Wyniki wyszukiwania - Biblioteka Nauki

1

Prevalence of avian Chlamydophila psittaci in China

100%

Yang J. , Yang Q. , Yang J. , He C.

Bulletin of the Veterinary Institute in Puławy

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2007

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tom 51

|

nr 3

EN

Examinations were carried out in 46 intensive farms in northern China to investigate avian Chlamydophila psittaci. Five hundred and twenty-five avian sera were selected for examining antibodies to C. psittaci by ELISA. One hundred and fifty-five clinical samples from throat swabs and oviduct tissues were tested for the presence of chlamydial antigen using IDEIA™ PCE chlamydia dual amplification immunoassay, and 60 samples were tested by ompA gene-based PCR. C. psittaci antibodies were detected in 387 (77.8%) out of 525 serum samples, with seroprevalences ranging from 50% to 100%. Among the tested samples, 98/150 (65.3%) in broilers, 173/210 (82.3%) in ducks, and 116/165 (70.3%) in laying hens were detected to be positive, respectively. Using PCE-ELISA test kits, in 91 out of 155 clinical samples the presence of antigen was confirmed, while 64 samples were negative. Forty-three PCR's were tested as positive out of 60 samples, while 17 samples were confirmed to be negative. Both higher positive antibodies and the presence of antigens were found in avian flocks associated with typical clinical signs suggestive of chlamydiosis. This study showed a severe prevalence of C. psittaci among different species of domestic birds in China.

2

Microbial communities and relationship with biofilm spatial distributions in subsurface wastewater infiltration systems

89%

Zhang L. , Yang J.

Environment Protection Engineering

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2016

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tom Vol. 42, nr 3

55--69

EN

A pilot-scale subsurface wastewater infiltration system (SWIS) was designed for the treatment of polluted river water. The components of microbial communities have been identified and characterized and their dependences on some indicators of biofilm formation in the SWIS have been determined. The average efficiencies of COD, TN and removal were 43.3%, 28.8% and 79.6%, respectively. According to the denaturing gradient gel electrophoresis (DGGE) profile, high intensity and uniform bands were generated, indicating an abundant microbial community in each layer of the SWIS. Furthermore, the Shannon index analysis showed high correlation to the spatial distribution of microbial communities as well as the quantity of biofilm in each sample, which were characterized by measuring volatile suspended solids (VSS), phospholipids, proteins and polysaccharides. Sequencing of partial 16S rRNA gene fragments revealed that the composition of the total bacterial communities was dominated by Alphaproteobacteria, Gammaproteobacteria, Deltaproteobacteria, Pseudomonas, Bacillus, Flavobacteriaceae, TM-7, and other uncultured bacteria. These bacteria may contribute to nutrient removal in SWIS. +4 NH –N

3

Experimental design of oily bubbles in oxidized coal flotation

89%

Xia W. , Yang J.

Gospodarka Surowcami Mineralnymi

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2013

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tom T. 29, z. 4

129--135

PL

Węgiel kamienny jest bardzo trudno wzbogacalny w procesie konwencjonalnej flotacji z zastosowaniem odczynników (kolektorów) olejowych. Badania miały na celu zaprojektowanie procesu flotacji, nazywanej flotacją olejową, do zwiększenia efektywności wzbogacania utlenionego węgla. Opisano proces flotacji olejowej. Badania dotyczyły porównania flotacji olejowej i konwencjonalnej do wzbogacania utlenionego węgla. Niektóre właściwości utlenionego węgla są podobne do właściwości węgla brunatnego. Odczynniki flotacyjne (kolektory) mają wielki wpływ na proces utlenionego węgla. Flotowalność utlenionego węgla z Taixi (Chiny) może być poprawiona przez aktywację powierzchni bądź rozdrabnianie węgla. Wstępna obróbka mikrofalowa może zwiększyć hydrofobowość węgla utlenionego poprzez zmniejszenie zawartości wilgoci w węglu utlenionym. Wyniki pokazują, że flotacja z pęcherzykami oleistymi jest bardziej efektywna, gdyż uzyskuje się substancję organiczną (koncentraty węgla) o wyższej zawartości substancji palnych niż w konwencjonalnym procesie flotacji. Wskaźnik efektywności procesu przy zastosowaniu flotacji olejowej jest również wyższy niż przy zastosowaniu konwencjonalnej flotacji.

EN

Oxidized coal is difficult to float using oily collectors in the conventional flotation process. This study was aimed at designing the flotation process, namely the oily bubble flotation process, to float oxidized coal efficiently. The flotation process using oily bubbles is thoroughly described. The study compared using oily bubbles and air bubbles to float oxidized coal. Some properties of oxidized coal are similar to lignite. Therefore, oxidized coal should also be recovered efficiently. The flotation collectors have a great effect on the flotation process of oxidized coal. The floatability of Taixi oxidized coal can be improved by surface activation or grinding. The microwave pretreatment can improve the hydrophobicity of oxidized coal by decreasing the moisture content of oxidized coal. The flotation results show that the oily bubble flotation process can obtain higher combustible matter recovery than the conventional flotation process. The flotation efficiency index using oily bubbles is also higher than that using air bubbles.

4

The influence of hydraulic loading on biofilm properties in a subsurface wastewater infiltration system

89%

Zhang L. , Yang J.

Archives of Environmental Protection

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2016

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tom Vol. 42, no. 4

70--79

EN

In this study, a pilot-scale subsurface wastewater infiltration system (SWIS) was deployed to study landscape water treatment. The goal of the study was to investigate the effects of hydraulic loading on pollutant removal and the spatial distribution of biofilm properties in SWIS. Results showed that the efficiencies of chemical oxygen demand (COD), total nitrogen (TN) and total phosphorus (TP) removal degraded as hydraulic loading increased. Furthermore, quantities of the biofilm properties parameter s increased with the hydraulic loading. Polysaccharide and protein levels ranged from 560 to 1110 μg/g filler and 60 to 190 μg/g filler, respectively, at a hydraulic loading of 0.2 m/d. At a hydraulic loading of 0.4 m/d, the quantities of polysaccharide and protein ranged from 1200 to 3300 μg/g filler and 80 to 290 μg/g filler, respectively. Biofilm intensity and biofilm activity per unit weight decreased with the increase in hydraulic loading.

5

Existence of critical elliptic systems with boundary singularities

89%

Yang J. , Zhou Y.

Opuscula Mathematica

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2013

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tom Vol. 33, no. 2

373--390

EN

In this paper, we are concerned with the existence of positive solutions of the following nonlinear elliptic system involving critical Hardy-Sobolev exponent [formula] where N ≥4 and Ω is a C1 bounded domain in RN with [formula].The case when 0 belongs to the boundary of Ω is closely related to the mean curvature at the origin on the boundary. We show in this paper that problem (*) possesses at least a positive solution.

6

Existence and asymptotic behavior of solutions for hénon type equations

89%

Long W. , Yang J.

Opuscula Mathematica

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2011

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tom Vol. 31, no. 3

411-424

EN

This paper is concerned with ground state solutions for the Hénon type equation [formula] in Ω, where Ω = Bk(0, 1) × Bn-k(0, 1) ⊂ Rn and x = (y, z) ∈ Rk × Rn-k. We study the existence of cylindrically symmetric and non-cylindrically symmetric ground state solutions for the problem. We also investigate asymptotic behavior of the ground state solution when p tends to the critical exponent [formula].

7

Morphology, biometry and distribution of Difflugia biwae Kawamura, 1918 [Protozoa: Rhizopoda]

89%

Yang J. , Shen Y.

Acta Protozoologica

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2005

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tom 44

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nr 2

8

Three dimensional finite element analysis of a novel osteointegrated dental implant designed to reduce stress peak of cortical bone

71%

Zheng L. , Yang J. , Hu X. , Luo J.

Acta of Bioengineering and Biomechanics

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2014

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tom Vol. 16, no. 3

21--28

EN

A new type of dental implant was designed as multi-component mainly including inset and abutment between which a gap was introduced to guide the force to transmit from the cancellous bone to cortical bone, with the intention to lower the stress peak at cortical bone. By the way of finite element analysis (FEA) associated with advanced computer tomography (CT) and 3D model reconstruction technology to construct precise mandible model, biomechanical aspects of implant were investigated. Compared with traditional implant that created stress dominantly at cortical bone, stress peak at the implant/bone interface in the cervical cortex decreased sharply (about 51%) for new type of implant. Furthermore, varying implant shape and gap dimensions to optimize the design of this new implant was performed. Optimization results revealed that: 1) screwed cylindrical implant is superior to tapered, stepped and smooth cylindrical implant in effectively decreasing the stress peak of bone; 2) deepening and widening gap would contribute to the decline of stress peak, but at the cost of break and destruction of the inset; 3) suitable gap size with the depth of 7mm and width of 0.3mm would be applicable. This work may provide reference forclinical application of dental implant.

9

Real-time face detection and pose estimation for driver monitoring

71%

Guo Z. , Yan Y. , Hua J. , Yang J.

Image Processing & Communications

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2006

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tom Vol. 11, no 2

83-96

EN

For a driver monitoring system, one of the most important problems to solve is face detection rapidly. This paper presents an efficient approach to achieve fast and accurate face detection in gray level videos. Candidates of face at different scales are selected by finding regions based on Mask Transform (MT). To obtain real one, all the face candidates are then verified by using support vector machines (SVMs) based on Multi-scale 2D Walsh-Hadamard features. Head pose is estimated on the basis of accurate face detection. At last, we analyzed the head pose by a kind of Bilateral-projection Matrix Principle Component Analysis (BMPCA) algorithm proposed. Experimental results on many videos show that the algorithm can detect driver's face rapidly and estimate the head pose accurately. The proposed method is robust to deal with illumination changes, glasses wearing and different head pose with moderate rotations. Experimental results demonstrate its effectiveness.

10

Polybrominated diphenyl ethers (PBDEs) in sediment and fish tissues from Lake Chaohu, central eastern China

71%

Yang S. , Fu Q. , Teng M. , Yang J.

Archives of Environmental Protection

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2015

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tom Vol. 41, no. 2

12--20

EN

Polybrominated diphenyl ethers (PBDEs) levels in environmental media have increased over the last 20-25 years in the world. In aquatic environments PBDEs were found to be accumulated along food chain and Endocrine disruptors toxicity. In this study PBDEs were investigated in sediment and fish tissues from Lake Chaohu in central eastern China. There were 10 PBDEs congeners detected out of all 41 PBDEs. BDE-47 was of the highest with 5.17 ng/g in sediment and 58.47 ng/g in fish. PBDEs were evenly distributed across the surface sediment in the whole lake. It implied that the main source of PBDEs may not be an inflow river like Nanfei. Tissue distribution patterns of PBDEs in four fish species were in the order of BDE-47 > BDE-99 > BDE-100 > BDE-66 > BDE-138 > BDE-183 > BDE-154 > BDE-153. Octa- and deca-BDEs were below the detection limit. The concentrations of all PBDE congeners were higher in gills, livers, and kidneys than those in muscles and adipose tissue. Furthermore, PBDEs in different tissues had some different distribution patterns with fish size. Those discrepancies appeared to be correlated with the PBDEs pollution fluxes varying with the change of the year and their metabolism divergences in fish tissues.

11

The demand analysis of oceanic T-S-V 3D reconstruction on wide-swath SSH data features based on ROMS and 4DVAR

71%

Zhou C. , Zhang J. , Yang J. , Cao L.

Oceanologia

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2020

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tom 62

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nr 3

12

Iterative sliding mode observer for sensorless control of five-phase permanent magnet synchronous motor

71%

Yang J. , Dou M. , Zhao D.

Bulletin of the Polish Academy of Sciences. Technical Sciences

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2017

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tom Vol. 65, nr 6

845--857

EN

Due to the star connection of the windings, the impact of the third harmonic which does not exist in three-phase permanent magnet synchronous motor (PMSM) cannot be ignored in five-phase PMSM. So the conventional sensorless control methods for three-phase PMSM cannot be applied for five-phase PMSM directly. To achieve the sensorless control for five-phase PMSM, an iterative sliding mode observer (ISMO) is proposed with the consideration of the third harmonic impact. First, a sliding mode observer (SMO) is designed based on the fivephase PMSM model with the third harmonic to reduce the chattering and obtain the equivalent signal of the back electromotive force (EMF). Then, an adaptive back EMF observer is built to estimate the motor speed and rotor position, which eliminates the low-pass filter and phase compensation module and improves the estimation accuracy. Meanwhile, by iteratively using the SMO in one current sampling period to adjust the sliding mode gains, the sliding mode chattering and estimation errors of motor speed and rotor position are further reduced. Besides, the stability of the SMO and the adaptive back EMF observer are demonstrated in detail by Lyapunov stability criteria. Experiment results verify the effectiveness of the proposed observer for sensorless control of five-phase PMSM.

13

Synthesis of PVDF/SBT composite thin films by spin coating technology and their ferroelectric properties

71%

Chen C. , Hu P. , Yang J. , Liu Z.

Materials Science Poland

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2016

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tom Vol. 34, No. 3

650--654

EN

Ferroelectric composite thin films of x-SBT/PVDF with different SBT content (weight ratios of SBT to PVDF, x = 0 %, 5 %, 10 %, 15 %, 20 %) were prepared by spin-coating method. The crystal structures of x-SBT/PVDF films were analyzed by X-ray diffraction (XRD) measurements and Fourier transform-infrared spectroscopy (FT-IR), respectively. Experimental results demonstrated that both α, β-phases PVDF and the layered perovskite SBT co-existed in the x-SBT/PVDF samples. With an increase of SBT content in the x-SBT/PVDF thin films, both the dielectric constant and the saturated polarization were also increased, compared with those of pure PVDF thin film. More importantly, when the SBT content in the x-SBT/PVDF thin films was larger than 15 %, the coercive field of x-SBT/PVDF thin films was also decreased.

14

Investigation of Chest Injury Mechanism Caused by Different Seatbelt Loads in Frontal Impact

71%

Xiao S. , Yang J. , Crandall J. R.

Acta of Bioengineering and Biomechanics

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2017

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tom Vol. 19, no. 3

53--62

EN

The purpose of this quantitative study is to investigate the differences of the injury mechanism caused by two different types of seatbelts loads on the occupant chest. Methods: The finite element analysis is employed to compare the different responses of the human body model, including the comparison of kinematics, chest accelerations, seatbelt forces and chest injury outcomes regrading chest deflections and rib fractures. Results: The calculated rib strain/stress from simulations in force-limiting seatbelt are higher than that in the regular seatbelt. The forward movement and torso twist are both great in simulations with force-limiting seatbelt. Meanwhile, there are obvious differences in the injury outcomes of chest deflections and rib fracture risks under the different seatbelt loads. Conclusion: Results indicate the chest deflections and rib fracture risks are negatively correlated under the load of the force-limiting seatbelt, However, they are positively correlated to and determined by the seatbelt peak load of the regular seatbelt. This paper can provide a reference for study of the chest injury mechanism and the protection efficiency of seatbelt.

15

Transverse vibration of papermaking felt

71%

Zheng P. , Ding X. , Yang J. , Chen R.

Fibres & Textiles in Eastern Europe

|

2010

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tom Vol. 18, no. 3 (80)

106--108

EN

The papermaking felt of high-speed papermaking machine vibrates seriously in a transverse direction. In this study, the transverse vibration of papermaking felt was analysed mechanically with respect to flexural rigidity, and a model was developed. The analytical resolution is obtained by the separation variable method. The result shows that it is a sinusoidal steady-state response. The natural frequency is calculated by the principle of free vibration. The flexural rigidity and density of papermaking felt are the main factors influencing its natural frequency. The validity of the model is verified theoretically and experimentally. The amplitude of the transverse vibration was tested by an optical noncontact measuring system. The amplitude-frequency characteristic curve shows that the natural frequency measured agrees well with the theoretical one.

PL

Filc suszący w maszynach papierniczych o dużej prędkości produkcyjnej wykazuje znaczne wibracje w kierunku poprzecznym do przebiegu formowanej taśmy papieru. Badano poprzeczne drgania w maszynach papierniczych analizując zależności mechaniczne z uwzględnieniem sztywności zginania i opracowano model matematyczny. Analityczne rozwiązanie zostało uzyskane metodą separacji zmiennych. Wyniki wskazują, że otrzymuje się sinusoidalny stan ustalony jako odpowiedz układu na wystąpienie zakłócenia. Częstotliwość drgań własnych obliczono na podstawie zależności opisanych dla drgań swobodnych. Głównymi czynnikami wpływającymi na częstotliwość drgań własnych są sztywność zginania i gęstość filcu suszącego. Prawidłowość modelu została zweryfikowana teoretycznie i eksperymentalnie. Amplitudę drgań poprzecznych badano doświadczalnie za pomocą bezdotykowego układu optycznego. Charakterystyki amplitudowo-częstotliwościowe układu wskazują, że pomierzona częstotliwość drgań własnych jest zgodna z obliczeniami teoretycznymi.

16

Effects of gender and recurrent low back pain on lifting style

71%

Haddas R. , Yang J. , Sizer P.

Central European Journal of Sport Sciences and Medicine

|

2015

|

tom 11

|

nr 3

17

1H NMR-based metabolic profiling of urine from mice fed Lentinula edodes-derived polysaccharides

71%

Xu X. , Yang J. , Ning Z. , Zhang X.

Polish Journal of Food and Nutrition Sciences

|

2018

|

tom 68

|

nr 3

EN

A heteropolysaccharide, named L2, from Lentinula edodes has been proved to possess immunostimulating and anti-ageing activities in previous studies, but its acting mechanism was not completely understood. In this study, 1 H NMR spectroscopy approach was employed to investigate the metabolic profi les of the urine from adult mice after L2 intervention. Using principal component analysis (PCA) and partial least squares-discriminate analysis (PLS-DA), 22 potential biomarkers were found to be mainly involved in some metabolic pathways: amino acid metabolism, energy metabolism, lipid metabolism, tricarboxylic acid (TCA) cycle, urea cycle and gut microbiota metabolism. Among them, the signifi cantly altered metabolites include: elevated glutamate (75%) and creatine (64%); decreased proline (65%), betaine (58%), fucose (63%) and dimethylamine (59%). In conclusion, the present data is helpful to understand the mechanisms related to previously confi rmed immunomodulation and anti-aging effects of L2, and provide valuable information for mining new functions of L2.

18

Effects of soil compaction and tillage practices on carbon dioxide efflux in northeast China: evidence from an incubation study

71%

Chen X. , Yang J. , Liang A. , Zhang X.

Polish Journal of Environmental Studies

|

2016

|

tom 25

|

nr 4

EN

Limited information is available for how soil compaction affects carbon dioxide (CO2) efflux under different tillage systems. To improve understanding of the effects of compaction and tillage on soil CO2 efflux, an incubation study consisting of no tillage (NT), moldboard plow (MP), and ridge tillage (RT) was conducted to explore the relationships between CO2 efflux and bulk density, as well as pore size distribution under different levels of bulk densities, and the thresholds of bulk density and the volume of pore size above which CO2 efflux were affected in northeast China. Results showed that there was a significantly negative correlation (r = -0.990, p<0.05; r = -0.986, p<0.05; and r = -0.992, p<0.01, respectively, for NT, MP, and RT) between CO2 efflux and bulk density, whereas the correlation was significantly positive (r ranges from 0.75 to 0.85, p<0.05 for each tillage practice under bulk densities of 1.0-1.6 g/cm3) for the volume of small macropores (30-100 μm). The critical value of bulk density for impeding CO2 efflux was more produced in 1.6 g/cm3 and the volume of small macropores affected CO2 efflux variation greatly. Ridge tillage is a better tillage practice for impeding soil CO2 efflux than no tillage, as evidenced by the lesser volume of small macropores.

19

Analysis of large particle sizes using a machine vision system

71%

Zhang Z. , Yang J. , Su X. , Ding L.

Physicochemical Problems of Mineral Processing

|

2013

|

tom Vol. 49, iss. 2

397--405

EN

Many methods based on machine vision were used to estimate coarse particles size distribution in recent years, but comparison of accuracy parameters representing particle size has not been carried out and a related representing analysis has not been yet proposed. Nine parameters were investigated. The results indicated the minor axis of equivalent ellipse and breadth of the best-fit rectangle were the most suitable for representing particle size. The former accuracy ratio was 86.43% and the latter accuracy ratio was 85.39%, while the accuracy of other parameters was less than 70%. A related representing analysis was proposed to explain this phenomenon. This research is instructive and meaningful for the size distribution estimation by machine vision.

20

An Improved Two-phase Commit Protocol Adapted to the Distributed Real-time Transactions

71%

Yan X. , Yang J. , Fan Q.

Przegląd Elektrotechniczny

|

2012

|

tom R. 88, nr 5b

27-30

EN

Based on the existing two-phase commit protocol (2PC), this paper proposes a protocol adapted to the distributed real-time transaction commit, which can avoid the blocking problem when dealing with transactions by coordinator redundancy; additionally, by the "health loan" of the locked data, the concurrency of transaction implementation is expanded to save the waiting time. Experimental analysis shows that: when the average arrival interval time of transaction is small, the success rate of the improved commit protocol is significantly higher than that of 2PC.

PL

artykule zaproponowano protokół bazujący na dwufazowym protokole typu 2PC. Nowy protokół pozwala na oszczędność czasu oczekiwania – jeśli średni czas odstępu między transakcjami jest mały przepływność danych jest wyższa niż w klasycznym protokole 2PC.