两性离子聚合物BY－1及其钻井液体系

两性离子聚合物ＢＹ－１是以含阴、阳、非离子基团的乙烯基或丙烯基单体为原料合成的多元共聚物。本文报导了ＢＹ－１的抑制性、在钻井液中的配伍性和抗温、抗污染性能，简要介绍了ＢＹ－１钻井液的现场试验情况。结果表明，ＢＹ－１能抑制岩屑水化分散，在钻井液中具有良好的配伍性和较强的抗盐、钙污染能力。     

Feline bone marrow transplantation: its use in FIV-infected cats

The use of autologous and allogenic bone marrow transplantations (BMT) in FIV-infected and uninfected cats is a novel therapy for feline hematopoietic diseases and retroviral infections. A total of 13 specific pathogen-free (SPF) cats received either autologous or allogenic BMT and seven of these cats were also infected with FIV before autologous or allogenic BMT. All BMT recipients received total body irradiation of 900 cGy just before BMT. Two FIV-infected and four uninfected cats received autologous uninfected BM cells cryopreserved before BMT. Five infected and two uninfected cats received BM cells from allogenic uninfected donors (RBC-, MHC-, and cross-matched). MHC-matching was based on mixed leucocyte reaction (MLR) and the donor-recipient combination which was compatible by MLR analysis, was used in this study. Recipients were monitored for hematology, immunology, virology, and clinical signs. All FIV-infected and uninfected recipients of autologous BMT had complete engraftment with minimal complications. Uninfected recipients of allogenic BMT had a more severe clinical episode with slower rate of engraftment. None of these BMT groups had mortality. In contrast, only two of the five infected recipients of allogenic BMT survived for a significant period of time (23 and 50 weeks) and rest of the cats succumbed to transfusion reactions. Both infected BMT groups had persistent CD4/CD8 inversion, low CD4+ cell counts, and FIV infection of engrafted peripheral blood mononuclear cells (PBMC). Overall, successful autologous and allogenic BMTs were performed in FIV-free cats. All infected recipients of autologous BMT had compete engraftment and are currently alive, with thelongest survival time being over 1 year. Thus, BMT in combination with antiviral drug therapies may be an alternative therapy against retroviral infection.     

超薄窗Si（Li）探测器在实验中的应用

用超薄窗Ｓｉ（Ｌｉ）探测器测量低能Ｘ射线，将传统的ＰＩＸＥ谱测量范围推广到如Ｓｉ、Ａｌ、Ｎａ等低原子序数元素。还对超薄窗Ｓｉ（Ｌｉ）探测器的具体应用作了描述。     

RCS SCALE-MODEL-TESTING METHOD BY VARIANCE IN THE SIZE FOR SIMPLY SHAPED SCATTERERS

t According to a general representation of physical scale factor of RCS for variance in the size of simply shaped scatterers, a novel RCS model-testing method is described. The computed results of the prototype scatterers by this method from the model-testing agree well with their measured values both for two kinds of simply shaped scatterers, cylinders and ladder-shaped plates.     

Divergence control for distributed database systems

This paper presents distributed divergence control algorithms for epsilon serializability for both homogeneous and heterogeneous distributed databases. Epsilon serializability allows for more concurrency by permitting non-serializable interleavings of database operations among epsilon transactions. We first present a strict 2-phase locking divergence control algorithm and an optimistic divergence control algorithm for a homogeneous distributed database system, where the local orderings of all the sub-transactions of a distributed epsilon transaction are the same. In such an environment, the total inconsistency of a distributed epsilon transaction is simply the sum of those of all its sub-transactions. We then describe a divergence control algorithm for a heterogeneous distributed database system, where the local orderings of all the sub-transactions of a distributed epsilon transaction may not be the same and the total inconsistency of a distributed epsilon transaction may be greater than the sum of those of all its sub-transactions. As a result, in addition to executing a local divergence control algorithm in each site to maintain the local inconsistency, a global mechanism is needed to take into account the additional inconsistency Recommended by: Meichum Hsu     

低碳低合金钢的热延性及表面裂纹

本文介绍近年来有关低碳低合金钢的热延性、与热延性相关的表面裂纹以及裂纹形成机制等方面的研究结果。     

Photoinitiated crosslinking of low density polyethylene: II. Morphology and properties

The crystalline morphology and physical properties of photocrosslinked polyethylene in a low density polyethylene (LDPE)-benzophenone (BP)-triallyl isocyanurate (TAIC) system have been studied. The results of X-ray diffraction and DSC thermal analysis indicate that the effect of crosslinking on the degree of crystallinity of the material is quite limited, but the presence of crosslinks can affect the regularity of the crystal regions. This is proposed to be responsible for the slight variation in properties of the crosslinked material at room temperature, such as the decrease of modulus and the changes of yield behavior. The main improvements in properties of the photocrosslinked polyethylene are found at high temperatures, especially above the melting point. The strength is increased, and the heat distortion temperature is enhanced significantly, as previously reported in the literature.     

塑钢窗的质量问题及行业管理

塑钢窗以其优良的耐久性、保温性及低廉价格被广泛使用。由于对制作安装标准掌握不好,塑钢窗的质量存在诸多问题,本文简述这些问题,并从行业管理角度提出见解。