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CRISPR transcriptional repression devices and layered circuits in mammalian cells
Kiani, Samira,Beal, Jacob,Ebrahimkhani, Mohammad R,Huh, Jin,Hall, Richard N,Xie, Zhen,Li, Yinqing,Weiss, Ron Nature Publishing Group, a division of Macmillan P 2014 NATURE METHODS Vol.11 No.7
A key obstacle to creating sophisticated genetic circuits has been the lack of scalable device libraries. Here we present a modular transcriptional repression architecture based on clustered regularly interspaced palindromic repeats (CRISPR) system and examine approaches for regulated expression of guide RNAs in human cells. Subsequently we demonstrate that CRISPR regulatory devices can be layered to create functional cascaded circuits, which provide a valuable toolbox for engineering purposes.
Kiani Malkah Noor,Ahmad Mehboob,Gillani Syed Hussain Mustafa 기술경영경제학회 2019 ASIAN JOURNAL OF TECHNOLOGY INNOVATION Vol.27 No.2
Espousing a continuous innovation in existing business models is a necessity to sustain in present dynamic status quo of emerging mobile banking sector of Pakistan. Therefore, this research aims to empirically investigate the factors that affect the business model innovation among the key players of the mobile banking sector of Pakistan. In this regard, four research questions have been formulated. Research survey has been conducted from the 365 employees of mobile banking sector of Pakistan through a stratified sampling strategy. The collected data were analyzed using the regression-based process approach of Andrew Hayes [2017. Introduction to mediation, moderation, and conditional process analysis: A regression-based approach. Guilford Press]. The results of the collected data revealed that the service innovation capabilities, innovation success and knowledge exploration serve as the antecedents of business model innovation among Pakistani mobile banking sector. The contribution of this research work is evident from the fact that no or negligible researches on the business model innovation have been carried earlier in the cultural context of Pakistan. Furthermore, this research work attempts to close some of the identified gaps in the literature.
In-plane and out-of-plane waves in nanoplates immersed in bidirectional magnetic fields
Keivan Kiani,Saeed Asil Gharebaghi,Bahman Mehri 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.61 No.1
Prediction of the characteristics of both in-plane and out-of-plane elastic waves within conducting nanoplates in the presence of bidirectionally in-plane magnetic fields is of interest. Using Lorentz’s formulas and nonlocal continuum theory of Eringen, the nonlocal elastic version of the equations of motion is obtained. The frequencies as well as the corresponding phase and group velocities pertinent to the in-plane and out-of-plane waves are analytically evaluated. The roles of the strength of in-plane magnetic field, wavenumber, wave direction, nanoplate’s thickness, and small-scale parameter on characteristics of waves are discussed. The obtained results show that the in-plane frequencies commonly grow with the in-plane magnetic field. However, the transmissibility of the out-of-plane waves rigorously depends on the magnetic field strength, direction of the propagated transverse waves, small-scale parameter, and thickness of the nanoplate. The criterion for safe transferring of the out-of-plane waves through the conducting nanoplate immersed in a bidirectional magnetic field is also explained and discussed.
Axial buckling scrutiny of doubly orthogonal slender nanotubes via nonlocal continuum theory
Keivan Kiani 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.10
Using nonlocal Euler-Bernoulli beam theory, buckling behavior of elastically embedded Doubly orthogonal single-walled carbonnanotubes (DOSWCNTs) is studied. The nonlocal governing equations are obtained. In fact, these are coupled fourth-order integroordinarydifferential equations which are very difficult to be solved explicitly. As an alternative solution, Galerkin approach in conjunctionwith assumed mode method is employed, and the axial compressive buckling load of the nanosystem is evaluated. For DOSWCNTswith simply supported tubes, the influences of the slenderness ratio, aspect ratio, intertube free space, small-scale parameter, and propertiesof the surrounding elastic matrix on the axial buckling load of the nanosystem are addressed. The proposed model could be consideredas a pivotal step towards better understanding the buckling behavior of more complex nanosystems such as doubly orthogonalmembranes or even jungles of carbon nanotubes.
Overlap Frequency Domain Equalization for Wavelet OFDM
Sohaib Kiani,Sabia Baig,M. Junaid Mughal 대한전자공학회 2009 ITC-CSCC :International Technical Conference on Ci Vol.2009 No.7
Wavelet-OFDM is a promising alternative to the well established Fourier Transform based OFDM (DFT-OFDM). The Wavelet OFDM does not utilize Cyclic Prefix, due to which its symbols are no longer cicularly convolved, thereby producing Inter Block Interference, after transmission through the channel. In this paper Overlap Frequency Domain Equalizer has been used to minimize BER, due to residual Inter Block Interference for Wavelet-OFDM. Moreover, BER performance has been compared between Wavelet OFDM with Overlap-FDE, DFT-OFDM without Gaurd Interval and Overlap FDE, Conventional OFDM with Gaurd Interval and simple FDE.
Keivan Kiani 한국물리학회 2013 Current Applied Physics Vol.13 No.8
Thanks to the brilliant mechanical properties of single-walled carbon nanotubes (SWCNTs), they are suggested as high speed nanoscale vehicles. To date, various aspects of vibrations of SWCNTs have been addressed; however, vibrations and instabilities of moving SWCNTs have not been thoroughly assessed. Herein, vibrational properties of an axially moving SWCNT with simply supported ends are studied using nonlocal Rayleigh beam theory. Employing assumed mode and Galerkin methods, the discrete governing equations pertinent to longitudinal, transverse, and torsional motions of the moving SWCNT are obtained. The resulting eigenvalue equations are then numerically solved. The speeds corresponding to the initiation of the instability within the moving nanostructure are calculated. The roles of the speed of the moving SWCNT, small-scale parameter, and aspect ratio on the characteristics of longitudinal, transverse,and torsional vibrations of axially moving SWCNTs are scrutinized. The obtained results show that the appearance of the small-scale parameter would result in the occurrence of both divergence and flutter instabilities at lower levels of the speed.
M. Kiani Zitani,M. Rezvani,R. Asadi Tabrizi 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.1
CaO-SiO2-Na2O-MgO glass-ceramics containing Fe2O3 and ZnO were prepared using conventional melting of batch powders, quenching the molten glass in water and crystallization of sintered glass powder. FTIR spectroscopy exhibited main peaks at 930 cm−1 and 950 cm−1 are the characterizations of [SiO4]−2 and [SiO4]−1 bands of glassy network, respectively. XRD patterns introduce Wollastonite and Akermanite as two main crystallized phases of sintered glass-ceramics. Fe2O3 additive resulted in crystallization of Wollastonite more than ZnO additive. Also glass ceramics containing Fe2O3 exhibited sinterability better than ZnO glass ceramics. Consequently, dielectric properties of glass ceramics were measured via a network analyzer at 9 GHz. The bulks of Glass Ceramics showed low dielectric constant and dielectric loss, εr = 5.5 - 7.4 and tgδ = 0.001 - 0.009 respectively. SEM micrograph of glass ceramic samples and glasses depicted morphology of Wollastonite and phase separation respectively.
Keivan Kiani 한국물리학회 2014 Current Applied Physics Vol.14 No.8
Free dynamic analysis of transverse motion of vertically aligned stocky ensembles of single-walled carbon nanotubes is of particular interest. A linear model is developed to take into account the van der Waals forces between adjacent SWCNTs because of their bidirectional transverse displacements. Using Hamilton's principle, the discrete equations of motion of free vibration of the nanostructure are obtained based on the nonlocal Rayleigh, Timoshenko, and higher-order beam theories. The application of such discrete models for frequency analysis of highly populated ensembles would be associated with so much computational effort. To overcome such a problem, some useful nonlocal continuous models are established. The obtained results reveal that the newly developed models can successfully capture the predicted fundamental frequencies of the discrete models. Through various numerical studies, the roles of slenderness ratio, radius of the SWCNT, small-scale parameter, population of the ensemble, and intertube distance on the fundamental flexural frequency of the nanostructure are examined and discussed. The capabilities of the proposed nonlocal continuous models in predicting flexural frequencies of the nanostructure are also addressed.