无线安全中间件的研究与设计

文章在分析无线网络安全现状的基础上，基于中间件整合平台的思路，提出了一个适应性强的无线安全中间件的设计方案。该中间件主要基于证书服务和密码服务，文章具体阐述了这两大模块的实现及特点．对无线网络安全的实施具有实践意义。     

现行日本高中化学教材插图特点分析及启示*

日本数研出版(2018年版)的高中化学教材在插图设计方面有许多独到之处,实现了从“教材”向“学材”转变的插图设计理念。综合现有对教材插图科学性的研究,采用文本分析法从图文排版、插图的表现形式、图文融合程度、插图素材选取以及用插图进行多维度信息整合等5个维度对书中插图进行分析,并对我国教材插图的编写提供参考性意见。     

日本电信市场综述

主要介绍了日本无线通信、海底电缆、卫星通信、电缆电视以及因特网的研发和市场现状,并指出日本电信市场的发展趋势是:非电信公司逐步深入电信领域;电子商务和移动商务将快速发展;广播电视与因特网业务趋向融合;高速接入业务呈现强劲的增势;不断放松管制和强调竞争。     

中日汽车尾气排放数据分析及其尾气防治法律制度比较探究--以北京市为例

今年初春,北京等地雾霾污染天气不断出现,PM2.5成为人们关注的一个数据,而PM2.5产生的主要来源就是汽车尾气排放。汽车尾气成为空气污染的主要因素,加强汽车尾气排放控制和治理刻不容缓。日本作为环保楷模,其对大气污染的应对措施及治理经验对中国将有所启发。本文将在对比研究日本与北京市汽车尾气污染防治法律制度的基础上,提出今后完善北京市汽车尾气污染控制的立法建议。     

In vitro fertilization in Japan — Early days of in vitro fertilization and embryo transfer and future prospects for assisted reproductive technology —

Assisted reproductive technology (ART) such as in vitro fertilization (IVF) and embryo transfer (ET) has been essential in the treatment of infertility. The world’s first IVF-ET baby was born in 1978 based on the technique developed by Dr. Robert Edwards and Dr. Patrick Steptoe.¹⁾ In Japan, the first IVF-ET birth was reported in 1983 by Prof. Masakuni Suzuki at Tohoku University School of Medicine.^2,3)IVF-ET is a procedure used to achieve pregnancy that consists of extracting oocytes from an infertile woman, fertilizing them in vitro, and transferring fertilized eggs into the patient’s uterine cavity (Fig. ​(Fig.1).1). Since the first report of successful IVF-ET, numerous techniques related to ART, such as cryopreservation of oocytes and embryos, gamete intrafallopian transfer (GIFT), and microinsemination, have been developed and refined (Table ​(Table11).Open in a separate windowFigure 1. In vitro fertilization and embryo transfer process. A: Induction of ovulation: After menstruation, ovulation is induced to produce multiple oocytes. B: Testing: 1. Follicular diameter is measured using ultrasound. 2. Blood estradiol (E₂) levels are measured. 3. Oocyte maturity is assessed with urinary Luteinizing Hormone (LH) measurements. C: Oocyte retrieval: Ultrasound-guided transvaginal follicle puncture is used to collect oocytes. D: Semen collection: Semen is collected from the husband. E: Sperm preparation: Semen is separated into multiple layers on a thickener effluent, and separated using a centrifuge. (400 × g, 30 min). F: Insemination: The semen and oocytes are placed together in a dish with culture media. G: Confirmation of fertilization: Fertilization is confirmed on the first day after oocyte retrieval. H: Embryo transfer: On the third or fifth day after oocyte retrieval, fertilized eggs are transferred to the uterus through a catheter.

Table 1.

Timeline of reproductive technologies in Japan

Cobalt-catalyzed hydrocyanation and hydroarylation of enamines

A mild, general and efficient hydrocyanation and hydroarylation of enamines catalyzed by Co(salen) complexes are described. Both reactions include regioselective CH bond formation of enamines, and the corresponding products are obtained in high yield. Hydroarylation critically discriminates the benzyl and benzoyl aromatic rings on nitrogen in cyclization step, and the corresponding isoindolinones including quaternary carbons are exclusively given.     

WPKI模型和实施方法探讨

各种无线网络正得到迅速推广使用,但它存在着严重的安全隐患。本文基于无线环境下的安全解决方案,论述了无线公钥基础设施(WPKI)的模型和无线传输层安全协议(WTLS)的组成,并对WPKI实施方法进行了探讨。     

Fusopoltides B–E,new polyketides isolated from Fusarium solani B-18

Four new polyketides, fusopoltides B–E, were isolated, along with four known compounds, from Fusarium solani B-18 cultured on brown-rice. Fusopoltide B is a diastereomer of its co-isolated known compound, fusopoltide A, featuring a pentaleno[1,2-c]pyran ring system. Fusopoltide C and fusopoltides D–E are incorporated the first natural polyketides featured decahydro-pentaleno[1,2-c]pyran and pentaleno[1,2-c]furan ring systems, respectively. The structural assignments were established using comprehensive spectroscopic techniques, the modified Mosher's ester method, and electronic circular dichroism (ECD) calculations.     

Esr studies on the reactive character of the radical anions,so−2, so−3 and so−4 in aqueous solution

The reactive characteristics of the oxy anion radicals of sulphur, SO^?₂, SO^?₃ and SO^?₄ were investigated by use of the rapid-mixing flow technique coupled with electron spin resonance (ESR) which can detect the radicals having a lifetime of 5–100 msec. The SO^?₂ reduced the aromatic nitro compounds to the corresponding anion radicals, but did not abstract the hydrogen from the saturated compounds nor add to the unsaturated compounds. The SO^?₃ could add to the compounds having CC bond, but did not abstract the hydrogen from the saturated compounds nor reduce the aromatic nitro compounds. The SO^?₄ could abstract the hydrogen from the saturated compounds and also add to the unsaturated compounds having CC bond, but did not reduce the aromatic nitro compounds. These differences of the reactivity towards the organic substrates were discussed on the basis of the difference in the distribution of the unpaired electron density of each radical anion.     

Synthesis of arnebinol,an ansa-type prenylated phenol with effects inhibitory to prostaglandin biosynthesis

Arnebinol, a new ansa-type prenylated phenol, was synthesized in 12 steps from geraniol and p-benzoquinone in 5.1 % overall yield.