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1.
Rong Yin Jihui Zhang Xudong Shang 《Mathematical Methods in the Applied Sciences》2020,43(15):8736-8752
This paper is dedicated to studying the following Schrödinger–Poisson system Under some different assumptions on functions V(x), K(x), a(x) and f(u), by using the variational approach, we establish the existence of positive ground state solutions. 相似文献
2.
以ZnO,HCO_2H及4,4'-bipy(摩尔比1∶3∶1.25)溶于H_2O和DMF(体积比13∶1),并在60℃反应,合成了标题化合物[Zn(HCO_2)_2(4,4'-bipy)]_∞,对其进行了元素分析、红外光谱等表征,并测定了晶体结构.该化合物晶体属四方晶系,P4_32_12空间群,a=b=0.79675(5)nm,c=1.7627(2)nm,V=1.1190(3)nm~3,Z=4,Dc=1.850g/cm3,M_r=311.60,F(000)=632,μ=22.07cm-1,最终偏离因子R1=0.0183和wR_2=0.0483.该化合物中Zn原子和两个4,4'-bipy的N原子和四个甲酸根的O原子配位,形成的ZnN_2O_4八面体通过4,4'-bipy和甲酸根桥联,组成一种新颖的3D网络结构.同时,研究了该化合物的热性质和荧光性质. 相似文献
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挥发化合物发生-原子荧光法测定水中痕量锌 总被引:2,自引:0,他引:2
研究了挥发化合物发生-原子荧光光谱法测定环境水中痕量锌的可行性,着重优化了硼氢化钾与锌的反应条件,包括仪器和试剂条件.研究发现:适量镍离子和钴离子的存在能增强锌的荧光强度.在选定的最佳试验条件下,荧光强度与锌的质量浓度在0~1 200μg·L-1范围内呈线性关系.对标准空白进行11次测定,方法检出限为0.53μg·L-1;对400μg·L-1锌进行11次测定,其相对标准偏差(RSD)为3.0%,平行测定8份水样,RSD为3.6%;分析了4种不同水样并做加入不同浓度锌(Ⅱ)标准溶液时的回收率试验,结果在98%~104%之间. 相似文献
8.
Reaction of COC12.6H20 with equimolar bis(3,5-dimethylpyrazolyl)methane (dmpzm) produced a mononuclear adduct [Co(dmpzm)Cl2] (1). Treatment of 1 with sodium dicyanamide (dca) afforded a polymeric complex [Co(dmpzm)(μ-dca)2]∞ (2). 1 and 2 were characterized by elemental analysis, IR spectra, thermogravimetric analysis and single-crystal X-ray diffraction. The cobalt atom in 1 adopts a distorted tetrahedral coordination geometry, bound to two N atoms of one dmpzm and two Cl atoms. Complex 2 has a 2D brick-wall network (extended along the bc plane) in which the { [Co(dmpzm)(μ-dca)]2} n^2n+ chains are interconnected by pairs of μ-dca anions along the c axis. The magnetic properties of 1 and 2 were also investigated. 相似文献
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Reactions of SmI2 in THF with ArSSAr produced two binuclear samarium thiolate complexes [(THF)3I2- Sm(μ-SAr)]2 [Ar=Ph (1), 4-Me2NC6H4 (2)] in high yields. The structure of 2 was characterized by single crystal X-ray crystallography. The crystal of 2 belongs to the triclinic system with space group P 1 and a=0.95705(13) nm, b= 1.22287(14) nm, c= 1.26450(14) nm, a=64.194(11)°, B=78.491(13)°, y=76.176(12)°, V= 1.2860(3) nm^3, Z= 1,μ=4.783 mm^-1, Dc= 1.964 Mg/m^3, M= 1521.19, S= 1.046, R1=0.0358, wR2=0.0910. X-ray analysis revealed that 2 is a thiolate-bridged dimer in which each Sm atom adopts a distorted pentagonal bipyramidal coordi- nation geometry. 相似文献
10.
Results are reviewed from a study examining how structural modifications introduced by ozonization enhance the influence of kraft lignin on the crystallization of CaCO(3). Ozone treatment of kraft lignin in an aqueous environment is shown to increase its carboxylic acid and overall oxygen content and reduce its molecular weight. Calcium concentration and temperature were monitored in heated supersaturated solutions containing ozonized kraft lignins to gauge their influence on CaCO(3) crystallization processes. The presence of kraft lignin raises the temperature necessary to induce crystallization. This effect is shown to level off at relatively low lignin concentrations and be dependent on the extent of ozone treatment the kraft lignin has undergone. A linear correlation is found between crystallization temperatures and the carboxylic acid content of ozonized lignin samples indicating the introduction of these functional groups plays an important role in enhancing its inhibitory effect. Scanning electron microscopy images of crystals grown in the presence of kraft lignins show significant morphological modifications. These are consistent with specific or pseudo specific interactions between the lignin and crystal faces of calcite to inhibit growth parallel to its c axis. The influence over crystal morphology demonstrated by modified kraft lignin increases with increasing ozonization. Also presented here are crystallization temperature data for a range of kraft lignin ultrafiltration fractions, which indicate that the optimal (nominal) molecular weight of kraft lignin for inhibiting the crystallization of CaCO(3) lies between 5000 and 10000. 相似文献