Wyniki wyszukiwania - BazTech

1

Objective assessment for characterising the flatness of garment sewing stitches

Jiang H., Liu J., Chai Z., Wang C., Zhang M.

Autex Research Journal

|

2013

|

Vol. 13, no. 4

110--117

EN

In this paper, a novel classification method of assessing garment sewing stitch based on amended bi-dimensional empirical mode decomposition (ABEMD) has been introduced. Two parameters that characterise garment sewing stitch, average area and standard deviation, have been defined based on the grey value of pixels. Experimental results showed that when the window size is 512×128 pixels with regard to average area, the threshold can be decided as 6.00, 5.50, 5.30 and 4.00 for five different grades , respectively. Meanwhile, with regard to standard deviation, the threshold can be decided as 48.00, 40.00, 30.00 and 20.00, respectively. It is demonstrated that the parameters are effective in discriminating sewing stitch images in terms of the grades when used as inputs for the ABEMD. The performance of the algorithm on different garment status is significantly reliable.

2

Trace metal disturbance in mice brain after intranasal exposure of nano- and submicron-sized Fe2O3 particles

Wang B., Wang Y., Feng W., Zhu M., Wang M., Ouyang H., Wang H., Li M., Zhao Y., Chai Z.

Chemia Analityczna

|

2008

|

Vol. 53, No. 6

927-942

EN

Trace metals in the brain play an important role in the function of central nervous system (CNS). The objective of this work is to investigate the effects of intranasal exposure of nano- and submicron-sized Fe2O23, particles on the homeostasis of trace metals in the brain. After a single intranasal instillation of nano- and submicron-sized Fe2O23, particles, the contents of Fe, Cu and Zn in the sub-brain regions were determined in the time course from 4 h till to the 30 day post-exposure. Our results indicated that the imbalance of trace metals in the sub-brain regions of mice was induced by the two sizes of Fe2O23, particles. The more significant accumulation of Fe in the brain was found in the nano-Fe2O23., treated mice than in the submicron-Fe2O23, treated ones; meanwhile, similar alterations of Zn contents in the brain were observed as well. A strong positive correlation between Fe and Zn levels in the olfactory bulb of nano-Fe2O23 instilled mice and in the hippocampus and cerebral cortex of submicron-Fe2O23 instilled mice were found. This is the first trial to investigate the disturbance of trace metals in the brain after exposure to Fe2O23 nanoparticles. These results state that much attention should be paid to the potential impact of inhaled FCjCX, nanoparticles on the CNS.

PL

Metale śladowe odgrywająistotnąrolę w funkcjonowaniu ośrodkowego układu nerwowego. Celem tej pracy jest zbadanie wpływu donosowej ekspozycji nano- i submikronowej wielkości cząstek Fe2O23 na homeostazę mikroelementów w mózgu. Badano zawartość Fe, Cu i Zn w czasie od 4 godzin do 30 dni po donosowym podaniu cząstek Fe2O23, o rozmiarach ťano- i submikronowych. Uzyskane rezultaty wskazują, że te dwa rozmiary cząstek Fe2O23., wywoływały zaburzenia równowagi powyższych mikroelementów w różnych strukturach mózgu myszy. W mózgu myszy potraktowanych nano-Fe2O3 zaobserwowano znaczniejszą akumulację Fe niż u myszy potraktowanych submikrono-Fe2O Podobne zmiany zaobserwowano również w zawartości Zn w mózgu. Zaobserwowano istotną korelację między zawartością Fe i Zn w opuszce węchowej myszy, którym podano nano-Fe2O oraz w hipokampie i korze mózgowej myszy potraktowanych submikrono-Fe2O praca ta stanowi pierwszą próbę zbadania zaburzenia poziomu metalicznych mikroelementów w mózgu po ekspozycji nanocząsteczkami Fe2O Uzyskane dane wskazują, że należy zwracać szczególną uwagę na potencjalny wpływ wdychanych nanoczastek Fe2O na ośrodkowy układ nerwowy.

3

Tissue contents and intracellular distribution of selenium and iodine in human tissues studied by neutron activation analysis

Chen C., Zhao J., Gao Y., Chai Z.

Chemia Analityczna

|

2005

|

Vol. 50, No. 1

169-178

EN

Selenium and iodine are two essential elements in living systems. In this paper, the tissue contents and subcellular distributions of selenium and iodine in human liver, - kidney and heart samples were studied by neutron activation analysis (NAA). Certified reference materials were used as analytical quality control. Selenium was highly enriched in human kidney, followed by liver and then heart. In contrast, iodine was only enriched in liver. Different subceHular distribution patterns were also found in different tissues. In addition, selenium was mainly enriched in mitochondria and nuclei, whereas the lowest concentration of iodine was in the soluble fractions of cells. About 45-70% of total Se and 1 were in the nuclear fractions. The present data can reflect the long-term accumulation of selenium and iodine inhuman body. Our study also provides the reference data of selenium and Iodine in human important tissues and the corresponding subcellular fractions.

PL

Metoda,neutronowej analizy aktywacyjnej oznaczano zawartość i rozkład wewnątrzkomórkowy selenu i jodu w próbkach ludzkiej wątroby, nerek i serca. Wyniki skontrolowano stosując certyfikowane materiały referencyjne. Istotne wzbogacenie w selen stwierdzono \v nerkach, a następnie w wątrobie i sercu. Zwiększenie steżeniajodu stwierdzono jedynie w wątrobie. Stwierdzono również różnice w rozkładzie pierwiastków na poziomie wewnątrzkomórkowym w różnych tkankach. Selen ulegał wzbogaceniu głównie w mitochondriach i jądrach komórkowych, podczas gdy najniższe stężenie jodu stwierdzono w rozpuszczalnych frakcjach komórek. Około 45-70% całkowitej zawartości selenu i jodu stwierdzono w jądrach komórkowych. Dane te odzwierciedlają długotrwałą akumulacje selenu i jodu w ludzkim ciele. Nasze badania dostarczają porównawczych danych odnośnie zawartości pierwiastków w ważnych tkankach ludzkich oraz we frakcjach wewnątrzkomórkowych.

4

Study of organohalogens in foodstuffs and environmental samples by neutron activation analysis and related techniques

Xu D., Chai Z., Zhang H., Mao X., Ouyang H., Sun H.

Nukleonika

|

2004

|

Vol. 49, nr 3

101-106

EN

Pine needles and foodstuffs collected from Beijing, China, were analyzed by instrumental neutron activation analysis (INAA) combined with organic solvent extraction for total halogens, extractable organohalogens (EOX) and extractable persistent organohalogens (EPOX). The INAA detection limits are 50 ng, 8 ng and 3.5 ng for Cl, Br and I, respectively. The contents and distribution patterns of organohalogens in these samples are reported. EOCl accounted for 0.013 0.016% and 1.6 2.7% of the total chlorine in yogurt and apples, respectively, which suggested that chlorine in foodstuffs mainly existed as inorganic species and non-extractable organochlorines. EOCl contents in pine needles and foodstuffs were noticeably higher than those of EOBr and EOI. For pine needles, yogurt and apples, 1.6 34%, 23 58% and 29 35% of EOCl remained as extractable persistent organochlorine (EPOCl), respectively. Pine needle containing higher EOCl contents in chemical industrial and traffic hub areas indicated that chemical industries and exhaust emission from vehicle were the main sources of organochlorines in the Beijing's air. The relative proportions of the known organochlorines (such as HCHs, DDTs, chlordanes, heptachlor, HCB and PCBs) to the total EOCl and EPOCl were 0.04 1.6% and 0.7 21.5%, respectively, which implied that the identity of species of a major portion of the EOCl and EPOCl measured in pine needles was unknown.