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1
Content available remote Bio-inspired mechanics of bottom-up designed hierarchical materials: robust and releasable adhesian systems of gecko
100%
Yao H. , Gao H.
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tom Vol. 55, nr 2
141-150
EN
To explore the basic principles of hierarchical materials designed from nanoscale and up, we have been studying the mechanics of robust and releasable adhesion nanostructures of gecko [1]. On the question of robust adhesion, we have introduced a fractal-like hierarchical hair model to show that structural hierarchy allows the work of adhesion to be exponentially enhanced as the level of structural hierarchy is increased. We show that the nanometer length scale plays an essential role in the bottom-up design and, baring fracture of hairs themselves, a hierarchical hair system can be designed from nanoscale and up to achieve flaw tolerant adhesion at any length scales. For releasable adhesion, we show that elastic anisotropy leads to orientation-dependent adhesion strength. Finite element calculations revealed that a strongly anisotropic attachment pad in contact wit h a rigid substrate exhibits essentially two levels of adhesion strength depending on the direction of pulling.
2
Content available Bio-inspired mechanics of bottom-up designed hierarchical materials: robust and releasable adhesion systems of gecko
100%
Yao H. , Gao H.
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3
Content available remote Some Novel Pythagorean Fuzzy Interaction Aggregation Operators in Multiple Attribute Decision Making
80%
Gao H. , Lu M. , Wei G. , Wei Y.
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2018
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tom Vol. 159, nr 4
385--428
EN
In this paper, we investigate the multiple attribute decision making problems with Pythagorean fuzzy information. Then, we utilize arithmetic and geometric operations to develop some Pythagorean fuzzy interaction aggregation operators: Pythagorean fuzzy interaction weighted average (PFIWA) operator, Pythagorean fuzzy interaction weighted geometric (PFIWG) operator, Pythagorean fuzzy interaction ordered weighted average (PFIOWA) operator, Pythagorean fuzzy interaction ordered weighted geometric (PFIOWG) operator, Pythagorean fuzzy interaction hybrid average (PFIHA) operator, Pythagorean fuzzy interaction hybrid geometric (PFIHG) operator, Pythagorean fuzzy interaction correlate aggregation operators, Pythagorean fuzzy interaction induced aggregation operators, Pythagorean fuzzy interaction induced correlate aggregation operators, Pythagorean fuzzy interactive power arithmetic and geometric aggregation operators. The prominent characteristic of these proposed operators are studied. Then, we have utilized these operators to develop some approaches to solve the Pythagorean fuzzy multiple attribute decision making problems. Finally, a practical example for selecting the service outsourcing provider of communications industry is given to verify the developed approach and to demonstrate its practicality and effectiveness.
4
Upper and lower solutions method for fourth-order periodic boundary value problems
80%
Weng S. , Gao H. , Jiang D. , Hou X.
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tom Vol. 14, nr 1
53-61
EN
The purpose of this paper is to prove the existence of a solution of the following periodic boundary value problem {u(4)(t) = ∫(t, u(t), u" (t), t ∈ [0, 2π] {u(0) = u(2π]), u' (0) = u' (2π), u" (0) = u' (2π), u''' (2π) in the presence of an upper solution β ≤ α, where ∫(t, u, v) satisfies one side Lipschitz condition.
5
Content available Application study on cooperative drainage technology for mining-affected pressure relief gas in overlaying adjacent seams
80%
Wang K. , Zang J. , Zhou A. , Gao H.
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tom Vol. 36, no. 3
385-393
EN
During the mining process of 12# coal seam in Yangquan mine area, gas quantity emitting from overlaying adjacent seams was high and gas concentration in upper corners and return airways of mining faces often exceeded limitation. To solve these problems, through the combination of theoretical study, numerical simulation and on-site observation, the high-low zoning enrichment law of the mining-affected pressure relief gas in overlaying adjacent seams of 12# coal seam was formulated. According to this law, the cooperative drainage technology was proposed, namely arranging the high-located and low-located boreholes to drain the gas respective in high and low enrichment zones. By applying the cooperative drainage technology, the safety production status of mining faces of 12# coal seam in Nanzhuang mine has been significantly ameliorated, advance efficiency, drainage rate and drainage quantity have been improved greatly, carbon emission has been reduced and the environment has been protected, resource utilization has been improved, the service life of the mine will be extended. In a word, good economic, social and environmental benefits have been achieved, meanwhile, a safe, efficient, and sustainable exploitation of the mine has been realized.
PL
Podczas eksploatacji ściany nr 12 w Yangquan zanotowano dużą ilość gazu wydobywającego się z przyległych pokładów węgla. Koncentracja metanu w chodniku nadścianowym bardzo często przekraczała wartości dopuszczalne. Aby rozwiązać te problemy, sformułowano zasadę wysokiego/niskiego odmetanowania dla dekompresji metanu w przyległych do ściany nr 12 pokładach węgla na podstawie symulacji numerycznych oraz obserwacji. W odniesieniu do tej zasady zaproponowano technologię łączonego odprowadzania gazu poprzez otwory wiertnicze zlokalizowane odpowiednio na niższym i wyższym poziomie odpowiednich stref metanowości. Zastosowanie technologii odprowadzania łączonego przyczyniło się do znacznej poprawy bezpieczeństwa produkcji na przodku nr 12 kopalni Nanzhuang, zwiększenia wydajności, prędkości odprowadzania i ilości odprowadzanego gazu, obniżenia emisji dwutlenku węgla oraz lepszej ochrony środowiska, a także lepszego wykorzystania zasobów i wydłużenia okresu eksploatacji kopalni. Krótko mówiąc, uzyskano znaczne korzyści ekonomiczne, społeczne i środowiskowe, przy jednoczesnym zapewnieniu bezpiecznej, wydajnej i zrównoważonej eksploatacji kopalni.
6
Content available EFFECT OF CONE SIZE ON THE BONDING STRENGTH OF BIMETALLIC COMPOSITE PIPES PRODUCED BY DRAWING APPROACH
71%
Gao H. , Zheng M. , Teng H. , Zhao T. , Hu J.
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nr 1
7
Content available remote A Data Dissemination Algorithm using Multi-Replication in Wireless Sensor Networks
71%
Gao C. , Hu X. , Guo L. , Xiong W. , Gao H.
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2013
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tom R. 89, nr 1b
91--93
EN
Many data dissemination techniques have been proposed to facilitate data storage and query processing. In this paper, we propose a Multi-Replication Storage (MRS) algorithm in Wireless Sensor Networks (WSNs). In MRS scheme, sensing data is collected and stored at the home nodes, which form an s-hop dominating set of the whole network. Meanwhile, each home node has some replication nodes, when the home node receives a data, it will send data copies to the replica nodes in order to facilitate data query. So the MRS algorithm can provide timely responses to queries. Moreover, proposed data dissemination scheme also discusses load balance. Analysis and simulations are conducted to evaluate the performance of our MRS algorithm. The results show that the MRS algorithm outperforms the external storage (ES) based scheme, local storage (LS) based scheme and the data-centric storage (DCS) based scheme.
PL
W celu gromadzenia i przeszukiwania danych stosuje się wiele technik rozpraszania danych. W prezentowanym opracowaniu proponujemy zastosowanie w bezprzewodowych sieciach czujnikowych algorytmu MRS (gromadzenie przy pomocy wielokrotnej replikacji).W schemacie MRS dane gromadzone i magazynowane są w węzłach wewnętrznych, które tworzą s-przeskokowy układ obowiązujący w całej sieci. Każdy węzeł wewnętrzny ma kilka węzłów replikacji i, w celu ułatwienia przeszukiwania, kopiuje do nich gromadzone przez siebie dane. Tak więc proponowany schemat rozpraszania może zapewnić przeszukiwanie w odpowiednim czasie. W opracowaniu zbadano również zrównoważenie obciążenia. Przeprowadzono analizę i symulację zaproponowanego algorytmu MRS. Wyniki pokazują, że algorytm MRS przewyższa schematy oparte o gromadzenie zewnętrzne (ES), gromadzenie lokalne (LS) i gromadzenie w centrach danych (DCS).
8
Content available Effect of Cone Size on the Bonding Strength of Bimetallic Composite Pipes Produced by Drawing Approach
71%
Zheng M. , Zhao T. , Gao H. , Teng H. , Hu J.
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tom Vol. 63, iss. 1
451--456
EN
The effect of cone size on interfacial bonding strength of bimetallic composite pipe manufactured by drawing approach is studied on base of the plane strain assumption and ideal elastic-plastic model, a simple expression for the effect of cone size on the bonding strength of bimetallic composite pipes is proposed. The agreement of the predicted results with the experimental results shows the reliability.
9
Bindarit attenuates pain and cancer-related inflammation by influencing myeloid cells in a model of bone cancer
71%
Liu S. , Gao H. , Gao C. , Liu W. , Xing D.
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nr 3
10
Parametric proportional hazards model for mapping genomic imprinting of survival traits
71%
Gao H. , Liu Y. , Zhang T. , Yang R. , Prows D. R.
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nr 1
EN
A number of imprinted genes have been observed in plants, animals and humans. They not only control growth and developmental traits, but may also be responsible for survival traits. Based on the Cox proportional hazards (PH) model, we constructed a general parametric model for dissecting genomic imprinting, in which a baseline hazard function is selectable for fitting the effects of imprinted quantitative trait loci (iQTL) genotypes on the survival curve. The expectation–maximisation (EM) algorithm is derived for solving the maximum likelihood estimates of iQTL parameters. The imprinting patterns of the detected iQTL are statistically tested under a series of null hypotheses. The Bayesian information criterion (BIC) model selection criterion is employed to choose an optimal baseline hazard function with maximum likelihood and parsimonious parameterisation. We applied the proposed approach to analyse the published data in an F2 population of mice and concluded that, among five commonly used survival distributions, the log-logistic distribution is the optimal baseline hazard function for the survival time of hyperoxic acute lung injury (HALI). Under this optimal model, five QTL were detected, among which four are imprinted in different imprinting patterns.
11
Differential responses of two rice varieties to perchlorate stress
71%
Chen G. , He H. , Gao H. , Li H. , Zhang Z.
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nr 1
EN
Two rice varieties, one perchlorate-tolerant (Gannuoxiang, GN) and the other perchlorate-sensitive (IR65598-112-2, IR), were exposed to 20, 200, and 400 mg/kg soil perchlorate to investigate their physiological responses and perchlorate accumulation. It was found that perchlorate decreased leaf chlorophyll content in both rice varieties. The activities of superoxide dismutase (SOD) and catalase (CAT) decreased while peroxidase (POD) increased in both rice varieties under perchlorate stress at tillering stage. Rice variety IR showed earlier physiological response and was more affected by perchlorate than GN. Perchlorate induced physiological response in different ways depending on perchlorate contamination level, rice variety, and growing stage. Perchlorate concentration in leaves was significantly higher than that in roots, stems and seeds. Perchlorate accumulation in IR leaves was higher than GN, but GN stored more perchlorate in its edible portion at low perchlorate level. These results indicated that high sensitivity of the rice variety IR to perchlorate stress might be due to antioxidant enzymes in perchlorate-detoxification and its higher perchlorate accumulation in leaves.
12
Cloning of Hsp21 gene and its expression in Chinese shrimp Fenneropenaeus chinensis in response to WSSV challenge
61%
Gao H. , Lai X. , Kong J. , Wang W. , Meng X. , Yan B. , Cai S.
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nr 2
13
Content available remote Effects of hole-perpendicularity error on joint stiffness of single-lap double-bolt composite joints
61%
Liu X. , Yang Y. , Gao H. , Bao Y. , Li R. , Chen L.
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tom Vol. 65, iss. 2
289--305
EN
To investigate the influence of hole-perpendicularity error on stiffness of single-lap doublebolt composite joints, a finite element model was first created and validated by using the analogical mass-spring based model proposed by McCarthy et al. The model was then modified by introducing hole-perpendicularity error, with which the influences of hole-perpendicularity error, which is represented by hole-titling angle, hole-tilting direction, and bolt torque on the joint stiffness are studied. It is found that the hole-tilting direction causes the joint stiffness to either increase or decrease, which depends on the relation between the hole-tilting direction and the loading orientation. In addition, the hole-tilting angle strengthens the influence of hole-tilting direction and the bolt torque plays the most important role among the three factors in affecting the joint stiffness.
14
Research on migration law of Mn in mudstone floor in the goaf under coupling conditions of seepage and stress
61%
Yang D. , Li J. , Huang Y. , Song T. , Gao H. , Qiao M.
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nr 1
15
Insulin mitigates apoptosis of porcine follicular granulosa cells by downregulating BimEL
61%
Han Y. , Wang S. , Lin L. , Gao H. , Wang Y. , Ji Z. , Zeng S.
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nr 3
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