基于室内物理模型试验和原位锚固试验,对基于高模数硅酸钾溶液-（粉煤灰＋粉土）（PS-（F＋C））浆液的木锚杆锚固系统在夯土介质中进行了拉拔测试与杆体-浆体界面应变监测,研究了该锚固系统的锚固性能与破坏模式、杆体-浆体界面剪应力...基于室内物理模型试验和原位锚固试验,对基于高模数硅酸钾溶液-（粉煤灰＋粉土）（PS-（F＋C））浆液的木锚杆锚固系统在夯土介质中进行了拉拔测试与杆体-浆体界面应变监测,研究了该锚固系统的锚固性能与破坏模式、杆体-浆体界面剪应力分布与传递特征。结果表明：该锚固系统室内试验极限锚固力（24～38 k N）远大于现场试验值（2.5～8 k N）;锚固系统具有低弹性强塑性特征,表现出极强的延性;在荷载进程中杆体-浆体界面的应力分布与传递特征具有多峰值分布、高值往往出现在锚固末端、压应力出现等特征,表明该锚固系统兼有拉力型和压力型全长黏结性锚固系统的特点;该系统适合于夯筑土遗址锚固,与遗址具有良好的物理力学兼容性。展开更多
Oxidation process of Co(C 6 H 11 O) 2 PS 2 2 and substitute-reduction reaction of Co C 6 H 11 O) 2 PS 2 3 with pyridine have been studied by spectrophotome tric methods,respectively.The equ ilibrium constant was found...Oxidation process of Co(C 6 H 11 O) 2 PS 2 2 and substitute-reduction reaction of Co C 6 H 11 O) 2 PS 2 3 with pyridine have been studied by spectrophotome tric methods,respectively.The equ ilibrium constant was found to be K=0.63±0.02(mol·dm -3 ) -3 .The crystal structure of Co 6 H 11 O) 2 PS 2 2·2Py has been determined by X-ray diff-raction method.The crystal belongs to triclinic system,space groupP1,with cell parameters:a=6.944(2)?,b=9.277(3)?,c=15.981(6)?,α=91.79(3)°,β=99.55(3)°,γ=94.44(3)°,V=1011.2(6)? 3 ,Z =2,M r =803.94,D c =1.320Mg ·m -3 ,F(000)=425,μ=0.747mm -1 ,final R=0.0700and w R=0.1988for 3626re-flections with I≥2σ(I).The cobalt atom in the title complex has a octahedral geometry with four Co-S bonds and two Co-N bonds.The central atom P is t etrahedrally surrounded by two sulp hur atoms and two oxygen atoms in the dicyclohexyldithiophosphate liga nd.The six carbon atoms of cyclohexyl take the chair conformation.展开更多
Additive reactions of Ni[(C 4H 9O) 2PS 2] 2 with ethylamine,diethylamine and triethylamine were studied by spectrophotometric methods in ethanol at several tempertures.With ethylamine,the adduct formation of NiL 2...Additive reactions of Ni[(C 4H 9O) 2PS 2] 2 with ethylamine,diethylamine and triethylamine were studied by spectrophotometric methods in ethanol at several tempertures.With ethylamine,the adduct formation of NiL 2·B and NiL 2·B 2 was established.For diethylamine and triethylamine,being of their steric hindrance effect,the formation of NiL 2·B only was concluded.Their additive equilibrium constants(lg β n)and additive molecular number(n) were discussed.Thermodynamic parameters △ r H m and △ r S m were found by the least square method.The additive equilibrium constants in the range 278 0～303 0K were described by empirical equation.展开更多
A new code concept is used for the L1 civil（L1C） signal of the global positioning system（GPS）.The generation of L1C codes is quite different from the generation of traditional ranging codes.Thus,it is necessary to...A new code concept is used for the L1 civil（L1C） signal of the global positioning system（GPS）.The generation of L1C codes is quite different from the generation of traditional ranging codes.Thus,it is necessary to find a method for the correct generation to pave the way for future research.L1C codes are based on only one Legendre sequence which consists of Legendre symbols.To calculate these Legendre symbols,the Euler criterion is always used to evaluate quadratic residues.However,due to the great length of L1C codes,this procedure causes overflow problems.Therefore,the quadratic reciprocity law,some related theorems and properties are introduced to solve the problems.Moreover,if the quadratic reciprocity law,some related theorems and properties are used to calculate different Legendre symbols,the combination modes may vary,which causes a complex generation process.The proposed generation method deals with this complex generation process effectively.In addition,through simulations,it is found that the autocorrelation features of obtained Legendre sequences and L1C codes are in accordance with theoretical results,which proves the correctness of the proposed method.展开更多
文摘基于室内物理模型试验和原位锚固试验,对基于高模数硅酸钾溶液-（粉煤灰＋粉土）（PS-（F＋C））浆液的木锚杆锚固系统在夯土介质中进行了拉拔测试与杆体-浆体界面应变监测,研究了该锚固系统的锚固性能与破坏模式、杆体-浆体界面剪应力分布与传递特征。结果表明：该锚固系统室内试验极限锚固力（24～38 k N）远大于现场试验值（2.5～8 k N）;锚固系统具有低弹性强塑性特征,表现出极强的延性;在荷载进程中杆体-浆体界面的应力分布与传递特征具有多峰值分布、高值往往出现在锚固末端、压应力出现等特征,表明该锚固系统兼有拉力型和压力型全长黏结性锚固系统的特点;该系统适合于夯筑土遗址锚固,与遗址具有良好的物理力学兼容性。
文摘Oxidation process of Co(C 6 H 11 O) 2 PS 2 2 and substitute-reduction reaction of Co C 6 H 11 O) 2 PS 2 3 with pyridine have been studied by spectrophotome tric methods,respectively.The equ ilibrium constant was found to be K=0.63±0.02(mol·dm -3 ) -3 .The crystal structure of Co 6 H 11 O) 2 PS 2 2·2Py has been determined by X-ray diff-raction method.The crystal belongs to triclinic system,space groupP1,with cell parameters:a=6.944(2)?,b=9.277(3)?,c=15.981(6)?,α=91.79(3)°,β=99.55(3)°,γ=94.44(3)°,V=1011.2(6)? 3 ,Z =2,M r =803.94,D c =1.320Mg ·m -3 ,F(000)=425,μ=0.747mm -1 ,final R=0.0700and w R=0.1988for 3626re-flections with I≥2σ(I).The cobalt atom in the title complex has a octahedral geometry with four Co-S bonds and two Co-N bonds.The central atom P is t etrahedrally surrounded by two sulp hur atoms and two oxygen atoms in the dicyclohexyldithiophosphate liga nd.The six carbon atoms of cyclohexyl take the chair conformation.
文摘Additive reactions of Ni[(C 4H 9O) 2PS 2] 2 with ethylamine,diethylamine and triethylamine were studied by spectrophotometric methods in ethanol at several tempertures.With ethylamine,the adduct formation of NiL 2·B and NiL 2·B 2 was established.For diethylamine and triethylamine,being of their steric hindrance effect,the formation of NiL 2·B only was concluded.Their additive equilibrium constants(lg β n)and additive molecular number(n) were discussed.Thermodynamic parameters △ r H m and △ r S m were found by the least square method.The additive equilibrium constants in the range 278 0～303 0K were described by empirical equation.
基金supported by the National High Technology Research and Development Program of China(863Program)(2011AA110101)the National Basic Research Program of China(973Program)(2009CB724002)
文摘A new code concept is used for the L1 civil（L1C） signal of the global positioning system（GPS）.The generation of L1C codes is quite different from the generation of traditional ranging codes.Thus,it is necessary to find a method for the correct generation to pave the way for future research.L1C codes are based on only one Legendre sequence which consists of Legendre symbols.To calculate these Legendre symbols,the Euler criterion is always used to evaluate quadratic residues.However,due to the great length of L1C codes,this procedure causes overflow problems.Therefore,the quadratic reciprocity law,some related theorems and properties are introduced to solve the problems.Moreover,if the quadratic reciprocity law,some related theorems and properties are used to calculate different Legendre symbols,the combination modes may vary,which causes a complex generation process.The proposed generation method deals with this complex generation process effectively.In addition,through simulations,it is found that the autocorrelation features of obtained Legendre sequences and L1C codes are in accordance with theoretical results,which proves the correctness of the proposed method.
