Wyniki wyszukiwania - Biblioteka Nauki

1

Senescence regulation by alcohols in cut flowers of Calendula officinalis L.

100%

Kaur P. , Mukherjee D.

|

2013

|

tom 35

|

nr 06

EN

This study was conducted to investigate the effect of alcohols viz., ethanol, methanol and n-butanol at different concentrations not only on the vase life of Calendula officinalis L. cut flowers but also to record changes in metabolites like starch content and amount of sugars, and activities of a-amylase, and antioxidant enzymes like peroxidase and superoxide dismutase as well as lipid peroxidation. Ethanol as holding solution significantly increased the vase life as compared to other treatments or the control. n-Butanol shortened vase life and caused the flower stem to fold, whereas ethanol and methanol individually delayed drying up and petals dried slowly from their tips. Significant increments in solution uptake, moisture content and flower diameter were noticed with 2 % ethanol followed by 2 % methanol. Cut scapes having 2 % ethanol exhibited maximum amount of starch and considerably lower amount of reducing and nonreducing sugars. This treatment not only brings down the specific activities of a-amylase and peroxidase but also decreases the process of lipid peroxidation. Effectiveness of methanol (2 %) is evident just after ethanol application (2 %). Lowest concentrations of ethanol and methanol also show relatively higher level of SOD activity in cut flowers of Calendula officinalis.

2

A modified ranking approach for solving fuzzy critical path problems with LR flat fuzzy numbers

100%

Kaur P. , Kumar A.

|

tom Vol. 41, no. 1

171-190

EN

There are several fuzzy critical path methods for solving fuzzy critical path problems in which ranking approaches are used for comparing fuzzy numbers. In this paper, it is shown that if the existing ranking approaches are used for solving such fuzzy critical path problems in which duration times of activities are represented by LR flat fuzzy numbers, then more than one fuzzy numbers, representing the fuzzy project completion time, are ob- tained and a new ranking approach for comparing LR flat fuzzy numbers is proposed. Also, it is proved that if the proposed rank- ing approach is used for solving fuzzy critical path problems then a unique fuzzy number, representing the fuzzy project completion time, is obtained.

3

Relay-assisted WDM-FSO System: A Better Solution for Communication under Rain and Haze Weather Conditions

80%

Dayal N. , Singh P. , Kaur P.

Journal of Telecommunications and Information Technology

|

2017

|

tom nr 4

54--59

EN

Among various conventional wireless communication systems, Free Space Optics (FSO) may be distinguished as well, which provides a good level security, high data rates, an enormous bandwidth and negligible susceptibility to electromagnetic interference. The main problem arises with unfavorable weather conditions, which affect the system’s parameters and require an aversion to other paths. The weather conditions discussed are rain and haze. Elimination of their adverse effects is essential for establishing a better communication system. The routing path is a major issue, as its decreased parameters lead to the diversion of the transmitted signal or to its total loss. In this article, increased system path length and proﬁciency levels are demonstrated by using relays, which are assisted by Wavelength Division Multiplexing (WDM).

4

Complex permittivity, permeability and microwave absorbing properties of Co–Ti substituted strontium hexaferrite

80%

Narang S. B. , Kaur P. , Bahel S.

|

tom Vol. 34, No. 1

19--24

EN

M-type strontium ferrite with compositions SrFe(12-2x)CoxTixO19 (x = 0.0, 0.3, 0.5, 0.7, 1.0), were prepared by two route ceramic method. The effects of Co-Ti substitution on their microstructure, electromagnetic properties, and microwave absorptive behavior were analyzed. The complex permittivity (epsilon'-j epsilon '') and complex permeability (mu'-j mu '') have been measured from 8.2 to 12.4 GHz using a network analyzer. Scanning electron microscope was used to analyze the grain size distribution and porosity of the ferrite. X-ray diffraction confirmed the M-type structure of the doped strontium ferrite. Vibrating sample magnetometer was used to study hysteresis loop of the ferrite. This study suggests that the control of grain size, decrease in coercivity and enhanced values of dielectric constant and loss are effective means to improve microwave absorption. The dielectric constant and loss were enhanced in comparison to the permeability constant and loss over the entire frequency range.

5

Pesticide residues in milk and their relationship with pesticide contamination of feedstuffs supplied to dairy cattle in Punjab (India)

80%

Bedi J. S. , Gill J. P. S. , Kaur P. , Aulakh R. S.

Journal of Animal and Feed Sciences

|

2018

|

tom 27

|

nr 1

EN

The aim of the present study was to investigate the correlation between pesticides contamination of feedstuffs supplied to dairy cattle and pesticide residues in bovine milk. The animal concentrate feed, fodder, water and milk samples were collected from 55 dairy farms in Punjab (India) representing intensive production and typical feeding management. The concentrate feed, fodder/silage, water and milk samples were extracted by multiple residue methodology and pesticide residues concentration was estimated by gas chromatography. It was shown that chlorpyrifos pesticide was the main contaminant detected at mean level of 6.01, 4.05 and 2.58 ng · g−1 in concentrate feed, fodder and milk samples, respectively. Other pesticide residues observed in feed and milk samples were: endosulphan sulphate, cypermethrin, ethion, p,p’-DDE, lindane, malathion and fenvalerate. Chlorpyrifos was the only pesticide detected in one water sample. Though the mean residue levels of pesticides were substantially below the maximum residue limits (MRL), individually two milk samples exceeded the MRL value for lindane (1.0 ng · g−1) and three for DDT (20.0 ng · g−1) and chlorpyrifos (20.0 ng · g−1). Two milk samples also violated the MRL value (10.0 ng · g−1) for endosulphan sulphate residues. However, none of the samples was found above the MRL (50.0 ng · g−1) for cypermethrin. The relationship between occurrence of pesticide residues in feedstuff and milk might suggest that animal feed is the main source for appearance of pesticides in milk. However, environmental contamination with pesticides, lack of good management practices while using pesticides and violation of withdrawal period for ectoparasiticides may also result in the occurrence of pesticide residues in milk

6

Mitigation of Scintillation Effects in WDM FSO System using Multibeam Technique

80%

Grover M. , Singh P. , Kaur P.

Journal of Telecommunications and Information Technology

|

2017

|

tom nr 2

69--74

EN

Free Space Optical communication (FSO) has engrossed a large section of researchers in recent times due to its wide bandwidth, effortless deployment and immune links making it appropriate for communication purposes. This wireless optical technique requires clear and non-turbulent atmospheric conditions for efficient transmission. In this paper, authors aim at reducing the effect of turbulent atmospheric conditions like scintillation effect on FSO. Multibeam technique, which uses spatially diverse transmitters for transmission, has been used for increasing the achievable link distance of the FSO system. Parameters like quality factor and bit error rate have been used to check the received signal quality.

7

Critical analysis of vector-borne infections in dogs: Babesia vogeli, Babesia gibsoni, Ehrlichia canis and Hepatozoon canis in Punjab, India

70%

Singla L. D. , Sumbria D. , Mandhotra A. , Bal M. S. , Kaur P.

|

tom 61

|

nr 4