Hierarchical approach to 'atomistic' 3-D MOSFET simulation

We present a hierarchical approach to the 'atomistic' simulation of aggressively scaled sub-0.1-μm MOSFETs. These devices are so small that their characteristics depend on the precise location of dopant atoms within them, not just on their average density. A full-scale three-dimensional drift-diffusion atomistic simulation approach is first described and used to verify more economical, but restricted, options. To reduce processor time and memory requirements at high drain voltage, we have developed a self-consistent option based on a solution of the current continuity equation restricted to a thin slab of the channel. This is coupled to the solution of the Poisson equation in the whole simulation domain in the Gummel iteration cycles. The accuracy of this approach is investigated in comparison to the full self-consistent solution. At low drain voltage, a single solution of the nonlinear Poisson equation is sufficient to extract the current with satisfactory accuracy. In this case, the current is calculated by solving the current continuity equation in a drift approximation only, also in a thin slab containing the MOSFET channel. The regions of applicability for the different components of this hierarchical approach are illustrated in example simulations covering the random dopant-induced threshold voltage fluctuations, threshold voltage lowering, threshold voltage asymmetry, and drain current fluctuations

Constraints on the Growth and Spin of the Supermassive Black Hole in M32 From High Cadence Visible Light Observations

We present 1-second cadence observations of M32 (NGC221) with the CHIMERA instrument at the Hale 200-inch telescope of the Palomar Observatory. Using field stars as a baseline for relative photometry, we are able to construct a light curve of the nucleus in the g-prime and r-prime band with 1sigma=36 milli-mag photometric stability. We derive a temporal power spectrum for the nucleus and find no evidence for a time-variable signal above the noise as would be expected if the nuclear black hole were accreting gas. Thus, we are unable to constrain the spin of the black hole although future work will use this powerful instrument to target more actively accreting black holes. Given the black hole mass of (2.5+/-0.5)*10^6 Msun inferred from stellar kinematics, the absence of a contribution from a nuclear time-variable signal places an upper limit on the accretion rate which is 4.6*10^{-8} of the Eddington rate, a factor of two more stringent than past upper limits from HST. The low mass of the black hole despite the high stellar density suggests that the gas liberated by stellar interactions was primarily at early cosmic times when the low-mass black hole had a small Eddington luminosity. This is at least partly driven by a top-heavy stellar initial mass function at early cosmic times which is an efficient producer of stellar mass black holes. The implication is that supermassive black holes likely arise from seeds formed through the coalescence of 3-100 Msun mass black holes that then accrete gas produced through stellar interaction processes.Comment: 8 pages, 3 figures, submitted to the Astrophysical Journal, comments welcom

Induction of Mutation in Rough Lemon (Citrus jambhiri Lush.) Using Gamma Rays

The present investigation was carried out to study variability induced by gamma rays with respect to vegetative characters and LD50 dose in Rough lemon. Rough lemon seeds were gamma irradiated at doses of 0, 4, 6 and 8 kr along with control. Seed germination decreased with increasing dose of gamma radiation. Seedling height and leaf size also decreased with increasing dose of gamma radiation, whereas, apical branching, number of branches/seedling, number of variegated / albino seedlings and number of leaves increased with increasing dose of gamma radiation. Maximum variability for seedling height, number of leaves, leaf size, colour, internode length, and per cent apical branching was observed at two months from sowing in seeds treated with 8 kr dose of gamma radiation. Variability for all characters was, however, found to be minimum in the control

Effect of Ply Orientation on Strength and Failure Mode of Pin Jointed Unidirectional Glass-epoxy Nanoclay Laminates

In the present work the effect of the different ply orientations and nano filler on the bearing strength and failure mode of the pin joints is investigated both experimentally and numerically. Glass-epoxy composite laminates were prepared with [0°/45°/90°], [0°/45°/0°] and [0°/90°/0°] ply orientations. Nanoclay filler with 1, 2, 3, 4 and 5wt% were added in the epoxy for the said orientations to prepare the pin joints. Results show that the strength of the pin joints is drastically dependent on both ply orientations and nanofiller wt%. The joint geometry i.e., the distance from the free edge of specimen to the diameter of the hole (E/D) ratio and width of the specimen to the diameter of the holes (W/D) ratio were also investigated which effected the failure mode of the joints. Tsai-Wu failure theory along with the characteristics curve method was used for the prediction of failure modes numerically

Identification of Microbial Population during Oil Palm Frond (OPF) Composting using Light and Scanning Electron Microscopy

This investigation highlights the activity and diversity of fungal population observed on oil palm fronds (OPF) during composting process employing Scanning Electron Microscope (SEM) and conventional identification methods. Composting is a controlled biological decomposition process, which converts organic wastes into humus-like material. It is a process that involves microbial degradation of complex organic materials under moist, self-heating and aerobic conditions; and characterized by a succession of various microbial populations. Two white rot fungi species were introduced as inoculant, namely Trametes versicolor and Schizophyllum commune. The main objective for inoculation was to shorten the composting period and produce high quality compost. In this study, the oil palm fronds (OPF) were composted for 14 weeks, with four treatment; i) control (untreated OPF), ii) OPF treated with T. versicolor, iii) OPF treated with S. commune, iv) OPF treated with both T. versicolor and S. commune, and four replicates for each. A total of eight genera of fungi namely Aspergillus, Trichoderma, Absidia, Geotrichum, Trametes, Schizophyllum, Syncephalastrum and Beauveria species were isolated and identified from composted OPF. Although T. versicolor and S. commune were introduced as accelerating agents, the presence of other fungal species perhaps occurred due to the indigenous microflora that already existed on OPF, leading  to a succession of various fungi species based on the complexity of biological process in composting substrate. Keywords: Composting, oil palm frond, white-rot fungi, inoculants, Trametes versicolor, Schizophyllum commune ABSTRAKKajian ini menumpukan kepada aktiviti dan kepelbagaian populasi kulat yang terdapat pada pelepah sawit sepanjang tempoh pengkomposan, dengan menggunakan Mikroskop Elektron Pengimbas (SEM) dan teknik identifikasi konvensional. Pengkomposan merupakan proses penguraian biologi terkawal, yang menukarkan sisa organik kepada bahan-seperti-humus. Ia adalah suatu proses yang melibatkan penguraian mikrob terhadap bahan organik kompleks dalam keadaan lembap, pemanasan-diri dan aerobik; dan proses ini dicirikan oleh sesaran pelbagai jenis populasi mikrob. Dua spesies kulat pereput putih iaitu Trametes versicolor dan Schizophyllum commune telah diperkenalkan sebagai inokula dalam pengkomposan pelepah sawit. Objektif utama inokulasi adalah untuk memendekkan tempoh pengkomposan dan menghasilkan kompos berkualiti tinggi. Dalam kajian ini, pelepah sawit dikomposkan selama 14 minggu, dengan empat rawatan yang digunakan iaitu; i) kawalan (pelepah tidak dirawat), ii) pelepah dirawat dengan T. versicolor, iii) pelepah dirawat dengan S. commune, iv) pelepah dirawat dengan T. versicolor dan S. commune, dengan empat replikasi. Secara keseluruhannya, terdapat lapan genus kulat, iaitu Aspergillus, Trichoderma, Absidia, Geotrichum, Trametes, Schizophyllum, Syncephalastrum dan Beauveria telah diasingkan dan dikenalpasti dalam kompos pelepah sawit. Walaupun T. versicolor dan S. commune telah diperkenalkan sebagai agen pecutan, kehadiran pelbagai populasi kulat lain mungkin dipengaruhi oleh mikroflora semulajadi yang hadir dalam substrat pengkomposan, serta proses sesaran pelbagai spesies kulat yang bergantung kepada proses biologi kompleks yang berlaku dalam substrat pengkomposan.  Kata kunci: Pengkomposan, pelepah sawit, kulat pereput putih, inokula, Trametes versicolor, Schizophyllum commun

Effect of Metallic Inserts on the Strength of Pin Joints Prepared from Glass Fiber Reinforced Composites

The present study deals with the failure analysis of pin joints by varying different geometric parameters i.e., edge distance to hole diameter (E/D) ratio and width to hole diameter (W/D) ratio. Pin joints were prepared from the glass fiber reinforced laminates incorporating the metal inserts. A range of 2 to 5 and 3 to 6 was considered for E/D and W/D ratios, respectively. The stress around the hole was redistributed by incorporating the metal inserts in the hole to increase the load carrying capacity. To predict the failure loads and failure modes numerically, progressive damage analysis along with Hashin failure criteria was used in the pin joints. Strength of the pin joints increased in the range of 65 per cent to 92 per cent with metal insert due to the redistribution of the stresses around the hole. Progressive damage analysis gave a good correlation with experimental findings. Thereafter, the strength of the joint was predicted by varying the thickness of the metal inserts

SECURE INTERNET OF THINGS (IOT) FIRMWARE UPGRADES IN A WIRELESS NETWORK

Internet of Things (IoT) devices/sensors/endpoints (collectively and generally IoT devices) are becoming part and parcel of many establishments. With the inbuilt support for Wi-Fi 6, also known as “AX Wi-Fi or 802.11ax Wi-Fi,” in many IoT devices, the number of deployed IoT devices will continue grow. Wi-Fi® is trademark of the Wi-Fi Alliance. These IoT devices come from various manufacturers and will require network/Internet access for firmware upgrades. As such, there is a need to create a secure and tested firmware upgrade environment for such devices. Presented herein are techniques to track the firmware of IoT devices and use Manufacturer Usage Descriptions (MUD) to recognize the recommended firmware and settings. Further, the techniques presented herein include a mechanism to optimize firmware upgrades using Target Wake Time (TWT) scheduling

Orbital Degeneracy and Peierls Instability in Triangular Lattice Superconductor Ir1−x_{1-x}Ptx_xTe2_2

We have studied electronic structure of triangular lattice Ir$_{1-x}$Pt$_x$Te$_2$ superconductor using photoemission spectroscopy and model calculations. Ir $4f$ core-level photoemission spectra show that Ir $5d$ $t_{2g}$ charge modulation established in the low temperature phase of IrTe$_2$ is suppressed by Pt doping. This observation indicates that the suppression of charge modulation is related to the emergence of superconductivity. Valence-band photoemission spectra of IrTe$_2$ suggest that the Ir $5d$ charge modulation is accompanied by Ir $5d$ orbital reconstruction. Based on the photoemission results and model calculations, we argue that the orbitally-induced Peierls effect governs the charge and orbital instability in the Ir$_{1-x}$Pt$_x$Te$_2$.Comment: 5 pages,4 figure

Blockchain-based raw material shipping with PoC in Hyperledger Composer

In today’s world, a lot of various kinds of raw materials are shipped from one place to another as per the requirement of industries. This shipping process involved many multiple levels with multiple personalities or authorities. The intermediates may be influenced by some illegal external factors and there may be some theft or modification in the raw material which is in the shipping process. This generates a significant loss if the material is of high cost. Presently, the advancements in information technology precede a method to restrict this loss and it is blockchain. Blockchain technology is an essential feature in enabling a comprehensive view of events back to origination. The shipping chain of raw materials that provides integrity and tamper resistance for raw materials in the shipping process is proposed in the manuscript. we have also provided proof of concept (PoC) in Hyperledger Composer with performance evaluation.info:eu-repo/semantics/publishedVersio