Materials Literature
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[Objective] The aim was to study the relationship between influence factors and separation effect of unginned cotton and film remnant.[Method]With the dragout ratio of unginned cotton,separate ratio of film remnant as response indicators,rotation speed of small and big mesh-roller,inlet wind speed of slop channel as i…
In this article,the GB/T 1298—2008 Carbon Tool Steel and GB/T 9943—2008 High Speed Tool Steel standards issued in 2008 are introduced and compared with earlier editions resprctively.The difference in standard name,applied range and technology are mentioned.The advantage of the two new standards are that they integrate…
Objective To optimize the preparation method of oxymatrine sustained-release microspheres.Methods The orthogonal design was used to test the influence of four main factors in preparation,including amount of chitosan,mass ratio of oxymatrine and chitosan,amount of glutaraldehyde and emulsion cross-linking time.The drug…
The performances,production cost and casting ability of Cr-ductile iron crankshaft were compared with that of crankshafts made by other materials.Through theoretical analysis,the advantage of Cr-ductile iron crankshaft was discussed.The technological problems in production of Cr-ductile iron crankshaft were solved thr…
The rotary molding press is the key facility in the compression molding working procedure of the nuclear fuel pellets.Its compression assembly called the upper compression roller frame has been worn and torn seriously during the production.At first,the paper established the mechanical model of the upper compression ro…
A graphene oxide/polyaniline naocomposites with high electroactivity was developed.Firstly,a graphene oxide/polyaniline(GO/PANI) composites was prepared by the oxidation polymerization of aniline in graphene oxide(GO) dispersions.Secondly,a reduced graphene oxide/polyaniline(R(GO/PANI)) composites was obtained by the…
Phase change memory (PCRAM) cell with asymmetric structure was prepared by nano-scale processes, such as lithography, sputtering and liftoff. Both direct and pulsed current writing (reset) properties were tested. Reversible phase change can be stably realized between amorphous and crystalline states. When the writing…
Sintered Nd-Fe-B magnets,which have excellent magnetic performance,were the key materials in permanent magnet industry.In the past two decades,Nd-Fe-B magnets have a wide application,such as,VCM [voice core motor] in hard disc drive,motors,generators,mobile phone,MRI,etc.Motor market is expected to expand in future be…
Polyimide was copolymerized via one step method using self-made 3,5-diamino-N-benzamide(DAPDM),3,3′-dimethyl-4,4′-methyl-enedianiline(DMMDA) with 4,4′-oxydi(phthalic anhydride)(ODPA).The obtained polyimide was characterized by 1H-NMR solubility,thermostability,and pretilt angle of polyimide were analysed.Results show…
An elastic-plastic FEA model is established for annular gear of the external boss and its mould,based on which a machining process for parts is analyzed as well as the key technology during cold extrusion is studied.Hence the varying rules of extruding forces,velocity,stress as well as metal fluent regulation are obta…
Objective To evaluate the feasibility,safety and biocompatibility of a novel device designed by the authors for the occlusion of left atrial appendage(LAA) in canine models.Methods The occlusion of LAA was performed in 20 experimental dogs by using a novel LAA occluder,which was delivered to the LAA through a transsep…
Niobium-containing mesoporous molecular sieves Nb-SBA-15 were synthesized by using Nb2O5 as niobium source.The molecular sieves were characterized by means of small angle XRD,BET,FT-IR,DTA.The results show that with niobium loaded on SBA-15,it possess characteristic structure of SBA-15.The(Z)-Nb-SBA-15 molecular sieve…
This paper studied the influence of pouring temperature,casting velocity and cooling intensity on the microstructural evolution of 6061 alloy during near-liquidus semicontinuous casting(LSC) to clarify the formation mechanism of the semisolid microstructure.It was analyzed the formation of spherical primary α phase in…
A study on the adsorption properties of seacell fibers for copper and zinc ions used aqueous solutions of copper chloride and zinc sulfate to treat the fibers under various treatment conditions of different times and temperatures.The adsorption capacities of the fibers for copper and zinc ions were determined after me…
A 4-week feeding trial was conducted to investigate the effects of chitooligosaccharides(0,250 mg·kg-1,500 mg·kg-1,750 mg·kg-1 and 1 000 mg·kg-1) on the growth and non-specific immunization of Litopenaeus vannamei.Results demonstrate that there is significant difference in the total number of hemocytes,growth rate and…
为了改善Mg2Ni型合金的电化学贮氢性能,用La部分替代Mg,并用铸造及快淬工艺制备了Mg2-xLaxNi（x=0、0.2、0.4、0.6）电极合金,获得长度连续,厚度约为30μm,宽度约为25mm的薄带。用XRD、SEM和HRTEM分析了快淬合金薄带的微观结构,测试了合金薄带的电化学性能、电化学交流阻抗谱（EIS）及氢在合金中的扩散系数（D）。结果发现,在快淬无La合金中没有出现非晶相,但快淬La替代合金显示了以非晶相为主的结构,表明La替代Mg提高了合金的非晶形成能力。当x≤0.2时,La替代Mg不改变合金的Mg2Ni型主相,但出现少量的LaMg3及La2Mg17相。La替代及快淬明显改善合金的电化学贮氢性能。其中,Mg2La…
In this paper the squeeze casting magnesium alloy situation of study at home and abroad was reviewed,the squeeze casting magnesium alloy research significance was examined,and magnesium alloy extrusion equipment,methods and advanced production technology was integrated and compared,the squeeze casting magnesium alloy…
Varieties and characteristics of pneumatic switch valves used in PVC production were introduced as well as the matters needing attention during their installation,disassemble and using.
Objective: To study the clinical safety significance of renal function monitoring for arterial chemotherapy.Method: Before and 14 days within arterial chemotherapy infusion,120 cases with liver cancer,lung cancer and pelvic cancer respectively,checked the urine routine,urine N-acetyl-β-D-glucose glycoside enzyme(N-ace…
Two novel conjugated polymers based on carbazole and indolocarbazole were synthesized via Suzuki coupling reaction.The resulting polymers present high molecular weights,good thermal and electrochemical properties.The photophysical properties show that the prepared polymers are potential pure blue light emitting materi…