远红外契伦柯夫FEL的动力学理论

契伦柯夫自由电子激光可以产生远红外相干受激辐射。本文建立了契伦柯夫自由电子激光的动力学理论并详细研究了初始信号频率,电子束电压和束—介质膜间隙对器件性能的影响。与自由电子激光,回旋自谐振脉塞比较,指出了短波契伦柯夫自由电子激光的几个显著特点。     

行列可交换不相关随机变量组列的中心极限定理之收敛速度

（ｘｉｊ）为行列可交换不相关随机变量组列,本文讨论ｓｕｐ│ｐ（ａ＾－１ｎＴｎ〈ｘ）－Φ（ｘ）│→０的速度（其中Ｔｎ＝１／ｎ２ｎΣｉ＝１ｎΣｊ＝１ｘｉｊ,Ｏ＾２ｎ＝ＶａｒＴｎ,Φ（ｘ）为标准正态分布函数）,取得了与Ｕ－统计量情形下相同的结果。     

稀土对小麦（Triticum aestivum）体内光合和呼吸速率及磷酸化功能的影响

以适当浓度稀土溶液处理小麦后，其光合和氧化磷酸化的磷氧比（Ｐ／Ｏ）、光合控制（Ｐｃ）、呼吸控制（ＲＣ）、状态３．４光合和呼吸速率（Ｓ３．Ｓ４）与对照样比均无显著性差异。状态２（Ｓ２）光合和呼吸速率提高，差异极显著。说明小麦用最适浓度稀土处理后，对其光合和呼吸的磷酸化机构和功能膜影响不大，但显著促进了光合和呼吸速率（Ｓ２），从而促进了电子传递链的活性，使ＡＴＰ形成量增加。     

离子束刻蚀技术研究

本文介绍了离子束刻蚀技术的原理,讨论了刻蚀速率与离子束流密度、离子能量和离子束入射角度的关系。实验结果与理论分析有较好的一致性。     

α—萘酚胁迫对普通小球藻生长及抗氧化酶活性的影响

研究了α－萘酚对普通小球藻的生长、光合色素的MDA含量及抗氧化酶9SOD、CAT、POD）活性的影响,结果表明,随着α－萘酚浓度的升高,藻的生长速率、叶绿素a与类胡萝卡素的含量,SOD、CAT、POD活性均先升高后下降,除POD活性在5．00mg.L^－1时达到最大值外,其余均在2．00mg.L^-1达到最大,而在α－萘酚浓度低于2．00mg.L^-1时,MDA含量变化不大,只有当3种抗氧化酶活性呈不同的下降后,MDA含量才急剧上升,膜脂过氧化加剧,说明α－萘酚导致普通小球藻膜脂过氧化是其致毒机制之一,而抗氧化酶在一定污染物浓度范围内具有防御保护作用。     

离子注入剂量与酒精酵母存活率关系研究

研究了以低能离子注入为手段,来选育斯托尔酒精酵母。在此过程中,如何确定最佳的出发菌株注入时间和限定干燥时间,对所获得的离子注入剂量与酒精酵母存活率关系曲线进行了讨论。     

基于SPSS的教职工健康体检数据分析研究——以宁波大学为例

为尽早预防疾病, 开展健康管理, 改善教职工的健康现状, 对2018—2021年期间宁波大学教职工的健康体检资料采用SPSS 23.0软件进行统计分析. 结果表明 2018—2021年检出前10种疾病略有不同, 4年间检出率均位于前10位的疾病有甲状腺结节、肺结节、血脂异常、高尿酸血症、心电图异常、乳腺异常. 其中每年血脂异常、肺结节及高尿酸血症检出率男性高于女性(P< 0.05), 甲状腺结节的检出率则是女性高于男性(P<0.05); 甲状腺结节、肺结节和高尿酸血症的检出率呈现逐年升高趋势(P<0.05); 每年检出的疾病随年龄变化的态势各不相同, 其中血脂异常、甲状腺结节、肺结节、心电图异常、前列腺异常的检出率随着年龄的增长而增加(P<0.05). 表明慢性非传染性疾病已成为影响教职工健康的首要危险因素. 因此, 应倡导科学的生活方式, 积极进行健康体检, 建立健康管理档案, 并进一步强化健康管理理念和教职工的健康意识, 尽可能改善教职工的健康状况.     

对卫星近日点旋进现象的分析——"地球的扁率对卫星运动的影响"一文的疏忽

指出了一篇相关文献中的疏漏,讨论了卫星近日点的旋进现象,得出了在一般情况下卫星近日点旋进的快慢程度与近日点本身所处的位置有关的结论.     

Evaluation of micro-bubble size and gas hold-up in two-phase gas-liquid columns via scattered light measurements

In this paper, potential use of an elliptically polarized light scattering (EPLS) method to monitor both bubble size and gas hold-up in a bubble-laden medium is explored. It is shown that with the use of the new EPLS system, normalized scattering matrix elements (M_ij's) measured at different side and back-scattering angles can be used to obtain the desired correlations between the bubble sizes and input flow parameters for a gas-liquid (GL) column, including gas flow rate and surfactant concentrations. The bubble size distributions were first evaluated experimentally using a digital image processing system for different gas flows and surfactant concentrations. These images showed that the bubbles were not necessarily spherical. We investigated the possibility of modeling the bubbles as effective spheres. The scattering matrix elements were calculated using the Lorenz-Mie theory and the results were compared against the experimentally determined values. It was observed that the change in the bubble size yields significant changes in M₁₁, M₃₃, M₄₄, and M₃₄ profiles. An optimum single measurement angle of θ=120^° was determined for a gas velocity range of 0.04-0.35 cm/s (). The choice of the optimum angle depends on frit pore size, column diameter, gas pressure, and surfactant concentration. These results suggest that a simplified version of the present EPLS system can effectively be used as a two-phase flow sensor to monitor bubble size and liquid hold-up in industrial systems.     

Equivalent cross-relaxation rate imaging positively correlates with pathological grade and cell density of adipocytic tumors

Objective

Equivalent cross-relaxation rate imaging (ECRI) is an MRI technique used to evaluate qualitative changes in protein-water interactions. We aimed to prospectively evaluate the utility of ECRI for classification of adipocytic tumors.

Materials and Methods

Institutional Review Board approval was obtained and all patients provided informed consent. Study participants included 40 patients with adipocytic tumors who were diagnosed with lipomas (n = 22), atypical lipomatous tissue/well-differentiated liposarcoma (ALT/WDL; n = 9), myxoid/round cell liposarcoma (MyL; n = 6), and dedifferentiated liposarcoma (DDL; n = 3), and 20 control patients for whom subcutaneous fat in the buttock or thigh was analyzed.

Results

Mean ECR values of lipomas, ALT/WDL, and subcutaneous fat were low, and those of MyL and DDL were high. Mean ECR values of MyL and DDL were significantly higher than those of ALT/WDL. The cut-off value was 5.1%. There was a positive correlation between ECR value, pathological grade, and cell density in adipocytic tumors.

Conclusion

The ECR value positively correlates with pathological grade and cell density of adipocytic tumors. Our findings suggest that ECRI is a useful method for preoperative evaluation of adipocytic tumors.