cancellation在数学中的意思

英语翻译
Where “N” is the week number in which the cancellation notice is provided.
Supplier must usual good faith efforts to dispose of any Materials prior to seeking compensation under this section.For any rescheduled orders that are later cancelled,the original requested delivery date will apply for determining liability under this section.

急!求英文原文论文及翻译~
题目为An Active Circuit for Cancellation of Common-Mode Voltage Generated by a PWM,原文和翻译都要~

please do NOT include as laibility of the cancellation.Please keep these usual materials for future orders.

英译汉:Excellent voice quality with echo cancellation and digital Voice Privacy
帮忙翻译成中文.

I should mention that there is a cancellation charge of $20
订酒店时,酒店人员说的这句话是什么意思?翻译说：我应该指出,有一个取消收费20元.还有别的翻译吗?

英语翻译
This property has a 1 day cancellation policy.
Failure to cancel within this time will result in a cancellation charge equal to the first night of your stay.

英语翻译
Group birefringence cancellation in highly
birefringent photonic crystal fibre at
telecommunication wavelengths.The spectral dependence of the group modal birefringence in a highly
birefringent nonlinear photonic crystal fibre is studied both numerically
and experimentally.The sign inversion and the cancellation of the
group modal birefringence in the telecommunication window is
demonstrated.Two simple experimental techniques are used to evaluate
the wavelength of zero polarisation mode dispersion.The experimental
results are in excellent agreement with numerical calculations based on
vectorial beam propagation method simulations.
Introduction:Since their emergence in the past decade,photonic crystal
fibres (PCFs) have stimulated major progress in linear and nonlinear
guided optics by offering outstanding flexibility in the design of
the group-velocity dispersion and nonlinear characteristics [1].
Birefringence properties can also be precisely tailored and extremely
high built-in birefringence has been reported by breaking the standard
perfect sixfold symmetric core and cladding structure [1].Such polarisation-
maintaining (PM) PCFs have been decisive for several fibre-based
applications such as lasers,interferometers and supercontinuum sources
[2–4].However,several researchers have stressed that the induced form
birefringence characteristics in such PCFs may exhibit a strong wavelength
dependence [5],leading to significant variations of the group
modal birefringence over a short wavelength range.Recently,
Martynkien et al.have also demonstrated that group birefringence can
cross zero value near 880 nm in highly birefringent (HiBi) microstructured
fibre with elliptical GeO2 doped inclusion in the core [6].In
addition,numerical investigations have shown that complex PCFs
with composite form and stress birefringence are convenient to
manage the wavelength dependence of both phase and group birefringences
[7].
希望不要直接用在线翻译，因为根本读不通