Recursive constructions for cyclic block designs

Simple recursive constructions for cyclic block designs are given. These yield many new infinite families of cyclic Steiner 2-designs.     

Practical problems associated with programme evaluation in third world countries

Problems in conducting programme evaluation in third world countries can be divided into four interrelated categories: those associated with design, personnel, time, and budget. Some of the problems in each of these areas are considered and suggestions for dealing with them are presented.     

响应面法优化固定化荧光假单胞菌磷脂酶B的研究

以脱胶油磷含量为响应值,采用响应面法和Central-Composite设计对制备固定化荧光假单胞菌磷脂酶B(PfPLB)主要工艺参数(海藻酸钠浓度、壳聚糖浓度和加酶量)进行了优化,并且采用回归分析拟合了三个固定化因子与响应值(磷含量)的回归模型.该模型预测最佳的固定化Pf-PLB条件为:海藻酸钠3%,壳聚糖1.14%,加酶量1000 U/kg.研究固定化Pf-PLB的酶学性质,结果表明其最适反应温度为40℃,比游离酶提高15℃;最适反应pH为5.5,比游离酶降低1个pH单位.固定化Pf-PLB具有较好的酶活稳定性,连续反应6次,其相对活性为初始值的51.6%,显示出良好的应用前景.     

Gertrude Stein,Opium Queen: Notes on a Mistaken Embrace

Gertrude Stein was not only a fairly open lesbian but also Jewish, expatriate, and androgynous—all attributes that often retarded mass-market success. Why then was she so popular? The article offers original research highlighting how Stein was constructed as a kind of “opium queen” in the popular American press, and the ways that this decadent, bohemian celebrity persona allowed her to operate as “broadly queer” rather than “specifically gay” in the American cultural imaginary—a negotiation that accounts for the mass-market success rather than censure of The Autobiography of Alice B. Toklas despite the unparalleled visibility of its lesbian erotics.     

B／S架构应用下英语专业论文写作模式探究

以传统论文写作模式为切入点,对比研究B／S架构技术应用下的英语专业论文写作模式发展优势及应用劣势,同时对论文传统模式与论文智能管理模式的应用融合方面进行深入研究,提出“电子学生”、“哈西方化”、“非英不汉”等研究词汇,为提高英语专业论文写作质量提供参考。     

农村连锁超市新型运营模式研究

当前我国发展农村连锁超市的条件更加成熟,发展农村连锁超市的意义也更加凸显.然而,在最初解决城市剩余工业品和落实扩大内需政策主导下成立起来的农村连锁超市在运营模式上不可避免地存在不能满足农村实际需要、配送和经营成本高、利润空间有限、难以做大做强的缺陷.而新型“一网双流、双向赢利”及改进升级后的“一网双流、双向赢利、B2B”农村连锁超市新型运营模式与农村地区市场规律相结合,很好地弥补了现行运营模式的缺陷,并能同时实现多赢.通过建立强有力的农村连锁超市龙头企业、科学合理选址布店、建立电子商务平台和提升加盟店计算机应用水平是农村连锁超市新型运营模式做大做强的重要保证.     

基于三角网格模型的多分辨率B样条曲面重建

利用三角网格参数化技术,对三角网格进行重新采样,将三角网格模型转化成四角网格模型,然后用B样条曲面插值四角网格模型。通过调整四角网格模型的分辨率,就可获得一系列不同分辨率的B样条曲面,并且容易计算出B样条曲面与三角网格模型的误差。最后通过实例证明了文中算法的有效性。     

社会重构：战后以来美国改革浪潮的特点与启示

战后从肯尼迪到奥巴马的持续性改革是20世纪初进步主义改革和30年代新政改革以来美国的第三次改革浪潮。这一改革浪潮主要由“伟大社会”改革、持续性教育改革和奥巴马的医保改革构成。在社会不同利益群体阅实现公平与正义是改革不变的主题。改革的结果是有力地推动了美国社会的重构,在种族、性别、环境等领域长期存在的矛盾与冲突得到了有效缓和,社会和谐度明显增强。战后美国改革的社会建设功能对今日中国进一步改革与发展具有重要的启迪作用。     

Contractors’ and Agency Decisions and Policy Implications in A+B Bidding

The focus of this study is on the A+B transportation procurement mechanism, which uses the proposed cost (A component) and the proposed time (B component) to score contractors’ bids. Empirical studies have shown that this mechanism shortens project durations. We use normative models to study the effect of certain discretionary parameters set by state transportation agencies on contractors’ equilibrium bidding strategies, winner selection, and actual completion times. We model the bidding environment in detail including multi‐dimensional bids, contractors’ uncertainty about completion times, and reputation cost. The latter refers to a private penalty that accrues to tardy contractors from increased cost of posting bonds and reduced prospects of winning future projects. Our model explains why contractors may skew line‐item bids and why winners frequently finish earlier than bid. It has several policy implications as well. For example, we recommend that agencies set the daily incentive, disincentive, and road user cost to be equal and not cap incentives. This is a departure from current practice, where incentives are often capped and weaker than penalties. Furthermore, we show that agencies may be justified in setting daily road user cost strictly smaller than the true cost of traffic disruption during construction.     

W.E.B. Du Bois and the ideology or anthropological discourse of modernity: the African Union reconsidered

Pan-Africanism is usually considered a progressive movement for black socio-political and economic advancement. This focus on activism alone sometimes occludes the profound philosophical issues that inform Pan-Africanist discourse. The last decade has witnessed tremendous changes in the ideological posture of the African Union (AU) as reflected in the change of name from the Organization of African Unity (OAU). This paper explores the historical and philosophical contexts for understanding the agenda of the African Union and highlights the consequences of such an agenda. The paper argues that the establishment of the African Union conforms to certain aspects of W.E.B. Du Bois's philosophy of Pan-Africanism that focuses on economic self reliance, at the same time that it uses Du Bois as a template for critiquing the neoliberal economic dispensation of the African Union implemented through its program, the New Partnership for Africa's Development. This it accomplishes with its emphasis on Du Bois's critique and skepticism of modernism and Western philanthropy.