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ردیف | عنوان | نوع |
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1 |
Measurement-Induced Boolean Dynamics for Open Quantum Networks
دینامیک بولی ناشی از اندازه گیری برای شبکه های کوانتومی باز-2022 In this paper, we study the recursion corresponding
to the measurement outcomes for open quantum networks
under sequential measurements. Open quantum networks are
networked quantum subsystems (e.g., qubits) with the state evolutions described by a continuous Lindblad master equation. When
measurements are performed sequentially along such continuous
dynamics, the quantum network states undergo probabilistic
jumps and the corresponding measurement outcomes can be
described by a vector of probabilistic Boolean variables. The
induced recursion of the Boolean vectors forms a probabilistic
Boolean network. First of all, we show that the state transition
of the induced Boolean network can be explicitly represented
through a real version of the master equation. Next, when the
open quantum dynamics are relaxing in the sense that they
possess a unique equilibrium as a global attractor, structural
properties including absorbing states, reducibility, and periodicity for the induced Boolean network are direct consequences
of this relaxing property. Particularly, we show that generically,
relaxing quantum dynamics lead to irreducible and aperiodic
chains for the measurement outcomes. Finally, we show that for
quantum consensus networks which are a type of non-relaxing
open quantum network dynamics, the communication classes of
the measurement-induced Boolean networks are encoded in the
quantum Laplacian of the underlying interaction graph.
Index Terms: quantum networks | open quantum systems | quantum measurements | Boolean networks |
مقاله انگلیسی |
2 |
On the Capacity of Quantum Private Information Retrieval From MDS-Coded and Colluding Servers
در مورد ظرفیت بازیابی اطلاعات خصوصی کوانتومی از سرورهای کدگذاری شده و تبانی MDS-2022 In quantum private information retrieval (QPIR),
a user retrieves a classical file from multiple servers by downloading quantum systems without revealing the identity of the file. The
QPIR capacity is the maximal achievable ratio of the retrieved file
size to the total download size. In this paper, the capacity of QPIR
from MDS-coded and colluding servers is studied for the first
time. Two general classes of QPIR, called stabilizer QPIR and
dimension-squared QPIR induced from classical strongly linear
PIR are defined, and the related QPIR capacities are derived.
For the non-colluding case, the general QPIR capacity is derived
when the number of files goes to infinity. A general statement on
the converse bound for QPIR with coded and colluding servers
is derived showing that the capacities of stabilizer QPIR and
dimension-squared QPIR induced from any class of PIR are
upper bounded by twice the classical capacity of the respective
PIR class. The proposed capacity-achieving scheme combines the
star-product scheme by Freij-Hollanti et al. and the stabilizer
QPIR scheme by Song et al. by employing (weakly) self-dual
Reed–Solomon codes.
Index Terms: Private information retrieval (PIR) | information theoretic privacy | quantum information theory | capacity. |
مقاله انگلیسی |
3 |
Making the invisibles visible: Including animals in sustainability (and) accounting
قابل مشاهده کردن نامرئی ها: شامل حیوانات در حسابداری و پایداری-2021 In this essay we draw attention to a crisis that touches upon a great number of individuals:
the plight of non-human animals. Billions of farmed animals are slaughtered each year to
produce for instance food and clothes, while wild animals experience various degrees of
human-induced harms. Yet, non-human animals are largely invisible in discussions of
sustainability and associated accounting efforts. This is due to a problematic ontology
that leaves domesticated animals hovering between society and nature while grouping
wild animals with their habitats and inanimate things. Our purpose is to consider how
to make animals visible in sustainability (and) accounting. To that end, we first illustrate
how sociology and philosophy, among other disciplines, have begun to shift towards the
view that non-human animals are worthy of our moral, political and legal consideration.
We then develop a view of sustainability that explicitly includes animals and introduce
an accounting framework with examples of indicators to track progress from no rights
to fundamental rights for non-human animals.
keywords: حقوق حیوانات | رفاه حیوانات | شاخص ها | پایداری | Animal rights | Animal welfare | Indicators | Sustainability |
مقاله انگلیسی |
4 |
Chemical adsorption on 2D dielectric nanosheets for matrix free nanocomposites with ultrahigh electrical energy storage
جذب شیمیایی روی نانوصفحات دی الکتریک دوبعدی برای نانوکامپوزیت های بدون ماتریس با ذخیره انرژی الکتریکی فوق العاده بالا-2021 Relaxor ferroelectric polymers display great potential in capacitor dielectric applications because of their
excellent flexibility, light weight, and high dielectric constant. However, their electrical energy storage
capacity is limited by their high conduction losses and low dielectric strength, which primarily originates
from the impact-ionization-induced electron multiplication, low mechanical modulus, and low thermal
conductivity of the dielectric polymers. Here a matrix free strategy is developed to effectively suppress
electron multiplication effects and to enhance mechanical modulus and thermal conductivity of a dielectric polymer, which involves the chemical adsorption of an electron barrier layer on boron nitride
nanosheet surfaces by chemically adsorbing an amino-containing polymer. A dramatic decrease of leakage current (from 2.4 106 to 1.1 107 A cm2 at 100 MV m1) and a substantial increase of breakdown strength (from 340 to 742 MV m1) were achieved in the nanocompostes, which result in a
remarkable increase of discharge energy density (from 5.2 to 31.8 J cm3). Moreover, the dielectric
strength of the nanocomposites suffering an electrical breakdown could be restored to 88% of the original
value. This study demonstrates a rational design for fabricating dielectric polymer nanocomposites with
greatly enhanced electric energy storage capacity.
Keywords: Boron nitride nanosheets | Electron barrier layer | Relaxor ferroelectric polymers | Nanocomposites | Electrical energy storage |
مقاله انگلیسی |
5 |
Evaluation of infrared thermography combined with behavioral biometrics for estrus detection in naturally cycling dairy cows
ارزیابی ترموگرافی مادون قرمز همراه با بیومتریک رفتاری برای تشخیص فحلی در گاوهای شیری دوچرخه سواری طبیعی-2021 Low estrus detection rates (>50%) are associated to extended calving intervals, low economic profit and
reduced longevity in Holstein dairy cows. The objective of this study was to evaluate the accuracy of
infrared thermography and behavioral biometrics combined as potential estrus alerts in naturally (not
induced) cycling dairy cows housed in a tie-stall barn. Eighteen first lactation cows were subjected to
transrectal ultrasonography to determine spontaneous ovulation. The dominant follicle (DF) disappearance was used retrospectively as an indirect indicator of ovulation, and to establish the estrus period
(48–24 h prior the DF disappearance). Raw skin temperature (Raw IR) and residual skin temperature
(Res IR) were recorded using an infrared camera at the Vulva area with the tail (Vtail), Vulva area without
the tail (Vnotail), and Vulva’s external lips (Vlips) at AM and PM milking from Day 14 until two days after
ovulation was confirmed. Behavioral biometrics were recorded on the same schedule as infrared scan.
Behavioral biometrics included large hip movements (L-hip), small hip movements (S-hip), large tail
movements and small tail movements to compare behavioral changes between estrus and nonestrus
periods. Significant increases in Raw IR skin temperature were observed two days prior to ovulation
(Vtail; 35.93 ± 0.27 C, Vnotail; 35.59 ± 0.27 C, and Vlips; 35.35 ± 0.27 C) compared to d 5
(Proestrus; Vtail; 35.29 ± 0.27 C, Vnotail; 34.93 ± 0.31 C, and Vlips; 34.68 ± 0.27 C). No significant
changes were found for behavioral parameters with the exception of S-hip movements, which increased
at two days before ovulation (d 2; 11.13 ± 1.44 Events/5min) compared to d 5 (7.30 ± 1.02
Events/5min). To evaluate the accuracy of thermal and behavioral biometrics, receiver operating characteristic curve analysis was performed using Youden index (YJ), diagnostic odds ratio, positive likelihood
ratio (LR+), Sensitivity, Specificity and Positive predicted value to score the estrus alerts. The greatest
accuracy achieved using thermal parameters was for Res IR Vtail PM (YJ = 0.34) and L-hip PM
(YJ = 0.27) for behavioral biometrics. Combining thermal and behavioral parameters did not improve
the YJ index score but reduced the false-positive occurrence observed by increasing the diagnostic odds
ratio (26.62), LR+ (12.47), Specificity (0.97) and positive predicted value (0.90) in a Res IR Vtail PM, S-hip
AM, S-hip PM combination. The combination of thermal and behavioral parameters increased the accuracy of estrus detection compared to either thermal or behavioral biometrics, independently in naturally
cycling cows during milking.
Keywords: Combined-parameters | First-lactating | Movement-frequency | Preovulation | Skin temperature |
مقاله انگلیسی |
6 |
Cardiac biometric variables and arrhythmic events during COVID-19 pandemic lockdown in patients with an implantable cardiac monitor for syncope work-up
متغیرهای بیومتریک قلب و رویدادهای آریتمی در طول قرنطینه همه گیر COVID-19 در بیماران دارای مانیتور قلبی قابل کاشت برای کار سنکوپ-2021 Aim: To assess the changes induced by the COVID-19 lockdown on cardiac biometric variables recorded
using an implantable cardiac monitor (ICM) in a patient population monitored for syncope work-up, as
well to assess whether there has been an effect on arrhythmic events among the patients.
Methods: Longitudinal cohort study. We included 245 adult patients monitored with an ICM indicated
for the investigation of syncope. The records from days 1 to 12 March 2020 (prior to the institution of
lockdown by the state government) with days 16 to 28 March 2020 were compared.
Results: Daily physical exercise reduced markedly after the imposition of lockdown (132 [55–233] minutes vs. 78 [21–154] minutes). The mean daytime HR prior to lockdown was 77 [69–85] bpm, whereas
during lockdown it was 74 [66–81] bpm. During the lockdown period, a drop in the variability in heart
rate (114 [94–136] ms vs. 111 [92–133] ms) was observed. Although the incidence of AF was similar over
both periods, the daily AF burden was significantly higher post-lockdown (405 [391–425] minutes vs.
423 [423–537] minutes). No differences in the number of other arrhythmias were found.
Conclusions: The establishment of mandatory lockdown has led to a marked drop in daily physical activity in this population which probably explains changes observed in other cardiac biometric variables.
Although, in the short term, we have not documented an increased risk of arrhythmia, we cannot rule
out an effect in the medium to long term or in other populations of at-risk patients. Keywords: COVID-19 | Lockdown | Physical exercise | Arrhythmic burden |
مقاله انگلیسی |
7 |
The optimal recovery-fund based strategy for uncertain supply chain disruptions: A risk-averse two-stage stochastic programming approach
استراتژی مبتنی بر صندوق بازیابی بهینه برای اختلالات نامشخص زنجیره تأمین: رویکرد برنامه ریزی تصادفی دو مرحله ای ریسک پذیر-2021 For a supply chain subject to uncertain production disruptions, the joint optimization of invest- ment intervention on recovery speed and duration of disrupted production capacity and location and inventory management has not been well studied. In this paper, a novel recovery strategy is introduced and studied, which uses investment to adjust the recovery speed and duration of production capacity, and two recovery behaviors responding to different types of disruptions are modeled. Considering uncertain disruption scenarios and their ripple effects over the supply chain, a risk-averse two-stage stochastic programming model (RTSPM) is established to study the integrated supply chain management of selection of distribution centers, multi-period inventory, transportation flows, and recovery-fund based mitigation policy. The RTSPM incorporates the risk preference of managers in decision making. We propose a trust-region-based decomposition method to solve the RTSPM and demonstrate its efficiency by benchmarking on state-of-the-art commercial solvers. Through numerical examples, we deeply analyze the effectiveness of RTSPM and the relations of optimal recovery investment decisions with the uncertain disruption factors. Finally, we provide implications and suggestions induced from the models and findings to aid the decisions on renting of distribution centers and the emergency investment and operational decisions when suffering the disruptions. Keywords: Supply chain disruption management | Recovery-fund based mitigation strategy | Location-inventory-transportation model | Risk-averse two-stage stochastic programming | Trust-region-based decomposition method |
مقاله انگلیسی |
8 |
Knowledge of Opioid-induced Respiratory Depression Among Chinese Healthcare Professionals:A Cross-Sectional Study
شناخت افسردگی تنفسی ناشی از مواد مخدر در میان متخصصان مراقبت های بهداشتی چینی: یک مطالعه مقطعی-2021 Purpose: The purposes of this study were to measure knowledge about opioid-induced
respiratory depression (OIRD) among Chinese healthcare professionals and to explore
the associated factors that influence Chinese healthcare professionals’s knowledge
Methods: A cross-sectional survey was conducted. A convenience sample of 90 0 Chinese healthcare professionals from 21 provinces, 4 municipalities, and 4 a utonomous regions was used. The OIRD knowledge questionnaire, which is a s elf-designed questionnaire based on evidence, was used to judges the degree of knowledge among Chinese healthcare professionals according to the accuracy r ate. The questionnaire included questions on 6 dimensions of knowledge. Socio -demographic characteristics were also measured by amulti-item questionnaire. Results: The mean accuracy and correct response rate range on the OIRD kno wledge questionnaire for all participants were 64.5±10.0% and 20%-100%, resp ectively. According to univariate analysis, Chinese healthcare professionals’ OIR D knowledge was positively correlated with age, region, profession, hospital lev el, type of hospitals and departments, education level, years of clinical working, and clinical practice of chronic cancer pain management. Multiple linear regress ion analysis showed differences in professions and regions.( all p<0. 0 5) . Conclusions Most Chinese healthcare professionals had misconceptions about O IRD and lacked relevant knowledge. We should assign importance to developin g targeted training programs and exploring feasible and effective training metho ds. keywords: Cancer pain | Opioid-induced respiratory depression | Knowledge | Healthcare professionals | Opioid-induced adverse |
مقاله انگلیسی |
9 |
A simplified method to account for vertical human-structure interaction
یک روش ساده برای تعامل با ساختار عمودی انسان-2021 To account for vertical human-structure interaction (HSI) in the vibration serviceability analysis, the contact
force between the pedestrian and the structure can be modelled as the superposition of the force induced by the
pedestrian on a rigid surface and the force resulting from the mechanical interaction between the structure and
the human body. For the case of large crowds, this approach leads to (time-variant) models with a very high
number of degrees of freedom (DOFs). To simplify analysis, this paper investigates the performance of an
equivalent single-degree-of-freedom approach whereby the effect of HSI is translated into an effective natural
frequency and modal damping ratio for each mode of the supporting structure. First, the numerical study con-
siders a footbridge structure that is modelled as a simply-supported beam for which only the fundamental
vertical bending mode is taken into account. For a relevant range of structure and crowd parameters, the
comparison is made between the structural response predicted by the simplified model and the more accurate
reference model that accounts for all DOFs of the coupled crowd-structure model. Where the simplified model is
found to underestimate the structural response, although to a limited extent, this is compensated for by intro-
ducing a correction factor for the effective damping ratio. Second, the performance of the simplified method is
evaluated through the application on a real footbridge. The results show that the simplified method allows for a
good and mildly conservative estimate of the structural acceleration response that is within 10–20% of the
predictions of the reference crowd-structure model. keywords: ارتعاشات ناشی از انسان | تعامل ساختار انسانی | پایه | قابلیت ارتعاش | Human-induced vibrations | Human-structure interaction | Footbridge | Vibration serviceability |
مقاله انگلیسی |
10 |
Coupled elasto-viscoplastic and damage model accounting for plastic anisotropy and damage evolution dependent on loading conditions
الاستو ویسکوپلاستیک همراه و مدل آسیب محاسبه ناهمسانگردی پلاستیک و تکامل آسیب وابسته به شرایط بارگذاری-2021 This work presents an unconventional fully coupled elasto-viscoplastic and damage constitutive model that is suitable for
investigating the failure mechanism of metallic materials. The constitutive equations are developed within a finite elastoplasticity
framework under the assumption of hypoelastic-based plasticity. Anisotropic plastic potential and plastic-induced anisotropy
are modelled by means of the Hill48 yield criterion and a Chaboche-type non-linear kinematic hardening law, respectively. A
modified Voce-type law is assumed for the isotropic hardening behaviour. A novel law is proposed to account for an evolution of
the damage depending on the loading directions. The proposed model was implemented via user subroutine for the commercial
finite elements (FE) software Abaqus/Standard and used for the prediction of the cyclic failure of lead-free solder materials, the
crack formation in anisotropic AISI 316L steel specimens and the description of the failure behaviour of carbon steel notched
round bars and flat grooved plates.
Keywords: Rate-dependent plasticity | Damage anisotropic evolution | Plastic anisotropy | Kinetic logarithmic spin | Hypoelastic-based plasticity |
مقاله انگلیسی |