大同采场覆岩面接触块体可动性判定研究

为研究面接触块体结构,运用矢量分析法判别了大同采场上覆岩层常见的3种面接触块体的可动性,缩小了找关键块体的范围,对面接触块体结构的深入研究奠定了基础。     

促进畜牧业高质量发展的技术与实现路径

畜牧业是农业经济的重要组成部分。2020年数据显示,我国肉类人均占有量超过世界平均水平,但低于欧美发达国家,禽蛋人均占有量达到发达国家水平,肉蛋奶的供应关乎百姓“菜篮子”安全。但畜牧业仍存在着相关产业体系发展质量效益不高、产品质量和安全性问题仍然存在、资源和环境约束日趋严峻、支持保障体系不健全、抵御风险能力偏弱等突出问题。畜禽产业是我国农业经济的重要支柱产业,实施畜禽产业转型升级创新工程,将有利于引领我国畜禽产业转型,适应畜禽养殖新形势和推动供给侧改革,对满足人民不断提高的优质动物蛋白产品需求、对美好生活的向往具有重大而深远的战略意义。本文就畜牧业相关问题和促进其高质量发展的技术与实现路径做一探讨。     

利用TCAD方法优化设计金属栅CMOS工艺及电路

为了降低集成电路制造工艺的成本,用计算机辅助工艺设计(TCAD)的方法开发了金属铝栅CMOS工艺.首先利用3μm金属铝栅工艺对模拟软件TSUPREM-4和器件模拟软件MED ICI进行了校准,再对金属铝栅1.5μm短沟道CMOS工艺进行器件结构、工艺和电气性能等参数的模拟,以最简约工艺在现有工艺线上成功流水了1.5μm铝栅CMOS.实际测试阈值电压为±0.6V,击穿达到11V,各项指标参数的模拟与实际测试误差在5%以内,并将工艺开发和电路设计结合起来,用电路的性能验证了工艺.利用TCAD方法已成为集成电路和分立器件设计和制造的重要方法.     

考虑消费者风险偏好和随机底价的“消费者出价”营销模式

考虑消费者风险偏好特征,提出一种新型随机底价的“消费者出价”营销模式(random-name-your-own-price,RN).在消赍者估值异质假设下,运用数学建模、参数分析和数值模拟的方法,讨论单一垄断和同质化竞争两种情形下零售商的策略选择问题.结果表明,单一垄断情形下,消费者对出价失败风险的厌恶会促使其在RN模...     

Sisko流变模型的钻井水力计算方法与分析评价

Sisko流变模式能够准确地描述钻井液流变性,基于广义流性指数给出了该模式水力计算模型。根据RabinowitshMooney方程给出了其管流流量方程,同时基于槽流模型给出了其同心环空流量表达式。根据管流特性参数,引入Reed与Pilehvari定义的管流有效管径,将其扩展应用到环空,定义了适用于该流体的新环空广义流性指数及有效管径。通过有效管径将Sisko流体管内、环空流动与牛顿流体管流流动相关联。通过理论推导给出了广义雷诺数表达式,该式不以广义流性指数是常数为前提,进而给出了流态判别模型,建立了统一的压耗计算模型,得到了适用于该模型的水力计算方法。通过与多组已公开发表的实验数据对比,运用该方法计算的压耗与实测数据吻合很好;说明运用此模型能够很好地预测非牛顿流体管内及环空流动压耗。     

河北坝上安固里淖风-水两相纹层的发现

安固里淖是河北坝上最大的内陆封闭湖泊,它位于张家口市张北县境内,地理坐标41°18'41°24'N,114°20'114°27'E.湖面海拔1312m左右,东南岸有季节性河流汇入,无泄水口.     

Fine mapping of the rice bacterial blight resistance gene Xa-4 and its co-segregation marker

An F₂ population developed from theXa-4 near isogenic lines, IR24 and IRBB4, was used for fine mapping of the rice bacterial blight resistance gene,Xa-4. Some restriction fragment length polymorphism (RFLP) markers on the high-density map constructed by Harushima et al. and the amplified DNA fragments homologous to the conserved domains of plant disease resistance (R) genes were used to construct the genetic linkage map around the geneXa-4 by scoring susceptible individuals in the population.Xa-4 was mapped between the RFLP marker G181 and the polymerase chain reaction (PCR) marker M55. The R gene homologous fragment marker RS13 was found co-segregating withXa-4 by analyzing all the plants in the population. This result opened an approach to map-based cloning of this gene, and marker RS13 can be applied to molecular marker-assisted selection ofXa-4 in rice breeding programs.     

Phenotypic analysis of the medullary-type CD4−CD8+ thymocytes in mice

Phenotypic analysis of the medullary-type CD4 CD8⁺ (CD8SP) thymocytes has revealed phenotypic heterogeneity within this cell population. The phenotype of mature peripheral CDS⁺T cells is TCRαβ⁺CD3⁺Qa-2⁺HSA 3G11⁻6C10, whereas in the medullary-type CD8SP thymocytes, 20% are Qa-2⁺; 33%, HAS; 30%, 3G11; and 70% are 6C10. The disparate expression patterns of these four cell surface markers suggest that medullary-type CD8SP thymocytes may undergo phenotypic maturation process. According to the distribution of these four cell surface markers, six subgroups of CD8SP thymocytes have been identified. The precursor-progeny relationship along with developmental pathway is postulated as follows: 6C10⁺HSA⁺3G11 Qa-2→ 6C10⁺HSA⁺ 3G11⁺Qa-2 → 6C10 HSA⁺3G11⁺Qa-2 → 6C10⁻HSA⁻3G11⁺Qa-2 → 6C10⁻HSA⁻3G11 Qa-2 → 6C10⁻HA S 3G11 Qa-2⁺, the cells in the last subgroup exit the thymus and home into periphery.     

PF18-3, a 35-ku molecule, expresses specifically on apoptotic subset of mouse thymocytes

PF18-3 monoclonal antibody (mAb), one of the rat mAbs against mouse thymic stromal cells (MTSC), has been found to inhibit thymocyte apoptosis induced by a mouse thymic dendritic cell line, MTSC4, in previous co-culture study. The aim of this research is to investigate the character of PF18-3 rnAb recognized molecule (PF18-3 molecule) and its role in MTSC4-induced thymocyte apoptosis. The characterization of PF18-3 molecule expression has been conducted by FACS analysis. PF18-3 molecules have been found to express on MTSC4 as well as on Con A activated but not freshly isolated thyrnocytes. Up-regulated expression of PF18-3 molecules has been also observed on thymocytes after being co-cultured with MTSC4 for 48 h. The results from FACS analyses by PI staining for detecting apoptosis-related hypodiploid and by PF18-3 rnAb staining reveal that PF18-3 molecules expresss specifically on the apoptotic subgroup of thymocytes with high hypodiploid content. The PF18-3 molecule expressed on apoptotic thymocytes with 35 ku of molecular weight, identified by immunoprecipitation and western blotting, is thus likely to be a molecule involved in thymocyte apoptosis.     

暖通空调系统故障诊断的故障向量空间法

为了能有效诊断暖通空调系统（ＨＶＡＣ）中可能出现的故障,保证暖通空调系统安全、节能地运行,提出了一种应用于暖通空调系统故障诊断的新方法——故障向量空间法（ＦＤＳＭ）。ＦＤＳＭ 的基本思想是通过观察一组反映系统或设备结构特性的特征值的变化来进行故障诊断。该方法于１９９５ 年１０ 月在英国牛津接受了国际能源局第２５ 子课题（ｆａｕｌｔｄｅｔｅｃｔｉｏｎ ａｎｄ ｄｉａｇｎｏｓｉｓ ｉｎ ＨＶＡＣｓｙｓｔｅｍ ）主持的竞赛性检验,证明了这种方法的有效性和可靠性。这种方法的提出对ＨＶＡＣ系统的正常运行和节约系统能耗有较大的意义。