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Aerial refueling scheduling of multi-receiver and multi-tanker under spatial-temporal constraints for forest firefighting

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Chinese Journal of Aeronautics 2024年第5期37卷 71-91,I0001页

作者： Jing huang Jiaqi XING Jinrui REN quan quan Youmin ZHANG Department of Information and Control Engineering Xi’an University of TechnologyXi’an 710048China Jiujiang Measuring Test Technology Research Institute Jiujiang 332000China School of Automation Science and Electrical Engineering Beihang UniversityBeijing 100191China School of Automation Xi’an University of Posts&TelecommunicationsShaanxiXi’an 710121China Department of Mechanical Industrial and Aerospace EngineeringConcordia UniversityMontreal H3G 1M8Canada

Forest fires pose a significant threat to human life and property,so the utilization of unmanned aircraft systems provides new ways for forest *** the constrained load capacities of these aircraft,aerial refueling becomes crucial to extend their operational time and *** order to address the complexities of firefighting missions involving multi-receiver and multi-tanker deployed from various airports,first,a fuel consumption calculation model for aerial refueling scheduling is established based on the receiver ***,two distinct methods,including an integrated one and a decomposed one,are designed to address the challenges of establishing refueling airspace and allocating tasks for *** methods aim to optimize total fuel consumption of the receivers and tankers within the aerial refueling scheduling *** optimization problem is established as nonlinear optimization models along with *** integrated method seamlessly combines refueling rendezvous point scheduling and tanker task allocation into unified *** has a complete solution space and excels in optimizing total fuel *** decomposed method,through the separation of rendezvous point scheduling and task allocation,achieves a reduced computational ***,this comes at the cost of sacrificing optimality by excluding specific feasible ***,numerical simulations are carried out to verify the feasibility and effectiveness of the proposed *** simulations yield insights crucial for the practical engineering application of both the integrated and decomposed methods in real-world *** comprehensive approach aims to enhance the efficiency of forest firefighting operations,mitigating the risks posed by forest fires to human life and property.

关键词： Aerial refueling Scheduling Planning Spatial-temporal constraint Firefighting

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Synthesis and crystal structure of an ionic cluster {[Mo_3(μ_3-O)(μ-S)_3(dtp)_3(py)_3][CdI(dtp)_2]}

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Chinese Journal of Chemistry 1997年第4期15卷 296-303页

作者： LU,Shao-Fang huang,jian-quan huang,Xiao-Ying WU,Qiang-JinState Key Laboratory of Structural Chemistry,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou,Fujian 350002,China State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China [?]Invited professor at Fuzhou University.

A new cluster compound {[Mo3(μ3-O)(μ-S)3(dtp)3(py)3][CdI(dtp)2]} (dtp=S2P(O-was obtained from the reaction of (Mo3OS3(dtp)4(H2O)] with a CdI2-Bu4NI *** molecular structure is composed of a cluster cation [Mo3OS3(dtp)3(py)3]+ and the complex anion [CdI(dtp)2]-Crystal data:Triclinic,space group P1 with cell parameters a=1.4672(7),b=1.5356(5),c=1.6806(5) nm,α=74.59(3),β=67.89(4),7=78.86(3)°,V=3.364(2) nm3,and Z=2,least-squares refinement of 8941 reflections gives a final agreement factor of R=0.052,Rw=0.065.

关键词： Molybdenum cadmium cluster synthesis crystal structure

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Studies on reactivities of molybdenum clusters——The additive reaction of SbCl3 to trimolybdenum clusters with loose coordination sites and the crystal structure of the reaction product

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Chinese Journal of Chemistry 1987年第3期5卷 199-209页

作者： LU Shao-Fang* huang jian-quan LIN Yu-Hui huang Jin-Ling, Fujian Institute of Research on the Structure of Matter, Academia Sinica, Fuzhou Fujian Institute of Research on the Structure of Matter Academia Sinica Fuzhou

The additive reaction of SbCl3to trimolybdenum clusters with loose coordination sites,Mo3（μ3-S）(μ-S)3[S2P （OEt）2]4·L′（1L′=H2O; 2, L′=C3H3ON）, in a C2H5OH-HCl medium yieldscomplexes {Mo3（μs-S） [（μ-S）3·SbCl3] [S2P （OEt）2]4·（C2H6OH）}（C2H5OH）（3） and {Mo3（μ3-S） [（μ-S）3·SbCl3] [S2P （OEt）2]3[SXP （OEt）2] · （C3H3ON）} （X=S,O）（4）, respectively. The crystal and mo-lecular structures of these two compounds have been determined by single crystal X-ray crystallography:crystal 3 belongs to the monoclinic system, P21,/n, while crystal 4 belongs to the trielinic system, P1,The intensity data were collected on an Enraf-Nonius CAD-4 diffractometer with graphite-monochro-matized MoKα radiation by using the ω-2θ technique. The structures were solved by the Pattersonmethod as well as direct methods and refined by full matrix least-squares method. Final R values were0.078 for crystal 3 and 0.068 for crystal 4, respectively. The result of the structure determination showedthat the two molecular structures are practically formed by connecting a trimolybdenum clusterswith loose coordination sites,{Mo3（μs-S）（μ-S）3[S2P（OEt）2]4·L （L=C2H5OH, C3H3ON）, with a SbCI3molecule through three （μ-S）atoms to form the {Mo3SbS4} core of a cubane-like type. There arerelatively weak coordination bonds between the Sb and the three （μ-S） atoms, while no bonding in-teraction between the Sb and the three Mo atoms is found. In the additive compounds the structuralcharacter of the trimolybdenum clusters with loose coordination sites has significantly been *** addition, 3 still has the reactivity for the loosely coordinated EtOH to be replaced by an oxazole ringto form crystal 4. However, the three （μ-S） atoms may be regarded as triple bridging S atoms eachconnecting two Mo atoms and a Sb atom. The information obtained serves as an evidence that thetetranuclear clusters might be formed by a [3+1] reaction mode.

关键词： Sb In Studies on reactivities of molybdenum clusters The additive reaction of SbCl3 to trimolybdenum clusters with loose coordination sites and the crystal structure of the reaction product

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A novel method for extracting and optimizing the complex permittivity of paper-based composites based on an artificial neural network model

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Science China Technological Sciences 2024年第10期67卷 3190-3204页

作者： XIA ChenBin SHEN JunYi LIAO ShaoWei WANG Yi huang ZhengSheng XUE quan TANG Min LONG Jin HU jian School of Light Industry and Engineering South China University of Technology School of Electronic and Information Engineering South China University of Technology

Measuring the complex permittivity of ultrathin, flexible materials with a high loss tangent poses a substantial challenge with precision using conventional methods, and verifying the accuracy of test results remains difficult. In this study, we introduce a methodology based on a back-propagation artificial neural network(ANN) to extract the complex permittivity of paper-based composites(PBCs). PBCs are ultrathin and flexible materials exhibiting considerable complex permittivity and dielectric loss tangent. Given the absence of mature measurement methods for PBCs and a lack of sufficient data for ANN training, a mapping relationship is initially established between the complex permittivity of honeycomb-structured microwave-absorbing materials(HMAMs, composed of PBCs) and that of PBCs using simulated data. Leveraging the ANN model, the complex permittivity of PBCs can be extracted from that of HMAMs obtained using standard measurement. Subsequently, two published methods are cited to illustrate the accuracy and advancement of the results obtained using the proposed approach. Additionally, specific error analysis is conducted, attributing discrepancies to the conductivity of PBCs, the homogenization of HMAMs, and differences between the simulation model and actual objects. Finally, the proposed method is applied to optimize the cell length parameters of HMAMs for enhanced absorption performance. The conclusion discusses further improvements and areas for extended research.

关键词： paper-based composite honeycomb complex permittivity artificial neural networks inverse modeling

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THE SYNTHESIS AND CRYSTAL STRUCTURE OF Mo3（μ3-O）-（μ-S）3（μ-OOCCH3）(dtp)3（Py）

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Chinese Journal of Structural Chemistry 1992年第2期 127-129页

作者： Wang Zhe-Min Zhang Bin huang Weng huang jian-quan huang Jin-LingDepartment of Chemistry, Fuzhou University, Fuzhou, Fujian, 350002

The title compound was obtained by the reaction of Mo3(μ3-O) (μ-S)3(dtp)4(H2O) with CH3COONa and pyridine. Mo3C19H38N1O9P3S9,Mr= 1093. 79, triclinic, space group P1, a = 12. 921(3) , b = 14. 260(3) , c= 12. 800(3)(?),α = 97. 54(2), β=116. 66(1), γ=100. 10(2) °, V = 2015, 2(8)(?)3, Z=2, Dc = 1. 80gcm-3, F(000) = 1092, final R = 0. 066 for 3444 observations, room temp. In the structure the three Mo atoms form an isosceles triangle capped by a μ3-O atom with three sides of 2. 589(2) , 2. 642(2), and 2. 627(2) (?) respectively, and the car-boxyl bridged Mo-Mo bond is the shortest one.

关键词： Mo dtp OOCCH3 Py

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Research on in part "loosely" coordinated trinuclear molybdenum cluster compounds—— the synthesis and crystal structure of {Mo3（μ3-S）(μ-S)3[S2P（OEt）2]4·P（C6H5）3} （0.86CH2Cl2）

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Chinese Journal of Chemistry 1986年第4期4卷 301-310页

作者： huang jian-quan LU Shao-Fang LIN Yu-Hui huang Jin-Ling LU Jia-Xi Fujian Institute of Research on the Structure of Matter, Academia Sinica, Fuzhou Fujian Institute of Research on the Structure of Matter Academia Sinica Fuzhou

The synthesis and crystal structure of novel trinuclear molybdenum cluster compoundwith somewha "loose" coordination site {Mo3（μ3-S）(μ-S)3[S2P（OEt）2]4· P（C6H5）3}'·（0.86 CH2Cl2）have been reported. The cluster crystallizes in the spece group Pl with two molecules in a unit cellwhose parameters are a=10.472（4）, b=14.375（2）, c=21.695（3）; a=74.O4（1）°, β=76.50（2）°, γ=72.22（2）°, v=2950 and D_o=1.693 ***-x. On the basis of 4840 independent reflections with I≥2σ（1）.the structure was solved by heavy atom method and Fourier method and refined by full-matrixleast-squares techniques to a final R=0.058. The distances between Mo atoms in this cluster are 2.731（1）, 2.748（1） and 2.753（1） *** mean value of Mo--Mo bond lengths is slighly shorter than those in other trinuclear Mo clusterswith "looscly coordinated" site. In addition, the PPh3ligand is loosely coordinated to one Mo atomin direction opposite to the μ3-S with Mo--P bond length of 2.647（3）. This is different from theother strocturally analogous clusters, in which the loosely coordinated ligand is trans to μ2--S. Asummary of Mo--Mo and Mo-L bonding for such clusters is given.

关键词： Mo3 the synthesis and crystal structure of OEt Research on in part S2P coordinated trinuclear molybdenum cluster compounds loosely CH Cl

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Mechanism analysis of foam penetration in EPB shield tunnelling with a focus on FER and soil particle size

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Underground Space 2024年第4期17卷 170-187页

作者： He huang quan Sun Tao Xu Wanhuan Zhou State Key Laboratory of Internet of Things for Smart City and Department of Civil and Environmental Engineering University of MacaoMacao 999078China Department of Civil and Environmental Engineering University of MacaoMacao 999078China School of Transportation Southeast UniversityNanjing 210000China

Parameters of foam penetration in earth pressure balance(EPB)shield tunnelling,such as permeability coefficients and penetration distances,significantly impact tunnel face ***,existing studies have faced inaccuracies in analysing these parameters due to imitations in experimental *** study addresses this issue by employing enhanced methods for a more precise analysis of foam *** involving three distinct sand types(coarse,medium,and fine)and three foam expansion ratios(FER)(10,15,and 20)are conducted using a modified model test *** from a novel computer vision-based method,the model test outcomes unveil two distinct foam penetration paths:liquid migration(L_(w))and bubble migration(L_(f)).Three penetration phases-namely,injection,blockage&drainage,and breakage—are identified based on L_(w)and L_(f)*** initial"injection"phase conforms to Darcy’s law and is amenable to mathematical *** foam with FER of 15 has the maximum viscosity and,hence the L_(f)and permeability in the penetration tests with FER of 15 are the lowest in the same *** bubble size distribution of foam with different FER shows minor ***,the characteristics of foam penetration vary due to the distinct particle size distribution(PSD)of different *** penetration creates low-permeability layers in both medium and fine sands due to the larger bubble size of the foam compared to the estimated pore sizes of medium and fine *** the coarse sand results in a different situation due to its large pore *** distinctive characteristics of foam penetration in different sand strata are notably shaped by FER,PSD,and pore size *** insights shed light on the complex interactions during foam penetration at the tunnel face,contributing valuable knowledge to EPB shield tunnelling practices.

关键词： EPB Soil conditioning Foam penetration Permeability Tunnel face

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Synthesis and structure of an open-type trinuclear molybdenum cluster compound[Mo_3(μ_3-S)(μ-S)_2-(μ-OAc)(S_2CNC_4H_8)_3(O)_2]·0.5CH_2Cl_2·2H_2O

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Chinese Journal of Chemistry 1992年第1期10卷 52-58页

作者： LU,Shao-Fang huang,Zi-Xiang Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhoa,Fujian 350002 huang,jian-quan ZHANG,Bin huang,Jin-Ling Department of Chemistry,Fuzhou University,Fuzhou,Fujian 350002 1Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 3500022Department of Chemistry Fuzhou University Fuzhou Fujian 350002

The title compound was prepared by the reaction of Mo_3S_4(dtp)_4(H_2O)[ctp=S_2P(OEt)_2] with NaOAc·3H_2O and C_4H_8NCS_2NH_*** data:[Mo_3(μ_3-S)(μ-S)_2(μ-OAc)- (S_2CNC_4H_8)_3(O)_2]·0.5CH_2CI_2·2H_2O,Mr=980.18,triclinic,space group P(?),α=12.360(3),b=16.653(6), c=9.206(2)A,α=101.97(2),β=108.32(2),γ=86.14(3)°.V=1759.6(9)A^3,Z=2,Dc=1.85 g/cm^3, F(000)=962,μ(Mo K_α)=16.53 cm^(-1).Final R=0.044 for 4301 reflections with I≥3σ(I).This compound may be regarded as a mixed-valent trinuclear molybdenum cluster{Mo_2(V)Mo(Ⅳ)(μ_3-S)(μ-S)_2- (μ-OAc)(S_2CNC_4H_8)_3(O)_2}.The Mo-Mo distances are 2.783(1),2.833(1)and 3.374(2)A in the Mo_3 non-equilateral triangle and there exist only two Mo-Mo *** cluster was obtained by oxi- dation and ligand substitution of{Mo_3(μ_3-S)(μ-S)_3[μ-S_2P(OEt_2)][S_2P(OEt)_2]_3(H_2O)}.

关键词： Mo S2CNC4H8 Synthesis and structure of an open-type trinuclear molybdenum cluster compound[Mo3 OAc CNC type CH Cl

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CRYSTAL STRUCTURE OF [Mo3S4 （μ-CH3COO） [S2P（OEt）2]3 （py）] （CH3COOCH2CH3）

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Chinese Journal of Structural Chemistry 1990年第2期 116-120页

作者： Lu Shao-Fang huang jian-quan huang Zi-Xiang huang Jin-Ling Lu Jia-Xi Fujian Institute of Research on the structure of Matter, Academia Sinica

[Mo3S4(μ-CH3COO)[S2P(OEt)2]3(py)]·(CH3COOCH2CH3) , Mr = 1197. 96,monoclinic,P21/n,a=13. 158(2),b=23. 153(5), c=16. 175(3) A,β = 112. 79(1)°,V=4543. 1(7)A3,Z=4, Dc= 1. 751g/cm-3,λ(MoKa) = 0. 71073A ,μ= 13. 799cm-1,F(000) = 2408. Final R=0. 067 for 4000 reflections. The structure consists of the neutral cluster molecule [Mo3S4(μ-OAc) (dtp)3(py)] (dtp = [S2P(OEt)2]) and the solvent ethyl acetate (AcOEt). The three Mo-Mo bond lengths in the title compound are 2. 691(2) ,2. 747(2) ,2. 762(2) A ,whereas the Mo-N bond length in Mo(3) position is 2. 36(2)A. The important bond lengths of these Mo clusters with (py) ring at the loose coordination site are listed for comparison.

关键词： Mo3S4 S2P CRYSTAL STRUCTURE OF OEt CH3COOCH2CH3

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Synthesis　and　Structureof［（C_2H_5）_4N］［Mo_3（μ_3－O）（μ－Cl）_3（μ－CH_3CH_2COO）_3Cl_3］

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Chinese Journal of Structural Chemistry 1996年第4期15卷 257-260页

作者： Zhuang Hong-Hui Wu Ding-Ming huang jian-quan huang Jin-Ling(State Key Laboratory of Structural Chemistry and Fujitan Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fujian 350002) State Key Lab. of Struct. Chemistry Fujian Inst. Res. Struct. of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 Fuzhou University

The title cluster compound, Mo_3Cl_6O_7NC_17H)35, has been synthesized reaction of a mixture of MoC_l3·3H_2O、(C_3H_5)_4NI and CH_3CH_2COOH. Crystallographic data: monoclinic, space group P2_1/a, a=12. 990 (2), b=19. 572 (5), c =12. 411 (3)A, β=90. 00(4)°, V=3155. 3 A￣3, Z=4, M_r=866. 01, D_c= 1. 823 g/cm￣3. μ(MoKα)=16. 934, MoKα(λ=0. 71073 A ), T= 295K , F(000)=1712, final R=0. 048 and R_w= 0. 062 for 2997 reflections with I≥3σ(I). The crystal contains discrete cations and anions. The mono-oxo-capped trinuclear Mo cluster anion consists of three Cl atoms and three CH_3CH_2COO- groups that bridge the three edges of Mo triangle,and three terminal Cl atoms. The coordination around Mo is distortedly octahedral.

关键词： Mo cluster crystal structure synthesis.

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