利用单片机设计的电子秤

随着单片机技术的发展，单片机在微控制领域中占据了不可代替的重要地位；本文以MUC89c52单片机为例，阐述了以单片机为控制核心，实现电子秤的基本称重功能、显示购物清单功能、设置日期功能及设定商品单价等功能。     

GATS下中国互联网过滤审查制度法律问题研究——以谷歌搜索引擎争端为视角

中国与谷歌搜索引擎争端涉及中国的互联网过滤审查制度。首先,中国相关措施适用于GATS。其次,搜索引擎服务属于Provisional CPC844"数据库服务",中国并没有对该服务部门作出承诺,因而中国并不承担市场准入及国民待遇的义务。再次,美国对中国可能的诉讼根据是GATS第3条透明度。最后,即使专家组认定搜索引擎服务属于其他中国作出具体承诺的服务部门,中国也可援引GATS第14条一般例外进行抗辩。总体而言,美国并没有强有力的理由提起WTO诉讼。     

超声波辅助提取油茶籽粕中蛋白的工艺研究

以油茶籽粕为原料,采用超声波辅助碱溶酸沉法提取油茶籽蛋白.在单因素基础上通过正交实验选出最佳的超声参数,并得出最佳提取工艺条件为：料液比1：20（g/mL）,pH10,超声温度50℃,超声功率300 W,超声时间60 min.此条件下,油茶籽蛋白提取率可达57.82％.并对本实验获得的油茶籽粗蛋白粉感官特征指标和质量指标进行评价,产品质量较好,能够满足市场要求.     

Heteroskedasticity, autocorrelation, and spatial correlation robust inference in linear panel models with fixed-effects

This paper develops an asymptotic theory for test statistics in linear panel models that are robust to heteroskedasticity, autocorrelation and/or spatial correlation. Two classes of standard errors are analyzed. Both are based on nonparametric heteroskedasticity autocorrelation (HAC) covariance matrix estimators. The first class is based on averages of HAC estimators across individuals in the cross-section, i.e. “averages of HACs”. This class includes the well known cluster standard errors analyzed by Arellano (1987) as a special case. The second class is based on the HAC of cross-section averages and was proposed by Driscoll and Kraay (1998). The ”HAC of averages” standard errors are robust to heteroskedasticity, serial correlation and spatial correlation but weak dependence in the time dimension is required. The “averages of HACs” standard errors are robust to heteroskedasticity and serial correlation including the nonstationary case but they are not valid in the presence of spatial correlation. The main contribution of the paper is to develop a fixed-b asymptotic theory for statistics based on both classes of standard errors in models with individual and possibly time fixed-effects dummy variables. The asymptotics is carried out for large time sample sizes for both fixed and large cross-section sample sizes. Extensive simulations show that the fixed-b approximation is usually much better than the traditional normal or chi-square approximation especially for the Driscoll-Kraay standard errors. The use of fixed-b critical values will lead to more reliable inference in practice especially for tests of joint hypotheses.     

再开票中心——国际营运资金管理的有效途径

跨国公司依据总体战略目标的需要,设立再开票中心进行双边或多边冲销,可以达到方便债权债务结算、减轻公司整体税负、加速内部资金融通并降低资金转移费用,避免外汇风险的显著财务效应,使得再开票中心成为国际营运资金管理的有效途径。     

Run length distributions for estimated attributes charts

Attributes control charts, such as c and p charts, are popular methods for detecting out of control signals when it is practical only to obtain qualitative information about a process; in such cases, variables control charts, such as the , s and R charts, cannot be used. The run length distributions have previously been studied for variables charts when the control limits have been estimated. Little has been done in the case of attributes charts. In this paper, the run length distributions for the c chart and p chart are derived for the case when the control limits are estimated. It is shown that, as for variables charts, the effect of estimation on quantities such as the average run length (ARL) can be quite dramatic, but when the underlying process is in control, the ARL is potentially misleading as a basis for comparison. Received: September 1998     

探寻中国古典舞蹈之奥义

中国古典舞蕴涵了丰富而深厚的历史意义,无论是在舞蹈形态上还是在意象意境的塑造上都是极其令人深思的。本文试从中华和谐美第一图———太极图,对中国古典舞的美学意蕴进行探源与理性思考。     

关于W_m·K_n的边色数和全色数

设有一点u和m个Kn的联图为Wm·Kn,则有V(W m·K n)={u}∪{v i 1,vi 2,,vi n|i=1,2,,m}E(W m·K n)={u vi 1|i=1,2,,m}∪{v 1 1v 2 1,v2 1v 3 1,,v(m1)1v m 1,vm 1v 11}∪{v i j vi k|i=1,2,,m;j=1,2,,n-1;k=j+1,j+2,,n}.本文主要研究了Wm·Kn的正常边染色、邻点可区别边染色和全染色系列染色问题,并分别得到了相应的色数。     

Deconstructing the information era

Information theory, while claiming universality, ignores civilisation and spiritual perspectives of knowledge. Moreover, the information society heralded by many as the victory of humanity over darkness is merely capitalism disguised but now commodifying selves as well. This essay argues for a more communicative approach wherein futures can be created through authentic global conversations--a gaia of civilisations. Current trends, however, do not lie in that direction. Instead, we are moving towards temporal and cultural impoverishment. Is the Web then the iron cage or can a global ohana (family, civil society) be created through cybertechnologies? Answering these and other questions are possible only when we move to layers of analysis outside conventional understandings of information and the information era and to a paradigm where communication and culture are central.     

一种奖罚管理模型M(a,b,c,d,R,P)的研究

企业奖罚管理模型的使用可以产生异乎寻常的管理效果。“M（a，b，c，d，R，P）”管理模型的含义是：如果项目承担人没有项目咨询师的帮助，那么他完成了该项目工作将受到数量为R的奖励，否则他将受到数量为P的惩罚：如果项目承担人在项目咨询师的帮助下完成了该项目工作，那么帮助他的项目咨询师将受到数量为aR的奖励．而项目承担人自己仅受到数量为bR的奖励；如果项目承担人在项目咨询师的帮助下没有完成该项目工作，那么项目咨询师将受到数量为cP的惩罚，而项目承担人自己却受到数量为dP的惩罚。