Autor: Li, Bing - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Determination of the calcium sulfate hemihydrate content by regression analysis using the initial setting time
Autorzy:: Li, Bing
Tematy:: gips
modyfikacja
czas wiązania
analiza regresji
hemihydrat siarczanu wapnia
gypsum
modification
setting time
regression analysis
calcium sulfate hemihydrate; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czytelnia Czasopism PAN
Powiązania:: https://bibliotekanauki.pl/articles/231074.pdf Link otwiera się w nowym oknie
Opis:: In this paper, we randomly select 75 sets data of calcium sulfate hemihydrate (CSH) content and initial setting time, and the traditional test method of CSH and analyses initial setting time was used by complexometric titration. So the close relationship between them was studied in depth, which classification fitting data to be analyzed by regression analysis. The result shows that this regression analysis method can accurately determine CSH content in modified industrial by-product gypsum. The determination method has the advantages of simplification and rapid operation. As well as, the XRF quantitative analytical method was used to test the CSH content, which verified the accuracy of regression analysis method. The results also show that this method has high accuracy, and can simplify the traditional experimental process. The method developed is easier and more convenient and has broad prospects in application.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Anti-periodic solutions for Clifford-valued high-order Hopfield neural networks with state-dependent and leakage delays
Autorzy:: Huo, Nina
Li, Bing
Li, Yongkun
Tematy:: Hopfield neural network
anti-periodic solution
coincidence degree
time-varying delay
sieć neuronowa Hopfielda
stopień koincydencji
opóźnienie czasowo zależne; Pokaż więcej
Wydawca:: Uniwersytet Zielonogórski. Oficyna Wydawnicza
Powiązania:: https://bibliotekanauki.pl/articles/330171.pdf Link otwiera się w nowym oknie
Opis:: A class of Clifford-valued high-order Hopfield neural networks (HHNNs) with state-dependent and leakage delays is considered. First, by using a continuation theorem of coincidence degree theory and the Wirtinger inequality, we obtain the existence of anti-periodic solutions of the networks considered. Then, by using the proof by contradiction, we obtain the global exponential stability of the anti-periodic solutions. Finally, two numerical examples are given to illustrate the feasibility of our results.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Research on the Performance Optimization of Turbulent Self-Noise Suppression and Sound Transmission of Acoustic Windows Made from Functionally Graded Material
Autorzy:: Li, Bing
Zhou, Fu-Lin
Fan, Jun
Wang, Bin
Tan, Liwen
Tematy:: functionally graded material
acoustic window
turbulent self-noise
sound transmission loss
optimization; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Czasopisma i Monografie PAN
Powiązania:: https://bibliotekanauki.pl/articles/31339793.pdf Link otwiera się w nowym oknie
Opis:: For a simplified sonar dome model, an optimization method for internal gradients of functionally graded material (FGM) acoustic windows is proposed in this paper. This method can be used to design optimized FGM acoustic windows with better turbulent self-noise suppression and sound transmission performances. A theoretical model of FGM acoustic windows to evaluate the reduction of self-noise caused by the turbulent boundary layer (TBL) pulsating pressure and the sound transmission loss (STL) is derived through the double Fourier transform and the wavenumber frequency spectrum analysis, respectively, based on the transfer matrix idea and the classical elastic theory. The accuracy of the theory is verified by the finite element results of COMSOL Multiphysics. Utilizing the genetic algorithm (GA) and taking the monotonic gradient as the constraint condition, the internal gradient optimization method of FGM acoustic windows obtains the optimization variables in the Bernstein polynomial when the optimization objective is minimized by iterating the optimization variables in the deviation function represented by the Bernstein polynomial that is introduced in the gradient function. The STL, the turbulent self-noise reduction or a weighting function of the STL and turbulent self-noise reduction of FGM acoustic windows is chosen as the optimization objective. The optimization calculation of the sound transmission or turbulent self-noise suppression performances is carried out for the FRP-rubber FGM (FGM with fiber reinforced plastic (FRP) as the substrate material and rubber as the top material) acoustic window. The optimized results show that both the sound transmission and turbulent self-noise suppression performance are effectively improved, which verifies the effectiveness of the optimization method. Finally, the mechanism of the sound transmission and self-noise suppression characteristics before and after optimization are explained and analyzed based on the equivalent model of graded materials. The research results of this paper provide a reference value for the future design of FGM acoustic windows for sonar domes.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Computed tomography-guided catheter drainage with ozone in management of pyogenic liver abscess tomography-guided catheter drainage with ozone in management of pyogenic liver abscess
Autorzy:: Du, Yong
Zhang, Chuan
Li, Bing
Yang, Han-Feng
Xu, Xiao-Xue
Li, Yang
Liu, Chuan
Wang, Lang
Opis:: Purpose: To compare the treatment efficacy of percutaneous catheter drainage alone to catheter drainage combined with ozone in the management of pyogenic liver abscess (PLA). Material and methods: This prospective study included 85 patients diagnosed with PLA. All patients were randomly divided into two groups: catheter drainage alone (Group I); catheter drainage combined with ozone (Group II). Drainage was considered successful when: 1) the abscess cavities were completely drained, and 2) clinical symptoms were resolved. Kruskall-Wallis nonparametric test was used to compare the success rates, length of stay (LOS), and need of further surgery. A value of p < 0.05 was considered significant for all statistical analyses. Results: In all the patients’ percutaneous catheters were placed successfully under the guidance of computed tomography. All of the patients in Group I (43; 50.6%) were treated with percutaneous catheter drainage alone, while the patients in Group II (42; 49.4%) were treated with PCD combined with ozone. The success rates of Group I and II were 81% and 94%, respectively (p < 0.05). The duration of fever as well as LOS was longer for Group I when compared with Group II (p <0.05). Conclusions: Catheter drainage combined with ozone is an effective and safe treatment in PLA.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 5.

Tytuł:: Study on the Spatial Distribution of Natural Fragments Based on Fractal Model of Fragment Mass Distribution
Autorzy:: Huo, Xian Xu
Li, Wei Bing
Zhu, Jian Jun
Tematy:: fragment spatial distribution
Shapiro equation
fractal model of fragment mass distribution
anti-personnel warhead
numerical simulation; Pokaż więcej
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego
Powiązania:: https://bibliotekanauki.pl/articles/59115339.pdf Link otwiera się w nowym oknie
Opis:: In order to solve the problem of using fragment quantity spatial distribution to describe fragment spatial distribution, this paper proposes a fragment mass probability density model to describe fragment spatial distribution. Applying the idea of stress gradient and velocity gradient grade in the process of explosion, the calculation equation of fragment direction angle at different axial positions of warhead is established. Based on the fractal model of natural fragment mass distribution in the form of Weibull function, a two-dimensional joint probability density model of fragment scattering space angle and fragment mass is established, and the model is verified by tests. The research results show that when the space angle is between 90° and 100°, the theoretical calculation error of fragment mass distribution is 4.3%, and the theoretical calculation error of fragment quantity distribution is 19.4%, compared with the test results. This shows that the fragment mass spatial distribution is more suitable for characterizing the fragment spatial distribution law than the fragment quantity spatial distribution. When considering the characteristics of non-uniform fragment mass formed in different regions of warhead, the prediction accuracy of the fragment mass spatial distribution model established in this paper is 18.2% higher than that of previous models, which can more accurately reflect the fragment spatial distribution law.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: A systematic review and meta-analysis of C-Arm Cone-Beam CT-guided percutaneous transthoracic needle biopsy of lung nodules
Autorzy:: Du, Yong
Zhang, Chuan
Yan, Gao-Wu
Yan, Gao-Wen
Li, Bin-Zhong
Li, Bing
Yang, Han-Feng
Sun, Qin-Quan
Xu, Xiao-Xue
Zhou, Yu
Bhetuwal, Anup
Zeng, Hao
Niu, Xiang-Ke
Li, Li-Fa
Opis:: BACKGROUND: A systematic review and meta-analysis of all available publications was performed to evaluate the diagnostic accuracy of percutaneous transthoracic needle biopsy (PTNB) using a C-Arm Cone-Beam CT (CBCT) system in patients with lung nodules. MATERIAL AND METHODS: Thedatabases of PUBMED, OVID, EBSCO, EMBASE, and China National Knowledge Infrastructure (CNKI) were systematically searched for relevant original articles on the diagnostic accuracy of CBCT-guided PTNB for the diagnosis of nodules in the lungs. Diagnostic indices including sensitivity, specificity, positive likelihood ratio (PLR), negative likelihood ratio (NLR), diagnostic odds ratio (DOR) and diagnostic score (DS) were calculated. Moreover,summary receiver operating characteristic curves (SROC) were constructed with Stata (version 13.0), Rev Man (version 5.3), and Meta-disc (version 1.4) software. Other clinical indices such as incidence of complications were also recorded. RESULTS: Eight studies met the inclusion and exclusion criteria for the meta-analysis. The pooled sensitivity, specificity, PLR, NLR, DOR, DS, and SROC with 95% confidence intervals were 0.96 (0.93-0.98), 1.00 (0.91-1.00), 711.15 (9.48-53325.89), 0.04 (0.02-0.07), 16585.29 (284.88-9.7e+05), 9.72 (5.65-13.78), and 0.99 (0.97-0.99), respectively. The incidence of pneumothorax and hemorrhage was 10-29.27% and 1.22-47.25%, respectively. CONCLUSIONS: CBCT-guided PTNBhas an acceptable rate of complications and is associated with a reasonable radiation exposure. Moreover, it is a highly accurate and safe technique for the diagnosis of lung nodules and can be recommended to be used in routine clinical practice.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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Skocz do pozycji: 7.

Tytuł:: Perspectives on the Open Educational Resources
Autorzy:: Lu, Bing-Yuh
Tung, Ming-Li
Tematy:: life-long learning
open educational resources
classroom
globalization
language; Pokaż więcej
Wydawca:: Wydawnictwo Adam Marszałek
Powiązania:: https://bibliotekanauki.pl/articles/50389659.pdf Link otwiera się w nowym oknie
Opis:: This study introduced the open educational resources (OER) aided learning in a computer aided classroom. The course materials included the OER, composed in English, and a textbook translated into Taiwan’s traditional Chinese. Furthermore, the OER improved students’ conceptual understanding of both language and professional knowledge. Finally, the conceptual color plate analysis was employed to evaluate the related factors among universities, students, and teachers. Based on the statistics of the previous OER studies, it is predictable that OER aided learning may be popular in the future. Besides, the library plays a very important role in life-long learning, and will be crucial in the future because advanced guides and indexing of digital contents and OER can give the self-learner a better tool for life-long learning.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Investigation into the growgth directions of a ductile crack under tensile loading
Autorzy:: Zhang, Xiao--Bing
Li, Jia
Recho, N.
Tematy:: fracture
full elastic--plastic field
crack propagation criteria; Pokaż więcej
Wydawca:: Polskie Towarzystwo Mechaniki Teoretycznej i Stosowanej
Powiązania:: https://bibliotekanauki.pl/articles/279697.pdf Link otwiera się w nowym oknie
Opis:: In this paper, we use an energy variational methodto study the full stress field near a stationary crack in a plane state in a power--law hardening material under mode I liading. Associated with the finite element method the trejectory line fields of the principal stresses and the maximum shear stresses have been drawn in order to determine the crack growth direction. It appears that the crack can propagate along a cleavage band or along a slip band according to the triaxial tensile stress level in the vicnity of the crack. The growth direction of a ductile crack depends on the competition between the stress concentractions along these bands.
W pracy zastosowano metodę wariacji energii do badania pełnego pola naprężeń wokół stacjonarnego pęknięcia w płaski stanie odkształcenia dla materiału o potęgowym wzmocnieniu dla I typu obciążenia. Przy pomocy metody elementów skończonych wyznaczono pola trajektorii naprężeń głównych i maksymalnych naprężeń ścinających w celu określenia kierunku wzrostu szczeliny. Stwierdzono, iż pęknięcie rozwija się wzdłuż pasm rozdzielczości lub pasm ścinania, zgodnie z poziomem trójosiowych naprężeń rozciągających w otoczeniu pęknięcia. Kierunek wzrostu pęknięcia ciągliwego zależy od relacji pomiędzy koncentracjami naprężeń wzdłuż tych pasm.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Calculation and measurement of tide height for the navigation of ship at high tide using artificial neural network
Autorzy:: Li, Q.
Bing-Dong, Y.
Bi-Guang, H.
Tematy:: deep-draft ships
neural network
intelligent navigation
multi-observation stations; Pokaż więcej
Wydawca:: Politechnika Gdańska. Wydział Inżynierii Mechanicznej i Okrętownictwa
Powiązania:: https://bibliotekanauki.pl/articles/258480.pdf Link otwiera się w nowym oknie
Opis:: Accurate tide height is crucial for the safe navigation of large deep-draft ships when they enter and leave the port. We have proposed an accurate forecasting method for the tide heights from the observation data and neural networks, which can easily calculate the tidal window period of large deep-draft ships’ navigation through long channels at high tide. Moreover, an artificial neural network is established for the tide height from the observation of tide heights before their current time node. For an ideal forecast, the neural network was optimized for one year with the tide height data of Huanghua Port. In case of large ships, their tidal characteristics of channels for are complex. A new method is proposed for the observation of multiple stations and artificial neural networks of each observation station. When ships are navigating through the port, the tide height is predicted from the observed data and forecast tide heights of multiple observation stations. Thus, a valid tidal window period is secured when the ships enter the port. Comparative analysis of the ship’s tidal window period with that of the measured one can lead us to conclude that the forecasted data has a strong correlation with the measurement. So, our proposed algorithm can accurately predict the tide height and calculate the node timing when the ship enters and depart the port. Finally, these results can be applied for the safe navigation of large deep-draft ships when the port is at high tide.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 10.

Tytuł:: A study of digital transformation and MSMEs performance from a spatial perspective: Evidence from China
Autorzy:: Zheng, Bing
Yuan, Yuqing
Li, Huizhuan
Jiang, Yihan
Tematy:: digital transformation
double sampling frame
performance analysis
MSMEs; Pokaż więcej
Wydawca:: Uniwersytet Ekonomiczny w Katowicach
Powiązania:: https://bibliotekanauki.pl/articles/18721474.pdf Link otwiera się w nowym oknie
Opis:: Aim/purpose – Not only have micro, small, and medium enterprises (MSMEs) been regarded as a driving force of the national economy, but they have also become important in promoting innovation and entrepreneurship. In general, today’s MSMEs face problems, such as high business costs, insufficient innovation, and inadequate management capabilities, that have all forced the digital transformation of MSMEs. However, in existing studies, the impact of digital transformation on performance is controversial, and the subjects are generally listed companies. In this paper, we have decided to use micro business survey data and analyze them from a spatial perspective to explore how MSMEs’ digital transformation plays a role in influencing performance and the path of its effect. Design/methodology/approach – We use a sampling method with a dual directory-regional sampling frame to investigate MSMEs in Ningbo City, Zhejiang Province, China and then delve into the impact of digital transformation on enterprise performance from a spatial perspective by the spatial weighted logit model. Findings – Hierarchical analysis shows that there is a large room for improvement in the Digital transformation of enterprises. The digitalization level of an enterprise has a positive impact on performance. While from a spatial perspective, the digitalization level of neighboring enterprises has a negative impact on the performance of the enterprise. Path analysis shows that the digital transformation of enterprises can increase innovation, reduce costs, and improve the performance of enterprises. Originality/value – We provide an empirical basis for vigorously promoting the digital transformation of enterprises, jointly building digital parks, and improving enterprise performance by reducing costs and improving efficiency. At the same time, it provides relevant suggestions for digital transformation for manufacturing MSMEs that are hesitant to see or are at a loss in the digital transformation and helps manufacturing MSMEs to achieve cost reduction and increase efficiency.
Dostawca treści:: Biblioteka Nauki

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