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1.
基于Visual Basic的Winsock编程 总被引:1,自引:0,他引:1
刘建平 《浙江工程学院学报》1999,16(3):225-232
介绍了利用Windows Socket实现了TCP和UDP网络服务的原理及在Visual Basic环境下如何使用Winsock控件编制基于TCP和UDP协议的客户/服务器应用程序的方法。 相似文献
2.
刘建平 《浙江理工大学学报》1999,(3)
介绍了利用Windows Socket 实现TCP和UDP网络服务的原理及在Visual Basic 环境下如何使用Winsock 控件编制基于TCP和UDP协议的客户/ 服务器应用程序的方法。 相似文献
3.
1 THEUSINGOFTHEMODELOFTHESTRUC TURALSENSITIVITYThehypothesisaboutthepossibilityofappearanceintheobjectofdiagnosis (OD)onlyofsingledefectsmakespossibledecreasethevolumeofdiagnosticinformationbeenusedinfaultdetection .ThesingledefectofODisthechangeofitste… 相似文献
4.
MicrostructureandSlidingWearPropertyofLaserCladTiN-ReinforcedCompositeCoating¥(雷廷权)(欧阳家虎)(裴宇韬)T.C.LeiJ.H.OuyangY.T.Pei(Dept.o... 相似文献
5.
《中南工业大学学报(英文版)》2001,(3)
CentralSouthUniversity (CSU)isoneofChina′skeyuniversities ,whichisaffiliatedwiththeMin istryofEducation .“JournalofCentralSouthUniversityofTechnology (EnglishEdition)” (ISSN10 0 5 9784 ,CODENJCSTFT ,Quarterly)issupportedbyCSU .Prof.ChenGuoda ,AcademicianofChineseAca… 相似文献
6.
《中南工业大学学报(英文版)》2003,(1)
CentralSouthUniversity (CSU)isoneofChina′skeyuniversities ,whichisaffiliatedwiththeMi nistryofEducation .“JournalofCentralSouthUniversityofTechnology (EnglishEdition)” (ISSN 10 0 5 9784 ,CODENJCSTFT ,Quarterly)issponsoredbyCSU .Prof.ChenGuoda ,AcademicianofChineseAca… 相似文献
7.
《中南工业大学学报(英文版)》2000,(1)
CentralSouthUniversityofTechnology (CSUT)isoneofChina′skeyuniversities,whichisaffiliat edwiththeMinistryofEducation .“JournalofCentralSouthUniversityofTechnology (EnglishEdi tion)” (ISSN 10 0 5 9784,CODENJCSTFT)supportedbyCSUT ,willbeQuarterlyfromtheyearof2 0 0 0 .Pro… 相似文献
8.
0 INTRODUCTIONMonitoringofmachiningprocess ,suchasmoni toringchatterandtoolwearinmilling ,isclassicprob lembasedonsignalprocessing .Signals (suchasvi bration ,forceandacousticemission)collectedbythesensorsaretypicallyaffectedbytheprocessdefects ,processworki… 相似文献
9.
0 INTRODUCTIONROTGDisanewtypeoflessteethdifferenceplane tarygeardrive .Itsfeaturesincludesmallvolume ,com pactstructure ,highloadcapacity ,hightransmissioneffi ciency .Therefore ,itisexpectedtobewidelyappliedinengineeringfields .However,designmethodofROTGDisc… 相似文献
10.
ADiscussionontheLocalizationofThreeDimensionalObjectBasedonMonocularVisionSystemDAIYafeiWEILing戴亚非,魏玲(ComputerCenter.Harbinln... 相似文献
11.
Potential control flotation of galena in strong alkaline media 总被引:5,自引:4,他引:5
The electrochemical oxidation of galena in collectorless and collector flotation systems, particularly in strong alkaline media, was studied. The results show that, with pH value higher than 12.5 and potentials below 0.17 V, the oxidation products of galena are elemental sulfur and HPbO2^- . Elemental sulfur was present on the mineral surface in excess of oxidized lead species due to dissolution of HPbO2^- , which is beneficial to the flotation of galena. Under the same conditions, sphalerite and pyrite were depressed as a result of significant surface oxidation. Diethyldithioearbamate (DDTC) was found to be the most suitable collector for galena flotation in strongly alkaline media. The very potential produced hydrophobic PbD2-the surface reaction produet of DDTC with galena, is 0 to 0.2 V. Meantime DDTC can depress the surface over-oxidation of galena.Investigations also indicate that, in the range of - 0.9 V to 0.6 V, hydrophobic PbD2 can be firmly adsorbed on galena. 相似文献
12.
1 INTRODUCTIONEssentially , determination of electrode reac-tion mechanism is just the determination of thecourse of electrode reaction and the rate-determi-ning step[1 5]. Based on the previous results[6 11],gold dissolution mechanism undergoes the follow-ing courses in alkaline thiourea solution: adsorp-tion of thiourea on active points of electrode sur-face and formation of Au[SC(NH2)2]ads; chargetransfer fromactive gold atomto thiourea moleculeand formation of Au[SC(NH2)2]a+ds; Au-… 相似文献
13.
PAN-based graphite felt (PGF) treated in 98% sulphuric acid for 5 h and then kept at 450 ℃ for 2 h was evaluated for their electrochemical performance as electrodes of vanadium redox battery (VRB). Structure and characteristic of treated PAN-based graphite felt (TPGF) were determined by means of Fourier Transform Infrared Spectroscopy, Scanning Electron Microscopy, Brunauer-Emmett-Teller surface area analysis and VRB test system. The results show that the acid and heat synergistic effect increase the number of —COOH functional groups on the PGF surface, and the PGF is eroded by sulphuric acid oxidation, resulting in the surface area increases from 0.31 m2/g to 0.45 m2/g. The V(Ⅱ)/V(Ⅲ) redox reaction is electrochemically reversible on the TPGF electrode, while the V(Ⅳ)/V(Ⅴ) couple is a quasi reversible process. The diffusion coefficients of the oxidation for V(Ⅳ)/V(Ⅴ) obtained from the scope of peak current Ip vs scan rate v1/2 is 4.4×10-5 cm2/s. The improvement of electrochemical activity for the electrode is mainly ascribed to the increase of the number of —COOH groups on the TPGF, which behaves as active sites catalyzing the vanadium species reactions and accelerating electron transfer reaction and oxygen transfer. 相似文献
14.
An improved ethylene blue method for determination of sulfide is developed. It has been adapted to a direct determination of sulfide by both common spectrophotometric method and total differential spectrophotometric method. In common spectrophotometric method, the calibration curve is A=1.69ρ+0.006 and the correlation coefficient is 0.9994.The apparent molar absorptivity is 5.42×104 L*mol-1*cm-1 and calibration curve is liner when ρ is in the range of 0-0.9 mg*L-1. In total differential spectrophotometric method, the calibration curve is A=9.25ρ+0.004 and the correlation coefficient is 0.9996. The apparent molar absorptivity is 2.96×105 L*mol-1*cm-1and calibration curve is liner when ρ is in the range of 0-0.10 mg*L-1. The sensitivity of this method is increased significantly compared with the former ethylene blue method. The speed of reaction is also faster than the former one. The limit of detection is found to be 1.0 ng*mL-1 by both common spectrophotometric method and total differential spectrophotometric method. Ten replicate analyses of a sample solution containing 100 ng*mL-1sulfide give a relative standard deviation of 1.8%. The effects of various cations and anions on the determination of sulfide are studied and procedures for removal of interference is described. The method is used for the determination of sulfide in environment samples with satisfactory results. 相似文献
15.
The cathodic deposition properties and mechanism of Zn in alkaline zincate solution were studied by electrochemical techniques. The results show that Zn2 exists in the alkaline solution in the form of Zn(OH)42-. The apparent activation energy of the electrode reaction is 38.93 kJ/mol, which indicates that the discharge of Zn(OH)42- on cathode is controlled by electrochemical polarization, and accompanied by a preceding chemical reaction. The diffusion coefficient of Zn(OH)42- is 2.452×10-6 cm2/s. Zn(OH)2 is the species directly discharged on the cathode surface. Based on the above results the mechanism of zinc electroplating in alkaline zincate solution was put forward. The discharged species is Zn(OH)2 formed from the preceding chemical reaction, which becomes Zn(OH)ad when gaining one electron, and then gaining the second electron to become Zn. The first electron gaining step is rate determining one. 相似文献
16.
High temperature plastic deformation behavior of non-orientated electrical steel was investigated by Gleeble 1500 thermo-mechanical
simulator at strain rate of 0.01−10 s−1 and high temperature of 500–1 200 °C. The stress level factor (a), stress exponent (n), structural factor (A) and activation energy (Q) of high temperature plastic deformation process of non-orientated electrical steel in different temperature ranges were
calculated by the Arrhenius model. The results show that, with dynamic elevation of deformation temperature, phase transformation
from α-Fe to γ-Fe takes place simultaneously during plastic deformation, dynamic recovery and dynamic recrystallization process, leading
to an irregular change of the steady flow stress. For high temperature plastic deformation between 500 and 800°C, the calculated
values of a, n, A, and Q are 0.039 0 MPa−1, 7.93, 1.9×1018 s−1, and 334.8 kJ/mol, respectively, and for high temperature plastic deformation between 1 050 and 1 200 °C, the calculated
values of a, n, A, and Q are 0.125 8 MPa−1, 5.29, 1.0×1028 s−1, and 769.9 kJ/mol, respectively.
Foundation item: Project(2005038560) supported by the Postdoctoral Foundation of China; Project(05GK1002-2) supported by Key Program of Hunan
Province 相似文献
17.
The AAAc(1 : 1) was synthesized in water by As2O3 and Sb2O3 with molar ratio of 1 : 1. AAAc(1 : 1) was characterized by Raman, IR, TG/DTG, DSC, XPS and XRD. The results show that there
are four peaks to v
s of As-OH, As-O-Sb, Sb-OH and Sb-O-Sb in Raman spectra of AAAc(1 : 1) at 100 – 1 000 cm−1. The solution of AAAc(1 : 1) was also titrated with KOH solution. The titration results show that AAAc(1 : 1) is a hexabasic
acid with dissociation constants of k
1=3.62 × 10−2, k
2=3.05 × 10−3, k
3=6.43 × 10−6, k
4 =9.78 × 10−8, k
5=1.32 × 10−11, k
6=3.87 × 10−12. AAAc(1 : 1) has a good solubility and stability in water, its solid obtained by free volatilizing water from its solution
under air at ambient temperature is amorphous. Chemical and thermal analysis show that the composition of AAAc(1 : 1) is As2O5 · Sb2O5 · 8H2O in air at 25 °C. AAAc(1 : 1) has the structure of AsO(OH)2-OH-Sb(OH)4-O-Sb(OH)4-OH-AsO(OH)2 or As(OH)3-O-Sb(OH)4-O-Sb(OH)4-O-As(OH)3 (isomerism) through experimental determination and geometry optimization.
Foundation item: Project(50274075) supported by the National Natural Science Foundation of China 相似文献
18.
Constitutivemodelisamathematicalrepresentationofthedeformationresponseofamaterialtoexternallyap pliedloading ,includingenvironmentalfactors .Thepre ciseknowledgeoftheconstitutivebehaviorofthematerialisthefoundationofnumericalsimulationtechnologyofmateri… 相似文献
19.
Oxide semiconductor alloys of x(LiGaO2)1/2-(1−x)ZnO were fabricated by the solid state reaction between β-LiGaO2 and ZnO and rf-magnetron sputtering. For the solid state reaction, the wurtzite-type single phases were obtained in the composition
range of x⩽0.38. The formation range of the alloys was wider than that of the (Mg1−x
Zn
x
)O system, because the β-LiGaO2 possesses a wurtzite-derived structure and approximately the same lattice constants with ZnO. The electrical resistivity
and energy band gap of the 0.38(LiGaO2)1/2-0.62ZnO alloyed ceramic were 0.45 Ωcm and 3.7 eV, respectively, at room temperature. For the alloying by sputtering, the
films consisting of the wurtzite-type single phase were obtained over the entire composition range of x(LiGaO2)1/2-(1−x)ZnO. The energy band gap was controllable in the range from 3.3 to 5.6 eV. For the as-deposited film fabricated using the
0.4(LiGaO2)1/2-0.6ZnO alloyed ceramic target, the energy band gap was 3.74 eV, and the electrical resistivity, carrier density and the Hall
mobility at room temperature were 3.6 Ωcm, 3.4×1017 cm−3 and 5.6 cm2 V−1 s−1, respectively. 相似文献
20.
The sensitive second derivative waves of Cu(Ⅱ),Pb(Ⅱ),Cd(Ⅱ),Ni(Ⅱ),Zn(Ⅱ),Fe(Ⅱ)and Mn(Ⅱ),forming in the substrate solution(pH=9.26)consisting of ammonia,ammonium chlorid,gelatin and ascorbic acid were researched.The peak potentials of the polarographic waves of the seven ions are at about 0.48,0.63,0.79,1.04,1.28,1.44 and 1.60 V respectively.Combining with microwave technique,a new method for the simultaneous determination of the seven trace elements in Chinese traditional medicine was developed.The method is easy to operate,rapid,simple and convenient.When the signal-to-noise rate equals 3,the detection limits of Cu,Pb,Cd,Ni,Zn,Fe and Mn are 4.2×10 3,5.3×10 3,2.1×10 3,5.8×10 4,3.0×10 3,7.7×10 4 and 1.1×10 3 μg/mL respectively.Well linear relationships exist between the concentrations and the peak currents when Cu,Pb,Cd,Ni,Zn,Fe and Mn concentrations are within 8.5×10 3 10,9.7×10 3 10,4.5×10 3 10,1.2×10 3 10,6.4×10 3 10,1.5×10 3 10 and 2.8×10 3 10 μg/mL,respectively.The method has been used to the simultaneous determination of the seven trace elements in Salvia Miltiorrhiza Root and compound Salvia Miltiorrhiza Root injection,the relative standard deviations(RSDs)of the Cu,Pb,Cd,Ni,Zn,Fe and Mn in the two medicines are 3.9% and 5.8%,4.0% and 4.1%,4.3% and 5.7%,4.9% and 5.3%,4.4% and 4.7%,3.5% and 4.0%,0.51% and 2.8%,respectively;the comparisons of the determination results with the values obtained by the standard method indicate that the presented method has very well veracity. 相似文献