با سلام خدمت کاربران در صورتی که با خطای سیستم پرداخت بانکی مواجه شدید از طریق کارت به کارت (6037997535328901 بانک ملی ناصر خنجری ) مقاله خود را دریافت کنید (تا مشکل رفع گردد).
ردیف | عنوان | نوع |
---|---|---|
1 |
Understanding the effect of surfactants on two-phase flow using computer vision
درک اثر سورفکتانت ها بر جریان دو فازی با استفاده از بینایی کامپیوتر-2022 The effect of surfactants on vertical gas-liquid flow is experimentally investigated in a 12.7 mm diameter
tube at conditions relevant to an ammonia-water bubble absorber. The characteristics of two-phase flow
are studied using an air-water mixture, both with and without the addition of 1-octanol as the surfac-
tant. High-speed videography is used to study the flow patterns and quantify interfacial areas and bubble
velocities. Novel computer vision-based methods are used to analyze and quantify these flow parame-
ters. The addition of 1-octanol results in enhancement in interfacial area due to the prevention of bubble
coalescence leading to many small diameter bubbles. Measured values of interfacial area are compared
with predictions from correlations in the literature, and agreement and differences are interpreted and
discussed. The bubble velocity is measured by object tracking using the optical flow method. Surfactants
lead to a decrease in bubble velocity and increase in the residence time. These are surmised to be due
to the shear stresses caused by the non-uniform concentration distribution of surfactant along the bub-
ble surface. Overall, the addition of surfactants can lead to appreciable enhancement in heat and mass
transfer rates due to their effect on interfacial areas and residence times. keywords: سورفکتانت ها | جریان دو فازی | ناحیه رابط | سرعت | تقویت | تجسم جریان | Surfactants | Two-phase flow | Interfacial area | Velocity | Enhancement | Flow visualization |
مقاله انگلیسی |
2 |
Assessing surface drainage conditions at the street and neighborhood scale: A computer vision and flow direction method applied to lidar data
ارزیابی شرایط زهکشی سطحی در مقیاس خیابان و محله: یک روش دید کامپیوتری و جهت جریان اعمال شده به داده های لیدار-2022 Surface drainage at the neighborhood and street scales plays an important role in conveying stormwater and
mitigating urban flooding. Surface drainage at the local scale is often ignored due to the lack of up-to-date fine-
scale topographical information. This paper addresses this issue by providing a novel method for evaluating
surface drainage at the neighborhood and street scales based on mobile lidar (light detection and ranging)
measurements. The developed method derives topographical properties and runoff accumulation by applying a
semantic segmentation (SS) model (a computer vision technique) and a flow direction model (a hydrology
technique) to lidar data. Fifty lidar images representing 50 street blocks were used to train, validate, and test the
SS model. Based on the test dataset, the SS model has 80.3% IoU and 88.5% accuracy. The results suggest that the
proposed method can effectively evaluate surface drainage conditions at both the neighborhood and street scales
and identify problematic low points that could be susceptible to water ponding. Municipalities and property
owners can use this information to take targeted corrective maintenance actions. keywords: تقسیم بندی معنایی | جهت جریان | لیدار موبایل | زهکشی سطحی | زیرساخت های زهکشی | Semantic segmentation | Flow direction | Mobile lidar | Surface drainage | Drainage infrastructure |
مقاله انگلیسی |
3 |
Multilevel 2-D Quantum Wavelet Transforms
تبدیل موجک کوانتومی دو بعدی چندسطحی-2022 Wavelet transform is being widely used in classical
image processing. One-dimension quantum wavelet transforms
(QWTs) have been proposed. Generalizations of the 1-D QWT
into multilevel and multidimension have been investigated but
restricted to the quantum wavelet packet transform (QWPTs),
which is the direct product of 1-D QWPTs, and there is no transform between the packets in different dimensions. A 2-D QWT
is vital for image processing. We construct the multilevel 2-D
QWT’s general theory. Explicitly, we built multilevel 2-D Haar
QWT and the multilevel Daubechies D4 QWT, respectively. We
have given the complete quantum circuits for these wavelet transforms, using both noniterative and iterative methods. Compared
to the 1-D QWT and wavelet packet transform, the multilevel
2-D QWT involves the entanglement between components in different degrees. Complexity analysis reveals that the proposed
transforms offer exponential speedup over their classical counterparts. Also, the proposed wavelet transforms are used to realize
quantum image compression. Simulation results demonstrate that
the proposed wavelet transforms are significant and obtain the
same results as their classical counterparts with an exponential
speedup.
Index Terms: Multilevel 2-D-Daubechies quantum wavelet transform (QWT) | multilevel 2-D-Haar QWT | quantum image processing. |
مقاله انگلیسی |
4 |
Neural-Network Decoders for Quantum Error Correction Using Surface Codes: A Space Exploration of the Hardware Cost-Performance Tradeoffs
رمزگشاهای شبکه عصبی برای تصحیح خطای کوانتومی با استفاده از کدهای سطحی: کاوش فضایی مبادلات هزینه و عملکرد سخت افزار-2022 Quantum error correction (QEC) is required in quantum computers to mitigate the effect of
errors on physical qubits. When adopting a QEC scheme based on surface codes, error decoding is the most
computationally expensive task in the classical electronic back-end. Decoders employing neural networks
(NN) are well-suited for this task but their hardware implementation has not been presented yet. This work
presents a space exploration of fully connected feed-forward NN decoders for small distance surface codes.
The goal is to optimize the NN for the high-decoding performance, while keeping a minimalistic hardware
implementation. This is needed to meet the tight delay constraints of real-time surface code decoding. We
demonstrate that hardware-based NN-decoders can achieve the high-decoding performance comparable to
other state-of-the-art decoding algorithms whilst being well below the tight delay requirements (≈ 440 ns)
of current solid-state qubit technologies for both application-specific integrated circuit designs (<30 ns) and
field-programmable gate array implementations (<90 ns). These results indicate that NN-decoders are viable
candidates for further exploration of an integrated hardware implementation in future large-scale quantum
computers.
INDEX TERMS: Application-specific integrated circuit (ASIC) | complementary metal-oxide semiconductor (CMOS) | CMOS integrated circuits | combinational circuits | cryo-CMOS decoding | cryogenic electronics | digital integrated circuits, error correction codes | feedforward neural networks (NNs) | field programmable gate array (FPGA) | fixed-point arithmetic | machine learning NNs | pareto analysis | quantum computing | quantum-error-correction (QEC) codes | supervised learning, surface codes (SCs). |
مقاله انگلیسی |
5 |
Quantum Control of Optically Active Artificial Atoms With Surface Acoustic Waves
کنترل کوانتومی اتم های مصنوعی فعال نوری با امواج صوتی سطحی-2022 Surface acoustic waves (SAWs) are a versatile tool for realizing coherent quantum interfaces
between various solid-state qubits spanning microwave to optical frequencies. Through strain, electric, or
magnetic fields associated with acoustic waves, qubit states can be controlled and measured with exquisite
precision for applications in quantum information processing, memory, transduction, and sensing. In this
review, we discuss progress toward quantum control using surface acoustic waves coupled to optically active
artificial atoms, including semiconductor quantum dots (QDs), optically addressable solid-state spins, and
quantum emitters in van der Waals materials. We outline the device, material, and theoretical considerations
for realizing interactions with surface acoustic waves in the quantum regime, summarize the state of the art in
coupling surface acoustic waves to artificial atoms, and provide insight into the current trends and trajectory
of the field.
INDEX TERMS: Quantum dots (QDs) | quantum networking and communications | surface acoustic waves (SAWs). |
مقاله انگلیسی |
6 |
Retargetable Optimizing Compilers for Quantum Accelerators via a Multilevel Intermediate Representation
کامپایلرهای بهینه سازی مجدد قابل هدف گیری برای شتاب دهنده های کوانتومی از طریق یک نمایش میانی چند سطحی-2022 We present a multilevel quantum–classical intermediate representation (IR) that
enables an optimizing, retargetable compiler for available quantum languages.
Our work builds upon the multilevel intermediate representation (MLIR)
framework and leverages its unique progressive lowering capabilities to map
quantum languages to the low-level virtual machine (LLVM) machine-level IR.
We provide both quantum and classical optimizations via the MLIR pattern
rewriting subsystem and standard LLVM optimization passes, and demonstrate
the programmability, compilation, and execution of our approach via standard
benchmarks and test cases. In comparison to other standalone language and
compiler efforts available today, our work results in compile times that are
1,000 faster than standard Pythonic approaches, and 5–10 faster than
comparative standalone quantum language compilers. Our compiler provides
quantum resource optimizations via standard programming patterns that result
in a 10 reduction in entangling operations, a common source of program
noise. We see this work as a vehicle for rapid quantum compiler prototyping.
|
مقاله انگلیسی |
7 |
Accounting research and the significance test crisis
تحقیقات حسابداری و بحران آزمون اهمیت-2021 The emerging or at least threatening ‘‘significance test crisis” in accounting has been
prompted by a chorus across multiple physical and social sciences of dissatisfaction with
conventional frequentist statistical research methods and behaviors, particularly the use
and abuse of p-levels. There are now hundreds of published papers and statements,
echoing what has been said behind closed doors for decades, namely that much if not
most empirical research is unreliable, simply wrong or at worst fabricated. The problems
are a mixture of flawed statistical logic (as Bayesians have claimed for decades), ‘‘phacking” by way of fishing for significant results and publications, selective reporting or
‘‘the file drawer problem”, and ultimately the ‘‘agency problem” that researchers charged
by funding bodies (their Universities, governments and taxpayers) with conducting
disinterested ‘‘objective science” are motivated more by the personal need to publish
and please other researchers. Expanding on that theme, the supply of empirical research
in the ‘‘market for statistical significance” is described in terms of ‘‘market failure” and
‘‘the market for lemons”.
keywords: تحقیق حسابداری تجربی | آزمایشات | بحران تکثیر | سطحی | گزارش های ثبت شده | Empirical accounting research | Significance tests | Replication crisis | p-levels | p-hacking | Registered reports |
مقاله انگلیسی |
8 |
Refraction seismic complementing electrical method in subsurface characterization for tunneling in soft pyroclastic, (a case study)
روش الکتریکی تکمیلی لرزهای شکست در شناسایی زیرسطحی برای تونلزنی در آذرآواری نرم (مطالعه موردی)-2021 The paper highlights the potential drawback of mapping a single geophysical property for subsurface characterization in potential engineering sites. As an exemplary case study, we present the geophysical survey conducted
along the surface projection of a tunnel in the quaternary volcanic terrain of the Main Ethiopia Rift. Initially,
geoelectrical mapping involving 12 Vertical Electrical Sounding (VES) and a short Electrical Resistivity Imaging
(ERI) line, was carried out. The 1D geoelectric model indicates that the formation resistivity at tunnel zone varies
from 50 to 500 Ω∙m. The corresponding value on 2D model, (>350 Ω∙m), is also compatible. Based on limited
available geological information, the geoelectric horizon was attributed to weathered and variably saturated
ignimbrite. Following unexpected encounter during excavation, refraction seismic and core drilling were carried
out for additional insights. Tomographic analysis of the seismic arrival times revealed that below a depth of 45 m,
(tunnel zone), the velocity substratum is marked by a range, (1200–1800 m/s). Such low velocity range is typical
of unconsolidated materials and, thus, cannot rationalize the geoelectrical attribution (ignimbrite). In a joint
interpretation, the likely formation that may justify the observed range of the electrical resistivity and low P-wave
velocity appears to be unwelded pyroclastic deposit (volcanic ash). Eventually, core samples from the tunnel zone
confirmed the presence of thick ash flow. However, the unexpected ground conditions encountered at the early
phase, due to insufficient information derived from a single geophysical parameter, caused extra cost and
considerable delay.
Keywords: Integrated approach | Refraction seismic | DC resistivity | Subsurface characterization | Main Ethiopian Rift (MER) |
مقاله انگلیسی |
9 |
Data, data flows, and model specifications for linking multi-level contribution margin accounting with multi-level fixed-charge problems
دادهها، جریانهای داده، و مشخصات مدل برای پیوند حسابداری حاشیه سهم چندسطحی با مشکلات شارژ ثابت چندسطحی-2021 This article describes the data, data flows, and spreadsheet
implementations for linking multi-level contribution margin
accounting as a subsystem in cost accounting with several
versions of a multi-level fixed-charge problem (MLFCP), the
latter based on the optimization approach in operations research. This linkage can reveal previously hidden optimization potentials within the framework of multi-level contribution margin accounting, thus providing better information for decision making in companies and other organizations. For the data, plausible fictitious values have been assumed taking into consideration the calculation principles
in cost accounting where applicable. They include resourcerelated data, market-related data, and data from cost accounting needed to analyze the profitability of a companys´
products and organizational entities in the presence of hierarchically structured fixed costs. The data are processed and
analyzed by means of mathematical optimization techniques
and sensitivity analysis. The linkage between multi-level contribution margin accounting and MLFCP is implemented in
three spreadsheet files, including versions for deterministic
optimization, stochastic optimization, and robust optimization. This paper provides specifications for compatible solver
add-ins and for executing sensitivity analysis. The data and spreadsheet implementations described in this article were
used in a research article entitled “Making better decisions
by applying mathematical optimization to cost accounting:
An advanced approach to multi-level contribution margin accounting” [1]. The data sets and the spreadsheet implementations may be reused a) by researchers in management and
cost accounting as well as in operations research and quantitative methods for verification and for further development
of the linkage concept and of the underlying optimization
models; b) by practitioners for gaining insight into the data
requirements, methods, and benefits of the proposed linkage,
thus supporting continuing education; and c) by instructors
in academia who may find the data and spreadsheets valuable for classroom use in advanced courses. The complete
spreadsheet implementations in the form of three ready-touse Excel files (deterministic, stochastic, and robust version)
are available for download at Mendeley Data. They may serve
as customizable templates for various use cases in research,
practice, and education.
keywords: حسابداری هزینه | تحقیق در عملیات | مشکل ثابت شارژ | بهینه سازی | برنامه نویسی صحیح | تجزیه و تحلیل میزان حساسیت | بهینه سازی تصادفی | صفحه گسترده | Cost accounting | Operations research | Fixed-charge problem | Optimization | Integer programming | Sensitivity analysis | Stochastic optimization | Spreadsheet |
مقاله انگلیسی |
10 |
The role of nature of knowledge and knowledge creating processes in knowledge hiding: Reframing knowledge hiding
نقش ماهیت دانش و دانش ایجاد فرآیندهای در مخفی کردن دانش: بازسازی دانش پنهان کردن دانش-2021 Knowledge hiding research has traditionally focused on the ways in which knowledge is hidden in the context of
interactions between employees. This study advances knowledge hiding research by highlighting the benefits of
moving away from the dyadic level of analysis to a multilevel analysis across individuals, groups, and organi-
zations. We also elaborate how knowledge hiding is influenced both by the nature of knowledge and by the
modes of knowledge creation in organizations. We propose a theoretical framework that juxtaposes the nature of
knowledge – tacit vs. explicit and component vs. architectural – against the four modes – socialization, exter-
nalization, combination, and internalization – of the knowledge creating process in organizations. The frame-
work developed in our study also enables us to identify four distinct root causes of knowledge hiding in
organizations – functional bias, misaligned incentives, dysfunctional resource allocations, and value
incongruence. keywords: پنهان کردن دانش | یادگیری سازمانی | مدیریت دانش | Knowledge hiding | Organizational learning | Knowledge management |
مقاله انگلیسی |