Abstract
Most of the traditional simulation software of soil water, soil and crops are based on the C-paw S model, and the efficiency of the simulation and calculation is relatively underground, and ...the organization and management of the data is slightly inferior, most of them are more powerful on the model. From the point of view of the early organization and management of the data, the simulation and optimization of the medium-term data, the visualization of the late platform and the efficiency of calculation, this project completes a new simulation platform with the help of the classical WHCNS model. At the same time, the innovation is to simulate and optimize the data with the help of big data technology, multi-thread technology, Web technology and the classical WHCNS soil-crop management model, so that the system has become an important experimental means of pilot-scale experiment, which can solve the problems of long experimental period, high cost and regional differences in the pilot-scale experiment of soil organic reconstruction. The simulation platform of the pilot test is constructed, and the relevant mechanism models and research models involved in the experimental research are coupled and integrated into the platform system to form a simulation process of data input-model simulation-calculation output and visual display. Used to assist the pilot test.
With the rapid development of internationalization and urban construction, the urban linguistic landscape has become an area of great interest. The purpose of this paper is to explore the data ...analysis method of urban visual linguistic landscape based on line-of-sight orientation and to optimize the design of urban linguistic landscape based on an improved genetic algorithm. The basic visual analysis unit and the viewable area analysis unit of the linguistic landscape are proposed to quantify the visual characteristic indexes and the optimal view distance of the linguistic landscape. At the same time, the viewable spatial point set analysis unit is used to obtain the view accessibility of the language landscape. Finally, the linguistic landscape optimization model was evaluated and analyzed for application effects. The results show that through the optimized design of 10 linguistic spots in H City National Forest Park, the average score of each spot evaluation is 3.48, and the full score ratio is 63.18%. The urban language landscape optimization model proposed in this paper can effectively improve the aesthetics and visual sensitivity of the urban language landscape.
The economic amino-modified covalent triazine frameworks with good porosity and stability for meeting the gold adsorption requirements have been designed and synthesized for gold recovery from waste ...electronic and electric equipment.
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•The amino-functionalized covalent triazine frameworks (NH2-CTFs) were prepared for gold recovery from waste electronic and electric equipment.•NH2-CTFs with high porosity and good thermal stability exhibit excellent gold recovery performance.•The gold ions can be in situ reduced into gold nanoparticles by NH2-CTFs and the purity of recovered gold is up to 23.4 karat.•NH2-CTF-1 possesses high gold uptake capacity and outstanding gold recovery profit.
Recycling gold from e-waste is not only conducive to alleviating the pressure on resources and environment, but also has high economic value. Therefore, construction of adsorbents with high capacity and selectivity and low cost is significative for gold recovery from waste electronic and electric equipment (WEEE). Herein, amino-functionalized covalent triazine frameworks (NH2-CTFs) were synthesized by ionothermal conditions. NH2-CTF-1 and NH2-CTF-2 with high porosity and good thermal stability exhibit excellent gold recovery performance. Meanwhile, gold ions can be in situ reduced into gold nanoparticles by NH2-CTFs along with the adsorption process. Furthermore, NH2-CTF-1 and NH2-CTF-2 present good gold adsorption selectivity from WEEE. Notably, NH2-CTF-1 possesses high gold adsorption capacity (909 mg g−1) and outstanding recovery profit. These excellent performances confirm the potential of NH2-CTF-1 and NH2-CTF-2 for gold recovery from WEEE.
Photosensitization associated with electron/energy transfer represents the central science of natural photosynthesis. Herein, we proposed a protocol to dramatically improve the sensitizing ability of ...metal–organic frameworks (MOFs) by switching their excited state distribution from 3MLCT (metal‐to‐ligand charge transfer) to 3IL (intraligand). The hierarchical organization of 3IL MOFs and Co/Cu catalysts facilitates electron transfer for efficient photocatalytic H2 evolution with a yield of 26 844.6 μmol g−1 and CO2 photoreduction with a record HCOOH yield of 4807.6 μmol g−1 among all the MOF photocatalysts. Systematic investigations demonstrate that strong visible‐light‐absorption, long‐lived excited state and ingenious multi‐component synergy in the 3IL MOFs can facilitate both interface and intra‐framework electron transfer to boost photocatalysis. This work opens up an avenue to boost solar‐energy conversion by engineering sensitizing centers at a molecular level.
A new protocol was proposed to switch the excited state from metal‐to‐ligand charge transfer to 3IL (intraligand) for dramatically improving the sensitizing ability of metal–organic frameworks (MOFs). Hierarchical integration of single‐site catalysts into 3IL MOFs can directionally and rapidly steer electron transfer, leading to an extremely high H2 evolution activity and a record HCOOH yield among all the MOF photocatalysts.
The 3D covalent organic frameworks (COFs) have attracted considerable attention owing to their unique structural characteristics. However, most of 3D COFs have interpenetration phenomena, which will ...result in decreased surface area and porosities, and thus limited their applications in molecular/gas capture. Developing 3D COFs with non‐fold interpenetration is challenging but significant because of the existence of non‐covalent interactions between the adjacent nets. Herein, a new 3D COF (BMTA‐TFPM‐COF) with dia topology and non‐fold interpenetration for Au ion capture is first demonstrated. The constructed COF exhibits a high Brunauer–Emmett–Teller surface area of 1924 m2 g−1, with the pore volume of 1.85 cm3 g−1. The high surface area and abundant cavities as well as the abundant exposed CN linkages due to the non‐interpenetration enable to absorb Au3+ with high capacity (570.18 mg g−1), selectivity (99.5%), and efficiency (68.3% adsorption of maximum capacity in 5 min). This work provides a new strategy to design 3D COFs for ion capture.
A new non‐interpenetrated 3D covalent organic framework (COF) is first constructed for Au ions capture. The COF has high surface areas, good crystallinity, and adopts the dia topology with non‐fold interpenetration. By virtue of these features, the COF enable to trap the Au3+ with high efficiency.
Versatile electrocatalysis at higher current densities for natural seawater splitting to produce hydrogen demands active and robust catalysts to overcome the severe chloride corrosion, competing ...chlorine evolution, and catalyst poisoning. Hereto, the core‐shell‐structured heterostructures composed of amorphous NiFe hydroxide layer capped Ni3S2 nanopyramids which are directly grown on nickel foam skeleton (NiS@LDH/NF) are rationally prepared to regulate cooperatively electronic structure and mass transport for boosting oxygen evolution reaction (OER) performance at larger current densities. The prepared NiS@LDH/NF delivers the anodic current density of 1000 mA cm−2 at the overpotential of 341 mV in 1.0 m KOH seawater. The feasible surface reconstruction of Ni3S2‐FeNi LDH interfaces improves the chemical stability and corrosion resistance, ensuring the robust electrocatalytic activity in seawater electrolytes for continuous and stable oxygen evolution without any hypochlorite production. Meanwhile, the designed Ni3S2 nanopyramids coated with FeNi2P layer (NiS@FeNiP/NF) still exhibit the improved hydrogen evolution reaction (HER) activity in 1.0 m KOH seawater. Furthermore, the NiS@FeNiP/NF||NiS@LDH/NF pair requires cell voltage of 1.636 V to attain 100 mA cm−2 with a 100% Faradaic efficiency, exhibiting tremendous potential for hydrogen production from seawater.
Herein, core‐shell structured Ni3S2‐FeNi layer double hydroxides (LDH) heterointerfaces are rationally prepared. Abundant hydroxide/sulfide interfaces boost alkaline water oxidation. Impressively, electrochemical results indicate that the in situ formed sulfate layer in LDH shell largely enhances the corrosion resistance of the catalysts in the alkaline salty‐water electrolytes.
Porous organic polymer films (PFs) with intrinsical porosity and tuneable pore environment are ideally suited for application in electronic devices. However, the huge challenges still exist for ...construction of electronic devices based on PFs owing to lack of robustness, processability, and controllable preparation. Herein, we report the electrochemical preparation of carbazole‐based porous organic polymer films (eCPFs) as switchable materials for the memristors. These eCPFs possess the characteristics of controllable thickness/size, high stability, and excellent porosity. Carbazole and cyano groups are introduced into the eCPFs to constructing electron transfer systems. Thus, the memristors constructed based on these eCPFs exhibit excellent switching performance, reliability, and reproducibility. The electrochemically controllable preparation method of porous organic polymer membranes proposed in this paper provides a feasible idea for the developments of electronic devices.
The electrochemical preparation of porous organic polymer films for high‐performance memristors is presented. This work will stimulate the development of porous organic polymer films in the field of advanced electron devices.
Photosensitization associated with light absorption and energy/electron‐transfer represents the central processes for photosynthesis. However, it's still a challenge to develop a heavy‐atom‐free ...(HAF) strategy to improve the sensitizing ability of polymeric photosensitizers. Herein, we propose a new protocol to significantly improve the photosensitization by decorating mother conjugated microporous polymer (CMP‐1) with polycyclic aromatic hydrocarbons (PAHs), resulting in a series of CMPs (CMP‐2–4). Systematic study reveals that covalent modification with PAHs can transfer charge to Bodipy in CMP to further facilitate both intersystem crossing and electron‐hole separation, which can dramatically boost energy‐/electron‐transfer reactions. Remarkably, CMP‐2 as a representative CMP can efficiently drive the photosynthesis of methyl phenyl sulfoxide with 92 % yield, substantially higher than that of CMP‐1 (32 %). Experiments and theory calculations demonstrate the structure‐property‐activity relationship of these CMPs, opening a new horizon for developing HAF heterogeneous photosensitizers with highly efficient sensitizing activity by rational structure regulation at a molecular level.
A proof‐of‐concept strategy to trigger charge transfer for improving photosensitization is the covalent modification of conjugated microporous polymers (CMPs) with polycyclic aromatic hydrocarbons (PAHs). Charge transfer from the PAH donor to the Bodipy acceptor in CMPs can facilitate both intersystem crossing and electron–hole separation, leading to excellent performance for both energy‐ and electron‐transfer reactions.
General Road Detection From a Single Image Hui Kong; Audibert, Jean-Yves; Ponce, Jean
IEEE transactions on image processing,
08/2010, Letnik:
19, Številka:
8
Journal Article
Recenzirano
Given a single image of an arbitrary road, that may not be well-paved, or have clearly delineated edges, or some a priori known color or texture distribution, is it possible for a computer to find ...this road? This paper addresses this question by decomposing the road detection process into two steps: the estimation of the vanishing point associated with the main (straight) part of the road, followed by the segmentation of the corresponding road area based upon the detected vanishing point. The main technical contributions of the proposed approach are a novel adaptive soft voting scheme based upon a local voting region using high-confidence voters, whose texture orientations are computed using Gabor filters, and a new vanishing-point-constrained edge detection technique for detecting road boundaries. The proposed method has been implemented, and experiments with 1003 general road images demonstrate that it is effective at detecting road regions in challenging conditions.
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