This thesis focuses on one of these ..
Nanotube activated carbon (NAC) prepared from Iraqi zahdi date seeds (ZDS) using physiochemical activation (KOH treatment and carbon dioxide gasification). The effects of the activation temperature, activation time and chemical impregnation ratios on the carbon yield, Pb2+ removal were investigated. From the analysis of variance (ANOVA), the most influential factor on each experimental design response was identified. The optimum conditions for preparing nano activated carbon from Zahdi date seeds were found to be activation temperature of 750.0 oC, activation time of 70 min and chemical impregnation ratio of 2.1. The carbon yield was found to be 19.0% while the removal of Pb2+ was found to be 94.0%.The nano activated carbon prepared for the removal of Pb2+ from aqueous solution by the adsorption process were found to contain, in general, large pore sizes. The higher activation temperature and KOH-char impregnation ratio (IR) applied is believed to be responsible for activated carbon characteristics which gave better outputs at least when compare to those being used commercially. However, the high surface areas and total pore volumes of the prepared activated carbon were believed to be due to the method of the activation process employed in this work which was a combination of both chemical and physical activating agents of KOH and CO2. Pore development during the carbonization process is an important step because it enhances the surface areas and pore volumes of the activated carbon by promoting the diffusion of KOH and CO2 moles into the pores thus increasing the KOH-C and CO2-C reactions; a process responsible for generating more pores in the activated carbon.
Design of a DVB-T Receiver - CORE
Mechanical stimuli, including gentle touch along the body (e.g., with a soft hair), gentle touch to the nose, harsh touch along the body (e.g., with a wire), and tapping of the culture plate, are perceived through touch receptors and proprioceptors that fall into three classes according to their cytoskeletal specialization: (1) mechanoceptors with ciliated sensory endings; (2) touch receptor neurons containing large-diameter, 15-protofilament microtubules (also called MT cells); and (3) neurons with processes containing synapse-free stretches and undifferentiated cytoskeletons () (; ; ; ; ). Mechanociliary neurons display features important for sensing any mechanical deflections over the worm’s surface; , , , , , and cilia terminate embedded within the cuticle, and all of them except for are anchored in this cuticle by small electron-dense nubbins. Additionally, the distal sections of , , , and cilia contain an amorphous, dark, microtubule-associated material (TAM) that is also found in mechanocilia of other species. cilia contain a dark-membrane-attached disc at their tips. All mechanosensory stimuli lead to avoidance responses in the hermaphrodite.
Mechanosensory neurons detect force through mechanically-gated ion channels which produce touch- or stretch-evoked currents. These channels are generally formed by two protein superfamilies; the TRP channels which are nonspecific cation channels composed of subunits with six transmembrane α helices, and heterotrimeric DEG/ENaC channels which are permeable to sodium and sometimes to calcium (; ; ). The C. elegans genome encodes 28 predicted DEG/ENaC proteins and 23 predicted TRP proteins().
is the merging of voice and data on shared infrastructure ( protocol).
It involves making phone calls using computer networks and, in particular, data networks that operate using the widely used Internet Protocol (). technology makes significantly more efficient use of existing line resources. This reduces the cost of calls. applications and telephony also work together better thanks to the shared network infrastructure.
Forward error correction - Wikipedia
Orthogonal Frequency Division Multiplexing (OFDM) is a transmission technique which ensures efficient utilization of the spectrum by allowing overlap of carriers. OFDM is a combination of modulation and multiplexing that is used in the transmission of information and data. Compared with the other wireless transmission techniques like Frequency Division Multiple Access (FDMA), Code Division Multiple Access (CDMA), OFDM has numerous advantages like high spectral density, its robustness to channel fading, its ability to overcome several radio impairment factors such as effect of AWGN, impulse noise, multipath fading, etc. Due to this it finds wide application in Digital Audio Broadcasting (DAB), Digital Video Broadcasting (DVB), and Wireless LAN. Most of the wireless LAN standards like IEEE 802.11a or IEEE 802.11g use the OFDM as the main multiplexing scheme for better use of spectrum. In fact in the 4G telecommunication system OFDMA is the backbone of it.
This project deals with the software simulation of this OFDM system in a mobile radio channel using the software tools of MATLAB® and SIMULINK®. From this simulation the performance of OFDM system in mobile radio channel is studied. Apart from this we also compare the OFDM system performance with the performance of the DS-CDMA system in the mobile radio channel.
brown-iposs GmbH - Experts in Wireless Broadband
refers to huge amounts of data which cannot be processed or can only be processed poorly using standard databases and data management tools. This data can, however, be stored and analyzed using suitable applications. Enterprises can, for instance, analyze forum contributions on the Internet, or internal operating and machine data in order to optimize their strategy as well as structures and processes.