Investigations on the Sensing Mechanism of Humidity Sensors Based on Poly(4-vinylpyridine)/carbon Black Composite by AC Impedance Spectra

1 Results Investigations on the sensing mechanism is important for understanding the electrical responses of humidity sensors to humidity change,and could provide guidelines for the design and synthesis of humidity sensitive materials with desirable properties.In this work,the sensing mechanism of humidity sensors based on quaternized poly(4-vinylpyridine) (PVP)/carbon black (CB) composite[1] was studied by measuring their AC impedance spectra at various humidities at room temperature.Under low humidity...     

CFG桩施工引起桩周土体开裂的原因探讨

由于郑东新区特殊的工程地质条件，长螺旋CFG（Cement Flyash Gravel）桩施工常常引起桩周土体开裂和周围建筑物开裂等施工事故。本文通过郑州某工地现场试验分析，否定了空桩效应引起桩周土体开裂的猜想，并分析了郑东新区由于CFG桩施工引起桩周土体开裂的原因。     

CONSTRUCTIVE KISSING NUMBERS IN HIGH-DIMENSIONAL SPACES

In the present paper, we focus on constructive spherical codes. By employing algebraic geometry codes, we give an explicit construction of spherical code sequences. By making use of the idea involved in the proof of the Gilbert-Varshamov bound in coding theory, we construct a spherical code sequence in exponential time which meets the best-known asymptotic bound by Shamsiev and Wyner.     

结合山区农村学校实际，开发校本课程资源

《基础教育课程改革纲要（试行）》指出：“为保障和促进适应不同地区、学校、学生的要求，实行国家、地方和学校三级课程管理”，“学校在执行国家和地方课程的同时，应视当地社会、经济发展的具体情况，结合本校的传统和优势，学生的兴趣和需要，开发和选用适合本校的课程”。作为国家课程和地方课程的有益补充，校本课程资源开发的意义是不言而喻的。     

哈夫曼编码应用的一种改进——范式哈夫曼编码

哈夫曼编码是一种变长编码,一种最优前缀编码技术,其实现了数据压缩,但其存在的不足直接制约了它的广泛应用。本文主要介绍一种改进方法——范式哈夫曼编码及译码算法,以解决其应用的不足。     

魏晋皇帝宗庙祭祖礼制考论

魏晋皇帝宗庙四时祭祖礼制,既有沿袭东汉相关制度之处,也有因时适宜变革、创新之处。由于受经学领域郑玄、王肃两大学派相互辩难、竞长的影响,曹魏皇帝宗庙禘、祫祭礼制最初依据郑玄学说,而后兼采郑玄、王肃学说定制。为兼顾情、礼,东晋自穆帝以后,逐渐实行每三十个月举行一次祭祀的殷祭制度。     

A non-commutative time-frequency tomography

The characterization of non-stationary signal requires joint time and frequency information. However, time and frequency are a pair of non-commuting variables that cannot constitute a joint probability density in the time-frequency plane. The time-frequency distributions have difficult interpretation problems arising from negative and complex values or spurious components. In this paper, we get time-frequency information from the marginal distributions in rotated directions in the time-frequency plane. The rigorous probability interpretation of the marginal distributions is without any ambiguities. This time-frequency transformation is similar to the computerized axial tomography (CT or CAT) and is applied to signal analysis and signal detection and reveals a lot of advantages especially in the signal detection of the low signal/noise (S/N).     

关于专业选修课教学的探索和改进——谈“信息论与编码”课程改革的设想

为了培养学生的自学能力、独立思考能力以及动手能力,针对在电子信息专业的专业选修课程《信息论与编码》教学过程中发现的问题,探讨该课程教学,提出了一些改革的思路和方法。     

两类N参数σ—域族的刻划

证明了Ｎ参数左连续强增加σ－域族的（ＯＲＴ）性质等价于（ＳＴＲ）性质，对于具有（ＰＩＶ）性质的离散Ｎ参数σ－增域族，必存在单参数σ－增域族和关于它的停时族（Ｔｚ）ｚ∈Ｎ＾Ｎ。     

跳马中学生“跑空”的心理状态及控制

“跑空”不但使自己动作变形、产生不良的心理压力,给其他学生也产生不良心理影响.本文就学生“跑空”的心理状态及控制作了一肤浅探讨。