Wyniki wyszukiwania - BazTech

1

Ocena jakości zielonej herbaty poprzez identyfikację chemicznych "odcisków palców"

Ding F., Cheng S., Liang Q., She Y., Zhang T., Hou D., Liang Y., Si S.

Przemysł Chemiczny

|

2018

|

T. 97, nr 9

1595--1600

PL

Nieliniowy chemiczny „odcisk palca” NCF (nonlinear chemical fingerprint) to nowa metoda analityczna szeroko ostatnio stosowana do identyfikacji i oceny materiałów. Zastosowano ją do oceny jakości różnych odmian zielonej herbaty. Po raz pierwszy zaprezentowano koncepcję wykorzystania widma NCF rośliny złożonej do rozpoznawania jej odmiany, jak również szczegółowo omówiono właściwości NCF.

EN

Seven various Chinese green teas were characterized by using the nonlinear chem. fingerprint method with electrochem. detection. The aq. suspensions of tea were treated with H2SO4, MnSO4 and Me2CO. The 1st grade Maojian tea (green bamboo mountain tea) showed the highest quality.

2

Badania nad Radix Sophorae Subprostratae za pomocą techniki nieliniowych fingerprintów chemicznych (pełne spektrum)

Ding F., She Y., Fang X., Li S., Liang Y., Zhang T., Si S.

Przemysł Chemiczny

|

2018

|

T. 97, nr 11

1884--1888

PL

Technika nieliniowego chemicznego fingerprintu NCF (non-linear chemical fingerprint) może być z powodzeniem stosowana do kompleksowej oceny układów złożonych. NCF wykorzystano do badania korzenia rośliny Sophorae Subprostratae ( Sophora subprostrata Chun et T. Chen), stosowanego w tradycyjnej medycynie chińskiej. W badaniach uwzględniono parametr jakościowy i parametr ilościowy reakcji (czas i potencjał) oraz ustalono matematyczną zależność pomiędzy nimi. W układzie oscylacyjnym złożonym z bromianu sodu, kwasu siarkowego, acetonu i siarczanu manganu optymalny zakres detekcji składników Radix Sophorae Subprostratae uzyskano dla ilości 0,7-1,5 g sproszkowanego korzenia. Wykazano pewne różnice w chemicznym składzie próbek Radix Sophorae Subprostratae pozyskanych z różnych regionów. Uzyskane wyniki porównano z wynikami analizy chromatograficznej.

EN

Radix Sophorae Subprostratae (traditional Chinese medicine) was evaluated in a fixed system consisting of NaBrO3, H2SO4, Me2CO and MnSO4 do det. its fingerprint. Three oscillation areas were established. The results agreed with chromatog. detd. data.

3

Comparison of mechanical flotation cell and cyclonic microbubble flotation column in terms of separation performance for fine graphite

Bu X., Zhang T., Chen Y., Peng Y., Xie G., Wu E.

Physicochemical Problems of Mineral Processing

|

2018

|

Vol. 54, iss. 3

732--740

EN

Comparison of flotation performance between the flotation column and mechanical flotation was carried out to promote the grade and economic value of the graphite ore (15.40% ash content). The ash content of the concentrate of the mechanical flotation was 10.77% at the yield of 79.34%. In contrast, the yield of the concentrate of the column flotation was increased to 88.93% with 10.55% ash content. Comparative study of the Fuerstenau upgrading curves indicated that the column flotation was more efficient for cleaning the graphite ore in the presence of the centrifugal force field, nanobubbles (generated by hydrodynamic cavitation), and the thicker froth layer in comparison with the mechanical flotation.

4

Blasting control and monitoring system for safety improvement during blasting operation. A case study in Guilaizhuang gold mine

Cao Y., Ji H., Zhang T.

Mining Science

|

2018

|

Vol. 25

33--48

EN

The design of a blasting monitoring and control system and its practical application in a blind gallery named Dongguabang in Guilaizhuang gold mine in China was presented in the paper. Based on reason analysis of blasting accidents occurring in metal mines, a blasting accident model is established in order to explain the process of the accident and its direct reasons. Also, effective approaches for preventing blasting accidents and avoiding casualties are achieved by controlling unsafe behaviour of workers and elimination of the critical "touch". Combined with analysis of safety ergonomics of blasting devices, all these make a joint contribution to providing theoretical instruction and references to establishment and design of blocking functions of blasting monitoring system. A set of blasting monitoring and control system is implemented, and equipped with blocking functions when unsafe behaviour and conditions appear. Tests of the monitoring system are carried out in the Donguabang heading of Guilaizhuang gold mine. It is documented that the blocking functions and the central computer platform run well during the tests. Test results reveal that blasting monitoring and control system and its functions are able to ensure safety and fulfil work requirements in Guilaizhuang gold mine.

5

Picea schrenkiana tree-ring chronologies development and vegetation index reconstruction for the Alatau Mountains, Central Asia

Zhang T., Zhang R., Lu B., Mambetov B. T., Kelgenbayev N., Dosmanbetov D., Maisupova B., Chen F., Yu S., Shang H., Huang L.

Geochronometria

|

2018

|

Vol. 45, no. 1

107--118

EN

In this study, a total of 176 tree cores from Schrenk spruce (Picea schrenkiana) were used to establish a tree-ring chronology and a 167-year July–October normalized differential vegetation index (NDVI) for the Alatau Mountains in Central Asia was reconstructed using this newly developed chronology. The tree-ring based NDVI reconstruction tracks the observed data well (r=0.577, p<0.01, n=25) and precisely captures the drought events recorded in historical documents that occurred over a large area in 1917 and 1938. After applying a 21-year moving average, three dense (1860–1870, 1891–1907, and 1950–1974) and three sparse (1871–1890, 1908–1949, and 1975–2006) vegetation coverage periods were found in this reconstruction. Spatial correlation proves that the reconstructed NDVI series contains climatic signals representative for a large area including southern Kazakhstan. Although a comparison between this reconstruction and four climatic reconstructions for southeastern Kazakhstan, Nilka (in the Ili region), the Issyk Lake, and the Aksu region reveals similar variations, the coherence between these reconstructions become weak with the increase in spatial distance from north to south. In addition to the local representation, it was also demonstrated that the newly developed NDVI index can indicate the large-scale circulations over Eurasia, with the higher NDVI associated with stronger westerly winds from the Atlantic to the Alatau Mountains, and the lower NDVI associated with the weaker winds.

6

Development of a Larix principis-rupprechtii tree-ring width chronology and its climatic signals for the southern Greater Higgnan Mountains

Zhang T., Yu S., Yuan Y., Huang L., Jiang S.

Geochronometria

|

2018

|

Vol. 45, no. 1

1--9

EN

Forty-one living larch (Larix principis-rupprechtii) trees collected from two sampling sites in 1310–1530 m a.s.l. in the southern Greater Higgnan Mountains in the northeastern China are used to develop a regional tree-ring width chronology. The credible chronology spans 185 years from 1830 to 2014. The results of correlation analyses indicate that moisture is the main climatic factor controlling radial growth of larch trees in this mountainous area. Spatial correlation proves that the regional tree-ring width chronology contains climatic signals representative for a large area including the eastern Mongolian Plateau and Nuluerhu Mountains. A comparison between the newly developed chronology and a May–July Palmer Drought Severity Index (PDSI) reconstruction for the Ortindag Sand Land reveals similar variations, particularly in the low-frequency domain. The tree-ring records also capture a severe and sustained drying trend recorded in the 1920s across a wide area of northern China.

7

Influence of Polytetrafluorethylene on the Mechanical and Safety Properties of a Composite Modified Double Base Propellant

Sun S., Zhang T., Zhao B., Zhang G., Li X., Luo Y.

Central European Journal of Energetic Materials

|

2018

|

Vol. 15, no. 3

468--484

EN

A novel Composite Modified Double Base (CMDB) propellant, formed by mechanically mixing aluminium/polytetrafluorethylene (Al/PTFE) powders, was prepared through a rolling process. A variety of tests, such as tensile properties, particle size analysis etc., were carried out to study the influence of PTFE on the CMDB propellant properties. The PTFE deformed from particles to fibres under a uniform shear force, forming a fibre network which greatly improved the propellant’s mechanical properties. Compared to that of the CMDB propellant without PTFE, the elongation of the propellant containing 6% PTFE was increased by 26 times, and moreover, the impact strength was enhanced by 326% at −40 °C. Significantly, the propellant friction and impact sensitivities were reduced by 75.8% and 35.6%, respectively. In addition, the presence of PTFE in the propellant resulted in fluorination of the Al. The gaseous combustion product AlF3 reduced the propellant combustion agglomeration. Consequently, PTFE significantly promoted the propellant’s mechanical performance, decreased the shock (friction, impact) sensitivity and reduced combustion agglomeration.

8

Generalized Stockwell transform and SVD-based epileptic seizure detection in EEG using random forest

Zhang T., Chen W., Li M.

Biocybernetics and Biomedical Engineering

|

2018

|

Vol. 38, no. 3

519--534

EN

Purpose: Visual inspection of electroencephalogram (EEG) records by neurologist is the main diagnostic method of epilepsy but it is particularly time-consuming and expensive. Hence, it is of great significance to develop automatic seizure detection technique. Methods: In this work, a seizure detection approach, synthesizing generalized Stockwell transform (GST), singular value decomposition (SVD) and random forest, was proposed. Utilizing GST, the raw EEG was transformed into a time–frequency matrix, then the global and local singular values were extracted by SVD from the holistic and partitioned matrices of GST, respectively. Subsequently, four local parameters were calculated from each vector of local singular values. Finally, the global singular value vectors and local parameters were respectively fed into two random forest classifiers for classification, and the final category of a testing EEG was voted based on sub-labels obtained from the trained classifiers. Results: Four most common but challenging classification tasks of Bonn EEG database were investigated. The highest accuracies of 99.12%, 99.63%, 99.03% and 98.62% were achieved using our presented technique, respectively. Conclusions: Our proposed technique is comparable or superior to other up-to-date methods. The presented method is promising and able to handle with kinds of epileptic seizure detection tasks with satisfactory accuracy.

9

Design of brake force distribution model for front-and-rear-motor-drive electric vehicle based on radial basis function

Sun B., Zhang T., Gao S., Ge W., Li B.

Archives of Transport

|

2018

|

Vol. 48, iss. 4

87--98

EN

To achieve high-efficiency and stable brake of a front-and-rear-motor-drive electric vehicle (FRMDEV) with parallel cooperative braking system, a multi-objective optimal model for brake force distribution is created based on radial basis function (RBF). First of all, the key factors, which are the coefficient of brake force distribution between the front and rear shafts, the coefficient of brake force distribution at wheels, the coefficient of regenerative brake force distribution between front and rear axles, that influence the brake stability and energy recovery of the FRMDEV are analyzed, the fitness functions of brake stability and energy recovery are established. Secondly, the maximum allowed regenerative brake torque influenced by the state of charge of battery is confirmed, the correction model of the optimal distribution coefficient of regenerative brake force is created according to motor temperatures. Thirdly, based on HALTON sequence method, a two-factor database, vehicle velocity and brake strength, that characterizes vehicle operation is designed. Then an off-line response database of the optimal brake force distribution is established with the use of particle swarm optimization (PSO). Furthermore, based on hybrid RBF, the function model of the factor database and the response database is established, and the accuracy of the model is analyzed. Specially, the correlation coefficient is 0.995 and the predictive error variance is within the range between 0.000155 and 0.00018. The both indicate that the multi-objective distribution model has high accuracy. Finally, a hardware-in-loop test platform is designed to verify the multi-objective optimal brake force distribution model. Test results show that the real-time performance of the model can meet the demand of engineering application. Meanwhile, it can achieve both the brake stability and energy recovery. In comparison with the original brake force distribution model based on the rule algorithm, the optimized one proposed in this paper is able to improve the energy, recovered into battery, by 14.75%.

10

Application of MODWT and log-normal distribution model for automatic epilepsy identification

Li M., Chen W., Zhang T.

Biocybernetics and Biomedical Engineering

|

2017

|

Vol. 37, no. 4

679--689

EN

In this paper, a novel approach based on the maximal overlap discrete wavelet transform (MODWT) and log-normal distribution (LND) model was proposed for identifying epileptic seizures from electroencephalogram (EEG) signals. To carry out this study, we explored the potentials of MODWT to decompose the signals into time-frequency sub-bands till sixth level. And demodulation analysis (DA) was investigated to reveal the subtle envelope information from the sub-bands. All obtained coefficients were then used to calculate LDN features, scale parameter (s) and shape parameter (m), which were fed to a random forest classifier (RFC) for classification. Besides, some experiments have been conducted to evaluate the performance of proposed model in the consideration of various wavelet functions as well as feature extractors. The implementation results demonstrated that our proposed technique has yielded remarkable classification performance for all the concerned problems and outperformed the reported methods in terms of the universality. The major finding of this research is that the proposed technique was capable of classifying EEG segments with satisfied accuracy and clinically acceptable computational time. These advantages have make our technique an attractive diagnostic and monitoring tool, which helps doctors in providing better and timely care for the patients.

11

Sustainable Mitigation of Greenhouse Gases Emissions

Cel W., Czechowska-Kosacka A., Zhang T.

Problemy Ekorozwoju

|

2016

|

Vol. 11, nr 1

173--176

EN

The emission and absorption fluxes of CO2 and CH4 in the environment have been characterized. It has been pointed out that the anthropogenic emission of CO2 amounts only to 3% of emissions from the natural sources. It has been also noted that increasing CO2 absorption of terrestrial ecosystems by 3% could inhibit the increase of CO2 concentration in the atmosphere. This means that mitigation of global warming by intensifying natural processes is a more sustainable solution than performing expensive changes in energy policy. Lowering the emission of methane, on the other hand, can be accomplished by utilizing fodder additives for ruminants and the process of microbiological methane oxidation in covering soil layers or biofilters.

PL

W artykule scharakteryzowano strumień emisji i absorpcji gazów cieplarnianych CO2 i CH4 w środowisku. Zwrócono uwagę, że antropogeniczna emisja CO2 wynosi zaledwie 3% poziomu emisji ze źródeł naturalnych. Ponadto zauważono, że intensyfikacja absorpcji CO2 przez ekosystemy lądowe o 3% mogłaby zahamować wzrost stężenia CO2 w atmosferze. Oznacza to, że bardziej zrównoważone jest przeciwdziałanie efektowi cieplarnianemu poprzez intensyfikację procesów naturalnych od kosztownych zmian w polityce energetycznej. Natomiast ograniczanie emisji innego gazu cieplarnianego – metanu – można osiągnąć poprzez stosowanie dodatków do paszy dla zwierząt przeżuwających oraz wykorzystanie procesu mikrobiologicznego utleniania metanu w nakładach glebowych i biofiltrach.

12

Waste printed circuit boards nonmetallic powder as replacement for sand in cement mortar

Wang R., Zhang T., Wang P.

Materiały Budowlane

|

2016

|

nr 1

59--62

EN

The nonmetallic powder recycled from waste printed circuit boards (PCB) is used in cement mortar as replacement for sand. The results show that the waste PCB nonmetallic powder causes an increase in air content and improves the water-retention property of fresh mortar, decreases the bulk density of hardened mortar. There is a decrease in the compressive and flexural strengths with the addition of waste PCB nonmetallic powder and the decreasing degree depends on the substitution amount of the nonmetallic powder for sand. The tensile bond strength decreases slowly with the increase of the substitution amount from 0% to 35%. The water capillary adsorption of mortar is close to that of control when 10% and 20% sand is replaced. The use of mortar made with recycled waste PCB nonmetallic powder as sand replacement offers promise for applications as medium weight or light weight concrete, while adding value to a post-consumer electric and electronic material that is now generally treated as solid waste.

PL

W artykule analizowano możliwość wykorzystania niemetalicznego proszku pochodzącego z recyklingu płytek drukowanych PCB (ang. Printed Circuit Boards) jako zamiennika piasku w zaprawach cementowych. Uzyskane wyniki wskazują, że dodatek proszku PCB powoduje wzrost zawartości powietrza, poprawę zdolności do retencji wody świeżej zaprawy oraz zmniejszenie gęstości objętościowej stwardniałej zaprawy. Obserwowany spadek wytrzymałości na ściskanie i zginanie zależy od stopnia substytucji piasku proszkiem PCB. Przyczepność przy rozciąganiu spada stopniowo ze wzrostem substytucji od 0 do 35%. Adsorpcja kapilarna wody zapraw modyfikowanych jest zbliżona do wartości uzyskanej w przypadku próbki kontrolnej, jeśli stopień substytucji proszkiem PCB jest mniejszy niż 20%. Wyniki uzyskane dla zapraw z proszkiem PCB wskazują także na możliwość ich wykorzystania w betonach lekkich. Potwierdzają także, że zużyte elektryczne i elektroniczne płytki drukowane, uważane za produkty odpadowe, mogą być z powodzeniem wykorzystane w technologii materiałów budowlanych.

13

Tree-Ring Response to Snow Cover and Reconstruction of Century annual Maximum Snow Depth for Northern Tianshan Mountains, China

Qin L., Yuan Y., Zhang R., Wei W., Yu S., Fan Z., Chen F., Zhang T., Shang H.

Geochronometria

|

2016

|

Vol. 43, no. 1

9--17

EN

Heavy snowfall and extreme snow depth cause serious losses of human life and property in the northern Tianshan Mountains almost every winter. Snow cover is an important indicator of climate change. In this study, we developed five tree-ring-width chronologies of Schrenk spruce (Picea schrenkiana Fisch. et Mey) from the northern Tianshan Mountains using standard dendrochronological methods. Correlation analyses indicated that radial growth of trees in the northern Tianshan Mountains is positively affected by annual maximum snow depth. This relationship was validated and models of annual maximum snow depth back to the 18th century were developed. The reconstruction explains 48.3% of the variance in the instrumental temperature records during the 1958/59–2003/04 calibration periods. It indicates that quasi-periodic changes exist on 2.0–4.0-yr, 5.3-yr, 14.0-yr, and 36.0-yr scales. The reconstructed series shows that maximum snow depth exhibits obvious stages change, the periods characterized by lower maximum snow depth were 1809/10–1840/41, 1873/74– 1893/94, 1909/10–1929/30, 1964/65–1981/82, and the periods characterized by higher maximum snow depth were 1841/42–1872/73, 1894/95–1908/09, 1930/31–1963/64, and 1982/83–present. The lower period of annual maximum snow depth during the 1920s–1930s is consistent with the severe drought that occurred at this time in northern China. From the 1970s to the present, the maximum snow depth has increased clearly with the change to a warmer and wetter climate in Xinjiang. The reconstruction sheds new light on snow cover variability and change in a region where the climate history for the past several centuries is poorly understood.

14

Chemical interaction between polymer and cement in polymer-cement concrete

Wang R., Li J., Zhang T., Czarnecki L.

Bulletin of the Polish Academy of Sciences. Technical Sciences

|

2016

|

Vol. 64, nr 4

785--792

EN

Polymers are widely used in cement mortar and concrete modification due to their significant role in improving the overall performance of cement-based materials. Their physical interaction is well-accepted, while less attention is given to chemical interaction between the polymers and cement. Through a review of prior arts, chemical interactions are discussed and summarized in this paper. Various chemical interactions may take place between cement and different types of polymers. Understanding these chemical interactions will play an important role in clarifying the relationship between microstructure and macrostructure of polymer-modified cementitious materials. Authors expressed and proved the conviction that the organic-inorganic (Polymer-Portland cement) composite with some components chemically bonded, in parallel to the physical interaction, will be the next stage in concrete technology progress.

15

Automatic tracking of neural stem cells in sequential digital images

Zhang T., Jia W., Zhu Y., Yang J.

Biocybernetics and Biomedical Engineering

|

2016

|

Vol. 36, no. 1

66--75

EN

Neural stem cells are the cells that give rise to the main cell types of the nervous system. Due to their varying size and shape, and random movement, the tracking of these cells in suspension in video sequences is challenging. This paper develops an automatic tracking system for neural stem cells. The system first detects and localizes cells in the image sequence, followed by a feature extraction step for the subsequent cell tracking. Then, the system tracks inactive cells using an improved mean shift algorithm, divisive cells through a context-based technique, and active cells by means of dynamic local prediction (DLP) and gray prediction (GP) algorithms. Experimental results show that the proposed system not only improves the accuracy of fast moving tracking, but also constructs accurately the trajectories of the cell movement and reduces the iterations during the center searching.

16

Automatic epilepsy detection using wavelet-based nonlinear analysis and optimized SVM

Li M., Chen W., Zhang T.

Biocybernetics and Biomedical Engineering

|

2016

|

Vol. 36, no. 4

708--718

EN

Aiming at the problems of low accuracy, poor universality and functional singleness for seizure detection, an effective approach using wavelet-based non-linear analysis and genetic algorithm optimized support vector machine (GA-SVM) is proposed to deal with five challenging classification problems in this study. Instead of the traditional discrete wavelet transform (DWT), we attempt to explore the ability of double-density discrete wavelet transform (DD-DWT) to decompose the original EEG into specific sub-bands. The Hurst exponent (HE) and fuzzy entropy (FuzzyEn) are extracted as input features and then fed into two classifiers. On using these ranking non-linear features, the GA-SVM configured with fewer features is found to achieve the prominent classification performance for various combinations such as AB-CD-E, A-D-E, ABCD-E, C-E and D-E, achieving accuracies of 99.36%, 99.60%, 99.40%, 100% and 100%, respectively. The results have indicated that our scheme is not only appropriate in solving problems with multiple classes but also of lower complexity and better expansibility. These characteristics would make this method become an attractive alternative for actual clinical diagnosis.

17

Influence of Rolling Friction Coefficient on Inter-Particle Percolation in a Packed Bed by Discrete Element Method

Zhou H., Luo Z., Zhang T., You Y., Li H., Zou Z.

Archives of Metallurgy and Materials

|

2016

|

Vol. 61, iss. 4

1795--1804

EN

Rolling friction representing the energy dissipation mechanism with the elastic deformation at the contact point could act directly on particle percolation. The present investigation intends to elucidate the influence of rolling friction coefficient on inter-particle percolation in a packed bed by discrete element method (DEM). The results show that the vertical velocity of percolating particles decreases with increasing the rolling friction coefficient. With the increase of rolling friction coefficient, the transverse dispersion coefficient decreases, but the longitudinal dispersion coefficient increases. Packing height has a limited effect on the transverse and longitudinal dispersion coefficient. In addition, with the increase of size ratio of bed particles to percolation ones, the percolation velocity increases. The transverse dispersion coefficient increases with the size ratio before D/d<14. And it would keep constant when the size ratio is greater than 14. The longitudinal dispersion coefficient decreases when the size ratio increases up to D/d=14, then increases with the increase of the size ratio. External forces affect the percolation behaviours. Increasing the magnitude of the upward force (e.g. from a gas stream) reduces the percolation velocity, and decreases the dispersion coefficient.

18

A novel method to calculate the mechanical properties of cancer cells based on atomic force microscopy

Zhang T, Zhao Y., Tong Z., Guang Y.

Acta of Bioengineering and Biomechanics

|

2016

|

Vol. 18, no. 1

19--24

EN

Purpose: Mechanical properties, as the inherent characteristics of cells, play a critical role in many essential physiological processes, including cell differentiation, migration, and growth. The mechanical properties of cells are one of the criteria that help to determine whether the tissue contains lesions at the single cell level, and it is very important for the early prevention and accurate diagnosis of diseases. Atomic force microscopy (AFM) makes it possible to measure the mechanical properties at single cell level in physiological state. This paper presents a novel method to calculate the mechanical properties of cancer cells more accurately through Atomic force microscopy. Methods: A new induced equation of Hertz’s model, called differential Hertz’s model, has been proposed to calculate the mechanical properties of cancer cells. Moreover, the substrate effect has also been effectively reduced through comparing the calculated mechanical properties of cell at different cell surface areas. Results: The results indicate that the method utilized to calculate the mechanical properties of cells can effectively eliminate the errors in calculation, caused by the thermal drift of AFM system and the substrate effect, and thus improve the calculation accuracy. Conclusion: The mechanical properties calculated by our method in this study are closer to the actual value. Thus, this method shows potential for use in establishing a standard library of Young’s modulus.

19

Integrating Role of Sustainable Development Paradigm in Shaping the Human-landscape Relation

Bielińska E. J., Futa B., Baran S., Żukowska G., Pawłowska M., Cel W., Zhang T.

Problemy Ekorozwoju

|

2015

|

Vol. 10, nr 2

159--168

EN

In order to implement the sustainable development paradigm more broadly, it is postulated to deviate from the simple protectionism, which is based on sectoral approach, in favour of systemic landscape management, which encompasses the human-landscape relations. The article presents the issues concerning rural landscape protection in Poland in relation to the assumptions of the European Landscape Convention. The aim of the article is to analyze the causes of inefficiency of the Polish rural landscape protection system.

PL

W celu szerszego uwzględnienia paradygmatów zrównoważonego rozwoju postulowane jest odejście od ochraniarstwa, opartego na ujęciu sektorowym, na rzecz systemowego zarządzania krajobrazem, obejmującego relacje człowiek-krajobraz. W artykule przedstawiono zagadnienia dotyczące ochrony krajobrazu na obszarach wiejskich w Polsce odnosząc je do zapisów Europejskiej Konwencji Krajobrazowej. Celem artykułu jest analiza przyczyn nieskuteczności polskiego systemu ochrony krajobrazu na obszarach wiejskich.

20

Estimation of phosphorus recovery by struvite crystallization from animal manure wastewater in China

Fang C., Zhang T., Czechowska-Kosacka A., Pawlowski A., Łagód G., Jiang R., Wang Q.

Environment Protection Engineering

|

2015

|

Vol. 41, nr 4

195--207

EN

Intensive farming is main industry which produces large amount of animal manure wastewater with high content of phosphorus. Its discharging to surface water leads to eutrophication. On the other hand, phosphorus is vital for plant growth and its natural reserves are rapidly exhausted. Therefore, recovering phosphorus from animal manure wastewater can achieve two important goals: prevention of eutrophication and recovery of non-renewable phosphorus compounds. The method of struvite precipitation has been presented for phosphorus recovery from animal manure wastewater. Based on scenario study, 8.76 million tons of struvite could be produced from animal manure wastewater in China.