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91.
Meng Zhang Miaoqiang Lyu Jung-Ho Yun Mahir Noori Xiaojing Zhou Nathan A. Cooling Qiong Wang Hua Yu Paul C. Dastoor Lianzhou Wang 《Nano Research》2016,9(6):1570-1577
A new type of lead-free, formamidinium (FA)-based halide perovskites, FASnI2Br, are investigated as light-harvesting materials for low-temperature processed p–i–n heterojunction solar cells with different configurations. The FASnI2Br perovskite, with a band-gap of 1.68 eV, exhibits optimal photovoltaic performance after low-temperature annealing at 75 °C. By using C60 as electron-transport layer, the device yields a hysteresis-less power conversion efficiency of 1.72%. The possible use of an inorganic MoO x film as a new type of independent hole-transport layer for the present tin-based perovskite solar cells is also demonstrated. 相似文献
92.
E. NoohiAuthor Vitae H. Moradi Author VitaeN. Noori Author Vitae M. Nili Ahmadabadi Author Vitae 《Robotics and Autonomous Systems》2011,59(1):44-55
This paper addresses the planning problem of object manipulation using wheeled-tip robots considering the wheel-object contact positioning error. The term wheeled-tip refers to a new mechanism that incorporates active wheels at robot’s fingertips and allows the grasp contact-point to move along the object’s surface. The benefits of unlimited rolling contact is achieved at the cost of contact positioning error that may cause the manipulation to fail. We propose a probabilistic based algorithm for robot motion planning that in addition to being collision free, guarantees the stability of the grasp throughout the planned path. To do so, first we introduce an algorithm that ensures the kinematical stability of the grasp during manipulation by respecting the force closure constraint. Further we extend the algorithm to address the practical uncertainties involved in the position of wheel-object contact points. The proposed algorithms can be employed for manipulators with limited rolling contacts, as well. The algorithms have been tested and the results prove that the planned path can be trusted in uncertain situations. 相似文献
93.
The analysis of the experimental peel test data for obtaining the adhesion fracture energy of an adhesively laminated polymer to the sheet metal surface is considered. The experimental results of the 180° peel test on two types of polymer laminated sheet metal at three different peel speeds are analyzed by two methodological approaches in cohesive zone modeling. These approaches are linear-elastic stiffness approach and critical maximum stress approach. Comparing the results of these two approaches reveals the significance of the peel test speed on the interface strength determination for cohesive zone modeling. It is concluded that a “reference” peel speed may exist at which the interface strength is equal to the yield strength of the peel arm material. A constitutive equation has been proposed which relates the interface strength to the peel test velocity by using the reference peel speed and its corresponding peel arm yield strength. 相似文献
94.
Hosein Molavi Ali Hakkaki-Fard Mehdi Molavi Ramin K. Rahmani Anahita Ayasoufi Sahar Noori 《International Journal of Heat and Mass Transfer》2011,54(5-6):1030-1038
Ablative materials can sustain very high temperatures in which surface thermochemical processes are significant enough to cause surface recession. Existence of moving boundary over a wide range of temperatures, temperature-dependent thermophysical properties of ablators, and no prior knowledge about the location of the moving surface augment the difficulty for predicting the exposed heat flux at the receding surface of ablators. In this paper, the conjugate gradient method is proposed to estimate the unknown surface recession and time-varying net surface heat flux for these kinds of problems. The first order Tikhonov regularization is employed to stabilize the inverse solution. Considering the complicated phenomena that are taking place, it is shown via simulated experiment that unknown quantities can be obtained with reasonable accuracy using this method despite existing noises in the measurement data. 相似文献
95.
The thermal comfort in urban canyons of a high density city is a very challenging issue for urban planners and designers,
especially in hot humid tropical zone. The present study aims to evaluate the effects of a newly promulgated building construction
rules in respect of thermal climate for Dhaka, Bangladesh, a region characterized by high density area with tropical climate.
Three different urban canyons from three areas were considered which almost represents the whole city. Measurements were carried
out to assess the existing thermal climate in the city canyons. Further, three model canyons were configured according to
the new rules of ground coverage, floor area ratio (FAR) and site setback. A three-dimensional numerical model with high spatial
and temporal resolution was used to investigate the microclimatic changes within the urban environments. Model calculations
were run for a typical summer day. The thermal climate was evaluated based on air temperature T
a, surface temperature T
s, relative humidity RH, and wind speed in the existing and model canyons. For thermal comfort assessment the temperature humidity
index (THI) was considered in this study. The results showed that the outdoor spaces of the study areas are thermally uncomfortable
and the new building construction rules hardly improve the conditions in general. However, THI decreases in a canyon where
sky view factor (SVF) decreases in the model canyon than the existing one. In addition, the surface temperature T
s and air temperature T
a do not show the same picture. Furthermore, the wind speed increases in all the model canyons as the site setback allows wind
flow uniformly inside the canyons. 相似文献
96.
Saeed Yaghoubi Siamak Noori Fatemeh Pourdadashi-Komachali 《The International Journal of Advanced Manufacturing Technology》2012,61(1-4):351-368
In this paper, two multi-objective models to optimally control the lead time in multi-server multi-stage assembly system by considering server allocation problem (SAP) and also service rate control problem (SCP) are presented, where new product orders, including all their operations, are entered to the system according to a Poisson process, only one type of products also is produced by the production system, and multi-servers can be settled in each service station. Each operation of any work is operated at a devoted service station with only one of the servers located at a node of the network based on a first-come-first-serve discipline, while the processing times are independent random variables with exponential distributions. Furthermore, it is also assumed that the transport times between each pair of service stations are independent random variable with generalized Erlang distributions. Such system can be modeled as a queueing network, where the system is in the steady state and the lead time is controllable. For modeling of multi-server multi-stage assembly system, initially the network of queues is transformed into an appropriate stochastic network with exponentially distributed arc lengths. A differential equations system is organized to solve and obtain approximate lead time distribution for any particular wok by applying a proper finite-state continuous-time Markov model. Then, two multi-objective models including four conflicted objectives are presented to optimally control the servers allocated to the service stations in SAP and also service rate of service stations in SCP. For solving a discrete-time approximation of the primary multi-objective problems, the goal attainment technique is employed. In this research, reactive controlling in a multi-server multi-stage assembly system also is discussed. 相似文献
97.
FuTao Ni Jian Zhang Mohammad N. Noori 《Computer-Aided Civil and Infrastructure Engineering》2020,35(7):685-700
As intelligent sensing and sensor network systems have made progress and low‐cost online structural health monitoring has become possible and widely implemented, large quantities of highly heterogeneous data can be acquired during the monitoring. This has resulted in exceeding the capacity of traditional data analytics techniques, especially in monitoring large‐scale or critical civil structures. In particular, data storage has become a big challenge, hence, resulting in the emergence of data compression and reconstruction as a new area in structural health monitoring (SHM) of large infrastructure systems. SHM data generally include anomalies that can disturb structural analysis and assessment. The fundamental reasons for the abnormality of data are extremely complex. Therefore, reconstruction of the abnormal data is generally difficult and poses serious challenges to achieve high‐accuracy after data has been compressed. Considering these significant challenges, in this paper, a novel deep‐learning‐enabled data compression and reconstruction framework is proposed that can be divided into two phases: (a) a one‐dimensional Convolutional Neural Network (CNN) that extracts features directly from the input signals is designed to detect abnormal data with validated high accuracy; (b) a new SHM data compression and reconstruction method based on Autoencoder structure is further developed, which can recover the data with high‐accuracy under such a low compression ratio. To validate the proposed approach, acceleration data from the SHM system of a long‐span bridge in China are employed. In the abnormal data detection phase, the results show that the proposed method can detect anomaly with high accuracy. Subsequently, smaller reconstruction errors can be achieved even by using only 10% compression ratio for the normal data. 相似文献
98.
G.D. Bhowmick Md.T. Noori Indrasis Das B. Neethu M.M. Ghangrekar A. Mitra 《International Journal of Hydrogen Energy》2018,43(15):7501-7510
Bismuth impregnation on pure TiO2 (BiTiO2) was carried out and tested in microbial fuel cell (MFC) as photocathode catalyst. UV–Visible spectral observation confirmed higher catalytic activity of BiTiO2 under visible light irradiation with reduced band gap of 2.80 eV as compared to pure TiO2 (3.26 eV). Electrochemical impedance spectroscopy also showed two times higher exchange current density with lower charge transfer resistance for BiTiO2 (1.90 Ω) than pure TiO2 (3.95 Ω), thus confirming it as superior oxygen reduction reaction catalyst. MFC operated with BiTiO2 could generate a maximum power density of 224 mW m?2, which was higher than MFC with Pt as cathode catalyst (194 mW m?2) and much higher than MFCs with TiO2 catalyzed cathode (68 mW m?2) and without any cathode catalyst (60 mW m?2). The results thus promote Bi doped TiO2 as a superior low-cost alternative to the costly Pt catalyst to take this MFC technology forward for field application. 相似文献
99.
For more complex products that require customers to undertake learning in order to retrieve or realize the products’ true values, the product design and supply management decisions are different from those of less complex products. Nonetheless, in spite of the undeniable significance of coordinating decisions across product design and supply chain structures, we know very little about how to do so in practical ways. In this paper, we build on previous findings and offer a framework to enable the application of the supply chain structure design early in the new product introduction process. The proposed framework is based on a field study of the common practices in one of the major North American automakers, but we believe that it is widely applicable in other industries. 相似文献
100.
Behrooz Makki Mona Noori Hosseini Seyyed Ali Seyyedsalehi Nasser Sadati 《Neural computing & applications》2010,19(3):437-444
During the past years, various principal component analysis algorithms have been developed. In this paper, a new approach for local nonlinear principal component analysis is proposed which is applied to capture voice conversion (VC). A new structure of autoassociative neural network is designed which not only performs data partitioning but also extracts nonlinear principal components of the clusters. Performance of the proposed method is evaluated by means of two experiments that illustrate its efficiency; at first, performance of the network is described by means of an artificial dataset and then, the developed method is applied to perform VC. 相似文献