绿色阻垢剂聚天冬氨酸的研究进展

聚天冬氨酸是一种无毒、无磷、可生物降解的绿色环保型水处理剂,具有良好的阻垢性能.在简要回顾阻垢剂的发展历史以及聚天冬氨酸合成的基础上,综述了近几年聚天冬氨酸作为阻垢剂的研究进展.主要是通过在侧链上引入具有阻垢效果的功能基团,改性后的聚天冬氨酸具有更好的阻垢性能或其他性能.对这一领域的发展方向做了展望.     

Variational quantum simulation of thermal statistical states on a superconducting quantum processer

Quantum computers promise to solve finite-temperature properties of quantum many-body systems, which is generally challenging for classical computers due to high computational complexities. Here, we report experimental preparations of Gibbs states and excited states of Heisenberg $XX$ and $XXZ$ models by using a 5-qubit programmable superconducting processor. In the experiments, we apply a hybrid quantum-classical algorithm to generate finite temperature states with classical probability models and variational quantum circuits. We reveal that the Hamiltonians can be fully diagonalized with optimized quantum circuits, which enable us to prepare excited states at arbitrary energy density. We demonstrate that the approach has a self-verifying feature and can estimate fundamental thermal observables with a small statistical error. Based on numerical results, we further show that the time complexity of our approach scales polynomially in the number of qubits, revealing its potential in solving large-scale problems.     

阻燃型含磷环氧树脂体系的研究进展

将磷导入环氧树脂体系而赋予其阻燃性能是目前热门的研究课题。本文简述了含磷阻燃剂的阻燃机理，详细讨论了含磷阻燃环氧的类型及固化物的阻燃特性，以及磷和氮、硅等元素的协同效应。     

无卤磷系阻燃聚合物研究进展

无卤磷系阻燃聚合物燃烧时低烟无毒,对环境污染少,阻燃剂含量较少就能达到好的阻燃效果,且对聚合物材料的各种性能影响甚微,因而无卤磷系阻燃聚合物得到广泛的应用。文中在参考了大量文献的基础上,对无卤磷系阻燃聚合物的合成、结构、性能及应用做了详细的介绍和论述,并展望了无卤磷系阻燃聚合物的发展方向和前景。     

基于4-甲基邻苯二甲酸和4,4'-联吡啶混合配体的镉的配合物的合成、结构及荧光性质

通过Cd(OAc)2.2H2O与4-甲基邻苯二甲酸(H2L)及4,4′-联吡啶(bpy)在水热条件下反应得到一个新型的配位聚合物{[Cd(L)(bpy)(H2O)2.2H2O]}n(1),并用元素分析,红外,热重,粉末衍射及单晶X-射线分析法对配合物的结构进行了表征。配合物首先展示二维层状的网络结构,再进一步通过丰富的氢键堆积成三维超分子结构,另外,本文还研究了该配合物的荧光性质。     

Quantum simulation and quantum computation of noisy-intermediate scale

In the past years, great progresses have been made on quantum computation and quantum simulation. Increasing the number of qubits in the quantum processors is expected to be one of the main motivations in the next years, while noises in manipulation of quantum states may still be inevitable even the precision will improve. For research in this direction, it is necessary to review the available results about noisy multiqubit quantum computation and quantum simulation. The review focuses on multiqubit state generations, quantum computational advantage, and simulating physics of quantum many-body systems. Perspectives of near term noisy intermediate-quantum processors will be discussed.     

动荷载反分析的模态选择方法

提出了动态载荷识别中新的确定模态的准则与实施方法.提出了模态选取概念,在此基础上提出了反分析中模态选取的准则,并给出了相应的公式.大量算例表明,采用该文准则和公式可以防止因模态选取不当而产生的伪解,避免计算中的数值病态,明显提高了动态载荷识别的成功率和精度.     

金属交联羧甲基羟丙基纤维素反应的研究

使用新型有机钛络合物交联羧甲基羟丙基纤维素(CMHPC),仍得凝胶具备较高的耐温性,热分析结果亦表明交联产物有良好的热稳定性。对有机钛及其它一些金属离子交联CMHPC反应的行为和红外谱图分析显示,CMHPC与金属离子作用时,不仅由羧甲基提供活性络合部位,而且羟丙基也参予反应,交联机制受取代度和反应条件的影响。     

含磷萘基环氧的制备及其固化物的热分析

含磷萘基环氧的制备及其固化物的热分析;环氧;磷;改性;热性质;阻燃