Wyniki wyszukiwania - Biblioteka Nauki

1

Modelling and Near-Threshold Computing of Power-Gating Adiabatic Logic Circuits

100%

Hu J. , Chen Q.

Przegląd Elektrotechniczny

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2012

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tom R. 88, nr 7b

277--280

EN

This paper introduces a power-gating scheme appropriate for near-threshold operating of single-phase adiabatic circuits. A transmission gate with MOS bootstrapping scheme is used as the power-gating switch, which is used to reduce energy overhead. CAL (Clocked Adiabatic Logic) circuits are investigated. The analytical model for power-gating adiabatic circuits is constructed, and the energy overhead of the proposed powergating scheme is analyzed in detail. The results show that the proposed power-gating technique is suitable for near-threshold operating.

PL

W artykule wprowadzono schemat bramkowania mocy dla progowej operacji jednofazowych obwodów adiabatycznych. Zaproponowano model analityczny bazujący na układach MOS jako przełącznikach bramkujących.

2

Study on the Properties of Core Spun Yarn and Fabrics of Shape Memory Polyurethane

100%

Jing L. , Hu J.

Fibres & Textiles in Eastern Europe

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2010

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tom Vol. 18, no. 4 (81)

39--42

EN

Core spun yarn with shape memory fibre and cotton were developed using a ring spinning frame and friction spinning machine. Shape memory fabrics were woven from two kinds of shape memory core spun yarns, and the mechanical and shape memory properties of the yarns and fabrics were examined. The yarns have a good weave ability, and the yarns and fabrics have a good shape memory fix and recovery properties. This paper also introduces the application of shape memory yarns and fabrics in protective textiles and compares the shape memory properties of two kinds of shape memory core yarn and woven fabrics weft wise and warp wise.

PL

Opracowano przędze rdzeniowe z udziałem włókien poliuretanowych z pamięcią kształtu i bawełny, z wykorzystaniem przędzarki obrączkowej i frykcyjnej. Stosowano dwa rodzaje przędz rdzeniowych, następnie badano właściwości mechaniczne i pamięć kształtu przędz oraz wykonanych z nich tkanin. Wspomniane przędze nie nastręczają trudności w tkaniu i pozwalają na uzyskanie tkanin o dobrej pamięci kształtu. Artykuł przedstawia zastosowania tkanin i przędz z pamięcią kształtu jako materiałów ochronnych oraz porównuje właściwości dwóch rodzajów przędzy rdzeniowej z pamięcią kształtu i właściwości tkanin w kierunku osnowy i wątku.

3

An Image Based Method for Characterising the Mechanical Behaviours of Fabrics. Part 1, The Measurement of In-plane Tensile Behaviour

100%

Xin B. , Hu J.

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tom Vol. 16, no. 1 (66)

72--75

EN

The characterisation of fabric mechanical properties including tensile, bending, shearing, compressing and fracture was investigated by an image based method. In this paper, an in-plane strain-stress measurement system was built using the Kawabata Evaluation System (KES) attached to a set of image digitalisation and analysis modules. The trajectory tracking method based on image analysis was used to calculate the displacement and distortion of reference points printed on a fabric surface under a certain load, so as to determine the displacement and strain distribution field of the specimen. The two-dimensional displacement distribution field and related parameters were used to define the in-plane deformation of fabrics instead of the traditional one-dimensional strain-stress curve. The relationship between strain values determined by the Kawabata Evaluation System and those obtained by the image-based method was analysed, and the experimental results show that the image-based method is effective and simple to characterise both the global and local strains two dimensionally.

PL

Stosując metodę analizy obrazu badano mechaniczne właściwości tkanin związane z rozciąganiem, zginaniem, ścinaniem ściskaniem i rozrywaniem. W części I przedstawiono system dla pomiaru naprężeń i wydłużeń na płaszczyźnie z zastosowaniem systemu Kawabaty (KES), digitalizacją uzyskanych obrazów i ich analizą. Badano przemieszczenia punktów zaznaczonych na tkaninie w stosunku do punktów odniesienia pod wpływem określonych obciążeń. Zamiast tradycyjnych krzywych naprężenie - przemieszczenie uzyskiwano obrazy pól przemieszczeń i naprężeń na płaszczyźnie badanej próbki tkaniny. Analizowano korelacje uzyskane z porównania metody Kawabaty i analizy obrazu, opracowanej przez autorów. Stwierdzono, że nową metodą można charakteryzować naprężenia i przemieszczenia w dwóch wymiarach na płaszczyźnie tkaniny.

4

Morphogenetic pathway in petiole derived callus of Amorphophallus albus in vitro

100%

Hu J. , Li J.

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nr 3

EN

Two different morphogenetic pathways, adventitious bud and corm-like structure (CLS), were observed on organogenic calli derived from the petioles of Amorphophallus albus in vitro. The organogenic calli was established via culture of petiole segments on Murashige and Skoog (MS) medium supplemented with 1.0 mg l⁻¹ a-naphthaleneacetic acid (NAA) and 1.0 mg l⁻¹ 6-benzyladenine (BA) and subculture of the petiole-derived calli on MS medium with 0.5 mg l⁻¹ NAA and 0.5 mg l⁻¹ BA. These organogenic calli were used to induce morphogenesis via culture on MS medium with various concentrations of NAA and BA. BA alone favoured adventitious bud differentiation (57.0 ± 8.3% at maximum) from the organogenic calli but inhibited CLS formation. In the presence of NAA and BA, both adventitious bud and CLS were observed in a same culture system. The maximum CLS formation (71.2 ± 9.3%) were found on MS medium with 0.5 mg l⁻¹ NAA and 2.0 mg l⁻¹ BA, associated with 26.7 ± 8.6% adventitious bud differentiation. A small part of the adventitious buds developed into normal shoots which needed rooting culture phase to form complete plants. About 80% survival rate was obtained with these plants after transplantation to soil. More than 90% of the CLSs produced complete plants with shoots and root systems, regardless of the rooting media tested. Transplantation of the CLS-derived plants to soil gave 100% survival rate. Histological observations revealed both the two morphogenetic events originated from the meristematic cells located in superficial layers of callus tissue.

5

Marine search and rescue of UAV in long-distance security modeling simulation

80%

Zheng L. , Hu J. , Xu S.

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2017

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tom S 3

192--199

EN

Long-distance safety of Marine search and rescue using drones can improve the searching speed. The current method is based on the long distance security classification of UAV.The degree of accuracy is low. A long-distance security modeling approach based on ArduinoMiniPro’s Marine search-and-rescue applying UAV is proposed. The method puts the fault tree analysis and relevant calculation for risk identification into use. The main factors affecting the safety of unmanned aerial vehicle (UAV) are long-distance searching and rescuing. The experimental results show that the proposed method can effectively build modeling for the long-distance safety of the Marine search and rescue UAV.

6

Loureirin B inhibits the proliferation of hepatic stellate cells and the Wnt/β-catenin signaling pathway by regulating miR-148-3p

80%

Hu J. , Zhang R. , Tang M. , Li Y.

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tom 23

EN

Background: We investigated the activity of loureirin B against liver fibrosis and the underlying molecular mechanisms. Methods: Hepatic stellate cells (HSCs) from Sprague-Dawley rats were treated with different concentrations of loureirin B. We used the MTT assay to determine HSC proliferation, flow cytometry to analyze apoptosis, and western blot to determine the expressions of Bax, Bcl-2, Wnt1 and β-catenin. Real-time PCR was used to determine the expressions of Wnt1 and miR-148-3p. Results: The MTT assay showed that loureirin B treatment significantly inhibited the proliferation of HSCs in time- and dose-dependent manners. Loureirin B significantly promoted the apoptosis of HSCs, increased the expression of Bax and decreased the Bcl-2 level. Western blot analysis showed that the expressions of Wnt1 and β-catenin were obviously lower in the loureirin B treatment group than in the control group. We also found that loureirin B could decrease the Wnt1 mRNA level and increase miR-148-3p expression. Knockdown of miR-148-3p using inhibitor could reverse the effects of loureirin B on the proliferation and apoptosis of HSCs and the expressions of Bax, Bcl-2, Wnt1 and β-catenin. Conclusion: Our results suggest that loureirin B inhibited the proliferation and promoted the apoptosis of HSCs, and suppressed the Wnt/β-catenin signaling pathway via regulation of miR-148-3p.

7

Model-building adaptive critics for semi-Markov control

80%

Gosavi A. , Murray S. , Hu J. , Ghosh S.

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tom Vol. 2, No. 1

43--58

EN

Adaptive (or actor) critics are a class of reinforcement learning algorithms. Generally, in adaptive critics, one starts with randomized policies and gradually updates the probability of selecting actions until a deterministic policy is obtained. Classically, these algorithms have been studied for Markov decision processes under model-free updates. Algorithms that build the model are often more stable and require less training in comparison to their model-free counterparts. We propose a new model-building adaptive critic, which builds the model during the learning, for a discounted-reward semi-Markov decision process under some assumptions on the structure of the process. We illustrate the use of our algorithm with numerical results on a system with 10 states and a real-world case-study from management science.

8

Numerical study of stall inception in a transonic axial compressor rotor based on the throttle model

80%

Zhu X. , Liu B. , Hu J. , Shen X.

Journal of Theoretical and Applied Mechanics

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2015

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tom Vol. 53 nr 2

307--316

EN

The goal of the current paper is to investigate inner flow behavior on stall inception in a transonic compressor rotor. The stall inception process is numerically carried out by unsteady 3-D simulations based on the throttle model. The current study shows that stall starts from the tip of the blade, and stall cell extends to the axial, circumferential and radial directions. Through the comparison of flow transition characteristics at different flow rate conditions, the interface between the incoming flow and tip clearance flow shifts forward to the upstream as the mass flow decreases. Eventually, the shock detaches from the blade leading edge, and tip clearance flow spills into the adjacent blade passage, thus stall happens in the affected blade passages.

9

The identification and characterization of a testis-specific cDNA during spermatogenesis

80%

Chen Y. , Hu J. , Song P. , Gong W.

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nr 1

EN

Using bioinformatics and experimental validation, we obtained a cDNA (named srsf) which was exclusively expressed in the mouse testes. RT-PCR analysis showed that srsf mRNA was not expressed in the gonad during the sex determination period or during embryogenesis. In developing mouse tests, srsf expression was first detected on post-natal day 10, reached its highest level on day 23, and then reduced to and remained at a moderate level throughout adulthood. In situ hybridization analysis demonstrated that srsf mRNA was expressed in pachytene spermatocytes and round spermatids in the testes. The predicted protein contains one RNA-binding domain (RBD) and a serine-arginine rich domain (RS), which are characterized by some splicing factors of SR family members. These findings indicate that srsf may play a role during spermatogenesis.

10

Comparative Effects of Aquaculture and Water Level Fluctuations on Macroinvertebrate Communities in Three Gorges Reservoir, China

71%

Chi S. , Zheng Z. , Zhang Z. , Hu J. , Zheng J. , Zhao X. , Hu J. , Dong F. , Peng J.

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tom Vol. 65, nr 4

390--404

EN

In this study, the comparative effects of the two disturbances (aquaculture and water level fluctuations) on macroinvertebrate communities were explored in two waterbodies connected with the reservoir system of Three Gorges Reservoir (TGR) in China. One water body called Gaoyang Bay which suffered organic pollution from intensive aquaculture. Another named Hanfeng Lake, where the effects of water-level fluctuations are obvious. The results showed that aquaculture could significantly affect the chemical forms of nutrients, decrease the α-diversity and increase the β-diversity of macroinvertebrates although the communities in the treatment area in Gaoyang Bay were not fundamentally changed comparing to the control area in the same bay. The densities of macroinvertebrates in the treatment area were significantly lower than that of the control area. The composition of functional feeding groups in the treatment area was close to that in Hanfeng Lake, but obviously different from that in the control area in Gaoyang Bay and the collectors and predators dominated the communities in this control area with the highest percentages. Although water-level fluctuations had negative effects on the communities by decreasing the α-diversity and increasing the β-diversity, which were confirmed by the values of Simpson index, Shannon-Wiener index and Harrison's index in the control area of Gaoyang bay and Hanfeng Lake, the adverse effects were relative low compared to aquaculture. In the bays of TGR, the small-scale disturbance (aquaculture activities) had more significant negative effects compared to the big-scale disturbance (water-level fluctuations related to dam operation of TGR).

11

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

12

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.

13

A new anti-counterfeiting method: fluorescent labeling by safranine T in tobacco seed

71%

Guan Y. , Hu J. , Li Y. , Ma W. , Zheng Y.

Acta Physiologiae Plantarum

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2011

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tom 33

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nr 4

EN

Counterfeit seeds cause a large loss in seed industry and crop production. Present study was undertaken to find a new anti-counterfeiting technology by labeling seeds with a fluorescent compound, safranine T (ST). Response surface analysis (RSA) experiment with two factors (ST concentration and seed soaking time) of 14 combinations was performed to investigate the ST effects on seed vigor and fluorescence showing in seedlings of two tobacco varieties, MS Yunyan 85 and Honghua Dajinyuan. After soaking in ST solutions, tobacco seeds were germinated for 16 days, then the germination index (GI), vigor index (VI), length of roots and shoots were determined. The optimum combinations of ST concentration and soaking time on GI, VI and length of shoots and roots were 0.57–0.69 mg/ml and 6.77–9.34 h for MS Yunyan 85 and 0.51–0.80 mg/ml and 5.81–7.39 h for Honghua Dajinyuan, respectively. Meanwhile, tobacco seedlings, treated with ST solutions from 0.3 to 1.5 mg/ml showed obviously fluorescence under illumination of green light. It suggests that soaking tobacco seeds in safranine T solution of suitable concentration can be used as a labeling technique for anti-counterfeiting in tobacco seeds.

14

miR-3188 Regulates proliferation and apoptosis of granulosa cells by targeting KCNA5 in the polycystic ovary syndrome

71%

Zhou S. , Xia L. , Chen Y. , Guo W. , Hu J.

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nr 1

15

Redox-mediated regulation of wheat seed dormancy revealed through modification-specific proteomics

71%

Bykova N. , Hoehn B. , Rampitsch C. , Hu J. , Fan T.

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nr 2

16

Adsorption kinetics of fluoride on bone char and its regeneration

71%

Hu J. , Wu D. , Rao R. , Liu R. , Lai W.

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tom Vol. 43, nr 3

93--112

EN

The adsorbent of bone char (BC), produced from the pyrolysis of crushed animal bones, was dominated by the mesopores of the Brunauer Emmett Teller (BET) surface area. The optimal condition for defluoridation with BC was a pH level near 5.0. Chloride and nitrate ions could increase fluoride adsorption capacity in contrast with the effect of sulfate and carbonate ions. The interchangeability between fluoride and hydroxyl groups on BC sorbent was proved by the Fourier transform infrared spectroscopy. Langmuir equation had a better correlation coefficient than the Freundlich equation at various temperatures. Thermodynamic parameters such as Delta G degrees, Delta H degrees, Delta S degrees, Ea and S*, have been calculated to describe the nature of fluoride adsorption onto BC. Negative Delta G degrees and Delta H degrees values at various temperatures indicate a spontaneous process, and its exothermic effect, respectively. However, a positive Delta S degrees value represents an increasing process for entropy. The E-a and S* values ranging from 5 to 40 kj.mol-1 and 0 to 1, respectively, demonstrated that the adsorption is dominated by physical process, although the adsorption kinetic process was involved external diffusion, intraparticle diffusion and chemical reaction equilibrium stage. A high concentration of NaOH solution increases efficiency of removing adsorbed F- ions from the BC surface.

17

A velocity measurement method based on scaling parameter estimation of chaotic system

61%

Liu L. , Hu J. , He Z. , Han C. , Li H. , Li J.

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tom Vol. 18, nr 2

275-281

EN

In this paper, we propose a new method of measuring the target velocity by estimating the scaling parameter of a chaos-generating system. First, we derive the relation between the target velocity and the scaling parameter of the chaos-generating system. Then a new method for scaling parameter estimation of the chaotic system is proposed by exploiting the chaotic synchronization property. Finally, numerical simulations show the effectiveness of the proposed method in target velocity measurement.

18

Water-exit process modeling and added-mass calculation of the submarine-launched missile

61%

Yang J. , Feng J. , Li Y. , Liu A. , Hu J. , Ma Z.

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2017

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tom S 3

152--164

EN

In the process that the submarine-launched missile exits the water, there is the complex fluid solid coupling phenomenon. Therefore, it is difficult to establish the accurate water-exit dynamic model. In the paper, according to the characteristics of the water-exit motion, based on the traditional method of added mass, considering the added mass changing rate, the water-exit dynamic model is established. And with help of the CFX fluid simulation software, a new calculation method of the added mass that is suit for submarine-launched missile is proposed, which can effectively solve the problem of fluid solid coupling in modeling process. Then by the new calculation method, the change law of the added mass in water-exit process of the missile is obtained. In simulated analysis, for the water-exit process of the missile, by comparing the results of the numerical simulation and the calculation of theoretical model, the effectiveness of the new added mass calculation method and the accuracy of the water-exit dynamic model that considers the added mass changing rate are verified.

19

Stability control of propeller Autonomous Underwater Vehicle based on combined sections method

61%

Qi D. , Feng J. , Liu A. , Hu J. , Xu H. , Li Y. , Ashraf M. A.

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tom S 1

157--162

EN

Learning from the motion principle of quadrotor, a symmetric propeller AUV, which has small size and low velocity is designed. Compared with the AUV equipped with rudders, it has better maneuverability and manipulation at low velocity. According to the Newton-Euler method, the 6 DOF kinematic model and dynamic model of the propeller AUV are established. A stability controller that consists of 3 different PID controllers is designed. It makes the depth and attitude angle as trigger conditions, and the relevant controller is chosen in different moving process. The simulation experiments simulate ideal motion state and disturbed motion state, and experiments results show that the stability controller based on combined sections method can make the best of mature technology of PID, and meet the control requirements in different stages. It has a higher respond speed and accuracy, improving the stability of the propeller AUV under the disturbance of complex ocean currents.

20

Factors regulating the compositions and distributions of dissolved organic matter in the estuaries of Jiaozhou Bay in North China

61%

Hu J. , Zou L. , Wang J. , Ren Q. , Xia B. , Yu G.

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nr 1