deformation field, the interlayer displacement and deformation evolution are analysed, including the dynamic characteristic of the roadway surrounding the rock. Research results indicate: (1) The damage peak load of the weak layer structure shows a decreasing trend as the interlayer shear stress increases. As the initially applied shear stress increases, the value of interlayer sliding displacement increases, and the dynamic characteristics become more apparent. (2) In the sub-instability phase of the loading curve, when the surrounding rock slides along the layers under compression-shear load, the stress is re-distributed and transmitted to the deep part of the surrounding rock. Then the surrounding rock of the roadway forms the characteristic of alternating change, between tension to compression. (3) According to the state of dynamic and static mechanics, the deformation evolution of the roadway before the peak load belongs to the static process. Zonal fracturing is part of the transition phase from the static process to the slow dynamic process, and the rockburst damage is a high-speed dynamic process. (4) Under the compression-shear load, due to the weak layer structure of the coal and rock mass, the local fracture, damage, instability and sliding of the surrounding rock of the roadway are the mechanical causes of rockburst. (5) Even if the coal and rock mass does not have the condition of impact tendency, under stress load of the horizontal direction, distribution of large shear stress is formed between layers, and the dynamic damage of the rockburst may occur.
    Źródło:
    Archives of Mining Sciences; 2021, 66, 3; 351--368
    0860-7001
    Pojawia się w:
    Archives of Mining Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Mechanism and optimum pressure for sliding-mode nanogenerator
    Autorzy:
    Yun, Hang
    He, Ren
    Powiązania:
    https://bibliotekanauki.pl/articles/2204139.pdf
    Data publikacji:
    2023
    Wydawca:
    Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
    Tematy:
    triboelectric nanogenerator
    ab initio calculation
    optimum pressure
    recovered energy
    Opis:
    Triboelectric nanogenerator has extensive applicability because of its capability of harvesting mechanical energy and flexible working modes. To research the optimum pressure and improve the recovered energy of the sliding-mode triboelectric nanogenerator, a contact model of the Al/PTFE tribo-pair is studied by ab initio calculation and finite element simulation. The F-atom of PTFE is proved to be the electron accepter and the charges transferred can be predicted by Bader charge analysis. The mathematical relation between interfacial distance, charges transferred and contact pressure can be fitted. By Gauss’s law, the electric field is simulated and the regeneration energy of the sliding-mode triboelectric nanogenerator can be evaluated by the total electric energy and friction loss. Finally, an optimum pressure can be set to the upper or lower limit of working pressure corresponding to larger recovered energy. And less friction coefficient and larger contact area are also effective methods for recovering energy.
    Źródło:
    Polish Journal of Chemical Technology; 2023, 25, 1; 35--39
    1509-8117
    1899-4741
    Pojawia się w:
    Polish Journal of Chemical Technology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation and Characterization of a Novel Coordination Compound [K(18-crown-6)][N(NO2)2]
    Autorzy:
    Lu, Zhimeng
    Ren, Xiaoting
    He, Jinxuan
    Powiązania:
    https://bibliotekanauki.pl/articles/27788036.pdf
    Data publikacji:
    2021
    Wydawca:
    Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
    Tematy:
    low-frequency resonance technology
    [K(18C6)][N(NO2)2]
    coordination compound structure
    Opis:
    Low-frequency resonance technology is a promising technology for mixing or manufacturing energetic materials, and has been a hot topic in the field of material preparation. In this paper, we describe the first use of low-frequency resonance technology for the synthesis of new compounds and for performing innovative research. The coordination compound, [K(18-crown-6)][N(NO2)2] ([K(18C6)][N(NO2)2]), was first prepared by using a conventional slow solvent evaporation method over 10 days. The crystal structure of this compound was characterized by single crystal X-ray diffraction (SXD) and revealed that [K(18C6)][N(NO2)2] belongs to the monoclinic system, in which the space group is P21/c. The main intermolecular interactions in [K(18C6)][N(NO2)2] are the K–O coordination bonds and C–H...O hydrogen bonds. The crystallographic parameters are a = 8.5032(2) Å, b = 14.4060(4) Å, c = 8.1708(2) Å, β = 101.896(2), V = 979.40(4) Å3, Z = 2, ρ = 1.388 g·cm–3. The coordination compound [K(18C6)][N(NO2)2] was then prepared by low-frequency resonance technology in only 65 min. The results of X-ray powder diffraction (PXRD), differential scanning calorimetry (DSC) and infrared spectroscopy (FTIR) showed that low-frequency resonance technology can successfully and efficiently prepare [K(18C6)] [N(NO2)2]. Compared to potassium dinitramide (KDN), [K(18C6)][N(NO2)2] has unique characteristics.
    Źródło:
    Central European Journal of Energetic Materials; 2021, 18, 2; 183--198
    1733-7178
    Pojawia się w:
    Central European Journal of Energetic Materials
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characterization of monochlorobenzene contamination in soils using geostatistical interpolation and 3D visualization for agrochemical industrial sites in southeast China
    Autorzy:
    Ren, L.
    Lu, H.
    He, L.
    Zhang, Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/204614.pdf
    Data publikacji:
    2016
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    soil pollution
    monochlorobenzene
    POPs
    persistent organic pollutants
    geostatistical interpolation
    3D visualization
    Opis:
    Persistent organic pollutants (POPs) originating from agrochemical industries have become an urgent environmental problem worldwide. Ordinary kriging, as an optimal geostatistical interpolation technique, has been proved to be sufficiently robust for estimating values with finite sampled data in most of the cases. In this study, ordinary kriging interpolation integrate with 3D visualization methods is applied to characterize the monochlorobenzene contaminated soil for an agrochemical industrial site located in Jiangsu province. Based on 944 soil samples collected by Geoprobe 540MT and monitored by SGS environmental monitoring services, 3D visualization in terms of the spatial distribution of pollutants in potentially contaminated soil, the extent and severity of the pollution levels in different layers, high concentration levels and isolines of monochlorobenzene concentrations in this area are provided. From the obtained results, more information taking into account the spatial heterogeneity of soil area will be helpful for decision makers to develop and implement the soil remediation strategy in the future.
    Źródło:
    Archives of Environmental Protection; 2016, 42, 3; 17-24
    2083-4772
    2083-4810
    Pojawia się w:
    Archives of Environmental Protection
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The feasibility of using high-resolution ultrasonography to assess ulnar nerve in patients with diabetes mellitus
    Przydatność ultrasonografii wysokiej rozdzielczości w badaniu nerwu łokciowego u pacjentów chorujących na cukrzycę
    Autorzy:
    Chen, Jun
    Wang, Chun-Lei
    Wu, Shan
    He, Shan
    Ren, Jun
    Powiązania:
    https://bibliotekanauki.pl/articles/1033382.pdf
    Data publikacji:
    2017
    Wydawca:
    Medical Communications
    Tematy:
    high-resolution ultrasonography
    Opis:
    Objective: The aim of this study was to investigate the usefulness of high-resolution ultrasonography for the diagnosis of polyneuropathy in diabetes mellitus patients by the examination of the ulnar nerves. Method: We recruited 100 healthy age-matched volunteers (50 women and 50 men) with 200 arms without diabetes or cubital tunnel syndrome as the control group. We assessed the upper limbs of 100 diabetes mellitus patients (45 women and 55 men), 40 of whom had electrophysiologically confirmed diabetic peripheral neuropathy and 60 had no diabetic peripheral neuropathy in the upper limbs. Age, sex, height and weight were recorded and the cross-sectional area of the ulnar nerve was measured at every predetermined site. Results: The cross-sectional area of the ulnar nerve was measured at six sites (mid-humerus, inlet of the cubital tunnel, outlet of the cubital tunnel, upon the medial epicondyle, 6 cm upon the wrist crease and Guyon tunnel). The ulnar nerve in two measuring sites (mid-humerus, upon the medial epicondyle) in the control group showed a statistical difference between men and women (p < 0.05). There was no statistical difference in the cross-sectional area in the control group when dominant and non-dominant arms were compared. The cross-sectional area was larger in the diabetic peripheral neuropathy group in three sites (inlet of the cubital tunnel, outlet of the cubital tunnel, Guyon tunnel) compared with those in the control group. Conclusion: High-resolution ultrasonography may be helpful in the early diagnosis of peripheral neuropathy in diabetic patients.
    Cel: Celem badania było określenie przydatności ultrasonografii wysokiej rozdzielczości w diagnostyce polineuropatii u pacjentów z cukrzycą poprzez badanie nerwu łokciowego. Metoda: Przebadano kończyny górne 100 pacjentów z cukrzycą (45 kobiet i 55 mężczyzn), z których 40 cierpiało na elektrofizjologicznie potwierdzoną obwodową neuropatię cukrzycową, a u 60 nie rozpoznano obwodowej neuropatii cukrzycowej w kończynach górnych. Jako grupa kontrolna w badaniu udział wzięło 100 zdrowych wolontariuszy w podobnym wieku (50 kobiet i 50 mężczyzn), niecierpiących na cukrzycę ani zespół kanału łokciowego (łącznie 200 rąk). Określono wiek, płeć, wzrost i wagę oraz zmierzono pole przekroju poprzecznego nerwu łokciowego w każdym ustalonym miejscu. Wyniki: Pole przekroju poprzecznego nerwu łokciowego zmierzono w sześciu miejscach (środek kości ramiennej, wejście do kanału łokciowego, wyjście z kanału łokciowego, nad nadkłykciem przyśrodkowym, 6 cm ponad nadgarstkiem i kanał Guyona). W grupie kontrolnej wykazano statystycznie istotną różnicę w nerwie łokciowym w dwóch miejscach pomiaru (środek kości ramiennej, nad nadkłykciem przyśrodkowym) pomiędzy mężczyznami a kobietami (p < 0,05). Nie wykazano różnicy statystycznej w polu przekroju poprzecznego w grupie kontrolnej podczas porównywania ręki dominującej i niedominującej. Pole przekroju poprzecznego było większe w grupie z obwodową neuropatią cukrzycową w trzech miejscach (wejście do kanału łokciowego, wyjście z kanału łokciowego, kanał Guyona) w porównaniu z grupą kontrolną. Wniosek: Ultrasonografia wysokiej rozdzielczości może okazać się pomocna we wczesnej diagnostyce neuropatii obwodowej u pacjentów z cukrzycą. Artykuł w wersji polskojęzycznej jest dostępny na stronie http://jultrason.pl/index.php/wydawnictwa/volume-17-no-70
    Źródło:
    Journal of Ultrasonography; 2017, 17, 70; 160-166
    2451-070X
    Pojawia się w:
    Journal of Ultrasonography
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of mixed collectors on quartz-feldspar by fluorine-free flotation separation and their interaction mechanism : a review
    Autorzy:
    Li, Peiyue
    Ren, Zijie
    Xie, Enjun
    Duan, Shutong
    Gao, Huimin
    Wu, Jianxin
    He, Yuhao
    Powiązania:
    https://bibliotekanauki.pl/articles/1446562.pdf
    Data publikacji:
    2021
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    quartz
    feldspar
    crystal structure
    flotation
    mixed collectors
    environmentally friendly
    Opis:
    Quartz and feldspar are usually exist in symbiosis in nature, and they are difficult to be separated effectively by conventional physical methods owing to their similarities in crystal structures and surface characteristics. Flotation is the most resultful method, and especially, flotation with hydrofluoric acid (HF) is the most efficient way. Because HF may cause serious environmental and health problems, the effective and environmentally friendly separation of quartz and feldspar remains a formidable challenge. The crystal structure, surface broken bonds, surface energy, and solid–liquid interface properties of quartz and feldspar are investigated in this paper. In particular, some types of mixed cationic/anion collectors and their interaction mechanism on the quartz and feldspar surfaces with acidic, alkaline, and neutral media in the absence of fluorine are discussed, and the grade and scheme of quartz and feldspar for the practical application are illustrated. This review proposes concrete research approaches and provides perspectives for the advanced processing of quartz and feldspar in an environmentally friendly and economical way.
    Źródło:
    Physicochemical Problems of Mineral Processing; 2021, 57, 4; 139-156
    1643-1049
    2084-4735
    Pojawia się w:
    Physicochemical Problems of Mineral Processing
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effects of nitrogen on growth parameters and photosynthetic characteristics of P. chinense Schneid. Seedlings in three soil types
    Autorzy:
    Wang, Meng-ying
    Wang, Ya-juan
    Ren, Hong-yu
    Yang, Yao
    Gu, Tao
    He, Jing-wen
    Gao, Shun
    Powiązania:
    https://bibliotekanauki.pl/articles/53893751.pdf
    Data publikacji:
    2023
    Wydawca:
    Uniwersytet Warmińsko-Mazurski w Olsztynie / Polskie Towarzystwo Magnezologiczne im. Prof. Juliana Aleksandrowicza
    Opis:
    Soil type and nitrogen (N) are two important factors affecting plant growth and development, and photosynthetic physiological characteristics. However, there are still relatively few studies on the effects of N on P. chinense Schneid. seedlings under different types of soils. In this study, three soil types (red soil, alkaline purple soil, and acidic purple soil) and three N levels (50, 150 and 300 mg/plant) were used to investigate how N levels affected seedling growth, biomass accumulation distribution and photosynthetic characteristics under three soil types. The results showed that N may promote the growth of these seedlings and increase their height and basal stem under three soil types. The stem and leaf biomass, aerial biomass, total biomass, and rootshoot ratio showed significant differences. N increased chlorophyll content in leaves on alkaline purple soil and acidic purple soil, but inhibited chlorophyll synthesis on red soil. Under the same N application, the order for total biomass accumulation in seedlings was alkaline purple soil, red soil, and acid purple soil; for the net photosynthetic rate, it was red soil, acid purple soil, and alkaline purple soil. These results indicate that leaves might elevate the photosynthetic rate by increasing stomatal conductance, intercellular CO2 concentration, and transpiration rate, thereby promoting the growth of seedlings. In addition, soil type and nitrogen had a significant interaction effect on the growth and photosynthetic characteristics of P. chinense Schneid. seedlings. These findings will help screening for suitable soil types and nitrogen application levels for efficient cultivation of P. chinense Schneid. seedlings.
    Źródło:
    Journal of Elementology; 2023, 28, 2; 279-294
    1644-2296
    Pojawia się w:
    Journal of Elementology
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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