Virtual Occupancy Research Articles

Synthesis, spectroscopic characterization, electronic elucidation, chemical reactivity, topological and molecular docking investigations of cefadroxil sulfoxide

The cefadroxil sulfoxide (CDSO) para-hydroxy derivative, derived from cefadroxil, has enormous significance in pharmaceutical applications. The cefadroxil sulfoxide (CDSO) compound was synthesized and characterized by spectroscopic (FT-IR, FT-Raman, and UV–Visible) assessments. Computational investigations have been carried out concurrently with a B3LYP-6-311++G(d,p) basis set and density functional theory (DFT). The molecular vibrational assignments, chemical reactivity, electronic properties, and optical activities are calculated using gas and different solvent phases. The stable ground state configuration of the given molecular compound is investigated using PES analysis. Furthermore, the chemical behavior of the CDSO was thoroughly investigated for different solvent aspects through HOMO-LUMO, MEP, UV–Visible and electron-hole excitation analyses. The molecular occupancy, virtual occupancy, and overlapping bonding energies are investigated by TDOS, PDOS, and COOP spectrum studies. Fukui function and dual descriptor investigations extend to the chemical reactivity of individual atomic sites. The intra-molecular analysis provided a deeper understanding of the molecular interactions performed by natural bond orbitals (NBO) and non-linear optics (NLO), which provided optical activity for the title compound. Additionally, electron localization function (ELF), localized orbital locator (LOL), and reduced density gradient (RDG) analyses were also accomplished to provide insight into the delocalized orbitals in the header composite. The molecular docking was achieved, and the ligand with 4EVM protein is providing the potential antimicrobial biological activity (binding energy −7.12 kcal/mol) of the CDSO compound.

Признаки антропологической парадигмы в профессиональном образовании

The paper is of importance due to the developing poly-paradigmatic approach in the pedagogical theory and practice. Diverse content of numerous paradigms influences both, the methodology of bringing up educational issues and solving every-day practical tasks of the educational process. The purpose of the article is to reveal certain signs of the anthropological paradigm and indicate whether it is possible to develop them in professional education. It is mentioned that the dominant educational paradigm is set in accordance with the pattern of the society. Differing approaches to define the number and the content of paradigms in education are compared. It is shown that opposing classical paradigm (in all its variations) to the humanistic one is counter-productive. The idea of the anthropological paradigm having potential to bringing them together is expressed. Some signs of the anthropological paradigm are defined. They are the shift from information to knowledge, technology-advanced professional activity, and virtual occupation. It is shown that the signs mentioned are found in professional education. The conclusion is drawn that in accordance with the inner logic of the system development these spot changes, caused by the signs mentioned are to become the areas of the system’s growth.

Improved RRT* Algorithm-Based Path Planning for Unmanned Aerial Vehicle in a 3D Metropolitan Environment

The unmanned aerial vehicles (UAV’s) are widely used in smart logistic application. The optimal route prediction, however, is a fundamental prerequisite for UAV in commercial applications. This paper introduces an Improved Rapid random tree (IRRT*) algorithm with triangular inequality rewiring technique for finding collision free path for UAVs in a three-dimensional (3D) environment. The 3D building environments for navigation were developed using MATLAB/Simulink 2021, a virtual occupancy grid model. By considering UAV variable elements such as roll angle, air speed, flight path angle, and boundary threshold parameters, the suggested work aims to provide a comparative analysis of sampling algorithm-based optimal path. The proposed route planning control strategy is to identify the violation free path to locate the destination in 3D environment at variable altitude and air speed. Compared to the standard RRT and RRT* algorithms, the proposed IRRT* algorithm can shorten the planning time, reduce the cost distance and improve the algorithm’s applicability in the formation path planning problem. Simulation experiments with two environments and their different situations are carried out to determine the efficiency and performance of the proposed IRRT* algorithm. Statistical investigation supported the effectiveness of the IRRT* approach, which has low computational cost and a smooth travel trajectory that significantly resolves the unmanned aerial vehicle path planning issues in logistic applications.

基于投入产出的中国省际农业水-土-碳足迹流动分析

PDF HTML阅读 XML下载 导出引用 引用提醒 基于投入产出的中国省际农业水-土-碳足迹流动分析 DOI: 10.5846/stxb202107051778 作者: 作者单位: 作者简介: 通讯作者: 中图分类号: 基金项目: 国家自然科学基金项目（41971241）；河南省高校科技创新人才（2021-CX-011）；2020年河南省留学人员科研择优资助项目 The flow analysis of inter-provincial agricultural water, land and carbon footprints in China based on input-output model Author: Affiliation: Fund Project: The National Natural Science Foundation of China (General Program, Key Program, Major Research Plan) 摘要 | 图/表 | 访问统计 | 参考文献 | 相似文献 | 引证文献 | 资源附件 | 文章评论 摘要:水-土-碳多要素耦合研究是近年来资源环境领域的热点之一。开展农业水-土-碳足迹流动分析有助于揭示农业生产和贸易带来的跨区域环境影响，对不同区域资源可持续管理和协同减排具有重要意义。以中国30个省级行政区为研究对象，基于投入产出方法科学识别不同省区农业水、土、碳足迹的空间格局、流动特征及关联状况。主要结论如下：（1）省域尺度农业水、土、碳足迹具有较大的空间差异，这归因于自然条件、社会经济、产业结构、耕作方式及种植结构等的区域差异；（2）农业水、土、碳足迹流动主要从西部和北部流向东部和东南部地区，这与农产品市场供需关系密切相关，表明东部和东南部地区农产品消费导致了西部和北部地区资源的虚拟占用和隐含碳排放；（3）农业水、土、碳足迹及其强度之间存在一定程度的关联关系，经济发展状况、地区产业结构、自然条件状况等因素均会影响某一要素或几种要素的消耗强度，进而影响其关联作用；农业水、土、碳足迹流动表现出明显的关联性特征，空间关联网络存在不均衡性，关联渠道有待丰富；（4）建议未来加强农业技术革新，提高机械化、智能化生产水平；通过土地规模化经营实现水土资源的节约集约利用；开展基于水-土-碳跨区域影响的横向农业生态补偿，实现中国省际协同减排和资源优化。 Abstract:Water-land-carbon nexus is one of the hotspots in resources and environment research in recent years. Studies on the flow tracks of agricultural water, land, carbon footprints can reveal the cross-regional environmental influences bring about by agricultural production and trade, which is of great significance for the optimal allocation and sustainable management of water and land resources and the collaborative carbon emission reduction in different regions. Taking the 30 provincial administrative regions of China as the study cases, this paper calculates the agricultural water, land and carbon footprintss by multi-regional input-output analysis, and scientifically explores and identifies the spatial patterns, flow tracks and correlation characteristics of the agricultural water, land and carbon footprints. The main conclusions are as follows:(1) The spatial patterns of the agricultural water, land and carbon footprint at the provincial scale in China are quite different, which can be attributed to the diversity of natural conditions, social economy, industrial structure, methods of cultivation and planting formation in different regions. (2) From the perspective of the inter-provincial flow tracks, the agricultural water, land and carbon footprints roughly transfer from the western and the northern regions to the eastern and the southeastern regions of China, which is closely related to the supply and demand of agricultural products market. This indicates that the consumption of agricultural products in the eastern and the southeastern regions has led to the virtual occupation of water and land resources and hidden carbon emissions in the western and the northern regions. (3) There are correlations among the agricultural water, land and carbon footprints and the intensities, but the status and degree of correlations vary in different regions. Economic development, regional industrial structure, natural conditions and other factors can affect the consumption intensity of water, land and carbon, which will further affect the correlation between the them. The flow tracks of agricultural water, land, carbon footprints show significant spatial correlation characteristics. The spatial correlation network is unbalanced, and the correlation channels need to be enriched. (4) It is suggested that the agricultural technology innovation in the future should be strengthened, and the level of mechanization utilization and intelligent production should be improved. Large-scale land management should be promoted to realize the economical and intensive utilization of water and land resources. The agricultural ecological compensation measures based on the cross-regional impacts of water-land-carbon nexus should be adopted to realize the cooperation of provinces for the carbon emission reduction and resource optimization in China. 参考文献 相似文献 引证文献

Re:bodying the virtual

This visual essay is composed of an associative thread of images that are sourced from several collaborative projects we (A + R) have conducted over the past six years. The context in which these collaborations took place include a symposium, exhibitions, various video works, and the teaching of a semi-virtual interior design studio in Melbourne. A crucial aspect within these situations was a shared spatial and didactical praxis that was located on opposite sides of the planet?—?Belgium and Australia. The collaboration was thus largely determined by the gaps between A + R: the geographical separation, the physicality or virtuality of site, and the millisecond delay of the video feed. The virtual screen that speared through each interaction meant that the technologies and processes employed were often undulating attempts to minimise these gaps. To compose this visual essay, the image archive of each collaborative project was examined through a peripheral lens, in order to create relations that interrogate the spatial and conceptual implications of bridging this physical distance. The anachronistic approach to the images allowed new forms of configurations to arise, emphasising the specific spatial situations over any previous context or anecdotal chronology. As a consequence, elaborating on the precise details of each project seems to be somewhat beside the point. In fact, prosaic descriptions detract from what is actually important about these interactions. The textual interspersions throughout the essay are attempts to develop a syntax for pointing out what is conceptually relevant. They try to unpack?—?or make more accessible?—?the visual argumentation that the essay is constructed from, without ever claiming or providing unisonal clarity. The words do not function as explanations, but instead as musings that attempt to mark?—?and disclose?—?the various typologies, as well as to narrate the transition between them. They are attempts to describe both the experience of the digital landscape and the terrain itself. In these thematic paragraphs, we have attempted to find language that resonates with the configurations of site that come together through the juxtapositions within the visual sequence. The collected imagery has been curated to lay bare the constituting components of this shared experience within digital space. In this way, the essay as a whole can be read as a subjective taxonomy of our digital communication of place as well as a truly digital simultaneous compression of it into one singular entity. Ultimately, the resulting transmedial constellation of images, text, places, objects, and projects aims to interrogate the kind of interiorities that are generated when two bodies interact from distant locations through predominantly digital platforms. It describes an exchange between the virtual spaces that we occupy and the physicality of the bodies and objects that remain essential for this virtual occupation.

O lugar de objeto e a materialização linguística dos sentidos em fuga

Discutimos neste texto a produtividade do objeto verbal sob a ótica da relação entre as configurações orgânicas da língua e suas projeções de acionamento enunciativo. Defendemos que esse lugar sintático é constituído não apenas por um espaço na arquitetura da sentença, mas também por aspectos enunciativos que se mobilizam para configurá-lo como um lugar capaz de oferecer progressão referencial ao acontecimento posto em cena pelo dizer. De maneira específica, a análise da projeção do lugar de objeto realizada pelo verbo, não obrigatoriamente explícito, demonstra que esse lugar é profícuo para aquilo que Orlandi (2012) nomeia de fuga dos sentidos. Verificamos que a ausência de um objeto explícito não prescinde de uma ocupação virtual por formações nominais que materializem regularidades historicamente delineadas e propomos o conceito de “intercâmbio entre formações nominais”, assumindo

Cyber-Attacks and Freedom of Expression: Coercion, Intimidation and Virtual Occupation

AbstractThis article explores how cyber-attacks affect freedom of expression. It begins by outlining the literature on cyber coercion and exploring other conceptions of how offensive cyber operations have been used to shape adversary behaviour, including efforts to intimidate through cyberspace, and the concept of ‘cyber swaggering’. The article moves on to explore how cyber-attacks have been used to undermine electoral process, to erode free and fair media reporting, and how manipulation of social media can constitute a ‘virtual infiltration’ and ‘virtual occupation’ of the information domain. The article then explores how cyber-attacks conducted during the conflict in Ukraine have limited or otherwise affected freedom of expression. I argue that the wider effects of cyber operations on political, civil and human rights have been underexplored in the cyber security literature; that cyber-attacks have adversely affected freedom of expression in the conflict in Ukraine and in other political disputes; and that the coercion concept is ill-suited to accounting for the socio-psychological impact of modern cyber operations.

Utcanévváltozások Pozsony példáján

In the introduction, the authors briefly outline the history of Bratislava, focusing especially on the momentous events of the 20th century. As a starting point, characteristic groups of 1905 street names are observed concerning motivation, components and semantic background (cf. Ortvay, Pozsony város utcái és terei [Streets and squares in the city of Bratislava]). Special attention is given to street names that can be connected to Hungarian history and culture. The discussion of street name changes in Bratislava is based on the ortvay.eu database; street name changes between the 1920s and the 2010s are examined according to frequency, motivation and time period. Both frequency and motivation are closely related to the above mentioned momentous events, such as repeated fundamental changes in politics and constitutional laws. As a result, they are connected to virtual space occupation; although several streets and squares of the town were renamed not only around regime changes, but within politically coherent time periods. Finally, the authors explore how well the history of the city is represented in the present-day names of streets and squares in Bratislava, and propose similar contrastive studies of the history of street names in towns of other regions.

Virtual occupancy sensors for real-time occupancy information in buildings

This study aims at developing a generic, feasible and low cost occupancy detection solution to provide reliable real-time occupancy information in buildings. Currently, various low cost or even free occupancy measurements are common in offices along with the popularization of information technologies. An information fusion method is proposed to integrate multiple occupancy measurements for reliable real-time occupancy information using the Bayesian belief network (BBN) algorithm. Based on this method, two types of virtual occupancy sensor are developed at room-level and working zone-level respectively. The room level virtual occupancy sensors are composed of physical occupancy sensors, chair sensor, keyboard and mouse amongst others. The working zone-level virtual occupancy sensors are developed based on real-time GPS location and Wi-Fi connection from smart device like smart phones and occupancy access information from building management systems. The developments of these two types of virtual occupancy sensors can be conducted automatically with functions of self-learning, self-performance assessment and fault detection. The performances of the developed virtual sensors are evaluated in two private office rooms. Results show that the developed virtual occupancy sensor are reliable and effective in providing real-time occupancy information. The paper also discusses application of the virtual occupancy sensors for demand driven HVAC operations.

Charge fluctuations in nonlinear heat transport

We show that charge fluctuation processes are crucial for the nonlinear heat conductance through an interacting nanostructure, even far from a resonance. We illustrate this for an Anderson quantum dot accounting for the first two leading orders of the tunneling in a master equation. The often made assumption that off-resonant transport proceeds entirely by virtual occupation of charge states, underlying exchange-scattering models, can fail dramatically for heat transport. The identified energy-transport resonances in the Coulomb blockade regime provide new qualitative information about relaxation processes, for instance by strong negative differential heat conductance relative to the heat current. These can go unnoticed in the charge current, making nonlinear heat-transport spectroscopy with energy-level control a promising experimental tool.

Virtual Occupancy Sensing: Using Smart Meters to Indicate Your Presence

Occupancy detection for buildings is crucial to improving energy efficiency, user comfort, and space utility. However, existing methods require dedicated system setup, continuous calibration, and frequent maintenance. With the instrumentation of electricity meters in millions of homes and offices, however, power measurement presents a unique opportunity for a non-intrusive and cost-effective way to detect occupant presence. This study develops solutions to the problems when no data or limited data is available for training, as motivated by difficulties in ground truth collection. Experimental evaluations on data from both residential and commercial buildings indicate that the proposed methods for binary occupancy detection are nearly as accurate as models learned with sufficient data, with accuracies of approximately 78 to 93 percent for residences and 90 percent for offices. This study shows that power usage contains valuable and sensitive user information, demonstrating a virtual occupancy sensing approach with minimal system calibration and setup.

Long-range spin transfer in triple quantum dots.

Tunneling in a quantum coherent structure is not restricted to only nearest neighbors. Hopping between distant sites is possible via the virtual occupation of otherwise avoided intermediate states. Here we report the observation of long-range transitions in the transport through three quantum dots coupled in series. A single electron is delocalized between the left and right quantum dots, while the center one remains always empty. Superpositions are formed, and both charge and spin are exchanged between the outermost dots. The delocalized electron acts as a quantum bus transferring the spin state from one end to the other. Spin selection is enabled by spin correlations. The process is detected via the observation of narrow resonances which are insensitive to Pauli spin blockade.

Long-distance coherent coupling in a quantum dot array

Controlling long-distance quantum correlations is central to quantum computation and simulation. In quantum dot arrays, experiments so far rely on nearest-neighbour couplings only, and inducing long-distance correlations requires sequential local operations. Here, we show that two distant sites can be tunnel-coupled directly. The coupling is mediated by virtual occupation of an intermediate site, with a strength that is controlled via the energy detuning of this site. It permits a single charge to oscillate coherently between the outer sites of a triple dot array without passing through the middle, as demonstrated through the observation of Landau-Zener-Stückelberg interference. The long-distance coupling significantly improves the prospects of fault-tolerant quantum computation using quantum dot arrays, and opens up new avenues for performing quantum simulations in nanoscale devices.

Premediation and the Virtual Occupation of Wall Street

Premediation and the Virtual Occupation of Wall Street

A new general method to compute virtual channels occupancy probabilities in wormhole networks

Virtual channels have been proposed to develop deadlock free routing algorithms and to overcome the performance degradation due to chains of blocked messages in wormhole switched networks. Hence, capturing the effect of virtual channels has always been an important issue in developing analytical performance models for these interconnection networks. Almost all previous models relayed on a method proposed by Dally to compute the probability of the number of busy virtual channels per physical channel. Dally's method is based on a Markov chain and after extensive investigation our results reveal that its accuracy degrades as traffic increases. In this study we propose and validate a new general method to compute this probability. The new general method is based on an M/G/1 queue and it exhibits a good degree of accuracy at different traffic conditions. We further showed that Dally's method can be deduced as a special case of the general method. Predictions from both, Dally's method and the new general method are validated against results obtained from an event-driven simulator that mimics the behaviour of wormhole-switch networks.

On the performance of circuit‐switched networks in the presence of correlated traffic

AbstractMany studies have revealed that the traffic generated by multimedia applications exhibits a high degree of burstiness and possesses strong correlation in the number of message arrivals between adjacent time intervals, which can significantly affect network performance. This paper proposes a new analytical performance model for circuit‐switched k‐ary n‐cubes with correlated traffic pattern. Compared to the models presented in the previous studies, this model is more realistic due to its ability to capture the effects of using virtual channels at a source node by taking into account the splitting of correlated traffic. Moreover, a closed‐form expression for computing the probability of virtual channel occupancy is given. The validity of the present model is demonstrated by comparing analytical results against those obtained through simulation experiments of the actual system. Copyright © 2004 John Wiley & Sons, Ltd.

Communication Delay in Wormhole-Switched Tori Networks under Bursty Workloads

Workloads generated by the real-world parallel applications that are executed on a multicomputer have a strong effect on the performance of its interconnection network—the hardware fabric supporting communication among individual processors. Existing multicomputer networks have been primarily designed and analysed under the assumption that the workload follows the non-bursty Poisson arrival process. As a step towards obtaining a clear understanding of network performance under various workloads, this paper presents a new analytical model for computing message latency in wormhole switched torus networks in the presence of bursty traffic, based on the well-known Markov-Modulated Poisson Process (MMPP). In order to derive the model, the approach for accurately capturing the properties of the composite MMPPs is applied to characterize traffic on network channels. Moreover, a general method has been proposed for calculating the probability of virtual channel occupancy when the traffic on network channels follows a multi-state MMPP process. Simulation experiments reveal that the model exhibits a good degree of accuracy.

Improving the performance of active buffer management with per-flow information

This letter proposes a new technique to improve the performance of active queue management (AQM) with per-flow information such as balanced random early detection (BRED). The technique is virtual buffer occupancy, which represents not the actual buffer occupancy but the buffer occupancy as it would be if packets were serviced in a fair round robin fashion. In AQM using virtual buffer occupancy, packets of flow i are dropped based on the virtual buffer occupancy of flow i. We show that BRED using virtual buffer occupancy achieves fairer bandwidth allocation than original BRED.

Manchurian Echoes in Chinese Nationalism

W HAT has become of the Chinese Nationalist movement since the establishment of Manchukuo? In I927-28, under the leadership of Chiang Kai-shek, the Nationalists were marching triumphantly from success to success. With the seizure of Peking in the summer of I928, it was hoped that the old military regime, inherited from the days of Yuan Shih-kai, was doomed. With the setting up of the new capital at Nanking, equally dramatic victories followed in the international field. The policy of revolutionary diplomacy adopted by the Nationalist Government was making rapid progress towards elimination of the special privileges enjoyed by foreigners, under the so-called unequal treaties, since I843. Even in far-off Mukden the seemingly irresistible strength of the movement had made itself felt. By the beginning of I929, Chang Hsiieh-liang had raised the nationalist flag in the four Manchurian provinces. United to an extent not before exceeded under the republic, China appeared to be on the point of taking its proper place as a sovereign nation. Then came the Mukden incident of September I8, I93I, speedily followed by virtual occupation of the whole of Manchuria by Japanese armies. The culmination of this development came last March in the enthronment of P'u Yi as emperor of the new state of Manchukuo. Nationalist China had lost a more populous and richer portion of the old Empire than had any previous regime. Have the Chinese knuckled under to Japanese domination? Will they presently be forced into recognition of Manchukuo? Have they passively accepted the political facade erected by Japanese bayonets? What were the causes of the failure of the Nationalist movement, which could not maintain the semblance of national unity in face of a foreign foe? These are some of the questions exercising the