Charmonium States in QCD-Inspired Quark Potential Model Using Gaussian Expansion Method

We investigate the mass spectrum and electromagnetic processes of charmonium system with the nonperturbative treatment for the spin-dependent potentials, comparing the pure scalar and scalar-vector mixing linear confining potentials. It is revealed that the scalar-vector mixing confinement would be important for reproducing the mass spectrum and decay widths, and therein the vector component is predicted to be around 22?%. With the state wave functions obtained via the full-potential Hamiltonian, the long-standing discrepancy in M1 radiative transitions of J/ψ and ψ′ are alleviated. This work also provides an inspection and suggestion for the possible cc? states among the copious higher charmonium-like states. Particularly, the newly observed X(4160) and X(4350) are found in the charmonium family mass spectrum as M(2¹ D ₂)?= 4164.9 MeV and M(3³ P ₂)?= 4352.4 MeV, which strongly favor the J ^PC ?=?2^?+, 2⁺⁺ assignments respectively. The corresponding radiative transitions, leptonic and two-photon decay widths have been also predicted theoretically for the further experimental search.     

基于5-羟甲基间苯二甲酸和咪唑衍生物的半导体型Ni-MOFs的合成、晶体结构和光催化性质

利用水热反应制备了2个配合物{[Ni （HIPA）（2,5-DPBI）_1.5（H₂O）]·2.25H₂O}_n （1）和[Ni （HIPA）（2,5-DPBMI）（H₂O）]_n （2）（H₂HIPA=5-（羟甲基）间苯二甲酸,2,5-DPBI=1,1''-（2,5-二甲基-1,4-亚苯基）双（1H-咪唑）,2,5-DPBMI=1,1''-（2,5-二甲基-1,4-亚苯基）双（4-甲基-1H-咪唑））。结构分析揭示在不同咪唑配体存在下,配合物的Ni（Ⅱ）中心具有不同的配位环境。配合物1具有拓扑符号为（4².6⁶.8²）的五连接三维框架,而配合物2则是dia型的四连接网络。粉末X射线衍射证实配合物1和2在有机溶剂和紫外可见光照射的水中均非常稳定。此外,紫外可见吸收谱、Mott-Schottky和电化学阻抗谱（EIS）测试显示配合物1和2都是典型的n型半导体材料,具有较低的电荷传输阻抗。在光催化实验中,配合物1和2对染料亚甲基蓝的降解有催化活性。     

一次消解-原子吸收光谱法连续测定蒸馏酒中金属元素

以HNO3与盐酸消解酒样品,原子吸收光谱法连续测定酒样中微量金属元素Cu、Zn、Fe、Mn、Pb、Cd的含量。方法线性好,灵敏度高,检出限低,干扰小,样品加标回收率为93.5%—103.6%,相对标准偏差小于5.0%,结果令人满意。方法简便、快速,准确度和灵敏度均满足实验要求,在企业中间产品检验中能快速提供监测结果。     

一类奇异共振椭圆方程正解的唯一性

本文研究了一类奇异椭圆方程的共振问题.利用变分方法,获得了该问题正解的唯一性,推广了Pino~([3])的结果.     

A flexible piezoelectric-triboelectric hybrid nanogenerator in one structure with dual doping enhancement effects

For achieving more effective mechanical energy conversion, based on low-cost and flexible polydimethylsiloxane (PDMS) and polyvinylidene fluoride (PVDF) polymer film as triboelectric and piezoelectric function layer respectively, a polymer-based hybrid piezoelectric-triboelectric nanogenerator (PT-NG) with a structure of Al/PVDF/Cu-PDMS/indium tin oxide (ITO)/polyethylene terephthalate (PET) has been demonstrated. The device has realized the simultaneous triboelectric and piezoelectric conversions in one structure. In addition, when PDMS and PVDF are further modified by graphene quantum dot (GQD) and titanium dioxide (TiO₂) nanoparticles respectively, both triboelectric and piezoelectric outputs of the modified device are greatly enhanced synchronously. The experimental results have indicated that the increase of triboelectric output is due to the improvement of dielectric properties of PDMS film doped with conductive GQDs as well as the enhancement of the effective contact caused by the change of PDMS surface microstructure. While the promotion of piezoelectric output is mainly attributed to the fact that PVDF film after TiO₂ modification induces more polarized β phase with a polarization-free process. Accordingly, the modified device converts mechanical energy into electricity more effectively, which shows a promising prospect in the fields of flexibility display, electronic skin, wearable electronic products and self-powered sensors.     

乳酸类合成子构建的四连接螺旋手性配位聚合物的合成、结构和光催化性质

通过乳酸衍生物和3-溴-4-羟基苯甲酸的组合得到对映体3-溴-4-(((1R)-1-羧基乙基)氧基)苯甲酸(R-H₂bba)和3-溴-4-(((1S)-1-羧基乙基)氧基)苯甲酸(S-H₂bba)。以其为手性合成子在水热条件下分别与1,3-二(吡啶-4-基)丙烷(1,3-dpp)和Ni²⁺反应,构建了对映手性配位聚合物{[Ni(R-bba)(1,3-dpp)(H₂O)_0.5]·1.5H₂O}_n (HU12-R)和{[Ni(S-bba)(1,3-dpp)(H₂O)_0.5]·1.5H₂O}_n (HU12-S)。结构分析揭示HU12-R和HU12-S是具有dia网络特征的三维螺旋骨架。在骨架中,阴离子配体R-bba^2-和S-bba^2-分别与Ni²⁺中心连接在一起围绕2₁螺旋轴得到一对小的对映螺旋链,而1,3-dpp与Ni²⁺中心则围绕4₁螺旋轴构建出另外一对大的对映螺旋链。电化学测试显示HU12-R属n型半导体,具有低阻抗性质,对紫外可见光有很强的吸收能力。进一步光催化实验证实在紫外光照射下所得配合物对染料降解有明显催化效果。     

基于乳酸衍生物的螺旋手性配位聚合物的合成与荧光性质

在水热条件下,半刚性的乳酸衍生物(R)-(1-羧基乙氧基)苯甲酸[(R)-H₂CBA]和(S)-(1-羧基乙氧基)苯甲酸[(S)-H₂CBA]分别与辅助配体1,1'-(2,5-二甲基-1,4-亚苯基)双(1H-咪唑), 1,4-PBM和Zn(Ⅱ)反应,合成了一对包含螺旋链的三维超分子手性配位聚合物[Zn₂((R)-CBA)₂(1,4-PBM)₂]_n(1-D,CCDC:2010329)和[Zn₂((S)-CBA)₂ (1,4-PBM)₂]_n(1-L, CCDC:2010330),其结构和性能经IR, XRD, TGA和FL表征。结果表明：1-D结晶于单斜的P2₁手性空间群,晶胞参数a=8.9753(5)Å, b=18.2446(8)Å, c=15.1201(12)Å,β=90.935(6)°,V=2475.7(3)ų, Dc=1.373g·cm^-3, Z=2, Flack parameter=0.022(6); 作为对映体,1-L也结晶于单斜的P2₁手性空间群,晶胞参数a=9.0090(6)Å, b=18.2280(8)Å, c=15.1227(10)Å,β=90.935(6)°, V=2483.1(3) ų, Dc=1.369 g·cm^-3, Z=2,Flack parameter=0.060(7)。 1-D和1-L的初始分解温度为317℃;1-D在440 nm处有强发射峰。      

四元硫属化合物 La2CuBiS5 的合成、结构及光学性能研究

通过高温固相反应合成了首例镧系-过渡金属-铋-四元硫属化合物:La2CuBiS5。该化合物属于正交晶系,空间群:Pnma。其结构含有沿b方向的一维[BiCuS56-]∞带,带与带之间被La3+离子隔开。一维[BiCuS56-]∞带由[CuS4]四面体双链与BiS6八面体单链通过公顶点连接而成。漫反射光谱研究表明该化合物为半导体,能隙1.30 eV。理论研究表明其为直接半导体,光学能隙跃迁来源于S3p到La5d轨道的电子迁移。     

压力及高压增氧对La2-xSmxCuO4结构及输运性质的影响

 对常压、高压、高压增氧条件下合成的La_2-xSm_xCuO₄（0≤x≤2.0）结构进行了研究。常压合成样品清晰地反应出样品由T→T+T′→T′相的变化，其中，T相：0相似文献   

普鲁士蓝和苝四甲酸二酐衍生物膜修饰的过氧化氢生物传感器

以玻碳电极(GCE)为基底,采用恒电位法沉积一层普鲁士蓝(PB),然后将苝四甲酸二酐衍生物(PTC-NH2)自组装到其表面,形成既带氨基功能团,又可有效防止PB渗漏的导电膜.通过静电吸附和共价键合作用固定纳米金和辣根过氧化物酶(HRP)的复合物,从而制得性能优良的过氧化氢(H2O2)生物传感器.采用循环伏安法(CV)和计时电流法,考察了传感器的电化学性能.实验表明,本传感器具有灵敏度高、线性范围宽、检出限低、稳定性好、抗干扰能力强等特点.其线性范围为2.0×10-6～1.4×10-3mol/L;检出限为8.3×10-7mol/L(S/N=3).