间接分光光度法测定药品中VC含量

利用VC的还原性,将Fe3+定量转化为Fe2+离子,产生的Fe2+与邻菲哆啉形成橘红色络合物,从而间接测定VC的含量。结果表明,络合物在510nm处有最大吸收峰,且显色物的浓度在2.0×10-6-5.0×10-5mol/L范围内与吸光度成正比,其相关系数R为0.9936,检出限为2.0×10-6mol/L,被测定样品的...     

基于C语言的TMS320DM6437 DSP中断向量表设置

针对发展迅速的DSP技术,采用C语言开发DSP芯片,不仅大大提高了DSP芯片的开发速度,也使得程序的修改和移植变得十分方便。在C64x＋系列DSP芯片中,一般采用DSP/BIOS设置硬件中断,采用高级语言C语言设置DM6437中断向量表,给出了中断向量表的设置步骤,开发结果表明,它具有可读性、可移植性,易于维护和修改的特点。     

塔城地区边境县市课程改革和双语教学调研报告

边境地州农牧区县市实施课改和推进双语教学的情况一直是自治区关注的重点。新疆维吾尔自治区教育科学研究所课改与双语教学调研组采取了城乡对比的方式,对塔城地区裕民县等三个边境县市课改与双语教学情况进行了调研,客观地指出了存在的问题,并有针对性地提出有效解决问题的对策和建议,具有普遍的指导意义。     

大学生职业行为训练仿真系统设计

结合教育游戏开发的需求,提出了基于角色扮演游戏的职业行为训练仿真系统的设计方案。系统总体结构设计采用三层式C／S体系结构,功能的实现与开发采用3D游戏引擎。系统从基本职业规范的要求出发,实现在虚拟现实环境中针对学生的职业道德、职业态度和职业形象的行为优化训练。     

远程教育程序设计类课程教学方法的改革研究——以C＋＋语言程序设计为例

C＋＋语言程序设计作为计算机应用专业的基础课,在整个专业中有着举足轻重的地位。鉴于远程教育特殊的学习方式,加之该课程的学习内容比较抽象,导致教学过程难以推进。为改变重理论、轻实践的教学现状,提升教育教学质量,本文对C＋＋语言程序设计进行教学改革研究,并取得良好效果。     

影响学生英语学习动机的教师言语亲近行为研究——对宁波某高职英语教师Jane的个案研究

在二语学习的课堂中,有效的师生沟通有助于建立更亲近的师生关系,更有效地促进学生参与学习活动。本研究旨在从教师和学生两个角度调查教师主要的言语亲近行为以及这些行为如何对高职学生英语学习动机和学习成绩产生作用。在此基础上,本文提出了教师应该如何改进自己的行为以助于提高学生英语学习动机的建议。     

浅析山西地方戏曲旅游资源的价值

地域特色文化旅游是当今旅游行业发展的新焦点,山西拥有丰富深厚的地方戏曲旅游资源,具有重要价值。对其进行合理开发利用对弘扬地方文化,拉动区域经济建设,树立地方形象品牌意义重大。     

浅析B2C服装电子商务企业如何吸引风险投资

初创期B2C服装电子商务企业高风险、高投入、高预期收益的特性使我国B2C服装电子商务企业在发展过程中时刻伴随着风险投资的身影,但如何吸引风险投资是B2C服装电子商务企业面临的一个难题。文章在分析风险投资选择项目的标准的基础上,从创业管理团队、商业模式两个方面论述了初创期B2C服装电子商务企业如何吸引风险投资。     

New physics searches at the BESIII experiment

The standard model (SM) of particle physics, comprised of the unified electroweak and quantum chromodynamic theories, accurately explains almost all experimental results related to the micro-world, and has made a number of predictions for previously unseen particles, most notably the Higgs scalar boson, that were subsequently discovered. As a result, the SM is currently universally accepted as the theory of the fundamental particles and their interactions. However, in spite of its numerous successes, the SM has a number of apparent shortcomings, including: many free parameters that must be supplied by experimental measurements; no mechanism to produce the dominance of matter over antimatter in the universe; and no explanations for gravity, the dark matter in the universe, neutrino masses, the number of particle generations, etc. Because of these shortcomings, there is considerable incentive to search for evidence for new, non-SM physics phenomena that might provide important clues about what a new, beyond the SM theory (BSM) might look like. Although the center-of-mass energies that BESIII can access are far below the energy frontier, searches for new, BSM physics are an important component of its research program. This report reviews some of the highlights from BESIII’s searches for signs of new, BSM physics by: measuring rates for processes that the SM predicts to be forbidden or very rare; searching for non-SM particles such as dark photons; performing precision tests of SM predictions; and looking for violations of the discrete symmetries C and CP in processes for which the SM expectations are immeasurably small.     

A case of vitamin B12 deficiency neurological syndrome in a young adult due to late-onset cobalamin C (CblC) deficiency: a diagnostic challenge

Vitamin B12 deficiency can present with neurologic and psychiatric symptoms without macrocytic anaemia. We describe a case of late-onset cobalamin C deficiency which typically presents with normal serum vitamin B12 concentrations, posing an additional diagnostic challenge. A 23-year-old woman with decreased muscle strength and hallucinations was diagnosed with ‘catatonic depression’ and admitted to a residential mental health facility. She was referred to our hospital for further investigation 3 months later. Heteroanamnesis revealed that the symptoms had been evolving progressively over several months. Magnetic resonance imaging (MRI) of the brain showed diffuse symmetrical white matter lesions in both hemispheres. Routine laboratory tests including vitamin B12 and folic acid were normal except for a slight normocytic, normochromic anaemia. Over the next 6 weeks her symptoms deteriorated, and she became unresponsive to stimuli. A new MRI scan showed progression of the white matter lesions. The neurologist requested plasma homocysteine (Hcys) which was more than 8 times the upper limit of normal. Further testing revealed increased methylmalonic acid and the patient was diagnosed with adult-onset cobalamin C deficiency. This case illustrates that Hcys and/or methylmalonic acid should be determined in patients presenting with neuropsychiatric symptoms suggestive of vitamin B12 deficiency with a normal serum vitamin B12 to rule out a late-onset cobalamin C deficiency.